omena_transform_target/

lib.rs

//! Target feature matrix planning for Omena CSS transforms.
//!
//! This crate owns the target-sensitive lowering decision boundary. It
//! resolves standard browserslist queries through an embedded Can I Use snapshot,
//! then folds the resolved browser set into the explicit Omena transform feature
//! matrix. Named profiles stay available for product defaults and conservative
//! non-browser environments.

use std::{
    collections::{BTreeMap, BTreeSet},
    sync::OnceLock,
};

use browserslist::{Distrib, Opts, resolve as resolve_browserslist};
use omena_transform_cst::{TransformPassKind, transform_pass_sort_ordinal};
use omena_transform_passes::{
    TransformPassPlanV0, TransformVendorPrefixPolicyV0, plan_transform_passes,
};
use serde::{Deserialize, Serialize};

const BROWSER_THRESHOLDS_SOURCE: &str = include_str!("../data/browser-thresholds.toml");
const PASS_FEATURE_BINDINGS_SOURCE: &str = include_str!("../data/pass-feature-bindings.toml");
const NATIVE_STAGE2_COVERAGE_SOURCE: &str = include_str!("../data/native-stage2-coverage.json");
const TARGET_DATA_CONTRACT_ID: &str = "omena-transform-target-data-v0";
const TARGET_DATA_SOURCE_FILES: &[&str] = &[
    "data/compat-feature-selections.json",
    "data/browser-thresholds.toml",
    "data/pass-feature-bindings.toml",
    "data/native-stage2-coverage.json",
];
const COMPAT_QUORUM_SOURCES: &[&str] = &["caniuse", "web-features", "mdn-bcd"];
const CANIUSE_RESOLVER_WORKSPACE_DEPENDENCY: &str = "browserslist";
const CANIUSE_RESOLVER_CARGO_PACKAGE: &str = "oxc-browserslist";
const THRESHOLD_SOURCE_POLICY: &str = "mdnFullUnprefixedResolverCoveredV0";
const VENDOR_PREFIX_MATRIX_SOURCE: &str = "curatedVendorPrefixMatrixTomlV0";
const RUNTIME_FALLBACK_FEATURE_KEYS: &[&str] = &[];

#[derive(Debug, Clone, PartialEq, Eq, Default)]
struct BrowserThresholdDataV0 {
    schema_version: String,
    product: String,
    refreshed_at: String,
    threshold_source_policy: String,
    quorum_min_sources: usize,
    caniuse_resolver_workspace_dependency: String,
    caniuse_resolver_cargo_package: String,
    caniuse_resolver_cargo_version: String,
    thresholds: Vec<BrowserFeatureThresholdV0>,
    parse_error_count: usize,
}

#[derive(Debug, Clone, PartialEq, Eq, Default)]
struct BrowserFeatureThresholdV0 {
    table: String,
    browser: String,
    min_major: u16,
    min_minor: u16,
    caniuse_key: String,
    source_quorum: Vec<String>,
    last_verified: String,
}

#[derive(Debug, Clone, PartialEq, Eq, Default)]
struct PassFeatureBindingDataV0 {
    schema_version: String,
    product: String,
    refreshed_at: String,
    caniuse_resolver_workspace_dependency: String,
    caniuse_resolver_cargo_package: String,
    caniuse_resolver_cargo_version: String,
    bindings: Vec<PassFeatureBindingV0>,
    parse_error_count: usize,
}

#[derive(Debug, Clone, PartialEq, Eq, Default)]
struct PassFeatureBindingV0 {
    pass_id: String,
    caniuse_keys: Vec<String>,
    support_table: String,
}

#[derive(Debug, Clone, Copy, PartialEq, Eq, Deserialize, Serialize)]
#[serde(rename_all = "camelCase")]
pub struct TargetFeatureSupportV0 {
    pub vendor_prefix_required: bool,
    pub supports_light_dark: bool,
    pub supports_color_mix: bool,
    pub supports_oklch_oklab: bool,
    pub supports_color_function: bool,
    pub supports_relative_color: bool,
    pub supports_logical_properties: bool,
    pub supports_css_nesting: bool,
    pub supports_css_scope: bool,
    pub supports_cascade_layers: bool,
}

#[derive(Debug, Clone, Copy, PartialEq, Eq, Deserialize, Serialize)]
#[serde(rename_all = "camelCase")]
#[serde(default)]
pub struct TargetTransformOptionsV0 {
    pub allow_logical_to_physical: bool,
    pub allow_scope_flatten: bool,
    pub allow_layer_flatten: bool,
    pub enable_supports_static_eval: bool,
    pub enable_media_static_eval: bool,
    pub enable_container_static_eval: bool,
    pub drop_dark_mode_media_queries: bool,
}

impl Default for TargetTransformOptionsV0 {
    fn default() -> Self {
        conservative_target_options()
    }
}

#[derive(Debug, Clone, PartialEq, Eq, Serialize)]
#[serde(rename_all = "camelCase")]
pub struct TransformTargetDataContractV0 {
    pub product: &'static str,
    pub contract_id: &'static str,
    pub snapshot_id: String,
    pub browser_threshold_schema_version: String,
    pub pass_feature_binding_schema_version: String,
    pub browser_threshold_refreshed_at: String,
    pub pass_feature_binding_refreshed_at: String,
    pub threshold_source_policy: String,
    pub caniuse_resolver_workspace_dependency: String,
    pub caniuse_resolver_cargo_package: String,
    pub caniuse_resolver_cargo_version: String,
    pub source_files: Vec<&'static str>,
    pub parse_error_count: usize,
    pub quorum_min_sources: usize,
    pub browser_threshold_table_count: usize,
    pub browser_threshold_entry_count: usize,
    pub pass_feature_binding_count: usize,
    pub stale_entry_count: usize,
    pub unmapped_threshold_table_count: usize,
    pub unresolvable_threshold_query_count: usize,
    pub runtime_fallback_feature_keys: Vec<&'static str>,
    pub runtime_fallback_feature_count: usize,
    pub generated_coverage_complete: bool,
    pub quorum_valid: bool,
    pub bindings_valid: bool,
    pub resolver_provenance_valid: bool,
    pub valid: bool,
}

#[derive(Debug, Clone, PartialEq, Eq, Serialize)]
#[serde(rename_all = "camelCase")]
pub struct TransformTargetDataEvidenceV0 {
    pub product: &'static str,
    pub pass_id: String,
    pub support_table: String,
    pub caniuse_keys: Vec<String>,
    pub source_quorum: Vec<String>,
    pub last_verified: Vec<String>,
    pub resolved_targets: Vec<TransformTargetResolvedTargetEvidenceV0>,
    pub all_resolved_targets_supported: bool,
}

#[derive(Debug, Clone, PartialEq, Eq, Serialize)]
#[serde(rename_all = "camelCase")]
pub struct TransformTargetResolvedTargetEvidenceV0 {
    pub browser: String,
    pub version: String,
    pub supported: bool,
    pub matched_threshold: Option<TransformTargetThresholdEvidenceV0>,
}

#[derive(Debug, Clone, PartialEq, Eq, Serialize)]
#[serde(rename_all = "camelCase")]
pub struct TransformTargetThresholdEvidenceV0 {
    pub browser: String,
    pub min_version: String,
    pub caniuse_key: String,
    pub source_quorum: Vec<String>,
    pub last_verified: String,
}

#[derive(Debug, Clone, PartialEq, Eq, Serialize)]
#[serde(rename_all = "camelCase")]
pub struct TransformTargetBoundarySummaryV0 {
    pub schema_version: &'static str,
    pub product: &'static str,
    pub managed_pass_ids: Vec<&'static str>,
    pub opt_in_pass_ids: Vec<&'static str>,
    pub target_data_source: &'static str,
    pub planner_surface: &'static str,
    pub browser_threshold_table_count: usize,
    pub browser_threshold_entry_count: usize,
    pub pass_feature_binding_count: usize,
    pub browser_data_source_files: Vec<&'static str>,
    pub browser_data_parse_error_count: usize,
    pub browser_data_quorum_valid: bool,
    pub browser_data_bindings_valid: bool,
    pub target_data_contract: TransformTargetDataContractV0,
    pub vendor_prefix_matrix_source: &'static str,
    pub runtime_fallback_feature_keys: Vec<&'static str>,
    pub generated_coverage_complete: bool,
    pub native_stage2_coverage: NativeStage2CoverageSummaryV0,
}

#[derive(Debug, Clone, PartialEq, Eq, Deserialize, Serialize)]
#[serde(rename_all = "camelCase")]
pub struct NativeStage2CoverageFallbackV0 {
    pub plugin_id: String,
    pub policy: String,
}

#[derive(Debug, Clone, PartialEq, Eq, Deserialize, Serialize)]
#[serde(rename_all = "camelCase")]
pub struct NativeStage2CoveredFeatureV0 {
    pub feature_id: String,
    pub category: String,
    pub pass_ids: Vec<String>,
    pub target_rule: String,
    pub caniuse_keys: Vec<String>,
    pub source_keys: BTreeMap<String, String>,
    pub status: String,
}

#[derive(Debug, Clone, PartialEq, Eq, Deserialize, Serialize)]
#[serde(rename_all = "camelCase")]
pub struct NativeStage2UncoveredFeatureV0 {
    pub feature_id: String,
    pub category: String,
    pub reason: String,
    pub observed_properties: Vec<String>,
    pub fallback: String,
}

#[derive(Debug, Clone, PartialEq, Eq, Deserialize, Serialize)]
#[serde(rename_all = "camelCase")]
struct NativeStage2CoverageDataV0 {
    schema_version: String,
    product: String,
    binding_source: String,
    selection_basis: Vec<String>,
    stage1_fallback: NativeStage2CoverageFallbackV0,
    covered_features: Vec<NativeStage2CoveredFeatureV0>,
    uncovered_features: Vec<NativeStage2UncoveredFeatureV0>,
}

#[derive(Debug, Clone, PartialEq, Eq, Serialize)]
#[serde(rename_all = "camelCase")]
pub struct NativeStage2CoverageSummaryV0 {
    pub schema_version: String,
    pub product: String,
    pub binding_source: String,
    pub selection_basis: Vec<String>,
    pub stage1_fallback: NativeStage2CoverageFallbackV0,
    pub covered_features: Vec<NativeStage2CoveredFeatureV0>,
    pub uncovered_features: Vec<NativeStage2UncoveredFeatureV0>,
    pub covered_feature_count: usize,
    pub uncovered_feature_count: usize,
    pub covered_pass_census_valid: bool,
    pub binding_census_valid: bool,
    pub valid: bool,
}

#[derive(Debug, Clone, PartialEq, Eq, Serialize)]
#[serde(rename_all = "camelCase")]
pub struct TransformTargetQueryPlanV0 {
    pub schema_version: &'static str,
    pub product: &'static str,
    pub query: String,
    pub normalized_query: String,
    pub profile_id: &'static str,
    pub recognized_profile: bool,
    pub target_data_source: &'static str,
    pub target_data_contract_id: &'static str,
    pub target_data_snapshot_id: String,
    pub target_data_evidence: Vec<TransformTargetDataEvidenceV0>,
    pub vendor_prefix_matrix_source: &'static str,
    pub vendor_prefix_policy: Option<TransformVendorPrefixPolicyV0>,
    pub resolved_targets: Vec<String>,
    pub resolution_error: Option<String>,
    pub support: TargetFeatureSupportV0,
    pub transform_plan: TransformTargetPlanV0,
    pub native_stage2_coverage: NativeStage2CoverageSummaryV0,
}

#[derive(Debug, Clone, PartialEq, Eq, Serialize)]
#[serde(rename_all = "camelCase")]
pub struct TransformTargetPlanV0 {
    pub schema_version: &'static str,
    pub product: &'static str,
    pub target_label: String,
    pub required_pass_ids: Vec<&'static str>,
    pub blocked_pass_ids: Vec<&'static str>,
    pub planned_pass_ids: Vec<&'static str>,
    pub pass_plan: TransformPassPlanV0,
}

pub fn summarize_omena_transform_target_boundary() -> TransformTargetBoundarySummaryV0 {
    let browser_data = browser_threshold_data();
    let bindings = pass_feature_binding_data();
    let target_data_contract = target_data_contract_summary(browser_data, bindings);

    TransformTargetBoundarySummaryV0 {
        schema_version: "0",
        product: "omena-transform-target.boundary",
        managed_pass_ids: target_managed_passes()
            .iter()
            .map(|pass| pass.id())
            .collect(),
        opt_in_pass_ids: vec![
            TransformPassKind::LogicalToPhysical.id(),
            TransformPassKind::ScopeFlatten.id(),
            TransformPassKind::LayerFlatten.id(),
        ],
        target_data_source: "oxcBrowserslistV3+browserThresholdsTomlV0+staticTargetProfileV0+generatedFeatureMatrixV0",
        planner_surface: "omena-transform-passes.plan",
        browser_threshold_table_count: browser_threshold_table_count(browser_data),
        browser_threshold_entry_count: browser_data.thresholds.len(),
        pass_feature_binding_count: bindings.bindings.len(),
        browser_data_source_files: target_data_source_files(),
        browser_data_parse_error_count: browser_data.parse_error_count + bindings.parse_error_count,
        browser_data_quorum_valid: browser_threshold_data_is_valid(browser_data),
        browser_data_bindings_valid: pass_feature_binding_data_is_valid(browser_data, bindings),
        target_data_contract,
        vendor_prefix_matrix_source: VENDOR_PREFIX_MATRIX_SOURCE,
        runtime_fallback_feature_keys: runtime_fallback_feature_keys(),
        generated_coverage_complete: runtime_fallback_feature_keys().is_empty(),
        native_stage2_coverage: summarize_native_stage2_coverage(),
    }
}

pub fn summarize_native_stage2_coverage() -> NativeStage2CoverageSummaryV0 {
    let data = native_stage2_coverage_data();
    let implemented_pass_ids = omena_transform_passes::implemented_mutation_pass_ids()
        .into_iter()
        .collect::<BTreeSet<_>>();
    let binding_pairs = pass_feature_binding_data()
        .bindings
        .iter()
        .map(|binding| (binding.pass_id.as_str(), binding.support_table.as_str()))
        .collect::<BTreeSet<_>>();
    let covered_pass_census_valid = data.covered_features.iter().all(|feature| {
        feature
            .pass_ids
            .iter()
            .all(|pass_id| implemented_pass_ids.contains(pass_id.as_str()))
    });
    let binding_census_valid = data.covered_features.iter().all(|feature| {
        let Some(support_table) = feature.target_rule.strip_prefix("allResolvedTargetsMeet:")
        else {
            return false;
        };
        feature
            .pass_ids
            .iter()
            .all(|pass_id| binding_pairs.contains(&(pass_id.as_str(), support_table)))
    });
    let valid = data.schema_version == "0"
        && data.product == "omena-transform-target.native-stage2-coverage"
        && !data.covered_features.is_empty()
        && !data.uncovered_features.is_empty()
        && data
            .uncovered_features
            .iter()
            .all(|feature| feature.fallback == "stage1")
        && covered_pass_census_valid
        && binding_census_valid;

    NativeStage2CoverageSummaryV0 {
        schema_version: data.schema_version.clone(),
        product: data.product.clone(),
        binding_source: data.binding_source.clone(),
        selection_basis: data.selection_basis.clone(),
        stage1_fallback: data.stage1_fallback.clone(),
        covered_features: data.covered_features.clone(),
        uncovered_features: data.uncovered_features.clone(),
        covered_feature_count: data.covered_features.len(),
        uncovered_feature_count: data.uncovered_features.len(),
        covered_pass_census_valid,
        binding_census_valid,
        valid,
    }
}

pub fn plan_target_transforms_from_query(
    query: impl Into<String>,
    options: TargetTransformOptionsV0,
) -> TransformTargetQueryPlanV0 {
    let query = query.into();
    let normalized_query = normalize_target_query(&query);
    let target_resolution = target_feature_support_for_query(&normalized_query);
    let transform_plan = plan_target_transforms(
        target_resolution.profile_id,
        target_resolution.support,
        options,
    );

    TransformTargetQueryPlanV0 {
        schema_version: "0",
        product: "omena-transform-target.query-plan",
        query,
        normalized_query,
        profile_id: target_resolution.profile_id,
        recognized_profile: target_resolution.recognized_profile,
        target_data_source: target_resolution.target_data_source,
        target_data_contract_id: target_resolution.target_data_contract_id,
        target_data_snapshot_id: target_resolution.target_data_snapshot_id,
        target_data_evidence: target_resolution.target_data_evidence,
        vendor_prefix_matrix_source: target_resolution.vendor_prefix_matrix_source,
        vendor_prefix_policy: target_resolution.vendor_prefix_policy,
        resolved_targets: target_resolution.resolved_targets,
        resolution_error: target_resolution.resolution_error,
        support: target_resolution.support,
        transform_plan,
        native_stage2_coverage: summarize_native_stage2_coverage(),
    }
}

pub fn plan_target_transforms(
    target_label: impl Into<String>,
    support: TargetFeatureSupportV0,
    options: TargetTransformOptionsV0,
) -> TransformTargetPlanV0 {
    let target_label = target_label.into();
    let mut required_passes = Vec::new();
    let mut blocked_passes = Vec::new();

    if support.vendor_prefix_required {
        required_passes.push(TransformPassKind::VendorPrefixing);
    } else {
        required_passes.push(TransformPassKind::StalePrefixRemoval);
    }
    if !support.supports_light_dark {
        required_passes.push(TransformPassKind::LightDarkLowering);
    }
    if !support.supports_color_mix {
        required_passes.push(TransformPassKind::ColorMixLowering);
    }
    if !support.supports_oklch_oklab {
        required_passes.push(TransformPassKind::OklchOklabLowering);
    }
    if !support.supports_color_function {
        required_passes.push(TransformPassKind::ColorFunctionLowering);
    }
    if !support.supports_relative_color {
        required_passes.push(TransformPassKind::RelativeColorLowering);
    }
    if !support.supports_logical_properties {
        push_required_or_blocked(
            TransformPassKind::LogicalToPhysical,
            options.allow_logical_to_physical,
            &mut required_passes,
            &mut blocked_passes,
        );
    }
    if !support.supports_css_nesting {
        required_passes.push(TransformPassKind::NestingUnwrap);
    }
    if !support.supports_css_scope {
        push_required_or_blocked(
            TransformPassKind::ScopeFlatten,
            options.allow_scope_flatten,
            &mut required_passes,
            &mut blocked_passes,
        );
    }
    if !support.supports_cascade_layers {
        push_required_or_blocked(
            TransformPassKind::LayerFlatten,
            options.allow_layer_flatten,
            &mut required_passes,
            &mut blocked_passes,
        );
    }
    if options.enable_supports_static_eval {
        required_passes.push(TransformPassKind::SupportsStaticEval);
    }
    if options.enable_media_static_eval {
        required_passes.push(TransformPassKind::MediaStaticEval);
    }
    if options.enable_container_static_eval {
        required_passes.push(TransformPassKind::ContainerStaticEval);
    }
    if options.drop_dark_mode_media_queries {
        required_passes.push(TransformPassKind::DeadMediaBranchRemoval);
    }

    required_passes.sort_by_key(|pass| transform_pass_sort_ordinal(*pass));
    required_passes.dedup();
    blocked_passes.sort_by_key(|pass| transform_pass_sort_ordinal(*pass));
    blocked_passes.dedup();

    let pass_plan = plan_transform_passes(&required_passes);
    let planned_pass_ids = pass_plan.ordered_pass_ids.clone();

    TransformTargetPlanV0 {
        schema_version: "0",
        product: "omena-transform-target.plan",
        target_label,
        required_pass_ids: required_passes.iter().map(|pass| pass.id()).collect(),
        blocked_pass_ids: blocked_passes.iter().map(|pass| pass.id()).collect(),
        planned_pass_ids,
        pass_plan,
    }
}

pub const fn modern_feature_support() -> TargetFeatureSupportV0 {
    TargetFeatureSupportV0 {
        vendor_prefix_required: false,
        supports_light_dark: true,
        supports_color_mix: true,
        supports_oklch_oklab: true,
        supports_color_function: true,
        supports_relative_color: true,
        supports_logical_properties: true,
        supports_css_nesting: true,
        supports_css_scope: true,
        supports_cascade_layers: true,
    }
}

pub const fn legacy_webview_feature_support() -> TargetFeatureSupportV0 {
    TargetFeatureSupportV0 {
        vendor_prefix_required: true,
        supports_light_dark: false,
        supports_color_mix: false,
        supports_oklch_oklab: false,
        supports_color_function: false,
        supports_relative_color: false,
        supports_logical_properties: false,
        supports_css_nesting: false,
        supports_css_scope: false,
        supports_cascade_layers: false,
    }
}

pub const fn conservative_target_options() -> TargetTransformOptionsV0 {
    TargetTransformOptionsV0 {
        allow_logical_to_physical: false,
        allow_scope_flatten: false,
        allow_layer_flatten: false,
        enable_supports_static_eval: false,
        enable_media_static_eval: false,
        enable_container_static_eval: false,
        drop_dark_mode_media_queries: false,
    }
}

struct TargetQueryResolutionV0 {
    profile_id: &'static str,
    recognized_profile: bool,
    target_data_source: &'static str,
    target_data_contract_id: &'static str,
    target_data_snapshot_id: String,
    target_data_evidence: Vec<TransformTargetDataEvidenceV0>,
    vendor_prefix_matrix_source: &'static str,
    vendor_prefix_policy: Option<TransformVendorPrefixPolicyV0>,
    resolved_targets: Vec<String>,
    resolution_error: Option<String>,
    support: TargetFeatureSupportV0,
}

fn normalize_target_query(query: &str) -> String {
    query
        .split_whitespace()
        .collect::<Vec<_>>()
        .join(" ")
        .trim()
        .to_ascii_lowercase()
}

fn target_feature_support_for_query(normalized_query: &str) -> TargetQueryResolutionV0 {
    if matches!(
        normalized_query,
        "" | "modern" | "baseline 2024" | "baseline-2024"
    ) {
        return TargetQueryResolutionV0 {
            profile_id: "modern-evergreen",
            recognized_profile: true,
            target_data_source: "staticTargetProfileV0",
            target_data_contract_id: TARGET_DATA_CONTRACT_ID,
            target_data_snapshot_id: current_target_data_snapshot_id(),
            target_data_evidence: Vec::new(),
            vendor_prefix_matrix_source: VENDOR_PREFIX_MATRIX_SOURCE,
            vendor_prefix_policy: Some(TransformVendorPrefixPolicyV0::none()),
            resolved_targets: Vec::new(),
            resolution_error: None,
            support: modern_feature_support(),
        };
    }

    if normalized_query == "legacy" || normalized_query == "legacy-webview" {
        return TargetQueryResolutionV0 {
            profile_id: "legacy-webview",
            recognized_profile: true,
            target_data_source: "staticTargetProfileV0",
            target_data_contract_id: TARGET_DATA_CONTRACT_ID,
            target_data_snapshot_id: current_target_data_snapshot_id(),
            target_data_evidence: Vec::new(),
            vendor_prefix_matrix_source: VENDOR_PREFIX_MATRIX_SOURCE,
            vendor_prefix_policy: Some(TransformVendorPrefixPolicyV0::conservative()),
            resolved_targets: Vec::new(),
            resolution_error: None,
            support: legacy_webview_feature_support(),
        };
    }

    match resolve_browserslist(&[normalized_query], &Opts::default()) {
        Ok(distribs) if !distribs.is_empty() => {
            let resolved_targets = distribs.iter().map(distrib_key).collect::<Vec<_>>();
            let target_data_evidence = target_data_evidence_for_resolved_targets(&distribs);
            TargetQueryResolutionV0 {
                profile_id: "browserslist-resolved",
                recognized_profile: true,
                target_data_source: "oxcBrowserslistV3+browserThresholdsTomlV0+generatedFeatureMatrixV0",
                target_data_contract_id: TARGET_DATA_CONTRACT_ID,
                target_data_snapshot_id: current_target_data_snapshot_id(),
                target_data_evidence,
                vendor_prefix_matrix_source: VENDOR_PREFIX_MATRIX_SOURCE,
                vendor_prefix_policy: Some(vendor_prefix_policy_for_resolved_targets(&distribs)),
                support: feature_support_for_resolved_targets(&distribs),
                resolved_targets,
                resolution_error: None,
            }
        }
        Ok(_) => unknown_conservative_resolution(None),
        Err(error) => unknown_conservative_resolution(Some(error.to_string())),
    }
}

fn unknown_conservative_resolution(resolution_error: Option<String>) -> TargetQueryResolutionV0 {
    TargetQueryResolutionV0 {
        profile_id: "unknown-conservative",
        recognized_profile: false,
        target_data_source: "staticTargetProfileV0",
        target_data_contract_id: TARGET_DATA_CONTRACT_ID,
        target_data_snapshot_id: current_target_data_snapshot_id(),
        target_data_evidence: Vec::new(),
        vendor_prefix_matrix_source: VENDOR_PREFIX_MATRIX_SOURCE,
        vendor_prefix_policy: Some(TransformVendorPrefixPolicyV0::conservative()),
        resolved_targets: Vec::new(),
        resolution_error,
        support: legacy_webview_feature_support(),
    }
}

fn vendor_prefix_policy_for_resolved_targets(
    distribs: &[Distrib],
) -> TransformVendorPrefixPolicyV0 {
    let mut policy = TransformVendorPrefixPolicyV0::none();
    for distrib in distribs {
        let browser = distrib.name();
        let version = distrib.version();
        match browser {
            "ie" => policy.ms = true,
            "edge" if !browser_version_at_least(version, 79, 0) => policy.ms = true,
            "safari" | "ios_saf" => policy.webkit = true,
            "chrome" | "and_chr" | "android" | "opera" | "op_mob"
                if !browser_version_at_least(version, 50, 0) =>
            {
                policy.webkit = true;
            }
            "firefox" if !browser_version_at_least(version, 70, 0) => policy.moz = true,
            _ => {}
        }
    }
    policy
}

fn feature_support_for_resolved_targets(distribs: &[Distrib]) -> TargetFeatureSupportV0 {
    let flexbox_fully_supported =
        target_set_is_subset_of_browser_threshold_table(distribs, "flexbox");
    let sticky_fully_supported =
        target_set_is_subset_of_browser_threshold_table(distribs, "sticky_positioning");

    TargetFeatureSupportV0 {
        vendor_prefix_required: !(flexbox_fully_supported && sticky_fully_supported),
        supports_light_dark: target_set_is_subset_of_browser_threshold_table(
            distribs,
            "light_dark",
        ),
        supports_color_mix: target_set_is_subset_of_browser_threshold_table(distribs, "color_mix"),
        supports_oklch_oklab: target_set_is_subset_of_browser_threshold_table(
            distribs,
            "oklch_oklab",
        ),
        supports_color_function: target_set_is_subset_of_browser_threshold_table(
            distribs,
            "color_function",
        ),
        supports_relative_color: target_set_is_subset_of_browser_threshold_table(
            distribs,
            "relative_color",
        ),
        supports_logical_properties: target_set_is_subset_of_browser_threshold_table(
            distribs,
            "logical_properties",
        ),
        supports_css_nesting: target_set_is_subset_of_browser_threshold_table(
            distribs,
            "css_nesting",
        ),
        supports_css_scope: target_set_is_subset_of_browser_threshold_table(distribs, "css_scope"),
        supports_cascade_layers: target_set_is_subset_of_browser_threshold_table(
            distribs,
            "cascade_layers",
        ),
    }
}

fn target_set_is_subset_of_browser_threshold_table(distribs: &[Distrib], table: &str) -> bool {
    !distribs.is_empty()
        && distribs
            .iter()
            .all(|distrib| distrib_matches_browser_threshold_table(distrib, table))
}

fn distrib_matches_browser_threshold_table(distrib: &Distrib, table: &str) -> bool {
    browser_threshold_data()
        .thresholds
        .iter()
        .filter(|threshold| threshold.table == table)
        .find(|threshold| threshold.browser == distrib.name())
        .is_some_and(|threshold| {
            browser_version_at_least(distrib.version(), threshold.min_major, threshold.min_minor)
        })
}

fn browser_threshold_data() -> &'static BrowserThresholdDataV0 {
    static DATA: OnceLock<BrowserThresholdDataV0> = OnceLock::new();
    DATA.get_or_init(|| {
        parse_browser_threshold_data(BROWSER_THRESHOLDS_SOURCE).unwrap_or_else(|_| {
            BrowserThresholdDataV0 {
                parse_error_count: 1,
                ..BrowserThresholdDataV0::default()
            }
        })
    })
}

fn pass_feature_binding_data() -> &'static PassFeatureBindingDataV0 {
    static DATA: OnceLock<PassFeatureBindingDataV0> = OnceLock::new();
    DATA.get_or_init(|| {
        parse_pass_feature_binding_data(PASS_FEATURE_BINDINGS_SOURCE).unwrap_or_else(|_| {
            PassFeatureBindingDataV0 {
                parse_error_count: 1,
                ..PassFeatureBindingDataV0::default()
            }
        })
    })
}

fn native_stage2_coverage_data() -> &'static NativeStage2CoverageDataV0 {
    static DATA: OnceLock<NativeStage2CoverageDataV0> = OnceLock::new();
    DATA.get_or_init(|| {
        serde_json::from_str(NATIVE_STAGE2_COVERAGE_SOURCE).unwrap_or_else(|_| {
            NativeStage2CoverageDataV0 {
                schema_version: "invalid".to_string(),
                product: "invalid".to_string(),
                binding_source: "invalid".to_string(),
                selection_basis: Vec::new(),
                stage1_fallback: NativeStage2CoverageFallbackV0 {
                    plugin_id: String::new(),
                    policy: String::new(),
                },
                covered_features: Vec::new(),
                uncovered_features: Vec::new(),
            }
        })
    })
}

fn target_data_source_files() -> Vec<&'static str> {
    TARGET_DATA_SOURCE_FILES.to_vec()
}

fn runtime_fallback_feature_keys() -> Vec<&'static str> {
    RUNTIME_FALLBACK_FEATURE_KEYS.to_vec()
}

fn current_target_data_snapshot_id() -> String {
    target_data_snapshot_id(browser_threshold_data(), pass_feature_binding_data())
}

fn target_data_snapshot_id(
    browser_data: &BrowserThresholdDataV0,
    bindings: &PassFeatureBindingDataV0,
) -> String {
    format!(
        "{TARGET_DATA_CONTRACT_ID}:thresholds-{}:bindings-{}",
        browser_data.refreshed_at, bindings.refreshed_at
    )
}

fn target_data_contract_summary(
    browser_data: &BrowserThresholdDataV0,
    bindings: &PassFeatureBindingDataV0,
) -> TransformTargetDataContractV0 {
    let parse_error_count = browser_data.parse_error_count + bindings.parse_error_count;
    let stale_entry_count = browser_threshold_stale_entry_count(browser_data);
    let unmapped_threshold_table_count = unmapped_threshold_table_count(browser_data, bindings);
    let unresolvable_threshold_query_count = unresolvable_threshold_query_count(browser_data);
    let quorum_valid = browser_threshold_data_is_valid(browser_data);
    let bindings_valid = pass_feature_binding_data_is_valid(browser_data, bindings);
    let resolver_provenance_valid = resolver_provenance_is_valid(browser_data, bindings);

    TransformTargetDataContractV0 {
        product: "omena-transform-target.data-contract",
        contract_id: TARGET_DATA_CONTRACT_ID,
        snapshot_id: target_data_snapshot_id(browser_data, bindings),
        browser_threshold_schema_version: browser_data.schema_version.clone(),
        pass_feature_binding_schema_version: bindings.schema_version.clone(),
        browser_threshold_refreshed_at: browser_data.refreshed_at.clone(),
        pass_feature_binding_refreshed_at: bindings.refreshed_at.clone(),
        threshold_source_policy: browser_data.threshold_source_policy.clone(),
        caniuse_resolver_workspace_dependency: browser_data
            .caniuse_resolver_workspace_dependency
            .clone(),
        caniuse_resolver_cargo_package: browser_data.caniuse_resolver_cargo_package.clone(),
        caniuse_resolver_cargo_version: browser_data.caniuse_resolver_cargo_version.clone(),
        source_files: target_data_source_files(),
        parse_error_count,
        quorum_min_sources: browser_data.quorum_min_sources,
        browser_threshold_table_count: browser_threshold_table_count(browser_data),
        browser_threshold_entry_count: browser_data.thresholds.len(),
        pass_feature_binding_count: bindings.bindings.len(),
        stale_entry_count,
        unmapped_threshold_table_count,
        unresolvable_threshold_query_count,
        runtime_fallback_feature_keys: runtime_fallback_feature_keys(),
        runtime_fallback_feature_count: RUNTIME_FALLBACK_FEATURE_KEYS.len(),
        generated_coverage_complete: RUNTIME_FALLBACK_FEATURE_KEYS.is_empty(),
        quorum_valid,
        bindings_valid,
        resolver_provenance_valid,
        valid: parse_error_count == 0
            && stale_entry_count == 0
            && unmapped_threshold_table_count == 0
            && unresolvable_threshold_query_count == 0
            && quorum_valid
            && bindings_valid
            && resolver_provenance_valid,
    }
}

fn target_data_evidence_for_resolved_targets(
    distribs: &[Distrib],
) -> Vec<TransformTargetDataEvidenceV0> {
    let browser_data = browser_threshold_data();
    pass_feature_binding_data()
        .bindings
        .iter()
        .map(|binding| {
            let resolved_targets = distribs
                .iter()
                .map(|distrib| {
                    resolved_target_evidence_for_table(
                        browser_data,
                        distrib,
                        &binding.support_table,
                    )
                })
                .collect::<Vec<_>>();
            let all_resolved_targets_supported = !resolved_targets.is_empty()
                && resolved_targets.iter().all(|target| target.supported);

            TransformTargetDataEvidenceV0 {
                product: "omena-transform-target.data-evidence",
                pass_id: binding.pass_id.clone(),
                support_table: binding.support_table.clone(),
                caniuse_keys: binding.caniuse_keys.clone(),
                source_quorum: source_quorum_for_table(browser_data, &binding.support_table),
                last_verified: last_verified_for_table(browser_data, &binding.support_table),
                resolved_targets,
                all_resolved_targets_supported,
            }
        })
        .collect()
}

fn resolved_target_evidence_for_table(
    browser_data: &BrowserThresholdDataV0,
    distrib: &Distrib,
    table: &str,
) -> TransformTargetResolvedTargetEvidenceV0 {
    let threshold = browser_threshold_for_table_and_browser(browser_data, table, distrib.name());
    let supported = threshold.is_some_and(|threshold| {
        browser_version_at_least(distrib.version(), threshold.min_major, threshold.min_minor)
    });

    TransformTargetResolvedTargetEvidenceV0 {
        browser: distrib.name().to_string(),
        version: distrib.version().to_string(),
        supported,
        matched_threshold: threshold.map(threshold_evidence),
    }
}

fn threshold_evidence(threshold: &BrowserFeatureThresholdV0) -> TransformTargetThresholdEvidenceV0 {
    TransformTargetThresholdEvidenceV0 {
        browser: threshold.browser.clone(),
        min_version: format!("{}.{}", threshold.min_major, threshold.min_minor),
        caniuse_key: threshold.caniuse_key.clone(),
        source_quorum: threshold.source_quorum.clone(),
        last_verified: threshold.last_verified.clone(),
    }
}

fn browser_threshold_for_table_and_browser<'a>(
    browser_data: &'a BrowserThresholdDataV0,
    table: &str,
    browser: &str,
) -> Option<&'a BrowserFeatureThresholdV0> {
    browser_data
        .thresholds
        .iter()
        .find(|threshold| threshold.table == table && threshold.browser == browser)
}

fn source_quorum_for_table(browser_data: &BrowserThresholdDataV0, table: &str) -> Vec<String> {
    let mut sources = Vec::new();
    for threshold in browser_data
        .thresholds
        .iter()
        .filter(|threshold| threshold.table == table)
    {
        push_unique_strings(&mut sources, threshold.source_quorum.iter());
    }
    sources
}

fn last_verified_for_table(browser_data: &BrowserThresholdDataV0, table: &str) -> Vec<String> {
    let mut dates = Vec::new();
    for threshold in browser_data
        .thresholds
        .iter()
        .filter(|threshold| threshold.table == table)
    {
        push_unique_strings(&mut dates, std::iter::once(&threshold.last_verified));
    }
    dates
}

fn push_unique_strings<'a>(output: &mut Vec<String>, values: impl IntoIterator<Item = &'a String>) {
    for value in values {
        if !output.iter().any(|existing| existing == value) {
            output.push(value.clone());
        }
    }
}

fn parse_browser_threshold_data(source: &str) -> Result<BrowserThresholdDataV0, String> {
    let mut data = BrowserThresholdDataV0::default();
    let mut current_threshold: Option<BrowserFeatureThresholdV0> = None;

    for line in significant_toml_lines(source) {
        if line == "[[threshold]]" {
            if let Some(threshold) = current_threshold.take() {
                data.thresholds.push(threshold);
            }
            current_threshold = Some(BrowserFeatureThresholdV0::default());
            continue;
        }

        let (key, value) = parse_toml_assignment(&line)?;
        if let Some(threshold) = current_threshold.as_mut() {
            match key {
                "table" => threshold.table = parse_toml_string(value)?,
                "browser" => threshold.browser = parse_toml_string(value)?,
                "min_major" => threshold.min_major = parse_toml_u16(value)?,
                "min_minor" => threshold.min_minor = parse_toml_u16(value)?,
                "caniuse_key" => threshold.caniuse_key = parse_toml_string(value)?,
                "source_quorum" => threshold.source_quorum = parse_toml_string_array(value)?,
                "last_verified" => threshold.last_verified = parse_toml_string(value)?,
                _ => return Err(format!("unknown browser threshold key `{key}`")),
            }
        } else {
            match key {
                "schema_version" => data.schema_version = parse_toml_string(value)?,
                "product" => data.product = parse_toml_string(value)?,
                "refreshed_at" => data.refreshed_at = parse_toml_string(value)?,
                "threshold_source_policy" => {
                    data.threshold_source_policy = parse_toml_string(value)?
                }
                "quorum_min_sources" => data.quorum_min_sources = parse_toml_usize(value)?,
                "caniuse_resolver_workspace_dependency" => {
                    data.caniuse_resolver_workspace_dependency = parse_toml_string(value)?
                }
                "caniuse_resolver_cargo_package" => {
                    data.caniuse_resolver_cargo_package = parse_toml_string(value)?
                }
                "caniuse_resolver_cargo_version" => {
                    data.caniuse_resolver_cargo_version = parse_toml_string(value)?
                }
                _ => return Err(format!("unknown browser threshold root key `{key}`")),
            }
        }
    }

    if let Some(threshold) = current_threshold.take() {
        data.thresholds.push(threshold);
    }

    Ok(data)
}

fn parse_pass_feature_binding_data(source: &str) -> Result<PassFeatureBindingDataV0, String> {
    let mut data = PassFeatureBindingDataV0::default();
    let mut current_binding: Option<PassFeatureBindingV0> = None;

    for line in significant_toml_lines(source) {
        if line == "[[binding]]" {
            if let Some(binding) = current_binding.take() {
                data.bindings.push(binding);
            }
            current_binding = Some(PassFeatureBindingV0::default());
            continue;
        }

        let (key, value) = parse_toml_assignment(&line)?;
        if let Some(binding) = current_binding.as_mut() {
            match key {
                "pass_id" => binding.pass_id = parse_toml_string(value)?,
                "caniuse_keys" => binding.caniuse_keys = parse_toml_string_array(value)?,
                "support_table" => binding.support_table = parse_toml_string(value)?,
                _ => return Err(format!("unknown pass feature binding key `{key}`")),
            }
        } else {
            match key {
                "schema_version" => data.schema_version = parse_toml_string(value)?,
                "product" => data.product = parse_toml_string(value)?,
                "refreshed_at" => data.refreshed_at = parse_toml_string(value)?,
                "caniuse_resolver_workspace_dependency" => {
                    data.caniuse_resolver_workspace_dependency = parse_toml_string(value)?
                }
                "caniuse_resolver_cargo_package" => {
                    data.caniuse_resolver_cargo_package = parse_toml_string(value)?
                }
                "caniuse_resolver_cargo_version" => {
                    data.caniuse_resolver_cargo_version = parse_toml_string(value)?
                }
                _ => return Err(format!("unknown pass feature binding root key `{key}`")),
            }
        }
    }

    if let Some(binding) = current_binding.take() {
        data.bindings.push(binding);
    }

    Ok(data)
}

fn significant_toml_lines(source: &str) -> impl Iterator<Item = String> + '_ {
    source
        .lines()
        .map(|line| line.split('#').next().unwrap_or("").trim())
        .filter(|line| !line.is_empty())
        .map(ToOwned::to_owned)
}

fn parse_toml_assignment(line: &str) -> Result<(&str, &str), String> {
    let Some((key, value)) = line.split_once('=') else {
        return Err(format!("invalid assignment `{line}`"));
    };
    Ok((key.trim(), value.trim()))
}

fn parse_toml_string(value: &str) -> Result<String, String> {
    let value = value.trim();
    if value.len() < 2 || !value.starts_with('"') || !value.ends_with('"') {
        return Err(format!("expected quoted string, got `{value}`"));
    }
    Ok(value[1..value.len() - 1].to_string())
}

fn parse_toml_u16(value: &str) -> Result<u16, String> {
    value
        .trim()
        .parse::<u16>()
        .map_err(|error| format!("invalid u16 `{value}`: {error}"))
}

fn parse_toml_usize(value: &str) -> Result<usize, String> {
    value
        .trim()
        .parse::<usize>()
        .map_err(|error| format!("invalid usize `{value}`: {error}"))
}

fn parse_toml_string_array(value: &str) -> Result<Vec<String>, String> {
    let value = value.trim();
    if value.len() < 2 || !value.starts_with('[') || !value.ends_with(']') {
        return Err(format!("expected string array, got `{value}`"));
    }
    let body = value[1..value.len() - 1].trim();
    if body.is_empty() {
        return Ok(Vec::new());
    }

    body.split(',')
        .map(|item| parse_toml_string(item.trim()))
        .collect()
}

fn browser_threshold_data_is_valid(data: &BrowserThresholdDataV0) -> bool {
    data.parse_error_count == 0
        && data.schema_version == "0"
        && data.product == "omena-transform-target.browser-thresholds"
        && is_iso_date(&data.refreshed_at)
        && data.threshold_source_policy == THRESHOLD_SOURCE_POLICY
        && data.quorum_min_sources == COMPAT_QUORUM_SOURCES.len()
        && data.caniuse_resolver_workspace_dependency == CANIUSE_RESOLVER_WORKSPACE_DEPENDENCY
        && data.caniuse_resolver_cargo_package == CANIUSE_RESOLVER_CARGO_PACKAGE
        && !data.caniuse_resolver_cargo_version.is_empty()
        && browser_threshold_table_count(data) >= 2
        && browser_threshold_stale_entry_count(data) == 0
        && unresolvable_threshold_query_count(data) == 0
        && data.thresholds.iter().all(|threshold| {
            !threshold.table.is_empty()
                && !threshold.browser.is_empty()
                && !threshold.caniuse_key.is_empty()
                && compat_source_quorum_is_complete(&threshold.source_quorum)
                && is_iso_date(&threshold.last_verified)
        })
}

fn compat_source_quorum_is_complete(source_quorum: &[String]) -> bool {
    source_quorum.len() == COMPAT_QUORUM_SOURCES.len()
        && COMPAT_QUORUM_SOURCES
            .iter()
            .all(|expected| source_quorum.iter().any(|source| source == expected))
}

fn pass_feature_binding_data_is_valid(
    browser_data: &BrowserThresholdDataV0,
    binding_data: &PassFeatureBindingDataV0,
) -> bool {
    binding_data.parse_error_count == 0
        && binding_data.schema_version == "0"
        && binding_data.product == "omena-transform-target.pass-feature-bindings"
        && is_iso_date(&binding_data.refreshed_at)
        && binding_data.caniuse_resolver_workspace_dependency
            == CANIUSE_RESOLVER_WORKSPACE_DEPENDENCY
        && binding_data.caniuse_resolver_cargo_package == CANIUSE_RESOLVER_CARGO_PACKAGE
        && !binding_data.caniuse_resolver_cargo_version.is_empty()
        && !binding_data.bindings.is_empty()
        && unmapped_threshold_table_count(browser_data, binding_data) == 0
        && binding_data.bindings.iter().all(|binding| {
            !binding.pass_id.is_empty()
                && target_managed_passes()
                    .iter()
                    .any(|pass| pass.id() == binding.pass_id)
                && !binding.caniuse_keys.is_empty()
                && binding.caniuse_keys.iter().all(|key| {
                    browser_data.thresholds.iter().any(|threshold| {
                        threshold.table == binding.support_table && threshold.caniuse_key == *key
                    })
                })
        })
}

fn resolver_provenance_is_valid(
    browser_data: &BrowserThresholdDataV0,
    binding_data: &PassFeatureBindingDataV0,
) -> bool {
    browser_data.caniuse_resolver_workspace_dependency == CANIUSE_RESOLVER_WORKSPACE_DEPENDENCY
        && browser_data.caniuse_resolver_cargo_package == CANIUSE_RESOLVER_CARGO_PACKAGE
        && !browser_data.caniuse_resolver_cargo_version.is_empty()
        && browser_data.caniuse_resolver_workspace_dependency
            == binding_data.caniuse_resolver_workspace_dependency
        && browser_data.caniuse_resolver_cargo_package
            == binding_data.caniuse_resolver_cargo_package
        && browser_data.caniuse_resolver_cargo_version
            == binding_data.caniuse_resolver_cargo_version
}

fn browser_threshold_stale_entry_count(data: &BrowserThresholdDataV0) -> usize {
    data.thresholds
        .iter()
        .filter(|threshold| threshold.last_verified != data.refreshed_at)
        .count()
}

fn unmapped_threshold_table_count(
    browser_data: &BrowserThresholdDataV0,
    binding_data: &PassFeatureBindingDataV0,
) -> usize {
    let bound_tables = binding_data
        .bindings
        .iter()
        .map(|binding| binding.support_table.as_str())
        .collect::<BTreeSet<_>>();
    browser_data
        .thresholds
        .iter()
        .map(|threshold| threshold.table.as_str())
        .collect::<BTreeSet<_>>()
        .difference(&bound_tables)
        .count()
}

fn unresolvable_threshold_query_count(browser_data: &BrowserThresholdDataV0) -> usize {
    browser_data
        .thresholds
        .iter()
        .filter(|threshold| !threshold_browser_query_resolves(threshold))
        .count()
}

fn threshold_browser_query_resolves(threshold: &BrowserFeatureThresholdV0) -> bool {
    let query = threshold_browser_query(threshold);
    resolve_browserslist(&[query.as_str()], &Opts::default()).is_ok_and(|distribs| {
        distribs.iter().any(|distrib| {
            distrib.name() == threshold.browser
                && browser_version_at_least(
                    distrib.version(),
                    threshold.min_major,
                    threshold.min_minor,
                )
        })
    })
}

fn threshold_browser_query(threshold: &BrowserFeatureThresholdV0) -> String {
    browser_version_query(
        threshold.browser.as_str(),
        threshold.min_major,
        threshold.min_minor,
    )
}

fn browser_version_query(browser: &str, major: u16, minor: u16) -> String {
    if minor == 0 {
        format!("{browser} {major}")
    } else {
        format!("{browser} {major}.{minor}")
    }
}

fn browser_threshold_table_count(data: &BrowserThresholdDataV0) -> usize {
    data.thresholds
        .iter()
        .map(|threshold| threshold.table.as_str())
        .collect::<BTreeSet<_>>()
        .len()
}

fn is_iso_date(value: &str) -> bool {
    let bytes = value.as_bytes();
    bytes.len() == 10
        && bytes[4] == b'-'
        && bytes[7] == b'-'
        && bytes
            .iter()
            .enumerate()
            .all(|(index, byte)| matches!(index, 4 | 7) || byte.is_ascii_digit())
}

fn browser_version_at_least(version: &str, min_major: u16, min_minor: u16) -> bool {
    if version.eq_ignore_ascii_case("tp") {
        return true;
    }

    let version = version.split('-').next().unwrap_or(version);
    let mut parts = version.split('.');
    let Some(major) = parts.next().and_then(|part| part.parse::<u16>().ok()) else {
        return false;
    };
    let minor = parts
        .next()
        .and_then(|part| part.parse::<u16>().ok())
        .unwrap_or(0);

    major > min_major || (major == min_major && minor >= min_minor)
}

fn distrib_key(distrib: &Distrib) -> String {
    distrib.to_string()
}

fn push_required_or_blocked(
    pass: TransformPassKind,
    allowed: bool,
    required_passes: &mut Vec<TransformPassKind>,
    blocked_passes: &mut Vec<TransformPassKind>,
) {
    if allowed {
        required_passes.push(pass);
    } else {
        blocked_passes.push(pass);
    }
}

fn target_managed_passes() -> [TransformPassKind; 14] {
    [
        TransformPassKind::VendorPrefixing,
        TransformPassKind::StalePrefixRemoval,
        TransformPassKind::LightDarkLowering,
        TransformPassKind::ColorMixLowering,
        TransformPassKind::OklchOklabLowering,
        TransformPassKind::ColorFunctionLowering,
        TransformPassKind::RelativeColorLowering,
        TransformPassKind::LogicalToPhysical,
        TransformPassKind::NestingUnwrap,
        TransformPassKind::ScopeFlatten,
        TransformPassKind::LayerFlatten,
        TransformPassKind::SupportsStaticEval,
        TransformPassKind::MediaStaticEval,
        TransformPassKind::DeadMediaBranchRemoval,
    ]
}

#[cfg(test)]
mod tests {
    use super::{
        TargetFeatureSupportV0, TargetTransformOptionsV0, conservative_target_options,
        plan_target_transforms, plan_target_transforms_from_query,
        summarize_omena_transform_target_boundary,
    };

    #[test]
    fn exposes_target_lowering_boundary() {
        let boundary = summarize_omena_transform_target_boundary();

        assert_eq!(boundary.product, "omena-transform-target.boundary");
        assert_eq!(boundary.managed_pass_ids.len(), 14);
        assert_eq!(
            boundary.target_data_source,
            "oxcBrowserslistV3+browserThresholdsTomlV0+staticTargetProfileV0+generatedFeatureMatrixV0"
        );
        assert_eq!(boundary.browser_threshold_table_count, 11);
        assert_eq!(boundary.browser_threshold_entry_count, 119);
        assert_eq!(boundary.pass_feature_binding_count, 13);
        assert_eq!(boundary.browser_data_parse_error_count, 0);
        assert!(boundary.browser_data_quorum_valid);
        assert!(boundary.browser_data_bindings_valid);
        assert_eq!(
            boundary.target_data_contract.contract_id,
            super::TARGET_DATA_CONTRACT_ID
        );
        assert_eq!(
            boundary.target_data_contract.snapshot_id,
            "omena-transform-target-data-v0:thresholds-2026-07-19:bindings-2026-07-19"
        );
        assert!(boundary.target_data_contract.valid);
        assert_eq!(boundary.target_data_contract.pass_feature_binding_count, 13);
        assert_eq!(
            boundary
                .target_data_contract
                .caniuse_resolver_workspace_dependency,
            super::CANIUSE_RESOLVER_WORKSPACE_DEPENDENCY
        );
        assert_eq!(
            boundary.target_data_contract.caniuse_resolver_cargo_package,
            super::CANIUSE_RESOLVER_CARGO_PACKAGE
        );
        assert_eq!(
            boundary.target_data_contract.caniuse_resolver_cargo_version,
            "3.0.5"
        );
        assert_eq!(
            boundary.target_data_contract.threshold_source_policy,
            super::THRESHOLD_SOURCE_POLICY
        );
        assert!(boundary.target_data_contract.resolver_provenance_valid);
        assert_eq!(boundary.target_data_contract.stale_entry_count, 0);
        assert_eq!(
            boundary.target_data_contract.unmapped_threshold_table_count,
            0
        );
        assert_eq!(
            boundary
                .target_data_contract
                .unresolvable_threshold_query_count,
            0
        );
        assert_eq!(
            boundary.target_data_contract.runtime_fallback_feature_keys,
            Vec::<&'static str>::new()
        );
        assert_eq!(
            boundary.target_data_contract.runtime_fallback_feature_count,
            0
        );
        assert!(boundary.target_data_contract.generated_coverage_complete);
        assert_eq!(
            boundary.runtime_fallback_feature_keys,
            boundary.target_data_contract.runtime_fallback_feature_keys
        );
        assert!(boundary.generated_coverage_complete);
        assert_eq!(boundary.native_stage2_coverage.covered_feature_count, 11);
        assert_eq!(boundary.native_stage2_coverage.uncovered_feature_count, 6);
        assert!(boundary.native_stage2_coverage.covered_pass_census_valid);
        assert!(boundary.native_stage2_coverage.binding_census_valid);
        assert!(boundary.native_stage2_coverage.valid);
        assert_eq!(
            boundary.vendor_prefix_matrix_source,
            super::VENDOR_PREFIX_MATRIX_SOURCE
        );
        assert!(boundary.managed_pass_ids.contains(&"vendor-prefixing"));
        assert!(boundary.managed_pass_ids.contains(&"stale-prefix-removal"));
        assert!(boundary.managed_pass_ids.contains(&"media-static-eval"));
        assert!(boundary.opt_in_pass_ids.contains(&"scope-flatten"));
    }

    #[test]
    fn native_stage2_coverage_is_complete_for_declared_native_features() {
        let coverage = super::summarize_native_stage2_coverage();

        assert!(coverage.valid);
        assert_eq!(coverage.covered_feature_count, 11);
        assert_eq!(coverage.uncovered_feature_count, 6);
        assert_eq!(
            coverage.stage1_fallback.plugin_id,
            "autoprefixer-legacy-browsers"
        );
        assert!(coverage.covered_features.iter().any(|feature| {
            feature.feature_id == "relative-color"
                && feature.pass_ids == ["relative-color-lowering"]
                && feature.target_rule == "allResolvedTargetsMeet:relative_color"
        }));
        assert!(coverage.uncovered_features.iter().any(|feature| {
            feature.feature_id == "vendor-prefixing.user-select" && feature.fallback == "stage1"
        }));
    }

    #[test]
    fn relative_color_lowering_tracks_its_own_browser_support_table() {
        let unsupported =
            plan_target_transforms_from_query("chrome 121", conservative_target_options());
        let supported =
            plan_target_transforms_from_query("chrome 122", conservative_target_options());

        assert!(!unsupported.support.supports_relative_color);
        assert!(
            unsupported
                .transform_plan
                .planned_pass_ids
                .contains(&"relative-color-lowering")
        );
        assert!(supported.support.supports_relative_color);
        assert!(
            !supported
                .transform_plan
                .planned_pass_ids
                .contains(&"relative-color-lowering")
        );
    }

    #[test]
    fn browser_data_governance_externalizes_thresholds_and_bindings() {
        let boundary = summarize_omena_transform_target_boundary();

        assert!(
            boundary
                .browser_data_source_files
                .contains(&"data/browser-thresholds.toml")
        );
        assert!(
            boundary
                .browser_data_source_files
                .contains(&"data/pass-feature-bindings.toml")
        );
        assert!(boundary.browser_data_quorum_valid);
        assert!(boundary.browser_data_bindings_valid);
        assert_eq!(
            boundary
                .target_data_contract
                .unresolvable_threshold_query_count,
            0
        );
        assert_eq!(
            boundary.target_data_contract.source_files,
            boundary.browser_data_source_files
        );
        assert_eq!(
            boundary
                .target_data_contract
                .browser_threshold_schema_version,
            "0"
        );
        assert_eq!(
            boundary
                .target_data_contract
                .pass_feature_binding_schema_version,
            "0"
        );
        assert_eq!(
            boundary.target_data_contract.threshold_source_policy,
            super::THRESHOLD_SOURCE_POLICY
        );
        assert!(boundary.target_data_contract.resolver_provenance_valid);
        assert_eq!(
            boundary.target_data_contract.runtime_fallback_feature_count,
            0
        );
        assert!(boundary.target_data_contract.generated_coverage_complete);
    }

    #[test]
    fn generated_browser_threshold_rows_resolve_and_match_pass_boundaries() {
        let browser_data = super::browser_threshold_data();
        let bindings = super::pass_feature_binding_data();
        let options = TargetTransformOptionsV0 {
            allow_logical_to_physical: true,
            allow_scope_flatten: true,
            allow_layer_flatten: true,
            enable_supports_static_eval: false,
            enable_media_static_eval: false,
            enable_container_static_eval: false,
            drop_dark_mode_media_queries: false,
        };

        for binding in &bindings.bindings {
            let pass_id = binding.pass_id.as_str();
            for threshold in browser_data
                .thresholds
                .iter()
                .filter(|threshold| threshold.table == binding.support_table)
            {
                let query = super::threshold_browser_query(threshold);
                let plan = plan_target_transforms_from_query(query.clone(), options);
                assert_eq!(
                    plan.profile_id, "browserslist-resolved",
                    "{query} must resolve through oxc-browserslist"
                );

                let evidence = plan.target_data_evidence.iter().find(|evidence| {
                    evidence.support_table == threshold.table && evidence.pass_id == pass_id
                });
                assert!(
                    evidence.is_some(),
                    "{query} missing evidence for {}",
                    threshold.table
                );
                let Some(evidence) = evidence else {
                    continue;
                };
                let resolved_target = evidence
                    .resolved_targets
                    .iter()
                    .find(|target| target.browser == threshold.browser);
                assert!(
                    resolved_target.is_some(),
                    "{query} missing resolved target {}",
                    threshold.browser
                );
                let Some(resolved_target) = resolved_target else {
                    continue;
                };
                assert!(
                    resolved_target.supported,
                    "{query} should satisfy {}",
                    threshold.table
                );
                if pass_id != super::TransformPassKind::VendorPrefixing.id()
                    && pass_id != super::TransformPassKind::StalePrefixRemoval.id()
                {
                    assert!(
                        !plan.transform_plan.required_pass_ids.contains(&pass_id),
                        "{query} should not require {pass_id} at the support threshold"
                    );
                    assert!(
                        !plan.transform_plan.blocked_pass_ids.contains(&pass_id),
                        "{query} should not block {pass_id} at the support threshold"
                    );
                }

                if let Some((previous_major, previous_minor)) =
                    previous_browser_version(threshold.min_major, threshold.min_minor)
                {
                    let previous_query = super::browser_version_query(
                        threshold.browser.as_str(),
                        previous_major,
                        previous_minor,
                    );
                    let previous_plan =
                        plan_target_transforms_from_query(previous_query.clone(), options);
                    if previous_plan.profile_id == "browserslist-resolved"
                        && previous_plan
                            .resolved_targets
                            .iter()
                            .any(|target| target == &previous_query)
                    {
                        let previous_evidence =
                            previous_plan.target_data_evidence.iter().find(|evidence| {
                                evidence.support_table == threshold.table
                                    && evidence.pass_id == pass_id
                            });
                        assert!(
                            previous_evidence.is_some(),
                            "{previous_query} missing evidence for {}",
                            threshold.table
                        );
                        let Some(previous_evidence) = previous_evidence else {
                            continue;
                        };
                        let previous_target = previous_evidence
                            .resolved_targets
                            .iter()
                            .find(|target| target.browser == threshold.browser);
                        assert!(
                            previous_target.is_some(),
                            "{previous_query} missing resolved target {}",
                            threshold.browser
                        );
                        let Some(previous_target) = previous_target else {
                            continue;
                        };
                        assert!(
                            !previous_target.supported,
                            "{previous_query} should not satisfy {}",
                            threshold.table
                        );
                        if pass_id != super::TransformPassKind::VendorPrefixing.id()
                            && pass_id != super::TransformPassKind::StalePrefixRemoval.id()
                        {
                            assert!(
                                previous_plan
                                    .transform_plan
                                    .required_pass_ids
                                    .contains(&pass_id)
                                    || previous_plan
                                        .transform_plan
                                        .blocked_pass_ids
                                        .contains(&pass_id),
                                "{previous_query} should require or block {pass_id} below the support threshold"
                            );
                        }
                    }
                }
            }
        }
    }

    fn previous_browser_version(major: u16, minor: u16) -> Option<(u16, u16)> {
        if minor > 0 {
            return Some((major, minor - 1));
        }
        major.checked_sub(1).map(|previous| (previous, 0))
    }

    #[test]
    fn plans_target_lowering_with_vendor_prefix_after_lowering_edges() {
        let support = TargetFeatureSupportV0 {
            vendor_prefix_required: true,
            supports_light_dark: false,
            supports_color_mix: false,
            supports_oklch_oklab: true,
            supports_color_function: true,
            supports_relative_color: true,
            supports_logical_properties: true,
            supports_css_nesting: false,
            supports_css_scope: false,
            supports_cascade_layers: false,
        };
        let options = TargetTransformOptionsV0 {
            allow_logical_to_physical: false,
            allow_scope_flatten: true,
            allow_layer_flatten: true,
            enable_supports_static_eval: true,
            enable_media_static_eval: true,
            enable_container_static_eval: false,
            drop_dark_mode_media_queries: false,
        };

        let plan = plan_target_transforms("legacy-webview", support, options);

        assert_eq!(plan.pass_plan.violated_dag_edge_count, 0);
        assert!(plan.required_pass_ids.contains(&"light-dark-lowering"));
        assert!(plan.required_pass_ids.contains(&"color-mix-lowering"));
        assert!(plan.required_pass_ids.contains(&"vendor-prefixing"));
        assert!(plan.required_pass_ids.contains(&"scope-flatten"));
        assert!(plan.required_pass_ids.contains(&"layer-flatten"));
        let vendor_index = plan
            .planned_pass_ids
            .iter()
            .position(|id| *id == "vendor-prefixing");
        let light_dark_index = plan
            .planned_pass_ids
            .iter()
            .position(|id| *id == "light-dark-lowering");
        assert!(light_dark_index < vendor_index);
    }

    #[test]
    fn blocks_opt_in_flattening_when_not_explicitly_enabled() {
        let support = TargetFeatureSupportV0 {
            supports_css_scope: false,
            supports_cascade_layers: false,
            ..super::modern_feature_support()
        };

        let plan = plan_target_transforms(
            "modern-without-scope",
            support,
            conservative_target_options(),
        );

        assert!(plan.blocked_pass_ids.contains(&"scope-flatten"));
        assert!(plan.blocked_pass_ids.contains(&"layer-flatten"));
        assert!(!plan.required_pass_ids.contains(&"scope-flatten"));
        assert!(!plan.required_pass_ids.contains(&"layer-flatten"));
    }

    #[test]
    fn plans_dark_mode_media_drop_as_dead_media_branch_pass() {
        let mut options = conservative_target_options();
        options.drop_dark_mode_media_queries = true;

        let plan = plan_target_transforms("modern", super::modern_feature_support(), options);

        assert!(
            plan.required_pass_ids
                .contains(&"dead-media-branch-removal")
        );
        assert!(plan.planned_pass_ids.contains(&"dead-media-branch-removal"));
    }

    #[test]
    fn plans_stale_prefix_removal_for_targets_that_do_not_need_prefixes() {
        let plan = plan_target_transforms(
            "modern",
            super::modern_feature_support(),
            conservative_target_options(),
        );

        assert!(plan.required_pass_ids.contains(&"stale-prefix-removal"));
        assert!(!plan.required_pass_ids.contains(&"vendor-prefixing"));
        assert!(plan.planned_pass_ids.contains(&"stale-prefix-removal"));
    }

    #[test]
    fn plans_target_lowering_from_static_target_query_profiles() {
        let options = TargetTransformOptionsV0 {
            allow_logical_to_physical: true,
            allow_scope_flatten: true,
            allow_layer_flatten: true,
            enable_supports_static_eval: true,
            enable_media_static_eval: true,
            enable_container_static_eval: false,
            drop_dark_mode_media_queries: false,
        };
        let plan = plan_target_transforms_from_query("legacy-webview", options);

        assert!(plan.recognized_profile);
        assert_eq!(plan.normalized_query, "legacy-webview");
        assert_eq!(plan.profile_id, "legacy-webview");
        assert!(plan.support.vendor_prefix_required);
        assert_eq!(
            plan.vendor_prefix_policy,
            Some(super::TransformVendorPrefixPolicyV0::conservative())
        );
        assert_eq!(plan.transform_plan.pass_plan.violated_dag_edge_count, 0);
        assert!(
            plan.transform_plan
                .required_pass_ids
                .contains(&"vendor-prefixing")
        );
        assert!(
            plan.transform_plan
                .required_pass_ids
                .contains(&"nesting-unwrap")
        );
        assert!(
            plan.transform_plan
                .required_pass_ids
                .contains(&"logical-to-physical")
        );

        let modern = plan_target_transforms_from_query("modern", conservative_target_options());
        assert!(modern.recognized_profile);
        assert_eq!(modern.profile_id, "modern-evergreen");
        assert_eq!(modern.target_data_source, "staticTargetProfileV0");
        assert_eq!(
            modern.target_data_contract_id,
            super::TARGET_DATA_CONTRACT_ID
        );
        assert_eq!(
            modern.target_data_snapshot_id,
            "omena-transform-target-data-v0:thresholds-2026-07-19:bindings-2026-07-19"
        );
        assert!(modern.target_data_evidence.is_empty());
        assert_eq!(
            modern.vendor_prefix_policy,
            Some(super::TransformVendorPrefixPolicyV0::none())
        );
        assert_eq!(
            modern.transform_plan.required_pass_ids,
            vec!["stale-prefix-removal"]
        );
    }

    #[test]
    fn plans_target_lowering_from_resolved_browserslist_query() {
        let options = TargetTransformOptionsV0 {
            allow_logical_to_physical: true,
            allow_scope_flatten: true,
            allow_layer_flatten: true,
            enable_supports_static_eval: false,
            enable_media_static_eval: false,
            enable_container_static_eval: false,
            drop_dark_mode_media_queries: false,
        };
        let plan = plan_target_transforms_from_query("ie 11", options);

        assert!(plan.recognized_profile);
        assert_eq!(plan.profile_id, "browserslist-resolved");
        assert_eq!(
            plan.target_data_source,
            "oxcBrowserslistV3+browserThresholdsTomlV0+generatedFeatureMatrixV0"
        );
        assert_eq!(plan.resolved_targets, vec!["ie 11"]);
        assert_eq!(plan.resolution_error, None);
        assert_eq!(plan.target_data_contract_id, super::TARGET_DATA_CONTRACT_ID);
        assert_eq!(
            plan.target_data_snapshot_id,
            "omena-transform-target-data-v0:thresholds-2026-07-19:bindings-2026-07-19"
        );
        assert_eq!(plan.target_data_evidence.len(), 13);
        assert_eq!(
            plan.vendor_prefix_policy,
            Some(super::TransformVendorPrefixPolicyV0 {
                webkit: false,
                moz: false,
                ms: true,
            })
        );
        assert!(
            plan.target_data_evidence
                .iter()
                .any(|evidence| evidence.support_table == "light_dark"
                    && evidence.caniuse_keys == vec!["css-light-dark-function".to_string()]
                    && evidence.source_quorum
                        == vec![
                            "caniuse".to_string(),
                            "web-features".to_string(),
                            "mdn-bcd".to_string()
                        ]
                    && evidence.last_verified == vec!["2026-07-19".to_string()])
        );
        assert!(
            plan.target_data_evidence
                .iter()
                .any(|evidence| evidence.support_table == "css_nesting"
                    && evidence.caniuse_keys == vec!["css-nesting".to_string()]
                    && !evidence.all_resolved_targets_supported)
        );
        assert!(
            plan.target_data_evidence
                .iter()
                .any(|evidence| evidence.support_table == "cascade_layers"
                    && evidence.caniuse_keys == vec!["css-cascade-layers".to_string()]
                    && !evidence.all_resolved_targets_supported)
        );
        assert!(
            plan.target_data_evidence
                .iter()
                .any(|evidence| evidence.support_table == "color_function"
                    && evidence.caniuse_keys == vec!["css-color-function".to_string()]
                    && !evidence.all_resolved_targets_supported)
        );
        assert!(
            plan.target_data_evidence
                .iter()
                .any(|evidence| evidence.support_table == "css_scope"
                    && evidence.caniuse_keys == vec!["css-cascade-scope".to_string()]
                    && !evidence.all_resolved_targets_supported)
        );
        assert!(
            plan.target_data_evidence
                .iter()
                .any(|evidence| evidence.pass_id == "stale-prefix-removal"
                    && evidence.support_table == "flexbox"
                    && evidence.caniuse_keys == vec!["flexbox".to_string()]
                    && evidence.source_quorum
                        == vec![
                            "caniuse".to_string(),
                            "web-features".to_string(),
                            "mdn-bcd".to_string()
                        ])
        );
        assert!(
            plan.target_data_evidence
                .iter()
                .any(|evidence| evidence.pass_id == "stale-prefix-removal"
                    && evidence.support_table == "sticky_positioning"
                    && evidence.caniuse_keys == vec!["css-sticky".to_string()]
                    && evidence.source_quorum
                        == vec![
                            "caniuse".to_string(),
                            "web-features".to_string(),
                            "mdn-bcd".to_string()
                        ])
        );
        assert!(plan.support.vendor_prefix_required);
        assert!(
            plan.transform_plan
                .required_pass_ids
                .contains(&"vendor-prefixing")
        );
        assert!(
            plan.transform_plan
                .required_pass_ids
                .contains(&"nesting-unwrap")
        );
        assert!(
            plan.transform_plan
                .required_pass_ids
                .contains(&"logical-to-physical")
        );
    }

    #[test]
    fn resolves_target_features_from_static_compatibility_matrix() {
        let chrome_110 =
            plan_target_transforms_from_query("chrome 110", conservative_target_options());
        assert!(!chrome_110.support.supports_color_function);
        assert!(
            chrome_110
                .transform_plan
                .required_pass_ids
                .contains(&"color-function-lowering")
        );

        let chrome_111 =
            plan_target_transforms_from_query("chrome 111", conservative_target_options());
        assert!(chrome_111.support.supports_color_function);
        assert!(!chrome_111.support.supports_css_nesting);
        assert!(
            !chrome_111
                .transform_plan
                .required_pass_ids
                .contains(&"color-function-lowering")
        );
        assert!(
            chrome_111
                .transform_plan
                .required_pass_ids
                .contains(&"nesting-unwrap")
        );

        let chrome_119 =
            plan_target_transforms_from_query("chrome 119", conservative_target_options());
        assert!(!chrome_119.support.supports_css_nesting);
        assert!(
            chrome_119
                .transform_plan
                .required_pass_ids
                .contains(&"nesting-unwrap")
        );

        let chrome_120 =
            plan_target_transforms_from_query("chrome 120", conservative_target_options());
        assert!(chrome_120.support.supports_css_nesting);
        assert!(
            !chrome_120
                .transform_plan
                .required_pass_ids
                .contains(&"nesting-unwrap")
        );

        let chrome_98 =
            plan_target_transforms_from_query("chrome 98", conservative_target_options());
        assert!(!chrome_98.support.supports_cascade_layers);

        let chrome_99 =
            plan_target_transforms_from_query("chrome 99", conservative_target_options());
        assert!(chrome_99.support.supports_cascade_layers);

        let chrome_117 =
            plan_target_transforms_from_query("chrome 117", conservative_target_options());
        assert!(!chrome_117.support.supports_css_scope);

        let chrome_118 =
            plan_target_transforms_from_query("chrome 118", conservative_target_options());
        assert!(chrome_118.support.supports_css_scope);

        let chrome_122 =
            plan_target_transforms_from_query("chrome 122", conservative_target_options());
        assert_eq!(chrome_122.profile_id, "browserslist-resolved");
        assert!(!chrome_122.support.supports_light_dark);
        assert!(chrome_122.support.supports_color_mix);
        assert!(
            chrome_122
                .transform_plan
                .required_pass_ids
                .contains(&"light-dark-lowering")
        );
        assert!(
            !chrome_122
                .transform_plan
                .required_pass_ids
                .contains(&"color-mix-lowering")
        );

        let chrome_123 =
            plan_target_transforms_from_query("chrome 123", conservative_target_options());
        assert!(chrome_123.support.supports_light_dark);
        assert!(chrome_123.support.supports_color_mix);
        assert!(
            !chrome_123
                .transform_plan
                .required_pass_ids
                .contains(&"light-dark-lowering")
        );
        assert!(
            !chrome_123
                .transform_plan
                .required_pass_ids
                .contains(&"color-mix-lowering")
        );

        let safari_16_2 =
            plan_target_transforms_from_query("safari 16.2", conservative_target_options());
        assert!(!safari_16_2.support.supports_light_dark);
        assert!(safari_16_2.support.supports_color_mix);
        assert!(!safari_16_2.support.supports_css_nesting);

        let safari_17_5 =
            plan_target_transforms_from_query("safari 17.5", conservative_target_options());
        assert!(safari_17_5.support.supports_light_dark);
        assert!(safari_17_5.support.supports_color_mix);
        assert!(safari_17_5.support.supports_css_nesting);
    }

    #[test]
    fn query_plan_evidence_explains_threshold_support_for_resolved_targets() {
        let chrome_122 =
            plan_target_transforms_from_query("chrome 122", conservative_target_options());

        let light_dark = chrome_122
            .target_data_evidence
            .iter()
            .find(|evidence| evidence.support_table == "light_dark");
        assert!(
            light_dark.is_some(),
            "light-dark target data evidence should be present"
        );
        let Some(light_dark) = light_dark else {
            return;
        };
        assert_eq!(light_dark.pass_id, "light-dark-lowering");
        assert_eq!(
            light_dark.caniuse_keys,
            vec!["css-light-dark-function".to_string()]
        );
        assert_eq!(
            light_dark.source_quorum,
            vec![
                "caniuse".to_string(),
                "web-features".to_string(),
                "mdn-bcd".to_string()
            ]
        );
        assert_eq!(light_dark.last_verified, vec!["2026-07-19".to_string()]);
        assert!(!light_dark.all_resolved_targets_supported);

        let chrome_light_dark = light_dark
            .resolved_targets
            .iter()
            .find(|target| target.browser == "chrome");
        assert!(
            chrome_light_dark.is_some(),
            "chrome target evidence should be present"
        );
        let Some(chrome_light_dark) = chrome_light_dark else {
            return;
        };
        assert_eq!(chrome_light_dark.version, "122");
        assert!(!chrome_light_dark.supported);
        let light_dark_threshold = chrome_light_dark.matched_threshold.as_ref();
        assert!(
            light_dark_threshold.is_some(),
            "chrome light-dark threshold should be present"
        );
        let Some(light_dark_threshold) = light_dark_threshold else {
            return;
        };
        assert_eq!(light_dark_threshold.min_version, "123.0");
        assert_eq!(light_dark_threshold.caniuse_key, "css-light-dark-function");

        let color_mix = chrome_122
            .target_data_evidence
            .iter()
            .find(|evidence| evidence.support_table == "color_mix");
        assert!(
            color_mix.is_some(),
            "color-mix target data evidence should be present"
        );
        let Some(color_mix) = color_mix else {
            return;
        };
        assert!(color_mix.all_resolved_targets_supported);
        let chrome_color_mix = color_mix
            .resolved_targets
            .iter()
            .find(|target| target.browser == "chrome");
        assert!(
            chrome_color_mix.is_some(),
            "chrome target evidence should be present"
        );
        let Some(chrome_color_mix) = chrome_color_mix else {
            return;
        };
        assert!(chrome_color_mix.supported);
        let color_mix_threshold = chrome_color_mix.matched_threshold.as_ref();
        assert!(
            color_mix_threshold.is_some(),
            "chrome color-mix threshold should be present"
        );
        let Some(color_mix_threshold) = color_mix_threshold else {
            return;
        };
        assert_eq!(color_mix_threshold.min_version, "111.0");
        assert_eq!(color_mix_threshold.caniuse_key, "css-color-mix");

        let color_function = chrome_122
            .target_data_evidence
            .iter()
            .find(|evidence| evidence.support_table == "color_function");
        assert!(
            color_function.is_some(),
            "color() target data evidence should be present"
        );
        let Some(color_function) = color_function else {
            return;
        };
        assert_eq!(color_function.pass_id, "color-function-lowering");
        assert_eq!(
            color_function.caniuse_keys,
            vec!["css-color-function".to_string()]
        );
        assert!(color_function.all_resolved_targets_supported);
        let chrome_color_function = color_function
            .resolved_targets
            .iter()
            .find(|target| target.browser == "chrome");
        assert!(
            chrome_color_function.is_some(),
            "chrome color() target evidence should be present"
        );
        let Some(chrome_color_function) = chrome_color_function else {
            return;
        };
        assert!(chrome_color_function.supported);
        let color_function_threshold = chrome_color_function.matched_threshold.as_ref();
        assert!(
            color_function_threshold.is_some(),
            "chrome color() threshold should be present"
        );
        let Some(color_function_threshold) = color_function_threshold else {
            return;
        };
        assert_eq!(color_function_threshold.min_version, "111.0");
        assert_eq!(color_function_threshold.caniuse_key, "css-color-function");

        let css_nesting = chrome_122
            .target_data_evidence
            .iter()
            .find(|evidence| evidence.support_table == "css_nesting");
        assert!(
            css_nesting.is_some(),
            "css nesting target data evidence should be present"
        );
        let Some(css_nesting) = css_nesting else {
            return;
        };
        assert_eq!(css_nesting.pass_id, "nesting-unwrap");
        assert_eq!(css_nesting.caniuse_keys, vec!["css-nesting".to_string()]);
        assert!(css_nesting.all_resolved_targets_supported);
        let chrome_css_nesting = css_nesting
            .resolved_targets
            .iter()
            .find(|target| target.browser == "chrome");
        assert!(
            chrome_css_nesting.is_some(),
            "chrome nesting target evidence should be present"
        );
        let Some(chrome_css_nesting) = chrome_css_nesting else {
            return;
        };
        assert!(chrome_css_nesting.supported);
        let css_nesting_threshold = chrome_css_nesting.matched_threshold.as_ref();
        assert!(
            css_nesting_threshold.is_some(),
            "chrome nesting threshold should be present"
        );
        let Some(css_nesting_threshold) = css_nesting_threshold else {
            return;
        };
        assert_eq!(css_nesting_threshold.min_version, "120.0");
        assert_eq!(css_nesting_threshold.caniuse_key, "css-nesting");

        let cascade_layers = chrome_122
            .target_data_evidence
            .iter()
            .find(|evidence| evidence.support_table == "cascade_layers");
        assert!(
            cascade_layers.is_some(),
            "cascade layers target data evidence should be present"
        );
        let Some(cascade_layers) = cascade_layers else {
            return;
        };
        assert_eq!(cascade_layers.pass_id, "layer-flatten");
        assert_eq!(
            cascade_layers.caniuse_keys,
            vec!["css-cascade-layers".to_string()]
        );
        assert!(cascade_layers.all_resolved_targets_supported);
        let chrome_cascade_layers = cascade_layers
            .resolved_targets
            .iter()
            .find(|target| target.browser == "chrome");
        assert!(
            chrome_cascade_layers.is_some(),
            "chrome cascade layers target evidence should be present"
        );
        let Some(chrome_cascade_layers) = chrome_cascade_layers else {
            return;
        };
        assert!(chrome_cascade_layers.supported);
        let cascade_layers_threshold = chrome_cascade_layers.matched_threshold.as_ref();
        assert!(
            cascade_layers_threshold.is_some(),
            "chrome cascade layers threshold should be present"
        );
        let Some(cascade_layers_threshold) = cascade_layers_threshold else {
            return;
        };
        assert_eq!(cascade_layers_threshold.min_version, "99.0");
        assert_eq!(cascade_layers_threshold.caniuse_key, "css-cascade-layers");

        let css_scope = chrome_122
            .target_data_evidence
            .iter()
            .find(|evidence| evidence.support_table == "css_scope");
        assert!(
            css_scope.is_some(),
            "css scope target data evidence should be present"
        );
        let Some(css_scope) = css_scope else {
            return;
        };
        assert_eq!(css_scope.pass_id, "scope-flatten");
        assert_eq!(
            css_scope.caniuse_keys,
            vec!["css-cascade-scope".to_string()]
        );
        assert!(css_scope.all_resolved_targets_supported);
        let chrome_css_scope = css_scope
            .resolved_targets
            .iter()
            .find(|target| target.browser == "chrome");
        assert!(
            chrome_css_scope.is_some(),
            "chrome scope target evidence should be present"
        );
        let Some(chrome_css_scope) = chrome_css_scope else {
            return;
        };
        assert!(chrome_css_scope.supported);
        let css_scope_threshold = chrome_css_scope.matched_threshold.as_ref();
        assert!(
            css_scope_threshold.is_some(),
            "chrome scope threshold should be present"
        );
        let Some(css_scope_threshold) = css_scope_threshold else {
            return;
        };
        assert_eq!(css_scope_threshold.min_version, "118.0");
        assert_eq!(css_scope_threshold.caniuse_key, "css-cascade-scope");
    }

    #[test]
    fn resolved_multi_target_queries_fold_to_the_least_supported_feature_set() {
        let mixed_targets = plan_target_transforms_from_query(
            "chrome 123, safari 16.2",
            conservative_target_options(),
        );

        assert_eq!(mixed_targets.profile_id, "browserslist-resolved");
        assert_eq!(
            mixed_targets.resolved_targets,
            vec!["chrome 123", "safari 16.2"]
        );
        assert!(
            !mixed_targets.support.supports_light_dark,
            "safari 16.2 keeps the multi-target set below the light-dark threshold"
        );
        assert!(mixed_targets.support.supports_color_mix);
        assert!(!mixed_targets.support.supports_css_nesting);
        assert!(
            mixed_targets
                .transform_plan
                .required_pass_ids
                .contains(&"light-dark-lowering")
        );
        assert!(
            !mixed_targets
                .transform_plan
                .required_pass_ids
                .contains(&"color-mix-lowering")
        );
        assert!(
            mixed_targets
                .transform_plan
                .required_pass_ids
                .contains(&"nesting-unwrap")
        );
    }

    #[test]
    fn invalid_target_query_uses_conservative_profile_without_claiming_recognition() {
        let plan = plan_target_transforms_from_query("yuru 1.0", conservative_target_options());

        assert!(!plan.recognized_profile);
        assert_eq!(plan.profile_id, "unknown-conservative");
        assert!(plan.resolution_error.is_some());
        assert!(plan.support.vendor_prefix_required);
        assert!(
            plan.transform_plan
                .required_pass_ids
                .contains(&"vendor-prefixing")
        );
        assert!(
            plan.transform_plan
                .blocked_pass_ids
                .contains(&"scope-flatten")
        );
    }

    #[test]
    fn browser_data_contract_rejects_stale_threshold_entries() {
        let mut browser_data = super::browser_threshold_data().clone();
        browser_data.thresholds[0].last_verified = "2026-05-01".to_string();

        assert_eq!(super::browser_threshold_stale_entry_count(&browser_data), 1);
        assert!(!super::browser_threshold_data_is_valid(&browser_data));

        let contract =
            super::target_data_contract_summary(&browser_data, super::pass_feature_binding_data());
        assert_eq!(contract.stale_entry_count, 1);
        assert!(!contract.valid);
    }

    #[test]
    fn browser_data_contract_rejects_unresolvable_threshold_queries() {
        let mut browser_data = super::browser_threshold_data().clone();
        browser_data.thresholds[0].browser = "android".to_string();
        browser_data.thresholds[0].min_major = 148;
        browser_data.thresholds[0].min_minor = 0;

        assert_eq!(super::unresolvable_threshold_query_count(&browser_data), 1);
        assert!(!super::browser_threshold_data_is_valid(&browser_data));

        let contract =
            super::target_data_contract_summary(&browser_data, super::pass_feature_binding_data());
        assert_eq!(contract.unresolvable_threshold_query_count, 1);
        assert!(!contract.valid);
    }

    #[test]
    fn browser_data_contract_requires_three_source_quorum_minimum() {
        let mut browser_data = super::browser_threshold_data().clone();
        browser_data.quorum_min_sources = 2;

        assert!(!super::browser_threshold_data_is_valid(&browser_data));

        let contract =
            super::target_data_contract_summary(&browser_data, super::pass_feature_binding_data());
        assert_eq!(contract.quorum_min_sources, 2);
        assert!(!contract.quorum_valid);
        assert!(!contract.valid);
    }

    #[test]
    fn browser_data_contract_rejects_incomplete_threshold_source_quorum() {
        let mut browser_data = super::browser_threshold_data().clone();
        browser_data.thresholds[0].source_quorum =
            vec!["caniuse".to_string(), "web-features".to_string()];

        assert!(!super::browser_threshold_data_is_valid(&browser_data));

        let contract =
            super::target_data_contract_summary(&browser_data, super::pass_feature_binding_data());
        assert!(!contract.quorum_valid);
        assert!(!contract.valid);
    }

    #[test]
    fn browser_data_contract_rejects_threshold_source_policy_drift() {
        let mut browser_data = super::browser_threshold_data().clone();
        browser_data.threshold_source_policy = "manualThresholdSelection".to_string();

        assert!(!super::browser_threshold_data_is_valid(&browser_data));

        let contract =
            super::target_data_contract_summary(&browser_data, super::pass_feature_binding_data());
        assert_eq!(contract.threshold_source_policy, "manualThresholdSelection");
        assert!(!contract.quorum_valid);
        assert!(!contract.valid);
    }

    #[test]
    fn browser_data_contract_rejects_resolver_provenance_drift() {
        let browser_data = super::browser_threshold_data().clone();
        let mut bindings = super::pass_feature_binding_data().clone();
        bindings.caniuse_resolver_cargo_version = "0.0.0".to_string();

        assert!(!super::resolver_provenance_is_valid(
            &browser_data,
            &bindings
        ));

        let contract = super::target_data_contract_summary(&browser_data, &bindings);
        assert!(!contract.resolver_provenance_valid);
        assert!(!contract.valid);
    }

    #[test]
    fn browser_data_contract_rejects_unmapped_threshold_tables() {
        let mut browser_data = super::browser_threshold_data().clone();
        browser_data
            .thresholds
            .push(super::BrowserFeatureThresholdV0 {
                table: "unmapped_feature".to_string(),
                browser: "chrome".to_string(),
                min_major: 123,
                min_minor: 0,
                caniuse_key: "css-unmapped-feature".to_string(),
                source_quorum: vec![
                    "caniuse".to_string(),
                    "web-features".to_string(),
                    "mdn-bcd".to_string(),
                ],
                last_verified: browser_data.refreshed_at.clone(),
            });
        let bindings = super::pass_feature_binding_data().clone();

        assert_eq!(
            super::unmapped_threshold_table_count(&browser_data, &bindings),
            1
        );
        assert!(super::browser_threshold_data_is_valid(&browser_data));
        assert!(!super::pass_feature_binding_data_is_valid(
            &browser_data,
            &bindings
        ));

        let contract = super::target_data_contract_summary(&browser_data, &bindings);
        assert_eq!(contract.unmapped_threshold_table_count, 1);
        assert!(!contract.valid);
    }
}