xchecker-utils 1.1.0

use chrono::{DateTime, Utc};
use serde::{Deserialize, Serialize};
use std::collections::HashMap;

// Re-export lock types for use in status output
pub use crate::lock::{DriftPair, LockDrift};

/// Phase identifiers for the spec generation workflow.
///
/// `PhaseId` represents the different phases in xchecker's spec generation pipeline.
/// Phases execute in a defined order with dependencies between them.
///
/// # Phase Order
///
/// The standard workflow progresses through phases in this order:
///
/// ```text
/// Requirements → Design → Tasks → Review → Fixup → Final
/// ```
///
/// # Dependencies
///
/// - `Requirements`: No dependencies (starting phase)
/// - `Design`: Requires `Requirements` to complete successfully
/// - `Tasks`: Requires `Design` to complete successfully
/// - `Review`: Requires `Tasks` to complete successfully
/// - `Fixup`: Requires `Review` to complete successfully
/// - `Final`: Requires `Fixup` to complete successfully
///
/// # Example
///
/// ```rust
/// use xchecker_utils::types::PhaseId;
///
/// let phase = PhaseId::Requirements;
/// assert_eq!(phase.as_str(), "requirements");
///
/// // PhaseId is Copy, so it can be used multiple times
/// let phase2 = phase;
/// assert_eq!(phase, phase2);
/// ```
///
/// # Serialization
///
/// `PhaseId` serializes to its string representation (e.g., `"requirements"`, `"design"`).
#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash, Serialize, Deserialize)]
pub enum PhaseId {
    /// Requirements phase: transforms rough ideas into structured EARS requirements.
    Requirements,
    /// Design phase: creates architecture and component design from requirements.
    Design,
    /// Tasks phase: generates actionable implementation tasks from design.
    Tasks,
    /// Review phase: validates and refines the generated artifacts.
    Review,
    /// Fixup phase: applies code changes proposed by the LLM.
    Fixup,
    /// Final phase: completes the workflow and generates final artifacts.
    Final,
}

impl PhaseId {
    /// Returns the string representation of the phase.
    ///
    /// This is the canonical lowercase name used in receipts, status output,
    /// and CLI commands.
    ///
    /// # Example
    ///
    /// ```rust
    /// use xchecker_utils::types::PhaseId;
    ///
    /// assert_eq!(PhaseId::Requirements.as_str(), "requirements");
    /// assert_eq!(PhaseId::Design.as_str(), "design");
    /// assert_eq!(PhaseId::Tasks.as_str(), "tasks");
    /// ```
    #[must_use]
    pub const fn as_str(&self) -> &'static str {
        match self {
            Self::Requirements => "requirements",
            Self::Design => "design",
            Self::Tasks => "tasks",
            Self::Review => "review",
            Self::Fixup => "fixup",
            Self::Final => "final",
        }
    }
}

/// Priority levels for content selection in packet building
#[derive(Debug, Clone, Copy, PartialEq, Eq, PartialOrd, Ord, Serialize, Deserialize)]
pub enum Priority {
    /// Upstream *.core.yaml files - never evicted
    Upstream,
    /// High priority files (SPEC/ADR/REPORT)
    High,
    /// Medium priority files (README/SCHEMA)
    Medium,
    /// Low priority files (misc)
    Low,
}

/// File types for canonicalization and processing
#[derive(Debug, Clone, Copy, PartialEq, Eq, Serialize, Deserialize)]
pub enum FileType {
    Yaml,
    Markdown,
    Text,
}

impl FileType {
    /// Determine file type from extension
    #[must_use]
    pub fn from_extension(ext: &str) -> Self {
        match ext.to_lowercase().as_str() {
            "yaml" | "yml" => Self::Yaml,
            "md" | "markdown" => Self::Markdown,
            _ => Self::Text,
        }
    }
}

/// Permission modes for Claude CLI tool usage
#[derive(Debug, Clone, Copy, PartialEq, Eq, Serialize, Deserialize)]
pub enum PermissionMode {
    /// Plan mode - show what would be done
    Plan,
    /// Auto mode - automatically approve tool usage
    Auto,
    /// Block mode - block all tool usage
    Block,
}

impl PermissionMode {
    #[must_use]
    pub const fn as_str(&self) -> &'static str {
        match self {
            Self::Plan => "plan",
            Self::Auto => "auto",
            Self::Block => "block",
        }
    }
}

/// Output formats supported by Claude CLI
#[derive(Debug, Clone, Copy, PartialEq, Eq, Serialize, Deserialize)]
pub enum OutputFormat {
    /// Structured JSON streaming format (preferred)
    StreamJson,
    /// Plain text format (fallback)
    Text,
}

impl OutputFormat {
    #[must_use]
    pub const fn as_str(&self) -> &'static str {
        match self {
            Self::StreamJson => "stream-json",
            Self::Text => "text",
        }
    }
}

/// Runner modes for cross-platform Claude CLI execution.
pub use xchecker_runner::RunnerMode;

/// LLM metadata for receipts (wires ClaudeResponse fields into receipts)
#[derive(Debug, Clone, Serialize, Deserialize, PartialEq)]
pub struct LlmInfo {
    #[serde(skip_serializing_if = "Option::is_none")]
    pub provider: Option<String>,
    #[serde(skip_serializing_if = "Option::is_none")]
    pub model_used: Option<String>,
    #[serde(skip_serializing_if = "Option::is_none")]
    pub tokens_input: Option<u64>,
    #[serde(skip_serializing_if = "Option::is_none")]
    pub tokens_output: Option<u64>,
    #[serde(skip_serializing_if = "Option::is_none")]
    pub timed_out: Option<bool>,
    #[serde(skip_serializing_if = "Option::is_none")]
    pub timeout_seconds: Option<u64>,
    #[serde(skip_serializing_if = "Option::is_none")]
    pub budget_exhausted: Option<bool>,
}

impl LlmInfo {
    /// Create an LlmInfo for budget exhaustion errors
    ///
    /// This is used when an LLM invocation fails due to budget exhaustion,
    /// allowing us to record the budget_exhausted flag in the receipt even
    /// though there's no successful LlmResult.
    #[must_use]
    pub fn for_budget_exhaustion() -> Self {
        Self {
            provider: None,
            model_used: None,
            tokens_input: None,
            tokens_output: None,
            timed_out: None,
            timeout_seconds: None,
            budget_exhausted: Some(true),
        }
    }
}

/// Enhanced receipt structure for multi-file support and full auditability
/// Records comprehensive information about phase execution including Claude CLI details
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct Receipt {
    /// Schema version for this receipt format
    pub schema_version: String,
    /// RFC3339 UTC timestamp when the receipt was emitted
    pub emitted_at: DateTime<Utc>,
    /// Unique identifier for the spec being processed
    pub spec_id: String,
    /// Phase that was executed
    pub phase: String,
    /// Version of xchecker that generated this receipt
    pub xchecker_version: String,
    /// Version of Claude CLI that was used
    pub claude_cli_version: String,
    /// Full model name that was actually used
    pub model_full_name: String,
    /// Model alias that was requested (if any)
    pub model_alias: Option<String>,
    /// Version of the canonicalization algorithm used
    pub canonicalization_version: String,
    /// Backend used for canonicalization (e.g., "jcs-rfc8785")
    pub canonicalization_backend: String,
    /// CLI flags and configuration used
    pub flags: HashMap<String, String>,
    /// Runner mode used for Claude CLI execution ("native" | "wsl")
    pub runner: String,
    /// WSL distribution name if runner is "wsl"
    pub runner_distro: Option<String>,
    /// Evidence of packet construction
    pub packet: PacketEvidence,
    /// BLAKE3 hashes of canonicalized outputs (sorted by path before emission)
    pub outputs: Vec<FileHash>,
    /// Exit code from the phase execution (0 = success)
    pub exit_code: i32,
    /// Error kind for non-zero exits
    pub error_kind: Option<ErrorKind>,
    /// Brief error reason for non-zero exits
    pub error_reason: Option<String>,
    /// Standard error tail (limited to 2 KiB)
    pub stderr_tail: Option<String>,
    /// Redacted standard error output (limited to 2 KiB)
    pub stderr_redacted: Option<String>,
    /// Warnings encountered during execution
    pub warnings: Vec<String>,
    /// Whether fallback to text format was used
    pub fallback_used: Option<bool>,
    /// Diff context lines (0 when --unidiff-zero is enabled)
    pub diff_context: Option<u32>,
    /// LLM metadata for receipts (V11+ multi-provider support)
    pub llm: Option<LlmInfo>,
    /// Pipeline configuration metadata (V11+)
    pub pipeline: Option<PipelineInfo>,
}

/// Error kinds for receipt error tracking
#[derive(Debug, Clone, Serialize, Deserialize, PartialEq, Eq)]
#[serde(rename_all = "snake_case")]
#[cfg_attr(any(test, feature = "test-utils"), derive(strum::VariantNames))]
pub enum ErrorKind {
    CliArgs,
    PacketOverflow,
    SecretDetected,
    LockHeld,
    PhaseTimeout,
    ClaudeFailure,
    Unknown,
}

/// Evidence of packet construction for auditability
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct PacketEvidence {
    /// List of files included in the packet
    pub files: Vec<FileEvidence>,
    /// Maximum bytes allowed in packet
    pub max_bytes: usize,
    /// Maximum lines allowed in packet
    pub max_lines: usize,
}

/// Evidence of a single file's inclusion in the packet
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct FileEvidence {
    /// Path to the file relative to project root
    pub path: String,
    /// Optional range of lines included (e.g., "L1-L80")
    pub range: Option<String>,
    /// BLAKE3 hash of the file content before redaction
    pub blake3_pre_redaction: String,
    /// Priority level of this file
    pub priority: Priority,
}

/// Represents a file hash in the receipt
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct FileHash {
    /// Path to the file relative to the spec directory
    pub path: String,
    /// BLAKE3 hash of the canonicalized content
    pub blake3_canonicalized: String,
}

/// Status output for a spec, matching `schemas/status.v1.json`.
///
/// `StatusOutput` provides comprehensive status information about a spec's current state,
/// including artifacts, configuration, and any detected drift from locked values.
///
/// This is a stable public type. Changes in 1.x releases are additive only.
///
/// # Schema
///
/// This type conforms to `schemas/status.v1.json` and is emitted using JCS (RFC 8785)
/// canonicalization for stable, deterministic JSON output.
///
/// # Example
///
/// ```rust
/// use chrono::Utc;
/// use std::collections::BTreeMap;
/// use xchecker_utils::types::{ConfigValue, StatusOutput};
///
/// let status = StatusOutput {
///     schema_version: "1".to_string(),
///     emitted_at: Utc::now(),
///     runner: "native".to_string(),
///     runner_distro: None,
///     fallback_used: false,
///     canonicalization_version: "yaml-v1,md-v1".to_string(),
///     canonicalization_backend: "jcs-rfc8785".to_string(),
///     artifacts: Vec::new(),
///     last_receipt_path: "receipts/latest.json".to_string(),
///     effective_config: BTreeMap::<String, ConfigValue>::new(),
///     lock_drift: None,
///     pending_fixups: None,
/// };
///
/// println!("Schema version: {}", status.schema_version);
/// println!("Artifacts: {}", status.artifacts.len());
/// ```
///
/// # Fields
///
/// - `schema_version`: Always `"1"` for this schema version
/// - `emitted_at`: RFC3339 UTC timestamp when status was generated
/// - `runner`: Execution mode (`"native"` or `"wsl"`)
/// - `artifacts`: List of artifacts with BLAKE3 hashes (first 8 chars)
/// - `effective_config`: Configuration values with source attribution
/// - `lock_drift`: Detected differences from locked values (if any)
/// - `pending_fixups`: Summary of pending code changes (if any)
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct StatusOutput {
    /// Schema version for this status format (always `"1"` for v1).
    pub schema_version: String,
    /// RFC3339 UTC timestamp when the status was emitted.
    pub emitted_at: DateTime<Utc>,
    /// Runner mode used for Claude CLI execution (`"native"` or `"wsl"`).
    pub runner: String,
    /// WSL distribution name if runner is `"wsl"`.
    pub runner_distro: Option<String>,
    /// Whether fallback to text format was used during LLM invocation.
    pub fallback_used: bool,
    /// Version of the canonicalization algorithm used (e.g., `"yaml-v1,md-v1"`).
    pub canonicalization_version: String,
    /// Backend used for canonicalization (e.g., `"jcs-rfc8785"`).
    pub canonicalization_backend: String,
    /// Artifacts with path and `blake3_first8` hash (sorted by path).
    pub artifacts: Vec<ArtifactInfo>,
    /// Path to the most recent receipt file.
    pub last_receipt_path: String,
    /// Effective configuration with source attribution (`cli`, `config`, `programmatic`, or `default`).
    pub effective_config: std::collections::BTreeMap<String, ConfigValue>,
    /// Lock drift information if lockfile exists and drift is detected.
    pub lock_drift: Option<LockDrift>,
    /// Pending fixup summary (counts only, no file contents).
    #[serde(skip_serializing_if = "Option::is_none")]
    pub pending_fixups: Option<PendingFixupsSummary>,
}

/// Doctor output structure for JSON emission (schema v1)
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct DoctorOutput {
    /// Schema version for this doctor format
    pub schema_version: String,
    /// RFC3339 UTC timestamp when the doctor output was emitted
    pub emitted_at: DateTime<Utc>,
    /// Overall health status (true if all checks pass or warn, false if any fail)
    pub ok: bool,
    /// Health checks performed (sorted by name before emission)
    pub checks: Vec<DoctorCheck>,
    /// Cache statistics (wired from InsightCache)
    #[serde(skip_serializing_if = "Option::is_none")]
    pub cache_stats: Option<crate::cache::CacheStats>,
}

/// Individual health check result
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct DoctorCheck {
    /// Name of the check
    pub name: String,
    /// Status of the check
    pub status: CheckStatus,
    /// Details about the check result
    pub details: String,
}

/// Status of a health check
#[derive(Debug, Clone, Serialize, Deserialize, PartialEq, Eq)]
#[serde(rename_all = "snake_case")]
#[cfg_attr(any(test, feature = "test-utils"), derive(strum::VariantNames))]
pub enum CheckStatus {
    Pass,
    Warn,
    Fail,
}

/// Artifact information for status output.
///
/// Represents a single artifact file with its path and truncated BLAKE3 hash.
/// Used in [`StatusOutput`] to list all artifacts for a spec.
///
/// # Example
///
/// ```rust
/// use xchecker_utils::types::ArtifactInfo;
///
/// let artifact = ArtifactInfo {
///     path: "artifacts/00-requirements.md".to_string(),
///     blake3_first8: "a1b2c3d4".to_string(),
/// };
/// ```
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct ArtifactInfo {
    /// Path to the artifact relative to the spec directory.
    pub path: String,
    /// First 8 characters of the BLAKE3 hash of the canonicalized content.
    pub blake3_first8: String,
}

/// Configuration value with source attribution.
///
/// Tracks both the value and where it came from (CLI, config file, programmatic, or defaults).
/// Used in [`StatusOutput`] to show effective configuration.
///
/// # Example
///
/// ```rust
/// use xchecker_utils::types::{ConfigValue, ConfigSource};
/// use serde_json::json;
///
/// let config_value = ConfigValue {
///     value: json!("haiku"),
///     source: ConfigSource::Config,
/// };
/// ```
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct ConfigValue {
    /// The configuration value as arbitrary JSON.
    pub value: serde_json::Value,
    /// Source of this configuration value.
    pub source: ConfigSource,
}

/// Source of a configuration value.
///
/// Indicates where a configuration value originated from in the precedence chain:
/// CLI arguments > environment variables > config file > programmatic overrides > built-in defaults.
///
/// # Serialization
///
/// Serializes to lowercase strings: `"cli"`, `"env"`, `"config"`, `"programmatic"`, `"default"`.
///
/// # Example
///
/// ```rust
/// use xchecker_utils::types::ConfigSource;
///
/// let source = ConfigSource::Cli;
/// let json = serde_json::to_string(&source).unwrap();
/// assert_eq!(json, r#""cli""#);
/// ```
#[derive(Debug, Clone, Serialize, Deserialize, PartialEq, Eq)]
#[serde(rename_all = "lowercase")]
#[cfg_attr(any(test, feature = "test-utils"), derive(strum::VariantNames))]
pub enum ConfigSource {
    /// Value provided via CLI argument (highest precedence).
    Cli,
    /// Value loaded from environment variable.
    Env,
    /// Value loaded from configuration file.
    Config,
    /// Value provided programmatically (e.g., `Config::builder()`).
    Programmatic,
    /// Built-in default value (lowest precedence).
    Default,
}

/// Pending fixups summary (counts only, no file contents or diffs)
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct PendingFixupsSummary {
    /// Number of target files with pending fixups
    pub targets: u32,
    /// Estimated number of lines to be added
    pub est_added: u32,
    /// Estimated number of lines to be removed
    pub est_removed: u32,
}

/// Pipeline configuration metadata (V11+)
/// All fields are optional for backward compatibility
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct PipelineInfo {
    /// Execution strategy used ("controlled" | "external_tool")
    pub execution_strategy: Option<String>,
}

/// Spec output structure for JSON emission (schema spec-json.v1)
/// Used by `xchecker spec --json` command for Claude Code integration
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct SpecOutput {
    /// Schema version for this spec format (e.g., "spec-json.v1")
    pub schema_version: String,
    /// Unique identifier for the spec
    pub spec_id: String,
    /// List of phases with high-level metadata
    pub phases: Vec<PhaseInfo>,
    /// Configuration summary (paths, execution strategy, provider)
    pub config_summary: SpecConfigSummary,
}

/// Phase information for spec output (high-level metadata only)
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct PhaseInfo {
    /// Phase identifier
    pub phase_id: String,
    /// Phase status: "completed", "pending", "not_started"
    pub status: String,
    /// RFC3339 UTC timestamp of last run (if any)
    #[serde(skip_serializing_if = "Option::is_none")]
    pub last_run: Option<DateTime<Utc>>,
}

/// Configuration summary for spec output
/// Excludes full artifacts and packet contents per FR-Claude Code-CLI requirements
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct SpecConfigSummary {
    /// Execution strategy used ("controlled" | "external_tool")
    pub execution_strategy: String,
    /// LLM provider configured
    #[serde(skip_serializing_if = "Option::is_none")]
    pub provider: Option<String>,
    /// Spec directory path
    pub spec_path: String,
}

/// Status output structure for JSON emission (schema status-json.v2)
/// Used by `xchecker status --json` command for Claude Code integration
/// Includes artifacts with blake3_first8, effective_config, and lock_drift
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct StatusJsonOutput {
    /// Schema version for this status format (e.g., "status-json.v2")
    pub schema_version: String,
    /// Unique identifier for the spec
    pub spec_id: String,
    /// List of phase statuses with receipt IDs
    pub phase_statuses: Vec<PhaseStatusInfo>,
    /// Number of pending fixups (0 if none)
    pub pending_fixups: u32,
    /// Whether any errors exist in the spec
    pub has_errors: bool,
    /// Whether strict validation mode is enabled (validation failures fail phases)
    pub strict_validation: bool,
    /// Artifacts with path and blake3_first8 hash (first 8 chars of BLAKE3)
    #[serde(skip_serializing_if = "Vec::is_empty", default)]
    pub artifacts: Vec<ArtifactInfo>,
    /// Effective configuration with source attribution (cli/config/programmatic/default)
    #[serde(skip_serializing_if = "std::collections::BTreeMap::is_empty", default)]
    pub effective_config: std::collections::BTreeMap<String, ConfigValue>,
    /// Lock drift information if lockfile exists and drift detected
    #[serde(skip_serializing_if = "Option::is_none")]
    pub lock_drift: Option<LockDrift>,
}

/// Phase status information for compact status output
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct PhaseStatusInfo {
    /// Phase identifier
    pub phase_id: String,
    /// Phase status: "success", "failed", "not_started"
    pub status: String,
    /// Receipt ID for the latest run (if any)
    #[serde(skip_serializing_if = "Option::is_none")]
    pub receipt_id: Option<String>,
}

/// Resume output structure for JSON emission (schema resume-json.v1)
/// Used by `xchecker resume --json` command for Claude Code integration
/// Per FR-Claude Code-CLI (Requirements 4.1.3): Returns resume context without full packet/artifacts
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct ResumeJsonOutput {
    /// Schema version for this resume format (e.g., "resume-json.v1")
    pub schema_version: String,
    /// Unique identifier for the spec
    pub spec_id: String,
    /// Phase to resume from
    pub phase: String,
    /// Current inputs available for the phase (artifact names, not full contents)
    pub current_inputs: CurrentInputs,
    /// Next steps hint for the user/agent
    pub next_steps: String,
}

/// Current inputs available for a phase (high-level metadata only)
/// Excludes full packet and raw artifacts per FR-Claude Code-CLI requirements
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct CurrentInputs {
    /// List of available artifact names (not full contents)
    #[serde(skip_serializing_if = "Vec::is_empty", default)]
    pub available_artifacts: Vec<String>,
    /// Whether the spec directory exists
    pub spec_exists: bool,
    /// Latest completed phase (if any)
    #[serde(skip_serializing_if = "Option::is_none")]
    pub latest_completed_phase: Option<String>,
}

/// Workspace status output structure for JSON emission (schema workspace-status-json.v1)
/// Used by `xchecker project status --json` command for aggregated workspace status
/// Per FR-WORKSPACE (Requirements 4.3.4): Emits aggregated status for all specs
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct WorkspaceStatusJsonOutput {
    /// Schema version for this workspace status format (e.g., "workspace-status-json.v1")
    pub schema_version: String,
    /// Name of the workspace
    pub workspace_name: String,
    /// Path to the workspace file
    pub workspace_path: String,
    /// Per-spec phase summaries
    pub specs: Vec<WorkspaceSpecStatus>,
    /// Summary counts
    pub summary: WorkspaceStatusSummary,
}

/// Per-spec status information for workspace status output
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct WorkspaceSpecStatus {
    /// Spec identifier
    pub spec_id: String,
    /// Tags associated with the spec
    #[serde(skip_serializing_if = "Vec::is_empty", default)]
    pub tags: Vec<String>,
    /// Overall spec status: "success", "failed", "pending", "not_started", "stale"
    pub status: String,
    /// Latest completed phase (if any)
    #[serde(skip_serializing_if = "Option::is_none")]
    pub latest_phase: Option<String>,
    /// RFC3339 UTC timestamp of last activity (if any)
    #[serde(skip_serializing_if = "Option::is_none")]
    pub last_activity: Option<DateTime<Utc>>,
    /// Number of pending fixups for this spec
    pub pending_fixups: u32,
    /// Whether this spec has errors
    pub has_errors: bool,
}

/// Summary counts for workspace status
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct WorkspaceStatusSummary {
    /// Total number of specs in the workspace
    pub total_specs: u32,
    /// Number of specs with successful latest phase
    pub successful_specs: u32,
    /// Number of specs with failed latest phase
    pub failed_specs: u32,
    /// Number of specs with pending work (not completed all phases)
    pub pending_specs: u32,
    /// Number of specs that haven't been started
    pub not_started_specs: u32,
    /// Number of stale specs (no recent activity)
    pub stale_specs: u32,
}

/// Workspace history output structure for JSON emission (schema workspace-history-json.v1)
/// Used by `xchecker project history <spec-id> --json` command for spec timeline
/// Per FR-WORKSPACE (Requirements 4.3.5): Emits timeline of phase progression
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct WorkspaceHistoryJsonOutput {
    /// Schema version for this workspace history format (e.g., "workspace-history-json.v1")
    pub schema_version: String,
    /// Spec identifier
    pub spec_id: String,
    /// Timeline of phase executions
    pub timeline: Vec<HistoryEntry>,
    /// Aggregated metrics across all executions
    pub metrics: HistoryMetrics,
}

/// A single entry in the spec history timeline
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct HistoryEntry {
    /// Phase that was executed
    pub phase: String,
    /// RFC3339 UTC timestamp of execution
    pub timestamp: DateTime<Utc>,
    /// Exit code of the execution (0 = success)
    pub exit_code: i32,
    /// Whether the execution was successful
    pub success: bool,
    /// LLM token usage for this execution (if available)
    #[serde(skip_serializing_if = "Option::is_none")]
    pub tokens_input: Option<u64>,
    /// LLM token output for this execution (if available)
    #[serde(skip_serializing_if = "Option::is_none")]
    pub tokens_output: Option<u64>,
    /// Number of fixups applied in this execution (if applicable)
    #[serde(skip_serializing_if = "Option::is_none")]
    pub fixup_count: Option<u32>,
    /// Model used for this execution
    #[serde(skip_serializing_if = "Option::is_none")]
    pub model: Option<String>,
    /// Provider used for this execution
    #[serde(skip_serializing_if = "Option::is_none")]
    pub provider: Option<String>,
}

/// Aggregated metrics for spec history
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct HistoryMetrics {
    /// Total number of phase executions
    pub total_executions: u32,
    /// Number of successful executions
    pub successful_executions: u32,
    /// Number of failed executions
    pub failed_executions: u32,
    /// Total LLM tokens consumed (input)
    pub total_tokens_input: u64,
    /// Total LLM tokens consumed (output)
    pub total_tokens_output: u64,
    /// Total fixups applied across all executions
    pub total_fixups: u32,
    /// First execution timestamp (if any)
    #[serde(skip_serializing_if = "Option::is_none")]
    pub first_execution: Option<DateTime<Utc>>,
    /// Last execution timestamp (if any)
    #[serde(skip_serializing_if = "Option::is_none")]
    pub last_execution: Option<DateTime<Utc>>,
}