victauri_core/

codegen.rs

//! Test code generation from recorded sessions.
//!
//! Converts a [`RecordedSession`] into a self-contained Rust test file that
//! replays DOM interactions through the `VictauriClient` API and optionally
//! asserts on IPC outcomes and state transitions.

use chrono::Utc;

use crate::event::{AppEvent, InteractionKind, IpcResult};
use crate::recording::RecordedSession;

/// Controls whether generated code uses direct client methods or the Locator API.
#[derive(Debug, Clone, Copy, Eq, PartialEq, Default)]
pub enum CodegenStyle {
    /// Generate `client.click_by_id("btn")` style calls.
    #[default]
    Direct,
    /// Generate `Locator::css("#btn").click(&mut client)` style calls.
    Locator,
}

/// Options for controlling test code generation.
#[derive(Debug, Clone, Eq, PartialEq)]
pub struct CodegenOptions {
    /// Name of the generated test function.
    pub test_name: String,
    /// Whether to include IPC assertions after interactions.
    pub include_ipc_assertions: bool,
    /// Whether to include state verification assertions.
    pub include_state_checks: bool,
    /// Whether to add timing comments showing relative timestamps.
    pub include_timing_comments: bool,
    /// Whether to emit `assert_ipc_called` lines instead of just comments.
    pub emit_ipc_assert_calls: bool,
    /// API style: direct client calls or Locator-based.
    pub style: CodegenStyle,
}

impl Default for CodegenOptions {
    fn default() -> Self {
        Self {
            test_name: "recorded_flow".to_string(),
            include_ipc_assertions: true,
            include_state_checks: true,
            include_timing_comments: true,
            emit_ipc_assert_calls: false,
            style: CodegenStyle::Direct,
        }
    }
}

/// Generates a Rust test file from a recorded session using default options.
///
/// This is a convenience wrapper around [`generate_test`] with
/// [`CodegenOptions::default()`].
#[must_use]
pub fn generate_test_default(session: &RecordedSession) -> String {
    generate_test(session, &CodegenOptions::default())
}

/// Generates a Rust test file from a recorded session.
///
/// Converts DOM interactions into `VictauriClient` API calls and IPC events
/// into verification assertions. The generated test is self-contained and
/// can be run with `cargo test`.
#[must_use]
pub fn generate_test(session: &RecordedSession, options: &CodegenOptions) -> String {
    let mut out = String::with_capacity(2048);

    // File header
    let date = Utc::now().format("%Y-%m-%d");
    out.push_str(&format!("// Generated by victauri record -- {date}\n"));
    out.push_str(&format!("// Session: {}\n", session.id));

    // Imports depend on style
    match options.style {
        CodegenStyle::Direct => {
            out.push_str("\nuse victauri_test::VictauriClient;\n");
            if options.emit_ipc_assert_calls {
                out.push_str("use victauri_test::assert_ipc_called;\n");
            }
        }
        CodegenStyle::Locator => {
            out.push_str("\nuse victauri_test::prelude::*;\n");
        }
    }
    out.push('\n');

    // Test function
    out.push_str("#[tokio::test]\n");
    out.push_str(&format!("async fn {}() {{\n", options.test_name));
    out.push_str(
        "    let mut client = VictauriClient::discover().await.expect(\"connect to Tauri app\");\n",
    );

    let session_start = session.started_at;
    let mut ipc_commands_seen: Vec<String> = Vec::new();

    for (i, recorded) in session.events.iter().enumerate() {
        // Timing comment: elapsed since session start, only when gap > 500ms
        if options.include_timing_comments {
            let elapsed_ms = recorded
                .timestamp
                .signed_duration_since(session_start)
                .num_milliseconds();

            let show_timing = if i == 0 {
                elapsed_ms > 500
            } else {
                let prev_ts = session.events[i - 1].timestamp;
                let gap_ms = recorded
                    .timestamp
                    .signed_duration_since(prev_ts)
                    .num_milliseconds();
                gap_ms > 500
            };

            if show_timing {
                out.push_str(&format!("\n    // +{elapsed_ms}ms\n"));
            }
        }

        match &recorded.event {
            AppEvent::DomInteraction {
                action,
                selector,
                value,
                ..
            } => match options.style {
                CodegenStyle::Direct => {
                    emit_interaction(&mut out, action, selector, value.as_deref());
                }
                CodegenStyle::Locator => {
                    emit_locator_interaction(&mut out, action, selector, value.as_deref());
                }
            },

            AppEvent::Ipc(call) if options.include_ipc_assertions => {
                // Skip internal victauri plugin commands
                if call.command.starts_with("plugin:victauri|") {
                    continue;
                }
                if matches!(call.result, IpcResult::Ok(_)) {
                    let cmd = &call.command;
                    if options.emit_ipc_assert_calls {
                        ipc_commands_seen.push(cmd.clone());
                    }
                    out.push_str(&format!("    // IPC: {cmd} completed successfully\n"));
                }
            }

            AppEvent::StateChange { key, caused_by, .. }
                if options.include_state_checks && caused_by.is_some() =>
            {
                out.push_str(&format!("    // State changed: {key}\n"));
            }

            // DomMutation, WindowEvent, and disabled variants are skipped
            _ => {}
        }
    }

    // Emit IPC assertions at the end if enabled
    if options.emit_ipc_assert_calls && !ipc_commands_seen.is_empty() {
        out.push_str("\n    // Verify IPC calls\n");
        out.push_str("    let log = client.get_ipc_log(None).await.unwrap();\n");
        for cmd in &ipc_commands_seen {
            let escaped = escape_rust_str(cmd);
            out.push_str(&format!(
                "    assert_ipc_called(&log, \"{escaped}\");\n"
            ));
        }
    }

    out.push_str("}\n");
    out
}

/// Escapes a string for embedding in a Rust string literal.
fn escape_rust_str(s: &str) -> String {
    let mut escaped = String::with_capacity(s.len());
    for ch in s.chars() {
        match ch {
            '\\' => escaped.push_str("\\\\"),
            '"' => escaped.push_str("\\\""),
            '\n' => escaped.push_str("\\n"),
            '\r' => escaped.push_str("\\r"),
            '\t' => escaped.push_str("\\t"),
            other => escaped.push(other),
        }
    }
    escaped
}

/// Emits a DOM interaction as Locator API calls.
fn emit_locator_interaction(
    out: &mut String,
    action: &InteractionKind,
    selector: &str,
    value: Option<&str>,
) {
    let locator = selector_to_locator(selector);

    match action {
        InteractionKind::Click => {
            out.push_str(&format!(
                "    {locator}.click(&mut client).await.unwrap();\n"
            ));
        }
        InteractionKind::DoubleClick => {
            out.push_str(&format!(
                "    {locator}.double_click(&mut client).await.unwrap();\n"
            ));
        }
        InteractionKind::Fill => {
            let val = value.map_or_else(String::new, escape_rust_str);
            out.push_str(&format!(
                "    {locator}.fill(&mut client, \"{val}\").await.unwrap();\n"
            ));
        }
        InteractionKind::KeyPress => {
            let val = value.map_or_else(String::new, escape_rust_str);
            out.push_str(&format!(
                "    {locator}.press_key(&mut client, \"{val}\").await.unwrap();\n"
            ));
        }
        InteractionKind::Select => {
            let val = value.map_or_else(String::new, escape_rust_str);
            out.push_str(&format!(
                "    {locator}.select_option(&mut client, &[\"{val}\"]).await.unwrap();\n"
            ));
        }
        InteractionKind::Navigate => {
            let val = value.map_or_else(String::new, escape_rust_str);
            out.push_str(&format!("    client.navigate(\"{val}\").await.unwrap();\n"));
        }
        InteractionKind::Scroll => {
            out.push_str(&format!(
                "    {locator}.scroll_into_view(&mut client).await.unwrap();\n"
            ));
        }
    }
}

/// Converts a raw CSS selector into a Locator factory expression.
fn selector_to_locator(selector: &str) -> String {
    // :has-text("...") → Locator::text("...")
    if let Some(start) = selector.find(":has-text(\"") {
        let text_start = start + ":has-text(\"".len();
        if let Some(end) = selector[text_start..].find("\")") {
            let text = escape_rust_str(&selector[text_start..text_start + end]);
            return format!("Locator::text(\"{text}\")");
        }
    }

    // #id → Locator::css("#id")
    if selector.starts_with('#') && !selector[1..].contains(' ') {
        let escaped = escape_rust_str(selector);
        return format!("Locator::css(\"{escaped}\")");
    }

    // [data-testid="..."] → Locator::test_id("...")
    if let Some(start) = selector.find("[data-testid=\"") {
        let id_start = start + "[data-testid=\"".len();
        if let Some(end) = selector[id_start..].find("\"]") {
            let id = escape_rust_str(&selector[id_start..id_start + end]);
            return format!("Locator::test_id(\"{id}\")");
        }
    }

    // [role="..."] → Locator::role("...")
    if let Some(start) = selector.find("[role=\"") {
        let role_start = start + "[role=\"".len();
        if let Some(end) = selector[role_start..].find("\"]") {
            let role = escape_rust_str(&selector[role_start..role_start + end]);
            return format!("Locator::role(\"{role}\")");
        }
    }

    // Fallback: Locator::css("...")
    let escaped = escape_rust_str(selector);
    format!("Locator::css(\"{escaped}\")")
}

/// Resolved selector form for emitting idiomatic `VictauriClient` calls.
///
/// The JS observer produces raw CSS selectors; this classification maps them
/// to the high-level convenience methods on `VictauriClient` (`click_by_id`,
/// `click_by_text`, etc.) so generated tests read naturally.
enum ResolvedSelector {
    /// Selector started with `#` — strip the hash and use `*_by_id`.
    ById(String),
    /// Selector contained `:has-text("...")` — extract the text and use `*_by_text`.
    ByText(String),
    /// Everything else — pass the raw selector through.
    Raw(String),
}

/// Classifies a raw CSS selector into the most idiomatic `VictauriClient` form.
fn resolve_selector(selector: &str) -> ResolvedSelector {
    // Pattern 2: contains `:has-text("...")` — extract the quoted text.
    if let Some(start) = selector.find(":has-text(\"") {
        let text_start = start + ":has-text(\"".len();
        if let Some(end) = selector[text_start..].find("\")") {
            let text = &selector[text_start..text_start + end];
            return ResolvedSelector::ByText(text.to_string());
        }
    }

    // Pattern 1: starts with `#` (simple ID selector, no combinators).
    if selector.starts_with('#') && !selector[1..].contains(' ') {
        let id = &selector[1..];
        return ResolvedSelector::ById(id.to_string());
    }

    ResolvedSelector::Raw(selector.to_string())
}

/// Emits a single DOM interaction as a `VictauriClient` method call.
///
/// Selector-aware: emits `*_by_id` for `#id` selectors, `*_by_text` for
/// `:has-text("...")` selectors, and `*_by_selector` for raw CSS selectors
/// so the client resolves them to ref handles before interacting.
fn emit_interaction(
    out: &mut String,
    action: &InteractionKind,
    selector: &str,
    value: Option<&str>,
) {
    let resolved = resolve_selector(selector);

    match action {
        InteractionKind::Click => {
            emit_resolved_call(out, "click", &resolved, None);
        }
        InteractionKind::DoubleClick => {
            emit_resolved_call(out, "double_click", &resolved, None);
        }
        InteractionKind::Fill => {
            let val = value.map_or_else(String::new, escape_rust_str);
            emit_resolved_call(out, "fill", &resolved, Some(&val));
        }
        InteractionKind::KeyPress => {
            let val = value.map_or_else(String::new, escape_rust_str);
            out.push_str(&format!(
                "    client.press_key(\"{val}\").await.unwrap();\n"
            ));
        }
        InteractionKind::Select => {
            let val = value.map_or_else(String::new, escape_rust_str);
            emit_resolved_select(out, &resolved, &val);
        }
        InteractionKind::Navigate => {
            let val = value.map_or_else(String::new, escape_rust_str);
            out.push_str(&format!("    client.navigate(\"{val}\").await.unwrap();\n"));
        }
        InteractionKind::Scroll => {
            emit_resolved_scroll(out, &resolved);
        }
    }
}

/// Emits a resolved call for click-like and fill-like methods.
///
/// For `ById` selectors, emits `*_by_id`. For `ByText`, emits `*_by_text`.
/// For `Raw` CSS selectors, emits `*_by_selector` which resolves the selector
/// to a ref handle before interacting.
fn emit_resolved_call(
    out: &mut String,
    base_method: &str,
    resolved: &ResolvedSelector,
    extra_arg: Option<&str>,
) {
    let suffix = extra_arg.map_or_else(String::new, |v| format!(", \"{v}\""));
    match resolved {
        ResolvedSelector::ById(id) => {
            let escaped = escape_rust_str(id);
            out.push_str(&format!(
                "    client.{base_method}_by_id(\"{escaped}\"{suffix}).await.unwrap();\n"
            ));
        }
        ResolvedSelector::ByText(text) => {
            let escaped = escape_rust_str(text);
            out.push_str(&format!(
                "    client.{base_method}_by_text(\"{escaped}\"{suffix}).await.unwrap();\n"
            ));
        }
        ResolvedSelector::Raw(sel) => {
            let escaped = escape_rust_str(sel);
            out.push_str(&format!(
                "    client.{base_method}_by_selector(\"{escaped}\"{suffix}).await.unwrap();\n"
            ));
        }
    }
}

/// Emits a resolved `select_option` call.
///
/// For `Raw` selectors, emits `select_option_by_selector` which resolves the
/// CSS selector to a ref handle before selecting.
fn emit_resolved_select(out: &mut String, resolved: &ResolvedSelector, val: &str) {
    match resolved {
        ResolvedSelector::ById(id) => {
            let escaped = escape_rust_str(id);
            out.push_str(&format!(
                "    client.select_option_by_id(\"{escaped}\", &[\"{val}\"]).await.unwrap();\n"
            ));
        }
        ResolvedSelector::ByText(text) => {
            let escaped = escape_rust_str(text);
            out.push_str(&format!(
                "    client.select_option_by_text(\"{escaped}\", &[\"{val}\"]).await.unwrap();\n"
            ));
        }
        ResolvedSelector::Raw(sel) => {
            let escaped = escape_rust_str(sel);
            out.push_str(&format!(
                "    client.select_option_by_selector(\"{escaped}\", &[\"{val}\"]).await.unwrap();\n"
            ));
        }
    }
}

/// Emits a resolved `scroll_to` call.
///
/// For `Raw` selectors, emits `scroll_to_by_selector`. For `ById`, emits
/// `scroll_to_by_id`. For `ByText`, falls back to `scroll_to_by_selector`
/// with the original selector text (scroll has no text variant).
fn emit_resolved_scroll(out: &mut String, resolved: &ResolvedSelector) {
    match resolved {
        ResolvedSelector::ById(id) => {
            let escaped = escape_rust_str(id);
            out.push_str(&format!(
                "    client.scroll_to_by_id(\"{escaped}\").await.unwrap();\n"
            ));
        }
        ResolvedSelector::ByText(_) | ResolvedSelector::Raw(_) => {
            let sel = match resolved {
                ResolvedSelector::ByText(t) => escape_rust_str(t),
                ResolvedSelector::Raw(s) => escape_rust_str(s),
                _ => unreachable!(),
            };
            out.push_str(&format!(
                "    client.scroll_to_by_selector(\"{sel}\").await.unwrap();\n"
            ));
        }
    }
}

#[cfg(test)]
mod tests {
    use chrono::{Duration, Utc};

    use super::*;
    use crate::event::{AppEvent, InteractionKind, IpcCall, IpcResult};
    use crate::recording::{RecordedEvent, RecordedSession};

    fn make_session(events: Vec<RecordedEvent>) -> RecordedSession {
        RecordedSession {
            id: "test-session-001".to_string(),
            started_at: Utc::now(),
            events,
            checkpoints: vec![],
        }
    }

    fn interaction_event(
        index: usize,
        action: InteractionKind,
        selector: &str,
        value: Option<&str>,
        offset_ms: i64,
    ) -> RecordedEvent {
        RecordedEvent {
            index,
            timestamp: Utc::now() + Duration::milliseconds(offset_ms),
            event: AppEvent::DomInteraction {
                action,
                selector: selector.to_string(),
                value: value.map(String::from),
                timestamp: Utc::now() + Duration::milliseconds(offset_ms),
                webview_label: "main".to_string(),
            },
        }
    }

    #[test]
    fn empty_session_produces_valid_skeleton() {
        let session = make_session(vec![]);
        let code = generate_test_default(&session);

        assert!(code.contains("use victauri_test::VictauriClient;"));
        assert!(code.contains("#[tokio::test]"));
        assert!(code.contains("async fn recorded_flow()"));
        assert!(code.contains("VictauriClient::discover()"));
        assert!(code.contains("Session: test-session-001"));
    }

    #[test]
    fn click_by_id_generated_for_hash_selector() {
        let session = make_session(vec![interaction_event(
            0,
            InteractionKind::Click,
            "#submit-btn",
            None,
            0,
        )]);
        let code = generate_test_default(&session);

        assert!(
            code.contains("client.click_by_id(\"submit-btn\").await.unwrap();"),
            "expected click_by_id for # selector, got:\n{code}"
        );
    }

    #[test]
    fn fill_generates_correct_call() {
        let session = make_session(vec![interaction_event(
            0,
            InteractionKind::Fill,
            "input[name=\"email\"]",
            Some("user@example.com"),
            0,
        )]);
        let code = generate_test_default(&session);

        assert!(code.contains(
            "client.fill_by_selector(\"input[name=\\\"email\\\"]\", \"user@example.com\").await.unwrap();"
        ));
    }

    #[test]
    fn ipc_comment_included_when_enabled() {
        let session = make_session(vec![RecordedEvent {
            index: 0,
            timestamp: Utc::now(),
            event: AppEvent::Ipc(IpcCall {
                id: "c1".to_string(),
                command: "save_settings".to_string(),
                timestamp: Utc::now(),
                duration_ms: Some(10),
                result: IpcResult::Ok(serde_json::json!(true)),
                arg_size_bytes: 0,
                webview_label: "main".to_string(),
            }),
        }]);
        let code = generate_test_default(&session);

        assert!(code.contains("// IPC: save_settings completed successfully"));
    }

    #[test]
    fn internal_victauri_ipc_skipped() {
        let session = make_session(vec![RecordedEvent {
            index: 0,
            timestamp: Utc::now(),
            event: AppEvent::Ipc(IpcCall {
                id: "c2".to_string(),
                command: "plugin:victauri|get_snapshot".to_string(),
                timestamp: Utc::now(),
                duration_ms: Some(2),
                result: IpcResult::Ok(serde_json::json!({})),
                arg_size_bytes: 0,
                webview_label: "main".to_string(),
            }),
        }]);
        let code = generate_test_default(&session);

        assert!(!code.contains("plugin:victauri"));
    }

    #[test]
    fn ipc_omitted_when_disabled() {
        let session = make_session(vec![RecordedEvent {
            index: 0,
            timestamp: Utc::now(),
            event: AppEvent::Ipc(IpcCall {
                id: "c1".to_string(),
                command: "save_settings".to_string(),
                timestamp: Utc::now(),
                duration_ms: Some(10),
                result: IpcResult::Ok(serde_json::json!(true)),
                arg_size_bytes: 0,
                webview_label: "main".to_string(),
            }),
        }]);
        let opts = CodegenOptions {
            include_ipc_assertions: false,
            ..CodegenOptions::default()
        };
        let code = generate_test(&session, &opts);

        assert!(!code.contains("IPC:"));
    }

    #[test]
    fn state_change_comment_included() {
        let session = make_session(vec![RecordedEvent {
            index: 0,
            timestamp: Utc::now(),
            event: AppEvent::StateChange {
                key: "user.theme".to_string(),
                timestamp: Utc::now(),
                caused_by: Some("toggle_theme".to_string()),
            },
        }]);
        let code = generate_test_default(&session);

        assert!(code.contains("// State changed: user.theme"));
    }

    #[test]
    fn custom_test_name() {
        let session = make_session(vec![]);
        let opts = CodegenOptions {
            test_name: "my_custom_test".to_string(),
            ..CodegenOptions::default()
        };
        let code = generate_test(&session, &opts);

        assert!(code.contains("async fn my_custom_test()"));
    }

    #[test]
    fn special_chars_escaped() {
        let session = make_session(vec![interaction_event(
            0,
            InteractionKind::Fill,
            "input",
            Some("line1\nline2\ttab\"quote\\back"),
            0,
        )]);
        let code = generate_test_default(&session);

        assert!(code.contains("\\n"));
        assert!(code.contains("\\t"));
        assert!(code.contains("\\\""));
        assert!(code.contains("\\\\"));
    }

    #[test]
    fn all_interaction_kinds_generate_code() {
        let session = make_session(vec![
            interaction_event(0, InteractionKind::Click, "[data-testid=\"a\"]", None, 0),
            interaction_event(
                1,
                InteractionKind::DoubleClick,
                "[data-testid=\"b\"]",
                None,
                10,
            ),
            interaction_event(
                2,
                InteractionKind::Fill,
                "[data-testid=\"c\"]",
                Some("val"),
                20,
            ),
            interaction_event(3, InteractionKind::KeyPress, "#d", Some("Enter"), 30),
            interaction_event(
                4,
                InteractionKind::Select,
                "[data-testid=\"e\"]",
                Some("opt1"),
                40,
            ),
            interaction_event(5, InteractionKind::Navigate, "#f", Some("/page"), 50),
            interaction_event(6, InteractionKind::Scroll, "#g", None, 60),
        ]);
        let code = generate_test(
            &session,
            &CodegenOptions {
                include_timing_comments: false,
                ..CodegenOptions::default()
            },
        );

        assert!(code.contains("client.click_by_selector(\"[data-testid=\\\"a\\\"]\")"));
        assert!(code.contains("client.double_click_by_selector(\"[data-testid=\\\"b\\\"]\")"));
        assert!(code.contains("client.fill_by_selector(\"[data-testid=\\\"c\\\"]\", \"val\")"));
        assert!(code.contains("client.press_key(\"Enter\")"));
        assert!(code.contains(
            "client.select_option_by_selector(\"[data-testid=\\\"e\\\"]\", &[\"opt1\"])"
        ));
        assert!(code.contains("client.navigate(\"/page\")"));
        assert!(code.contains("client.scroll_to_by_id(\"g\")"));
    }

    #[test]
    fn dom_mutation_and_window_event_skipped() {
        let ts = Utc::now();
        let session = make_session(vec![
            RecordedEvent {
                index: 0,
                timestamp: ts,
                event: AppEvent::DomMutation {
                    webview_label: "main".to_string(),
                    timestamp: ts,
                    mutation_count: 5,
                },
            },
            RecordedEvent {
                index: 1,
                timestamp: ts,
                event: AppEvent::WindowEvent {
                    label: "main".to_string(),
                    event: "focus".to_string(),
                    timestamp: ts,
                },
            },
        ]);
        let code = generate_test_default(&session);

        // Should only have the skeleton, no interaction or assertion lines
        assert!(!code.contains("client."));
        assert!(!code.contains("// IPC:"));
        assert!(!code.contains("// State"));
    }

    #[test]
    fn default_options_are_correct() {
        let opts = CodegenOptions::default();
        assert_eq!(opts.test_name, "recorded_flow");
        assert!(opts.include_ipc_assertions);
        assert!(opts.include_state_checks);
        assert!(opts.include_timing_comments);
    }

    // --- Timing comment tests ---

    fn make_session_at(base: chrono::DateTime<Utc>, events: Vec<RecordedEvent>) -> RecordedSession {
        RecordedSession {
            id: "timing-session".to_string(),
            started_at: base,
            events,
            checkpoints: vec![],
        }
    }

    fn interaction_event_at(
        base: chrono::DateTime<Utc>,
        index: usize,
        action: InteractionKind,
        selector: &str,
        value: Option<&str>,
        offset_ms: i64,
    ) -> RecordedEvent {
        let ts = base + Duration::milliseconds(offset_ms);
        RecordedEvent {
            index,
            timestamp: ts,
            event: AppEvent::DomInteraction {
                action,
                selector: selector.to_string(),
                value: value.map(String::from),
                timestamp: ts,
                webview_label: "main".to_string(),
            },
        }
    }

    #[test]
    fn timing_comment_emitted_for_large_gap() {
        let base = Utc::now();
        let session = make_session_at(
            base,
            vec![
                interaction_event_at(base, 0, InteractionKind::Click, ".btn-a", None, 0),
                interaction_event_at(base, 1, InteractionKind::Click, ".btn-b", None, 1000),
            ],
        );
        let opts = CodegenOptions {
            include_timing_comments: true,
            ..CodegenOptions::default()
        };
        let code = generate_test(&session, &opts);

        assert!(
            code.contains("// +1000ms"),
            "expected timing comment for 1000ms gap, got:\n{code}"
        );
    }

    #[test]
    fn timing_comment_omitted_for_small_gap() {
        let base = Utc::now();
        let session = make_session_at(
            base,
            vec![
                interaction_event_at(base, 0, InteractionKind::Click, ".btn-a", None, 0),
                interaction_event_at(base, 1, InteractionKind::Click, ".btn-b", None, 200),
            ],
        );
        let opts = CodegenOptions {
            include_timing_comments: true,
            ..CodegenOptions::default()
        };
        let code = generate_test(&session, &opts);

        assert!(
            !code.contains("// +"),
            "expected no timing comment for 200ms gap, got:\n{code}"
        );
    }

    // --- Selector resolution tests ---

    #[test]
    fn id_selector_emits_click_by_id() {
        let session = make_session(vec![interaction_event(
            0,
            InteractionKind::Click,
            "#my-id",
            None,
            0,
        )]);
        let code = generate_test_default(&session);

        assert!(
            code.contains("client.click_by_id(\"my-id\").await.unwrap();"),
            "expected click_by_id, got:\n{code}"
        );
    }

    #[test]
    fn has_text_selector_emits_click_by_text() {
        let session = make_session(vec![interaction_event(
            0,
            InteractionKind::Click,
            "button:has-text(\"Submit\")",
            None,
            0,
        )]);
        let code = generate_test_default(&session);

        assert!(
            code.contains("client.click_by_text(\"Submit\").await.unwrap();"),
            "expected click_by_text, got:\n{code}"
        );
    }

    #[test]
    fn role_has_text_selector_emits_click_by_text() {
        let session = make_session(vec![interaction_event(
            0,
            InteractionKind::Click,
            "[role=\"button\"]:has-text(\"Save\")",
            None,
            0,
        )]);
        let code = generate_test_default(&session);

        assert!(
            code.contains("client.click_by_text(\"Save\").await.unwrap();"),
            "expected click_by_text for role selector, got:\n{code}"
        );
    }

    #[test]
    fn data_testid_selector_emits_click_by_selector() {
        let session = make_session(vec![interaction_event(
            0,
            InteractionKind::Click,
            "[data-testid=\"foo\"]",
            None,
            0,
        )]);
        let code = generate_test_default(&session);

        assert!(
            code.contains(
                "client.click_by_selector(\"[data-testid=\\\"foo\\\"]\").await.unwrap();"
            ),
            "expected click_by_selector for data-testid selector, got:\n{code}"
        );
    }

    #[test]
    fn fill_with_id_selector_emits_fill_by_id() {
        let session = make_session(vec![interaction_event(
            0,
            InteractionKind::Fill,
            "#email",
            Some("user@example.com"),
            0,
        )]);
        let code = generate_test_default(&session);

        assert!(
            code.contains("client.fill_by_id(\"email\", \"user@example.com\").await.unwrap();"),
            "expected fill_by_id, got:\n{code}"
        );
    }

    #[test]
    fn double_click_with_has_text_emits_by_text() {
        let session = make_session(vec![interaction_event(
            0,
            InteractionKind::DoubleClick,
            "span:has-text(\"Edit\")",
            None,
            0,
        )]);
        let code = generate_test_default(&session);

        assert!(
            code.contains("client.double_click_by_text(\"Edit\").await.unwrap();"),
            "expected double_click_by_text, got:\n{code}"
        );
    }

    #[test]
    fn select_with_id_emits_select_option_by_id() {
        let session = make_session(vec![interaction_event(
            0,
            InteractionKind::Select,
            "#country",
            Some("AU"),
            0,
        )]);
        let code = generate_test_default(&session);

        assert!(
            code.contains("client.select_option_by_id(\"country\", &[\"AU\"]).await.unwrap();"),
            "expected select_option_by_id, got:\n{code}"
        );
    }

    /// Round-trip test: builds a realistic multi-event session and verifies
    /// the generated Rust source contains valid structural elements for every
    /// event kind — click, fill, key-press, IPC, and state-change.
    #[test]
    fn round_trip_realistic_session() {
        let base = Utc::now();

        let events = vec![
            // 0: Click on #submit-btn  (should resolve to click_by_id)
            interaction_event_at(base, 0, InteractionKind::Click, "#submit-btn", None, 0),
            // 1: Fill on input[name=email]  (raw selector — should use client.fill_by_selector)
            interaction_event_at(
                base,
                1,
                InteractionKind::Fill,
                "input[name=email]",
                Some("test@example.com"),
                100,
            ),
            // 2: KeyPress "Enter"
            interaction_event_at(
                base,
                2,
                InteractionKind::KeyPress,
                "body",
                Some("Enter"),
                200,
            ),
            // 3: IPC call — save_draft completed successfully
            RecordedEvent {
                index: 3,
                timestamp: base + Duration::milliseconds(300),
                event: AppEvent::Ipc(IpcCall {
                    id: "ipc-1".to_string(),
                    command: "save_draft".to_string(),
                    timestamp: base + Duration::milliseconds(300),
                    duration_ms: Some(15),
                    result: IpcResult::Ok(serde_json::json!({"saved": true})),
                    arg_size_bytes: 42,
                    webview_label: "main".to_string(),
                }),
            },
            // 4: StateChange caused by save_draft
            RecordedEvent {
                index: 4,
                timestamp: base + Duration::milliseconds(350),
                event: AppEvent::StateChange {
                    key: "draft.status".to_string(),
                    timestamp: base + Duration::milliseconds(350),
                    caused_by: Some("save_draft".to_string()),
                },
            },
        ];

        let session = make_session_at(base, events);
        let code = generate_test(&session, &CodegenOptions::default());

        // --- Structural validity: the generated code is a well-formed async test ---
        assert!(
            code.contains("#[tokio::test]"),
            "missing #[tokio::test] attribute:\n{code}"
        );
        assert!(
            code.contains("async fn recorded_flow()"),
            "missing async fn declaration:\n{code}"
        );
        assert!(
            code.contains("VictauriClient::discover()"),
            "missing VictauriClient::discover() call:\n{code}"
        );
        assert!(
            code.ends_with("}\n"),
            "missing closing brace at end of generated code:\n{code}"
        );

        // --- Event-specific assertions ---

        // Click on #submit-btn should resolve to click_by_id (not raw click with "#submit-btn")
        assert!(
            code.contains("client.click_by_id(\"submit-btn\").await.unwrap();"),
            "expected click_by_id for #submit-btn:\n{code}"
        );
        assert!(
            !code.contains("client.click(\"#submit-btn\")"),
            "#submit-btn should NOT appear as raw client.click:\n{code}"
        );

        // Fill on input[name=email] — raw selector, should use fill_by_selector
        assert!(
            code.contains(
                "client.fill_by_selector(\"input[name=email]\", \"test@example.com\").await.unwrap();"
            ),
            "expected fill_by_selector for input[name=email]:\n{code}"
        );
        assert!(
            !code.contains("client.fill_by_id(\"input[name=email]\""),
            "input[name=email] should NOT resolve to fill_by_id:\n{code}"
        );

        // KeyPress "Enter"
        assert!(
            code.contains("client.press_key(\"Enter\").await.unwrap();"),
            "expected press_key(\"Enter\"):\n{code}"
        );

        // IPC comment for save_draft
        assert!(
            code.contains("// IPC: save_draft completed successfully"),
            "expected IPC comment for save_draft:\n{code}"
        );

        // State change comment for draft.status
        assert!(
            code.contains("// State changed: draft.status"),
            "expected state change comment for draft.status:\n{code}"
        );

        // --- Brace matching: count opening and closing braces ---
        let open_braces = code.matches('{').count();
        let close_braces = code.matches('}').count();
        assert_eq!(
            open_braces, close_braces,
            "unbalanced braces: {open_braces} open vs {close_braces} close in:\n{code}"
        );
    }

    // --- Locator style tests ---

    #[test]
    fn locator_style_click_by_id() {
        let session = make_session(vec![interaction_event(
            0,
            InteractionKind::Click,
            "#submit-btn",
            None,
            0,
        )]);
        let opts = CodegenOptions {
            style: CodegenStyle::Locator,
            include_timing_comments: false,
            ..CodegenOptions::default()
        };
        let code = generate_test(&session, &opts);

        assert!(
            code.contains("Locator::css(\"#submit-btn\").click(&mut client).await.unwrap();"),
            "expected Locator::css for id selector, got:\n{code}"
        );
        assert!(code.contains("use victauri_test::prelude::*;"));
    }

    #[test]
    fn locator_style_click_by_text() {
        let session = make_session(vec![interaction_event(
            0,
            InteractionKind::Click,
            "button:has-text(\"Save\")",
            None,
            0,
        )]);
        let opts = CodegenOptions {
            style: CodegenStyle::Locator,
            include_timing_comments: false,
            ..CodegenOptions::default()
        };
        let code = generate_test(&session, &opts);

        assert!(
            code.contains("Locator::text(\"Save\").click(&mut client).await.unwrap();"),
            "expected Locator::text for has-text, got:\n{code}"
        );
    }

    #[test]
    fn locator_style_fill_by_testid() {
        let session = make_session(vec![interaction_event(
            0,
            InteractionKind::Fill,
            "[data-testid=\"email-input\"]",
            Some("user@test.com"),
            0,
        )]);
        let opts = CodegenOptions {
            style: CodegenStyle::Locator,
            include_timing_comments: false,
            ..CodegenOptions::default()
        };
        let code = generate_test(&session, &opts);

        assert!(
            code.contains(
                "Locator::test_id(\"email-input\").fill(&mut client, \"user@test.com\").await.unwrap();"
            ),
            "expected Locator::test_id for data-testid, got:\n{code}"
        );
    }

    #[test]
    fn locator_style_role_selector() {
        let session = make_session(vec![interaction_event(
            0,
            InteractionKind::Click,
            "[role=\"button\"]",
            None,
            0,
        )]);
        let opts = CodegenOptions {
            style: CodegenStyle::Locator,
            include_timing_comments: false,
            ..CodegenOptions::default()
        };
        let code = generate_test(&session, &opts);

        assert!(
            code.contains("Locator::role(\"button\").click(&mut client).await.unwrap();"),
            "expected Locator::role for role selector, got:\n{code}"
        );
    }

    #[test]
    fn ipc_assert_calls_emitted() {
        let session = make_session(vec![RecordedEvent {
            index: 0,
            timestamp: Utc::now(),
            event: AppEvent::Ipc(IpcCall {
                id: "c1".to_string(),
                command: "save_settings".to_string(),
                timestamp: Utc::now(),
                duration_ms: Some(10),
                result: IpcResult::Ok(serde_json::json!(true)),
                arg_size_bytes: 0,
                webview_label: "main".to_string(),
            }),
        }]);
        let opts = CodegenOptions {
            emit_ipc_assert_calls: true,
            ..CodegenOptions::default()
        };
        let code = generate_test(&session, &opts);

        assert!(
            code.contains("assert_ipc_called(&log, \"save_settings\");"),
            "expected assert_ipc_called, got:\n{code}"
        );
        assert!(code.contains("use victauri_test::assert_ipc_called;"));
        assert!(code.contains("let log = client.get_ipc_log(None).await.unwrap();"));
    }

    #[test]
    fn selector_to_locator_mapping() {
        assert_eq!(selector_to_locator("#btn"), "Locator::css(\"#btn\")");
        assert_eq!(
            selector_to_locator("button:has-text(\"OK\")"),
            "Locator::text(\"OK\")"
        );
        assert_eq!(
            selector_to_locator("[data-testid=\"foo\"]"),
            "Locator::test_id(\"foo\")"
        );
        assert_eq!(
            selector_to_locator("[role=\"navigation\"]"),
            "Locator::role(\"navigation\")"
        );
        assert_eq!(
            selector_to_locator(".my-class"),
            "Locator::css(\".my-class\")"
        );
    }
}