//! Anthropic フィクスチャベースの統合テスト
//!
//! 記録されたAPIレスポンスを使ってイベントパースをテストする

use std::fs::File;
use std::io::{BufRead, BufReader};
use std::path::Path;

use worker_types::{BlockType, DeltaContent, Event, ResponseStatus};

/// フィクスチャファイルからEventを読み込む
fn load_events_from_fixture(path: impl AsRef<Path>) -> Vec<Event> {
    let file = File::open(path).expect("Failed to open fixture file");
    let reader = BufReader::new(file);
    let mut lines = reader.lines();

    // 最初の行はメタデータ、スキップ
    let _metadata = lines.next().expect("Empty fixture file").unwrap();

    // 残りはイベント
    let mut events = Vec::new();
    for line in lines {
        let line = line.unwrap();
        if line.is_empty() {
            continue;
        }

        // RecordedEvent構造体をパース
        let recorded: serde_json::Value = serde_json::from_str(&line).unwrap();
        let data = recorded["data"].as_str().unwrap();

        // data フィールドからEventをデシリアライズ
        let event: Event = serde_json::from_str(data).unwrap();
        events.push(event);
    }

    events
}

/// フィクスチャディレクトリからanthropic_*ファイルを検索
fn find_anthropic_fixtures() -> Vec<std::path::PathBuf> {
    let fixtures_dir = Path::new(env!("CARGO_MANIFEST_DIR")).join("tests/fixtures");

    if !fixtures_dir.exists() {
        return Vec::new();
    }

    std::fs::read_dir(&fixtures_dir)
        .unwrap()
        .filter_map(|e| e.ok())
        .map(|e| e.path())
        .filter(|p| {
            p.file_name()
                .and_then(|n| n.to_str())
                .is_some_and(|n| n.starts_with("anthropic_") && n.ends_with(".jsonl"))
        })
        .collect()
}

#[test]
fn test_fixture_events_deserialize() {
    let fixtures = find_anthropic_fixtures();
    assert!(!fixtures.is_empty(), "No anthropic fixtures found");

    for fixture_path in fixtures {
        println!("Testing fixture: {:?}", fixture_path);
        let events = load_events_from_fixture(&fixture_path);

        assert!(!events.is_empty(), "Fixture should contain events");

        // 各イベントが正しくデシリアライズされているか確認
        for event in &events {
            // Debugトレイトで出力可能か確認
            let _ = format!("{:?}", event);
        }

        println!("  Loaded {} events", events.len());
    }
}

#[test]
fn test_fixture_event_sequence() {
    let fixtures = find_anthropic_fixtures();
    if fixtures.is_empty() {
        println!("No fixtures found, skipping test");
        return;
    }

    // 最初のフィクスチャをテスト
    let events = load_events_from_fixture(&fixtures[0]);

    // 期待されるイベントシーケンスを検証
    // Usage -> BlockStart -> BlockDelta -> BlockStop -> Usage -> Status

    // 最初のUsageイベント
    assert!(
        matches!(&events[0], Event::Usage(_)),
        "First event should be Usage"
    );

    // BlockStartイベント
    if let Event::BlockStart(start) = &events[1] {
        assert_eq!(start.block_type, BlockType::Text);
        assert_eq!(start.index, 0);
    } else {
        panic!("Second event should be BlockStart");
    }

    // BlockDeltaイベント
    if let Event::BlockDelta(delta) = &events[2] {
        assert_eq!(delta.index, 0);
        if let DeltaContent::Text(text) = &delta.delta {
            assert!(!text.is_empty(), "Delta text should not be empty");
            println!("  Text content: {}", text);
        } else {
            panic!("Delta should be Text");
        }
    } else {
        panic!("Third event should be BlockDelta");
    }

    // BlockStopイベント
    if let Event::BlockStop(stop) = &events[3] {
        assert_eq!(stop.block_type, BlockType::Text);
        assert_eq!(stop.index, 0);
    } else {
        panic!("Fourth event should be BlockStop");
    }

    // 最後のStatusイベント
    if let Event::Status(status) = events.last().unwrap() {
        assert_eq!(status.status, ResponseStatus::Completed);
    } else {
        panic!("Last event should be Status(Completed)");
    }
}

#[test]
fn test_fixture_usage_tokens() {
    let fixtures = find_anthropic_fixtures();
    if fixtures.is_empty() {
        println!("No fixtures found, skipping test");
        return;
    }

    let events = load_events_from_fixture(&fixtures[0]);

    // Usageイベントを収集
    let usage_events: Vec<_> = events
        .iter()
        .filter_map(|e| {
            if let Event::Usage(u) = e {
                Some(u)
            } else {
                None
            }
        })
        .collect();

    assert!(
        !usage_events.is_empty(),
        "Should have at least one Usage event"
    );

    // 最後のUsageイベントはトークン数を持つはず
    let last_usage = usage_events.last().unwrap();
    assert!(last_usage.input_tokens.is_some());
    assert!(last_usage.output_tokens.is_some());
    assert!(last_usage.total_tokens.is_some());

    println!(
        "  Token usage: {} input, {} output, {} total",
        last_usage.input_tokens.unwrap(),
        last_usage.output_tokens.unwrap(),
        last_usage.total_tokens.unwrap()
    );
}

#[test]
fn test_fixture_with_timeline() {
    use std::sync::{Arc, Mutex};
    use worker::{Handler, TextBlockEvent, TextBlockKind, Timeline};

    let fixtures = find_anthropic_fixtures();
    if fixtures.is_empty() {
        println!("No fixtures found, skipping test");
        return;
    }

    let events = load_events_from_fixture(&fixtures[0]);

    // テスト用ハンドラー
    struct TestCollector {
        texts: Arc<Mutex<Vec<String>>>,
    }

    impl Handler<TextBlockKind> for TestCollector {
        type Scope = String;

        fn on_event(&mut self, buffer: &mut String, event: &TextBlockEvent) {
            match event {
                TextBlockEvent::Start(_) => {}
                TextBlockEvent::Delta(text) => buffer.push_str(text),
                TextBlockEvent::Stop(_) => {
                    let text = std::mem::take(buffer);
                    self.texts.lock().unwrap().push(text);
                }
            }
        }
    }

    let collected = Arc::new(Mutex::new(Vec::new()));
    let mut timeline = Timeline::new();
    timeline.on_text_block(TestCollector {
        texts: collected.clone(),
    });

    // フィクスチャからのイベントをTimelineにディスパッチ
    for event in &events {
        timeline.dispatch(event);
    }

    // テキストが収集されたことを確認
    let texts = collected.lock().unwrap();
    assert_eq!(texts.len(), 1, "Should have collected one text block");
    assert!(!texts[0].is_empty(), "Collected text should not be empty");
    println!("  Collected text: {}", texts[0]);
}