use anyhow::{Context, Result};
use momentry_core::core::db::{Database, PostgresDb, QdrantDb};
use momentry_core::Embedder;
use std::env;
use std::time::Instant;

#[derive(Debug)]
struct SearchComparison {
    query: String,
    bm25_results: usize,
    qdrant_results: usize,
    bm25_top_score: f32,
    qdrant_top_score: f32,
    bm25_time_ms: u128,
    qdrant_time_ms: u128,
    overlap_count: usize,
}

fn print_results(
    query: &str,
    bm25_results: &[momentry_core::core::db::postgres_db::Bm25Result],
    qdrant_results: &[momentry_core::core::db::SearchResult],
    limit: usize,
) {
    println!("\n=== 查詢: '{}' ===", query);
    println!(
        "BM25 結果 (共 {} 筆，顯示前 {} 筆):",
        bm25_results.len(),
        limit.min(bm25_results.len())
    );
    for (i, r) in bm25_results.iter().take(limit).enumerate() {
        println!(
            "  {}. {} (uuid: {}, chunk_id: {})",
            i + 1,
            r.text.chars().take(60).collect::<String>(),
            r.uuid,
            r.chunk_id
        );
        println!(
            "     分數: {:.4}, 時間: {:.1}-{:.1}s, 類型: {}",
            r.bm25_score, r.start_time, r.end_time, r.chunk_type
        );
    }

    println!(
        "\nQdrant 向量搜尋結果 (共 {} 筆，顯示前 {} 筆):",
        qdrant_results.len(),
        limit.min(qdrant_results.len())
    );
    for (i, r) in qdrant_results.iter().take(limit).enumerate() {
        println!("  {}. uuid: {}, chunk_id: {}", i + 1, r.uuid, r.chunk_id);
        println!("     分數: {:.4}", r.score);
    }

    // 計算重疊
    let bm25_ids: Vec<String> = bm25_results
        .iter()
        .map(|r| format!("{}-{}", r.uuid, r.chunk_id))
        .collect();
    let qdrant_ids: Vec<String> = qdrant_results
        .iter()
        .map(|r| format!("{}-{}", r.uuid, r.chunk_id))
        .collect();

    let overlap: Vec<&String> = bm25_ids
        .iter()
        .filter(|id| qdrant_ids.contains(id))
        .collect();

    println!(
        "\n結果重疊: {}/{} (BM25 與 Qdrant 共同返回)",
        overlap.len(),
        bm25_results.len().max(qdrant_results.len())
    );
    if !overlap.is_empty() {
        println!("重疊的 chunk IDs: {:?}", overlap);
    }
}

#[tokio::main]
async fn main() -> Result<()> {
    // 設定環境變數
    env::set_var("RUST_LOG", "info");
    env::set_var("QDRANT_URL", "http://localhost:6333");
    env::set_var("QDRANT_API_KEY", "Test3200Test3200Test3200");
    env::set_var("QDRANT_COLLECTION", "momentry_rule1");

    println!("=== BM25 與 Qdrant 搜尋比較測試 ===\n");

    // 初始化元件
    println!("初始化元件...");
    let embedder = Embedder::new("nomic-embed-text-v2-moe:latest".to_string());
    let pg = PostgresDb::init()
        .await
        .context("Failed to initialize PostgreSQL database")?;
    let qdrant = QdrantDb::new();

    // 測試查詢清單
    let test_queries = vec![
        // 英文查詢
        ("telephone", Some("384b0ff44aaaa1f1")), // Charade 電影
        ("money", Some("384b0ff44aaaa1f1")),
        ("gold", Some("384b0ff44aaaa1f1")),
        // 中文查詢
        ("工作", Some("9760d0820f0cf9a7")), // ExaSAN 影片
        ("加快速度", Some("9760d0820f0cf9a7")),
        ("聲音", Some("9760d0820f0cf9a7")),
        // 全域查詢（無 uuid 限制）
        ("computer", None),
        ("technology", None),
    ];

    let limit = 10;
    let mut comparisons = Vec::new();

    for (query_str, uuid_opt) in test_queries {
        let query = query_str.to_string();
        let uuid = uuid_opt.map(|s| s.to_string());

        println!(
            "\n🔍 測試查詢: '{}' {}",
            query,
            uuid_opt
                .map(|u| format!("(uuid: {})", u))
                .unwrap_or_default()
        );

        // BM25 搜尋
        let bm25_start = Instant::now();
        let bm25_results = pg.search_bm25(&query, uuid_opt, limit).await?;
        let bm25_time = bm25_start.elapsed();

        // Qdrant 向量搜尋
        let qdrant_start = Instant::now();
        let query_vector = embedder.embed_query(&query).await?;
        let qdrant_results = if let Some(ref uuid) = uuid {
            qdrant.search_in_uuid(&query_vector, uuid, limit).await?
        } else {
            qdrant.search(&query_vector, limit).await?
        };
        let qdrant_time = qdrant_start.elapsed();

        // 計算重疊
        let bm25_ids: Vec<String> = bm25_results
            .iter()
            .map(|r| format!("{}-{}", r.uuid, r.chunk_id))
            .collect();
        let qdrant_ids: Vec<String> = qdrant_results
            .iter()
            .map(|r| format!("{}-{}", r.uuid, r.chunk_id))
            .collect();

        let overlap_count = bm25_ids.iter().filter(|id| qdrant_ids.contains(id)).count();

        // 儲存比較結果
        let comparison = SearchComparison {
            query: query.clone(),
            bm25_results: bm25_results.len(),
            qdrant_results: qdrant_results.len(),
            bm25_top_score: bm25_results.first().map(|r| r.bm25_score).unwrap_or(0.0),
            qdrant_top_score: qdrant_results.first().map(|r| r.score).unwrap_or(0.0),
            bm25_time_ms: bm25_time.as_millis(),
            qdrant_time_ms: qdrant_time.as_millis(),
            overlap_count,
        };
        comparisons.push(comparison);

        // 顯示詳細結果
        print_results(&query, &bm25_results, &qdrant_results, 5);

        // 顯示效能比較
        println!("\n⏱️  效能比較:");
        println!("  BM25 搜尋時間: {}ms", bm25_time.as_millis());
        println!(
            "  Qdrant 搜尋時間: {}ms (含向量嵌入時間)",
            qdrant_time.as_millis()
        );
    }

    // 顯示總結比較表
    println!("\n📊 搜尋比較總結");
    println!(
        "{:<15} {:<6} {:<6} {:<8} {:<8} {:<6} {:<6} {:<6}",
        "查詢", "BM25數", "QD數", "BM25分", "QD分", "BM25ms", "QDms", "重疊"
    );
    println!("{}", "-".repeat(80));

    for comp in &comparisons {
        println!(
            "{:<15} {:<6} {:<6} {:<8.4} {:<8.4} {:<6} {:<6} {:<6}/{}",
            &comp.query[..15.min(comp.query.len())],
            comp.bm25_results,
            comp.qdrant_results,
            comp.bm25_top_score,
            comp.qdrant_top_score,
            comp.bm25_time_ms,
            comp.qdrant_time_ms,
            comp.overlap_count,
            comp.bm25_results.max(comp.qdrant_results)
        );
    }

    // 分析統計
    let total_queries = comparisons.len();
    let bm25_faster = comparisons
        .iter()
        .filter(|c| c.bm25_time_ms < c.qdrant_time_ms)
        .count();
    let avg_overlap = comparisons
        .iter()
        .map(|c| c.overlap_count as f32 / c.bm25_results.max(c.qdrant_results).max(1) as f32)
        .sum::<f32>()
        / total_queries as f32
        * 100.0;

    println!("\n📈 統計分析:");
    println!("  • 總測試查詢數: {}", total_queries);
    println!(
        "  • BM25 較快的查詢: {}/{} ({:.1}%)",
        bm25_faster,
        total_queries,
        bm25_faster as f32 / total_queries as f32 * 100.0
    );
    println!("  • 平均結果重疊率: {:.1}%", avg_overlap);

    Ok(())
}