use anyhow::Result;
use filetree_hybrid::HybridRouter;
use std::time::Instant;

fn main() -> Result<()> {
    println!("=== Hybrid Architecture POC Test ===\n");

    let user_id = "test_hybrid";

    println!("Step 1: Initialize Hybrid database...");
    let start = Instant::now();
    let router = HybridRouter::init_user_db(user_id)?;
    let init_time = start.elapsed();
    println!("  ✓ Init time: {:?}", init_time);

    println!("\nStep 2: Insert 1,000 nodes (dual-write)...");
    let nodes: Vec<filetree_hybrid::FileNode> = (0..1000)
        .map(|i| HybridRouter::new_folder(&format!("folder_{}", i), None))
        .collect();

    let start = Instant::now();
    for node in &nodes {
        router.insert_node(node)?;
    }
    let single_insert_time = start.elapsed();
    let single_throughput = nodes.len() as f64 / single_insert_time.as_secs_f64();
    println!("  ✓ Single insert: {:?}", single_insert_time);
    println!("  ✓ Throughput: {:.2} nodes/sec", single_throughput);

    println!("\nStep 3: Insert 10,000 nodes (batch dual-write)...");
    let nodes_batch: Vec<filetree_hybrid::FileNode> = (0..10000)
        .map(|i| HybridRouter::new_folder(&format!("batch_folder_{}", i), None))
        .collect();

    let start = Instant::now();
    router.insert_node_batch(&nodes_batch)?;
    let batch_insert_time = start.elapsed();
    let batch_throughput = nodes_batch.len() as f64 / batch_insert_time.as_secs_f64();
    println!("  ✓ Batch insert: {:?}", batch_insert_time);
    println!("  ✓ Throughput: {:.2} nodes/sec", batch_throughput);

    println!("\nStep 4: Query node (cache hit test)...");
    let test_node_id = &nodes_batch[5000].node_id;

    println!("  First query (cache miss, SQLite query):");
    let start = Instant::now();
    let node1 = router.get_node(test_node_id)?;
    let query1_time = start.elapsed();
    println!("    ✓ Query time: {:?}", query1_time);
    println!("    ✓ Found: {}", node1.is_some());

    println!("  Second query (cache hit, Sled cache):");
    let start = Instant::now();
    let node2 = router.get_node(test_node_id)?;
    let query2_time = start.elapsed();
    println!("    ✓ Query time: {:?}", query2_time);
    println!("    ✓ Found: {}", node2.is_some());
    println!(
        "    ✓ Speedup: {:.2}x",
        query1_time.as_nanos() as f64 / query2_time.as_nanos() as f64
    );

    println!("\nStep 5: Get children (SQLite query)...");
    let parent_id = &nodes[0].node_id;
    let start = Instant::now();
    let children = router.get_children(parent_id)?;
    let children_time = start.elapsed();
    println!("  ✓ Query time: {:?}", children_time);
    println!("  ✓ Children count: {}", children.len());

    println!("\nStep 6: Cache metrics...");
    let metrics = router.get_metrics();
    println!("  ✓ Cache hits: {}", metrics.cache_hits);
    println!("  ✓ Cache misses: {}", metrics.cache_misses);
    println!("  ✓ Hit rate: {:.2}%", metrics.hit_rate() * 100.0);
    println!("  ✓ Avg cache latency: {:?}", metrics.avg_cache_latency);
    println!("  ✓ Avg SQLite latency: {:?}", metrics.avg_sqlite_latency);

    println!("\nStep 7: Database sizes...");
    let sqlite_count = router.count_nodes()?;
    let sled_count = router.cache_size()?;
    println!("  ✓ SQLite nodes: {}", sqlite_count);
    println!("  ✓ Sled cache entries: {}", sled_count);

    let db_path = HybridRouter::user_db_path(user_id);
    let sqlite_path = format!("{}.sqlite", db_path);
    let sled_path = format!("{}.sled", db_path);

    let sqlite_size = std::fs::metadata(&sqlite_path)?.len();
    let sled_size = get_directory_size(&sled_path)?;
    println!(
        "  ✓ SQLite size: {:.2} MB",
        sqlite_size as f64 / 1024.0 / 1024.0
    );
    println!(
        "  ✓ Sled size: {:.2} MB",
        sled_size as f64 / 1024.0 / 1024.0
    );
    println!(
        "  ✓ Total size: {:.2} MB",
        (sqlite_size + sled_size) as f64 / 1024.0 / 1024.0
    );

    println!("\n=== Performance Summary ===");
    println!(
        "Single insert: {:?} ({:.2} nodes/sec)",
        single_insert_time, single_throughput
    );
    println!(
        "Batch insert: {:?} ({:.2} nodes/sec)",
        batch_insert_time, batch_throughput
    );
    println!("Query cache miss: {:?}", query1_time);
    println!("Query cache hit: {:?}", query2_time);
    println!(
        "Cache speedup: {:.2}x",
        query1_time.as_nanos() as f64 / query2_time.as_nanos() as f64
    );
    println!("Cache hit rate: {:.2}%", metrics.hit_rate() * 100.0);

    println!("\nStep 8: Cleanup...");
    std::fs::remove_file(&sqlite_path)?;
    std::fs::remove_dir_all(&sled_path)?;
    println!("  ✓ Test database removed");

    println!("\n✅ Hybrid POC Test completed successfully!");

    Ok(())
}

fn get_directory_size(path: &str) -> Result<u64> {
    let mut total_size = 0;
    for entry in std::fs::read_dir(path)? {
        let entry = entry?;
        let metadata = entry.metadata()?;
        if metadata.is_file() {
            total_size += metadata.len();
        } else if metadata.is_dir() {
            total_size += get_directory_size(entry.path().to_str().unwrap())?;
        }
    }
    Ok(total_size)
}