use caldav_sync::Config;
use caldav_sync::minicaldav_client::RealCalDavClient;
use caldav_sync::event::Event;
use chrono::{DateTime, Utc, Duration};
use tokio;
use std::path::PathBuf;

/// Test basic CRUD operations on the import calendar using the test configuration
#[tokio::test]
async fn test_create_update_delete_event() -> Result<(), Box<dyn std::error::Error>> {
    println!("🧪 Starting CRUD test with import calendar...");
    
    // Load test configuration
    let config_path = PathBuf::from("config-test-import.toml");
    let config = Config::from_file(&config_path)?;
    
    // Validate configuration
    config.validate()?;
    
    // Create CalDAV client for target server (Nextcloud)
    let import_config = config.get_import_config().ok_or("No import configuration found")?;
    let target_client = RealCalDavClient::new(
        &import_config.target_server.url,
        &import_config.target_server.username,
        &import_config.target_server.password,
    ).await?;
    
    // Build target calendar URL
    let target_calendar_url = format!("{}/", import_config.target_server.url.trim_end_matches('/'));
    
    // Validate target calendar
    let is_valid = target_client.validate_target_calendar(&target_calendar_url).await?;
    assert!(is_valid, "Target calendar should be accessible");
    println!("✅ Target calendar is accessible");
    
    // Create test event for today
    let now = Utc::now();
    let today_start = now.date_naive().and_hms_opt(10, 0, 0).unwrap().and_utc();
    let today_end = today_start + Duration::hours(1);
    
    let test_uid = format!("test-event-{}", now.timestamp());
    let mut test_event = Event::new(
        format!("Test Event {}", test_uid),
        today_start,
        today_end,
    );
    test_event.uid = test_uid.clone();
    test_event.description = Some("This is a test event for CRUD operations".to_string());
    test_event.location = Some("Test Location".to_string());
    
    println!("📝 Creating test event: {}", test_event.summary);
    
    // Convert event to iCalendar format
    let ical_data = test_event.to_ical()?;
    
    // Test 1: Create event
    let create_result = target_client.put_event(
        &target_calendar_url,
        &test_uid,
        &ical_data,
        None // No ETag for creation
    ).await;
    
    match create_result {
        Ok(_) => println!("✅ Event created successfully"),
        Err(e) => {
            println!("❌ Failed to create event: {}", e);
            return Err(e.into());
        }
    }
    
    // Wait a moment to ensure the event is processed
    tokio::time::sleep(tokio::time::Duration::from_millis(500)).await;
    
    // Test 2: Verify event exists
    println!("🔍 Verifying event exists...");
    let etag_result = target_client.get_event_etag(&target_calendar_url, &test_uid).await;
    
    let original_etag = match etag_result {
        Ok(Some(etag)) => {
            println!("✅ Event verified, ETag: {}", etag);
            etag
        }
        Ok(None) => {
            println!("❌ Event not found after creation");
            return Err("Event not found after creation".into());
        }
        Err(e) => {
            println!("❌ Failed to verify event: {}", e);
            return Err(e.into());
        }
    };
    
    // Test 3: Update event (change date to tomorrow)
    println!("📝 Updating event for tomorrow...");
    let tomorrow_start = today_start + Duration::days(1);
    let tomorrow_end = tomorrow_start + Duration::hours(1);
    
    test_event.start = tomorrow_start;
    test_event.end = tomorrow_end;
    test_event.summary = format!("Test Event {} (Updated for Tomorrow)", test_uid);
    test_event.description = Some("This event has been updated to tomorrow".to_string());
    test_event.sequence += 1; // Increment sequence for update
    
    // Convert updated event to iCalendar format
    let updated_ical_data = test_event.to_ical()?;
    
    let update_result = target_client.put_event(
        &target_calendar_url,
        &test_uid,
        &updated_ical_data,
        Some(&original_etag) // Use ETag for update
    ).await;
    
    match update_result {
        Ok(_) => println!("✅ Event updated successfully"),
        Err(e) => {
            println!("❌ Failed to update event: {}", e);
            return Err(e.into());
        }
    }
    
    // Wait a moment to ensure the update is processed
    tokio::time::sleep(tokio::time::Duration::from_millis(500)).await;
    
    // Test 4: Verify event was updated (ETag should change)
    println!("🔍 Verifying event update...");
    let new_etag_result = target_client.get_event_etag(&target_calendar_url, &test_uid).await;
    
    match new_etag_result {
        Ok(Some(new_etag)) => {
            if new_etag != original_etag {
                println!("✅ Event updated, new ETag: {}", new_etag);
            } else {
                println!("⚠️  Event ETag didn't change after update");
            }
        }
        Ok(None) => {
            println!("❌ Event not found after update");
            return Err("Event not found after update".into());
        }
        Err(e) => {
            println!("❌ Failed to verify updated event: {}", e);
            return Err(e.into());
        }
    }
    
    // Test 5: Delete event
    println!("🗑️  Deleting event...");
    let delete_result = target_client.delete_event(
        &target_calendar_url,
        &test_uid,
        None // No ETag for deletion (let server handle it)
    ).await;
    
    match delete_result {
        Ok(_) => println!("✅ Event deleted successfully"),
        Err(e) => {
            println!("❌ Failed to delete event: {}", e);
            return Err(e.into());
        }
    }
    
    // Wait a moment to ensure the deletion is processed
    tokio::time::sleep(tokio::time::Duration::from_millis(500)).await;
    
    // Test 6: Verify event was deleted
    println!("🔍 Verifying event deletion...");
    let final_check = target_client.get_event_etag(&target_calendar_url, &test_uid).await;
    
    match final_check {
        Ok(None) => {
            println!("✅ Event successfully deleted");
        }
        Ok(Some(etag)) => {
            println!("❌ Event still exists after deletion, ETag: {}", etag);
            return Err("Event still exists after deletion".into());
        }
        Err(e) => {
            // Check if it's a 404 error, which indicates successful deletion
            if e.to_string().contains("404") || e.to_string().contains("Not Found") {
                println!("✅ Event successfully deleted (confirmed by 404)");
            } else {
                println!("❌ Failed to verify deletion: {}", e);
                return Err(e.into());
            }
        }
    }
    
    println!("🎉 All CRUD operations completed successfully!");
    Ok(())
}

/// Test HTTP error handling by attempting to delete a non-existent event
#[tokio::test]
async fn test_delete_nonexistent_event() -> Result<(), Box<dyn std::error::Error>> {
    println!("🧪 Testing deletion of non-existent event...");
    
    // Load test configuration
    let config_path = PathBuf::from("config-test-import.toml");
    let config = Config::from_file(&config_path)?;
    
    // Create CalDAV client for target server
    let import_config = config.get_import_config().ok_or("No import configuration found")?;
    let target_client = RealCalDavClient::new(
        &import_config.target_server.url,
        &import_config.target_server.username,
        &import_config.target_server.password,
    ).await?;
    
    // Build target calendar URL
    let target_calendar_url = format!("{}/", import_config.target_server.url.trim_end_matches('/'));
    
    // Try to delete a non-existent event
    let fake_uid = "non-existent-event-12345";
    println!("🗑️  Testing deletion of non-existent event: {}", fake_uid);
    
    let delete_result = target_client.delete_event(
        &target_calendar_url,
        fake_uid,
        None
    ).await;
    
    match delete_result {
        Ok(_) => {
            println!("✅ Non-existent event deletion handled gracefully (idempotent)");
            Ok(())
        }
        Err(e) => {
            println!("❌ Failed to handle non-existent event deletion gracefully: {}", e);
            Err(e.into())
        }
    }
}

/// Test event existence checking
#[tokio::test]
async fn test_event_existence_check() -> Result<(), Box<dyn std::error::Error>> {
    println!("🧪 Testing event existence check...");
    
    // Load test configuration
    let config_path = PathBuf::from("config-test-import.toml");
    let config = Config::from_file(&config_path)?;
    
    // Create CalDAV client for target server
    let import_config = config.get_import_config().ok_or("No import configuration found")?;
    let target_client = RealCalDavClient::new(
        &import_config.target_server.url,
        &import_config.target_server.username,
        &import_config.target_server.password,
    ).await?;
    
    // Build target calendar URL
    let target_calendar_url = format!("{}/", import_config.target_server.url.trim_end_matches('/'));
    
    // Test non-existent event
    let fake_uid = "non-existent-event-67890";
    let fake_event_url = format!("{}{}.ics", target_calendar_url, fake_uid);
    
    println!("🔍 Testing existence check for non-existent event: {}", fake_uid);
    
    let existence_result = target_client.check_event_exists(&fake_event_url).await;
    
    match existence_result {
        Ok(_) => {
            println!("❌ Non-existent event reported as existing");
            Err("Non-existent event reported as existing".into())
        }
        Err(e) => {
            println!("✅ Non-existent event correctly reported as missing: {}", e);
            Ok(())
        }
    }
}