//! 集成测试

use reqwest;
use serde_json::{json, Value};
use std::collections::HashMap;
use tokio;

const BASE_URL: &str = "http://127.0.0.1:3000";

/// 测试辅助函数：创建 HTTP 客户端
fn create_client() -> reqwest::Client {
    reqwest::Client::new()
}

/// 测试辅助函数：解析 JSON 响应
async fn parse_json_response(response: reqwest::Response) -> Result<Value, Box<dyn std::error::Error>> {
    let text = response.text().await?;
    let json: Value = serde_json::from_str(&text)?;
    Ok(json)
}

#[tokio::test]
async fn test_health_check() {
    let client = create_client();
    
    let response = client
        .get(&format!("{}/health", BASE_URL))
        .send()
        .await
        .expect("Failed to send request");

    assert_eq!(response.status(), 200);
    
    let json = parse_json_response(response).await.expect("Failed to parse JSON");
    assert_eq!(json["status"], "healthy");
    assert!(json["timestamp"].is_string());
}

#[tokio::test]
async fn test_root_endpoint() {
    let client = create_client();
    
    let response = client
        .get(&format!("{}/", BASE_URL))
        .send()
        .await
        .expect("Failed to send request");

    assert_eq!(response.status(), 200);
    
    let json = parse_json_response(response).await.expect("Failed to parse JSON");
    assert_eq!(json["message"], "欢迎使用 Rust User API");
    assert_eq!(json["version"], "0.1.0");
}

#[tokio::test]
async fn test_user_lifecycle() {
    let client = create_client();
    
    // 1. 获取初始用户列表（应该为空）
    let response = client
        .get(&format!("{}/api/users", BASE_URL))
        .send()
        .await
        .expect("Failed to get users");
    
    assert_eq!(response.status(), 200);
    let users_response = parse_json_response(response).await.expect("Failed to parse JSON");
    assert!(users_response["data"].is_array());
    assert!(users_response["pagination"].is_object());

    // 2. 创建新用户
    let user_data = json!({
        "username": "testuser_integration",
        "email": "integration@example.com",
        "password": "password123"
    });

    let response = client
        .post(&format!("{}/api/users", BASE_URL))
        .json(&user_data)
        .send()
        .await
        .expect("Failed to create user");

    assert_eq!(response.status(), 201);
    let created_user = parse_json_response(response).await.expect("Failed to parse JSON");
    
    assert_eq!(created_user["username"], "testuser_integration");
    assert_eq!(created_user["email"], "integration@example.com");
    assert!(created_user["id"].is_string());
    assert!(created_user["created_at"].is_string());

    let user_id = created_user["id"].as_str().unwrap();

    // 3. 获取创建的用户
    let response = client
        .get(&format!("{}/api/users/{}", BASE_URL, user_id))
        .send()
        .await
        .expect("Failed to get user");

    assert_eq!(response.status(), 200);
    let fetched_user = parse_json_response(response).await.expect("Failed to parse JSON");
    assert_eq!(fetched_user["id"], user_id);
    assert_eq!(fetched_user["username"], "testuser_integration");

    // 4. 更新用户
    let update_data = json!({
        "username": "updated_testuser",
        "email": "updated@example.com"
    });

    let response = client
        .put(&format!("{}/api/users/{}", BASE_URL, user_id))
        .json(&update_data)
        .send()
        .await
        .expect("Failed to update user");

    assert_eq!(response.status(), 200);
    let updated_user = parse_json_response(response).await.expect("Failed to parse JSON");
    assert_eq!(updated_user["username"], "updated_testuser");
    assert_eq!(updated_user["email"], "updated@example.com");

    // 5. 删除用户
    let response = client
        .delete(&format!("{}/api/users/{}", BASE_URL, user_id))
        .send()
        .await
        .expect("Failed to delete user");

    assert_eq!(response.status(), 204);

    // 6. 验证用户已被删除
    let response = client
        .get(&format!("{}/api/users/{}", BASE_URL, user_id))
        .send()
        .await
        .expect("Failed to get deleted user");

    assert_eq!(response.status(), 404);
}

#[tokio::test]
async fn test_user_validation() {
    let client = create_client();

    // 测试无效的用户数据
    let invalid_user_data = json!({
        "username": "ab", // 太短
        "email": "invalid-email", // 无效邮箱
        "password": "123" // 太短
    });

    let response = client
        .post(&format!("{}/api/users", BASE_URL))
        .json(&invalid_user_data)
        .send()
        .await
        .expect("Failed to send request");

    assert_eq!(response.status(), 400);
    let error_response = parse_json_response(response).await.expect("Failed to parse JSON");
    assert!(error_response["error"].is_string());
    assert_eq!(error_response["status"], 400);
}

#[tokio::test]
async fn test_duplicate_username() {
    let client = create_client();

    let user_data = json!({
        "username": "duplicate_test",
        "email": "duplicate1@example.com",
        "password": "password123"
    });

    // 创建第一个用户
    let response = client
        .post(&format!("{}/api/users", BASE_URL))
        .json(&user_data)
        .send()
        .await
        .expect("Failed to create first user");

    assert_eq!(response.status(), 201);

    // 尝试创建相同用户名的用户
    let duplicate_user_data = json!({
        "username": "duplicate_test", // 相同用户名
        "email": "duplicate2@example.com",
        "password": "password123"
    });

    let response = client
        .post(&format!("{}/api/users", BASE_URL))
        .json(&duplicate_user_data)
        .send()
        .await
        .expect("Failed to send duplicate request");

    assert_eq!(response.status(), 409);
    let error_response = parse_json_response(response).await.expect("Failed to parse JSON");
    assert!(error_response["error"].as_str().unwrap().contains("用户名已存在"));
}

#[tokio::test]
async fn test_login_flow() {
    let client = create_client();

    // 1. 创建测试用户
    let user_data = json!({
        "username": "login_test",
        "email": "login@example.com",
        "password": "password123"
    });

    let response = client
        .post(&format!("{}/api/users", BASE_URL))
        .json(&user_data)
        .send()
        .await
        .expect("Failed to create user");

    assert_eq!(response.status(), 201);

    // 2. 测试正确的登录凭据
    let login_data = json!({
        "username": "login_test",
        "password": "password123"
    });

    let response = client
        .post(&format!("{}/api/auth/login", BASE_URL))
        .json(&login_data)
        .send()
        .await
        .expect("Failed to login");

    assert_eq!(response.status(), 200);
    let login_response = parse_json_response(response).await.expect("Failed to parse JSON");
    
    assert!(login_response["token"].is_string());
    assert!(login_response["user"]["id"].is_string());
    assert_eq!(login_response["user"]["username"], "login_test");

    // 3. 测试错误的密码
    let wrong_login_data = json!({
        "username": "login_test",
        "password": "wrongpassword"
    });

    let response = client
        .post(&format!("{}/api/auth/login", BASE_URL))
        .json(&wrong_login_data)
        .send()
        .await
        .expect("Failed to send wrong login");

    assert_eq!(response.status(), 401);

    // 4. 测试不存在的用户
    let nonexistent_login_data = json!({
        "username": "nonexistent_user",
        "password": "password123"
    });

    let response = client
        .post(&format!("{}/api/auth/login", BASE_URL))
        .json(&nonexistent_login_data)
        .send()
        .await
        .expect("Failed to send nonexistent login");

    assert_eq!(response.status(), 404);
}

#[tokio::test]
async fn test_not_found_endpoints() {
    let client = create_client();

    // 测试不存在的用户 ID
    let response = client
        .get(&format!("{}/api/users/00000000-0000-0000-0000-000000000000", BASE_URL))
        .send()
        .await
        .expect("Failed to send request");

    assert_eq!(response.status(), 404);

    // 测试不存在的端点
    let response = client
        .get(&format!("{}/api/nonexistent", BASE_URL))
        .send()
        .await
        .expect("Failed to send request");

    assert_eq!(response.status(), 404);
}