//! 分页功能的HTTP API集成测试

use reqwest;
use serde_json::{json, Value};
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)
}

/// 测试辅助函数：创建测试用户
async fn create_test_user(client: &reqwest::Client, username: &str, email: &str) -> Result<Value, Box<dyn std::error::Error>> {
    let user_data = json!({
        "username": username,
        "email": email,
        "password": "password123"
    });

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

    if response.status().is_success() {
        parse_json_response(response).await
    } else {
        Err(format!("Failed to create user: {}", response.status()).into())
    }
}

/// 测试辅助函数：创建多个测试用户
async fn create_multiple_test_users(client: &reqwest::Client, count: usize) -> Result<Vec<Value>, Box<dyn std::error::Error>> {
    let mut users = Vec::new();
    
    for i in 0..count {
        let username = format!("pagination_test_user_{:02}", i + 1);
        let email = format!("pagination_test_{}@example.com", i + 1);
        
        match create_test_user(client, &username, &email).await {
            Ok(user) => users.push(user),
            Err(e) => {
                // 如果用户已存在，跳过
                if e.to_string().contains("409") {
                    continue;
                } else {
                    return Err(e);
                }
            }
        }
        
        // 添加小延迟确保创建时间不同
        tokio::time::sleep(tokio::time::Duration::from_millis(10)).await;
    }
    
    Ok(users)
}

#[tokio::test]
async fn test_users_list_pagination_basic() {
    let client = create_client();
    
    // 创建测试用户
    let _users = create_multiple_test_users(&client, 15).await
        .expect("Failed to create test users");
    
    // 测试第一页（默认参数）
    let response = client
        .get(&format!("{}/api/users", BASE_URL))
        .send()
        .await
        .expect("Failed to get users");
    
    assert_eq!(response.status(), 200);
    let json = parse_json_response(response).await.expect("Failed to parse JSON");
    
    // 验证分页响应结构
    assert!(json["data"].is_array(), "Response should have data array");
    assert!(json["pagination"].is_object(), "Response should have pagination object");
    
    let pagination = &json["pagination"];
    assert!(pagination["current_page"].is_number(), "Should have current_page");
    assert!(pagination["per_page"].is_number(), "Should have per_page");
    assert!(pagination["total_pages"].is_number(), "Should have total_pages");
    assert!(pagination["total_items"].is_number(), "Should have total_items");
    assert!(pagination["has_next"].is_boolean(), "Should have has_next");
    assert!(pagination["has_prev"].is_boolean(), "Should have has_prev");
    
    // 验证默认值
    assert_eq!(pagination["current_page"], 1);
    assert_eq!(pagination["per_page"], 10);
    assert!(!pagination["has_prev"].as_bool().unwrap(), "First page should not have previous");
}

#[tokio::test]
async fn test_users_list_pagination_with_params() {
    let client = create_client();
    
    // 确保有足够的测试数据
    let _users = create_multiple_test_users(&client, 12).await
        .expect("Failed to create test users");
    
    // 测试第一页，每页5个
    let response = client
        .get(&format!("{}/api/users?page=1&limit=5", BASE_URL))
        .send()
        .await
        .expect("Failed to get users page 1");
    
    assert_eq!(response.status(), 200);
    let json = parse_json_response(response).await.expect("Failed to parse JSON");
    
    let data = json["data"].as_array().unwrap();
    let pagination = &json["pagination"];
    
    assert_eq!(data.len(), 5, "First page should have 5 users");
    assert_eq!(pagination["current_page"], 1);
    assert_eq!(pagination["per_page"], 5);
    assert!(!pagination["has_prev"].as_bool().unwrap());
    
    // 测试第二页
    let response = client
        .get(&format!("{}/api/users?page=2&limit=5", BASE_URL))
        .send()
        .await
        .expect("Failed to get users page 2");
    
    assert_eq!(response.status(), 200);
    let json = parse_json_response(response).await.expect("Failed to parse JSON");
    
    let data = json["data"].as_array().unwrap();
    let pagination = &json["pagination"];
    
    assert_eq!(data.len(), 5, "Second page should have 5 users");
    assert_eq!(pagination["current_page"], 2);
    assert_eq!(pagination["per_page"], 5);
    assert!(pagination["has_prev"].as_bool().unwrap(), "Second page should have previous");
}

#[tokio::test]
async fn test_users_list_pagination_edge_cases() {
    let client = create_client();
    
    // 测试页码为0（应该被修正为1）
    let response = client
        .get(&format!("{}/api/users?page=0&limit=5", BASE_URL))
        .send()
        .await
        .expect("Failed to get users with page=0");
    
    assert_eq!(response.status(), 200);
    let json = parse_json_response(response).await.expect("Failed to parse JSON");
    
    let pagination = &json["pagination"];
    assert_eq!(pagination["current_page"], 1, "Page 0 should be corrected to 1");
    
    // 测试超大限制（应该被限制为100）
    let response = client
        .get(&format!("{}/api/users?page=1&limit=200", BASE_URL))
        .send()
        .await
        .expect("Failed to get users with large limit");
    
    assert_eq!(response.status(), 200);
    let json = parse_json_response(response).await.expect("Failed to parse JSON");
    
    let pagination = &json["pagination"];
    assert_eq!(pagination["per_page"], 100, "Limit should be capped at 100");
    
    // 测试限制为0（应该被修正为1）
    let response = client
        .get(&format!("{}/api/users?page=1&limit=0", BASE_URL))
        .send()
        .await
        .expect("Failed to get users with limit=0");
    
    assert_eq!(response.status(), 200);
    let json = parse_json_response(response).await.expect("Failed to parse JSON");
    
    let pagination = &json["pagination"];
    assert_eq!(pagination["per_page"], 1, "Limit 0 should be corrected to 1");
}

#[tokio::test]
async fn test_users_list_pagination_beyond_range() {
    let client = create_client();
    
    // 确保有一些测试数据
    let _users = create_multiple_test_users(&client, 5).await
        .expect("Failed to create test users");
    
    // 测试超出范围的页码
    let response = client
        .get(&format!("{}/api/users?page=100&limit=5", BASE_URL))
        .send()
        .await
        .expect("Failed to get users beyond range");
    
    assert_eq!(response.status(), 200);
    let json = parse_json_response(response).await.expect("Failed to parse JSON");
    
    let data = json["data"].as_array().unwrap();
    let pagination = &json["pagination"];
    
    assert_eq!(data.len(), 0, "Beyond range page should return empty array");
    assert_eq!(pagination["current_page"], 100);
    assert!(!pagination["has_next"].as_bool().unwrap(), "Beyond range should not have next");
}

#[tokio::test]
async fn test_users_search_pagination() {
    let client = create_client();
    
    // 创建一些包含特定关键词的用户
    let admin_users = vec![
        ("admin_user_1", "admin1@example.com"),
        ("admin_user_2", "admin2@example.com"),
        ("admin_user_3", "admin3@example.com"),
        ("admin_user_4", "admin4@example.com"),
        ("admin_user_5", "admin5@example.com"),
    ];
    
    for (username, email) in admin_users {
        let _ = create_test_user(&client, username, email).await;
    }
    
    // 创建一些普通用户
    let _ = create_multiple_test_users(&client, 3).await;
    
    // 搜索admin用户，第一页
    let response = client
        .get(&format!("{}/api/users/search?q=admin&page=1&limit=3", BASE_URL))
        .send()
        .await
        .expect("Failed to search users");
    
    assert_eq!(response.status(), 200);
    let json = parse_json_response(response).await.expect("Failed to parse JSON");
    
    // 验证搜索响应结构
    assert!(json["data"].is_array(), "Search response should have data array");
    assert!(json["pagination"].is_object(), "Search response should have pagination");
    assert!(json["search_params"].is_object(), "Search response should have search_params");
    assert!(json["total_filtered"].is_number(), "Search response should have total_filtered");
    
    let data = json["data"].as_array().unwrap();
    let pagination = &json["pagination"];
    
    // 验证搜索结果
    assert!(data.len() <= 3, "Should return at most 3 results per page");
    assert_eq!(pagination["current_page"], 1);
    assert_eq!(pagination["per_page"], 3);
    
    // 验证搜索结果包含关键词
    for user in data {
        let username = user["username"].as_str().unwrap();
        let email = user["email"].as_str().unwrap();
        assert!(
            username.contains("admin") || email.contains("admin"),
            "Search result should contain 'admin' keyword"
        );
    }
    
    // 测试搜索第二页
    let response = client
        .get(&format!("{}/api/users/search?q=admin&page=2&limit=3", BASE_URL))
        .send()
        .await
        .expect("Failed to search users page 2");
    
    assert_eq!(response.status(), 200);
    let json = parse_json_response(response).await.expect("Failed to parse JSON");
    
    let pagination = &json["pagination"];
    assert_eq!(pagination["current_page"], 2);
    assert!(pagination["has_prev"].as_bool().unwrap(), "Second page should have previous");
}

#[tokio::test]
async fn test_users_search_with_filters_and_pagination() {
    let client = create_client();
    
    // 创建一些测试用户
    let test_users = vec![
        ("filter_test_1", "filter1@test.com"),
        ("filter_test_2", "filter2@test.com"),
        ("filter_test_3", "filter3@test.com"),
        ("other_user_1", "other1@example.com"),
        ("other_user_2", "other2@example.com"),
    ];
    
    for (username, email) in test_users {
        let _ = create_test_user(&client, username, email).await;
    }
    
    // 按邮箱域名搜索，带分页
    let response = client
        .get(&format!("{}/api/users/search?email=test.com&page=1&limit=2&sort_by=username&sort_order=asc", BASE_URL))
        .send()
        .await
        .expect("Failed to search users with email filter");
    
    assert_eq!(response.status(), 200);
    let json = parse_json_response(response).await.expect("Failed to parse JSON");
    
    let data = json["data"].as_array().unwrap();
    let pagination = &json["pagination"];
    let search_params = &json["search_params"];
    
    // 验证过滤结果
    assert!(data.len() <= 2, "Should return at most 2 results per page");
    assert_eq!(pagination["per_page"], 2);
    
    // 验证搜索参数被正确返回
    assert_eq!(search_params["email"], "test.com");
    assert_eq!(search_params["sort_by"], "username");
    assert_eq!(search_params["sort_order"], "asc");
    
    // 验证结果包含正确的邮箱域名
    for user in data {
        let email = user["email"].as_str().unwrap();
        assert!(email.contains("test.com"), "Filtered result should contain test.com domain");
    }
    
    // 验证排序（用户名升序）
    if data.len() > 1 {
        let first_username = data[0]["username"].as_str().unwrap();
        let second_username = data[1]["username"].as_str().unwrap();
        assert!(first_username <= second_username, "Results should be sorted by username ascending");
    }
}

#[tokio::test]
async fn test_pagination_consistency_across_requests() {
    let client = create_client();
    
    // 创建固定数量的用户
    let _users = create_multiple_test_users(&client, 10).await
        .expect("Failed to create test users");
    
    // 获取第一页
    let response1 = client
        .get(&format!("{}/api/users?page=1&limit=3", BASE_URL))
        .send()
        .await
        .expect("Failed to get first page");
    
    let json1 = parse_json_response(response1).await.expect("Failed to parse JSON");
    let data1 = json1["data"].as_array().unwrap();
    let total_items1 = json1["pagination"]["total_items"].as_u64().unwrap();
    
    // 获取第二页
    let response2 = client
        .get(&format!("{}/api/users?page=2&limit=3", BASE_URL))
        .send()
        .await
        .expect("Failed to get second page");
    
    let json2 = parse_json_response(response2).await.expect("Failed to parse JSON");
    let data2 = json2["data"].as_array().unwrap();
    let total_items2 = json2["pagination"]["total_items"].as_u64().unwrap();
    
    // 验证总数一致性
    assert_eq!(total_items1, total_items2, "Total items should be consistent across pages");
    
    // 验证没有重复用户
    let mut user_ids1: Vec<String> = data1.iter()
        .map(|u| u["id"].as_str().unwrap().to_string())
        .collect();
    let user_ids2: Vec<String> = data2.iter()
        .map(|u| u["id"].as_str().unwrap().to_string())
        .collect();
    
    user_ids1.extend(user_ids2);
    user_ids1.sort();
    user_ids1.dedup();
    
    // 去重后的长度应该等于原始长度（没有重复）
    let expected_length = data1.len() + data2.len();
    assert_eq!(user_ids1.len(), expected_length, "No duplicate users should appear across pages");
}