//! 分页功能专项测试

use rust_user_api::{
    models::{
        user::User,
        pagination::{PaginationParams, PaginatedResponse},
        search::UserSearchParams,
        role::UserRole,
    },
    storage::{database::DatabaseUserStore, memory::MemoryUserStore, UserStore},
    utils::errors::ApiError,
};
use uuid::Uuid;
use chrono::Utc;
use std::sync::Arc;

/// 创建测试用户
fn create_test_user(username: &str, email: &str) -> User {
    User {
        id: Uuid::new_v4(),
        username: username.to_string(),
        email: email.to_string(),
        password_hash: "hashed_password".to_string(),
        role: UserRole::User,
        created_at: Utc::now(),
        updated_at: Utc::now(),
    }
}

/// 创建多个测试用户
async fn create_multiple_users(store: &dyn UserStore, count: usize) -> Vec<User> {
    let mut users = Vec::new();
    
    for i in 0..count {
        let user = create_test_user(
            &format!("user{:02}", i + 1),
            &format!("user{}@example.com", i + 1),
        );
        
        let created_user = store.create_user(user).await.unwrap();
        users.push(created_user);
        
        // 添加小延迟确保创建时间不同
        tokio::time::sleep(tokio::time::Duration::from_millis(1)).await;
    }
    
    users
}

/// 测试内存存储的分页功能
#[tokio::test]
async fn test_memory_store_pagination() {
    let store = MemoryUserStore::new();
    
    // 创建15个用户
    let users = create_multiple_users(&store, 15).await;
    
    // 测试第一页（每页5个）
    let params = PaginationParams {
        page: Some(1),
        limit: Some(5),
    };
    
    let (paginated_users, total_count) = store.list_users_paginated(&params).await.unwrap();
    
    assert_eq!(total_count, 15, "总用户数应该是15");
    assert_eq!(paginated_users.len(), 5, "第一页应该有5个用户");
    
    // 测试第二页
    let params = PaginationParams {
        page: Some(2),
        limit: Some(5),
    };
    
    let (paginated_users, total_count) = store.list_users_paginated(&params).await.unwrap();
    
    assert_eq!(total_count, 15, "总用户数应该是15");
    assert_eq!(paginated_users.len(), 5, "第二页应该有5个用户");
    
    // 测试第三页
    let params = PaginationParams {
        page: Some(3),
        limit: Some(5),
    };
    
    let (paginated_users, total_count) = store.list_users_paginated(&params).await.unwrap();
    
    assert_eq!(total_count, 15, "总用户数应该是15");
    assert_eq!(paginated_users.len(), 5, "第三页应该有5个用户");
    
    // 测试第四页（超出范围）
    let params = PaginationParams {
        page: Some(4),
        limit: Some(5),
    };
    
    let (paginated_users, total_count) = store.list_users_paginated(&params).await.unwrap();
    
    assert_eq!(total_count, 15, "总用户数应该是15");
    assert_eq!(paginated_users.len(), 0, "第四页应该没有用户");
}

/// 测试数据库存储的分页功能
#[tokio::test]
async fn test_database_store_pagination() {
    let database_url = "sqlite::memory:";
    let store = DatabaseUserStore::from_url(database_url).await.unwrap();
    
    // 创建12个用户
    let users = create_multiple_users(&store, 12).await;
    
    // 测试第一页（每页4个）
    let params = PaginationParams {
        page: Some(1),
        limit: Some(4),
    };
    
    let (paginated_users, total_count) = store.list_users_paginated(&params).await.unwrap();
    
    assert_eq!(total_count, 12, "总用户数应该是12");
    assert_eq!(paginated_users.len(), 4, "第一页应该有4个用户");
    
    // 验证排序（应该按创建时间倒序）
    for i in 0..paginated_users.len() - 1 {
        assert!(
            paginated_users[i].created_at >= paginated_users[i + 1].created_at,
            "用户应该按创建时间倒序排列"
        );
    }
    
    // 测试最后一页
    let params = PaginationParams {
        page: Some(3),
        limit: Some(4),
    };
    
    let (paginated_users, total_count) = store.list_users_paginated(&params).await.unwrap();
    
    assert_eq!(total_count, 12, "总用户数应该是12");
    assert_eq!(paginated_users.len(), 4, "第三页应该有4个用户");
}

/// 测试分页参数的默认值和边界情况
#[tokio::test]
async fn test_pagination_params_edge_cases() {
    let store = MemoryUserStore::new();
    
    // 创建8个用户
    create_multiple_users(&store, 8).await;
    
    // 测试默认参数
    let params = PaginationParams {
        page: None,
        limit: None,
    };
    
    let (paginated_users, total_count) = store.list_users_paginated(&params).await.unwrap();
    
    assert_eq!(total_count, 8, "总用户数应该是8");
    assert_eq!(paginated_users.len(), 8, "默认应该返回所有用户（限制为10）");
    
    // 测试页码为0（应该被修正为1）
    let params = PaginationParams {
        page: Some(0),
        limit: Some(3),
    };
    
    let (paginated_users, total_count) = store.list_users_paginated(&params).await.unwrap();
    
    assert_eq!(total_count, 8, "总用户数应该是8");
    assert_eq!(paginated_users.len(), 3, "页码0应该被修正为1，返回3个用户");
    
    // 测试超大限制（应该被限制为100）
    let params = PaginationParams {
        page: Some(1),
        limit: Some(200),
    };
    
    let (paginated_users, total_count) = store.list_users_paginated(&params).await.unwrap();
    
    assert_eq!(total_count, 8, "总用户数应该是8");
    assert_eq!(paginated_users.len(), 8, "应该返回所有8个用户（限制为100）");
    
    // 测试限制为0（应该被修正为1）
    let params = PaginationParams {
        page: Some(1),
        limit: Some(0),
    };
    
    let (paginated_users, total_count) = store.list_users_paginated(&params).await.unwrap();
    
    assert_eq!(total_count, 8, "总用户数应该是8");
    assert_eq!(paginated_users.len(), 1, "限制0应该被修正为1");
}

/// 测试空数据库的分页
#[tokio::test]
async fn test_pagination_empty_database() {
    let store = MemoryUserStore::new();
    
    let params = PaginationParams {
        page: Some(1),
        limit: Some(10),
    };
    
    let (paginated_users, total_count) = store.list_users_paginated(&params).await.unwrap();
    
    assert_eq!(total_count, 0, "空数据库总用户数应该是0");
    assert_eq!(paginated_users.len(), 0, "空数据库应该返回空列表");
}

/// 测试搜索功能的分页
#[tokio::test]
async fn test_search_pagination() {
    let store = MemoryUserStore::new();
    
    // 创建用户，其中一些包含"admin"
    let users = vec![
        create_test_user("admin1", "admin1@example.com"),
        create_test_user("user1", "user1@example.com"),
        create_test_user("admin2", "admin2@example.com"),
        create_test_user("user2", "user2@example.com"),
        create_test_user("admin3", "admin3@example.com"),
        create_test_user("user3", "user3@example.com"),
    ];
    
    for user in users {
        store.create_user(user).await.unwrap();
    }
    
    // 搜索包含"admin"的用户，第一页
    let search_params = UserSearchParams {
        q: Some("admin".to_string()),
        ..Default::default()
    };
    
    let pagination_params = PaginationParams {
        page: Some(1),
        limit: Some(2),
    };
    
    let (search_results, total_count) = store.search_users(&search_params, &pagination_params).await.unwrap();
    
    assert_eq!(total_count, 3, "应该找到3个admin用户");
    assert_eq!(search_results.len(), 2, "第一页应该返回2个用户");
    
    // 验证搜索结果
    for user in &search_results {
        assert!(
            user.username.contains("admin") || user.email.contains("admin"),
            "搜索结果应该包含admin关键词"
        );
    }
    
    // 搜索第二页
    let pagination_params = PaginationParams {
        page: Some(2),
        limit: Some(2),
    };
    
    let (search_results, total_count) = store.search_users(&search_params, &pagination_params).await.unwrap();
    
    assert_eq!(total_count, 3, "总数应该仍然是3");
    assert_eq!(search_results.len(), 1, "第二页应该返回1个用户");
}

/// 测试PaginatedResponse结构
#[tokio::test]
async fn test_paginated_response_structure() {
    let store = MemoryUserStore::new();
    
    // 创建7个用户
    create_multiple_users(&store, 7).await;
    
    let params = PaginationParams {
        page: Some(2),
        limit: Some(3),
    };
    
    let (users, total_count) = store.list_users_paginated(&params).await.unwrap();
    let response = PaginatedResponse::new(
        users.into_iter().map(|u| u.username).collect(),
        &params,
        total_count
    );
    
    // 验证分页信息
    assert_eq!(response.pagination.current_page, 2);
    assert_eq!(response.pagination.per_page, 3);
    assert_eq!(response.pagination.total_pages, 3); // 7个用户，每页3个，共3页
    assert_eq!(response.pagination.total_items, 7);
    assert!(response.pagination.has_prev, "第二页应该有上一页");
    assert!(response.pagination.has_next, "第二页应该有下一页");
    
    // 测试第一页
    let params = PaginationParams {
        page: Some(1),
        limit: Some(3),
    };
    
    let (users, total_count) = store.list_users_paginated(&params).await.unwrap();
    let response = PaginatedResponse::new(
        users.into_iter().map(|u| u.username).collect(),
        &params,
        total_count
    );
    
    assert!(!response.pagination.has_prev, "第一页不应该有上一页");
    assert!(response.pagination.has_next, "第一页应该有下一页");
    
    // 测试最后一页
    let params = PaginationParams {
        page: Some(3),
        limit: Some(3),
    };
    
    let (users, total_count) = store.list_users_paginated(&params).await.unwrap();
    let response = PaginatedResponse::new(
        users.into_iter().map(|u| u.username).collect(),
        &params,
        total_count
    );
    
    assert!(response.pagination.has_prev, "最后一页应该有上一页");
    assert!(!response.pagination.has_next, "最后一页不应该有下一页");
    assert_eq!(response.data.len(), 1, "最后一页应该有1个用户");
}

/// 测试分页功能的性能（大数据量）
#[tokio::test]
async fn test_pagination_performance() {
    let store = MemoryUserStore::new();
    
    // 创建100个用户
    create_multiple_users(&store, 100).await;
    
    let start = std::time::Instant::now();
    
    // 测试获取中间页面的性能
    let params = PaginationParams {
        page: Some(50),
        limit: Some(2),
    };
    
    let (paginated_users, total_count) = store.list_users_paginated(&params).await.unwrap();
    
    let duration = start.elapsed();
    
    assert_eq!(total_count, 100, "总用户数应该是100");
    assert_eq!(paginated_users.len(), 2, "应该返回2个用户");
    
    // 性能检查：应该在合理时间内完成（这里设置为100ms，实际应该更快）
    assert!(duration.as_millis() < 100, "分页查询应该在100ms内完成，实际用时: {:?}", duration);
}