using WorkCameraExport.Models;
using WorkCameraExport.Services;
using WorkCameraExport.Services.Interfaces;

namespace WorkCameraExport.Forms
{
    /// <summary>
    /// 主页窗体 - 显示统计信息和功能入口
    /// </summary>
    public partial class HomeForm : Form
    {
        private readonly ApiService _apiService;
        private readonly ILogService? _logService;
        private readonly LoginStateManager? _loginStateManager;
        private readonly NetworkMonitor? _networkMonitor;
        private bool _isLoading;

        public HomeForm(ApiService apiService, ILogService? logService = null, LoginStateManager? loginStateManager = null, NetworkMonitor? networkMonitor = null)
        {
            InitializeComponent();
            _apiService = apiService;
            _logService = logService;
            _loginStateManager = loginStateManager;
            _networkMonitor = networkMonitor;

            // 订阅登录失效事件
            if (_loginStateManager != null)
            {
                _loginStateManager.LoginExpired += OnLoginExpired;
            }

            // 订阅网络状态变化事件
            if (_networkMonitor != null)
            {
                _networkMonitor.NetworkStatusChanged += OnNetworkStatusChanged;
            }
        }

        /// <summary>
        /// 窗体加载事件
        /// </summary>
        private async void HomeForm_Load(object sender, EventArgs e)
        {
            await LoadStatisticsAsync();
        }

        #region 统计数据加载

        /// <summary>
        /// 加载统计数据
        /// </summary>
        public async Task LoadStatisticsAsync()
        {
            if (_isLoading) return;

            _isLoading = true;
            SetLoadingState(true);

            try
            {
                _logService?.Info("开始加载统计数据");
                var (success, message, data) = await _apiService.GetStatisticsAsync();

                if (success && data != null)
                {
                    DisplayStatistics(data);
                    lblStatus.Text = $"数据更新时间: {DateTime.Now:yyyy-MM-dd HH:mm:ss}";
                    lblStatus.ForeColor = Color.Gray;
                    _logService?.Info("统计数据加载成功");
                }
                else
                {
                    ShowError(message);
                    _logService?.Warn($"统计数据加载失败: {message}");
                }
            }
            catch (Exception ex)
            {
                ShowError($"加载统计数据异常: {ex.Message}");
                _logService?.Error($"加载统计数据异常: {ex.Message}", ex);
            }
            finally
            {
                _isLoading = false;
                SetLoadingState(false);
            }
        }

        /// <summary>
        /// 显示统计数据
        /// </summary>
        private void DisplayStatistics(StatisticsDto data)
        {
            lblMonthRecordCount.Text = data.MonthRecordCount.ToString("N0");
            lblMonthImageCount.Text = data.MonthImageCount.ToString("N0");
            lblMonthWorkerCount.Text = data.MonthWorkerCount.ToString("N0");
            lblTodayRecordCount.Text = data.TodayRecordCount.ToString("N0");
            lblTotalRecordCount.Text = data.TotalRecordCount.ToString("N0");
            lblPendingMigrationCount.Text = data.PendingMigrationCount.ToString("N0");
        }

        /// <summary>
        /// 设置加载状态
        /// </summary>
        private void SetLoadingState(bool loading)
        {
            btnRefresh.Enabled = !loading;
            btnWorkRecord.Enabled = !loading;
            btnMonthReport.Enabled = !loading;
            btnMigration.Enabled = !loading;

            if (loading)
            {
                lblStatus.Text = "正在加载统计数据...";
                lblStatus.ForeColor = Color.Blue;
            }
        }

        /// <summary>
        /// 显示错误信息
        /// </summary>
        private void ShowError(string message)
        {
            lblStatus.Text = message;
            lblStatus.ForeColor = Color.Red;

            // 显示重试按钮
            btnRetry.Visible = true;
        }

        #endregion

        #region 导航功能

        /// <summary>
        /// 工作记录按钮点击事件
        /// </summary>
        private void btnWorkRecord_Click(object sender, EventArgs e)
        {
            NavigateToWorkRecord();
        }

        /// <summary>
        /// 导航到工作记录管理界面
        /// </summary>
        public void NavigateToWorkRecord()
        {
            _logService?.Info("导航到工作记录管理界面");
            
            // 创建导出服务
            var configService = new ConfigService();
            var imageService = new ImageService(_logService);
            var exportService = new ExportService(_apiService, imageService, configService, _logService);
            
            using var form = new WorkRecordForm(_apiService, _logService, exportService);
            form.ShowDialog(this);
        }

        /// <summary>
        /// 月报表按钮点击事件
        /// </summary>
        private void btnMonthReport_Click(object sender, EventArgs e)
        {
            NavigateToMonthReport();
        }

        /// <summary>
        /// 导航到月报表界面
        /// </summary>
        public void NavigateToMonthReport()
        {
            _logService?.Info("导航到月报表界面");
            
            // 创建导出服务
            var configService = new ConfigService();
            var imageService = new ImageService(_logService);
            var exportService = new ExportService(_apiService, imageService, configService, _logService);
            
            using var form = new MonthReportForm(_apiService, _logService, exportService);
            form.ShowDialog(this);
        }

        /// <summary>
        /// 历史数据迁移按钮点击事件
        /// </summary>
        private void btnMigration_Click(object sender, EventArgs e)
        {
            NavigateToMigration();
        }

        /// <summary>
        /// 导航到数据迁移界面
        /// </summary>
        public void NavigateToMigration()
        {
            _logService?.Info("导航到数据迁移界面");
            using var form = new MigrationForm(_apiService, _logService);
            form.ShowDialog(this);
        }

        #endregion

        #region 其他事件

        /// <summary>
        /// 刷新按钮点击事件
        /// </summary>
        private async void btnRefresh_Click(object sender, EventArgs e)
        {
            btnRetry.Visible = false;
            await LoadStatisticsAsync();
        }

        /// <summary>
        /// 重试按钮点击事件
        /// </summary>
        private async void btnRetry_Click(object sender, EventArgs e)
        {
            btnRetry.Visible = false;
            await LoadStatisticsAsync();
        }

        /// <summary>
        /// 设置按钮点击事件
        /// </summary>
        private void btnSettings_Click(object sender, EventArgs e)
        {
            NavigateToSettings();
        }

        /// <summary>
        /// 导航到设置界面
        /// </summary>
        public void NavigateToSettings()
        {
            _logService?.Info("导航到设置界面");
            var configService = new ConfigService();
            using var form = new SettingsForm(configService, _logService);
            form.ShowDialog(this);
        }

        /// <summary>
        /// 窗体关闭事件
        /// </summary>
        private void HomeForm_FormClosing(object sender, FormClosingEventArgs e)
        {
            // 取消订阅登录失效事件
            if (_loginStateManager != null)
            {
                _loginStateManager.LoginExpired -= OnLoginExpired;
            }

            // 取消订阅网络状态变化事件
            if (_networkMonitor != null)
            {
                _networkMonitor.NetworkStatusChanged -= OnNetworkStatusChanged;
            }

            _logService?.Info("关闭主页窗体");
        }

        /// <summary>
        /// 登录失效事件处理
        /// </summary>
        private void OnLoginExpired(object? sender, LoginExpiredEventArgs e)
        {
            // 确保在 UI 线程执行
            if (InvokeRequired)
            {
                Invoke(() => OnLoginExpired(sender, e));
                return;
            }

            _logService?.Warn($"登录失效: {e.Reason}");
            
            MessageBox.Show(
                e.Reason, 
                "登录失效", 
                MessageBoxButtons.OK, 
                MessageBoxIcon.Warning);

            // 关闭当前窗体，返回登录界面
            DialogResult = DialogResult.Abort;
            Close();
        }

        /// <summary>
        /// 网络状态变化事件处理
        /// </summary>
        private void OnNetworkStatusChanged(object? sender, NetworkStatusChangedEventArgs e)
        {
            // 确保在 UI 线程执行
            if (InvokeRequired)
            {
                Invoke(() => OnNetworkStatusChanged(sender, e));
                return;
            }

            if (e.IsAvailable)
            {
                _logService?.Info("网络已恢复连接");
                lblStatus.Text = "网络已恢复连接";
                lblStatus.ForeColor = Color.Green;
                
                // 网络恢复后自动刷新数据
                _ = LoadStatisticsAsync();
            }
            else
            {
                _logService?.Warn("网络连接已断开");
                lblStatus.Text = "网络连接已断开，请检查网络设置";
                lblStatus.ForeColor = Color.Red;
            }
        }

        #endregion
    }
}