using System.ComponentModel;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Media;
using Forms = System.Windows.Forms;

namespace OmniScheduler;

public partial class MainWindow : Window, INotifyPropertyChanged
{
    private readonly StateStore _store = new();
    private readonly NotifyClient _client = new();
    private readonly SchedulerService _scheduler;
    private readonly Forms.NotifyIcon _trayIcon;
    private bool _allowExit;
    private ScheduledTask? _selectedTask;
    private string _statusText = "就绪";

    public MainWindow()
    {
        InitializeComponent();
        State = _store.Load();
        _scheduler = new SchedulerService(State, _client, AddLog);
        _trayIcon = BuildTrayIcon();
        DataContext = this;
        _scheduler.Start();

        if (Environment.GetCommandLineArgs().Any(a => a.Equals("--tray", StringComparison.OrdinalIgnoreCase)))
        {
            Hide();
        }
    }

    public SchedulerState State { get; }

    public ScheduledTask? SelectedTask
    {
        get => _selectedTask;
        set
        {
            _selectedTask = value;
            PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(nameof(SelectedTask)));
        }
    }

    public string StatusText
    {
        get => _statusText;
        set
        {
            _statusText = value;
            PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(nameof(StatusText)));
        }
    }

    public event PropertyChangedEventHandler? PropertyChanged;

    private Forms.NotifyIcon BuildTrayIcon()
    {
        var menu = new Forms.ContextMenuStrip();
        menu.Items.Add("打开主界面", null, (_, _) => ShowDashboard());
        menu.Items.Add("暂停全部任务", null, (_, _) =>
        {
            _scheduler.IsPaused = !_scheduler.IsPaused;
            PauseToggle.IsChecked = _scheduler.IsPaused;
        });
        menu.Items.Add("退出", null, (_, _) => ExitApplication());

        var icon = new Forms.NotifyIcon
        {
            Icon = System.Drawing.Icon.ExtractAssociatedIcon(Environment.ProcessPath ?? string.Empty)
                ?? System.Drawing.SystemIcons.Application,
            Text = "OmniScheduler",
            Visible = true,
            ContextMenuStrip = menu
        };
        icon.DoubleClick += (_, _) => ShowDashboard();
        return icon;
    }

    private void AddTask_Click(object sender, RoutedEventArgs e)
    {
        var task = new ScheduledTask();
        task.Triggers.Add(new TaskTrigger());
        if (TaskEditorWindow.Edit(this, task, State.Settings, _client))
        {
            State.Tasks.Add(task);
            SaveAndRefresh("已创建任务");
        }
    }

    private void EditTask_Click(object sender, RoutedEventArgs e)
    {
        if (SelectedTask is null)
        {
            StatusText = "请先选择一个任务";
            return;
        }

        if (TaskEditorWindow.Edit(this, SelectedTask, State.Settings, _client))
        {
            SaveAndRefresh("任务已保存");
        }
    }

    private void TasksGrid_MouseDoubleClick(object sender, System.Windows.Input.MouseButtonEventArgs e)
    {
        var row = FindVisualParent<DataGridRow>(e.OriginalSource as DependencyObject);
        if (row?.Item is not ScheduledTask task)
        {
            return;
        }

        SelectedTask = task;
        EditTask_Click(sender, e);
    }

    private void DeleteTask_Click(object sender, RoutedEventArgs e)
    {
        if (SelectedTask is null)
        {
            return;
        }

        if (System.Windows.MessageBox.Show(this, $"删除任务“{SelectedTask.Name}”？", "确认删除", MessageBoxButton.YesNo, MessageBoxImage.Warning) == MessageBoxResult.Yes)
        {
            State.Tasks.Remove(SelectedTask);
            SaveAndRefresh("任务已删除");
        }
    }

    private void CloneTask_Click(object sender, RoutedEventArgs e)
    {
        if (SelectedTask is null)
        {
            return;
        }

        var clone = SelectedTask.Clone();
        State.Tasks.Add(clone);
        SelectedTask = clone;
        SaveAndRefresh("任务已克隆");
    }

    private async void FireTask_Click(object sender, RoutedEventArgs e)
    {
        if (SelectedTask is null)
        {
            StatusText = "请先选择一个任务";
            return;
        }

        StatusText = "正在手动触发...";
        await _scheduler.FireNowAsync(SelectedTask);
        SaveAndRefresh("手动触发完成");
    }

    private void Settings_Click(object sender, RoutedEventArgs e)
    {
        if (SettingsWindow.Edit(this, State.Settings))
        {
            SaveAndRefresh("设置已保存");
        }
    }

    private void PauseToggle_Changed(object sender, RoutedEventArgs e)
    {
        _scheduler.IsPaused = PauseToggle.IsChecked == true;
        StatusText = _scheduler.IsPaused ? "全部任务已暂停" : "调度已恢复";
    }

    private void ClearLogs_Click(object sender, RoutedEventArgs e)
    {
        State.Logs.Clear();
        SaveAndRefresh("日志已清空");
    }

    private void LogsGrid_MouseDoubleClick(object sender, System.Windows.Input.MouseButtonEventArgs e)
    {
        if (LogsGrid.SelectedItem is ExecutionLog log)
        {
            System.Windows.MessageBox.Show(this, $"请求 JSON:\n{log.RequestJson}\n\n响应:\n{log.Response}", "日志详情", MessageBoxButton.OK, log.Level == "ERROR" ? MessageBoxImage.Error : MessageBoxImage.Information);
        }
    }

    private void AddLog(ExecutionLog log)
    {
        Dispatcher.Invoke(() =>
        {
            State.Logs.Insert(0, log);
            StatusText = $"{log.Timestamp:HH:mm:ss} {log.TaskName}: {log.Message}";
            _store.Save(State);
        });
    }

    private void SaveAndRefresh(string status)
    {
        _scheduler.RecalculateNextRuns();
        foreach (var task in State.Tasks)
        {
            task.Notify(nameof(ScheduledTask.TriggerSummary));
        }
        TasksGrid.Items.Refresh();
        _store.Save(State);
        StatusText = status;
    }

    private void Window_Closing(object? sender, CancelEventArgs e)
    {
        if (_allowExit)
        {
            _trayIcon.Visible = false;
            _trayIcon.Dispose();
            _store.Save(State);
            return;
        }

        e.Cancel = true;
        Hide();
        StatusText = "已隐藏到系统托盘";
    }

    private void ShowDashboard()
    {
        Show();
        WindowState = WindowState.Normal;
        Activate();
    }

    private void ExitApplication()
    {
        _allowExit = true;
        Close();
    }

    private static T? FindVisualParent<T>(DependencyObject? child) where T : DependencyObject
    {
        while (child is not null)
        {
            if (child is T parent)
            {
                return parent;
            }

            child = VisualTreeHelper.GetParent(child);
        }

        return null;
    }
}