using Microsoft.Maui.Controls;
using System.Net.Http;

namespace VideoDownloader.Mobile;

/// <summary>M1 연결 페이지: QR 스캔(ZXing) + 수동 입력 폴백.</summary>
public sealed class ConnectPage : ContentPage
{
    private readonly Entry _manual = new() { Placeholder = "PC 주소 (예: 192.168.0.223:52100)", Keyboard = Keyboard.Url };
    private readonly Entry _manualToken = new() { Placeholder = "토큰 (QR 못 쓸 때)", IsPassword = true };
    private readonly Label _status = new() { Text = "PC 앱에서 '기기 연결'을 누르고 QR 을 스캔하세요", HorizontalOptions = LayoutOptions.Center, Margin = new Thickness(0, 12) };

    public ConnectPage()
    {
        Title = "연결";

        // 시뮬레이터는 카메라 하드웨어가 없어 세션 시작이 첫 프레임을 막음(UIApplication hang) → 실기기에서만 스캐너
        View scannerArea = new Label
        {
            Text = "📷 시뮬레이터 — 수동 입력을 이용하세요",
            HorizontalOptions = LayoutOptions.Fill, VerticalOptions = LayoutOptions.Center,
            HorizontalTextAlignment = TextAlignment.Center, HeightRequest = 120,
            BackgroundColor = Colors.Black, TextColor = Colors.LightGray,
        };
        if (DeviceInfo.Current.DeviceType == DeviceType.Physical)
        {
            var scanner = new ZXing.Net.Maui.Controls.CameraBarcodeReaderView
            {
                HorizontalOptions = LayoutOptions.Fill,
                HeightRequest = 320,
                Options = new ZXing.Net.Maui.BarcodeReaderOptions
                {
                    Formats = ZXing.Net.Maui.BarcodeFormats.TwoDimensional,
                    AutoRotate = true,
                },
            };
            scanner.BarcodesDetected += (s, e) =>
            {
                var text = e.Results?.FirstOrDefault()?.Value;
                if (string.IsNullOrEmpty(text)) return;
                MainThread.BeginInvokeOnMainThread(() =>
                {
                    if (ApiClient.Instance.Configure(text))
                    {
                        _status.Text = "✅ 연결됨";
                        scanner.IsDetecting = false;
                    }
                });
            };
            scannerArea = scanner;
        }

        var connectBtn = new Button { Text = "수동 연결" };
        connectBtn.Clicked += (_, _) =>
        {
            if (ApiClient.Instance.Configure(_manual.Text, _manualToken.Text)) _status.Text = "✅ 연결됨";
            else _status.Text = "❌ 연결 실패 — 주소/토큰 확인";
        };
        var forgetBtn = new Button { Text = "연결 해제", BackgroundColor = Colors.Gray };
        forgetBtn.Clicked += (_, _) => { ApiClient.Instance.Forget(); _status.Text = "해제됨"; };

        Content = new ScrollView
        {
            Content = new VerticalStackLayout
            {
                Padding = 20, Spacing = 10,
                Children = { _status, scannerArea, _manual, _manualToken, connectBtn, forgetBtn }
            }
        };
    }
}

/// <summary>M1 큐 페이지: 목록(2초 폴링) + URL 추가 + 제어.</summary>
public sealed class QueuePage : ContentPage
{
    private readonly Entry _url = new() { Placeholder = "YouTube·영상 URL 붙여넣기", Keyboard = Keyboard.Url };
    private readonly Label _summary = new();
    private readonly CollectionView _list = new();
    private readonly IDispatcherTimer _timer;

    public QueuePage()
    {
        Title = "다운로드 큐";
        var addBtn = new Button { Text = "PC에서 받기" };
        addBtn.Clicked += async (_, _) =>
        {
            if (string.IsNullOrWhiteSpace(_url.Text)) return;
            _summary.Text = "전송 중…";
            var ok = await ApiClient.Instance.AddAsync(_url.Text.Trim());
            _summary.Text = ok ? "✅ PC 대기열에 추가됨" : "❌ 실패 (연결 확인)";
            if (ok) _url.Text = "";
            await Refresh();
        };

        _list.ItemTemplate = new DataTemplate(() =>
        {
            var title = new Label { FontSize = 14, FontAttributes = FontAttributes.Bold, LineBreakMode = LineBreakMode.TailTruncation };
            title.SetBinding(Label.TextProperty, "Title");
            var status = new Label { FontSize = 12, TextColor = Colors.Gray };
            status.SetBinding(Label.TextProperty, new Binding("Percent", stringFormat: "{0:0}%"));
            var bar = new ProgressBar { HeightRequest = 6 };
            bar.SetBinding(ProgressBar.ProgressProperty, new Binding("Percent", converter: new PercentConverter()));
            var state = new Label { FontSize = 11, TextColor = Colors.Gray };
            state.SetBinding(Label.TextProperty, "Status");

            var pause = new Button { Text = "⏸" };
            var resume = new Button { Text = "▶" };
            var cancel = new Button { Text = "✕", BackgroundColor = Colors.Gray };
                        pause.Clicked += async (_, _) => { if (pause.BindingContext is QueueItem qi) { await ApiClient.Instance.ControlAsync(qi.Id, "pause"); await Refresh(); } };
            resume.Clicked += async (_, _) => { if (resume.BindingContext is QueueItem qi) { await ApiClient.Instance.ControlAsync(qi.Id, "resume"); await Refresh(); } };
            cancel.Clicked += async (_, _) => { if (cancel.BindingContext is QueueItem qi) { await ApiClient.Instance.ControlAsync(qi.Id, "cancel"); await Refresh(); } };

            return new Frame
            {
                Margin = new Thickness(0, 4), Padding = 12, CornerRadius = 10,
                Content = new VerticalStackLayout
                {
                    Spacing = 6,
                    Children = { title, bar, new HorizontalStackLayout { Children = { state, new Label { Text = "  " } } },
                        new HorizontalStackLayout { Spacing = 8, Children = { pause, resume, cancel } } }
                }
            };
        });

        _timer = Dispatcher.CreateTimer();
        _timer.Interval = TimeSpan.FromSeconds(2);
        _timer.Tick += async (_, _) => await Refresh();
        Appearing += (_, _) => _timer.Start();
        Disappearing += (_, _) => _timer.Stop();

        Content = new VerticalStackLayout
        {
            Padding = 16, Spacing = 10,
            Children = { _url, addBtn, _summary, _list }
        };
    }

    private async Task Refresh()
    {
        if (!ApiClient.Instance.IsConfigured) { _summary.Text = "⚠️ 먼저 연결하세요"; return; }
        var items = await ApiClient.Instance.GetQueueAsync();
        _list.ItemsSource = items;
        var err = ApiClient.Instance.LastError;
        _summary.Text = err != null ? $"❌ {err}" : items.Count == 0 ? "대기 중인 항목이 없습니다" : $"{items.Count}건";
    }

    private sealed class PercentConverter : IValueConverter
    {
        public object Convert(object? value, Type t, object? p, System.Globalization.CultureInfo c) => Math.Clamp(value is double d ? d / 100.0 : 0, 0, 1);
        public object ConvertBack(object? v, Type t, object? p, System.Globalization.CultureInfo c) => throw new NotSupportedException();
    }
}

/// <summary>M2 라이브러리 페이지: 목록 → 탭하여 스트리밍 재생.</summary>
public sealed class LibraryPage : ContentPage
{
    private readonly CollectionView _list = new();

    public LibraryPage()
    {
        Title = "라이브러리";
        _list.ItemTemplate = new DataTemplate(() =>
        {
            var name = new Label { FontSize = 14, FontAttributes = FontAttributes.Bold, LineBreakMode = LineBreakMode.TailTruncation };
            name.SetBinding(Label.TextProperty, "FileName");
            var size = new Label { FontSize = 11, TextColor = Colors.Gray };
            size.SetBinding(Label.TextProperty, new Binding("SizeBytes", stringFormat: "{0:N0} bytes"));
            var card = new Frame
            {
                Margin = new Thickness(0, 4), Padding = 12, CornerRadius = 10,
                Content = new VerticalStackLayout { Children = { name, size } }
            };
            // CollectionView.SelectionChanged 는 Android 에서 발화 불안정 → 템플릿 카드에 탭 제스처
            var tap = new TapGestureRecognizer();
            tap.Tapped += (_, _) => { if (card.BindingContext is LibraryItem item) OpenPlayer(item); };
            card.GestureRecognizers.Add(tap);
            return card;
        });
        _list.SelectionMode = SelectionMode.None;

        var refresh = new Button { Text = "새로고침" };
        refresh.Clicked += async (_, _) => await Reload();

        Content = new VerticalStackLayout { Padding = 16, Children = { refresh, _list } };
        Appearing += async (_, _) => await Reload();
    }

    private async void OpenPlayer(LibraryItem item)
    {
        // 탭 자식엔 NavigationPage 가 없어 PushAsync 불가 → 루트에서 모달 push (닫기는 상단바 뒤로)
        await Application.Current!.MainPage!.Navigation.PushModalAsync(new NavigationPage(new PlayerPage(item)));
    }

    private async Task Reload()
    {
        if (!ApiClient.Instance.IsConfigured) { _list.ItemsSource = new[] { "먼저 연결하세요" }; return; }
        _list.ItemsSource = await ApiClient.Instance.GetLibraryAsync();
    }
}

/// <summary>M2 재생 페이지: Range 스트리밍 재생(MediaElement).</summary>
public sealed class PlayerPage : ContentPage
{
    private readonly CommunityToolkit.Maui.Views.MediaElement _media = new()
    {
        Aspect = Aspect.AspectFit,
        ShouldAutoPlay = true,
        ShouldShowPlaybackControls = true,
    };

    public PlayerPage(LibraryItem item)
    {
        Title = item.FileName;
        _media.Source = CommunityToolkit.Maui.Views.MediaSource.FromUri(ApiClient.Instance.StreamUrl(item));
        Content = _media;
    }

    protected override void OnDisappearing()
    {
        _media.Stop();
        _media.Handler?.DisconnectHandler(); // 재생 리소스 해제
        base.OnDisappearing();
    }
}