using System;
using System.Text.RegularExpressions;
using System.Threading.Tasks;
using Microsoft.Extensions.DependencyInjection;
using Microsoft.Web.WebView2.Core;
using Newtonsoft.Json;
using Windows.UI.ViewManagement.Core;
using Windows.UI.Xaml;
using Windows.UI.Xaml.Controls;
using Wino.Core.Domain;
using Wino.Core.Domain.Entities;
using Wino.Core.Domain.Interfaces;
using Wino.Views.Settings;

namespace Wino.Dialogs
{
    public sealed partial class SignatureEditorDialog : ContentDialog
    {
        private Func<Task<string>> _getHTMLBodyFunction;
        private readonly TaskCompletionSource<bool> _domLoadedTask = new TaskCompletionSource<bool>();
        private readonly INativeAppService _nativeAppService = App.Current.Services.GetService<INativeAppService>();
        public AccountSignature Result;

        public bool IsComposerDarkMode
        {
            get { return (bool)GetValue(IsComposerDarkModeProperty); }
            set { SetValue(IsComposerDarkModeProperty, value); }
        }

        public static readonly DependencyProperty IsComposerDarkModeProperty = DependencyProperty.Register(nameof(IsComposerDarkMode), typeof(bool), typeof(SignatureManagementPage), new PropertyMetadata(false, OnIsComposerDarkModeChanged));

        public SignatureEditorDialog()
        {
            InitializeComponent();

            SignatureNameTextBox.Header = Translator.SignatureEditorDialog_SignatureName_TitleNew;
            Environment.SetEnvironmentVariable("WEBVIEW2_DEFAULT_BACKGROUND_COLOR", "00FFFFFF");
            Environment.SetEnvironmentVariable("WEBVIEW2_ADDITIONAL_BROWSER_ARGUMENTS", "--enable-features=OverlayScrollbar,msOverlayScrollbarWinStyle,msOverlayScrollbarWinStyleAnimation");

            // TODO: Should be added additional logic to enable/disable primary button when webview content changed.
            IsPrimaryButtonEnabled = true;
        }

        public SignatureEditorDialog(AccountSignature signatureModel)
        {
            InitializeComponent();

            SignatureNameTextBox.Text = signatureModel.Name.Trim();
            SignatureNameTextBox.Header = string.Format(Translator.SignatureEditorDialog_SignatureName_TitleEdit, signatureModel.Name);

            Result = new AccountSignature
            {
                Id = signatureModel.Id,
                Name = signatureModel.Name,
                MailAccountId = signatureModel.MailAccountId,
                HtmlBody = signatureModel.HtmlBody
            };
            Environment.SetEnvironmentVariable("WEBVIEW2_DEFAULT_BACKGROUND_COLOR", "00FFFFFF");
            Environment.SetEnvironmentVariable("WEBVIEW2_ADDITIONAL_BROWSER_ARGUMENTS", "--enable-features=OverlayScrollbar,msOverlayScrollbarWinStyle,msOverlayScrollbarWinStyleAnimation");

            // TODO: Should be added additional logic to enable/disable primary button when webview content changed.
            IsPrimaryButtonEnabled = true;
        }

        private async void SignatureDialogOpened(ContentDialog sender, ContentDialogOpenedEventArgs args)
        {
            Chromium.CoreWebView2Initialized -= ChromiumInitialized;
            Chromium.CoreWebView2Initialized += ChromiumInitialized;

            await Chromium.EnsureCoreWebView2Async();

            _getHTMLBodyFunction = new Func<Task<string>>(async () =>
            {
                var quillContent = await InvokeScriptSafeAsync("GetHTMLContent();");

                return JsonConvert.DeserializeObject<string>(quillContent);
            });

            var underlyingThemeService = App.Current.Services.GetService<IUnderlyingThemeService>();

            IsComposerDarkMode = underlyingThemeService.IsUnderlyingThemeDark();

            await RenderInternalAsync(Result?.HtmlBody ?? string.Empty);
        }

        private void DialogClosed(ContentDialog sender, ContentDialogClosedEventArgs args)
        {
            Chromium.CoreWebView2Initialized -= ChromiumInitialized;

            if (Chromium.CoreWebView2 != null)
            {
                Chromium.CoreWebView2.DOMContentLoaded -= DOMLoaded;
                Chromium.CoreWebView2.WebMessageReceived -= ScriptMessageReceived;
            }
        }

        private async void SaveClicked(ContentDialog sender, ContentDialogButtonClickEventArgs args)
        {
            var newSignature = Regex.Unescape(await _getHTMLBodyFunction());

            if (Result == null)
            {
                Result = new AccountSignature
                {
                    Id = Guid.NewGuid(),
                    Name = SignatureNameTextBox.Text.Trim(),
                    HtmlBody = newSignature
                };
            }
            else
            {
                Result.Name = SignatureNameTextBox.Text.Trim();
                Result.HtmlBody = newSignature;
            }

            Hide();
        }

        private void CancelClicked(ContentDialog sender, ContentDialogButtonClickEventArgs args)
        {
            Hide();
        }

        private async void HyperlinkAddClicked(object sender, RoutedEventArgs e)
        {
            await InvokeScriptSafeAsync($"addHyperlink('{LinkUrlTextBox.Text}')");

            LinkUrlTextBox.Text = string.Empty;
            HyperlinkFlyout.Hide();
        }

        private async void BoldButtonClicked(object sender, RoutedEventArgs e)
        {
            await InvokeScriptSafeAsync("document.getElementById('boldButton').click();");
        }

        private async void ItalicButtonClicked(object sender, RoutedEventArgs e)
        {
            await InvokeScriptSafeAsync("document.getElementById('italicButton').click();");
        }

        private async void UnderlineButtonClicked(object sender, RoutedEventArgs e)
        {
            await InvokeScriptSafeAsync("document.getElementById('underlineButton').click();");
        }

        private async void StrokeButtonClicked(object sender, RoutedEventArgs e)
        {
            await InvokeScriptSafeAsync("document.getElementById('strikeButton').click();");
        }

        private async void BulletListButtonClicked(object sender, RoutedEventArgs e)
        {
            await InvokeScriptSafeAsync("document.getElementById('bulletListButton').click();");
        }

        private async void OrderedListButtonClicked(object sender, RoutedEventArgs e)
        {
            await InvokeScriptSafeAsync("document.getElementById('orderedListButton').click();");
        }

        private async void IncreaseIndentClicked(object sender, RoutedEventArgs e)
        {
            await InvokeScriptSafeAsync("document.getElementById('increaseIndentButton').click();");
        }

        private async void DecreaseIndentClicked(object sender, RoutedEventArgs e)
        {
            await InvokeScriptSafeAsync("document.getElementById('decreaseIndentButton').click();");
        }

        private async void DirectionButtonClicked(object sender, RoutedEventArgs e)
        {
            await InvokeScriptSafeAsync("document.getElementById('directionButton').click();");
        }

        private async void AlignmentChanged(object sender, SelectionChangedEventArgs e)
        {
            var selectedItem = AlignmentListView.SelectedItem as ComboBoxItem;
            var alignment = selectedItem.Tag.ToString();

            switch (alignment)
            {
                case "left":
                    await InvokeScriptSafeAsync("document.getElementById('ql-align-left').click();");
                    break;
                case "center":
                    await InvokeScriptSafeAsync("document.getElementById('ql-align-center').click();");
                    break;
                case "right":
                    await InvokeScriptSafeAsync("document.getElementById('ql-align-right').click();");
                    break;
                case "justify":
                    await InvokeScriptSafeAsync("document.getElementById('ql-align-justify').click();");
                    break;
            }
        }

        public async Task<string> ExecuteScriptFunctionAsync(string functionName, params object[] parameters)
        {
            string script = functionName + "(";
            for (int i = 0; i < parameters.Length; i++)
            {
                script += JsonConvert.SerializeObject(parameters[i]);
                if (i < parameters.Length - 1)
                {
                    script += ", ";
                }
            }
            script += ");";

            return await Chromium.ExecuteScriptAsync(script);
        }

        private async Task<string> InvokeScriptSafeAsync(string function)
        {
            try
            {
                return await Chromium.ExecuteScriptAsync(function);
            }
            catch { }

            return string.Empty;
        }

        private async void AddImageClicked(object sender, RoutedEventArgs e)
        {
            await InvokeScriptSafeAsync("document.getElementById('addImageButton').click();");
        }

        private async Task FocusEditorAsync()
        {
            await InvokeScriptSafeAsync("quill.focus();");

            Chromium.Focus(FocusState.Keyboard);
            Chromium.Focus(FocusState.Programmatic);
        }

        private async void EmojiButtonClicked(object sender, RoutedEventArgs e)
        {
            CoreInputView.GetForCurrentView().TryShow(CoreInputViewKind.Emoji);

            await FocusEditorAsync();
        }

        private async Task<string> TryGetSelectedTextAsync()
        {
            try
            {
                return await Chromium.ExecuteScriptAsync("getSelectedText();");
            }
            catch { }

            return string.Empty;
        }

        private async void LinkButtonClicked(object sender, RoutedEventArgs e)
        {
            // Get selected text from Quill.
            HyperlinkTextBox.Text = await TryGetSelectedTextAsync();

            HyperlinkFlyout.ShowAt(LinkButton);
        }

        private async Task UpdateEditorThemeAsync()
        {
            await _domLoadedTask.Task;

            if (IsComposerDarkMode)
            {
                Chromium.CoreWebView2.Profile.PreferredColorScheme = CoreWebView2PreferredColorScheme.Dark;
                await InvokeScriptSafeAsync("SetDarkEditor();");
            }
            else
            {
                Chromium.CoreWebView2.Profile.PreferredColorScheme = CoreWebView2PreferredColorScheme.Light;
                await InvokeScriptSafeAsync("SetLightEditor();");
            }
        }

        private async Task RenderInternalAsync(string htmlBody)
        {
            await _domLoadedTask.Task;

            await UpdateEditorThemeAsync();

            if (string.IsNullOrEmpty(htmlBody))
            {
                await ExecuteScriptFunctionAsync("RenderHTML", " ");
            }
            else
            {
                await ExecuteScriptFunctionAsync("RenderHTML", htmlBody);

                await FocusEditorAsync();
            }
        }

        private async void ChromiumInitialized(Microsoft.UI.Xaml.Controls.WebView2 sender, Microsoft.UI.Xaml.Controls.CoreWebView2InitializedEventArgs args)
        {
            var editorBundlePath = (await _nativeAppService.GetQuillEditorBundlePathAsync()).Replace("editor.html", string.Empty);

            Chromium.CoreWebView2.SetVirtualHostNameToFolderMapping("app.editor", editorBundlePath, CoreWebView2HostResourceAccessKind.Allow);
            Chromium.Source = new Uri("https://app.editor/editor.html");

            Chromium.CoreWebView2.DOMContentLoaded -= DOMLoaded;
            Chromium.CoreWebView2.DOMContentLoaded += DOMLoaded;

            Chromium.CoreWebView2.WebMessageReceived -= ScriptMessageReceived;
            Chromium.CoreWebView2.WebMessageReceived += ScriptMessageReceived;
        }

        private static async void OnIsComposerDarkModeChanged(DependencyObject obj, DependencyPropertyChangedEventArgs args)
        {
            if (obj is SignatureEditorDialog dialog)
            {
                await dialog.UpdateEditorThemeAsync();
            }
        }

        private void ScriptMessageReceived(CoreWebView2 sender, CoreWebView2WebMessageReceivedEventArgs args)
        {
            var change = JsonConvert.DeserializeObject<string>(args.WebMessageAsJson);

            bool isEnabled = change.EndsWith("ql-active");

            if (change.StartsWith("ql-bold"))
                BoldButton.IsChecked = isEnabled;
            else if (change.StartsWith("ql-italic"))
                ItalicButton.IsChecked = isEnabled;
            else if (change.StartsWith("ql-underline"))
                UnderlineButton.IsChecked = isEnabled;
            else if (change.StartsWith("ql-strike"))
                StrokeButton.IsChecked = isEnabled;
            else if (change.StartsWith("orderedListButton"))
                OrderedListButton.IsChecked = isEnabled;
            else if (change.StartsWith("bulletListButton"))
                BulletListButton.IsChecked = isEnabled;
            else if (change.StartsWith("ql-direction"))
                DirectionButton.IsChecked = isEnabled;
            else if (change.StartsWith("ql-align-left"))
            {
                AlignmentListView.SelectionChanged -= AlignmentChanged;
                AlignmentListView.SelectedIndex = 0;
                AlignmentListView.SelectionChanged += AlignmentChanged;
            }
            else if (change.StartsWith("ql-align-center"))
            {
                AlignmentListView.SelectionChanged -= AlignmentChanged;
                AlignmentListView.SelectedIndex = 1;
                AlignmentListView.SelectionChanged += AlignmentChanged;
            }
            else if (change.StartsWith("ql-align-right"))
            {
                AlignmentListView.SelectionChanged -= AlignmentChanged;
                AlignmentListView.SelectedIndex = 2;
                AlignmentListView.SelectionChanged += AlignmentChanged;
            }
            else if (change.StartsWith("ql-align-justify"))
            {
                AlignmentListView.SelectionChanged -= AlignmentChanged;
                AlignmentListView.SelectedIndex = 3;
                AlignmentListView.SelectionChanged += AlignmentChanged;
            }
        }

        private void DOMLoaded(CoreWebView2 sender, CoreWebView2DOMContentLoadedEventArgs args) => _domLoadedTask.TrySetResult(true);

        private void SignatureNameTextBoxTextChanged(object sender, TextChangedEventArgs e) => IsPrimaryButtonEnabled = !string.IsNullOrWhiteSpace(SignatureNameTextBox.Text);

        private void InvertComposerThemeClicked(object sender, RoutedEventArgs e) => IsComposerDarkMode = !IsComposerDarkMode;
    }
}