using System;
using System.Collections.Generic;
using System.Globalization;
using System.IO;

using Avalonia.Controls;
using Avalonia.Input;
using Avalonia.Interactivity;
using Avalonia.Media;
using Avalonia.Platform.Storage;

namespace SourceGit.Views
{
    public partial class Preference : Window
    {
        public List<FontFamily> InstalledFonts
        {
            get;
            private set;
        }

        public List<FontFamily> InstalledMonospaceFonts
        {
            get;
            private set;
        }

        public string DefaultUser
        {
            get;
            set;
        }

        public string DefaultEmail
        {
            get;
            set;
        }

        public Models.CRLFMode CRLFMode
        {
            get;
            set;
        }

        public bool EnableGPGSigning
        {
            get;
            set;
        }

        public string GPGExecutableFile
        {
            get;
            set;
        }

        public string GPGUserKey
        {
            get;
            set;
        }

        public Preference()
        {
            var pref = ViewModels.Preference.Instance;
            DataContext = pref;

            InstalledFonts = new List<FontFamily>();
            InstalledFonts.Add(new FontFamily("fonts:SourceGit#JetBrains Mono"));
            InstalledFonts.AddRange(FontManager.Current.SystemFonts);
            InstalledFonts.Remove(FontManager.Current.DefaultFontFamily);
            InstalledFonts.Add(FontManager.Current.DefaultFontFamily);

            InstalledMonospaceFonts = new List<FontFamily>();
            InstalledMonospaceFonts.Add(new FontFamily("fonts:SourceGit#JetBrains Mono"));
            foreach (var font in FontManager.Current.SystemFonts)
            {
                var typeface = new Typeface(font);
                var testI = new FormattedText(
                            "i",
                            CultureInfo.CurrentCulture,
                            FlowDirection.LeftToRight,
                            typeface,
                            12,
                            Brushes.White);
                var testW = new FormattedText(
                            "W",
                            CultureInfo.CurrentCulture,
                            FlowDirection.LeftToRight,
                            typeface,
                            12,
                            Brushes.White);
                if (testI.Width == testW.Width)
                {
                    InstalledMonospaceFonts.Add(font);
                }
            }

            var ver = string.Empty;
            if (pref.IsGitConfigured)
            {
                var config = new Commands.Config(null).ListAll();

                if (config.ContainsKey("user.name")) DefaultUser = config["user.name"];
                if (config.ContainsKey("user.email")) DefaultEmail = config["user.email"];
                if (config.ContainsKey("user.signingkey")) GPGUserKey = config["user.signingkey"];
                if (config.ContainsKey("core.autocrlf")) CRLFMode = Models.CRLFMode.Supported.Find(x => x.Value == config["core.autocrlf"]);
                if (config.ContainsKey("commit.gpgsign")) EnableGPGSigning = (config["commit.gpgsign"] == "true");
                if (config.ContainsKey("gpg.program")) GPGExecutableFile = config["gpg.program"];

                ver = new Commands.Version().Query();
            }

            InitializeComponent();
            txtVersion.Text = ver;
        }

        private void BeginMoveWindow(object sender, PointerPressedEventArgs e)
        {
            BeginMoveDrag(e);
        }

        private void CloseWindow(object sender, RoutedEventArgs e)
        {
            var cmd = new Commands.Config(null);

            var config = cmd.ListAll();
            var oldUser = config.ContainsKey("user.name") ? config["user.name"] : string.Empty;
            var oldEmail = config.ContainsKey("user.email") ? config["user.email"] : string.Empty;
            var oldGPGSignKey = config.ContainsKey("user.signingkey") ? config["user.signingkey"] : string.Empty;
            var oldCRLF = config.ContainsKey("core.autocrlf") ? config["core.autocrlf"] : string.Empty;
            var oldGPGSignEnable = config.ContainsKey("commit.gpgsign") ? config["commit.gpgsign"] : "false";
            var oldGPGExec = config.ContainsKey("gpg.program") ? config["gpg.program"] : string.Empty;

            if (DefaultUser != oldUser) cmd.Set("user.name", DefaultUser);
            if (DefaultEmail != oldEmail) cmd.Set("user.email", DefaultEmail);
            if (GPGUserKey != oldGPGSignKey) cmd.Set("user.signingkey", GPGUserKey);
            if (CRLFMode != null && CRLFMode.Value != oldCRLF) cmd.Set("core.autocrlf", CRLFMode.Value);
            if (EnableGPGSigning != (oldGPGSignEnable == "true")) cmd.Set("commit.gpgsign", EnableGPGSigning ? "true" : "false");
            if (GPGExecutableFile != oldGPGExec) cmd.Set("gpg.program", GPGExecutableFile);

            Close();
        }

        private async void SelectGitExecutable(object sender, RoutedEventArgs e)
        {
            var pattern = OperatingSystem.IsWindows() ? "git.exe" : "git";
            var options = new FilePickerOpenOptions()
            {
                FileTypeFilter = [new FilePickerFileType("Git Executable") { Patterns = [pattern] }],
                AllowMultiple = false,
            };

            var selected = await StorageProvider.OpenFilePickerAsync(options);
            if (selected.Count == 1)
            {
                ViewModels.Preference.Instance.GitInstallPath = selected[0].Path.LocalPath;
                txtVersion.Text = new Commands.Version().Query();
            }

            e.Handled = true;
        }

        private async void SelectDefaultCloneDir(object sender, RoutedEventArgs e)
        {
            var options = new FolderPickerOpenOptions() { AllowMultiple = false };
            var selected = await StorageProvider.OpenFolderPickerAsync(options);
            if (selected.Count == 1)
            {
                ViewModels.Preference.Instance.GitDefaultCloneDir = selected[0].Path.LocalPath;
            }
        }

        private async void SelectGPGExecutable(object sender, RoutedEventArgs e)
        {
            var pattern = OperatingSystem.IsWindows() ? "gpg.exe" : "gpg";
            var options = new FilePickerOpenOptions()
            {
                FileTypeFilter = [new FilePickerFileType("GPG Executable") { Patterns = [pattern] }],
                AllowMultiple = false,
            };

            var selected = await StorageProvider.OpenFilePickerAsync(options);
            if (selected.Count == 1)
            {
                GPGExecutableFile = selected[0].Path.LocalPath;
            }
        }

        private async void SelectExternalMergeTool(object sender, RoutedEventArgs e)
        {
            var type = ViewModels.Preference.Instance.ExternalMergeToolType;
            if (type < 0 || type >= Models.ExternalMergeTools.Supported.Count)
            {
                ViewModels.Preference.Instance.ExternalMergeToolType = 0;
                type = 0;
            }

            var tool = Models.ExternalMergeTools.Supported[type];
            var pattern = Path.GetFileName(tool.Exec);
            var options = new FilePickerOpenOptions()
            {
                FileTypeFilter = [new FilePickerFileType(tool.Name) { Patterns = [pattern] }],
                AllowMultiple = false,
            };

            var selected = await StorageProvider.OpenFilePickerAsync(options);
            if (selected.Count == 1)
            {
                ViewModels.Preference.Instance.ExternalMergeToolPath = selected[0].Path.LocalPath;
            }
        }
    }
}