using System.Timers;
using DataModel.Database;
using Processor;
using UI_WinForms.Resources;
using Timer = System.Timers.Timer;

namespace UI_WinForms.Components;

public sealed partial class Translation : UserControl
{
    private readonly string culture = "en-US";
    private readonly Timer saveTimer;
    private readonly Timer translationTimer;
    
    private bool isLoading = false;
    private int currentTranslationId = -1;
    private bool isDeepLSourceCulture = false;
    private Translation? mainCultureTranslation = null;

    public Translation()
    {
        this.InitializeComponent();
        this.Dock = DockStyle.Top;
    }

    public Translation(AppSettings.CultureInfo cultureInfo)
    {
        this.InitializeComponent();
        this.culture = cultureInfo.Code;
        this.labelHead.Text = $"Culture: {cultureInfo.Code}";
        this.Dock = DockStyle.Top;
        this.saveTimer = new Timer
        {
            Enabled = false, // disable timer for now,
            Interval = 1_000, // 1 second interval,
            AutoReset = false, // runs only once
        };
        this.translationTimer = new Timer
        {
            Enabled = false, // disable timer for now,
            Interval = 1_600, // 1.6 second interval,
            AutoReset = false, // runs only once
        };
        this.saveTimer.Elapsed += this.SaveChanges;
        this.translationTimer.Elapsed += this.TriggerTranslateNow;
        this.Load += async (sender, args) => await this.LateSetup(cultureInfo);
    }

    private async Task LateSetup(AppSettings.CultureInfo cultureInfo)
    {
        this.isDeepLSourceCulture = await AppSettings.GetDeepLSourceCultureIndex() == cultureInfo.Index;
        this.buttonDeepL.Visible = await AppSettings.GetDeepLMode() != SettingDeepLMode.DISABLED;
        this.buttonDeepL.Image = this.isDeepLSourceCulture ? Icons.icons8_trigger_1__svg : Icons.deepl_logo_icon_170284;

        if (this.isDeepLSourceCulture)
        {
            this.labelHead.Text = $"Culture: {cultureInfo.Code} (DeepL source culture)";
            this.toolTip.SetToolTip(this.buttonDeepL, "Replaces all other translations by DeepL translations using this culture as source culture.\nWarning: already translated texts will be replaced as well.");
            if(this.Parent.Parent is Translations translations)
                translations.RegisterMainCultureTranslationComponent(this);
        }
    }

    public async Task Configure(DataModel.Database.Translation translation)
    {
        this.isLoading = true;
        
        this.currentTranslationId = translation.Id;
        this.textBox.Text = translation.Text;
        this.textBox.Multiline = translation.TextElement.IsMultiLine;
        this.Height = translation.TextElement.IsMultiLine ? 280 : 106;
        this.buttonDeepL.Visible = await AppSettings.GetDeepLMode() != SettingDeepLMode.DISABLED;

        this.isLoading = false;
    }

    public void Clear()
    {
        this.isLoading = true;
        
        this.currentTranslationId = -1;
        this.textBox.Text = string.Empty;
        this.textBox.Multiline = true;
        this.Height = 280;
        
        this.isLoading = false;
    }

    private async void textBox_TextChanged(object sender, EventArgs e)
    {
        if(this.isLoading)
            return;
        
        if(this.saveTimer.Enabled)
            this.saveTimer.Stop();
        
        this.saveTimer.Start();
        if(this.ParentForm is UI_WinForms.Main main)
            main.AddDeferredSaveOperation(this.currentTranslationId, () => this.SaveChanges(null, null));

        if (this.isDeepLSourceCulture && await AppSettings.GetDeepLAction() == SettingDeepLAction.AUTOMATIC_ALL)
        {
            if (this.translationTimer.Enabled)
                this.translationTimer.Stop();
            this.translationTimer.Start();
        }
    }
    
    private async void SaveChanges(object? sender, ElapsedEventArgs e)
    {
        if (this.currentTranslationId > -1)
            await TranslationProcessor.SaveChangedTranslation(this.currentTranslationId, this.textBox.Text);
        
        if(this.ParentForm is UI_WinForms.Main main)
            main.RemoveDeferredSaveOperation(this.currentTranslationId);
    }

    private async void TriggerTranslateNow(object? sender, ElapsedEventArgs e)
    {
        if (this.currentTranslationId < 0 || this.isDeepLSourceCulture == false)
            return;
        
        if(this.Parent.Parent is Translations translations)
            await translations.MainCultureWasChanged();
    }

    internal void SetMainCultureTranslation(Translation translation) => this.mainCultureTranslation = translation;
    
    internal string GetCurrentText() => this.textBox.Text;
    
    internal async Task Translate()
    {
        if (this.mainCultureTranslation is null)
            return;
        
        var text = await Processor.DeepL.Translate(this.mainCultureTranslation.GetCurrentText(), this.culture);
        if (this.textBox.InvokeRequired)
            this.textBox.Invoke(() => this.textBox.Text = text);
        else
            this.textBox.Text = text;
    }

    private async void buttonDeepL_Click(object sender, EventArgs e)
    {
        if (this.isDeepLSourceCulture)
            this.TriggerTranslateNow(null, null);
        else
            await this.Translate();
    }
}