using System;
using System.Collections.Generic;
using System.Windows.Input;

namespace Paca.App.Core;

public static class GlobalHotkeyParser
{
    public static bool TryParse(string rawShortcut, out ModifierKeys modifiers, out Key key)
    {
        modifiers = ModifierKeys.None;
        key = Key.None;

        if (string.IsNullOrWhiteSpace(rawShortcut)) return false;

        var parts = rawShortcut.Split('+', StringSplitOptions.TrimEntries | StringSplitOptions.RemoveEmptyEntries);
        if (parts.Length == 0) return false;

        for (int i = 0; i < parts.Length; i++)
        {
            var p = parts[i];
            if (string.Equals(p, "Ctrl", StringComparison.OrdinalIgnoreCase) ||
                string.Equals(p, "Control", StringComparison.OrdinalIgnoreCase))
            {
                modifiers |= ModifierKeys.Control;
            }
            else if (string.Equals(p, "Alt", StringComparison.OrdinalIgnoreCase))
            {
                modifiers |= ModifierKeys.Alt;
            }
            else if (string.Equals(p, "Shift", StringComparison.OrdinalIgnoreCase))
            {
                modifiers |= ModifierKeys.Shift;
            }
            else if (string.Equals(p, "Win", StringComparison.OrdinalIgnoreCase) ||
                     string.Equals(p, "Windows", StringComparison.OrdinalIgnoreCase))
            {
                modifiers |= ModifierKeys.Windows;
            }
            else
            {
                if (Enum.TryParse<Key>(p, true, out var parsedKey))
                {
                    key = parsedKey;
                }
            }
        }

        return key != Key.None;
    }
}

public class GlobalHotkeyManager
{
    private readonly Dictionary<string, Action> _callbacks = new(StringComparer.OrdinalIgnoreCase);

    public static uint GetWin32ModifierFlags(ModifierKeys modifiers)
    {
        uint flags = 0;
        if (modifiers.HasFlag(ModifierKeys.Alt)) flags |= 0x0001;
        if (modifiers.HasFlag(ModifierKeys.Control)) flags |= 0x0002;
        if (modifiers.HasFlag(ModifierKeys.Shift)) flags |= 0x0004;
        if (modifiers.HasFlag(ModifierKeys.Windows)) flags |= 0x0008;
        return flags;
    }

    public void RegisterVirtualHotkey(string shortcut, Action callback)
    {
        if (string.IsNullOrWhiteSpace(shortcut) || callback == null) return;
        _callbacks[shortcut] = callback;
    }

    public bool SimulateHotkeyTrigger(string shortcut)
    {
        if (_callbacks.TryGetValue(shortcut, out var action))
        {
            action();
            return true;
        }
        return false;
    }
}