using System.Collections.Generic;
using Godot;

namespace Views;

/// <summary>
///     套装主题管理类
/// </summary>
public class SuitTheme {
    private readonly Dictionary<Res.Type, Sprite2D> _sprites = new();
    private readonly Dictionary<Res.Type, ushort> _theme = new();

    /// <summary>
    ///     是否使用16x16精灵
    /// </summary>
    public bool Use16 { get; set; }

    /// <summary>
    ///     是否为头像
    /// </summary>
    public bool IsPortrait { get; set; }

    /// <summary>
    ///     缓存组件精灵
    /// </summary>
    /// <param name="type">资源类型</param>
    /// <param name="sprite">精灵对象</param>
    public void CacheComponent(Res.Type type, Sprite2D sprite) {
        _sprites[type] = sprite;
        if (_theme.TryGetValue(type, out var value)) {
            sprite.Texture = ResourceLoader.Load<Texture2D>(Res.GetResourcePathWithId(value, type).Path);
        }
    }
    
    /// <summary>
    ///     解析主题ID
    /// </summary>
    /// <param name="themeId">主题ID</param>
    private void _extractThemeId(ulong themeId) {
        for (Res.Type typeId = 0; typeId < Res.Type.ResTypeMax; typeId++)
            _theme[typeId] = (ushort)((themeId >> (8 * (int)typeId)) & 0xfful);
    }

    /// <summary>
    ///     获取主题ID
    /// </summary>
    /// <returns>主题ID</returns>
    public ulong GetThemeId() {
        ulong result = 0;
        for (Res.Type typeId = 0; typeId < Res.Type.ResTypeMax; typeId++) {
            if (!_theme.TryGetValue(typeId, out var value)) continue;
            result |= (ulong)(value & 0xff) << (8 * (int)typeId);
        }

        return result;
    }

    /// <summary>
    ///     应用主题
    /// </summary>
    /// <param name="themeId">主题ID</param>
    public void ApplyTheme(ulong themeId) {
        _extractThemeId(themeId);
        foreach (var kvp in _sprites)
            if (_theme.TryGetValue(kvp.Key, out var value))
                kvp.Value.Texture = ResourceLoader.Load<Texture2D>(
                    Res.GetResourcePathWithId(value, kvp.Key, Use16, IsPortrait).Path
                );
    }

    /// <summary>
    ///     应用组件资源
    /// </summary>
    /// <param name="type">资源类型</param>
    /// <param name="resPath">资源路径对象</param>
    public void ApplyComponent(Res.Type type, Res.ResPathWithId resPath) {
        if (!_sprites.TryGetValue(type, out var value)) return;
        value.Texture = ResourceLoader.Load<Texture2D>(resPath.Path);
        _theme[type] = (ushort)resPath.Id;
    }

    /// <summary>
    ///     是否为空
    /// </summary>
    /// <returns>如果是空则返回true</returns>
    public bool IsEmpty() {
        return _sprites.Count == 0;
    }
}