// 使用 import.meta.glob 动态导入 themes 目录下的所有 .js 文件
// { eager: true } 表示同步导入，立即获取模块内容
const themeModules = import.meta.glob('./themes/*.js', { eager: true });

// 构建 themes 对象，确保 default 优先
export const themes = {};
const defaultPath = './themes/default.js';

// 1. 首先处理 default 主题
if (themeModules[defaultPath] && themeModules[defaultPath].default) {
    themes['default'] = themeModules[defaultPath].default;
}

// 2. 处理其他主题
for (const path in themeModules) {
    // 跳过已经处理过的 default 主题
    if (path === defaultPath) continue;

    // 从路径中提取主题名称 (e.g., './themes/default.js' -> 'default')
    const themeName = path.replace('./themes/', '').replace('.js', '');
    // 获取模块的默认导出 (即主题配置对象)
    if (themeModules[path].default) {
        themes[themeName] = themeModules[path].default;
    }
}

// --- Color Manipulation Helpers ---

/** Converts HEX color to RGB object */
function hexToRgb(hex) {
  let shorthandRegex = /^#?([a-f\d])([a-f\d])([a-f\d])$/i;
  hex = hex.replace(shorthandRegex, function(m, r, g, b) {
    return r + r + g + g + b + b;
  });
  let result = /^#?([a-f\d]{2})([a-f\d]{2})([a-f\d]{2})$/i.exec(hex);
  return result ? {
    r: parseInt(result[1], 16),
    g: parseInt(result[2], 16),
    b: parseInt(result[3], 16)
  } : null;
}

/** Converts RGB object to HEX color */
function rgbToHex(r, g, b) {
  return "#" + ((1 << 24) + (r << 16) + (g << 8) + b).toString(16).slice(1).toUpperCase();
}

/** Mixes two colors (RGB objects) */
function mixColors(rgb1, rgb2, weight) {
  weight = Math.max(0, Math.min(1, weight));
  let w1 = weight;
  let w2 = 1 - weight;
  return {
    r: Math.round(rgb1.r * w1 + rgb2.r * w2),
    g: Math.round(rgb1.g * w1 + rgb2.g * w2),
    b: Math.round(rgb1.b * w1 + rgb2.b * w2)
  };
}

// --- End Color Helpers ---

// Helper function to apply display mode
export function applyDisplayMode(mode) {
  const prefersDark = window.matchMedia && window.matchMedia('(prefers-color-scheme: dark)').matches;
  let darkModeEnabled = false;

  if (mode === 'dark') {
    darkModeEnabled = true;
  } else if (mode === 'system') {
    darkModeEnabled = prefersDark;
  } // else mode === 'light', darkModeEnabled remains false

  if (darkModeEnabled) {
    document.documentElement.classList.add('dark');
  } else {
    document.documentElement.classList.remove('dark');
  }
}

// --- Modified setTheme Function ---
export function setTheme(themeName) {
  // 确保 themeName 是字符串类型
  const themeKey = typeof themeName === 'string' ? themeName : 'default';
  const theme = themes[themeKey] || themes.default // Fallback to default
  if (!theme) {
    console.error(`Theme "${themeKey}" not found.`);
    return;
  }

  const root = document.documentElement
  const white = { r: 255, g: 255, b: 255 }; // RGB for white
  const black = { r: 0, g: 0, b: 0 };     // RGB for black

  // 设置主题色变量 (包括 primary 的派生色)
  Object.keys(theme).forEach(key => {
    const colorHex = theme[key];
    if (!colorHex) return; // Skip if color is undefined

    root.style.setProperty(`--el-color-${key}`, colorHex);

    // Calculate and set shades/darken for primary color
    if (key === 'primary') {
      try {
        const primaryRgb = hexToRgb(colorHex);
        if (!primaryRgb) throw new Error('Invalid primary hex color');

        // Set light shades (mix with white)
        for (let i = 1; i <= 9; i++) {
          const mixedRgb = mixColors(white, primaryRgb, i / 10);
          root.style.setProperty(`--el-color-primary-light-${i}`, rgbToHex(mixedRgb.r, mixedRgb.g, mixedRgb.b));
        }

        // Set dark shade - dark-2 (mix with black, 20%)
        const dark2Rgb = mixColors(black, primaryRgb, 0.2);
        root.style.setProperty(`--el-color-primary-dark-2`, rgbToHex(dark2Rgb.r, dark2Rgb.g, dark2Rgb.b));

        // Set dark shade - dark-1 (mix with black, 10%) - NEW
        const dark1Rgb = mixColors(black, primaryRgb, 0.1); 
        root.style.setProperty(`--el-color-primary-dark-1`, rgbToHex(dark1Rgb.r, dark1Rgb.g, dark1Rgb.b));

      } catch (error) {
        console.error(`Failed to generate shades for primary color ${colorHex}:`, error);
      }
    }
    // --- TODO: Optionally add shade generation for success, warning, danger, info here --- 
    // Example for success:
    /*
    else if (key === 'success') {
       try {
           const successRgb = hexToRgb(colorHex);
            if (!successRgb) throw new Error('Invalid success hex color');
            for (let i = 1; i <= 9; i++) {
                const mixedRgb = mixColors(white, successRgb, i / 10);
                root.style.setProperty(`--el-color-success-light-${i}`, rgbToHex(mixedRgb.r, mixedRgb.g, mixedRgb.b));
            }
            // Add dark-2 if needed
        } catch (error) {
           console.error(`Failed to generate shades for success color ${colorHex}:`, error);
        }
    }
    */
    // Repeat for warning, danger, info if necessary based on your themes
  });
  
  // 设置主题类名
  const currentThemeClass = Array.from(document.body.classList).find(cls => cls.startsWith('theme-'));
  if (currentThemeClass) {
    document.body.classList.remove(currentThemeClass);
  }
  document.body.classList.add(`theme-${themeKey}`);
}