/**
 * 前端双主题设计系统核心管理模块
 * 严格遵照 UI/UX 规范：无 Emoji、纯矢量、高对比度与 WCAG AA 标准
 */

export const THEME_KEYS = {
  COOL: 'cool',
  WARM: 'warm'
};

export const THEMES = {
  [THEME_KEYS.COOL]: {
    key: THEME_KEYS.COOL,
    name: '冷光暗夜',
    description: '深邃暗夜黑与电竞靛蓝流光，专业沉浸质感',
    tokens: {
      bgPrimary: '#0A0F1D',
      bgSurface: '#151D30',
      bgSurfaceElevated: '#1E2942',
      bgSurfaceGlass: 'rgba(21, 29, 48, 0.85)',
      colorBrand: '#6366F1',
      colorBrandLight: '#818CF8',
      colorBrandGold: '#F59E0B',
      colorBrandGlow: 'rgba(99, 102, 241, 0.35)',
      colorBrandGradient: 'linear-gradient(135deg, #6366F1, #8B5CF6)',
      borderSubtle: '#1E293B',
      borderFocus: '#4F46E5',
      textPrimary: '#F8FAFC',
      textSecondary: '#94A3B8',
      textMuted: '#64748B',
      shadowBrand: '0 8rpx 24rpx rgba(99, 102, 241, 0.35)'
    }
  },
  [THEME_KEYS.WARM]: {
    key: THEME_KEYS.WARM,
    name: '暖阳赤焰',
    description: '深邃暖焦糖褐与暖阳曜橙流光，热情温馨有活力',
    tokens: {
      bgPrimary: '#140E0A',
      bgSurface: '#221711',
      bgSurfaceElevated: '#2E1F17',
      bgSurfaceGlass: 'rgba(34, 23, 17, 0.85)',
      colorBrand: '#F97316',
      colorBrandLight: '#FB923C',
      colorBrandGold: '#F59E0B',
      colorBrandGlow: 'rgba(249, 115, 22, 0.35)',
      colorBrandGradient: 'linear-gradient(135deg, #F97316, #F59E0B)',
      borderSubtle: '#342217',
      borderFocus: '#EA580C',
      textPrimary: '#FFF7ED',
      textSecondary: '#C7B5A7',
      textMuted: '#8C7565',
      shadowBrand: '0 8rpx 24rpx rgba(249, 115, 22, 0.35)'
    }
  }
};

const STORAGE_KEY = 'peiwan_app_theme';

/**
 * 获取当前持久化的主题标识
 */
export function getCurrentThemeKey() {
  try {
    const saved = uni.getStorageSync(STORAGE_KEY);
    if (saved && THEMES[saved]) {
      return saved;
    }
  } catch (e) {
    // 忽略异常，降级到默认
  }
  return THEME_KEYS.COOL;
}

/**
 * 获取当前主题配置对象
 */
export function getCurrentTheme() {
  const key = getCurrentThemeKey();
  return THEMES[key];
}

/**
 * 获取当前主题 Tokens
 */
export function getCurrentTokens() {
  return getCurrentTheme().tokens;
}

/**
 * 切换全局主题并持久化，广播全局事件
 */
export function setTheme(themeKey) {
  const targetKey = THEMES[themeKey] ? themeKey : THEME_KEYS.COOL;
  try {
    uni.setStorageSync(STORAGE_KEY, targetKey);
  } catch (e) {
    // 忽略持久化异常
  }
  
  // 广播主题变更事件
  try {
    uni.$emit('theme-change', targetKey);
  } catch (e) {
    // 忽略事件抛出异常
  }
  
  return THEMES[targetKey];
}

/**
 * 获取所有可选主题列表
 */
export function getAvailableThemes() {
  return Object.values(THEMES);
}