/** 微信服务号数字订阅目录（仅限服务号客服消息推送）。 */

export const WECHAT_PUSH_SUBSCRIPTION_PREFIX = 'wechat_push';
export const LEGACY_MORNING_SOURCE = 'subscribe_morning_reminder';

export const PUSH_SUBSCRIPTION_ITEMS = Object.freeze([
  {
    id: 1,
    key: 'morning',
    emoji: '☀️',
    label: '早安问候',
    defaultHour: 8,
    defaultMinute: 0,
    aliases: ['早安', '问候'],
    deliveryReady: true,
  },
  {
    id: 2,
    key: 'news',
    emoji: '📰',
    label: '每日新闻早报',
    defaultHour: 7,
    defaultMinute: 30,
    aliases: ['新闻', '早报', '新闻早报'],
    deliveryReady: true,
  },
  {
    id: 3,
    key: 'weather',
    emoji: '🌤',
    label: '每日天气',
    defaultHour: 7,
    defaultMinute: 0,
    aliases: ['天气'],
    deliveryReady: true,
    requiresOptions: ['city'],
  },
  {
    id: 4,
    key: 'finance',
    emoji: '💰',
    label: '财经市场',
    defaultHour: 8,
    defaultMinute: 30,
    aliases: ['财经', '股市', '市场'],
    deliveryReady: true,
  },
  {
    id: 5,
    key: 'tech',
    emoji: '🤖',
    label: 'AI / 科技早报',
    defaultHour: 8,
    defaultMinute: 0,
    aliases: ['科技', 'AI', 'ai'],
    deliveryReady: true,
  },
  {
    id: 6,
    key: 'knowledge',
    emoji: '📚',
    label: '每日知识',
    defaultHour: 12,
    defaultMinute: 0,
    aliases: ['知识'],
    deliveryReady: true,
  },
  {
    id: 7,
    key: 'quote',
    emoji: '💡',
    label: '每日金句',
    defaultHour: 7,
    defaultMinute: 30,
    aliases: ['金句', '名言'],
    deliveryReady: true,
  },
  {
    id: 8,
    key: 'health',
    emoji: '🏃',
    label: '健康提醒',
    defaultHour: 10,
    defaultMinute: 0,
    aliases: ['健康'],
    deliveryReady: true,
  },
  {
    id: 9,
    key: 'night',
    emoji: '🌙',
    label: '晚安总结',
    defaultHour: 22,
    defaultMinute: 0,
    aliases: ['晚安'],
    deliveryReady: true,
  },
  {
    id: 10,
    key: 'surprise',
    emoji: '🎁',
    label: '每日惊喜',
    defaultHour: 18,
    defaultMinute: 0,
    aliases: ['惊喜'],
    deliveryReady: true,
  },
]);

const byId = new Map(PUSH_SUBSCRIPTION_ITEMS.map((item) => [item.id, item]));
const byKey = new Map(PUSH_SUBSCRIPTION_ITEMS.map((item) => [item.key, item]));

export function pushSubscriptionMetadataSource(key) {
  return `${WECHAT_PUSH_SUBSCRIPTION_PREFIX}:${String(key ?? '').trim()}`;
}

export function getPushSubscriptionById(id) {
  const num = Number(id);
  if (!Number.isInteger(num)) return null;
  return byId.get(num) ?? null;
}

export function getPushSubscriptionByKey(key) {
  const normalized = String(key ?? '').trim().toLowerCase();
  if (!normalized) return null;
  return byKey.get(normalized) ?? null;
}

export function resolvePushSubscriptionFromMetadataSource(source) {
  const raw = String(source ?? '').trim();
  if (!raw) return null;
  if (raw === LEGACY_MORNING_SOURCE) {
    return getPushSubscriptionByKey('morning');
  }
  const prefix = `${WECHAT_PUSH_SUBSCRIPTION_PREFIX}:`;
  if (!raw.startsWith(prefix)) return null;
  return getPushSubscriptionByKey(raw.slice(prefix.length));
}

export function resolvePushSubscriptionFromAlias(text) {
  const compact = String(text ?? '').replace(/\s+/g, '');
  if (!compact) return null;
  for (const item of PUSH_SUBSCRIPTION_ITEMS) {
    for (const alias of item.aliases) {
      if (compact.includes(alias)) return item;
    }
  }
  return null;
}

export function formatPushSubscriptionTimeLabel(hour, minute) {
  const safeHour = Number(hour);
  const safeMinute = Number(minute ?? 0);
  return `${String(safeHour).padStart(2, '0')}:${String(safeMinute).padStart(2, '0')}`;
}

export function formatPushSubscriptionMenuLine(item) {
  const timeLabel = formatPushSubscriptionTimeLabel(item.defaultHour, item.defaultMinute);
  return `${item.id} ${item.emoji} ${item.label}  默认 ${timeLabel}`;
}

export function buildPushSubscriptionMenuLines() {
  const lines = [
    '',
    '📬 每日推送订阅（仅限本服务号）',
    '回复数字即可开通，例如「2」或「2 7点」：',
    ...PUSH_SUBSCRIPTION_ITEMS.map((item) => formatPushSubscriptionMenuLine(item)),
    '',
    '· 查状态：回复「我的订阅」',
    '· 改时间：回复「2改到7点」',
    '· 取消：回复「取消2」',
    '· 天气城市：回复「3 北京」或「3改城市上海」',
    '· 帮助：回复「订阅帮助」',
  ];
  return lines;
}

export function isPushSubscriptionEnabled(env = process.env) {
  const explicit = env.H5_WECHAT_MP_PUSH_SUBSCRIPTION_ENABLED;
  if (explicit != null && String(explicit).trim() !== '') {
    return String(explicit).trim() !== '0';
  }
  return String(env.H5_WECHAT_MP_SUBSCRIBE_MORNING_REMINDER_ENABLED ?? '1').trim() !== '0';
}