import {
  buildPushSubscriptionMenuLines,
  getPushSubscriptionByKey,
} from '../push-subscription-catalog.mjs';
import { normalizePushWeatherCity } from '../push-content/weather-delivery.mjs';
import {
  parsePushSubscriptionCancelRequest,
  parsePushSubscriptionCityUpdate,
  parsePushSubscriptionConfirmReply,
  parsePushSubscriptionHelpRequest,
  parsePushSubscriptionListRequest,
  parsePushSubscriptionModifyRequest,
  resolvePushSubscriptionConfirmTime,
} from '../push-subscription-parser.mjs';
import {
  cancelAllPushSubscriptions,
  cancelPushSubscription,
  commitPushSubscription,
  findActivePushSubscription,
  formatPushSubscriptionAlreadyActiveReply,
  formatPushSubscriptionBindFirstReply,
  formatPushSubscriptionCancelledAllReply,
  formatPushSubscriptionCancelledReply,
  formatPushSubscriptionCityUpdatedReply,
  formatPushSubscriptionCommittedReply,
  formatPushSubscriptionListReply,
  formatPushSubscriptionModifyHelpReply,
  formatPushSubscriptionNotReadyReply,
  formatPushSubscriptionUpdatedReply,
  listActivePushSubscriptions,
  updatePushSubscriptionOptions,
  updatePushSubscriptionTime,
} from '../push-subscription-service.mjs';
import { resolveSubscribeMorningLlmIntent } from '../../wechat-subscribe-morning-llm.mjs';
import { formatNewsMorningPushDelivery } from '../push-content/news-morning-delivery.mjs';
import { parsePushSubscriptionSecretCode } from '../push-subscription-secret-codes.mjs';
import {
  canCommitPushSubscriptionForSuspendedUser,
  isSuspendedBillingUser,
} from '../suspended-user-push-policy.mjs';

async function tryCommitSubscription({
  userId,
  scheduleService,
  catalogItem,
  hour,
  minute,
  timezone,
  bindUrl,
  boundUser,
  sourceMessageId,
  sourceText,
  options = null,
  logger,
}) {
  if (!boundUser?.userId) {
    return formatPushSubscriptionBindFirstReply({ bindUrl });
  }
  if (!catalogItem.deliveryReady) {
    return formatPushSubscriptionNotReadyReply({ catalogItem });
  }
  if (
    isSuspendedBillingUser(boundUser)
    && !canCommitPushSubscriptionForSuspendedUser(catalogItem.key)
  ) {
    return '账户已欠费停用，暂仅保留早安问候与每日天气推送。请先充值后再开通其它订阅。';
  }
  if (!scheduleService) {
    return '当前暂无法设置每日推送，请稍后再试。';
  }

  const existing = await findActivePushSubscription({
    userId: boundUser.userId,
    scheduleService,
    catalogItem,
  });
  if (existing) {
    return formatPushSubscriptionAlreadyActiveReply({
      catalogItem,
      hour: existing.hour,
      minute: existing.minute,
    });
  }

  try {
    await commitPushSubscription({
      userId: boundUser.userId,
      scheduleService,
      catalogItem,
      hour,
      minute,
      timezone,
      sourceMessageId,
      sourceText,
      options,
    });
    return formatPushSubscriptionCommittedReply({ catalogItem, hour, minute, options });
  } catch (err) {
    logger.warn?.(
      '[push-subscription] commit failed:',
      err instanceof Error ? err.message : err,
    );
    return `订阅设置失败：${err instanceof Error ? err.message : String(err)}`;
  }
}

async function handleMorningLlmPendingTurn({
  text,
  boundUser,
  scheduleService,
  timezone,
  defaultHour,
  defaultMinute,
  bindUrl,
  sourceMessageId,
  wechatSubscribeMorningLlmConfigService,
  llmProviderService,
  logger,
}) {
  const morningItem = getPushSubscriptionByKey('morning');
  if (!morningItem) return null;

  const llmIntent = await resolveSubscribeMorningLlmIntent({
    text,
    phase: 'pending',
    defaultHour,
    defaultMinute,
    wechatSubscribeMorningLlmConfigService,
    llmProviderService,
    logger,
  }).catch(() => null);

  if (llmIntent?.action === 'confirm') {
    return tryCommitSubscription({
      userId: boundUser?.userId,
      scheduleService,
      catalogItem: morningItem,
      hour: llmIntent.hour,
      minute: llmIntent.minute,
      timezone,
      bindUrl,
      boundUser,
      sourceMessageId,
      sourceText: String(text ?? ''),
      logger,
    });
  }
  if (llmIntent?.action === 'cancel') {
    return '好的，未开启每日早安提醒。';
  }
  if (llmIntent?.action === 'clarify' && llmIntent.message) {
    return llmIntent.message;
  }
  return null;
}

async function handleMorningLlmManageTurn({
  text,
  boundUser,
  scheduleService,
  timezone,
  defaultHour,
  defaultMinute,
  wechatSubscribeMorningLlmConfigService,
  llmProviderService,
  logger,
}) {
  const morningItem = getPushSubscriptionByKey('morning');
  if (!morningItem || !boundUser?.userId || !scheduleService) return null;

  const active = await findActivePushSubscription({
    userId: boundUser.userId,
    scheduleService,
    catalogItem: morningItem,
  });
  if (!active) return null;

  const llmIntent = await resolveSubscribeMorningLlmIntent({
    text,
    phase: 'active',
    defaultHour,
    defaultMinute,
    currentHour: active.hour,
    currentMinute: active.minute,
    wechatSubscribeMorningLlmConfigService,
    llmProviderService,
    logger,
  }).catch(() => null);

  if (llmIntent?.action === 'cancel') {
    try {
      await cancelPushSubscription({
        userId: boundUser.userId,
        scheduleService,
        catalogItem: morningItem,
        reason: '用户取消早安',
      });
      return formatPushSubscriptionCancelledReply({ catalogItem: morningItem });
    } catch (err) {
      logger.warn?.('[push-subscription] llm cancel failed:', err instanceof Error ? err.message : err);
      return `取消失败：${err instanceof Error ? err.message : String(err)}`;
    }
  }

  if (llmIntent?.action === 'modify') {
    try {
      await updatePushSubscriptionTime({
        userId: boundUser.userId,
        scheduleService,
        catalogItem: morningItem,
        hour: llmIntent.hour,
        minute: llmIntent.minute,
        timezone,
      });
      return formatPushSubscriptionUpdatedReply({
        catalogItem: morningItem,
        hour: llmIntent.hour,
        minute: llmIntent.minute,
      });
    } catch (err) {
      logger.warn?.('[push-subscription] llm update failed:', err instanceof Error ? err.message : err);
      return `修改失败：${err instanceof Error ? err.message : String(err)}`;
    }
  }

  if (llmIntent?.action === 'clarify' && llmIntent.message) {
    return llmIntent.message;
  }

  return null;
}

export function buildPushSubscriptionHelpText() {
  return buildPushSubscriptionMenuLines().join('\n');
}

/**
 * 微信服务号数字订阅消息处理。
 * @returns {Promise<string|null>}
 */
export async function handlePushSubscriptionMessages({
  appId,
  openid,
  text,
  pendingStore,
  scheduleService,
  boundUser = null,
  timezone = 'Asia/Shanghai',
  bindUrl = '',
  sourceMessageId = null,
  wechatSubscribeMorningLlmConfigService = null,
  llmProviderService = null,
  mysqlPool = null,
  h5Root = '',
  env = process.env,
  logger = console,
} = {}) {
  if (parsePushSubscriptionHelpRequest(text)) {
    return buildPushSubscriptionHelpText();
  }

  const secretCode = parsePushSubscriptionSecretCode(text);
  if (secretCode?.kind === 'morning_subscribe') {
    const morningItem = getPushSubscriptionByKey('morning');
    if (morningItem) {
      return tryCommitSubscription({
        userId: boundUser?.userId,
        scheduleService,
        catalogItem: morningItem,
        hour: morningItem.defaultHour,
        minute: morningItem.defaultMinute,
        timezone,
        bindUrl,
        boundUser,
        sourceMessageId,
        sourceText: String(text ?? ''),
        logger,
      });
    }
  }
  if (secretCode?.kind === 'news_immediate') {
    if (isSuspendedBillingUser(boundUser)) {
      return '账户已欠费停用，暂不提供复杂页面推送。请先充值后再试。';
    }
    const delivery = await formatNewsMorningPushDelivery({
      timezone,
      h5Root: String(h5Root ?? '').trim() || process.cwd(),
      pool: mysqlPool,
      env,
    });
    return delivery.text;
  }

  if (parsePushSubscriptionListRequest(text)) {
    if (!boundUser?.userId || !scheduleService) {
      return '绑定账号后可查看订阅状态。';
    }
    const subscriptions = await listActivePushSubscriptions({
      userId: boundUser.userId,
      scheduleService,
    });
    return formatPushSubscriptionListReply({ subscriptions });
  }

  const cityUpdate = parsePushSubscriptionCityUpdate(text);
  if (cityUpdate && boundUser?.userId && scheduleService) {
    try {
      await updatePushSubscriptionOptions({
        userId: boundUser.userId,
        scheduleService,
        catalogItem: cityUpdate.item,
        options: cityUpdate.options,
        timezone,
      });
      return formatPushSubscriptionCityUpdatedReply({
        catalogItem: cityUpdate.item,
        options: cityUpdate.options,
      });
    } catch (err) {
      if (String(err?.message ?? err).includes('订阅不存在')) {
        return `你尚未开通 ${cityUpdate.item.emoji} ${cityUpdate.item.label}，可先回复 ${cityUpdate.item.id} 开通。`;
      }
      return `城市更新失败：${err instanceof Error ? err.message : String(err)}`;
    }
  }

  const cancelRequest = parsePushSubscriptionCancelRequest(text);
  if (cancelRequest && boundUser?.userId && scheduleService) {
    if (cancelRequest.all) {
      const cancelled = await cancelAllPushSubscriptions({
        userId: boundUser.userId,
        scheduleService,
      }).catch((err) => {
        logger.warn?.('[push-subscription] cancel all failed:', err instanceof Error ? err.message : err);
        return null;
      });
      if (cancelled) {
        return formatPushSubscriptionCancelledAllReply({ count: cancelled.length });
      }
      return '取消订阅失败，请稍后再试。';
    }
    if (cancelRequest.item) {
      try {
        await cancelPushSubscription({
          userId: boundUser.userId,
          scheduleService,
          catalogItem: cancelRequest.item,
        });
        return formatPushSubscriptionCancelledReply({ catalogItem: cancelRequest.item });
      } catch (err) {
        if (String(err?.message ?? err).includes('订阅不存在')) {
          return `你尚未开通 ${cancelRequest.item.emoji} ${cancelRequest.item.label}。`;
        }
        return `取消失败：${err instanceof Error ? err.message : String(err)}`;
      }
    }
  }

  const modifyRequest = parsePushSubscriptionModifyRequest(text);
  if (modifyRequest && boundUser?.userId && scheduleService) {
    try {
      await updatePushSubscriptionTime({
        userId: boundUser.userId,
        scheduleService,
        catalogItem: modifyRequest.item,
        hour: modifyRequest.hour,
        minute: modifyRequest.minute,
        timezone,
      });
      return formatPushSubscriptionUpdatedReply({
        catalogItem: modifyRequest.item,
        hour: modifyRequest.hour,
        minute: modifyRequest.minute,
      });
    } catch (err) {
      if (String(err?.message ?? err).includes('订阅不存在')) {
        return `你尚未开通 ${modifyRequest.item.emoji} ${modifyRequest.item.label}，可先回复 ${modifyRequest.item.id} 开通。`;
      }
      return `修改失败：${err instanceof Error ? err.message : String(err)}`;
    }
  }

  if (boundUser?.userId && scheduleService) {
    const morningItem = getPushSubscriptionByKey('morning');
    const compact = String(text ?? '').replace(/\s+/g, '');
    if (morningItem && /^(早安几点|早安时间|早安提醒几点)$/u.test(compact)) {
      const active = await findActivePushSubscription({
        userId: boundUser.userId,
        scheduleService,
        catalogItem: morningItem,
      });
      if (active) {
        return formatPushSubscriptionModifyHelpReply({
          catalogItem: morningItem,
          hour: active.hour,
          minute: active.minute,
        });
      }
    }

    const llmManageReply = await handleMorningLlmManageTurn({
      text,
      boundUser,
      scheduleService,
      timezone,
      defaultHour: morningItem?.defaultHour ?? 8,
      defaultMinute: morningItem?.defaultMinute ?? 0,
      wechatSubscribeMorningLlmConfigService,
      llmProviderService,
      logger,
    });
    if (llmManageReply) return llmManageReply;
  }

  const confirmRequest = parsePushSubscriptionConfirmReply(text);
  if (confirmRequest) {
    const { hour, minute } = resolvePushSubscriptionConfirmTime(confirmRequest.item, {
      hour: confirmRequest.hour,
      minute: confirmRequest.minute,
    });
    let options = confirmRequest.options ?? null;
    if (confirmRequest.item.key === 'weather') {
      options = {
        city: normalizePushWeatherCity(options?.city ?? '北京'),
      };
    }

    if (pendingStore) {
      const pending = await pendingStore.getPending({ appId, openid });
      if (pending) {
        await pendingStore.clearPending({ appId, openid });
      }
    }

    return tryCommitSubscription({
      userId: boundUser?.userId,
      scheduleService,
      catalogItem: confirmRequest.item,
      hour,
      minute,
      timezone,
      bindUrl,
      boundUser,
      sourceMessageId,
      sourceText: String(text ?? ''),
      options,
      logger,
    });
  }

  if (pendingStore) {
    const pending = await pendingStore.getPending({ appId, openid });
    if (pending) {
      const llmPendingReply = await handleMorningLlmPendingTurn({
        text,
        boundUser,
        scheduleService,
        timezone,
        defaultHour: 8,
        defaultMinute: 0,
        bindUrl,
        sourceMessageId,
        wechatSubscribeMorningLlmConfigService,
        llmProviderService,
        logger,
      });
      if (llmPendingReply) {
        await pendingStore.clearPending({ appId, openid });
        return llmPendingReply;
      }

      const compact = String(text ?? '').replace(/\s+/g, '').trim();
      if (compact) {
        await pendingStore.clearPending({ appId, openid });
      }
    }
  }

  return null;
}