import { classifyUserIntent, inferActionLevel } from '../../intent-classifier.mjs';
import { commitIntentDraft } from '../../intent-transaction-commit.mjs';
import {
  formatDraftCancelledReply,
  formatDraftCommittedReply,
  formatIntentActionCard,
  parseDraftUserReply,
} from '../../intent-action-card.mjs';
import { formatQueryGuardReply } from '../../intent-query-guard.mjs';
import { isIntentTransactionEnabled } from '../../intent-transaction-config.mjs';
import { buildScheduledTaskCreatePayload } from '../../scheduled-task-intent.mjs';
import { formatScheduledTaskCreateReply } from '../../scheduled-task-intent.mjs';
import { isScheduledTaskWorkerEnabled, scheduledTaskWorkerDisabledMessage } from '../../scheduled-task-worker-config.mjs';

function buildDraftPayload(classification, { intent, user, timezone }) {
  const { kind, detail } = classification;
  const base = {
    sourceChannel: 'wechat',
    sourceMessageId: intent.msgId ?? null,
    sourceText: intent.agentText,
    timezone,
  };

  if (kind === 'timed_reminder') {
    return {
      ...base,
      title: detail.title,
      remindLocal: detail.remindLocal,
      hour: detail.hour,
      minute: detail.minute,
      recurrence: detail.recurrence ?? 'once',
    };
  }
  if (kind === 'create_todo') {
    return { ...base, title: detail.title };
  }
  if (kind === 'create_daily_todo_digest') {
    return { ...base, hour: detail.hour, minute: detail.minute ?? 0 };
  }
  if (kind === 'create_balance_alert') {
    return { ...base, thresholdCents: detail.thresholdCents };
  }
  if (kind === 'scheduled_task') {
    return {
      ...base,
      intentDetail: detail,
      createPayload: buildScheduledTaskCreatePayload(detail, {
        userId: user.userId,
        sourceChannel: 'wechat',
        sourceMessageId: intent.msgId ?? null,
        sourceText: intent.agentText,
        timezone,
      }),
    };
  }
  return base;
}

function buildCard(classification, draftPayload, actionLevel, text) {
  const { layer, kind, detail, clarify } = classification;
  if (kind === 'clarify' || classification.layer === 'ambiguous') {
    return formatIntentActionCard({ clarify: ['notify_vs_act'] });
  }
  if (clarify?.length) {
    return formatIntentActionCard({ clarify });
  }

  const title = detail?.title ?? detail?.taskSpec?.slice?.(0, 80) ?? draftPayload.title ?? '待确认任务';
  const trigger = detail?.remindLocal
    ? { at: detail.remindLocal }
    : { hour: detail?.hour, minute: detail?.minute ?? 0 };
  const frequency = /(?:每天|每日)/u.test(text)
    ? '每天自动执行'
    : detail?.recurrence === 'weekly'
      ? '每周自动执行'
      : detail?.recurrence === 'daily'
        ? '每天自动执行'
        : null;

  const actions = kind === 'scheduled_task'
    ? ['到点自动执行任务', '推送执行结果到微信']
    : kind === 'timed_reminder'
      ? ['到点发送微信提醒']
      : kind === 'create_daily_todo_digest'
        ? ['到点推送当天待办摘要']
        : kind === 'create_balance_alert'
          ? ['余额低于阈值时发送微信提醒']
          : ['记录到待办列表'];

  return formatIntentActionCard({
    title,
    layer,
    actionLevel,
    trigger,
    actions,
    frequency,
  });
}

export async function handleWechatIntentTransaction({
  intent,
  user,
  intentDraftService,
  taskUnifiedService = null,
  scheduleService,
  scheduledTaskService,
  env = process.env,
  logger = console,
}) {
  if (!isIntentTransactionEnabled(env) || !intentDraftService) return null;
  const timezone = env.H5_DEFAULT_TIMEZONE || 'Asia/Shanghai';
  const text = intent.agentText;

  try {
    const pending = await intentDraftService.getPendingDraft(user.userId);
    const replyKind = parseDraftUserReply(text);
    if (pending && replyKind) {
      if (replyKind === 'cancel') {
        await intentDraftService.cancelDraft(pending.id, user.userId);
        return formatDraftCancelledReply();
      }
      if (replyKind === 'modify') {
        await intentDraftService.cancelDraft(pending.id, user.userId, { reason: 'user_modify' });
        return '好的，请重新发送完整的安排，例如「下午 2 点半提醒我开项目计划例会」。';
      }
      if (replyKind === 'confirm') {
        if (pending.layer === 'ambiguous' || pending.draftType === 'clarify') {
          return '我还需要确认：你是要「到点提醒」还是「到点自动执行并交付结果」？请补充后再发「确认」。';
        }
        const committed = await commitIntentDraft({
          draft: pending,
          userId: user.userId,
          scheduleService,
          scheduledTaskService,
          taskUnifiedService,
          timezone,
          env,
        });
        await intentDraftService.markDraftCommitted(pending.id, user.userId, committed);
        if (committed.kind === 'scheduled_task') {
          const workerWarning = isScheduledTaskWorkerEnabled(env)
            ? null
            : scheduledTaskWorkerDisabledMessage(env);
          let reply = formatScheduledTaskCreateReply(committed.task, { workerWarning });
          reply = `${reply}\n\n（已通过确认卡片写入）`;
          return reply;
        }
        return formatDraftCommittedReply({ title: pending.title, kind: pending.draftType });
      }
    }

    const classification = classifyUserIntent(text, { timezone });
    const { layer, kind, action } = classification;

    if (layer === 'L0') {
      return formatQueryGuardReply(text, {
        scheduleService,
        scheduledTaskService,
        taskUnifiedService,
        userId: user.userId,
        timezone,
        env,
      });
    }

    if (layer === 'L3' || layer === null || kind === 'agent_schedule' || kind === 'agent_automation') {
      return null;
    }

    if (kind === 'manage') {
      return null;
    }

    if (layer === 'ambiguous' || kind === 'clarify') {
      if (classification.clarify?.length && kind !== 'clarify') {
        return buildCard(classification, {}, inferActionLevel(classification, text), text);
      }
      await intentDraftService.createDraft({
        userId: user.userId,
        layer: 'ambiguous',
        draftType: 'clarify',
        actionLevel: 2,
        title: '待确认意图',
        payload: { clarify: ['notify_vs_act'], sourceText: text },
        cardText: buildCard({ layer: 'ambiguous', kind: 'clarify', clarify: ['notify_vs_act'] }, {}, 2, text),
        sourceMessageId: intent.msgId ?? null,
        sourceText: text,
      });
      return buildCard({ layer: 'ambiguous', kind: 'clarify', clarify: ['notify_vs_act'] }, {}, 2, text);
    }

    const draftableKinds = new Set([
      'timed_reminder',
      'create_todo',
      'create_daily_todo_digest',
      'create_balance_alert',
      'scheduled_task',
    ]);
    if (!draftableKinds.has(kind)) return null;
    if (classification.clarify?.length) {
      return buildCard(classification, {}, inferActionLevel(classification, text), text);
    }

    const actionLevel = inferActionLevel(classification, text);
    const payload = buildDraftPayload(classification, { intent, user, timezone });
    const cardText = buildCard(classification, payload, actionLevel, text);
    await intentDraftService.createDraft({
      userId: user.userId,
      layer,
      draftType: kind,
      actionLevel,
      title: payload.title ?? payload.createPayload?.title ?? classification.detail?.title ?? '待确认任务',
      payload,
      cardText,
      sourceMessageId: intent.msgId ?? null,
      sourceText: text,
    });
    return cardText;
  } catch (err) {
    logger.warn?.(
      '[wechat-intent-transaction] failed:',
      err instanceof Error ? err.message : err,
    );
    return `设置预览失败：${err instanceof Error ? err.message : String(err)}`;
  }
}