import { isUnifiedTasksEnabled } from './task-unified-config.mjs';
import { mapLegacyTodoItemRow } from './task-unified-service.mjs';

function syncOpen(taskUnifiedService, fn) {
  return fn().catch((err) => {
    console.warn?.(
      '[task-unified-sync] failed open:',
      err instanceof Error ? err.message : err,
    );
  });
}

export function attachUnifiedTaskSync({
  scheduleService,
  scheduledTaskService,
  taskUnifiedService,
  pool,
  env = process.env,
  logger = console,
}) {
  if (!isUnifiedTasksEnabled(env) || !taskUnifiedService || !pool) {
    return { scheduleService, scheduledTaskService };
  }

  const warn = (...args) => logger.warn?.(...args);

  if (scheduleService?.createItem) {
    const original = scheduleService.createItem.bind(scheduleService);
    scheduleService.createItem = async (payload) => {
      const item = await original(payload);
      if (item?.kind === 'task') {
        await syncOpen(taskUnifiedService, () =>
          taskUnifiedService.syncFromLegacyMapped(mapLegacyTodoItemRow({
            id: item.id,
            user_id: item.userId,
            title: item.title,
            timezone: item.timezone,
            status: item.status,
            source_channel: payload.sourceChannel ?? null,
            source_message_id: payload.sourceMessageId ?? null,
            source_text: payload.sourceText ?? null,
          })));
      }
      return item;
    };
  }

  if (scheduleService?.createReminder) {
    const original = scheduleService.createReminder.bind(scheduleService);
    scheduleService.createReminder = async (payload) => {
      const reminder = await original(payload);
      try {
        const [rows] = await pool.query(
          `SELECT i.*, r.id AS reminder_id, r.remind_at, r.channel, r.status AS reminder_status
           FROM h5_schedule_items i
           JOIN h5_schedule_reminders r ON r.item_id = i.id
           WHERE r.id = ?
           LIMIT 1`,
          [reminder.id],
        );
        const row = rows?.[0];
        if (row) {
          await taskUnifiedService.syncFromCommit({
            userId: payload.userId,
            kind: 'timed_reminder',
            committed: {
              item: {
                id: row.id,
                title: row.title,
                startAt: row.start_at ?? reminder.remindAt,
                timezone: row.timezone,
                sourceChannel: row.source_channel,
                sourceMessageId: row.source_message_id,
                sourceText: row.source_text,
              },
              reminder,
            },
          });
        }
      } catch (err) {
        warn('[task-unified-sync] reminder sync failed:', err instanceof Error ? err.message : err);
      }
      return reminder;
    };
  }

  if (scheduleService?.createDailyTodoDigest) {
    const original = scheduleService.createDailyTodoDigest.bind(scheduleService);
    scheduleService.createDailyTodoDigest = async (payload) => {
      const subscription = await original(payload);
      await syncOpen(taskUnifiedService, () =>
        taskUnifiedService.syncFromCommit({
          userId: payload.userId,
          kind: 'create_daily_todo_digest',
          committed: { subscription },
        }));
      return subscription;
    };
  }

  if (scheduleService?.createBalanceLowAlert) {
    const original = scheduleService.createBalanceLowAlert.bind(scheduleService);
    scheduleService.createBalanceLowAlert = async (payload) => {
      const subscription = await original(payload);
      await syncOpen(taskUnifiedService, () =>
        taskUnifiedService.syncFromCommit({
          userId: payload.userId,
          kind: 'create_balance_alert',
          committed: { subscription },
        }));
      return subscription;
    };
  }

  if (scheduledTaskService?.createTask) {
    const original = scheduledTaskService.createTask.bind(scheduledTaskService);
    scheduledTaskService.createTask = async (payload) => {
      const task = await original(payload);
      await syncOpen(taskUnifiedService, () =>
        taskUnifiedService.syncFromCommit({
          userId: payload.userId,
          kind: 'scheduled_task',
          committed: { task },
        }));
      return task;
    };
  }

  if (scheduledTaskService?.cancelTask) {
    const original = scheduledTaskService.cancelTask.bind(scheduledTaskService);
    scheduledTaskService.cancelTask = async (payload) => {
      const task = await original(payload);
      if (task?.id && payload?.userId) {
        await syncOpen(taskUnifiedService, () =>
          taskUnifiedService.markLegacyCancelled({
            userId: payload.userId,
            legacyRef: { table: 'h5_scheduled_tasks', id: task.id },
          }));
      }
      return task;
    };
  }

  const automationLegacyRef = (task) => ({
    table: 'h5_scheduled_tasks',
    id: task.id,
  });

  if (scheduledTaskService?.markTaskSucceeded) {
    const original = scheduledTaskService.markTaskSucceeded.bind(scheduledTaskService);
    scheduledTaskService.markTaskSucceeded = async (task, options) => {
      const updated = await original(task, options);
      await syncOpen(taskUnifiedService, () =>
        taskUnifiedService.syncLegacyLifecycle({
          userId: updated.userId,
          legacyRef: automationLegacyRef(updated),
          status: updated.status === 'completed' ? 'completed' : 'active',
          nextRunAt: updated.nextRunAt ?? null,
          lastRunAt: updated.lastRunAt ?? null,
          lastError: null,
        }));
      return updated;
    };
  }

  if (scheduledTaskService?.markTaskFailed) {
    const original = scheduledTaskService.markTaskFailed.bind(scheduledTaskService);
    scheduledTaskService.markTaskFailed = async (task, error, options) => {
      const updated = await original(task, error, options);
      await syncOpen(taskUnifiedService, () =>
        taskUnifiedService.syncLegacyLifecycle({
          userId: updated.userId,
          legacyRef: automationLegacyRef(updated),
          status: updated.status === 'failed' ? 'failed' : 'active',
          nextRunAt: updated.nextRunAt ?? null,
          lastError: updated.lastError ?? null,
        }));
      return updated;
    };
  }

  return { scheduleService, scheduledTaskService };
}