import { createUserDataSpaceService } from './user-data-space-service.mjs';
import { ensureHealthPageDataForUser } from './health-page-data-bootstrap.mjs';
import { HEALTH_EVENTS_DATASET } from './health-page-data-schema.mjs';
import {
  healthEventFingerprint,
  mapHealthEventToPgPayload,
  mapPgHealthEventRow,
} from './health-event-serialize.mjs';

const DATASET_NAME = HEALTH_EVENTS_DATASET.name;

export function createPageDataHealthEventStore({
  resolveWorkspaceRoot,
  logger = console,
} = {}) {
  if (typeof resolveWorkspaceRoot !== 'function') {
    throw new Error('createPageDataHealthEventStore requires resolveWorkspaceRoot');
  }

  async function getUserDataSpace(userId) {
    const workspaceRoot = await resolveWorkspaceRoot(userId);
    if (!workspaceRoot) return null;
    const service = createUserDataSpaceService({ workspaceRoot, userId: String(userId) });
    await ensureHealthPageDataForUser(service, userId);
    return service;
  }

  async function list(userId, { status = 'open', limit = 100 } = {}) {
    const service = await getUserDataSpace(userId);
    if (!service) return [];
    try {
      const result = await service.readDatasetRows(DATASET_NAME, {
        limit: Math.min(Math.max(limit, 1), 200),
        orderBy: 'detected_at',
        orderDir: 'desc',
      });
      return (result.rows ?? [])
        .map((row) => mapPgHealthEventRow(row, userId))
        .filter((row) => !status || row.status === status);
    } catch (error) {
      if (error?.code === 'dataset_not_found') return [];
      throw error;
    }
  }

  return {
    backend: 'page_data',
    list,
    async listUnreadAlerts(userId, { limit = 20 } = {}) {
      const rows = await list(userId, { status: 'open', limit: 200 });
      return rows
        .filter((row) => row.severity === 'watch' || row.severity === 'alert')
        .slice(0, limit);
    },
    async acknowledge(userId, eventId) {
      const openRows = await list(userId, { status: 'open', limit: 200 });
      const existing = openRows.find((row) => Number(row.id) === Number(eventId));
      if (!existing?.id) return null;
      const service = await getUserDataSpace(userId);
      if (!service) return null;
      const { row } = await service.updateDatasetRow(DATASET_NAME, existing.id, { status: 'acknowledged' });
      return mapPgHealthEventRow(row, userId);
    },
    async acknowledgeAll(userId) {
      const openRows = await listUnreadAlerts(userId, { limit: 200 });
      let count = 0;
      for (const row of openRows) {
        const updated = await this.acknowledge(userId, row.id);
        if (updated) count += 1;
      }
      return count;
    },
    async insertIfNew(userId, event, { now = Date.now() } = {}) {
      const openRows = await list(userId, { status: 'open', limit: 200 });
      const fingerprint = healthEventFingerprint(event);
      const duplicate = openRows.find((row) => healthEventFingerprint(row) === fingerprint);
      if (duplicate) return { row: duplicate, created: false };

      const service = await getUserDataSpace(userId);
      if (!service) {
        const error = Object.assign(new Error('用户健康事件空间不可用'), { code: 'health_storage_unavailable' });
        throw error;
      }
      try {
        const { row } = await service.insertDatasetRow(
          DATASET_NAME,
          mapHealthEventToPgPayload(event, now),
        );
        return { row: mapPgHealthEventRow(row, userId), created: true };
      } catch (error) {
        logger.warn?.('Page Data health event insert failed:', error);
        throw error;
      }
    },
  };
}