import {
  aggregateMemoryV2ProductMetrics,
  ensureMemoryV2ProductEventsSchema,
} from './memory-v2-product-events.mjs';
import { runCandidateAutoReviewBatch } from './memory-v2-candidate-auto-review.mjs';
import {
  createPersonalMemoryCandidateStore,
  ensurePersonalMemoryCandidateSchema,
} from './memory-v2-personal-store.mjs';
import { auditMemoryV2Shadow, parseSinceArg } from './memory-v2-shadow-audit.mjs';

async function tableExists(pool, tableName) {
  const [rows] = await pool.query(
    `SELECT 1 AS ok FROM information_schema.tables
     WHERE table_schema = DATABASE() AND table_name = ?
     LIMIT 1`,
    [String(tableName)],
  );
  return rows.length > 0;
}

export function createMemoryV2AdminOpsService(pool, { now = () => Date.now() } = {}) {
  if (!pool?.query) return null;
  let schemaReady = false;

  async function ensureSchema() {
    if (schemaReady) return;
    await ensureMemoryV2ProductEventsSchema(pool);
    await ensurePersonalMemoryCandidateSchema(pool);
    schemaReady = true;
  }

  return {
    async getProductMetrics({ since = '7d', userId = null } = {}) {
      await ensureSchema();
      return aggregateMemoryV2ProductMetrics(pool, { since, userId, now: now() });
    },

    async getShadowAudit({ since = '7d', userId = null } = {}) {
      await ensureSchema();
      const window = parseSinceArg(since, now());
      const params = [window.sinceMs];
      let candidateSql = `SELECT * FROM h5_memory_v2_candidates WHERE created_at >= ?`;
      if (userId) {
        candidateSql += ' AND user_id = ?';
        params.push(String(userId));
      }
      candidateSql += ' ORDER BY created_at DESC LIMIT 5000';
      const [candidates] = await pool.query(candidateSql, params);

      const itemParams = [window.sinceMs];
      let itemSql = `SELECT * FROM h5_user_memory_items WHERE updated_at >= ?`;
      if (userId) {
        itemSql += ' AND user_id = ?';
        itemParams.push(String(userId));
      }
      itemSql += ' ORDER BY updated_at DESC LIMIT 5000';
      const [memoryItems] = (await tableExists(pool, 'h5_user_memory_items'))
        ? await pool.query(itemSql, itemParams)
        : [[]];

      const eventParams = [window.sinceMs];
      let eventSql = `SELECT e.event_type, e.data_json, e.created_at
                      FROM h5_agent_run_events e
                      WHERE e.event_type = 'agent_memory_resolved' AND e.created_at >= ?`;
      if (userId) {
        eventSql = `SELECT e.event_type, e.data_json, e.created_at
                    FROM h5_agent_run_events e
                    INNER JOIN h5_agent_runs r ON r.id = e.run_id
                    WHERE e.event_type = 'agent_memory_resolved'
                      AND e.created_at >= ?
                      AND r.user_id = ?`;
        eventParams.push(String(userId));
      }
      eventSql += ' ORDER BY e.created_at DESC LIMIT 5000';
      const [agentMemoryEvents] = (await tableExists(pool, 'h5_agent_run_events'))
        ? await pool.query(eventSql, eventParams)
        : [[]];

      return auditMemoryV2Shadow({
        candidates,
        memoryItems,
        pgvectorMemoryIds: new Set(memoryItems.map((row) => String(row.id))),
        pgvectorConfigured: false,
        agentMemoryEvents,
        sinceMs: window.sinceMs,
        nowMs: now(),
      });
    },

    async listCandidates({ status = 'candidate', userId = null, limit = 50, offset = 0 } = {}) {
      await ensureSchema();
      const store = createPersonalMemoryCandidateStore(pool, { now });
      return store.listCandidates({ status, userId, limit, offset });
    },

    async countCandidatesByStatus() {
      await ensureSchema();
      const store = createPersonalMemoryCandidateStore(pool, { now });
      return store.countByStatus();
    },

    async reviewCandidate(id, status, { reviewedBy = null } = {}) {
      await ensureSchema();
      const store = createPersonalMemoryCandidateStore(pool, { now });
      return store.reviewCandidate(id, status, { reviewedBy });
    },

    async runAutoReview({ userId = null, limit = 200 } = {}) {
      await ensureSchema();
      return runCandidateAutoReviewBatch(pool, {
        userId,
        limit,
        reviewedBy: 'system:admin-auto-review',
        now: now(),
      });
    },
  };
}