import assert from 'node:assert/strict';
import test from 'node:test';
import { createMemoryV2 } from './memory-v2.mjs';
import {
  createPgvectorMemoryBackend,
  pgvectorMemoryBackendInternals,
} from './memory-v2-pgvector.mjs';

test('pgvector backend is disabled by default and does not query storage', async () => {
  let queried = false;
  const backend = createPgvectorMemoryBackend({
    pool: {
      async query() {
        queried = true;
        return { rows: [] };
      },
    },
  });

  assert.equal(backend.isAvailable(), false);
  assert.deepEqual(await backend.resolve({
    userId: 'user-1',
    embedding: [0.1, 0.2],
  }), {
    memories: [],
    semanticMemories: [],
  });
  assert.equal(queried, false);
});

test('pgvector backend returns empty semantic result when embedding is unavailable', async () => {
  let queried = false;
  const backend = createPgvectorMemoryBackend({
    enabled: true,
    pool: {
      async query() {
        queried = true;
        return { rows: [] };
      },
    },
  });

  const result = await backend.resolve({
    userId: 'user-1',
    query: 'memory-chain',
  });

  assert.deepEqual(result, {
    memories: [],
    semanticMemories: [],
  });
  assert.equal(queried, false);
});

test('pgvector backend performs parameterized vector lookup when explicitly enabled', async () => {
  const queries = [];
  const backend = createPgvectorMemoryBackend({
    enabled: true,
    tableName: 'memory_embeddings',
    pool: {
      async query(sql, params) {
        queries.push({ sql, params });
        return {
          rows: [
            {
              id: 7,
              content: '用户关注 Memory V2 的 facade 边界',
              type: 'fact',
              score: '0.87',
              created_at: '2026-07-02T00:00:00.000Z',
            },
          ],
        };
      },
    },
    embedQuery: async (query) => {
      assert.equal(query, 'memory-chain');
      return [0.25, 0.5, 0.75];
    },
  });

  assert.equal(backend.isAvailable(), true);
  const result = await backend.resolve({
    userId: 'user-1',
    query: 'memory-chain',
    limit: 5,
  });

  assert.equal(queries.length, 1);
  assert.match(queries[0].sql, /FROM memory_embeddings/);
  assert.match(queries[0].sql, /WITH vector_candidates/);
  assert.match(queries[0].sql, /recent_candidates/);
  assert.deepEqual(queries[0].params, ['user-1', '[0.25,0.5,0.75]', 50]);
  assert.deepEqual(result.semanticMemories, ['用户关注 Memory V2 的 facade 边界']);
  assert.deepEqual(result.memories, [
    {
      id: '7',
      label: 'fact',
      text: '用户关注 Memory V2 的 facade 边界',
      score: 0.87,
      createdAt: '2026-07-02T00:00:00.000Z',
      updatedAt: '2026-07-02T00:00:00.000Z',
    },
  ]);
});

test('pgvector hybrid ranking recovers a recent Chinese memory missed by vector top-k', async () => {
  const marker = 'MEM-RECALL-NEW';
  const backend = createPgvectorMemoryBackend({
    enabled: true,
    pool: {
      async query() {
        return {
          rows: [
            {
              id: 1,
              content: '用户以前关注贵州旅游攻略',
              type: 'interest',
              score: 0.91,
              created_at: '2026-06-01T00:00:00.000Z',
              updated_at: '2026-06-01T00:00:00.000Z',
            },
            {
              id: 2,
              content: `用户的记忆召回灰度测试代号是 ${marker}`,
              type: 'fact',
              score: -0.49,
              created_at: '2026-07-22T00:00:00.000Z',
              updated_at: '2026-07-22T00:00:00.000Z',
            },
            {
              id: 3,
              content: '用户偏好简洁回答',
              type: 'preference',
              score: 0.3,
              created_at: '2026-07-21T00:00:00.000Z',
              updated_at: '2026-07-21T00:00:00.000Z',
            },
          ],
        };
      },
    },
    embedQuery: async () => [0.25, 0.5, 0.75],
  });

  const result = await backend.resolve({
    userId: 'user-1',
    query: '我之前让你记住的记忆召回灰度测试代号是什么？请只回答完整代号。',
    limit: 3,
  });

  assert.match(result.memories[0].text, new RegExp(marker));
});

test('pgvector hybrid ranking keeps vector order when query has no lexical overlap', () => {
  const ranked = pgvectorMemoryBackendInternals.rankHybridCandidates([
    { id: 1, content: 'alpha', score: 0.2 },
    { id: 2, content: 'beta', score: 0.8 },
  ], '完全无关的中文查询', 2);
  assert.equal(ranked[0].id, '2');
  assert.equal(ranked[1].id, '1');
});

test('pgvector backend validates table names before building SQL', () => {
  assert.throws(
    () => createPgvectorMemoryBackend({ tableName: 'memory_embeddings;DROP TABLE users' }),
    /Invalid pgvector table name/,
  );
});

test('Memory V2 can expose pgvector as unavailable plugin without selecting it', async () => {
  const memory = createMemoryV2({
    logger: { warn() {} },
    backends: [
      createPgvectorMemoryBackend({ enabled: false }),
      {
        name: 'legacy-conversation-memory',
        async resolve() {
          return { memories: [{ label: 'fact', text: 'legacy survives' }] };
        },
      },
    ],
    env: {
      MEMORY_ENABLED: '1',
      MEMORY_BACKEND: 'pgvector',
      MEMORY_VECTOR_ENABLED: '1',
    },
  });

  const status = memory.getStatus();
  const result = await memory.resolve({ userId: 'user-1', query: 'memory-chain' });

  assert.equal(status.vectorEnabled, true);
  assert.equal(status.selectedBackend, 'legacy-conversation-memory');
  assert.equal(status.backends.find((item) => item.name === 'pgvector')?.available, false);
  assert.deepEqual(result.memories, [{ label: 'fact', text: 'legacy survives' }]);
});