import { afterEach, beforeEach, describe, expect, it } from 'vitest';

import { IdentityDB } from '../src/core/identity-db';

describe('IdentityDB topic and fact writes', () => {
  let db: IdentityDB;

  beforeEach(async () => {
    db = await IdentityDB.connect({ client: 'sqlite', filename: ':memory:' });
    await db.initialize();
  });

  afterEach(async () => {
    await db.close();
  });

  it('deduplicates topics by normalized name during upsert', async () => {
    const first = await db.upsertTopic({
      name: 'TypeScript',
      category: 'entity',
      granularity: 'concrete',
    });

    const second = await db.upsertTopic({
      name: '  typescript  ',
      category: 'entity',
      granularity: 'concrete',
    });

    expect(second.id).toBe(first.id);
    expect(second.normalizedName).toBe('typescript');

    const topics = await db.listTopics({ includeFacts: false });
    expect(topics).toHaveLength(1);
  });

  it('keeps same normalized topic names isolated across spaces', async () => {
    const alpha = await db.upsertTopic({
      name: 'TypeScript',
      category: 'entity',
      granularity: 'concrete',
      spaceName: 'A',
    });

    const beta = await db.upsertTopic({
      name: 'TypeScript',
      category: 'entity',
      granularity: 'concrete',
      spaceName: 'B',
    });

    expect(beta.id).not.toBe(alpha.id);

    const alphaTopics = await db.listTopics({ includeFacts: false, spaceName: 'A' });
    const betaTopics = await db.listTopics({ includeFacts: false, spaceName: 'B' });
    const defaultTopics = await db.listTopics({ includeFacts: false });

    expect(alphaTopics.map((topic) => topic.name)).toEqual(['TypeScript']);
    expect(betaTopics.map((topic) => topic.name)).toEqual(['TypeScript']);
    expect(defaultTopics).toHaveLength(0);
  });

  it('keeps alias resolution scoped to the requested space', async () => {
    await db.upsertTopic({
      name: 'TypeScript',
      category: 'entity',
      granularity: 'concrete',
      spaceName: 'A',
    });
    await db.upsertTopic({
      name: 'TeamSpeak',
      category: 'entity',
      granularity: 'concrete',
      spaceName: 'B',
    });

    await db.addTopicAlias('TypeScript', 'TS', { spaceName: 'A' });
    await db.addTopicAlias('TeamSpeak', 'TS', { spaceName: 'B' });

    const alphaResolved = await db.resolveTopic('ts', { spaceName: 'A' });
    const betaResolved = await db.resolveTopic('ts', { spaceName: 'B' });
    const defaultResolved = await db.resolveTopic('ts');

    expect(alphaResolved?.name).toBe('TypeScript');
    expect(betaResolved?.name).toBe('TeamSpeak');
    expect(defaultResolved).toBeNull();
  });

  it('adds one fact that links multiple topics', async () => {
    const fact = await db.addFact({
      statement: 'I have worked with TypeScript since 2025.',
      topics: [
        { name: 'I', category: 'entity', granularity: 'concrete', role: 'subject' },
        { name: 'TypeScript', category: 'entity', granularity: 'concrete', role: 'object' },
        { name: '2025', category: 'temporal', granularity: 'concrete', role: 'time' },
      ],
    });

    expect(fact.statement).toBe('I have worked with TypeScript since 2025.');
    expect(fact.topics.map((topic) => topic.name)).toEqual(['I', 'TypeScript', '2025']);

    const typeScriptFacts = await db.getTopicFacts('TypeScript');
    expect(typeScriptFacts).toHaveLength(1);
    expect(typeScriptFacts[0]?.statement).toBe('I have worked with TypeScript since 2025.');
  });

  it('resolves alias names to a canonical topic', async () => {
    await db.upsertTopic({
      name: 'TypeScript',
      category: 'entity',
      granularity: 'concrete',
    });

    await db.addTopicAlias('TypeScript', 'TS');

    const resolved = await db.resolveTopic('ts');
    const aliases = await db.getTopicAliases('TypeScript');

    expect(resolved?.name).toBe('TypeScript');
    expect(aliases).toEqual(['TS']);
  });

  it('reuses the canonical topic when a fact is added through an alias', async () => {
    await db.upsertTopic({
      name: 'TypeScript',
      category: 'entity',
      granularity: 'concrete',
    });

    await db.addTopicAlias('TypeScript', 'TS');

    await db.addFact({
      statement: 'TS compiles to JavaScript.',
      topics: [{ name: 'TS', category: 'entity', granularity: 'concrete' }],
    });

    const topics = await db.listTopics({ includeFacts: false });
    const facts = await db.getTopicFacts('TypeScript');

    expect(topics.map((topic) => topic.name)).toEqual(['TypeScript']);
    expect(facts.map((fact) => fact.statement)).toEqual(['TS compiles to JavaScript.']);
  });
});