import { afterEach, describe, expect, test } from 'bun:test';
import { existsSync, mkdtempSync, readFileSync, rmSync } from 'node:fs';
import { tmpdir } from 'node:os';
import { join } from 'node:path';
import { runTakes } from '../src/commands/takes.ts';
import type { BrainEngine, TakeBatchInput } from '../src/core/engine.ts';
import { withEnv } from './helpers/with-env.ts';

const tmpRoots: string[] = [];

afterEach(() => {
  for (const root of tmpRoots.splice(0)) {
    rmSync(root, { recursive: true, force: true });
  }
});

function makeEngine(opts: { knownSources?: string[] } = {}) {
  const added: TakeBatchInput[][] = [];
  const pageLookups: unknown[][] = [];
  const engine = {
    getConfig: async () => null,
    executeRaw: async (sql: string, params: unknown[] = []) => {
      if (sql.includes('FROM sources WHERE id = $1')) {
        // Default (no `knownSources` override): every id "exists", matching
        // the original test's assumption. When `knownSources` is passed,
        // only ids in that list resolve — used to simulate a source that
        // was explicitly requested (via GBRAIN_SOURCE) but isn't registered.
        if (!opts.knownSources) return [{ id: params[0] as string }];
        return opts.knownSources.includes(params[0] as string) ? [{ id: params[0] as string }] : [];
      }
      if (sql.includes('FROM sources WHERE local_path IS NOT NULL AND id != ')) {
        // resolveSourceId tier 5.5 (sole-non-default-source). No registered
        // sources with a local_path in these tests.
        return [];
      }
      if (sql.includes('FROM sources WHERE local_path IS NOT NULL')) {
        // resolveSourceId tier 4 (registered source whose local_path
        // contains CWD). No registered sources in these tests.
        return [];
      }
      if (sql.includes('FROM pages WHERE slug = $1 AND source_id = $2')) {
        pageLookups.push(params);
        if (params[0] === 'shared/page' && params[1] === 'dept') return [{ id: 22 }];
        if (params[0] === 'shared/page' && params[1] === 'default') return [{ id: 11 }];
        return [];
      }
      if (sql.includes('FROM pages WHERE slug = $1 LIMIT 1')) {
        pageLookups.push(params);
        return [{ id: 11 }];
      }
      return [];
    },
    addTakesBatch: async (rows: TakeBatchInput[]) => {
      added.push(rows);
      return rows.length;
    },
  } as unknown as BrainEngine;
  return { engine, added, pageLookups };
}

describe('gbrain takes CLI source scoping', () => {
  test('add mirrors to the page in GBRAIN_SOURCE, not an arbitrary same-slug page (#2684)', async () => {
    const brainDir = mkdtempSync(join(tmpdir(), 'gbrain-takes-source-'));
    const home = mkdtempSync(join(tmpdir(), 'gbrain-takes-home-'));
    tmpRoots.push(brainDir, home);
    const { engine, added, pageLookups } = makeEngine();

    await withEnv({ GBRAIN_SOURCE: 'dept', GBRAIN_HOME: home }, async () => {
      await runTakes(engine, [
        'add',
        'shared/page',
        '--claim',
        'Dept-scoped claim',
        '--kind',
        'take',
        '--who',
        'self',
        '--dir',
        brainDir,
      ]);
    });

    expect(pageLookups).toEqual([['shared/page', 'dept']]);
    expect(added).toHaveLength(1);
    expect(added[0]![0]!.page_id).toBe(22);

    const written = join(brainDir, 'shared/page.md');
    expect(existsSync(written)).toBe(true);
    expect(readFileSync(written, 'utf-8')).toContain('Dept-scoped claim');
  });

  test('add with no source configuration at all still resolves cleanly (no regression)', async () => {
    const brainDir = mkdtempSync(join(tmpdir(), 'gbrain-takes-source-'));
    const home = mkdtempSync(join(tmpdir(), 'gbrain-takes-home-'));
    tmpRoots.push(brainDir, home);
    const { engine, added, pageLookups } = makeEngine();

    // No GBRAIN_SOURCE, no dotfile, no registered local_path match, no
    // sources.default config, no sole non-default source — resolveSourceId
    // falls through every tier to the seeded 'default' source (tier 6) and
    // never throws. `resolveTakesSourceId` must resolve, not error.
    await withEnv({ GBRAIN_SOURCE: undefined, GBRAIN_HOME: home }, async () => {
      await runTakes(engine, [
        'add',
        'shared/page',
        '--claim',
        'Unscoped-default claim',
        '--kind',
        'take',
        '--who',
        'self',
        '--dir',
        brainDir,
      ]);
    });

    expect(pageLookups).toEqual([['shared/page', 'default']]);
    expect(added).toHaveLength(1);
    expect(added[0]![0]!.page_id).toBe(11);
  });

  test('add fails closed (blocks the write) when GBRAIN_SOURCE names a source that does not resolve (#2684 residual)', async () => {
    const brainDir = mkdtempSync(join(tmpdir(), 'gbrain-takes-source-'));
    const home = mkdtempSync(join(tmpdir(), 'gbrain-takes-home-'));
    tmpRoots.push(brainDir, home);
    // 'ghost' is a well-formed source id (passes SOURCE_ID_RE) but is not a
    // registered source — resolveSourceId's assertSourceExists throws.
    const { engine, added, pageLookups } = makeEngine({ knownSources: ['dept', 'default'] });

    await withEnv({ GBRAIN_SOURCE: 'ghost', GBRAIN_HOME: home }, async () => {
      await expect(
        runTakes(engine, [
          'add',
          'shared/page',
          '--claim',
          'Should never land',
          '--kind',
          'take',
          '--who',
          'self',
          '--dir',
          brainDir,
        ]),
      ).rejects.toThrow(/Source "ghost" not found/);
    });

    // Fail-closed: the write must be blocked entirely, not silently
    // downgraded to an unscoped cross-source lookup.
    expect(pageLookups).toHaveLength(0);
    expect(added).toHaveLength(0);
    expect(existsSync(join(brainDir, 'shared/page.md'))).toBe(false);
  });
});