import { describe, it, expect, beforeEach } from 'vitest';
import { mkdtemp } from 'node:fs/promises';
import { tmpdir } from 'node:os';
import { join } from 'node:path';
import { writeCache, type CacheFile } from '../../src/lib/cache.js';
import { parseTargetProject, resolveTarget } from '../../src/lib/resolve-target.js';

describe('parseTargetProject', () => {
  it('accepts the agenda literal', () => {
    const r = parseTargetProject('agenda');
    expect(r).toEqual({ agenda: true });
  });

  it('accepts qualified <owner>/<repo>', () => {
    const r = parseTargetProject('victor/books');
    expect(r).toEqual({ agenda: false, owner: 'victor', repo: 'books' });
  });

  it('rejects bare repo name with hint', () => {
    const r = parseTargetProject('books');
    expect(r).toEqual({ error: expect.stringContaining('must be qualified') });
    const err = (r as { error: string }).error;
    expect(err).toContain('use `<owner>/<repo>`');
    expect(err).toContain('victor/books');
    expect(err).toContain('Got: `books`');
  });

  it('rejects the legacy _meta literal (replaced by `agenda` in 2.0)', () => {
    const r = parseTargetProject('_meta');
    expect(r).toEqual({ error: expect.stringContaining('must be qualified') });
    expect((r as { error: string }).error).toContain('Got: `_meta`');
  });

  it('rejects empty string', () => {
    const r = parseTargetProject('');
    expect('error' in r).toBe(true);
  });

  it('rejects leading slash', () => {
    const r = parseTargetProject('/books');
    expect('error' in r).toBe(true);
  });

  it('rejects trailing slash', () => {
    const r = parseTargetProject('victor/');
    expect('error' in r).toBe(true);
  });

  it('rejects more than one slash', () => {
    const r = parseTargetProject('a/b/c');
    expect('error' in r).toBe(true);
  });

  it('rejects whitespace inside', () => {
    const r = parseTargetProject('victor /books');
    expect('error' in r).toBe(true);
  });

  it('rejects empty owner segment', () => {
    const r = parseTargetProject('//books');
    expect('error' in r).toBe(true);
  });
});

describe('resolveTarget', () => {
  let cacheFile: string;
  const baseFixture: CacheFile = {
    schemaVersion: 3,
    synced_at: '2026-05-08T00:00:00Z',
    synced_from: 'https://g',
    machine: 'm',
    projects: [
      {
        name: 'victor/books',
        default_branch: 'main',
        fetched_at: '2026-05-08T00:00:00Z',
        active_tasks: [],
        all_tasks_count: 0,
        raw: '',
      },
      {
        name: 'OpeItcLoc03/common',
        default_branch: 'master',
        fetched_at: '2026-05-08T00:00:00Z',
        active_tasks: [],
        all_tasks_count: 0,
        raw: '',
      },
    ],
    errors: [],
  };

  beforeEach(async () => {
    const dir = await mkdtemp(join(tmpdir(), 'resolve-target-'));
    cacheFile = join(dir, 'cache.json');
    await writeCache(cacheFile, baseFixture);
  });

  it('returns owner+repo+branch for qualified target in cache', async () => {
    const r = await resolveTarget(cacheFile, 'victor/books', 'agenda', 'OpeItcLoc03');
    expect(r).toEqual({ owner: 'victor', repo: 'books', branch: 'main', isAgenda: false });
  });

  it('routes agenda to fallbackOwner + agendaRepo', async () => {
    await writeCache(cacheFile, {
      ...baseFixture,
      projects: [
        ...baseFixture.projects,
        {
          name: 'agenda',
          default_branch: 'main',
          fetched_at: '2026-05-08T00:00:00Z',
          active_tasks: [],
          all_tasks_count: 0,
          raw: '',
        },
      ],
    });
    const r = await resolveTarget(cacheFile, 'agenda', 'agenda', 'OpeItcLoc03');
    expect(r).toEqual({ owner: 'OpeItcLoc03', repo: 'agenda', branch: 'main', isAgenda: true });
  });

  it('rejects bare name with hint message', async () => {
    const r = await resolveTarget(cacheFile, 'books', 'agenda', 'OpeItcLoc03');
    expect('error' in r).toBe(true);
    expect((r as { error: string }).error).toContain('must be qualified');
  });

  it('errors on cache miss for qualified target', async () => {
    const r = await resolveTarget(cacheFile, 'ghost/repo', 'agenda', 'OpeItcLoc03');
    expect('error' in r).toBe(true);
    expect((r as { error: string }).error).toContain('not in cache');
  });

  it('qualified-unknown owner returns cache-miss error, not shape-error', async () => {
    const r = await resolveTarget(cacheFile, 'ekassir/books', 'agenda', 'OpeItcLoc03');
    expect('error' in r).toBe(true);
    const err = (r as { error: string }).error;
    expect(err).not.toContain('must be qualified');
    expect(err).toContain('not in cache');
    expect(err).toContain('ekassir/books');
  });

  it('errors on missing agenda entry in cache', async () => {
    const r = await resolveTarget(cacheFile, 'agenda', 'agenda', 'OpeItcLoc03');
    expect('error' in r).toBe(true);
    expect((r as { error: string }).error).toContain('agenda not in cache');
  });

  it('errors when agenda is local-only', async () => {
    await writeCache(cacheFile, {
      ...baseFixture,
      projects: [
        ...baseFixture.projects,
        {
          name: 'agenda',
          default_branch: 'local',
          fetched_at: '2026-05-08T00:00:00Z',
          active_tasks: [],
          all_tasks_count: 0,
          raw: '',
        },
      ],
    });
    const r = await resolveTarget(cacheFile, 'agenda', 'agenda', 'OpeItcLoc03');
    expect('error' in r).toBe(true);
    expect((r as { error: string }).error).toContain('Gitea repo "agenda" not found');
  });

  it('errors when cache missing entirely', async () => {
    const r = await resolveTarget('/nonexistent/cache.json', 'victor/books', 'agenda', 'OpeItcLoc03');
    expect('error' in r).toBe(true);
    expect((r as { error: string }).error).toContain('cache missing');
  });

  it('routes agenda to agendaOwner override (qualified agenda_tasks_repo)', async () => {
    await writeCache(cacheFile, {
      ...baseFixture,
      projects: [
        ...baseFixture.projects,
        {
          name: 'agenda',
          default_branch: 'main',
          fetched_at: '2026-05-08T00:00:00Z',
          active_tasks: [],
          all_tasks_count: 0,
          raw: '',
        },
      ],
    });
    const r = await resolveTarget(cacheFile, 'agenda', 'agenda', 'OpeItcLoc03', 'victor');
    expect(r).toEqual({ owner: 'victor', repo: 'agenda', branch: 'main', isAgenda: true });
  });

  it('falls back to fallbackOwner when agendaOwner is undefined (bare agenda_tasks_repo)', async () => {
    await writeCache(cacheFile, {
      ...baseFixture,
      projects: [
        ...baseFixture.projects,
        {
          name: 'agenda',
          default_branch: 'main',
          fetched_at: '2026-05-08T00:00:00Z',
          active_tasks: [],
          all_tasks_count: 0,
          raw: '',
        },
      ],
    });
    const r = await resolveTarget(cacheFile, 'agenda', 'agenda', 'OpeItcLoc03', undefined);
    expect(r).toEqual({ owner: 'OpeItcLoc03', repo: 'agenda', branch: 'main', isAgenda: true });
  });
});