// Règles d'affichage de la vue Changements et de l'index Git. Fonctions pures, testées sans DOM.
import { describe, expect, it } from 'vitest';
import type { RepoSummary, WorktreeGitStatus, WorktreeSummary } from '@arboretum/shared';
import {
  dirtyFileCount,
  groupWorktreesByRepo,
  hasPendingWork,
  pendingWorktreeCount,
  sortForIndex,
} from '../src/lib/changes-model';

const git = (over: Partial<WorktreeGitStatus> = {}): WorktreeGitStatus => ({
  ahead: 0,
  behind: 0,
  dirtyCount: 0,
  upstream: 'origin/main',
  ...over,
});

const wt = (path: string, over: Partial<WorktreeSummary> = {}): WorktreeSummary => ({
  repoId: 'r1',
  path,
  branch: path.split('/').pop() ?? null,
  head: 'abc1234',
  detached: false,
  locked: false,
  prunable: false,
  isMain: false,
  git: git(),
  sessions: [],
  ...over,
});

const repo = (id: string, label = id): RepoSummary =>
  ({ id, path: `/repos/${id}`, label, hidden: false, valid: true }) as unknown as RepoSummary;

describe('hasPendingWork', () => {
  it('un worktree propre et à jour n a rien à traiter', () => {
    expect(hasPendingWork(git())).toBe(false);
  });

  it('détecte chaque forme de travail en attente', () => {
    expect(hasPendingWork(git({ dirtyCount: 2 }))).toBe(true);
    expect(hasPendingWork(git({ stagedCount: 1 }))).toBe(true);
    expect(hasPendingWork(git({ unstagedCount: 1 }))).toBe(true);
    expect(hasPendingWork(git({ conflictCount: 1 }))).toBe(true);
    expect(hasPendingWork(git({ ahead: 3 }))).toBe(true); // rien à committer mais à pousser
  });

  it('être en retard ne demande rien de notre côté', () => {
    expect(hasPendingWork(git({ behind: 5 }))).toBe(false);
  });

  it('les compteurs fins étant optionnels dans le protocole, dirtyCount reste le filet', () => {
    // Cas d'un daemon plus ancien : ni stagedCount ni unstagedCount, seulement dirtyCount.
    expect(hasPendingWork({ ahead: 0, behind: 0, dirtyCount: 4, upstream: null })).toBe(true);
  });
});

describe('dirtyFileCount', () => {
  it('prend le maximum entre dirtyCount et la somme des compteurs fins', () => {
    expect(dirtyFileCount(git({ dirtyCount: 3 }))).toBe(3);
    expect(dirtyFileCount(git({ dirtyCount: 3, stagedCount: 2, unstagedCount: 2 }))).toBe(4);
  });
});

describe('groupWorktreesByRepo', () => {
  const repos = [repo('r1', 'alpha'), repo('r2', 'beta')];
  const byRepo: Record<string, WorktreeSummary[]> = {
    r1: [
      wt('/wt/main', { isMain: true, git: git({ dirtyCount: 2, unstagedCount: 2 }) }),
      wt('/wt/feature'),
    ],
    r2: [wt('/wt/clean', { repoId: 'r2' })],
  };
  const forRepo = (id: string): WorktreeSummary[] => byRepo[id] ?? [];

  it('ne garde que ce qui a du travail, et masque un dépôt sans worktree retenu', () => {
    const groups = groupWorktreesByRepo(repos, forRepo, { showClean: false, active: null });
    expect(groups).toHaveLength(1);
    expect(groups[0]?.repo.id).toBe('r1');
    expect(groups[0]?.worktrees.map((w) => w.path)).toEqual(['/wt/main']);
    expect(groups[0]?.dirtyFiles).toBe(2);
  });

  it('showClean inclut tout', () => {
    const groups = groupWorktreesByRepo(repos, forRepo, { showClean: true, active: null });
    expect(groups.map((g) => g.repo.id)).toEqual(['r1', 'r2']);
    expect(groups[0]?.worktrees).toHaveLength(2);
  });

  it('le worktree actif reste affiché même propre (la vue ne se vide pas après un commit)', () => {
    const groups = groupWorktreesByRepo(repos, forRepo, {
      showClean: false,
      active: { repoId: 'r2', wtPath: '/wt/clean' },
    });
    expect(groups.map((g) => g.repo.id)).toEqual(['r1', 'r2']);
    expect(groups[1]?.worktrees.map((w) => w.path)).toEqual(['/wt/clean']);
  });
});

describe('sortForIndex', () => {
  it('ce qui demande une action d abord, puis le principal, puis le chemin', () => {
    const list = [
      wt('/b/clean'),
      wt('/a/main', { isMain: true }),
      wt('/c/dirty', { git: git({ dirtyCount: 1 }) }),
    ];
    expect(sortForIndex(list).map((w) => w.path)).toEqual(['/c/dirty', '/a/main', '/b/clean']);
  });

  it('ne mute pas la liste reçue', () => {
    const list = [wt('/b'), wt('/a')];
    sortForIndex(list);
    expect(list.map((w) => w.path)).toEqual(['/b', '/a']);
  });
});

describe('pendingWorktreeCount', () => {
  it('compte les worktrees à traiter, tous dépôts visibles confondus', () => {
    const forRepo = (id: string): WorktreeSummary[] =>
      id === 'r1'
        ? [wt('/a', { git: git({ dirtyCount: 1 }) }), wt('/b')]
        : [wt('/c', { repoId: 'r2', git: git({ ahead: 2 }) })];
    expect(pendingWorktreeCount([repo('r1'), repo('r2')], forRepo)).toBe(2);
  });
});