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

import { prisma } from '@/lib/db';
import type { Slot } from '@/lib/schedule/types';
import { toDraft, type WeekDraft } from '@/lib/schedule/week';

import { hasDatabase, resetDatabase } from './helpers';

// The real module pulls in NextAuth, which drags half of Next into a test that
// only cares about what reaches the database.
const caller = { email: 'test@ita-ito.test', role: 'admin' as const };
const gate = vi.hoisted(() => ({ result: { ok: true, value: { email: 'test@ita-ito.test', role: 'admin' as const } } }));

vi.mock('@/lib/auth/actions', () => ({
  requireAdmin: async () => gate.result,
}));
vi.mock('next/cache', () => ({ revalidatePath: () => undefined }));

const { saveWeek } = await import('@/app/admin/horaires/actions');

const FULL: Slot[] = [{ open: '10:00', close: '18:30' }];

async function storedWeek(): Promise<WeekDraft> {
  const rows = await prisma.weeklySchedule.findMany();
  return toDraft(
    rows.map((row) => ({
      dayOfWeek: row.dayOfWeek,
      isClosed: row.isClosed,
      slots: (row.slots as Slot[] | null) ?? [],
    })),
  );
}

function withDay(week: WeekDraft, dayOfWeek: number, patch: Partial<WeekDraft[number]>): WeekDraft {
  return week.map((day) => (day.dayOfWeek === dayOfWeek ? { ...day, ...patch } : day));
}

describe.skipIf(!hasDatabase)('saveWeek', () => {
  beforeEach(async () => {
    gate.result = { ok: true, value: caller };
    await resetDatabase();
    await prisma.auditLog.deleteMany();
  });

  it('persists a changed day and names it in the result', async () => {
    const week = withDay(await storedWeek(), 1, { isClosed: false, slots: FULL });
    const result = await saveWeek(week);

    expect(result).toEqual({ ok: true, changed: [1] });
    const monday = await prisma.weeklySchedule.findUnique({ where: { dayOfWeek: 1 } });
    expect(monday?.isClosed).toBe(false);
    expect(monday?.slots).toEqual(FULL);
  });

  it('writes one readable audit entry', async () => {
    await saveWeek(withDay(await storedWeek(), 1, { isClosed: false, slots: FULL }));

    const entries = await prisma.auditLog.findMany();
    expect(entries).toHaveLength(1);
    expect(entries[0]).toMatchObject({
      userEmail: caller.email,
      action: 'weekly_schedule.update',
      entity: 'WeeklySchedule',
    });
    // The diff names the day in French and shows both states, so the log can
    // be read without cross-referencing the schema.
    expect(entries[0]?.diff).toEqual({
      Lundi: { before: 'Fermé', after: '10:00–18:30' },
    });
  });

  it('writes nothing at all when nothing moved', async () => {
    const result = await saveWeek(await storedWeek());

    expect(result).toEqual({ ok: true, changed: [] });
    // No audit entry either: a log full of empty saves is a log nobody reads.
    expect(await prisma.auditLog.count()).toBe(0);
  });

  it('ignores a reordering that changes nothing', async () => {
    const split: Slot[] = [
      { open: '10:00', close: '13:00' },
      { open: '14:00', close: '18:30' },
    ];
    await saveWeek(withDay(await storedWeek(), 2, { isClosed: false, slots: split }));
    await prisma.auditLog.deleteMany();

    const reordered = withDay(await storedWeek(), 2, {
      isClosed: false,
      slots: [split[1]!, split[0]!],
    });
    expect(await saveWeek(reordered)).toEqual({ ok: true, changed: [] });
  });

  it('refuses overlapping slots and does not touch the database', async () => {
    const before = await storedWeek();
    const result = await saveWeek(
      withDay(before, 2, {
        isClosed: false,
        slots: [
          { open: '10:00', close: '14:00' },
          { open: '13:00', close: '18:30' },
        ],
      }),
    );

    expect(result.ok).toBe(false);
    if (!result.ok) {
      expect(result.dayErrors?.[2]?.join(' ')).toMatch(/chevauchent/);
    }
    expect(await storedWeek()).toEqual(before);
  });

  it('refuses an open day with no hours', async () => {
    const result = await saveWeek(
      withDay(await storedWeek(), 2, { isClosed: false, slots: [] }),
    );
    expect(result.ok).toBe(false);
  });

  it('drops the leftover slots of a day being closed', async () => {
    await saveWeek(withDay(await storedWeek(), 2, { isClosed: true, slots: FULL }));
    const tuesday = await prisma.weeklySchedule.findUnique({ where: { dayOfWeek: 2 } });
    expect(tuesday?.isClosed).toBe(true);
    expect(tuesday?.slots).toEqual([]);
  });

  it('refuses a read-only account and leaves the week alone', async () => {
    const before = await storedWeek();
    gate.result = { ok: false, error: 'Ce compte est en lecture seule.' } as never;

    const result = await saveWeek(withDay(before, 1, { isClosed: false, slots: FULL }));

    expect(result.ok).toBe(false);
    expect(await storedWeek()).toEqual(before);
    expect(await prisma.auditLog.count()).toBe(0);
  });
});