import { describe, it, expect, vi } from 'vitest';
import { deleteSubject } from '$lib/features/subjects/api/deleteSubject';

const API = 'http://test.classeo.local:18000/api';

function makeResponse(status: number, body?: Record<string, unknown>): Response {
	const init: ResponseInit = { status };
	if (body !== undefined) {
		init.headers = { 'Content-Type': 'application/json' };
	}
	return new Response(body !== undefined ? JSON.stringify(body) : null, init);
}

describe('deleteSubject', () => {
	it('envoie DELETE sans confirm quand hasGrades=false', async () => {
		const fetchFn = vi.fn().mockResolvedValueOnce(makeResponse(204));

		const result = await deleteSubject({ id: 'abc', hasGrades: false }, fetchFn, API);

		expect(fetchFn).toHaveBeenCalledWith(`${API}/subjects/abc`, { method: 'DELETE' });
		expect(result).toEqual({ status: 'success' });
	});

	it('envoie DELETE sans confirm quand hasGrades=null (pour laisser le backend décider)', async () => {
		const fetchFn = vi.fn().mockResolvedValueOnce(makeResponse(204));

		await deleteSubject({ id: 'abc', hasGrades: null }, fetchFn, API);

		expect(fetchFn).toHaveBeenCalledWith(`${API}/subjects/abc`, { method: 'DELETE' });
	});

	it('ajoute ?confirm=true quand hasGrades=true', async () => {
		const fetchFn = vi.fn().mockResolvedValueOnce(makeResponse(204));

		await deleteSubject({ id: 'abc', hasGrades: true }, fetchFn, API);

		expect(fetchFn).toHaveBeenCalledWith(`${API}/subjects/abc?confirm=true`, { method: 'DELETE' });
	});

	it('retourne un status conflict avec le message backend sur 409', async () => {
		const fetchFn = vi.fn().mockResolvedValueOnce(
			makeResponse(409, {
				'hydra:description':
					'Cette matière est liée à 3 évaluation(s) et 12 note(s). Confirmez la suppression pour continuer.'
			})
		);

		const result = await deleteSubject({ id: 'abc', hasGrades: null }, fetchFn, API);

		expect(result).toEqual({
			status: 'conflict',
			message:
				'Cette matière est liée à 3 évaluation(s) et 12 note(s). Confirmez la suppression pour continuer.'
		});
	});

	it('retourne un status error sur autre code HTTP', async () => {
		const fetchFn = vi
			.fn()
			.mockResolvedValueOnce(makeResponse(500, { detail: 'Internal server error' }));

		const result = await deleteSubject({ id: 'abc', hasGrades: false }, fetchFn, API);

		expect(result).toEqual({ status: 'error', message: 'Internal server error' });
	});

	it('fallback message si pas de payload JSON', async () => {
		const fetchFn = vi.fn().mockResolvedValueOnce(makeResponse(403));

		const result = await deleteSubject({ id: 'abc', hasGrades: false }, fetchFn, API);

		expect(result).toEqual({ status: 'error', message: 'Erreur lors de la suppression (403)' });
	});

	it('extrait message depuis le champ `message`', async () => {
		const fetchFn = vi.fn().mockResolvedValueOnce(makeResponse(409, { message: 'Conflit' }));

		const result = await deleteSubject({ id: 'abc', hasGrades: null }, fetchFn, API);

		expect(result).toEqual({ status: 'conflict', message: 'Conflit' });
	});
});