import { describe, expect, it } from 'vitest';
import { buildSettlementBody, readSettlementForm, settlementFormFromQuery } from '../../../src/lib/server/forms/settlement-form';

const fd = (o: Record<string, string>) => {
	const f = new FormData();
	for (const [k, v] of Object.entries(o)) f.append(k, v);
	return f;
};

describe('settlement form', () => {
	it('reads and builds', () => {
		const values = readSettlementForm(fd({ from: 'u_b', to: 'u_a', amount: '12.5', date: '2026-08-02', note: ' thanks ' }));
		expect(buildSettlementBody(values, ['u_a', 'u_b'])).toEqual({ ok: true, body: { from: 'u_b', to: 'u_a', amountCents: 1250, date: '2026-08-02', note: 'thanks' } });
	});

	it('validates', () => {
		const good = readSettlementForm(fd({ from: 'u_b', to: 'u_a', amount: '5', date: '2026-08-02' }));
		const errs = (v: Partial<typeof good>) => {
			const r = buildSettlementBody({ ...good, ...v }, ['u_a', 'u_b']);
			return r.ok ? {} : r.errors;
		};
		expect(errs({ to: 'u_b' })).toHaveProperty('to');
		expect(errs({ from: 'u_x' })).toHaveProperty('from');
		expect(errs({ amount: '-1' })).toHaveProperty('amount');
		expect(errs({ date: 'nope' })).toHaveProperty('date');
	});

	it('prefills from query params with a safe fallback', () => {
		const q = new URLSearchParams({ from: 'u_b', to: 'u_a', amount: '90.00' });
		expect(settlementFormFromQuery(q, 'u_b', '2026-08-29')).toEqual({ from: 'u_b', to: 'u_a', amount: '90.00', date: '2026-08-29', note: '' });
		expect(settlementFormFromQuery(new URLSearchParams(), 'u_b', '2026-08-29')).toEqual({ from: 'u_b', to: '', amount: '', date: '2026-08-29', note: '' });
	});

	it('trims and truncates query-derived values', () => {
		const q = new URLSearchParams({ from: '  u_b  ', to: '  u_a  ', amount: `  ${'9'.repeat(200)}  ` });
		const values = settlementFormFromQuery(q, 'u_b', '2026-08-29');
		expect(values.from).toBe('u_b');
		expect(values.to).toBe('u_a');
		expect(values.amount).toBe('9'.repeat(64));
		expect(values.amount.length).toBe(64);
	});
});