<?php

use App\Enums\CreditTransactionType;
use App\Exceptions\InsufficientCreditsException;
use App\Models\User;
use App\Services\Billing\CreditWalletService;

beforeEach(function (): void {
    $this->service = app(CreditWalletService::class);
});

test('a credit raises the balance and writes a ledger row', function () {
    $user = User::factory()->create();

    $tx = $this->service->credit($user, 20, CreditTransactionType::Topup, 'Paket 20');

    expect($this->service->balance($user))->toBe(20);
    expect($tx->amount_credits)->toBe(20);
    expect($tx->balance_after)->toBe(20);
    expect($tx->type)->toBe(CreditTransactionType::Topup);
});

test('a debit lowers the balance and records the balance after', function () {
    $user = User::factory()->create();
    $this->service->credit($user, 20);

    $tx = $this->service->debit($user, 12, 'Extra-PM');

    expect($this->service->balance($user))->toBe(8);
    expect($tx->amount_credits)->toBe(-12);
    expect($tx->balance_after)->toBe(8);
    expect($tx->type)->toBe(CreditTransactionType::Spend);
});

test('debiting more than the balance throws and keeps the balance untouched', function () {
    $user = User::factory()->create();
    $this->service->credit($user, 8);

    $threw = null;
    try {
        $this->service->debit($user, 15);
    } catch (InsufficientCreditsException $e) {
        $threw = $e;
    }

    expect($threw)->toBeInstanceOf(InsufficientCreditsException::class);
    expect($threw->shortfall())->toBe(7);
    expect($this->service->balance($user))->toBe(8);
    expect($user->creditTransactions()->count())->toBe(1); // nur die Aufladung
});

test('balance is zero and canAfford is false without a wallet', function () {
    $user = User::factory()->create();

    expect($this->service->balance($user))->toBe(0);
    expect($this->service->canAfford($user, 1))->toBeFalse();
});

test('a refund credits back a prior spend', function () {
    $user = User::factory()->create();
    $this->service->credit($user, 30);
    $this->service->debit($user, 25, 'Depublizieren');

    $this->service->credit($user, 25, CreditTransactionType::Refund, 'Widerruf Depublizieren');

    expect($this->service->balance($user))->toBe(30);
});