<?php

namespace Tests\Feature;

use App\Models\Customer;
use App\Models\Purchase;
use App\Models\User;
use Illuminate\Foundation\Testing\RefreshDatabase;
use Tests\TestCase;

class PurchaseTest extends TestCase
{
    use RefreshDatabase;

    private function customer(array $attributes = []): Customer
    {
        $customer = new Customer();

        $customer->forceFill(array_merge([
            'lan_id'        => 1,
            'name'          => 'Erik Olsson',
            'guardian_name' => 'Karin Olsson',
            'deposit'       => 500,
            'amount_left'   => 500,
            'give_leftover' => 0,
            'is_in_group'   => 0,
        ], $attributes))->save();

        return $customer;
    }

    private function asUser(): self
    {
        $this->actingAs(User::factory()->create(), 'sanctum');

        return $this;
    }

    public function test_a_purchase_is_recorded_and_taken_off_the_balance(): void
    {
        $customer = $this->customer(['deposit' => 500, 'amount_left' => 500]);

        $this->asUser()->postJson('/api/register_purchase', [
            'customer_id' => $customer->id,
            'amount'      => 120,
        ])->assertRedirect('customer/' . $customer->id);

        $customer->refresh();
        $this->assertSame(380, $customer->amount_left);
        // What was paid in is history and does not change when something is bought
        $this->assertSame(500, $customer->deposit);

        $purchase = Purchase::first();
        $this->assertSame($customer->id, $purchase->customer_id);
        $this->assertSame(120, $purchase->amount);
    }

    public function test_several_purchases_add_up(): void
    {
        $customer = $this->customer(['deposit' => 500, 'amount_left' => 500]);

        foreach ([100, 50, 25] as $amount) {
            $this->asUser()->postJson('/api/register_purchase', [
                'customer_id' => $customer->id,
                'amount'      => $amount,
            ]);
        }

        $this->assertSame(325, $customer->refresh()->amount_left);
        $this->assertSame(3, Purchase::count());
    }

    public function test_the_purchase_shows_up_on_the_customer(): void
    {
        $customer = $this->customer();

        $this->asUser()->postJson('/api/register_purchase', [
            'customer_id' => $customer->id,
            'amount'      => 120,
        ]);

        $this->assertSame(1, $customer->purchases()->count());
        $this->assertSame(120, $customer->purchases()->first()->amount);
    }

    public function test_a_purchase_larger_than_the_balance_makes_it_negative(): void
    {
        // Nothing stops this today — the kiosk staff is trusted to check the balance
        $customer = $this->customer(['deposit' => 100, 'amount_left' => 100]);

        $this->asUser()->postJson('/api/register_purchase', [
            'customer_id' => $customer->id,
            'amount'      => 250,
        ]);

        $this->assertSame(-150, $customer->refresh()->amount_left);
    }

    public function test_a_group_purchase_is_taken_from_the_group_balance(): void
    {
        // Purchases are registered from the account page, so for a group it is the
        // group's own customer row that is charged
        $group = $this->customer([
            'lan_id' => 10, 'name' => 'Klanen', 'deposit' => 800, 'amount_left' => 800,
            'is_in_group' => 0, 'customer_group_id' => 7,
        ]);
        $this->customer([
            'lan_id' => 11, 'name' => 'Anna', 'deposit' => 0, 'amount_left' => 0,
            'is_in_group' => 1, 'customer_group_id' => 7,
        ]);

        $this->asUser()->postJson('/api/register_purchase', [
            'customer_id' => $group->id,
            'amount'      => 200,
        ]);

        $this->assertSame(600, $group->refresh()->amount_left);
    }

    public function test_it_requires_a_customer(): void
    {
        $this->asUser()->postJson('/api/register_purchase', ['amount' => 120])
            ->assertStatus(422);

        $this->assertSame(0, Purchase::count());
    }

    public function test_an_unknown_customer_gives_404_and_writes_nothing(): void
    {
        $this->asUser()->postJson('/api/register_purchase', [
            'customer_id' => 999999,
            'amount'      => 120,
        ])->assertStatus(404);

        // No line item for a purchase that no balance ever paid for
        $this->assertSame(0, Purchase::count());
    }

    public function test_the_purchase_and_the_deduction_are_written_together(): void
    {
        $customer = $this->customer(['deposit' => 500, 'amount_left' => 500]);

        $this->asUser()->postJson('/api/register_purchase', [
            'customer_id' => $customer->id,
            'amount'      => 120,
        ]);

        // The balance always matches what the line items add up to
        $this->assertSame(1, Purchase::count());
        $this->assertSame(500 - (int) Purchase::sum('amount'), $customer->refresh()->amount_left);
    }

    public function test_the_endpoint_is_closed_to_anyone_not_logged_in(): void
    {
        $customer = $this->customer();

        $this->postJson('/api/register_purchase', [
            'customer_id' => $customer->id,
            'amount'      => 120,
        ])->assertStatus(401);

        $this->assertSame(500, $customer->refresh()->amount_left);
        $this->assertSame(0, Purchase::count());
    }
}