<?php

declare(strict_types=1);

use App\Models\Tenant;
use App\Services\Billing\RunwayCalculator;
use Illuminate\Foundation\Testing\DatabaseTransactions;
use Illuminate\Support\Facades\DB;

/**
 * F3 (17.06.2026): единый расчёт runway для биллинга и дашборда.
 * daysLeft(tenantId, affordableLeads):
 *   affordable<=0 → 0; нет списаний за 30 дн → null;
 *   иначе floor(affordable / (lead_charges за 30 дн / 30)).
 */
uses(DatabaseTransactions::class);

/** Вставляет $count списаний с датой $chargedAt (deferred FK на deals — тест откатывается). */
function seedLeadCharges(int $tenantId, int $count, string $chargedAt): void
{
    DB::statement('SET app.current_tenant_id = '.$tenantId);
    for ($i = 0; $i < $count; $i++) {
        DB::table('lead_charges')->insert([
            'tenant_id' => $tenantId,
            'deal_id' => 900000 + $i,
            'deal_received_at' => $chargedAt,
            'tier_no' => 1,
            'price_per_lead_kopecks' => 50000,
            'charge_source' => 'rub',
            'charged_at' => $chargedAt,
            'created_at' => now()->toDateTimeString(),
        ]);
    }
}

test('daysLeft = 0 если affordableLeads <= 0', function () {
    $tenant = Tenant::factory()->create();
    expect(app(RunwayCalculator::class)->daysLeft($tenant->id, 0))->toBe(0);
    expect(app(RunwayCalculator::class)->daysLeft($tenant->id, -5))->toBe(0);
});

test('daysLeft = null если нет списаний за 30 дней', function () {
    $tenant = Tenant::factory()->create();
    expect(app(RunwayCalculator::class)->daysLeft($tenant->id, 100))->toBeNull();
});

test('daysLeft = floor(affordable / средний дневной за 30 дней)', function () {
    $tenant = Tenant::factory()->create();
    seedLeadCharges($tenant->id, 30, now()->subDays(5)->toDateTimeString()); // 30/30 = 1 лид/день
    expect(app(RunwayCalculator::class)->daysLeft($tenant->id, 90))->toBe(90);
});

test('daysLeft игнорирует списания старше 30 дней', function () {
    $tenant = Tenant::factory()->create();
    seedLeadCharges($tenant->id, 30, now()->subDays(40)->toDateTimeString()); // вне окна
    expect(app(RunwayCalculator::class)->daysLeft($tenant->id, 90))->toBeNull();
});