<?php

namespace Tests\Feature;

use App\Models\CustomerHostingOrder;
use App\Models\HostingAccount;
use App\Models\HostingAccountAlert;
use App\Models\HostingProduct;
use App\Models\User;
use App\Notifications\HostingResourceWarningNotification;
use App\Services\Hosting\HostingResourcePolicyService;
use App\Services\Hosting\Providers\SharedNodeProvider;
use Illuminate\Foundation\Testing\RefreshDatabase;
use Illuminate\Support\Facades\Notification;
use Tests\TestCase;

class HostingResourcePolicyServiceTest extends TestCase
{
    use RefreshDatabase;

    public function test_it_warns_when_disk_usage_is_near_the_account_limit(): void
    {
        Notification::fake();

        $account = $this->makeAccount([
            'allocated_disk_gb' => 10,
            'disk_used_bytes' => (int) (9.1 * 1073741824),
            'inode_limit' => 50000,
            'inode_count' => 1000,
            'cpu_limit_percent' => 50,
            'cpu_usage_percent' => 10,
            'memory_limit_mb' => 512,
            'memory_used_mb' => 128,
            'process_limit' => 10,
            'process_count' => 2,
        ]);

        $provider = \Mockery::mock(SharedNodeProvider::class);
        $provider->shouldReceive('applyAccountResourceProfile')->never();
        $provider->shouldReceive('suspendAccount')->never();
        $this->app->instance(SharedNodeProvider::class, $provider);

        app(HostingResourcePolicyService::class)->process($account);

        $account->refresh();

        $this->assertTrue($account->is_flagged);
        $this->assertSame(HostingAccount::RESOURCE_STATUS_ACTIVE, $account->resource_status);
        $this->assertDatabaseHas('hosting_account_alerts', [
            'hosting_account_id' => $account->id,
            'alert_type' => HostingAccountAlert::TYPE_WARNING,
            'is_resolved' => false,
        ]);

        Notification::assertSentTo($account->user, HostingResourceWarningNotification::class);
    }

    public function test_it_throttles_an_account_when_cpu_limit_is_exceeded(): void
    {
        Notification::fake();

        $account = $this->makeAccount([
            'cpu_limit_percent' => 50,
            'cpu_usage_percent' => 90,
            'memory_limit_mb' => 512,
            'memory_used_mb' => 128,
            'process_limit' => 10,
            'process_count' => 3,
            'inode_limit' => 50000,
            'inode_count' => 1000,
            'throttled_at' => now()->subHours(25),
            'cpu_breach_streak' => 11,
        ]);

        $provider = \Mockery::mock(SharedNodeProvider::class);
        $provider->shouldReceive('applyAccountResourceProfile')->once()->withArgs(
            fn (HostingAccount $candidate, bool $throttled): bool => $candidate->id === $account->id && $throttled === true
        )->andReturn(true);
        $provider->shouldReceive('suspendAccount')->never();
        $this->app->instance(SharedNodeProvider::class, $provider);

        app(HostingResourcePolicyService::class)->process($account);

        $account->refresh();

        $this->assertSame(HostingAccount::STATUS_ACTIVE, $account->status);
        $this->assertSame(HostingAccount::RESOURCE_STATUS_THROTTLED, $account->resource_status);
        $this->assertNotNull($account->throttled_at);
        $this->assertDatabaseHas('hosting_account_alerts', [
            'hosting_account_id' => $account->id,
            'alert_type' => HostingAccountAlert::TYPE_THROTTLED,
            'is_resolved' => false,
        ]);
    }

    public function test_it_suspends_a_throttled_account_when_abuse_continues(): void
    {
        Notification::fake();

        $account = $this->makeAccount([
            'status' => HostingAccount::STATUS_ACTIVE,
            'resource_status' => HostingAccount::RESOURCE_STATUS_THROTTLED,
            'cpu_limit_percent' => 50,
            'cpu_usage_percent' => 10,
            'memory_limit_mb' => 512,
            'memory_used_mb' => 1024,
            'process_limit' => 10,
            'process_count' => 3,
            'inode_limit' => 50000,
            'inode_count' => 1000,
            'throttled_at' => now()->subHours(25),
            'memory_breach_streak' => 11,
        ]);

        $order = CustomerHostingOrder::create([
            'user_id' => $account->user_id,
            'hosting_product_id' => $account->hosting_product_id,
            'hosting_account_id' => $account->id,
            'domain_name' => $account->primary_domain ?: 'example.test',
            'billing_cycle' => CustomerHostingOrder::CYCLE_MONTHLY,
            'amount_paid' => 10,
            'currency' => 'GHS',
            'status' => CustomerHostingOrder::STATUS_ACTIVE,
        ]);

        $provider = \Mockery::mock(SharedNodeProvider::class);
        $provider->shouldReceive('applyAccountResourceProfile')->never();
        $provider->shouldReceive('suspendAccount')->once()->withArgs(
            fn (HostingAccount $candidate, string $reason): bool => $candidate->id === $account->id && str_contains($reason, 'Memory usage')
        )->andReturn(true);
        $this->app->instance(SharedNodeProvider::class, $provider);

        app(HostingResourcePolicyService::class)->process($account);

        $account->refresh();
        $order->refresh();

        $this->assertSame(HostingAccount::STATUS_SUSPENDED, $account->status);
        $this->assertSame(HostingAccount::RESOURCE_STATUS_SUSPENDED, $account->resource_status);
        $this->assertSame(CustomerHostingOrder::STATUS_SUSPENDED, $order->status);
        $this->assertDatabaseHas('hosting_account_alerts', [
            'hosting_account_id' => $account->id,
            'alert_type' => HostingAccountAlert::TYPE_SUSPENDED,
            'is_resolved' => false,
        ]);
        Notification::assertNothingSent();
    }

    public function test_it_unsuspends_an_automatically_suspended_account_when_usage_returns_to_normal(): void
    {
        Notification::fake();

        $account = $this->makeAccount([
            'status' => HostingAccount::STATUS_SUSPENDED,
            'resource_status' => HostingAccount::RESOURCE_STATUS_SUSPENDED,
            'cpu_limit_percent' => 50,
            'cpu_usage_percent' => 0,
            'memory_limit_mb' => 512,
            'memory_used_mb' => 128,
            'process_limit' => 10,
            'process_count' => 2,
            'inode_limit' => 50000,
            'inode_count' => 1000,
            'suspension_reason' => 'CPU usage reached 110.6% against a 50% limit.',
            'suspended_at' => now()->subMinutes(10),
            'metadata' => [
                'suspension_origin' => 'automatic',
            ],
        ]);

        $provider = \Mockery::mock(SharedNodeProvider::class);
        $provider->shouldReceive('unsuspendAccount')->once()->withArgs(
            fn (HostingAccount $candidate): bool => $candidate->id === $account->id
        )->andReturn(true);
        $provider->shouldReceive('applyAccountResourceProfile')->once()->withArgs(
            fn (HostingAccount $candidate, bool $throttled): bool => $candidate->id === $account->id && $throttled === false
        )->andReturn(true);
        $provider->shouldReceive('suspendAccount')->never();
        $this->app->instance(SharedNodeProvider::class, $provider);

        app(HostingResourcePolicyService::class)->process($account);

        $account->refresh();

        $this->assertSame(HostingAccount::STATUS_ACTIVE, $account->status);
        $this->assertSame(HostingAccount::RESOURCE_STATUS_ACTIVE, $account->resource_status);
        $this->assertNull($account->suspended_at);
        $this->assertNull($account->suspension_reason);
        $this->assertFalse($account->uploads_restricted);
    }

    public function test_it_does_not_unsuspend_a_manually_suspended_account_when_usage_is_normal(): void
    {
        Notification::fake();

        $account = $this->makeAccount([
            'status' => HostingAccount::STATUS_SUSPENDED,
            'resource_status' => HostingAccount::RESOURCE_STATUS_SUSPENDED,
            'cpu_limit_percent' => 50,
            'cpu_usage_percent' => 0,
            'memory_limit_mb' => 512,
            'memory_used_mb' => 128,
            'process_limit' => 10,
            'process_count' => 2,
            'inode_limit' => 50000,
            'inode_count' => 1000,
            'suspension_reason' => 'Manual suspension.',
            'suspended_at' => now()->subMinutes(10),
            'metadata' => [
                'suspension_origin' => 'manual',
            ],
        ]);

        $provider = \Mockery::mock(SharedNodeProvider::class);
        $provider->shouldReceive('applyAccountResourceProfile')->never();
        $provider->shouldReceive('unsuspendAccount')->never();
        $provider->shouldReceive('suspendAccount')->never();
        $this->app->instance(SharedNodeProvider::class, $provider);

        app(HostingResourcePolicyService::class)->process($account);

        $account->refresh();

        $this->assertSame(HostingAccount::STATUS_SUSPENDED, $account->status);
        $this->assertSame(HostingAccount::RESOURCE_STATUS_SUSPENDED, $account->resource_status);
        $this->assertNotNull($account->suspended_at);
        $this->assertSame('Manual suspension.', $account->suspension_reason);
    }

    public function test_it_applies_slug_specific_inode_limits_for_single_domain_products(): void
    {
        $starter = HostingProduct::query()->updateOrCreate([
            'slug' => 'starter-plan',
        ], [
            'name' => 'Starter Plan',
            'category' => HostingProduct::CATEGORY_SHARED,
            'type' => HostingProduct::TYPE_SINGLE_DOMAIN,
            'price_monthly' => 1,
            'currency' => 'GHS',
            'disk_gb' => 5,
            'max_domains' => 1,
            'is_active' => true,
            'is_visible' => true,
        ]);

        $basic = HostingProduct::query()->updateOrCreate([
            'slug' => 'basic-plan',
        ], [
            'name' => 'Basic Plan',
            'category' => HostingProduct::CATEGORY_SHARED,
            'type' => HostingProduct::TYPE_SINGLE_DOMAIN,
            'price_monthly' => 25,
            'currency' => 'GHS',
            'disk_gb' => 10,
            'max_domains' => 1,
            'is_active' => true,
            'is_visible' => true,
        ]);

        $plus = HostingProduct::query()->updateOrCreate([
            'slug' => 'plus-plan',
        ], [
            'name' => 'Plus Plan',
            'category' => HostingProduct::CATEGORY_SHARED,
            'type' => HostingProduct::TYPE_SINGLE_DOMAIN,
            'price_monthly' => 35,
            'currency' => 'GHS',
            'disk_gb' => 20,
            'max_domains' => 1,
            'is_active' => true,
            'is_visible' => true,
        ]);

        $growth = HostingProduct::query()->updateOrCreate([
            'slug' => 'growth-plan',
        ], [
            'name' => 'Growth Plan',
            'category' => HostingProduct::CATEGORY_SHARED,
            'type' => HostingProduct::TYPE_MULTI_DOMAIN,
            'price_monthly' => 55,
            'currency' => 'GHS',
            'disk_gb' => 30,
            'max_domains' => 5,
            'is_active' => true,
            'is_visible' => true,
        ]);

        $pro = HostingProduct::query()->updateOrCreate([
            'slug' => 'pro-plan',
        ], [
            'name' => 'Pro Plan',
            'category' => HostingProduct::CATEGORY_SHARED,
            'type' => HostingProduct::TYPE_MULTI_DOMAIN,
            'price_monthly' => 175,
            'currency' => 'GHS',
            'disk_gb' => 150,
            'max_domains' => -1,
            'is_active' => true,
            'is_visible' => true,
        ]);

        $service = app(HostingResourcePolicyService::class);

        $this->assertSame(225000, $service->defaultLimitsForProduct($starter)['inode_limit']);
        $this->assertSame(450000, $service->defaultLimitsForProduct($basic)['inode_limit']);
        $this->assertSame(450000, $service->defaultLimitsForProduct($plus)['inode_limit']);
        $this->assertSame(750000, $service->defaultLimitsForProduct($growth)['inode_limit']);
        $this->assertSame(1200000, $service->defaultLimitsForProduct($pro)['inode_limit']);
    }

    private function makeAccount(array $overrides = []): HostingAccount
    {
        $user = User::factory()->create();
        $product = HostingProduct::create([
            'name' => 'Resource Test Hosting',
            'slug' => 'resource-test-hosting-' . str()->random(6),
            'category' => HostingProduct::CATEGORY_SHARED,
            'type' => HostingProduct::TYPE_SINGLE_DOMAIN,
            'price_monthly' => 10,
            'currency' => 'GHS',
            'disk_gb' => 10,
            'max_domains' => 1,
            'is_active' => true,
            'is_visible' => true,
        ]);

        return HostingAccount::create(array_merge([
            'user_id' => $user->id,
            'hosting_product_id' => $product->id,
            'username' => 'acct' . random_int(1000, 9999),
            'primary_domain' => 'resource-test.example',
            'type' => HostingAccount::TYPE_SHARED,
            'status' => HostingAccount::STATUS_ACTIVE,
            'allocated_disk_gb' => 10,
            'cpu_limit_percent' => 50,
            'memory_limit_mb' => 512,
            'process_limit' => 10,
            'io_limit_mb' => 5,
            'inode_limit' => 50000,
            'resource_status' => HostingAccount::RESOURCE_STATUS_ACTIVE,
        ], $overrides));
    }
}