<?php

declare(strict_types=1);

namespace Tests\Feature\FormBuilder\Bindings;

// RFC V4 — concurrent recovery via firstOrCreate semantics under
// lockForUpdate windows. State-injection PHPUnit assertion (per
// RFC §4 V4) — wall-clock concurrent load testing is a separate
// workstream tracked in BACKLOG: LOAD-TEST-FOUNDATION.

use App\FormBuilder\Bindings\PersonProvisioner;
use App\Models\CrowdType;
use App\Models\Event;
use App\Models\FormBuilder\FormField;
use App\Models\FormBuilder\FormFieldBinding;
use App\Models\FormBuilder\FormSchema;
use App\Models\FormBuilder\FormSubmission;
use App\Models\FormBuilder\FormValue;
use App\Models\Organisation;
use App\Models\Person;
use Illuminate\Foundation\Testing\RefreshDatabase;
use Illuminate\Support\Facades\DB;
use Illuminate\Support\Str;
use Tests\TestCase;

final class PersonProvisionerConcurrencyTest extends TestCase
{
    use RefreshDatabase;

    public function test_concurrent_provisioning_resolves_to_single_person_via_first_or_create(): void
    {
        $event = Event::factory()->create();
        $organisation = Organisation::query()->find($event->organisation_id) ?? Organisation::factory()->create();
        $crowdType = CrowdType::factory()->create([
            'organisation_id' => $organisation->id,
            'is_active' => true,
        ]);

        $submission = $this->makeSubmission($event, 'race@test.nl');

        DB::transaction(function () use ($submission, $crowdType): void {
            // Transaction A inside lockForUpdate window — finds no Person yet
            $existing = Person::query()
                ->withoutGlobalScopes()
                ->where('email', 'race@test.nl')
                ->where('event_id', $submission->event_id)
                ->lockForUpdate()
                ->first();
            $this->assertNull($existing);

            // Inject: simulate transaction B has already inserted the Person
            // (in real production, lockForUpdate would block this; we
            // simulate the post-block state to assert recovery semantics)
            DB::table('persons')->insert([
                'id' => (string) Str::ulid(),
                'event_id' => $submission->event_id,
                'crowd_type_id' => $crowdType->id,
                'email' => 'race@test.nl',
                'first_name' => 'Pre',
                'last_name' => 'Existing',
                'is_blacklisted' => false,
                'created_at' => now(),
                'updated_at' => now(),
            ]);

            // Transaction A's firstOrCreate must recover and return the
            // existing row rather than creating a duplicate.
            $person = $this->app->make(PersonProvisioner::class)
                ->provisionFromSubmission($submission);

            $this->assertSame('race@test.nl', $person->email);
            $this->assertSame(
                1,
                Person::query()
                    ->withoutGlobalScopes()
                    ->where('email', 'race@test.nl')
                    ->where('event_id', $submission->event_id)
                    ->count(),
            );
        });
    }

    private function makeSubmission(Event $event, string $email): FormSubmission
    {
        $schema = FormSchema::factory()->create(['organisation_id' => $event->organisation_id]);
        $emailField = FormField::factory()->create(['form_schema_id' => $schema->id, 'slug' => 'email']);
        $binding = FormFieldBinding::factory()->forField($emailField)->entityOwned('person', 'email')
            ->create(['is_identity_key' => true, 'merge_strategy' => 'overwrite', 'trust_level' => 80]);

        $submission = FormSubmission::factory()->forEvent($event)->create(['form_schema_id' => $schema->id]);
        $submission->schema_snapshot = [
            'fields' => [[
                'id' => (string) $emailField->id,
                'slug' => 'email',
                'sort_order' => 0,
                'bindings' => [[
                    'id' => (string) $binding->id,
                    'mode' => 'entity_owned',
                    'entity' => 'person',
                    'column' => 'email',
                    'merge_strategy' => 'overwrite',
                    'trust_level' => 80,
                    'is_identity_key' => true,
                ]],
            ]],
        ];
        $submission->save();

        $row = new FormValue();
        $row->form_submission_id = $submission->id;
        $row->form_field_id = $emailField->id;
        $row->setAttribute('value', $email);
        $row->value_anonymised = false;
        $row->save();

        return $submission->fresh();
    }
}