<?php

namespace Tests\Unit\Services\Promotions;

use App\Models\StudentPromotionRecord;
use App\Services\Promotions\PromotionAuditService;
use App\Services\Promotions\PromotionStatusService;
use Illuminate\Foundation\Testing\RefreshDatabase;
use Illuminate\Support\Facades\DB;
use RuntimeException;
use Tests\TestCase;

class PromotionStatusServiceTest extends TestCase
{
    use RefreshDatabase;

    public function test_allowed_transition_updates_status_and_audit_log(): void
    {
        $record = $this->makeRecord(StudentPromotionRecord::STATUS_AWAITING_PARENT);
        $service = $this->makeService();

        $updated = $service->transition(
            $record,
            StudentPromotionRecord::STATUS_ENROLLMENT_STARTED,
            42,
            'parent began enrollment'
        );

        $this->assertSame(StudentPromotionRecord::STATUS_ENROLLMENT_STARTED, $updated->promotion_status);
        $this->assertDatabaseHas('promotion_audit_log', [
            'promotion_id' => $record->getKey(),
            'action_type' => 'status_changed',
            'old_value' => StudentPromotionRecord::STATUS_AWAITING_PARENT,
            'new_value' => StudentPromotionRecord::STATUS_ENROLLMENT_STARTED,
            'user_id' => 42,
        ]);
    }

    public function test_disallowed_transition_throws(): void
    {
        $record = $this->makeRecord(StudentPromotionRecord::STATUS_NOT_REVIEWED);
        $service = $this->makeService();

        $this->expectException(RuntimeException::class);
        $service->transition($record, StudentPromotionRecord::STATUS_PROMOTED_AND_ENROLLED, 1);
    }

    public function test_force_status_bypasses_transition_map(): void
    {
        $record = $this->makeRecord(StudentPromotionRecord::STATUS_NOT_REVIEWED);
        $service = $this->makeService();

        $updated = $service->forceStatus($record, StudentPromotionRecord::STATUS_PROMOTED_AND_ENROLLED, 7, 'manual fix');

        $this->assertSame(StudentPromotionRecord::STATUS_PROMOTED_AND_ENROLLED, $updated->promotion_status);
        $this->assertDatabaseHas('promotion_audit_log', [
            'promotion_id' => $record->getKey(),
            'action_type' => 'manual_override',
            'field' => 'promotion_status',
            'old_value' => StudentPromotionRecord::STATUS_NOT_REVIEWED,
            'new_value' => StudentPromotionRecord::STATUS_PROMOTED_AND_ENROLLED,
        ]);
    }

    public function test_no_op_transition_returns_record_unchanged(): void
    {
        $record = $this->makeRecord(StudentPromotionRecord::STATUS_AWAITING_PARENT);
        $service = $this->makeService();

        $updated = $service->transition(
            $record,
            StudentPromotionRecord::STATUS_AWAITING_PARENT,
            1
        );

        $this->assertSame(StudentPromotionRecord::STATUS_AWAITING_PARENT, $updated->promotion_status);
        $this->assertDatabaseMissing('promotion_audit_log', [
            'promotion_id' => $record->getKey(),
            'action_type' => 'status_changed',
        ]);
    }

    private function makeService(): PromotionStatusService
    {
        return new PromotionStatusService(new PromotionAuditService());
    }

    private function makeRecord(string $status): StudentPromotionRecord
    {
        $studentId = DB::table('students')->insertGetId([
            'school_id' => 'S-1',
            'firstname' => 'Test',
            'lastname' => 'Student',
            'parent_id' => 1,
            'year_of_registration' => '2025',
            'school_year' => '2025-2026',
            'semester' => 'Fall',
        ]);

        return StudentPromotionRecord::query()->create([
            'student_id' => $studentId,
            'parent_id' => 1,
            'current_school_year' => '2025-2026',
            'next_school_year' => '2026-2027',
            'promotion_status' => $status,
            'enrollment_required' => true,
            'enrollment_status' => StudentPromotionRecord::ENROLLMENT_NOT_STARTED,
        ]);
    }
}