<?php

declare(strict_types=1);

namespace App\Tests\Unit\Scolarite\Application\Query\GetStudentProgression;

use App\Scolarite\Application\Query\GetStudentProgression\GetStudentProgressionHandler;
use App\Scolarite\Application\Query\GetStudentProgression\GetStudentProgressionQuery;
use App\Scolarite\Domain\Service\TeacherStatisticsCalculator;
use App\Scolarite\Infrastructure\ReadModel\InMemoryTeacherStatisticsReader;
use PHPUnit\Framework\Attributes\Test;
use PHPUnit\Framework\TestCase;

final class GetStudentProgressionHandlerTest extends TestCase
{
    private InMemoryTeacherStatisticsReader $reader;
    private GetStudentProgressionHandler $handler;

    protected function setUp(): void
    {
        $this->reader = new InMemoryTeacherStatisticsReader();
        $this->handler = new GetStudentProgressionHandler(
            $this->reader,
            new TeacherStatisticsCalculator(),
        );
    }

    #[Test]
    public function itReturnsEmptyProgressionWhenNoGrades(): void
    {
        $result = ($this->handler)($this->query());

        self::assertSame([], $result->grades);
        self::assertNull($result->trendLine);
    }

    #[Test]
    public function itReturnsSingleGradeWithNoTrendLine(): void
    {
        $this->reader->feedGradeHistory([
            ['date' => '2026-01-15', 'value' => 12.0, 'evaluationTitle' => 'Contrôle 1'],
        ]);

        $result = ($this->handler)($this->query());

        self::assertCount(1, $result->grades);
        self::assertSame('2026-01-15', $result->grades[0]->date);
        self::assertSame(12.0, $result->grades[0]->value);
        self::assertNull($result->trendLine);
    }

    #[Test]
    public function itComputesTrendLineFromMultipleGrades(): void
    {
        $this->reader->feedGradeHistory([
            ['date' => '2026-01-15', 'value' => 10.0, 'evaluationTitle' => 'Contrôle 1'],
            ['date' => '2026-02-10', 'value' => 12.0, 'evaluationTitle' => 'Contrôle 2'],
            ['date' => '2026-03-05', 'value' => 14.0, 'evaluationTitle' => 'Contrôle 3'],
        ]);

        $result = ($this->handler)($this->query());

        self::assertCount(3, $result->grades);
        self::assertNotNull($result->trendLine);
        self::assertGreaterThan(0, $result->trendLine->slope); // Positive trend
    }

    private function query(): GetStudentProgressionQuery
    {
        return new GetStudentProgressionQuery(
            studentId: '550e8400-e29b-41d4-a716-446655440050',
            subjectId: '550e8400-e29b-41d4-a716-446655440030',
            classId: '550e8400-e29b-41d4-a716-446655440020',
            teacherId: '550e8400-e29b-41d4-a716-446655440010',
            tenantId: '550e8400-e29b-41d4-a716-446655440001',
        );
    }
}