<?php

namespace Tests\App\Services;

use App\Models\SchoolYearModel;
use App\Services\SchoolYearContextService;
use CodeIgniter\HTTP\URI;
use CodeIgniter\HTTP\UserAgent;
use CodeIgniter\Test\CIUnitTestCase;
use CodeIgniter\Test\Mock\MockIncomingRequest;
use Config\App;

final class SchoolYearContextRequest extends MockIncomingRequest
{
    public function __construct(
        private readonly array $gets = [],
        private readonly array $posts = [],
        string $method = 'GET'
    )
    {
        parent::__construct(config(App::class), new URI('https://test.alrahmaisgl.org'), 'php://input', new UserAgent());
        $this->setMethod($method);
    }

    public function getGet($key = null, $filter = null, $default = null)
    {
        if ($key === null) {
            return $this->gets;
        }

        return $this->gets[$key] ?? $default;
    }

    public function getPost($index = null, $filter = null, $flags = null)
    {
        if ($index === null) {
            return $this->posts;
        }

        return $this->posts[$index] ?? null;
    }
}

final class SchoolYearContextFakeModel extends SchoolYearModel
{
    private array $filters = [];

    public function __construct(private readonly array $rows)
    {
    }

    public function find($id = null)
    {
        return $this->rows[(int) $id] ?? null;
    }

    public function active(): ?array
    {
        foreach ($this->rows as $row) {
            if (($row['status'] ?? '') === 'active') {
                return $row;
            }
        }

        return null;
    }

    public function where($key, $value = null, ?bool $escape = null)
    {
        $this->filters[] = [$key, $value];

        return $this;
    }

    public function orderBy($orderBy, string $direction = '', ?bool $escape = null)
    {
        return $this;
    }

    public function findAll(?int $limit = null, int $offset = 0)
    {
        $rows = array_values(array_filter($this->rows, function (array $row): bool {
            foreach ($this->filters as [$key, $value]) {
                if (($row[$key] ?? null) !== $value) {
                    return false;
                }
            }

            return true;
        }));

        $this->filters = [];

        return $limit !== null ? array_slice($rows, $offset, $limit) : array_slice($rows, $offset);
    }

    public function first()
    {
        return $this->findAll(1)[0] ?? null;
    }
}

final class SchoolYearContextServiceTest extends CIUnitTestCase
{
    protected function setUp(): void
    {
        parent::setUp();

        if (method_exists(session(), 'isStarted') && ! session()->isStarted()) {
            session()->start();
        }
    }

    public function testClosedSessionSelectionIsRetainedAsExplicitReadonlyContext(): void
    {
        session()->set('selected_school_year_id', 1);

        $service = new SchoolYearContextService(new SchoolYearContextFakeModel([
            1 => ['id' => 1, 'name' => '2025-2026', 'status' => 'closed'],
            2 => ['id' => 2, 'name' => '2026-2027', 'status' => 'active'],
        ]));

        $context = $service->resolve(new SchoolYearContextRequest());

        $this->assertSame(1, $context->id());
        $this->assertSame('2025-2026', $context->yearName());
        $this->assertTrue($context->isReadonly());
        $this->assertTrue($context->isExplicitSelection());
        $this->assertSame(1, session()->get('selected_school_year_id'));
    }

    public function testPostSchoolYearNameTakesPrecedenceOverActiveYearForWrites(): void
    {
        $service = new SchoolYearContextService(new SchoolYearContextFakeModel([
            1 => ['id' => 1, 'name' => '2025-2026', 'status' => 'closed'],
            2 => ['id' => 2, 'name' => '2026-2027', 'status' => 'active'],
        ]));

        $context = $service->resolve(new SchoolYearContextRequest(
            posts: ['school_year' => '2025-2026'],
            method: 'POST'
        ));

        $this->assertSame(1, $context->id());
        $this->assertSame('2025-2026', $context->yearName());
        $this->assertTrue($context->isReadonly());
        $this->assertTrue($context->isExplicitSelection());
    }

    public function testPostSchoolYearIdTakesPrecedenceOverActiveYearForWrites(): void
    {
        $service = new SchoolYearContextService(new SchoolYearContextFakeModel([
            1 => ['id' => 1, 'name' => '2025-2026', 'status' => 'closed'],
            2 => ['id' => 2, 'name' => '2026-2027', 'status' => 'active'],
        ]));

        $context = $service->resolve(new SchoolYearContextRequest(
            posts: ['school_year_id' => '1'],
            method: 'POST'
        ));

        $this->assertSame(1, $context->id());
        $this->assertSame('2025-2026', $context->yearName());
        $this->assertTrue($context->isReadonly());
    }

    public function testCanResolveContextFromStoredSchoolYearName(): void
    {
        $service = new SchoolYearContextService(new SchoolYearContextFakeModel([
            1 => ['id' => 1, 'name' => '2025-2026', 'status' => 'closed'],
            2 => ['id' => 2, 'name' => '2026-2027', 'status' => 'active'],
        ]));

        $context = $service->forYearName('2025-2026');

        $this->assertSame(1, $context->id());
        $this->assertSame('2025-2026', $context->yearName());
        $this->assertTrue($context->isReadonly());
        $this->assertTrue($context->isExplicitSelection());
    }

    public function testInvalidSessionSelectionFallsBackToActiveYearAndClearsSession(): void
    {
        session()->set('selected_school_year_id', 99);

        $service = new SchoolYearContextService(new SchoolYearContextFakeModel([
            2 => ['id' => 2, 'name' => '2026-2027', 'status' => 'active'],
        ]));

        $context = $service->resolve(new SchoolYearContextRequest());

        $this->assertSame(2, $context->id());
        $this->assertSame('2026-2027', $context->yearName());
        $this->assertNull(session()->get('selected_school_year_id'));
    }

    public function testSelectingActiveYearClearsHistoricalOverride(): void
    {
        session()->set('selected_school_year_id', 1);
        session()->set('class_section_id', 44);
        session()->set('semester', 'Fall');
        session()->set('active_school_year', '2025-2026');

        $service = new SchoolYearContextService(new SchoolYearContextFakeModel([
            1 => ['id' => 1, 'name' => '2025-2026', 'status' => 'closed'],
            2 => ['id' => 2, 'name' => '2026-2027', 'status' => 'Active'],
        ]));

        $context = $service->select(2);

        $this->assertSame(2, $context->id());
        $this->assertTrue($context->isActive());
        $this->assertFalse($context->isExplicitSelection());
        $this->assertNull(session()->get('selected_school_year_id'));
        $this->assertNull(session()->get('class_section_id'));
        $this->assertNull(session()->get('semester'));
        $this->assertNull(session()->get('active_school_year'));
    }

    public function testSingleClosingYearIsUsedAsReadonlyContextWhenNoActiveYearExists(): void
    {
        $service = new SchoolYearContextService(new SchoolYearContextFakeModel([
            1 => ['id' => 1, 'name' => '2025-2026', 'status' => 'closing'],
            2 => ['id' => 2, 'name' => '2026-2027', 'status' => 'draft'],
        ]));

        $context = $service->resolve(new SchoolYearContextRequest());

        $this->assertSame(1, $context->id());
        $this->assertSame('2025-2026', $context->yearName());
        $this->assertSame('closing', $context->status());
        $this->assertTrue($context->isReadonly());
        $this->assertFalse($context->isExplicitSelection());
    }
}