<?php

namespace Tests\Unit\Node\UseCases;

use App\Exceptions\BadRequestException;
use App\Node\Node;
use App\Node\NodeRepository;
use App\Node\UseCases\CreateNode;
use App\Node\UseCases\CreateNodeRequest;
use App\Text\CreateTextDto;
use App\Text\Text;
use App\User\UseCases\CreateUserDto;
use App\ValueObjects\EmailAddress;
use DomainException;
use PHPUnit\Framework\TestCase;
use Tests\Fakes\FakeNodeRepository;
use Tests\Fakes\FakeTextRepository;
use Tests\Fakes\FakeUserRepository;

class CreateNodeTest extends TestCase
{
    private FakeTextRepository $textRepo;
    private FakeNodeRepository $nodeRepo;
    private CreateNode $useCase;

    public function setUp(): void
    {
        $userRepo = new FakeUserRepository();
        $user = $userRepo->create(new CreateUserDto(
            email: new EmailAddress('a@b.com'),
            passwordHash: '',
            isAdmin: false,
        ));
        $this->textRepo = new FakeTextRepository();
        $this->textRepo->create(new CreateTextDto(
            name: 'text',
            user: $user,
        ));
        $this->nodeRepo = new FakeNodeRepository();
        $this->useCase = new CreateNode(
            nodeRepo: $this->nodeRepo,
            textRepo: $this->textRepo,
        );
    }

    public function test_create_node(): void
    {
        $node = $this->useCase->execute(new CreateNodeRequest(
            textId: 0,
            title: 'test',
            parentNodeId: null,
        ));
        $this->assertInstanceOf(NodeRepository::class, $this->nodeRepo);
        $this->assertInstanceOf(Node::class, $node);
        $this->assertEquals('test', $node->getTitle());
        $this->assertEquals(0, $node->getId());
        $this->assertEquals(null, $node->getParentNode());
    }

    public function test_node_belongs_to_text(): void
    {
        $node = $this->useCase->execute(new CreateNodeRequest(
            textId: 0,
            title: 'test',
            parentNodeId: null,
        ));
        $this->assertInstanceOf(Text::class, $node->getText());
    }

    public function test_throws_if_text_doesnt_exist(): void
    {
        $this->expectException(DomainException::class);
        $this->expectExceptionMessage("Text with id: 1 doesnt exist");
        $this->useCase->execute(new CreateNodeRequest(
            textId: 1,
            title: 'test',
            parentNodeId: null,
        ));
    }

    public function test_has_parent_node(): void
    {
        $node1 = $this->useCase->execute(new CreateNodeRequest(
            textId: 0,
            title: 'test',
            parentNodeId: null,
        ));
        $node2 = $this->useCase->execute(new CreateNodeRequest(
            textId: 0,
            title: 'test',
            parentNodeId: $node1->getId(),
        ));
        $this->assertEquals(
            $node1->getId(),
            $node2->getParentNode()->getId()
        );
    }

    public function test_nonexistant_parent_id_throws(): void
    {
        $this->expectException(DomainException::class);
        $this->expectExceptionMessage("Node with id: 0 doesnt exist");
        $this->useCase->execute(new CreateNodeRequest(
            textId: 0,
            title: 'test',
            parentNodeId: 0,
        ));
    }

    public function test_one_root_node_per_text(): void
    {
        $this->expectException(DomainException::class);
        $this->expectExceptionMessage('A root node already exists for this text');
        $this->useCase->execute(new CreateNodeRequest(
            textId: 0,
            title: 'test',
            parentNodeId: null,
        ));
        $this->useCase->execute(new CreateNodeRequest(
            textId: 0,
            title: 'test',
            parentNodeId: null,
        ));
    }

    public function test_throws_if_text_id_is_null(): void
    {
        $this->expectException(BadRequestException::class);
        $this->expectExceptionMessage('textId is required');

        $this->useCase->execute(new CreateNodeRequest(
            textId: null,
            title: 'test',
            parentNodeId: null,
        ));
    }

    public function test_throws_if_title_is_null(): void
    {
        $this->expectException(BadRequestException::class);
        $this->expectExceptionMessage('title is required');

        $this->useCase->execute(new CreateNodeRequest(
            textId: 0,
            title: null,
            parentNodeId: null,
        ));
    }
}