<?php

namespace App\Text;

use App\Text\Text;
use App\Text\CreateTextDto;
use App\Text\TextRepository;
use App\User\User;
use App\User\UserRepository;
use DomainException;

class JsonTextRepository implements TextRepository
{
    private string $filePath;

    public function __construct(
        private UserRepository $userRepo,
    ) {
        $this->filePath = __DIR__ . '/../../data/texts.json';
    }

    public function create(CreateTextDto $dto): Text
    {
        $texts = $this->readTexts();
        $id = $this->getNextId($texts);

        $text = new Text(
            id: $id,
            name: $dto->name,
            user: $dto->user,
        );
        $texts[] = [
            'id' => $id,
            'name' => $dto->name,
            'userId' => $dto->user->getId(),
        ];

        $this->writeTexts($texts);

        return $text;
    }

    public function find(int $id): ?Text
    {
        $texts = $this->readTexts();

        foreach ($texts as $data) {
            if ($data['id'] === $id) {
                return $this->hydrate($data);
            }
        }

        return null;
    }

    /**
     * @return Text[]
     */
    public function getAll(): array
    {
        $texts = $this->readTexts();

        return array_map(
            function (array $data) {
                return $this->hydrate($data);
            },
            $texts
        );
    }

    /**
     * @return Text[]
     */
    public function findByUser(User $user): array
    {
        $texts = $this->readTexts();
        $userId = $user->getId();
        $owned = array_filter(
            $texts,
            function (array $data) use ($userId) {
                return $data['userId'] === $userId;
            }
        );

        return array_map(
            function (array $data) {
                return $this->hydrate($data);
            },
            array_values($owned)
        );
    }

    private function hydrate(array $data): Text
    {
        $user = $this->userRepo->find($data['userId']);
        if ($user === null) {
            throw new DomainException(
                "User with id: {$data['userId']} doesnt exist"
            );
        }

        return new Text(
            id: $data['id'],
            name: $data['name'],
            user: $user,
        );
    }

    /**
     * @return array
     */
    private function readTexts(): array
    {
        if (!file_exists($this->filePath)) {
            return [];
        }

        $content = file_get_contents($this->filePath);

        return json_decode($content, true) ?? [];
    }

    /**
     * @param array $texts
     */
    private function writeTexts(array $texts): void
    {
        file_put_contents(
            $this->filePath,
            json_encode($texts, JSON_PRETTY_PRINT)
        );
    }

    /**
     * @param array $texts
     */
    private function getNextId(array $texts): int
    {
        if (empty($texts)) {
            return 1;
        }

        $maxId = 0;
        foreach ($texts as $text) {
            if ($text['id'] > $maxId) {
                $maxId = $text['id'];
            }
        }

        return $maxId + 1;
    }
}