<?php

declare(strict_types=1);

namespace DTS;

class BookmarkRepository implements \Iterator
{
    private string $pathToRepository;

    private array $repository = [];

    private int $position = 0;

    function __construct(string $pathToRepository)
    {
        $this->pathToRepository = $pathToRepository;
    }

    public function load(): void
    {
        if (!is_file($this->pathToRepository) || !is_readable($this->pathToRepository)) {
            throw new \Exception("Unable to locate repository {$this->pathToRepository}");
        }

        if (($fp = fopen($this->pathToRepository, 'r')) === FALSE) {
            throw new \Exception("Unable to read from repository {$this->pathToRepository}");
        }

        while (($data = fgetcsv($fp)) !== FALSE) {
            $this->repository[] = new Bookmark(
                $data[0],       // Id.
                $data[1],       // Url.
                $data[2],       // Title.
                $data[3],       // Tag.
                $data[4],       // Added At.
                (bool)$data[4], // Read.
            );
        }

        fclose($fp);
    }

    public function sort(bool $asc = true): BookmarkRepository
    {
        usort($this->repository, function ($a, $b) use ($asc) {
            return $asc ? $a->addedAt <=> $b->addedAt
                : $b->addedAt <=> $a->addedAt;
        });

        return $this;
    }

    public function filter(string $tag): BookmarkRepository
    {
        $this->repository = array_filter(
            $this->repository,
            fn($bookmark) => $bookmark->tag === $tag
        );

        return $this;
    }

    public function add(Bookmark $bookmark): bool
    {
        if (($fp = fopen($this->pathToRepository, 'a')) === FALSE) {
            throw new \Exception("Unable to open repository {$this->pathToRepository}");
        }

        $saved = fputcsv($fp, [
            $bookmark->id,
            $bookmark->url,
            $bookmark->title,
            $bookmark->tag,
            $bookmark->addedAt,
            (int)$bookmark->unread,
        ]);

        fclose($fp);

        return $saved !== false;
    }

    public function current(): mixed
    {
        return $this->repository[$this->position];
    }

    public function key(): mixed
    {
        return $this->position;
    }

    public function next(): void
    {
        ++$this->position;
    }

    public function rewind(): void
    {
        $this->position = 0;
    }

    public function valid(): bool
    {
        return isset($this->repository[$this->position]);
    }
}