<?php

namespace Encoder;

use Domain\Normalizer\Normalizer;
use Illuminate\Support\Collection;

class CsvEncoder implements StringEncoder
{
    public function __construct(
        private Normalizer $normalizer,
        private string $columnSeparator = ',',
        private string $rowSeparator = PHP_EOL,
    )
    {
    }

    public function encode(Collection $items): string
    {
        $items = $items->values();
        $buffer = implode($this->columnSeparator, $this->normalizer->getHeaders());
        $buffer .= $this->rowSeparator;

        $items->each(function (object $object) use (&$buffer) {
            $normalized = $this->normalizer->normalize($object);
            $buffer .= collect($normalized)
                ->map([CsvEncoder::class, 'formatBoolean'])
                ->map([CsvEncoder::class, 'formatEmpty'])
                ->implode($this->columnSeparator);
            $buffer .= $this->rowSeparator;
        });

        return $buffer;
    }

    public static function formatBoolean(mixed $value): mixed
    {
        if (!is_bool($value)) {
            return $value;
        }
        return true === $value ? 'yes' : 'no';
    }

    public static function formatEmpty(mixed $value): mixed
    {
        return empty($value) ? '-' : $value;
    }
}