<?php

declare(strict_types=1);

namespace Uwil\ArcadiaApiPhpClient\Lib\ApiDto\Dto\IncoCompo;

/**
 * Base implementation for NutriDto.
 *
 * Concrete classes must implement:
 *   - fieldLabels(): array<string, string>   - [ propertyName => 'Human label' ]
 *   - fieldUnits():  array<string, string|null> - [ propertyName => 'unit'|null ]
 *
 * toArray() is built automatically via reflection on public properties.
 */
abstract readonly class AbstractIncoCompoPartDto implements IncoCompoPartDto
{
    /**
     * Map of [ propertyName => 'Human readable label' ].
     *
     * @return array<string, string>
     */
    abstract protected static function fieldLabels(): array;

    /**
     * Map of [ propertyName => 'unit string or null' ].
     *
     * @return array<string, string|null>
     */
    abstract protected static function fieldUnits(): array;

    // -------------------------------------------------------------------------

    /**
     * {@inheritDoc}
     */
    public function toArray(): array
    {
        /** @var array<string, float|string|null> $result */
        $result = [];

        foreach (get_object_vars($this) as $name => $value) {
            if (\is_float($value) || \is_string($value) || $value === null) {
                $result[(string) $name] = $value;
            }
        }

        return $result;
    }

    /**
     * {@inheritDoc}
     */
    public function humanReadableValues(): array
    {
        $values = $this->toArray();
        $out    = [];

        foreach (static::fieldLabels() as $property => $label) {
            $out[$label] = $values[$property] ?? null;
        }

        return $out;
    }

    /**
     * {@inheritDoc}
     */
    public static function units(): array
    {
        return static::fieldUnits();
    }

    /**
     * {@inheritDoc}
     */
    public static function humanReadableUnits(): array
    {
        $out = [];

        foreach (static::fieldLabels() as $property => $label) {
            $units = static::fieldUnits();
            if (\array_key_exists($property, $units)) {
                $out[$label] = $units[$property];
            }
        }

        return $out;
    }

    /**
     * {@inheritDoc}
     *
     * @return array<string, float|string|null>
     */
    public function jsonSerialize(): array
    {
        return array_filter(
            $this->toArray(),
            static fn (mixed $value): bool => $value !== null,
        );
    }

    /**
     * {@inheritDoc}
     */
    public function __toString(): string
    {
        $values = $this->humanReadableValues();
        $units  = static::humanReadableUnits();

        $lines = [];
        foreach ($values as $label => $value) {
            $unit    = $units[$label] ?? null;
            $lines[] = $label . ' : ' . $value . ($unit !== null ? ' ' . $unit : '');
        }

        return \implode("\n", $lines);
    }
}