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<?php

/**
 * League.Csv (https://csv.thephpleague.com)
 *
 * (c) Ignace Nyamagana Butera <[email protected]>
 *
 * For the full copyright and license information, please view the LICENSE
 * file that was distributed with this source code.
 */

declare(strict_types=1);

namespace League\Csv\Serializer;

use DateTime;
use DateTimeImmutable;
use DateTimeInterface;
use DateTimeZone;
use ReflectionClass;
use ReflectionParameter;
use ReflectionProperty;
use Throwable;

use function class_exists;
use function is_string;

/**
 * @implements TypeCasting<DateTimeImmutable|DateTime|null>
 */
final class CastToDate implements TypeCasting
{
    /** @var class-string */
    private string $class;
    private readonly bool $isNullable;
    private DateTimeImmutable|DateTime|null $default = null;
    private readonly Type $type;
    private readonly string $propertyName;
    private ?DateTimeZone $timezone = null;
    private ?string $format = null;

    /**
     * @throws MappingFailed
     */
    public function __construct(
        ReflectionProperty|ReflectionParameter $reflectionProperty,
    ) {
        [$this->type, $this->class, $this->isNullable] = $this->init($reflectionProperty);
        $this->propertyName = $reflectionProperty->getName();
    }

    /**
     * @param ?class-string $className
     *
     * @throws MappingFailed
     */
    public function setOptions(
        ?string $default = null,
        ?string $format = null,
        DateTimeZone|string|null $timezone = null,
        ?string $className = null
    ): void {
        $this->class = match (true) {
            !interface_exists($this->class) && !Type::Mixed->equals($this->type) => $this->class,
            DateTimeInterface::class === $this->class && null === $className => DateTimeImmutable::class,
            interface_exists($this->class) && null !== $className && class_exists($className) && (new ReflectionClass($className))->implementsInterface($this->class) => $className,
            default => throw new MappingFailed('`'.$this->propertyName.'` type is `'.($this->class ?? 'mixed').'` but the specified class via the `$className` argument is invalid or could not be found.'),
        };

        try {
            $this->format = $format;
            $this->timezone = is_string($timezone) ? new DateTimeZone($timezone) : $timezone;
            $this->default = (null !== $default) ? $this->cast($default) : $default;
        } catch (Throwable $exception) {
            throw new MappingFailed('The `timezone` and/or `format` options used for `'.self::class.'` are invalud.', 0, $exception);
        }
    }

    /**
     * @throws TypeCastingFailed
     */
    public function toVariable(?string $value): DateTimeImmutable|DateTime|null
    {
        return match (true) {
            null !== $value && '' !== $value => $this->cast($value),
            $this->isNullable => $this->default,
            default => throw TypeCastingFailed::dueToNotNullableType($this->class),
        };
    }

    /**
     * @throws TypeCastingFailed
     */
    private function cast(string $value): DateTimeImmutable|DateTime
    {
        try {
            $date = null !== $this->format ?
                ($this->class)::createFromFormat($this->format, $value, $this->timezone) :
                new ($this->class)($value, $this->timezone);
            if (false === $date) {
                throw TypeCastingFailed::dueToInvalidValue($value, $this->class);
            }
        } catch (Throwable $exception) {
            if ($exception instanceof TypeCastingFailed) {
                throw $exception;
            }

            throw TypeCastingFailed::dueToInvalidValue($value, $this->class, $exception);
        }

        return $date;
    }

    /**
     * @throws MappingFailed
     *
     * @return array{0:Type, 1:class-string<DateTimeInterface>, 2:bool}
     */
    private function init(ReflectionProperty|ReflectionParameter $reflectionProperty): array
    {
        if (null === $reflectionProperty->getType()) {
            return [Type::Mixed, DateTimeInterface::class, true];
        }

        $type = null;
        $isNullable = false;
        foreach (Type::list($reflectionProperty) as $found) {
            if (!$isNullable && $found[1]->allowsNull()) {
                $isNullable = true;
            }

            if (null === $type && $found[0]->isOneOf(Type::Mixed, Type::Date)) {
                $type = $found;
            }
        }

        if (null === $type) {
            throw throw MappingFailed::dueToTypeCastingUnsupportedType($reflectionProperty, $this, DateTimeInterface::class, 'mixed');
        }

        /** @var class-string<DateTimeInterface> $className */
        $className = $type[1]->getName();

        return [$type[0], $className, $isNullable];
    }
}