<?php

declare(strict_types=1);

namespace Roave\BetterReflection\Reflection\StringCast;

use Roave\BetterReflection\Reflection\ReflectionFunction;
use Roave\BetterReflection\Reflection\ReflectionParameter;

use function array_reduce;
use function assert;
use function count;
use function is_string;
use function sprintf;

/** @internal */
final class ReflectionFunctionStringCast
{
    /**
     * @return non-empty-string
     *
     * @psalm-pure
     */
    public static function toString(ReflectionFunction $functionReflection): string
    {
        $parametersFormat = $functionReflection->getNumberOfParameters() > 0 || $functionReflection->hasReturnType()
            ? "\n\n  - Parameters [%d] {%s\n  }"
            : '';

        $returnTypeFormat = $functionReflection->hasReturnType()
            ? "\n  - Return [ %s ]"
            : '';

        $string = sprintf(
            'Function [ <%s> function %s ] {%s' . $parametersFormat . $returnTypeFormat . "\n}",
            self::sourceToString($functionReflection),
            $functionReflection->getName(),
            self::fileAndLinesToString($functionReflection),
            count($functionReflection->getParameters()),
            self::parametersToString($functionReflection),
            self::returnTypeToString($functionReflection),
        );
        assert($string !== '');

        return $string;
    }

    /** @psalm-pure */
    private static function sourceToString(ReflectionFunction $functionReflection): string
    {
        if ($functionReflection->isUserDefined()) {
            return 'user';
        }

        $extensionName = $functionReflection->getExtensionName();
        assert(is_string($extensionName));

        return sprintf('internal:%s', $extensionName);
    }

    /** @psalm-pure */
    private static function fileAndLinesToString(ReflectionFunction $functionReflection): string
    {
        if ($functionReflection->isInternal()) {
            return '';
        }

        $fileName = $functionReflection->getFileName();
        if ($fileName === null) {
            return '';
        }

        return sprintf("\n  @@ %s %d - %d", $fileName, $functionReflection->getStartLine(), $functionReflection->getEndLine());
    }

    /** @psalm-pure */
    private static function parametersToString(ReflectionFunction $functionReflection): string
    {
        return array_reduce($functionReflection->getParameters(), static fn (string $string, ReflectionParameter $parameterReflection): string => $string . "\n    " . ReflectionParameterStringCast::toString($parameterReflection), '');
    }

    /** @psalm-pure */
    private static function returnTypeToString(ReflectionFunction $methodReflection): string
    {
        $type = $methodReflection->getReturnType();

        if ($type === null) {
            return '';
        }

        return ReflectionTypeStringCast::toString($type);
    }
}
__halt_compiler();----SIGNATURE:----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----ATTACHMENT:----ODY0MDIxOTExNzc0MjUxMyA4ODg2NDYzMzM5Mzc5MDAyIDEwMzkwOTg5NTE0NTUyMzE=