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<?php declare(strict_types=1);
/*
 * This file is part of sebastian/code-unit.
 *
 * (c) Sebastian Bergmann <sebastian@phpunit.de>
 *
 * For the full copyright and license information, please view the LICENSE
 * file that was distributed with this source code.
 */
namespace SebastianBergmann\CodeUnit;

use function array_keys;
use function array_merge;
use function array_unique;
use function array_values;
use function class_exists;
use function explode;
use function function_exists;
use function interface_exists;
use function ksort;
use function method_exists;
use function sort;
use function sprintf;
use function str_contains;
use function trait_exists;
use ReflectionClass;
use ReflectionFunction;
use ReflectionMethod;

final class Mapper
{
    /**
     * @return array<string,list<int>>
     */
    public function codeUnitsToSourceLines(CodeUnitCollection $codeUnits): array
    {
        $result = [];

foreach ($codeUnits as $codeUnit) {
            $sourceFileName = $codeUnit->sourceFileName();

if (!isset($result[$sourceFileName])) {
                $result[$sourceFileName] = [];
            }

$result[$sourceFileName] = array_merge($result[$sourceFileName], $codeUnit->sourceLines());
        }

foreach (array_keys($result) as $sourceFileName) {
            $result[$sourceFileName] = array_values(array_unique($result[$sourceFileName]));

sort($result[$sourceFileName]);
        }

ksort($result);

return $result;
    }

/**
     * @throws InvalidCodeUnitException
     * @throws ReflectionException
     */
    public function stringToCodeUnits(string $unit): CodeUnitCollection
    {
        if (str_contains($unit, '::')) {
            [$firstPart, $secondPart] = explode('::', $unit);

if ($this->isUserDefinedFunction($secondPart)) {
                return CodeUnitCollection::fromList(CodeUnit::forFunction($secondPart));
            }

if ($this->isUserDefinedMethod($firstPart, $secondPart)) {
                return CodeUnitCollection::fromList(CodeUnit::forClassMethod($firstPart, $secondPart));
            }

if ($this->isUserDefinedInterface($firstPart)) {
                return CodeUnitCollection::fromList(CodeUnit::forInterfaceMethod($firstPart, $secondPart));
            }

if ($this->isUserDefinedTrait($firstPart)) {
                return CodeUnitCollection::fromList(CodeUnit::forTraitMethod($firstPart, $secondPart));
            }
        } else {
            if ($this->isUserDefinedClass($unit)) {
                return CodeUnitCollection::fromList(
                    ...array_merge(
                        [CodeUnit::forClass($unit)],
                        $this->traits(new ReflectionClass($unit)),
                    ),
                );
            }

if ($this->isUserDefinedInterface($unit)) {
                return CodeUnitCollection::fromList(CodeUnit::forInterface($unit));
            }

if ($this->isUserDefinedTrait($unit)) {
                return CodeUnitCollection::fromList(CodeUnit::forTrait($unit));
            }

if ($this->isUserDefinedFunction($unit)) {
                return CodeUnitCollection::fromList(CodeUnit::forFunction($unit));
            }
        }

throw new InvalidCodeUnitException(
            sprintf(
                '"%s" is not a valid code unit',
                $unit,
            ),
        );
    }

/**
     * @phpstan-assert-if-true callable-string $functionName
     */
    private function isUserDefinedFunction(string $functionName): bool
    {
        if (!function_exists($functionName)) {
            return false;
        }

return (new ReflectionFunction($functionName))->isUserDefined();
    }

/**
     * @phpstan-assert-if-true class-string $className
     */
    private function isUserDefinedClass(string $className): bool
    {
        if (!class_exists($className)) {
            return false;
        }

return (new ReflectionClass($className))->isUserDefined();
    }

/**
     * @phpstan-assert-if-true interface-string $interfaceName
     */
    private function isUserDefinedInterface(string $interfaceName): bool
    {
        if (!interface_exists($interfaceName)) {
            return false;
        }

return (new ReflectionClass($interfaceName))->isUserDefined();
    }

/**
     * @phpstan-assert-if-true trait-string $traitName
     */
    private function isUserDefinedTrait(string $traitName): bool
    {
        if (!trait_exists($traitName)) {
            return false;
        }

return (new ReflectionClass($traitName))->isUserDefined();
    }

/**
     * @phpstan-assert-if-true class-string $className
     */
    private function isUserDefinedMethod(string $className, string $methodName): bool
    {
        if (!class_exists($className)) {
            return false;
        }

if (!method_exists($className, $methodName)) {
            return false;
        }

return (new ReflectionMethod($className, $methodName))->isUserDefined();
    }

/**
     * @param ReflectionClass<object> $class
     *
     * @return list<TraitUnit>
     */
    private function traits(ReflectionClass $class): array
    {
        $result = [];

foreach ($class->getTraits() as $trait) {
            if (!$trait->isUserDefined()) {
                // @codeCoverageIgnoreStart
                continue;
                // @codeCoverageIgnoreEnd
            }

$result[] = CodeUnit::forTrait($trait->getName());

$result = array_merge($result, $this->traits($trait));
        }

return $result;
    }
}