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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_replace;

use function strpos;

use function trait_exists;

use ReflectionClass;

use ReflectionFunction;

use ReflectionMethod;

final class Mapper

{

    /**

     * @psalm-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 (strpos($unit, '::') !== false) {

            [$firstPart, $secondPart] = explode('::', $unit);

            if (empty($firstPart) && $this->isUserDefinedFunction($secondPart)) {

                return CodeUnitCollection::fromList(CodeUnit::forFunction($secondPart));

            }

            if ($this->isUserDefinedClass($firstPart)) {

                if ($secondPart === '<public>') {

                    return $this->publicMethodsOfClass($firstPart);

                }

                if ($secondPart === '<!public>') {

                    return $this->protectedAndPrivateMethodsOfClass($firstPart);

                }

                if ($secondPart === '<protected>') {

                    return $this->protectedMethodsOfClass($firstPart);

                }

                if ($secondPart === '<!protected>') {

                    return $this->publicAndPrivateMethodsOfClass($firstPart);

                }

                if ($secondPart === '<private>') {

                    return $this->privateMethodsOfClass($firstPart);

                }

                if ($secondPart === '<!private>') {

                    return $this->publicAndProtectedMethodsOfClass($firstPart);

                }

                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)) {

                $units = [CodeUnit::forClass($unit)];

                foreach ($this->reflectorForClass($unit)->getTraits() as $trait) {

                    if (!$trait->isUserDefined()) {

                        // @codeCoverageIgnoreStart

                        continue;

                        // @codeCoverageIgnoreEnd

                    }

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

                }

                return CodeUnitCollection::fromArray($units);

            }

            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));

            }

            $unit = str_replace('<extended>', '', $unit);

            if ($this->isUserDefinedClass($unit)) {

                return $this->classAndParentClassesAndTraits($unit);

            }

        }

        throw new InvalidCodeUnitException(

            sprintf(

                '"%s" is not a valid code unit',

                $unit

            )

        );

    }

    /**

     * @psalm-param class-string $className

     *

     * @throws ReflectionException

     */

    private function publicMethodsOfClass(string $className): CodeUnitCollection

    {

        return $this->methodsOfClass($className, ReflectionMethod::IS_PUBLIC);

    }

    /**

     * @psalm-param class-string $className

     *

     * @throws ReflectionException

     */

    private function publicAndProtectedMethodsOfClass(string $className): CodeUnitCollection

    {

        return $this->methodsOfClass($className, ReflectionMethod::IS_PUBLIC | ReflectionMethod::IS_PROTECTED);

    }

    /**

     * @psalm-param class-string $className

     *

     * @throws ReflectionException

     */

    private function publicAndPrivateMethodsOfClass(string $className): CodeUnitCollection

    {

        return $this->methodsOfClass($className, ReflectionMethod::IS_PUBLIC | ReflectionMethod::IS_PRIVATE);

    }

    /**

     * @psalm-param class-string $className

     *

     * @throws ReflectionException

     */

    private function protectedMethodsOfClass(string $className): CodeUnitCollection

    {

        return $this->methodsOfClass($className, ReflectionMethod::IS_PROTECTED);

    }

    /**

     * @psalm-param class-string $className

     *

     * @throws ReflectionException

     */

    private function protectedAndPrivateMethodsOfClass(string $className): CodeUnitCollection

    {

        return $this->methodsOfClass($className, ReflectionMethod::IS_PROTECTED | ReflectionMethod::IS_PRIVATE);

    }

    /**

     * @psalm-param class-string $className

     *

     * @throws ReflectionException

     */

    private function privateMethodsOfClass(string $className): CodeUnitCollection

    {

        return $this->methodsOfClass($className, ReflectionMethod::IS_PRIVATE);

    }

    /**

     * @psalm-param class-string $className

     *

     * @throws ReflectionException

     */

    private function methodsOfClass(string $className, int $filter): CodeUnitCollection

    {

        $units = [];

        foreach ($this->reflectorForClass($className)->getMethods($filter) as $method) {

            if (!$method->isUserDefined()) {

                continue;

            }

            $units[] = CodeUnit::forClassMethod($className, $method->getName());

        }

        return CodeUnitCollection::fromArray($units);

    }

    /**

     * @psalm-param class-string $className

     *

     * @throws ReflectionException

     */

    private function classAndParentClassesAndTraits(string $className): CodeUnitCollection

    {

        $units = [CodeUnit::forClass($className)];

        $reflector = $this->reflectorForClass($className);

        foreach ($this->reflectorForClass($className)->getTraits() as $trait) {

            if (!$trait->isUserDefined()) {

                // @codeCoverageIgnoreStart

                continue;

                // @codeCoverageIgnoreEnd

            }

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

        }

        while ($reflector = $reflector->getParentClass()) {

            if (!$reflector->isUserDefined()) {

                break;

            }

            $units[] = CodeUnit::forClass($reflector->getName());

            foreach ($reflector->getTraits() as $trait) {

                if (!$trait->isUserDefined()) {

                    // @codeCoverageIgnoreStart

                    continue;

                    // @codeCoverageIgnoreEnd

                }

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

            }

        }

        return CodeUnitCollection::fromArray($units);

    }

    /**

     * @psalm-param class-string $className

     *

     * @throws ReflectionException

     */

    private function reflectorForClass(string $className): ReflectionClass

    {

        try {

            return new ReflectionClass($className);

            // @codeCoverageIgnoreStart

        } catch (\ReflectionException $e) {

            throw new ReflectionException(

                $e->getMessage(),

                (int) $e->getCode(),

                $e

            );

        }

        // @codeCoverageIgnoreEnd

    }

    /**

     * @throws ReflectionException

     */

    private function isUserDefinedFunction(string $functionName): bool

    {

        if (!function_exists($functionName)) {

            return false;

        }

        try {

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

            // @codeCoverageIgnoreStart

        } catch (\ReflectionException $e) {

            throw new ReflectionException(

                $e->getMessage(),

                (int) $e->getCode(),

                $e

            );

        }

        // @codeCoverageIgnoreEnd

    }

    /**

     * @throws ReflectionException

     */

    private function isUserDefinedClass(string $className): bool

    {

        if (!class_exists($className)) {

            return false;

        }

        try {

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

            // @codeCoverageIgnoreStart

        } catch (\ReflectionException $e) {

            throw new ReflectionException(

                $e->getMessage(),

                (int) $e->getCode(),

                $e

            );

        }

        // @codeCoverageIgnoreEnd

    }

    /**

     * @throws ReflectionException

     */

    private function isUserDefinedInterface(string $interfaceName): bool

    {

        if (!interface_exists($interfaceName)) {

            return false;

        }

        try {

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

            // @codeCoverageIgnoreStart

        } catch (\ReflectionException $e) {

            throw new ReflectionException(

                $e->getMessage(),

                (int) $e->getCode(),

                $e

            );

        }

        // @codeCoverageIgnoreEnd

    }

    /**

     * @throws ReflectionException

     */

    private function isUserDefinedTrait(string $traitName): bool

    {

        if (!trait_exists($traitName)) {

            return false;

        }

        try {

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

            // @codeCoverageIgnoreStart

        } catch (\ReflectionException $e) {

            throw new ReflectionException(

                $e->getMessage(),

                (int) $e->getCode(),

                $e

            );

        }

        // @codeCoverageIgnoreEnd

    }

    /**

     * @throws ReflectionException

     */

    private function isUserDefinedMethod(string $className, string $methodName): bool

    {

        if (!class_exists($className)) {

            // @codeCoverageIgnoreStart

            return false;

            // @codeCoverageIgnoreEnd

        }

        if (!method_exists($className, $methodName)) {

            // @codeCoverageIgnoreStart

            return false;

            // @codeCoverageIgnoreEnd

        }

        try {

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

            // @codeCoverageIgnoreStart

        } catch (\ReflectionException $e) {

            throw new ReflectionException(

                $e->getMessage(),

                (int) $e->getCode(),

                $e

            );

        }

        // @codeCoverageIgnoreEnd

    }

}