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<?php declare(strict_types=1);

namespace PhpDocReader;

use PhpDocReader\PhpParser\UseStatementParser;
use ReflectionClass;
use ReflectionMethod;
use ReflectionParameter;
use ReflectionProperty;
use Reflector;

/**
 * PhpDoc reader
 */
class PhpDocReader
{
    /** @var UseStatementParser */
    private $parser;

private const PRIMITIVE_TYPES = [
        'bool' => 'bool',
        'boolean' => 'bool',
        'string' => 'string',
        'int' => 'int',
        'integer' => 'int',
        'float' => 'float',
        'double' => 'float',
        'array' => 'array',
        'object' => 'object',
        'callable' => 'callable',
        'resource' => 'resource',
        'mixed' => 'mixed',
        'iterable' => 'iterable',
    ];

/** @var bool */
    private $ignorePhpDocErrors;

/**
     * @param bool $ignorePhpDocErrors Enable or disable throwing errors when PhpDoc errors occur (when parsing annotations).
     */
    public function __construct(bool $ignorePhpDocErrors = false)
    {
        $this->parser = new UseStatementParser;
        $this->ignorePhpDocErrors = $ignorePhpDocErrors;
    }

/**
     * Parse the docblock of the property to get the type (class or primitive type) of the var annotation.
     *
     * @return string|null Type of the property (content of var annotation)
     * @throws AnnotationException
     */
    public function getPropertyType(ReflectionProperty $property): ?string
    {
        return $this->readPropertyType($property, true);
    }

/**
     * Parse the docblock of the property to get the class of the var annotation.
     *
     * @return string|null Type of the property (content of var annotation)
     * @throws AnnotationException
     */
    public function getPropertyClass(ReflectionProperty $property): ?string
    {
        return $this->readPropertyType($property, false);
    }

private function readPropertyType(ReflectionProperty $property, bool $allowPrimitiveTypes): ?string
    {
        // Get the content of the @var annotation
        $docComment = $property->getDocComment();
        if (! $docComment) {
            return null;
        }
        if (preg_match('/@var\s+([^\s]+)/', $docComment, $matches)) {
            [, $type] = $matches;
        } else {
            return null;
        }

// Ignore primitive types
        if (isset(self::PRIMITIVE_TYPES[$type])) {
            if ($allowPrimitiveTypes) {
                return self::PRIMITIVE_TYPES[$type];
            }
            return null;
        }

// Ignore types containing special characters ([], <> ...)
        if (! preg_match('/^[a-zA-Z0-9\\\\_]+$/', $type)) {
            return null;
        }

$class = $property->getDeclaringClass();

// If the class name is not fully qualified (i.e. doesn't start with a \)
        if ($type[0] !== '\\') {
            // Try to resolve the FQN using the class context
            $resolvedType = $this->tryResolveFqn($type, $class, $property);

if (! $resolvedType && ! $this->ignorePhpDocErrors) {
                throw new AnnotationException(sprintf(
                    'The @var annotation on %s::%s contains a non existent class "%s". '
                        . 'Did you maybe forget to add a "use" statement for this annotation?',
                    $class->name,
                    $property->getName(),
                    $type
                ));
            }

$type = $resolvedType;
        }

if (! $this->ignorePhpDocErrors && ! $this->classExists($type)) {
            throw new AnnotationException(sprintf(
                'The @var annotation on %s::%s contains a non existent class "%s"',
                $class->name,
                $property->getName(),
                $type
            ));
        }

// Remove the leading \ (FQN shouldn't contain it)
        $type = is_string($type) ? ltrim($type, '\\') : null;

return $type;
    }

/**
     * Parse the docblock of the property to get the type (class or primitive type) of the param annotation.
     *
     * @return string|null Type of the property (content of var annotation)
     * @throws AnnotationException
     */
    public function getParameterType(ReflectionParameter $parameter): ?string
    {
        return $this->readParameterClass($parameter, true);
    }

/**
     * Parse the docblock of the property to get the class of the param annotation.
     *
     * @return string|null Type of the property (content of var annotation)
     * @throws AnnotationException
     */
    public function getParameterClass(ReflectionParameter $parameter): ?string
    {
        return $this->readParameterClass($parameter, false);
    }

private function readParameterClass(ReflectionParameter $parameter, bool $allowPrimitiveTypes): ?string
    {
        // Use reflection
        $parameterType = $parameter->getType();
        if ($parameterType && $parameterType instanceof \ReflectionNamedType && ! $parameterType->isBuiltin()) {
            return $parameterType->getName();
        }

$parameterName = $parameter->name;
        // Get the content of the @param annotation
        $method = $parameter->getDeclaringFunction();
        $docComment = $method->getDocComment();
        if (! $docComment) {
            return null;
        }
        if (preg_match('/@param\s+([^\s]+)\s+\$' . $parameterName . '/', $docComment, $matches)) {
            [, $type] = $matches;
        } else {
            return null;
        }

// Ignore types containing special characters ([], <> ...)
        if (! preg_match('/^[a-zA-Z0-9\\\\_]+$/', $type)) {
            return null;
        }

$class = $parameter->getDeclaringClass();

if (! $resolvedType && ! $this->ignorePhpDocErrors) {
                throw new AnnotationException(sprintf(
                    'The @param annotation for parameter "%s" of %s::%s contains a non existent class "%s". '
                        . 'Did you maybe forget to add a "use" statement for this annotation?',
                    $parameterName,
                    $class->name,
                    $method->name,
                    $type
                ));
            }

$type = $resolvedType;
        }

if (! $this->ignorePhpDocErrors && ! $this->classExists($type)) {
            throw new AnnotationException(sprintf(
                'The @param annotation for parameter "%s" of %s::%s contains a non existent class "%s"',
                $parameterName,
                $class->name,
                $method->name,
                $type
            ));
        }

// Remove the leading \ (FQN shouldn't contain it)
        $type = is_string($type) ? ltrim($type, '\\') : null;

return $type;
    }

/**
     * Attempts to resolve the FQN of the provided $type based on the $class and $member context.
     *
     * @return string|null Fully qualified name of the type, or null if it could not be resolved
     */
    private function tryResolveFqn(string $type, ReflectionClass $class, Reflector $member): ?string
    {
        $alias = ($pos = strpos($type, '\\')) === false ? $type : substr($type, 0, $pos);
        $loweredAlias = strtolower($alias);

// Retrieve "use" statements
        $uses = $this->parser->parseUseStatements($class);

if (isset($uses[$loweredAlias])) {
            // Imported classes
            if ($pos !== false) {
                return $uses[$loweredAlias] . substr($type, $pos);
            }
            return $uses[$loweredAlias];
        }

if ($this->classExists($class->getNamespaceName() . '\\' . $type)) {
            return $class->getNamespaceName() . '\\' . $type;
        }

if (isset($uses['__NAMESPACE__']) && $this->classExists($uses['__NAMESPACE__'] . '\\' . $type)) {
            // Class namespace
            return $uses['__NAMESPACE__'] . '\\' . $type;
        }

if ($this->classExists($type)) {
            // No namespace
            return $type;
        }

// If all fail, try resolving through related traits
        return $this->tryResolveFqnInTraits($type, $class, $member);
    }

/**
     * Attempts to resolve the FQN of the provided $type based on the $class and $member context, specifically searching
     * through the traits that are used by the provided $class.
     *
     * @return string|null Fully qualified name of the type, or null if it could not be resolved
     */
    private function tryResolveFqnInTraits(string $type, ReflectionClass $class, Reflector $member): ?string
    {
        /** @var ReflectionClass[] $traits */
        $traits = [];

// Get traits for the class and its parents
        while ($class) {
            $traits = array_merge($traits, $class->getTraits());
            $class = $class->getParentClass();
        }

foreach ($traits as $trait) {
            // Eliminate traits that don't have the property/method/parameter
            if ($member instanceof ReflectionProperty && ! $trait->hasProperty($member->name)) {
                continue;
            }
            if ($member instanceof ReflectionMethod && ! $trait->hasMethod($member->name)) {
                continue;
            }
            if ($member instanceof ReflectionParameter && ! $trait->hasMethod($member->getDeclaringFunction()->name)) {
                continue;
            }

// Run the resolver again with the ReflectionClass instance for the trait
            $resolvedType = $this->tryResolveFqn($type, $trait, $member);

if ($resolvedType) {
                return $resolvedType;
            }
        }

return null;
    }

private function classExists(string $class): bool
    {
        return class_exists($class) || interface_exists($class);
    }
}