<?php

declare(strict_types=1);

namespace App\Framework\Discovery\Processing;

use App\Framework\Core\AttributeMapper;
use App\Framework\Core\ValueObjects\ClassName;
use App\Framework\Core\ValueObjects\MethodName;
use App\Framework\Discovery\DiscoveryDataCollector;
use App\Framework\Discovery\ValueObjects\AttributeTarget;
use App\Framework\Discovery\ValueObjects\DiscoveredAttribute;
use App\Framework\Discovery\ValueObjects\FileContext;
use App\Framework\Discovery\ValueObjects\TemplateMapping;
use App\Framework\Filesystem\File;
use App\Framework\Http\Method;
use App\Framework\Logging\Logger;

/**
 * Coordinates visitor execution with shared reflection context
 *
 * This replaces the duplicate visitor logic in UnifiedDiscoveryService
 */
final class VisitorCoordinator
{
    /** @var array<string, AttributeMapper> */
    private array $mapperMap;

    /** @var array<string> */
    private array $ignoredAttributes = [
        'Attribute', 'Override', 'AllowDynamicProperties',
        'ReturnTypeWillChange', 'SensitiveParameter',
    ];

    public function __construct(
        private readonly ProcessingContext $processingContext,
        private readonly array             $attributeMappers = [],
        private readonly array             $targetInterfaces = [],
        private ?Logger                    $logger = null
    ) {
        // Build mapper map for quick lookup
        $mapperMap = [];
        foreach ($this->attributeMappers as $mapper) {
            $mapperMap[$mapper->getAttributeClass()] = $mapper;
        }
        $this->mapperMap = $mapperMap;
    }

    /**
     * Process a file with all discovery logic
     */
    public function processFile(
        File $file,
        FileContext $fileContext,
        DiscoveryDataCollector $collector
    ): void {
        // Process each class in the file
        foreach ($fileContext->getClassNames() as $className) {
            $this->processClass($className, $fileContext, $collector);
        }

        // Process templates (file-based)
        $this->processTemplates($file, $collector);
    }

    /**
     * Process a single class
     */
    private function processClass(
        ClassName $className,
        FileContext $fileContext,
        DiscoveryDataCollector $collector
    ): void {
        // Get shared reflection instance
        $reflection = $this->processingContext->getReflection($className);
        if ($reflection === null) {
            return;
        }

        // Process attributes
        $this->processClassAttributes($className, $fileContext, $reflection, $collector);
        $this->processMethodAttributes($className, $fileContext, $reflection, $collector);

        // Process interface implementations
        if (! empty($this->targetInterfaces)) {
            $this->processInterfaces($className, $reflection, $collector);
        }
    }

    /**
     * Process class-level attributes
     */
    private function processClassAttributes(
        ClassName $className,
        FileContext $fileContext,
        $reflection,
        DiscoveryDataCollector $collector
    ): void {
        foreach ($reflection->getAttributes() as $attribute) {
            $attributeClass = $attribute->getName();

            if ($this->shouldIgnoreAttribute($attributeClass)) {
                continue;
            }

            $mappedData = $this->applyMapper($attributeClass, $reflection, $attribute);

            $discovered = new DiscoveredAttribute(
                className: $className,
                attributeClass: $attributeClass,
                target: AttributeTarget::TARGET_CLASS,
                methodName: null,
                propertyName: null,
                arguments: $this->extractAttributeArguments($attribute),
                filePath: $fileContext->path,
                additionalData: $mappedData ?? []
            );

            $collector->getAttributeRegistry()->add($attributeClass, $discovered);
        }
    }

    /**
     * Process method-level attributes
     */
    private function processMethodAttributes(
        ClassName $className,
        FileContext $fileContext,
        $reflection,
        DiscoveryDataCollector $collector
    ): void {
        foreach ($reflection->getMethods() as $method) {
            foreach ($method->getAttributes() as $attribute) {
                $attributeClass = $attribute->getName();

                if ($this->shouldIgnoreAttribute($attributeClass)) {
                    continue;
                }


                $mappedData = $this->applyMapper($attributeClass, $method, $attribute);

                $discovered = new DiscoveredAttribute(
                    className: $className,
                    attributeClass: $attributeClass,
                    target: AttributeTarget::METHOD,
                    methodName: MethodName::create($method->getName()),
                    propertyName: null,
                    arguments: $this->extractAttributeArguments($attribute),
                    filePath: $fileContext->path,
                    additionalData: $mappedData ?? []
                );

                $collector->getAttributeRegistry()->add($attributeClass, $discovered);
            }
        }
    }

    /**
     * Process interface implementations
     */
    private function processInterfaces(
        ClassName $className,
        $reflection,
        DiscoveryDataCollector $collector
    ): void {
        foreach ($this->targetInterfaces as $targetInterface) {
            if ($reflection->implementsInterface($targetInterface)) {
                $collector->getInterfaceRegistry()->add(
                    $targetInterface,
                    $className->getFullyQualified()
                );
            }
        }
    }

    /**
     * Process templates
     */
    private function processTemplates(File $file, DiscoveryDataCollector $collector): void
    {
        $filePath = $file->getPath()->toString();

        if (str_ends_with($filePath, '.view.php') || str_contains($filePath, '/views/')) {
            $templateName = basename($filePath, '.php');
            $mapping = TemplateMapping::create($templateName, $filePath);
            $collector->getTemplateRegistry()->add($mapping);
        }
    }

    /**
     * Apply attribute mapper if available
     */
    private function applyMapper(string $attributeClass, $reflectionElement, $attribute): ?array
    {
        if (! isset($this->mapperMap[$attributeClass])) {
            return $this->tryDefaultMapper($attributeClass, $reflectionElement, $attribute);
        }

        try {
            $mapper = $this->mapperMap[$attributeClass];
            $attributeInstance = $attribute->newInstance();

            return $mapper->map($reflectionElement, $attributeInstance);
        } catch (\Throwable) {
            return null;
        }
    }

    /**
     * Try to use a default mapper for common attributes
     */
    private function tryDefaultMapper(string $attributeClass, $reflectionElement, $attribute): ?array
    {
        $defaultMapper = match ($attributeClass) {
            'App\Framework\Attributes\Route' => new \App\Framework\Core\RouteMapper(),
            'App\Framework\Core\Events\OnEvent' => new \App\Framework\Core\Events\EventHandlerMapper(),
            'App\Framework\CommandBus\CommandHandler' => new \App\Framework\CommandBus\CommandHandlerMapper(),
            'App\Framework\QueryBus\QueryHandler' => new \App\Framework\QueryBus\QueryHandlerMapper(),
            'App\Framework\DI\Initializer' => new \App\Framework\DI\InitializerMapper(),
            default => null,
        };

        if ($defaultMapper === null) {
            return null;
        }

        try {
            $attributeInstance = $attribute->newInstance();

            return $defaultMapper->map($reflectionElement, $attributeInstance);
        } catch (\Throwable) {
            return null;
        }
    }

    /**
     * Extract and normalize attribute arguments
     */
    private function extractAttributeArguments($attribute): array
    {
        try {
            $arguments = $attribute->getArguments();
            $normalizedArgs = [];

            $reflection = new \ReflectionClass($attribute->getName());
            $constructor = $reflection->getConstructor();

            if ($constructor) {
                $parameters = $constructor->getParameters();
                foreach ($arguments as $key => $value) {
                    if (is_int($key) && isset($parameters[$key])) {
                        $normalizedArgs[$parameters[$key]->getName()] = $value;
                    } else {
                        $normalizedArgs[$key] = $value;
                    }
                }
            } else {
                $normalizedArgs = $arguments;
            }

            return $normalizedArgs;
        } catch (\Throwable) {
            return [];
        }
    }

    /**
     * Check if an attribute should be ignored
     */
    private function shouldIgnoreAttribute(string $attributeName): bool
    {
        if (in_array($attributeName, $this->ignoredAttributes, true)) {
            return true;
        }

        $shortName = substr($attributeName, strrpos($attributeName, '\\') + 1);

        return in_array($shortName, $this->ignoredAttributes, true);
    }
}