<?php

declare(strict_types=1);

namespace App\Framework\Discovery\Processing;

use App\Framework\Core\ValueObjects\ClassName;
use App\Framework\Discovery\ValueObjects\FileContext;
use App\Framework\Filesystem\File;
use App\Framework\Reflection\ReflectionProvider;
use App\Framework\Reflection\WrappedReflectionClass;

/**
 * Shared context for processing files during discovery
 *
 * This context holds reflection instances and other shared data
 * to avoid duplicate work between visitors
 */
final class ProcessingContext
{
    private ?WrappedReflectionClass $currentReflection = null;

    private ?ClassName $currentClassName = null;

    private ?FileContext $currentFileContext = null;

    public function __construct(
        private readonly ReflectionProvider $reflectionProvider
    ) {
    }

    /**
     * Set the current file being processed
     */
    public function setCurrentFile(FileContext $fileContext): void
    {
        $this->currentFileContext = $fileContext;
        // Clear reflection cache when switching files
        $this->currentReflection = null;
        $this->currentClassName = null;
    }

    /**
     * Get reflection for a class (cached within the same file)
     */
    public function getReflection(ClassName $className): ?WrappedReflectionClass
    {
        // Return cached reflection if it's for the same class
        if ($this->currentClassName !== null &&
            $this->currentClassName->equals($className) &&
            $this->currentReflection !== null) {
            return $this->currentReflection;
        }

        // Clear previous reflection
        if ($this->currentClassName !== null) {
            $this->reflectionProvider->forget($this->currentClassName);
        }

        // Get new reflection
        try {
            // IMPORTANT: Skip exists() check completely - it would trigger autoloading
            // which could fail if constructor dependencies aren't available yet.
            // Instead, directly try to get reflection and catch any errors.
            $this->currentReflection = $this->reflectionProvider->getClass($className);
            $this->currentClassName = $className;

            return $this->currentReflection;
        } catch (\Throwable) {
            // Class can't be reflected (missing, parse error, autoload failure, etc.)
            // This is fine during discovery - we skip it and continue
        }

        return null;
    }

    /**
     * Get the current file context
     */
    public function getCurrentFileContext(): ?FileContext
    {
        return $this->currentFileContext;
    }

    /**
     * Clean up resources for the current file
     */
    public function cleanup(): void
    {
        if ($this->currentClassName !== null) {
            $this->reflectionProvider->forget($this->currentClassName);
        }

        $this->currentReflection = null;
        $this->currentClassName = null;
        $this->currentFileContext = null;
    }

    /**
     * Force garbage collection if needed
     */
    public function maybeCollectGarbage(int $processedFiles): void
    {
        if ($processedFiles % 50 === 0) {
            gc_collect_cycles();

            // Clear reflection cache less frequently
            if ($processedFiles % 100 === 0) {
                $this->reflectionProvider->flush();
            }
        }
    }

    /**
     * Clear all caches for memory management
     */
    public function clearCaches(): void
    {
        if ($this->currentClassName !== null) {
            $this->reflectionProvider->forget($this->currentClassName);
        }

        // Flush the entire reflection provider cache
        $this->reflectionProvider->flush();

        $this->currentReflection = null;
        $this->currentClassName = null;
        $this->currentFileContext = null;

        // Force garbage collection
        gc_collect_cycles();
    }
}