<?php

declare(strict_types=1);

namespace App\Framework\Discovery\Exceptions;

use App\Framework\Exception\ErrorCode;
use App\Framework\Exception\ExceptionContext;
use App\Framework\Exception\FrameworkException;

/**
 * Base exception for Discovery system operations
 *
 * Provides specialized error handling for discovery-related
 * operations with appropriate error codes and recovery hints.
 */
final class DiscoveryException extends FrameworkException
{
    /**
     * Discovery process failed due to memory constraints
     */
    public static function memoryExhausted(string $operation, int $currentMemory, int $memoryLimit): self
    {
        $context = ExceptionContext::forOperation('discovery.memory_exhausted', 'DiscoveryService')
            ->withData([
                'operation' => $operation,
                'current_memory_mb' => round($currentMemory / 1024 / 1024, 2),
                'memory_limit_mb' => round($memoryLimit / 1024 / 1024, 2),
                'memory_usage_percent' => round(($currentMemory / $memoryLimit) * 100, 1),
            ])
            ->withDebug([
                'current_memory_bytes' => $currentMemory,
                'memory_limit_bytes' => $memoryLimit,
            ]);

        return self::fromContext(
            "Discovery operation '{$operation}' failed due to memory exhaustion",
            $context,
            ErrorCode::MEMORY_LIMIT_EXCEEDED
        )->withRetryAfter(300); // Suggest retry after 5 minutes
    }

    /**
     * Directory scanning failed
     */
    public static function scanFailed(string $directory, string $reason, ?\Throwable $previous = null): self
    {
        $context = ExceptionContext::forOperation('discovery.scan_failed', 'FileScanner')
            ->withData([
                'directory' => $directory,
                'reason' => $reason,
                'is_readable' => is_readable($directory),
                'exists' => file_exists($directory),
            ]);

        return self::fromContext(
            "Failed to scan directory '{$directory}': {$reason}",
            $context,
            ErrorCode::FILESYSTEM_READ_ERROR,
            $previous
        );
    }

    /**
     * Cache operation failed
     */
    public static function cacheFailed(string $operation, string $key, ?\Throwable $previous = null): self
    {
        $context = ExceptionContext::forOperation('discovery.cache_failed', 'DiscoveryCacheManager')
            ->withData([
                'cache_operation' => $operation,
                'cache_key' => $key,
            ])
            ->withDebug([
                'key_hash' => md5($key),
                'operation_timestamp' => time(),
            ]);

        return self::fromContext(
            "Discovery cache operation '{$operation}' failed for key '{$key}'",
            $context,
            ErrorCode::CACHE_OPERATION_FAILED,
            $previous
        );
    }

    /**
     * File processing failed
     */
    public static function fileProcessingFailed(string $file, string $reason, ?\Throwable $previous = null): self
    {
        $context = ExceptionContext::forOperation('discovery.file_processing_failed', 'FileProcessor')
            ->withData([
                'file_path' => $file,
                'file_size' => file_exists($file) ? filesize($file) : null,
                'file_extension' => pathinfo($file, PATHINFO_EXTENSION),
                'reason' => $reason,
            ]);

        return self::fromContext(
            "Failed to process file '{$file}': {$reason}",
            $context,
            ErrorCode::FILE_PROCESSING_FAILED,
            $previous
        );
    }

    /**
     * Attribute reflection failed
     */
    public static function attributeReflectionFailed(string $className, string $attributeType, ?\Throwable $previous = null): self
    {
        $context = ExceptionContext::forOperation('discovery.attribute_reflection_failed', 'AttributeProcessor')
            ->withData([
                'class_name' => $className,
                'attribute_type' => $attributeType,
                'class_exists' => class_exists($className),
            ]);

        return self::fromContext(
            "Failed to reflect attribute '{$attributeType}' on class '{$className}'",
            $context,
            ErrorCode::REFLECTION_FAILED,
            $previous
        );
    }

    /**
     * Memory guard emergency stop
     */
    public static function emergencyStop(string $reason, array $memoryStats): self
    {
        $context = ExceptionContext::forOperation('discovery.emergency_stop', 'MemoryGuard')
            ->withData([
                'reason' => $reason,
                'memory_usage_mb' => round($memoryStats['current_usage'] / 1024 / 1024, 2),
                'memory_limit_mb' => round($memoryStats['memory_limit'] / 1024 / 1024, 2),
                'memory_pressure' => $memoryStats['memory_pressure'] ?? 'unknown',
            ])
            ->withDebug($memoryStats);

        return self::fromContext(
            "Discovery process stopped by memory guard: {$reason}",
            $context,
            ErrorCode::EMERGENCY_STOP_TRIGGERED
        );
    }

    /**
     * Configuration validation failed
     */
    public static function configurationInvalid(string $field, string $reason): self
    {
        $context = ExceptionContext::forOperation('discovery.configuration_invalid', 'DiscoveryConfiguration')
            ->withData([
                'invalid_field' => $field,
                'validation_error' => $reason,
            ]);

        return self::fromContext(
            "Discovery configuration invalid - {$field}: {$reason}",
            $context,
            ErrorCode::VAL_CONFIGURATION_INVALID
        );
    }

    /**
     * Discovery timeout
     */
    public static function timeout(int $timeoutSeconds, int $actualSeconds): self
    {
        $context = ExceptionContext::forOperation('discovery.timeout', 'DiscoveryService')
            ->withData([
                'timeout_seconds' => $timeoutSeconds,
                'actual_seconds' => $actualSeconds,
                'exceeded_by_seconds' => $actualSeconds - $timeoutSeconds,
            ]);

        return self::fromContext(
            "Discovery operation timed out after {$actualSeconds}s (limit: {$timeoutSeconds}s)",
            $context,
            ErrorCode::OPERATION_TIMEOUT
        )->withRetryAfter(60); // Suggest retry after 1 minute
    }

    /**
     * Concurrent discovery conflict
     */
    public static function concurrentDiscovery(string $lockId): self
    {
        $context = ExceptionContext::forOperation('discovery.concurrent_conflict', 'DiscoveryService')
            ->withData([
                'lock_id' => $lockId,
                'conflict_type' => 'concurrent_discovery',
            ]);

        return self::fromContext(
            "Discovery already in progress (lock: {$lockId})",
            $context,
            ErrorCode::RESOURCE_CONFLICT
        )->withRetryAfter(30); // Suggest retry after 30 seconds
    }

    /**
     * Corrupted discovery data
     */
    public static function corruptedData(string $source, string $reason): self
    {
        $context = ExceptionContext::forOperation('discovery.corrupted_data', 'DiscoveryService')
            ->withData([
                'data_source' => $source,
                'corruption_reason' => $reason,
            ]);

        return self::fromContext(
            "Discovery data corrupted in {$source}: {$reason}",
            $context,
            ErrorCode::DATA_CORRUPTION_DETECTED
        );
    }

    /**
     * Insufficient permissions
     */
    public static function insufficientPermissions(string $path, string $requiredPermission): self
    {
        $context = ExceptionContext::forOperation('discovery.insufficient_permissions', 'FileScanner')
            ->withData([
                'path' => $path,
                'required_permission' => $requiredPermission,
                'current_permissions' => file_exists($path) ? substr(sprintf('%o', fileperms($path)), -4) : null,
            ]);

        return self::fromContext(
            "Insufficient permissions to access '{$path}' (required: {$requiredPermission})",
            $context,
            ErrorCode::PERMISSION_DENIED
        );
    }

    /**
     * Resource limit exceeded
     */
    public static function resourceLimitExceeded(string $resource, int $current, int $limit): self
    {
        $context = ExceptionContext::forOperation('discovery.resource_limit_exceeded', 'DiscoveryService')
            ->withData([
                'resource_type' => $resource,
                'current_usage' => $current,
                'resource_limit' => $limit,
                'usage_percentage' => round(($current / $limit) * 100, 1),
            ]);

        return self::fromContext(
            "Resource limit exceeded for {$resource}: {$current}/{$limit}",
            $context,
            ErrorCode::RESOURCE_LIMIT_EXCEEDED
        )->withRetryAfter(60);
    }

    /**
     * Dependency missing
     */
    public static function dependencyMissing(string $dependency, string $requiredFor): self
    {
        $context = ExceptionContext::forOperation('discovery.dependency_missing', 'DiscoveryService')
            ->withData([
                'missing_dependency' => $dependency,
                'required_for' => $requiredFor,
            ]);

        return self::fromContext(
            "Missing dependency '{$dependency}' required for {$requiredFor}",
            $context,
            ErrorCode::DEPENDENCY_MISSING
        );
    }
}