<?php

namespace App\Console\Commands;

use Illuminate\Console\Command;
use Illuminate\Support\Facades\File;
use ReflectionClass;

class UpdateLogicalRelationships extends Command
{
    protected $signature = 'db:update-relationships';
    protected $description = '모델에서 논리적 관계를 추출하여 문서 업데이트';

    public function handle()
    {
        $this->info('🔄 논리적 관계 문서 업데이트 시작...');

        $relationships = $this->extractModelRelationships();
        $this->updateLogicalDocument($relationships);

        $this->info('✅ 논리적 관계 문서 업데이트 완료!');
    }

    private function extractModelRelationships(): array
    {
        $relationships = [];
        $modelPath = app_path('Models');

        // 모든 모델 파일 스캔
        $modelFiles = File::allFiles($modelPath);

        foreach ($modelFiles as $file) {
            if ($file->getExtension() !== 'php') continue;

            $className = $this->getClassNameFromFile($file);
            if (!$className || !class_exists($className)) continue;

            try {
                $reflection = new ReflectionClass($className);

                // 모델이 Eloquent Model인지 확인
                if (!$reflection->isSubclassOf(\Illuminate\Database\Eloquent\Model::class)) {
                    continue;
                }

                // Abstract 클래스 건너뛰기
                if ($reflection->isAbstract()) {
                    continue;
                }

                // 테이블 이름 직접 추출
                $tableName = $this->getTableNameFromModel($className, $reflection);
                if (!$tableName) continue;

                $relationships[$tableName] = [
                    'model' => $className,
                    'relationships' => $this->getModelRelationshipsFromFile($file, $className)
                ];

            } catch (\Exception $e) {
                $this->warn("모델 분석 실패: {$className} - " . $e->getMessage());
                continue;
            }
        }

        return $relationships;
    }

    private function getTableNameFromModel(string $className, ReflectionClass $reflection): ?string
    {
        // 클래스명에서 테이블명 추정
        $modelName = class_basename($className);
        $tableName = strtolower(preg_replace('/(?<!^)[A-Z]/', '_$0', $modelName));

        // 복수형으로 변환 (간단한 규칙)
        if (!str_ends_with($tableName, 's')) {
            $tableName .= 's';
        }

        return $tableName;
    }

    private function getModelRelationshipsFromFile($file, string $className): array
    {
        $content = File::get($file->getRealPath());
        $relationships = [];

        // 관계 메서드 패턴 검출
        $patterns = [
            'belongsTo' => '/public\s+function\s+(\w+)\s*\([^)]*\)\s*[^{]*{\s*return\s+\$this->belongsTo\s*\(\s*([^,\)]+)/',
            'hasMany' => '/public\s+function\s+(\w+)\s*\([^)]*\)\s*[^{]*{\s*return\s+\$this->hasMany\s*\(\s*([^,\)]+)/',
            'hasOne' => '/public\s+function\s+(\w+)\s*\([^)]*\)\s*[^{]*{\s*return\s+\$this->hasOne\s*\(\s*([^,\)]+)/',
            'belongsToMany' => '/public\s+function\s+(\w+)\s*\([^)]*\)\s*[^{]*{\s*return\s+\$this->belongsToMany\s*\(\s*([^,\)]+)/',
        ];

        foreach ($patterns as $type => $pattern) {
            if (preg_match_all($pattern, $content, $matches, PREG_SET_ORDER)) {
                foreach ($matches as $match) {
                    $relationships[] = [
                        'method' => $match[1],
                        'type' => $type,
                        'related_model' => trim($match[2], '"\''),
                        'foreign_key' => null,
                        'local_key' => null
                    ];
                }
            }
        }

        return $relationships;
    }

    private function getModelRelationships(ReflectionClass $reflection, $model): array
    {
        $relationships = [];
        $methods = $reflection->getMethods(\ReflectionMethod::IS_PUBLIC);

        foreach ($methods as $method) {
            if ($method->getDeclaringClass()->getName() !== $reflection->getName()) {
                continue;
            }

            try {
                // 관계 메서드 호출해서 타입 확인
                $result = $method->invoke($model);

                if ($this->isRelationshipMethod($result)) {
                    $relationships[] = [
                        'method' => $method->getName(),
                        'type' => $this->getRelationshipType($result),
                        'related_model' => get_class($result->getRelated()),
                        'foreign_key' => $this->getForeignKey($result),
                        'local_key' => $this->getLocalKey($result)
                    ];
                }
            } catch (\Exception $e) {
                // 관계 메서드가 아니거나 호출 실패 시 건너뛰기
                continue;
            }
        }

        return $relationships;
    }

    private function isRelationshipMethod($result): bool
    {
        return $result instanceof \Illuminate\Database\Eloquent\Relations\Relation;
    }

    private function getRelationshipType($relation): string
    {
        $className = get_class($relation);
        return class_basename($className);
    }

    private function getForeignKey($relation): ?string
    {
        return method_exists($relation, 'getForeignKeyName')
            ? $relation->getForeignKeyName()
            : null;
    }

    private function getLocalKey($relation): ?string
    {
        return method_exists($relation, 'getLocalKeyName')
            ? $relation->getLocalKeyName()
            : null;
    }

    private function getClassNameFromFile($file): ?string
    {
        $content = File::get($file->getRealPath());

        if (!preg_match('/namespace\s+([^;]+);/', $content, $namespaceMatches)) {
            return null;
        }

        if (!preg_match('/class\s+(\w+)/', $content, $classMatches)) {
            return null;
        }

        return $namespaceMatches[1] . '\\' . $classMatches[1];
    }

    private function updateLogicalDocument(array $relationships): void
    {
        $documentPath = base_path('LOGICAL_RELATIONSHIPS.md');
        $timestamp = now()->format('Y-m-d H:i:s');

        $content = "# 논리적 데이터베이스 관계 문서\n\n";
        $content .= "> **자동 생성**: {$timestamp}\n";
        $content .= "> **소스**: Eloquent 모델 관계 분석\n\n";

        $content .= "## 📊 모델별 관계 현황\n\n";

        foreach ($relationships as $tableName => $info) {
            if (empty($info['relationships'])) continue;

            $content .= "### {$tableName}\n";
            $content .= "**모델**: `{$info['model']}`\n\n";

            foreach ($info['relationships'] as $rel) {
                $relatedTable = (new $rel['related_model'])->getTable();
                $content .= "- **{$rel['method']}()**: {$rel['type']} → `{$relatedTable}`";

                if ($rel['foreign_key']) {
                    $content .= " (FK: `{$rel['foreign_key']}`)";
                }

                $content .= "\n";
            }

            $content .= "\n";
        }

        File::put($documentPath, $content);
        $this->info("📄 문서 업데이트: {$documentPath}");
    }
}