<?php
declare(strict_types=1);

namespace Fendx\CLI\Generator;

class ModelGenerator extends CodeGenerator
{
    protected function loadTemplates(): void
    {
        $this->templates = [
            'model' => $this->getModelTemplate(),
            'property' => $this->getPropertyTemplate(),
            'method' => $this->getMethodTemplate(),
            'migration' => $this->getMigrationTemplate(),
            'factory' => $this->getFactoryTemplate(),
            'seeder' => $this->getSeederTemplate()
        ];
    }

    public function generate(string $name, array $options = []): bool
    {
        if (!$this->validateName($name)) {
            return false;
        }

        $className = $this->getClassName($name);
        $tableName = $options['table'] ?? $this->getTableName($name);
        $fields = $options['fields'] ?? [];
        $timestamps = $options['timestamps'] ?? true;
        $softDeletes = $options['soft_deletes'] ?? false;
        $relationships = $options['relationships'] ?? [];
        $generateMigration = $options['migration'] ?? true;
        $generateFactory = $options['factory'] ?? false;
        $generateSeeder = $options['seeder'] ?? false;

        if (!empty($fields)) {
            if (is_string($fields)) {
                $fields = $this->parseFields($fields);
            }
        }

        // 生成模型
        $modelContent = $this->generateModel($className, $tableName, $fields, $timestamps, $softDeletes, $relationships);
        $modelPath = $this->getNamespacePath('Model');
        $modelFilePath = $modelPath . '/' . $className . '.php';

        if (!$this->createFile($modelFilePath, $modelContent)) {
            return false;
        }

        // 生成迁移文件
        if ($generateMigration) {
            $this->generateMigration($className, $tableName, $fields, $timestamps, $softDeletes);
        }

        // 生成工厂文件
        if ($generateFactory) {
            $this->generateFactory($className, $fields);
        }

        // 生成种子文件
        if ($generateSeeder) {
            $this->generateSeeder($className);
        }

        $this->showMessage('success', "Model '{$className}' generated successfully!");

        return true;
    }

    private function generateModel(string $className, string $tableName, array $fields, bool $timestamps, bool $softDeletes, array $relationships): string
    {
        $useStatements = [];
        $properties = '';
        $methods = '';

        // 基础use语句
        $useStatements[] = 'use Fendx\\ORM\\Model;';

        if ($softDeletes) {
            $useStatements[] = 'use Fendx\\ORM\\Traits\\SoftDeletes;';
        }

        // 生成属性
        foreach ($fields as $field) {
            $properties .= $this->generateProperty($field);
        }

        // 生成关系方法
        foreach ($relationships as $relationship) {
            $methods .= $this->generateRelationshipMethod($relationship);
        }

        // 生成访问器和修改器
        foreach ($fields as $field) {
            $methods .= $this->generateAccessorMutator($field);
        }

        $useBlock = implode("\n", array_unique($useStatements)) . "\n\n";

        return $this->renderTemplate('model', [
            'namespace' => $this->getFullNamespace('Model'),
            'use_block' => $useBlock,
            'class_name' => $className,
            'table_name' => $tableName,
            'timestamps' => $timestamps ? 'true' : 'false',
            'soft_deletes' => $softDeletes ? 'use SoftDeletes;' : '',
            'properties' => $properties,
            'methods' => $methods
        ]);
    }

    private function generateProperty(array $field): string
    {
        $name = $field['name'];
        $type = $this->getPhpType($field['type']);
        $nullable = isset($field['options']['nullable']);

        $docBlock = $this->generatePropertyDocBlock($field);
        
        return $this->renderTemplate('property', [
            'doc_block' => $docBlock,
            'property_name' => $name,
            'property_type' => $type,
            'nullable' => $nullable ? '?' : ''
        ]);
    }

    private function generatePropertyDocBlock(array $field): string
    {
        $type = $this->getPhpType($field['type']);
        $comment = '';

        if (isset($field['options']['unique'])) {
            $comment .= ' (unique)';
        }
        if (isset($field['options']['default'])) {
            $comment .= ' (default: ' . $field['options']['default'] . ')';
        }
        if (isset($field['options']['nullable'])) {
            $comment .= ' (nullable)';
        }

        return "/**\n * @var {$type}{$comment}\n */";
    }

    private function generateRelationshipMethod(array $relationship): string
    {
        $type = $relationship['type'];
        $relatedModel = $relationship['model'];
        $foreignKey = $relationship['foreign_key'] ?? null;
        $localKey = $relationship['local_key'] ?? null;

        switch ($type) {
            case 'hasOne':
                return $this->generateHasOneMethod($relatedModel, $foreignKey, $localKey);
            case 'hasMany':
                return $this->generateHasManyMethod($relatedModel, $foreignKey, $localKey);
            case 'belongsTo':
                return $this->generateBelongsToMethod($relatedModel, $foreignKey, $localKey);
            case 'belongsToMany':
                return $this->generateBelongsToManyMethod($relatedModel, $foreignKey, $localKey);
            default:
                return '';
        }
    }

    private function generateHasOneMethod(string $relatedModel, ?string $foreignKey, ?string $localKey): string
    {
        $methodName = $this->getVariableName($relatedModel);
        $params = '';

        if ($foreignKey) {
            $params .= ", '{$foreignKey}'";
        }
        if ($localKey) {
            $params .= ", '{$localKey}'";
        }

        return <<<PHP
    /**
     * Get the associated {$relatedModel}.
     */
    public function {$methodName}(): HasOne
    {
        return \$this->hasOne({$relatedModel}::class{$params});
    }

PHP;
    }

    private function generateHasManyMethod(string $relatedModel, ?string $foreignKey, ?string $localKey): string
    {
        $methodName = $this->getPluralName($this->getVariableName($relatedModel));
        $params = '';

        if ($foreignKey) {
            $params .= ", '{$foreignKey}'";
        }
        if ($localKey) {
            $params .= ", '{$localKey}'";
        }

        return <<<PHP
    /**
     * Get the associated {$relatedModel} records.
     */
    public function {$methodName}(): HasMany
    {
        return \$this->hasMany({$relatedModel}::class{$params});
    }

PHP;
    }

    private function generateBelongsToMethod(string $relatedModel, ?string $foreignKey, ?string $localKey): string
    {
        $methodName = $this->getVariableName($relatedModel);
        $params = '';

        if ($foreignKey) {
            $params .= ", '{$foreignKey}'";
        }
        if ($localKey) {
            $params .= ", '{$localKey}'";
        }

        return <<<PHP
    /**
     * Get the associated {$relatedModel}.
     */
    public function {$methodName}(): BelongsTo
    {
        return \$this->belongsTo({$relatedModel}::class{$params});
    }

PHP;
    }

    private function generateBelongsToManyMethod(string $relatedModel, ?string $foreignKey, ?string $localKey): string
    {
        $methodName = $this->getPluralName($this->getVariableName($relatedModel));
        $params = '';

        if ($foreignKey) {
            $params .= ", '{$foreignKey}'";
        }
        if ($localKey) {
            $params .= ", '{$localKey}'";
        }

        return <<<PHP
    /**
     * Get the associated {$relatedModel} records.
     */
    public function {$methodName}(): BelongsToMany
    {
        return \$this->belongsToMany({$relatedModel}::class{$params});
    }

PHP;
    }

    private function generateAccessorMutator(array $field): string
    {
        $name = $field['name'];
        $type = $this->getPhpType($field['type']);
        $methods = '';

        // 生成访问器
        $accessorName = 'get' . $this->getClassName($name) . 'Attribute';
        $methods .= <<<PHP
    /**
     * Get the {$name} attribute.
     */
    public function {$accessorName}(): {$type}
    {
        return \$this->attributes['{$name}'];
    }

PHP;

        // 生成修改器
        $mutatorName = 'set' . $this->getClassName($name) . 'Attribute';
        $methods .= <<<PHP
    /**
     * Set the {$name} attribute.
     */
    public function {$mutatorName}({$type} \$value): void
    {
        \$this->attributes['{$name}'] = \$value;
    }

PHP;

        return $methods;
    }

    private function generateMigration(string $className, string $tableName, array $fields, bool $timestamps, bool $softDeletes): void
    {
        $migrationName = 'create_' . $tableName . '_table';
        $migrationClassName = $this->getClassName($migrationName);
        
        $content = $this->generateMigrationContent($migrationClassName, $tableName, $fields, $timestamps, $softDeletes);
        
        $migrationPath = $this->getNamespacePath('../database/migrations');
        $timestamp = date('Y_m_d_His');
        $filename = $timestamp . '_' . $migrationName . '.php';
        $filePath = $migrationPath . '/' . $filename;

        $this->createFile($filePath, $content);
    }

    private function generateMigrationContent(string $className, string $tableName, array $fields, bool $timestamps, bool $softDeletes): string
    {
        $upMethods = '';
        $downMethods = '';

        // 生成字段定义
        foreach ($fields as $field) {
            $upMethods .= $this->generateMigrationField($field);
        }

        // 生成时间戳
        if ($timestamps) {
            $upMethods .= "            \$table->timestamps();\n";
            $downMethods .= "            \$table->dropTimestamps();\n";
        }

        // 生成软删除
        if ($softDeletes) {
            $upMethods .= "            \$table->softDeletes();\n";
            $downMethods .= "            \$table->dropSoftDeletes();\n";
        }

        return $this->renderTemplate('migration', [
            'class_name' => $className,
            'table_name' => $tableName,
            'up_methods' => $upMethods,
            'down_methods' => $downMethods
        ]);
    }

    private function generateMigrationField(array $field): string
    {
        $name = $field['name'];
        $type = $field['type'];
        $options = $field['options'] ?? [];

        $method = "\$table->{$type}('{$name}')";

        if (isset($options['nullable'])) {
            $method .= '->nullable()';
        }

        if (isset($options['default'])) {
            $default = $options['default'];
            if (is_string($default)) {
                $default = "'{$default}'";
            }
            $method .= "->default({$default})";
        }

        if (isset($options['unique'])) {
            $method .= '->unique()';
        }

        return "            {$method};\n";
    }

    private function generateFactory(string $className, array $fields): void
    {
        $factoryClassName = $className . 'Factory';
        $definition = $this->generateFactoryDefinition($className, $fields);
        
        $content = $this->renderTemplate('factory', [
            'namespace' => $this->getFullNamespace('Database\\Factories'),
            'class_name' => $factoryClassName,
            'model_class' => $className,
            'definition' => $definition
        ]);

        $factoryPath = $this->getNamespacePath('../database/factories');
        $filePath = $factoryPath . '/' . $factoryClassName . '.php';

        $this->createFile($filePath, $content);
    }

    private function generateFactoryDefinition(string $className, array $fields): string
    {
        $definition = '';

        foreach ($fields as $field) {
            $name = $field['name'];
            $type = $field['type'];
            $faker = $this->getFakerMethod($type, $field['options'] ?? []);

            $definition .= "            '{$name}' => {$faker},\n";
        }

        return $definition;
    }

    private function getFakerMethod(string $type, array $options): string
    {
        $fakerMap = [
            'string' => '$this->faker->sentence()',
            'varchar' => '$this->faker->word()',
            'text' => '$this->faker->paragraph()',
            'int' => '$this->faker->numberBetween(1, 1000)',
            'integer' => '$this->faker->numberBetween(1, 1000)',
            'bigint' => '$this->faker->numberBetween(1, 1000000)',
            'float' => '$this->faker->randomFloat(2, 0, 1000)',
            'double' => '$this->faker->randomFloat(2, 0, 1000)',
            'bool' => '$this->faker->boolean()',
            'boolean' => '$this->faker->boolean()',
            'date' => '$this->faker->date()',
            'datetime' => '$this->faker->datetime()',
            'timestamp' => '$this->faker->datetime()',
            'email' => '$this->faker->email()',
            'url' => '$this->faker->url()'
        ];

        return $fakerMap[$type] ?? '$this->faker->word()';
    }

    private function generateSeeder(string $className): void
    {
        $seederClassName = $className . 'Seeder';
        $modelVariable = $this->getVariableName($className);
        
        $content = $this->renderTemplate('seeder', [
            'namespace' => $this->getFullNamespace('Database\\Seeders'),
            'class_name' => $seederClassName,
            'model_class' => $className,
            'model_variable' => $modelVariable,
            'model_namespace' => $this->getFullNamespace('Model')
        ]);

        $seederPath = $this->getNamespacePath('../database/seeders');
        $filePath = $seederPath . '/' . $seederClassName . '.php';

        $this->createFile($filePath, $content);
    }

    private function getModelTemplate(): string
    {
        return <<<PHP
<?php
declare(strict_types=1);

namespace {{namespace}};

{{use_block}}class {{class_name}} extends Model
{
    protected string \$table = '{{table_name}}';
    protected bool \$timestamps = {{timestamps}};
    {{soft_deletes}}

{{properties}}
{{methods}}
}
PHP;
    }

    private function getPropertyTemplate(): string
    {
        return <<<PHP
    {{doc_block}}
    private {{nullable}}{{property_type}} \${{property_name}};

PHP;
    }

    private function getMethodTemplate(): string
    {
        return <<<PHP
    {{method_content}}

PHP;
    }

    private function getMigrationTemplate(): string
    {
        return <<<PHP
<?php
declare(strict_types=1);

use Fendx\Database\Migration;
use Fendx\Database\Schema\Blueprint;

class {{class_name}} extends Migration
{
    public function up(): void
    {
        \$this->schema->create('{{table_name}}', function (Blueprint \$table) {
{{up_methods}});
    }

    public function down(): void
    {
        \$this->schema->dropIfExists('{{table_name}}');
    }
}
PHP;
    }

    private function getFactoryTemplate(): string
    {
        return <<<PHP
<?php
declare(strict_types=1);

namespace {{namespace}};

use Fendx\Database\Factories\Factory;
use {{model_namespace}}\{{model_class}};

class {{class_name}} extends Factory
{
    protected string \$model = {{model_class}}::class;

    public function definition(): array
    {
        return [
{{definition}};
    }
}
PHP;
    }

    private function getSeederTemplate(): string
    {
        return <<<PHP
<?php
declare(strict_types=1);

namespace {{namespace}};

use Fendx\Database\Seeder;
use {{model_namespace}}\{{model_class}};

class {{class_name}} extends Seeder
{
    public function run(): void
    {
        {{model_class}}::factory()->count(10)->create();
    }
}
PHP;
    }
}