"""
节点加载器
负责自动加载内置节点和自定义节点
支持函数节点加载
"""
import importlib
import sys
import json
from pathlib import Path
from typing import Dict, Any
from ..core.user_manager import CLOUD_ROOT
from ..core.cache_manager import CacheManager

def load_builtin_nodes() -> Dict[str, Any]:
    """
    加载内置节点
    
    Returns:
        加载结果统计
    """
    from .node_registry import NodeRegistry
    
    # 确保项目根目录在 sys.path 中，便于按包名导入
    project_root = Path(__file__).resolve().parents[2]
    if str(project_root) not in sys.path:
        sys.path.insert(0, str(project_root))
    
    # 获取节点模块目录
    nodes_dir = Path(__file__).parent.parent / "nodes"
    custom_nodes_dir = CLOUD_ROOT / "custom_nodes"

    # 要加载的模块列表
    ignore_node_modules = [
        "example_nodes",
        "advanced_example_nodes", 
    ]
    
    loaded = 0
    failed = 0
    errors = []
    
    for module_path in nodes_dir.glob("*.py"):
        module_name = module_path.stem
        if module_name in ignore_node_modules:
            continue
        try:
            # 导入模块（按完整包路径）
            module = importlib.import_module(f"server.app.nodes.{module_name}")
            loaded += 1
            print(f"📦 加载节点模块: {module_name}")
        except Exception as e:
            failed += 1
            error_msg = f"❌ 加载失败: {module_name} - {str(e)}"
            errors.append(error_msg)
            print(error_msg)
    # todo: 加载 custom_nodes 目录下的用户自定义节点模块，如果有的话
    if custom_nodes_dir.exists():
        for module_path in custom_nodes_dir.glob("*.py"):
            module_name = module_path.stem
            try:
                module = importlib.import_module(f"cloud.custom_nodes.{module_name}")
                loaded += 1
                print(f"📦 加载自定义节点模块: {module_name}")
            except Exception as e:
                failed += 1
                error_msg = f"❌ 加载自定义节点失败: {module_name} - {str(e)}"
                errors.append(error_msg)
                print(error_msg)
    # 获取注册统计
    stats = NodeRegistry.get_stats()
    return {
        "modules_loaded": loaded,
        "modules_failed": failed,
        "nodes_registered": stats["total"],
        "categories": stats["categories"],
        "errors": errors
    }


def load_custom_nodes() -> Dict[str, Any]:
    """
    加载自定义节点
    
    Returns:
        加载结果统计
    """
    # TODO: 实现自定义节点加载逻辑
    return {
        "loaded": 0,
        "failed": 0,
        "errors": []
    }


def load_function_nodes() -> Dict[str, Any]:
    """
    加载函数节点（从 functions 目录）
    
    Returns:
        加载结果统计
    """
    from .node_registry import NodeRegistry
    from .function_nodes import create_function_node_class
    
    # 获取 functions 目录
    project_root = Path(__file__).resolve().parents[3]
    functions_dir = project_root / "cloud" / "custom_nodes" / "functions"
    
    if not functions_dir.exists():
        return {
            "loaded": 0,
            "failed": 0,
            "errors": ["functions 目录不存在"]
        }
    
    loaded = 0
    failed = 0
    errors = []
    
    # 遍历所有 .json 文件
    for json_file in functions_dir.glob("*.json"):
        try:
            # 读取函数定义
            with open(json_file, 'r', encoding='utf-8') as f:
                workflow_data = json.load(f)
            
            function_name = workflow_data.get("function_name", json_file.stem)
            
            # 创建函数节点类
            node_class = create_function_node_class(function_name, workflow_data)
            
            # 注册到节点注册表
            NodeRegistry.register(node_class)
            
            loaded += 1
            print(f"📦 加载函数节点: {function_name}")
            
        except Exception as e:
            failed += 1
            error_msg = f"❌ 加载函数失败: {json_file.name} - {str(e)}"
            errors.append(error_msg)
            print(error_msg)
    
    return {
        "loaded": loaded,
        "failed": failed,
        "errors": errors
    }


def reload_custom_nodes() -> Dict[str, Any]:
    """
    重新加载所有节点（包括内置和自定义）
    
    Returns:
        加载结果统计
    """
    from .node_registry import NodeRegistry
    
    # 清空注册表
    NodeRegistry.clear()
    
    # 加载内置节点
    builtin_result = load_builtin_nodes()
    
    # 加载自定义节点
    custom_result = load_custom_nodes()
    
    total = builtin_result["nodes_registered"] + custom_result["loaded"]
    
    return {
        "total": total,
        "loaded": total,
        "builtin": builtin_result,
        "custom": custom_result
    }