import json
from jsonschema import validate, Draft7Validator, FormatChecker

class ConfigValidator:
    """配置文件验证器"""
    
    SCHEMA = {
        "type": "object",
        "properties": {
            "plcs": {
                "type": "array",
                "minItems": 1,
                "items": {
                    "type": "object",
                    "properties": {
                        "name": {"type": "string", "minLength": 1},
                        "ip": {"type": "string", "format": "ipv4"},
                        "rack": {"type": "integer", "minimum": 0},
                        "slot": {"type": "integer", "minimum": 0},
                        "areas": {
                            "type": "array",
                            "minItems": 1,
                            "items": {
                                "type": "object",
                                "properties": {
                                    "name": {"type": "string", "minLength": 1},
                                    "type": {"type": "string", "enum": ["read", "write", "read_write"]},
                                    "db_number": {"type": "integer", "minimum": 1},
                                    "offset": {"type": "integer", "minimum": 0},
                                    "size": {"type": "integer", "minimum": 1},
                                    "structure": {
                                        "type": "array",
                                        "items": {
                                            "type": "object",
                                            "properties": {
                                                "name": {"type": "string"},
                                                "type": {"type": "string", "enum": ["bool", "byte", "int", "dint", "real", "word", "dword"]},
                                                "offset": {"type": "integer", "minimum": 0},
                                                "bit": {"type": "integer", "minimum": 0, "maximum": 7}  # 修复了这里
                                            },
                                            "required": ["name", "type", "offset"]
                                        }
                                    }
                                },
                                "required": ["name", "type", "db_number", "offset", "size"]
                            }
                        }
                    },
                    "required": ["name", "ip", "rack", "slot", "areas"]
                }
            }
        },
        "required": ["plcs"]
    }

    @staticmethod
    def validate_config(config):
        """验证配置是否符合规范"""
        try:
            # 添加IPv4格式验证
            validator = Draft7Validator(
                ConfigValidator.SCHEMA,
                format_checker=FormatChecker(["ipv4"])
            )
            validator.validate(config)
            return True, None
        except Exception as e:
            return False, str(e)
    
    @staticmethod
    def is_valid_ip(ip):
        """验证IP地址格式"""
        parts = ip.split('.')
        if len(parts) != 4:
            return False
        for part in parts:
            if not part.isdigit():
                return False
            num = int(part)
            if num < 0 or num > 255:
                return False
        return True