#!/usr/bin/env python
# -*- coding: utf-8 -*-
"""
工作流引擎基础模块
定义核心类型、枚举和数据类
"""
import logging
import uuid
from dataclasses import dataclass
from datetime import datetime
from enum import Enum
from typing import Dict, Any

logger = logging.getLogger(__name__)


class NodeType(Enum):
    """节点类型"""
    START = 'start'
    END = 'end'
    APPROVAL = 'approval'
    HANDLE = 'handle'
    COPY = 'copy'
    CONDITION = 'condition'
    PARALLEL = 'parallel'
    DELAY = 'delay'
    NOTIFY = 'notify'
    SERVICE = 'service'
    SUBFLOW = 'subflow'
    DATA_UPDATE = 'data_update'


class TaskAction(Enum):
    """任务操作"""
    APPROVE = 'approve'
    REJECT = 'reject'
    TRANSFER = 'transfer'
    RETURN = 'return'
    DELEGATE = 'delegate'
    ADD_SIGN = 'add_sign'


class MultiApprovalType(Enum):
    """多人审批类型"""
    SEQUENTIAL = 'sequential'
    PARALLEL = 'parallel'
    ANY = 'any'


class InstanceStatus(Enum):
    """流程实例状态"""
    PENDING = 'pending'
    APPROVED = 'approved'
    REJECTED = 'rejected'
    CANCELED = 'canceled'


class TaskStatus(Enum):
    """任务状态"""
    PENDING = 'pending'
    WAITING = 'waiting'
    APPROVED = 'approved'
    REJECTED = 'rejected'
    RETURNED = 'returned'
    TRANSFERRED = 'transferred'
    DELEGATED = 'delegated'
    HANDLED = 'handled'
    CANCELED = 'canceled'
    READ = 'read'


@dataclass
class ExecutionContext:
    """
    执行上下文
    在流程执行过程中传递的上下文信息
    """
    instance: Any
    form_data: Dict
    current_user_id: str
    flow_definition: Dict
    db: Any = None

    def get_initiator_id(self) -> str:
        """获取发起人ID"""
        return self.instance.initiator_id if self.instance else ''

    def get_instance_id(self) -> str:
        """获取实例ID"""
        return str(self.instance.id) if self.instance else ''

    def get_current_node_id(self) -> str:
        """获取当前节点ID"""
        return self.instance.current_node_id if self.instance else ''


def generate_instance_no() -> str:
    """生成流程实例编号"""
    now = datetime.now()
    return f"WF{now.strftime('%Y%m%d%H%M%S')}{str(uuid.uuid4())[:8].upper()}"