import { OrderStateMachine, OrderStatus, OrderEvent } from '../src/core/order/order-state-machine';

describe('OrderStateMachine (TDD 测试套件: 陪玩订单状态机驱动)', () => {
  let stateMachine: OrderStateMachine;

  beforeEach(() => {
    stateMachine = new OrderStateMachine();
  });

  describe('1. 正向订单履约流转', () => {
    it('正常流程: 待付款 -> 待接单 -> 服务中 -> 待确认 -> 已完成', () => {
      let state = OrderStatus.PENDING_PAYMENT;

      state = stateMachine.transition(state, OrderEvent.PAY_SUCCESS);
      expect(state).toBe(OrderStatus.PENDING_ACCEPT);

      state = stateMachine.transition(state, OrderEvent.EXPERT_ACCEPT);
      expect(state).toBe(OrderStatus.IN_SERVICE);

      state = stateMachine.transition(state, OrderEvent.EXPERT_APPLY_FINISH);
      expect(state).toBe(OrderStatus.PENDING_CONFIRM);

      state = stateMachine.transition(state, OrderEvent.BUYER_CONFIRM);
      expect(state).toBe(OrderStatus.COMPLETED);
    });
  });

  describe('2. 取消与拒单退款流转', () => {
    it('待付款状态下买家取消，变为已取消', () => {
      const state = stateMachine.transition(OrderStatus.PENDING_PAYMENT, OrderEvent.CANCEL);
      expect(state).toBe(OrderStatus.CANCELLED);
    });

    it('待接单状态下大神拒单或超时，变为已退款', () => {
      const state = stateMachine.transition(OrderStatus.PENDING_ACCEPT, OrderEvent.EXPERT_REJECT);
      expect(state).toBe(OrderStatus.REFUNDED);
    });
  });

  describe('3. 售后与仲裁介入流转', () => {
    it('待确认状态下买家发起申诉仲裁，进入仲裁中', () => {
      const state = stateMachine.transition(OrderStatus.PENDING_CONFIRM, OrderEvent.BUYER_DISPUTE);
      expect(state).toBe(OrderStatus.DISPUTED);
    });

    it('仲裁判定买家胜诉，转为已退款', () => {
      const state = stateMachine.transition(OrderStatus.DISPUTED, OrderEvent.ARBITRATE_REFUND);
      expect(state).toBe(OrderStatus.REFUNDED);
    });

    it('仲裁驳回申诉，转为已完成', () => {
      const state = stateMachine.transition(OrderStatus.DISPUTED, OrderEvent.ARBITRATE_RELEASE);
      expect(state).toBe(OrderStatus.COMPLETED);
    });
  });

  describe('4. 非法状态跃迁防御', () => {
    it('待付款状态直接跳至已完成应抛出非法操作异常', () => {
      expect(() => {
        stateMachine.transition(OrderStatus.PENDING_PAYMENT, OrderEvent.BUYER_CONFIRM);
      }).toThrow('非法状态流转');
    });

    it('已完成订单不可再次发起退款或取消', () => {
      expect(() => {
        stateMachine.transition(OrderStatus.COMPLETED, OrderEvent.CANCEL);
      }).toThrow('非法状态流转');
    });
  });
});