const { DataTypes } = require('sequelize');
const { sequelize } = require('../db');
const User = require('./User');
const Device = require('./Device');
const { generateId } = require('../utils/idGenerator');

const Ticket = sequelize.define(
  'Ticket',
  {
    ticketId: {
      type: DataTypes.STRING,
      primaryKey: true,
      allowNull: true,
      unique: true,
    },
    title: {
      type: DataTypes.STRING,
      allowNull: false,
      comment: '工单标题',
    },
    deviceId: {
      type: DataTypes.STRING,
      allowNull: true,
      comment: '关联设备ID',
    },
    deviceName: {
      type: DataTypes.STRING,
      allowNull: false,
      comment: '设备名称',
    },
    deviceModel: {
      type: DataTypes.STRING,
      comment: '设备型号',
    },
    serialNumber: {
      type: DataTypes.STRING,
      comment: '设备序列号',
    },
    faultCategory: {
      type: DataTypes.STRING,
      allowNull: false,
      comment: '故障分类',
    },
    faultSubCategory: {
      type: DataTypes.STRING,
      comment: '故障子分类',
    },
    priority: {
      type: DataTypes.STRING,
      defaultValue: 'medium',
      comment: '优先级: critical/high/medium/low',
    },
    status: {
      type: DataTypes.STRING,
      defaultValue: 'pending',
      comment: '工单状态: pending/in_progress/completed/closed/cancelled',
    },
    description: {
      type: DataTypes.TEXT,
      comment: '故障描述',
    },
    expectedCompletionDate: {
      type: DataTypes.DATE,
      comment: '期望完成时间',
    },
    reporterId: {
      type: DataTypes.STRING,
      allowNull: true,
      comment: '报修人ID',
    },
    reporterName: {
      type: DataTypes.STRING,
      allowNull: false,
      comment: '报修人姓名',
    },
    assigneeId: {
      type: DataTypes.STRING,
      comment: '处理人ID',
    },
    assigneeName: {
      type: DataTypes.STRING,
      comment: '处理人姓名',
    },
    location: {
      type: DataTypes.STRING,
      comment: '设备位置',
    },
    resolution: {
      type: DataTypes.TEXT,
      comment: '解决方案',
    },
    completionDate: {
      type: DataTypes.DATE,
      comment: '实际完成时间',
    },
    evaluation: {
      type: DataTypes.TEXT,
      comment: '用户评价',
    },
    evaluationRating: {
      type: DataTypes.INTEGER,
      comment: '评价星级(1-5)',
    },
    attachments: {
      type: DataTypes.JSON,
      defaultValue: [],
      comment: '附件列表',
    },
    tags: {
      type: DataTypes.JSON,
      defaultValue: [],
      comment: '标签',
    },
    metadata: {
      type: DataTypes.JSON,
      defaultValue: {},
      comment: '扩展字段',
    },
  },
  {
    tableName: 'tickets',
    timestamps: true,
    indexes: [
      { fields: ['deviceId'] },
      { fields: ['status'] },
      { fields: ['faultCategory'] },
      { fields: ['priority'] },
      { fields: ['reporterId'] },
      { fields: ['assigneeId'] },
      { fields: ['createdAt'] },
    ],
    hooks: {
      beforeCreate: (ticket) => {
        if (!ticket.ticketId) {
          ticket.ticketId = generateId({ prefix: 'TKT' });
        }
      },
    },
  }
);

Ticket.belongsTo(User, { foreignKey: 'reporterId', as: 'reporter', onDelete: 'SET NULL' });
Ticket.belongsTo(User, { foreignKey: 'assigneeId', as: 'assignee', onDelete: 'SET NULL' });
Ticket.belongsTo(Device, { foreignKey: 'deviceId', onDelete: 'SET NULL' });

module.exports = Ticket;