const { DataTypes } = require('sequelize');
const { sequelize } = require('../config/database');

const Enrollment = sequelize.define('Enrollment', {
  id: {
    type: DataTypes.UUID,
    defaultValue: DataTypes.UUIDV4,
    primaryKey: true
  },
  status: {
    type: DataTypes.ENUM('pending', 'active', 'completed', 'cancelled'),
    allowNull: false,
    defaultValue: 'pending'
  },
  enrolledAt: {
    type: DataTypes.DATE,
    allowNull: false,
    defaultValue: DataTypes.NOW
  },
  completedAt: {
    type: DataTypes.DATE,
    allowNull: true
  },
  progress: {
    type: DataTypes.INTEGER,
    allowNull: false,
    defaultValue: 0,
    validate: {
      min: 0,
      max: 100
    }
  },
  paymentStatus: {
    type: DataTypes.ENUM('pending', 'paid', 'failed', 'refunded'),
    allowNull: false,
    defaultValue: 'pending'
  },
  paymentAmount: {
    type: DataTypes.DECIMAL(10, 2),
    allowNull: false,
    defaultValue: 0.00
  },
  paymentDate: {
    type: DataTypes.DATE,
    allowNull: true
  },
  certificateIssued: {
    type: DataTypes.BOOLEAN,
    defaultValue: false
  },
  certificateIssuedAt: {
    type: DataTypes.DATE,
    allowNull: true
  },
  notes: {
    type: DataTypes.TEXT,
    allowNull: true
  }
}, {
  tableName: 'enrollments',
  indexes: [
    {
      fields: ['userId']
    },
    {
      fields: ['courseId']
    },
    {
      fields: ['status']
    },
    {
      fields: ['paymentStatus']
    }
  ]
});

module.exports = Enrollment;