const { DataTypes } = require('sequelize');

module.exports = (sequelize) => {
  const User = sequelize.define('User', {
    id: {
      type: DataTypes.UUID,
      defaultValue: DataTypes.UUIDV4,
      primaryKey: true
    },
    username: {
      type: DataTypes.STRING,
      allowNull: false,
      unique: true,
      validate: {
        len: [3, 50]
      }
    },
    email: {
      type: DataTypes.STRING,
      allowNull: false,
      unique: true,
      validate: {
        isEmail: true
      }
    },
    password_hash: {
      type: DataTypes.STRING,
      allowNull: false
    },
    first_name: {
      type: DataTypes.STRING,
      allowNull: true
    },
    last_name: {
      type: DataTypes.STRING,
      allowNull: true
    },
    phone_number: {
      type: DataTypes.STRING,
      allowNull: true,
      comment: 'Phone number for SMS alerts (include country code)'
    },
    role: {
      type: DataTypes.ENUM('admin', 'operator', 'viewer'),
      defaultValue: 'viewer',
      comment: 'User role for permission management'
    },
    is_active: {
      type: DataTypes.BOOLEAN,
      defaultValue: true
    },
    sms_alerts_enabled: {
      type: DataTypes.BOOLEAN,
      defaultValue: false,
      comment: 'Whether user wants to receive SMS alerts'
    },
    email_alerts_enabled: {
      type: DataTypes.BOOLEAN,
      defaultValue: true,
      comment: 'Whether user wants to receive email alerts'
    },
    last_login: {
      type: DataTypes.DATE,
      allowNull: true
    },
    timezone: {
      type: DataTypes.STRING,
      defaultValue: 'UTC',
      comment: 'User timezone for alert scheduling'
    },
    created_at: {
      type: DataTypes.DATE,
      defaultValue: DataTypes.NOW
    },
    updated_at: {
      type: DataTypes.DATE,
      defaultValue: DataTypes.NOW
    }
  }, {
    tableName: 'users',
    timestamps: true,
    createdAt: 'created_at',
    updatedAt: 'updated_at',
    indexes: [
      {
        fields: ['email']
      },
      {
        fields: ['username']
      },
      {
        fields: ['phone_number']
      }
    ]
  });

  return User;
};