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

module.exports = (sequelize) => {
  const Device = sequelize.define('Device', {
    id: {
      type: DataTypes.INTEGER,
      primaryKey: true,
      autoIncrement: true,
      allowNull: false,
      comment: 'Unique device identifier'
    },
    name: {
      type: DataTypes.STRING,
      allowNull: true,
      comment: 'Human-readable device name'
    },
    geo_lat: {
      type: DataTypes.DECIMAL(10, 8),
      allowNull: true,
      comment: 'Device latitude coordinate'
    },
    geo_lon: {
      type: DataTypes.DECIMAL(11, 8),
      allowNull: true,
      comment: 'Device longitude coordinate'
    },
    location_description: {
      type: DataTypes.TEXT,
      allowNull: true,
      comment: 'Human-readable location description'
    },
    is_active: {
      type: DataTypes.BOOLEAN,
      defaultValue: true,
      comment: 'Whether the device is currently active'
    },
    is_approved: {
      type: DataTypes.BOOLEAN,
      defaultValue: false,
      comment: 'Whether the device is approved to send data'
    },
    tenant_id: {
      type: DataTypes.INTEGER,
      allowNull: true,
      references: {
        model: 'tenants',
        key: 'id'
      },
      comment: 'Foreign key to tenants table for multi-tenant isolation'
    },
    last_heartbeat: {
      type: DataTypes.DATE,
      allowNull: true,
      comment: 'Timestamp of last heartbeat received'
    },
    heartbeat_interval: {
      type: DataTypes.INTEGER,
      defaultValue: 300, // 5 minutes
      comment: 'Expected heartbeat interval in seconds'
    },
    firmware_version: {
      type: DataTypes.STRING,
      allowNull: true,
      comment: 'Device firmware version'
    },
    installation_date: {
      type: DataTypes.DATE,
      allowNull: true,
      comment: 'When the device was installed'
    },
    notes: {
      type: DataTypes.TEXT,
      allowNull: true,
      comment: 'Additional notes about the device'
    },
    created_at: {
      type: DataTypes.DATE,
      defaultValue: DataTypes.NOW
    },
    updated_at: {
      type: DataTypes.DATE,
      defaultValue: DataTypes.NOW
    }
  }, {
    tableName: 'devices',
    timestamps: true,
    createdAt: 'created_at',
    updatedAt: 'updated_at',
    indexes: [
      {
        fields: ['geo_lat', 'geo_lon']
      },
      {
        fields: ['last_heartbeat']
      },
      {
        fields: ['is_active']
      },
      {
        fields: ['is_approved']
      }
    ]
  });

  return Device;
};