import { QueryInterface, DataTypes } from 'sequelize';

/**
 * Migration: Create users table
 * This must run FIRST before other tables that reference users
 */
export async function up(queryInterface: QueryInterface): Promise<void> {
  // Create users table
  await queryInterface.createTable('users', {
    user_id: {
      type: DataTypes.UUID,
      primaryKey: true,
      defaultValue: DataTypes.UUIDV4,
      field: 'user_id'
    },
    employee_id: {
      type: DataTypes.STRING(50),
      allowNull: true,
      field: 'employee_id'
    },
    okta_sub: {
      type: DataTypes.STRING(100),
      allowNull: false,
      unique: true,
      field: 'okta_sub'
    },
    email: {
      type: DataTypes.STRING(255),
      allowNull: false,
      unique: true,
      field: 'email'
    },
    first_name: {
      type: DataTypes.STRING(100),
      allowNull: true,
      field: 'first_name'
    },
    last_name: {
      type: DataTypes.STRING(100),
      allowNull: true,
      field: 'last_name'
    },
    display_name: {
      type: DataTypes.STRING(200),
      allowNull: true,
      field: 'display_name'
    },
    department: {
      type: DataTypes.STRING(100),
      allowNull: true
    },
    designation: {
      type: DataTypes.STRING(100),
      allowNull: true
    },
    phone: {
      type: DataTypes.STRING(20),
      allowNull: true
    },
    location: {
      type: DataTypes.JSONB,
      allowNull: true
    },
    is_active: {
      type: DataTypes.BOOLEAN,
      defaultValue: true,
      field: 'is_active'
    },
    is_admin: {
      type: DataTypes.BOOLEAN,
      defaultValue: false,
      field: 'is_admin'
    },
    last_login: {
      type: DataTypes.DATE,
      allowNull: true,
      field: 'last_login'
    },
    created_at: {
      type: DataTypes.DATE,
      allowNull: false,
      defaultValue: DataTypes.NOW,
      field: 'created_at'
    },
    updated_at: {
      type: DataTypes.DATE,
      allowNull: false,
      defaultValue: DataTypes.NOW,
      field: 'updated_at'
    }
  });

  // Create indexes
  await queryInterface.addIndex('users', ['email'], {
    name: 'users_email_idx',
    unique: true
  });

  await queryInterface.addIndex('users', ['okta_sub'], {
    name: 'users_okta_sub_idx',
    unique: true
  });

  await queryInterface.addIndex('users', ['employee_id'], {
    name: 'users_employee_id_idx'
  });

  // Users table created
}

export async function down(queryInterface: QueryInterface): Promise<void> {
  await queryInterface.dropTable('users');
  // Users table dropped
}