'use strict';

module.exports = {
  async up(queryInterface, Sequelize) {
    await queryInterface.createTable('announcements', {
      id: {
        type:          Sequelize.BIGINT,
        autoIncrement: true,
        primaryKey:    true,
      },
      title: {
        type:      Sequelize.STRING(255),
        allowNull: false,
      },
      body: {
        type:      Sequelize.TEXT,
        allowNull: false,
      },
      scope: {
        type:         Sequelize.ENUM('global', 'course', 'role'),
        allowNull:    false,
        defaultValue: 'global',
      },
      priority: {
        type:         Sequelize.ENUM('low', 'normal', 'urgent'),
        allowNull:    false,
        defaultValue: 'normal',
      },
      published_by: {
        type:       Sequelize.BIGINT,
        allowNull:  true,
        references: { model: 'users', key: 'user_id' },
        onDelete:   'SET NULL',
      },
      starts_at: {
        type:      Sequelize.DATE,
        allowNull: true,
      },
      ends_at: {
        type:      Sequelize.DATE,
        allowNull: true,
      },
      is_active: {
        type:         Sequelize.BOOLEAN,
        allowNull:    false,
        defaultValue: true,
      },
      created_at: {
        type:         Sequelize.DATE,
        allowNull:    false,
        defaultValue: Sequelize.literal('CURRENT_TIMESTAMP'),
      },
      updated_at: {
        type:         Sequelize.DATE,
        allowNull:    false,
        defaultValue: Sequelize.literal('CURRENT_TIMESTAMP'),
      },
    });

    await queryInterface.addIndex('announcements', { fields: ['scope'],     name: 'idx_announcements_scope' });
    await queryInterface.addIndex('announcements', { fields: ['is_active'], name: 'idx_announcements_is_active' });
  },

  async down(queryInterface) {
    await queryInterface.dropTable('announcements');
  },
};