'use strict';

/** @type {import('sequelize-cli').Migration} */
module.exports = {
  async up(queryInterface, Sequelize) {
    await queryInterface.createTable('user_achievements', {
      id: {
        type: Sequelize.CHAR(36),
        primaryKey: true,
        allowNull: false,
        comment: 'UUID primary key'
      },
      user_id: {
        type: Sequelize.CHAR(36),
        allowNull: false,
        references: {
          model: 'users',
          key: 'id'
        },
        onUpdate: 'CASCADE',
        onDelete: 'CASCADE',
        comment: 'Foreign key to users table'
      },
      achievement_id: {
        type: Sequelize.CHAR(36),
        allowNull: false,
        references: {
          model: 'achievements',
          key: 'id'
        },
        onUpdate: 'CASCADE',
        onDelete: 'CASCADE',
        comment: 'Foreign key to achievements table'
      },
      earned_at: {
        type: Sequelize.DATE,
        allowNull: false,
        defaultValue: Sequelize.literal('CURRENT_TIMESTAMP'),
        comment: 'When the achievement was earned'
      },
      notified: {
        type: Sequelize.BOOLEAN,
        allowNull: false,
        defaultValue: false,
        comment: 'Whether user has been notified about this achievement'
      },
      created_at: {
        type: Sequelize.DATE,
        allowNull: false,
        defaultValue: Sequelize.literal('CURRENT_TIMESTAMP'),
        comment: 'Record creation timestamp'
      },
      updated_at: {
        type: Sequelize.DATE,
        allowNull: false,
        defaultValue: Sequelize.literal('CURRENT_TIMESTAMP'),
        comment: 'Record last update timestamp'
      }
    }, {
      charset: 'utf8mb4',
      collate: 'utf8mb4_unicode_ci',
      comment: 'Junction table tracking achievements earned by users'
    });

    // Add indexes
    await queryInterface.addIndex('user_achievements', ['user_id'], {
      name: 'idx_user_achievements_user_id'
    });

    await queryInterface.addIndex('user_achievements', ['achievement_id'], {
      name: 'idx_user_achievements_achievement_id'
    });

    await queryInterface.addIndex('user_achievements', ['earned_at'], {
      name: 'idx_user_achievements_earned_at'
    });

    await queryInterface.addIndex('user_achievements', ['notified'], {
      name: 'idx_user_achievements_notified'
    });

    // Unique composite index to prevent duplicate achievements
    await queryInterface.addIndex('user_achievements', ['user_id', 'achievement_id'], {
      name: 'idx_user_achievements_user_achievement',
      unique: true
    });

    console.log('✅ User achievements table created with 6 fields and 5 indexes');
  },

  async down(queryInterface, Sequelize) {
    await queryInterface.dropTable('user_achievements');
    console.log('✅ User achievements table dropped');
  }
};