'use strict';

/** @type {import('sequelize-cli').Migration} */
module.exports = {
  async up(queryInterface, Sequelize) {
    await queryInterface.createTable('users', {
      id: {
        type: Sequelize.CHAR(36),
        primaryKey: true,
        allowNull: false,
        defaultValue: Sequelize.UUIDV4,
        comment: 'UUID primary key'
      },
      username: {
        type: Sequelize.STRING(50),
        allowNull: false,
        unique: true,
        comment: 'Unique username'
      },
      email: {
        type: Sequelize.STRING(100),
        allowNull: false,
        unique: true,
        comment: 'User email address'
      },
      password: {
        type: Sequelize.STRING(255),
        allowNull: false,
        comment: 'Hashed password'
      },
      role: {
        type: Sequelize.ENUM('admin', 'user'),
        allowNull: false,
        defaultValue: 'user',
        comment: 'User role'
      },
      profile_image: {
        type: Sequelize.STRING(255),
        allowNull: true,
        comment: 'Profile image URL'
      },
      is_active: {
        type: Sequelize.BOOLEAN,
        allowNull: false,
        defaultValue: true,
        comment: 'Account active status'
      },
      
      // Statistics
      total_quizzes: {
        type: Sequelize.INTEGER,
        allowNull: false,
        defaultValue: 0,
        comment: 'Total number of quizzes taken'
      },
      quizzes_passed: {
        type: Sequelize.INTEGER,
        allowNull: false,
        defaultValue: 0,
        comment: 'Number of quizzes passed'
      },
      total_questions_answered: {
        type: Sequelize.INTEGER,
        allowNull: false,
        defaultValue: 0,
        comment: 'Total questions answered'
      },
      correct_answers: {
        type: Sequelize.INTEGER,
        allowNull: false,
        defaultValue: 0,
        comment: 'Number of correct answers'
      },
      current_streak: {
        type: Sequelize.INTEGER,
        allowNull: false,
        defaultValue: 0,
        comment: 'Current daily streak'
      },
      longest_streak: {
        type: Sequelize.INTEGER,
        allowNull: false,
        defaultValue: 0,
        comment: 'Longest daily streak achieved'
      },
      
      // Timestamps
      last_login: {
        type: Sequelize.DATE,
        allowNull: true,
        comment: 'Last login timestamp'
      },
      last_quiz_date: {
        type: Sequelize.DATE,
        allowNull: true,
        comment: 'Date of last quiz taken'
      },
      created_at: {
        type: Sequelize.DATE,
        allowNull: false,
        defaultValue: Sequelize.literal('CURRENT_TIMESTAMP')
      },
      updated_at: {
        type: Sequelize.DATE,
        allowNull: false,
        defaultValue: Sequelize.literal('CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP')
      }
    }, {
      charset: 'utf8mb4',
      collate: 'utf8mb4_unicode_ci'
    });

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

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

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

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

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

    console.log('✅ Users table created successfully with indexes');
  },

  async down(queryInterface, Sequelize) {
    await queryInterface.dropTable('users');
    console.log('✅ Users table dropped successfully');
  }
};