'use strict';

/** @type {import('sequelize-cli').Migration} */
module.exports = {
  async up(queryInterface, Sequelize) {
    await queryInterface.createTable('categories', {
      id: {
        type: Sequelize.CHAR(36),
        primaryKey: true,
        allowNull: false,
        defaultValue: Sequelize.UUIDV4,
        comment: 'UUID primary key'
      },
      name: {
        type: Sequelize.STRING(100),
        allowNull: false,
        unique: true,
        comment: 'Category name'
      },
      slug: {
        type: Sequelize.STRING(100),
        allowNull: false,
        unique: true,
        comment: 'URL-friendly slug'
      },
      description: {
        type: Sequelize.TEXT,
        allowNull: true,
        comment: 'Category description'
      },
      icon: {
        type: Sequelize.STRING(255),
        allowNull: true,
        comment: 'Icon URL or class'
      },
      color: {
        type: Sequelize.STRING(20),
        allowNull: true,
        comment: 'Display color (hex or name)'
      },
      is_active: {
        type: Sequelize.BOOLEAN,
        allowNull: false,
        defaultValue: true,
        comment: 'Category active status'
      },
      guest_accessible: {
        type: Sequelize.BOOLEAN,
        allowNull: false,
        defaultValue: false,
        comment: 'Whether guests can access this category'
      },
      
      // Statistics
      question_count: {
        type: Sequelize.INTEGER,
        allowNull: false,
        defaultValue: 0,
        comment: 'Total number of questions in this category'
      },
      quiz_count: {
        type: Sequelize.INTEGER,
        allowNull: false,
        defaultValue: 0,
        comment: 'Total number of quizzes taken in this category'
      },
      
      // Display order
      display_order: {
        type: Sequelize.INTEGER,
        allowNull: false,
        defaultValue: 0,
        comment: 'Display order (lower numbers first)'
      },
      
      // Timestamps
      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('categories', ['name'], {
      unique: true,
      name: 'idx_categories_name'
    });

    await queryInterface.addIndex('categories', ['slug'], {
      unique: true,
      name: 'idx_categories_slug'
    });

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

    await queryInterface.addIndex('categories', ['guest_accessible'], {
      name: 'idx_categories_guest_accessible'
    });

    await queryInterface.addIndex('categories', ['display_order'], {
      name: 'idx_categories_display_order'
    });

    await queryInterface.addIndex('categories', ['is_active', 'guest_accessible'], {
      name: 'idx_categories_active_guest'
    });

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

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