/**
 * Initial database schema migration
 * Creates links, lists, and link_lists tables
 */
module.exports = {
  up: async (queryInterface, Sequelize) => {
    // Create links table
    await queryInterface.createTable('links', {
      id: {
        type: Sequelize.UUID,
        defaultValue: Sequelize.UUIDV4,
        primaryKey: true
      },
      url: {
        type: Sequelize.TEXT,
        allowNull: false,
        unique: true
      },
      title: {
        type: Sequelize.TEXT,
        allowNull: true
      },
      description: {
        type: Sequelize.TEXT,
        allowNull: true
      },
      image: {
        type: Sequelize.TEXT,
        allowNull: true
      },
      created_at: {
        type: Sequelize.DATE,
        allowNull: false,
        defaultValue: Sequelize.literal('CURRENT_TIMESTAMP')
      },
      created_by: {
        type: Sequelize.TEXT,
        allowNull: true
      },
      modified_at: {
        type: Sequelize.DATE,
        allowNull: true
      },
      modified_by: {
        type: Sequelize.TEXT,
        allowNull: true
      },
      archived: {
        type: Sequelize.BOOLEAN,
        defaultValue: false,
        allowNull: false
      }
    });

    // Create lists table
    await queryInterface.createTable('lists', {
      id: {
        type: Sequelize.UUID,
        defaultValue: Sequelize.UUIDV4,
        primaryKey: true
      },
      name: {
        type: Sequelize.TEXT,
        allowNull: false
      },
      created_at: {
        type: Sequelize.DATE,
        allowNull: false,
        defaultValue: Sequelize.literal('CURRENT_TIMESTAMP')
      },
      created_by: {
        type: Sequelize.TEXT,
        allowNull: true
      },
      modified_at: {
        type: Sequelize.DATE,
        allowNull: true
      },
      modified_by: {
        type: Sequelize.TEXT,
        allowNull: true
      },
      public: {
        type: Sequelize.BOOLEAN,
        defaultValue: false,
        allowNull: false
      }
    });

    // Create link_lists junction table
    await queryInterface.createTable('link_lists', {
      link_id: {
        type: Sequelize.UUID,
        allowNull: false,
        references: {
          model: 'links',
          key: 'id'
        },
        onUpdate: 'CASCADE',
        onDelete: 'CASCADE'
      },
      list_id: {
        type: Sequelize.UUID,
        allowNull: false,
        references: {
          model: 'lists',
          key: 'id'
        },
        onUpdate: 'CASCADE',
        onDelete: 'CASCADE'
      }
    });

    // Add composite primary key
    await queryInterface.addConstraint('link_lists', {
      fields: ['link_id', 'list_id'],
      type: 'primary key',
      name: 'link_lists_pkey'
    });

    // Create indexes for better performance
    await queryInterface.addIndex('links', ['url'], { unique: true });
    await queryInterface.addIndex('links', ['created_at']);
    await queryInterface.addIndex('links', ['archived']);
    await queryInterface.addIndex('lists', ['name']);
    await queryInterface.addIndex('link_lists', ['link_id']);
    await queryInterface.addIndex('link_lists', ['list_id']);
  },

  down: async (queryInterface, Sequelize) => {
    await queryInterface.dropTable('link_lists');
    await queryInterface.dropTable('lists');
    await queryInterface.dropTable('links');
  }
};