'use strict';

/**
 * 迁移文件：创建答题记录表（exam_submissions）
 * 存储选手的试卷答题记录
 */

module.exports = {
  up: async (queryInterface, Sequelize) => {
    const { INTEGER, TEXT, DATE } = Sequelize;

    await queryInterface.createTable('exam_submissions', {
      id: {
        type: INTEGER,
        primaryKey: true,
        autoIncrement: true,
        allowNull: false,
        comment: '答题记录唯一标识',
      },
      contestant_id: {
        type: INTEGER,
        allowNull: false,
        comment: '选手 ID',
        references: {
          model: 'contestants',
          key: 'id',
        },
        onUpdate: 'CASCADE',
        onDelete: 'CASCADE',
      },
      answers: {
        type: TEXT,
        allowNull: false,
        comment: '答题内容（JSON）',
      },
      submit_time: {
        type: DATE,
        allowNull: false,
        comment: '提交时间',
      },
      score: {
        type: INTEGER,
        allowNull: true,
        defaultValue: null,
        comment: '试卷得分',
      },
      created_at: {
        type: DATE,
        allowNull: false,
        comment: '创建时间',
      },
      updated_at: {
        type: DATE,
        allowNull: false,
        comment: '更新时间',
      },
    });

    await queryInterface.addIndex('exam_submissions', ['contestant_id'], {
      name: 'idx_exam_submissions_contestant_id',
    });
  },

  down: async (queryInterface) => {
    await queryInterface.dropTable('exam_submissions');
  },
};