// 导入数据库操作函数
import {
  generateExamineePaper,
  loadPaperSerial,
  getQuestionByRelatedId,
  updateExamineeAnswer,
  startPaper,
  submitPaper,
  endPaper,
  processPaper,
  checkPaperAnswers, // 添加导入
} from "../db/examing.js";
import { getDbConnection, closeAllConnections } from "../db/index.js";
import { getUserDbPath } from "../db/path.js";

/**
 * 服务层：生成考生试卷
 * @param {Object} examineeData - 考生数据
 * @param {number} examDuration - 考试时长(分钟)
 * @returns {Promise<Object>} - 包含试卷ID和状态的对象
 */
// 变更函数入参和验证逻辑
export async function generateExamineePaperService(examineeData, examData) {
  try {
    // 数据验证
    if (!examineeData || !examineeData.id || !examineeData.examinee_name) {
      throw new Error("考生数据不完整，必须包含ID和姓名");
    }

    if (!examData || !examData.exam_minutes || examData.exam_minutes <= 0) {
      throw new Error("考试时长必须为正数");
    }

    if (
      examData.exam_minutes_min === undefined ||
      examData.exam_minutes_min < 0
    ) {
      throw new Error("最短考试时长必须为非负数");
    }

    const result = await generateExamineePaper(examineeData, examData);
    return result;
  } catch (error) {
    console.error("服务层: 生成考生试卷失败", error);
    return {
      success: false,
      message: `生成试卷失败: ${error.message}`,
    };
  }
}

/**
 * 服务层：获取考生试卷状态
 * @param {number} examineeId - 考生ID
 * @returns {Promise<Object|null>} - 试卷状态信息
 */
export async function getExamineePaperStatusService(examineeId) {
  try {
    if (!examineeId || examineeId <= 0) {
      throw new Error("考生ID必须为正数");
    }

    const userDb = await getDbConnection(getUserDbPath());
    const paperStatus = await userDb.getAsync(
      "SELECT * FROM examinee_papers WHERE examinee_id = ?",
      [examineeId]
    );

    return paperStatus;
  } catch (error) {
    console.error("服务层: 获取考生试卷状态失败", error);
    throw error;
  }
}

/**
 * 服务层：更新试卷状态
 * @param {number} paperId - 试卷ID
 * @param {Object} statusData - 状态数据
 * @returns {Promise<boolean>} - 是否更新成功
 */
export async function updatePaperStatusService(paperId, statusData) {
  try {
    if (!paperId || paperId <= 0) {
      throw new Error("试卷ID必须为正数");
    }

    const userDb = await getDbConnection(getUserDbPath());

    // 构建更新字段
    const fields = [];
    const values = [];

    if (statusData.paper_start_time !== undefined) {
      fields.push("paper_start_time = ?");
      values.push(statusData.paper_start_time);
    }

    if (statusData.paper_last_time !== undefined) {
      fields.push("paper_last_time = ?");
      values.push(statusData.paper_last_time);
    }

    if (statusData.paper_submit_time !== undefined) {
      fields.push("paper_submit_time = ?");
      values.push(statusData.paper_submit_time);
    }

    if (statusData.paper_end_time !== undefined) {
      fields.push("paper_end_time = ?");
      values.push(statusData.paper_end_time);
    }

    if (statusData.paper_status !== undefined) {
      fields.push("paper_status = ?");
      values.push(statusData.paper_status);
    }

    if (statusData.paper_score_real !== undefined) {
      fields.push("paper_score_real = ?");
      values.push(statusData.paper_score_real);
    }

    if (fields.length === 0) {
      return true; // 没有需要更新的字段
    }

    // 添加WHERE条件的值
    values.push(paperId);

    const sql = `UPDATE examinee_papers SET ${fields.join(", ")} WHERE id = ?`;
    await userDb.runAsync(sql, values);

    return true;
  } catch (error) {
    console.error("服务层: 更新试卷状态失败", error);
    throw error;
  }
}

/**
 * 服务层：加载试卷试题序列
 * @param {number} paperId - 试卷ID
 * @returns {Promise<Array>} - 包含试题序列的数组
 */
export async function loadPaperSerialService(paperId) {
  try {
    if (!paperId || paperId <= 0) {
      throw new Error("试卷ID必须为正数");
    }

    const result = await loadPaperSerial(paperId);
    return {
      success: true,
      data: result,
    };
  } catch (error) {
    console.error("服务层: 加载试卷试题序列失败", error);
    return {
      success: false,
      message: `加载试卷试题序列失败: ${error.message}`,
    };
  }
}

/**
 * 服务层：根据表名和ID获取完整的试题数据
 * @param {string} tableName - 表名 (question_choices 或 question_fill_blanks)
 * @param {number} id - 记录ID
 * @returns {Promise<Object>} - 包含试题数据的对象
 */
export async function getQuestionByRelatedIdService(tableName, id) {
  try {
    // if (!tableName || !['question_choices', 'question_fill_blanks'].includes(tableName)) {
    //   throw new Error('无效的表名，只能是 question_choices 或 question_fill_blanks');
    // }

    // if (!id || id <= 0) {
    //   throw new Error('记录ID必须为正数');
    // }

    const result = await getQuestionByRelatedId(tableName, id);
    return {
      success: true,
      data: result,
    };
  } catch (error) {
    console.error("服务层: 获取试题数据失败", error);
    return {
      success: false,
      message: `获取试题数据失败: ${error.message}`,
    };
  }
}

/**
 * 服务层：更新考生答案
 * @param {string} tableName - 表名 (question_choices 或 question_fill_blanks)
 * @param {number} id - 记录ID
 * @param {Array|string} answers - 考生答案
 * @returns {Promise<Object>} - 包含更新结果的对象
 */
export async function updateExamineeAnswerService(tableName, id, answers) {
  try {
    if (!["question_choices", "question_fill_blanks"].includes(tableName)) {
      throw new Error(
        "无效的表名，只能是 question_choices 或 question_fill_blanks"
      );
    }

    if (!id || id <= 0) {
      throw new Error("记录ID必须为正数");
    }

    const result = await updateExamineeAnswer(tableName, id, answers);
    return {
      success: true,
      message: "答案更新成功",
    };
  } catch (error) {
    console.error("服务层: 更新考生答案失败", error);
    return {
      success: false,
      message: `更新答案失败: ${error.message}`,
    };
  }
}

/**
 * 服务层：开始考试
 * @param {number} paperId - 试卷ID
 * @returns {Promise<Object>} - 包含操作结果的对象
 */
export async function startPaperService(paperId) {
  try {
    if (!paperId || paperId <= 0) {
      throw new Error("试卷ID必须为正数");
    }

    const result = await startPaper(paperId);
    return result;
  } catch (error) {
    console.error("服务层: 开始考试失败", error);
    return {
      success: false,
      message: `开始考试失败: ${error.message}`,
    };
  }
}

/**
 * 服务层：提交考试
 * @param {number} paperId - 试卷ID
 * @returns {Promise<Object>} - 包含操作结果的对象
 */
export async function submitPaperService(paperId) {
  try {
    if (!paperId || paperId <= 0) {
      throw new Error("试卷ID必须为正数");
    }

    const result = await submitPaper(paperId);
    return result;
  } catch (error) {
    console.error("服务层: 提交考试失败", error);
    return {
      success: false,
      message: `提交考试失败: ${error.message}`,
    };
  }
}

/**
 * 服务层：结束考试
 * @param {number} paperId - 试卷ID
 * @returns {Promise<Object>} - 包含操作结果的对象
 */
export async function endPaperService(paperId) {
  try {
    if (!paperId || paperId <= 0) {
      throw new Error("试卷ID必须为正数");
    }

    const result = await endPaper(paperId);
    return result;
  } catch (error) {
    console.error("服务层: 结束考试失败", error);
    return {
      success: false,
      message: `结束考试失败: ${error.message}`,
    };
  }
}

/**
 * 服务层：处理试卷
 * @param {number} paperId - 试卷ID
 * @returns {Promise<Object>} - 包含操作结果的对象
 */
export async function processPaperService(paperId) {
  try {
    if (!paperId || paperId <= 0) {
      throw new Error("试卷ID必须为正数");
    }

    const result = await processPaper(paperId);
    return result;
  } catch (error) {
    console.error("服务层: 处理试卷失败", error);
    return {
      success: false,
      message: `处理试卷失败: ${error.message}`,
    };
  }
}

/**
 * 服务层：检查试卷答案并计算得分
 * @param {number} paperId - 试卷ID
 * @returns {Promise<Object>} - 包含操作结果和试卷数据的对象
 */
export async function checkPaperAnswersService(paperId) {
  try {
    if (!paperId || paperId <= 0) {
      throw new Error("试卷ID必须为正数");
    }

    const result = await checkPaperAnswers(paperId);
    return result;
  } catch (error) {
    console.error("服务层: 检查试卷答案失败", error);
    return {
      success: false,
      message: `检查试卷答案失败: ${error.message}`,
    };
  }
}

/**
 * 初始化考试相关的IPC处理程序
 * @param {import('electron').IpcMain} ipcMain - IPC主进程实例
 */
export function initExamingIpc(ipcMain) {
  // 生成考生试卷
  ipcMain.handle(
    "examing-generate-paper",
    async (event, { examineeData, examData }) => {
      try {
        return await generateExamineePaperService(examineeData, examData);
      } catch (error) {
        console.error("生成考生试卷失败:", error);
        return {
          success: false,
          message: `生成试卷失败: ${error.message}`,
        };
      }
    }
  );

  // 获取考生试卷状态
  ipcMain.handle("examing-get-paper-status", async (event, examineeId) => {
    try {
      return await getExamineePaperStatusService(examineeId);
    } catch (error) {
      console.error("获取考生试卷状态失败:", error);
      return null;
    }
  });

  // 更新试卷状态
  ipcMain.handle(
    "examing-update-paper-status",
    async (event, { paperId, statusData }) => {
      try {
        return await updatePaperStatusService(paperId, statusData);
      } catch (error) {
        console.error("更新试卷状态失败:", error);
        return false;
      }
    }
  );

  // 加载试卷试题序列
  ipcMain.handle("examing-load-paper-serial", async (event, paperId) => {
    try {
      return await loadPaperSerialService(paperId);
    } catch (error) {
      console.error("加载试卷试题序列失败:", error);
      return {
        success: false,
        message: `加载试卷试题序列失败: ${error.message}`,
      };
    }
  });

  // 根据表名和ID获取完整的试题数据
  ipcMain.handle(
    "examing-get-question-by-related-id",
    async (event, { tableName, id }) => {
      try {
        return await getQuestionByRelatedIdService(tableName, id);
      } catch (error) {
        console.error("获取试题数据失败:", error);
        return {
          success: false,
          message: `获取试题数据失败: ${error.message}`,
        };
      }
    }
  );

  // 更新考生答案
  ipcMain.handle(
    "examing-update-answer",
    async (event, { tableName, id, answers }) => {
      try {
        return await updateExamineeAnswerService(tableName, id, answers);
      } catch (error) {
        console.error("更新考生答案失败:", error);
        return {
          success: false,
          message: `更新答案失败: ${error.message}`,
        };
      }
    }
  );

  // 更新导入语句
  ipcMain.handle("examing-start-paper", async (event, paperId) => {
    try {
      return await startPaperService(paperId);
    } catch (error) {
      console.error("开始考试失败:", error);
      return {
        success: false,
        message: `开始考试失败: ${error.message}`,
      };
    }
  });

  // 提交考试
  ipcMain.handle("examing-submit-paper", async (event, paperId) => {
    try {
      return await submitPaperService(paperId);
    } catch (error) {
      console.error("提交考试失败:", error);
      return {
        success: false,
        message: `提交考试失败: ${error.message}`,
      };
    }
  });

  // 结束考试
  ipcMain.handle("examing-end-paper", async (event, paperId) => {
    try {
      return await endPaperService(paperId);
    } catch (error) {
      console.error("结束考试失败:", error);
      return {
        success: false,
        message: `结束考试失败: ${error.message}`,
      };
    }
  });

  // 处理试卷
  ipcMain.handle("examing-process-paper", async (event, paperId) => {
    try {
      return await processPaperService(paperId);
    } catch (error) {
      console.error("处理试卷失败:", error);
      return {
        success: false,
        message: `处理试卷失败: ${error.message}`,
      };
    }
  });

  // 检查试卷答案并计算得分
  ipcMain.handle("examing-check-paper-answers", async (event, paperId) => {
    try {
      return await checkPaperAnswersService(paperId);
    } catch (error) {
      console.error("检查试卷答案失败:", error);
      return {
        success: false,
        message: `检查试卷答案失败: ${error.message}`,
      };
    }
  });
}