const config = require("../config/config");
const mysql = require("mysql2"); // Use mysql2 for connection pooling

// Create a connection pool
const pool = mysql.createPool({
  host: config.connection.host,
  user: config.connection.user,
  password: config.connection.password,
  database: config.connection.database,
  waitForConnections: true,
  connectionLimit: 10, // Adjust as needed
  queueLimit: 0, // Unlimited queue size
});

module.exports = {
  findAllScholars: async () => {
    return new Promise((resolve, reject) => {
      pool.getConnection((err, connection) => {
        if (err) {
          return reject(err);
        }

        connection.query(
          "SELECT * FROM scholar_evaluation",
          (error, result) => {
            connection.release();

            if (error) {
              return reject(error);
            }
            resolve(result);
          }
        );
      });
    });
  },

  findPendingScholarRecord: async (id) => {
    return new Promise((resolve, reject) => {
      pool.getConnection((err, connection) => {
        if (err) {
          return reject(err);
        }

        connection.query(
          "SELECT * FROM scholar_evaluation where userId=? AND status = 'Pending'",
          id,
          (error, result) => {
            connection.release();

            if (error) {
              return reject(error);
            }
            resolve(result[0]);
          }
        );
      });
    });
  },

  findSholarlyForEvaluationDvc: async (data) => {
    return new Promise((resolve, reject) => {
      pool.getConnection((err, connection) => {
        if (err) {
          return reject(err);
        }

        connection.query(
          "SELECT * FROM scholar_evaluation where userId=? AND sessionId=? AND status = 'Pending'", // Change status to Evaluated
          [data.userId, data.sessionId],
          (error, result) => {
            connection.release();

            if (error) {
              return reject(error);
            }
            resolve(result[0]);
          }
        );
      });
    });
  },

  createScholarRecord: async (scholar) => {
    return new Promise((resolve, reject) => {
      pool.getConnection((err, connection) => {
        if (err) {
          return reject(err);
        }

        connection.query(
          "INSERT INTO scholar_evaluation SET ?",
          scholar,
          (error, result) => {
            connection.release();

            if (error) {
              return reject(error);
            }
            resolve(result);
          }
        );
      });
    });
  },
  findScholarRecordById: async (id) => {
    return new Promise((resolve, reject) => {
      pool.getConnection((err, connection) => {
        if (err) {
          return reject(err);
        }

        connection.query(
          "SELECT * FROM scholar_evaluation where id=?",
          id,
          (error, result) => {
            connection.release();

            if (error) {
              return reject(error);
            }
            resolve(result[0]);
          }
        );
      });
    });
  },

  findUserSScholarForCompilation(data) {
    return new Promise((resolve, reject) => {
      pool.getConnection((err, connection) => {
        if (err) {
          return reject(err);
        }

        connection.query(
          "SELECT * FROM scholar_evaluation where userId =? and sessionId=? and self_submite_yn='Y'",
          [data.userId, data.sessionId],
          (error, result) => {
            connection.release();

            if (error) {
              return reject(error);
            }
            resolve(result[0]);
          }
        );
      });
    });
  },

  findHodScholarForCompilation(data) {
    return new Promise((resolve, reject) => {
      pool.getConnection((err, connection) => {
        if (err) {
          return reject(err);
        }

        connection.query(
          "SELECT * FROM scholar_evaluation where userId =? and sessionId=? and status = 'Pending' and self_submite_yn='Y'",
          [data.userId, data.sessionId],
          (error, result) => {
            connection.release();

            if (error) {
              return reject(error);
            }
            resolve(result[0]);
          }
        );
      });
    });
  },

  updateScholarEvalutaionRecord: async (updateScholar) => {
    return new Promise((resolve, reject) => {
      pool.getConnection((err, connection) => {
        if (err) {
          return reject(err);
        }

        const query = `
              UPDATE scholar_evaluation SET
              schoolar_onepeer_review_h= ?,
              schoolar_decumented_research_h= ?,
              schoolar_attended_nonru_h= ?,
              schoolar_presented_paper_h= ?,
              schoolar_served_facilitator_h= ?,
              updatedAt= ?,
              updated_by= ?,
              hod_submited_yn= ?
              WHERE id = ?`;

        const values = [
          updateScholar.schoolar_onepeer_review_h,
          updateScholar.schoolar_decumented_research_h,
          updateScholar.schoolar_attended_nonru_h,
          updateScholar.schoolar_presented_paper_h,
          updateScholar.schoolar_served_facilitator_h,
          updateScholar.updatedAt,
          updateScholar.updated_by,
          updateScholar.hod_submited_yn,
          updateScholar.id,
        ];
        connection.query(query, values, (error, result) => {
          connection.release();

          if (error) {
            return reject(error);
          }
          resolve(result);
        });
      });
    });
  },
};