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

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

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

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

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

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

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

        connection.query(
          "SELECT * FROM service_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]);
          }
        );
      });
    });
  },

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

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

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

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

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

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

        connection.query(
          "SELECT * FROM service_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]);
          }
        );
      });
    });
  },

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

        connection.query(
          "SELECT * FROM service_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]);
          }
        );
      });
    });
  },

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

        const query = `
              UPDATE service_evaluation SET 
              service_university_commitee_h= ?,
              service_student_extra_carricular_h= ?,
              service_personal_engagement_h= ?,
              updatedAt= ?,
              updated_by= ?,
              hod_submited_yn= ?
              WHERE id = ? `;

        const values = [
          updatedService.service_university_commitee_h,
          updatedService.service_student_extra_carricular_h,
          updatedService.service_personal_engagement_h,
          updatedService.updatedAt,
          updatedService.updated_by,
          updatedService.hod_submited_yn,
          updatedService.id,
        ];
        connection.query(query, values, (error, result) => {
          connection.release();

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