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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

        const query = `
        UPDATE grants_evaluation SET
        grants_innovation= ?,
        grants_submited_h= ?,
        grants_earned_h= ?,
        grants_activity_participated_h= ?,
        grants_innovation_h= ?,
        updatedAt= ?,
        updated_by= ?,
        hod_submited_yn= ?
        WHERE id = ?
        `;
        const values = [
          updateGrants.grants_innovation,
          updateGrants.grants_submited_h,
          updateGrants.grants_earned_h,
          updateGrants.grants_activity_participated_h,
          updateGrants.grants_innovation_h,
          updateGrants.updatedAt,
          updateGrants.updated_by,
          updateGrants.hod_submited_yn,
          updateGrants.id,
        ];
        connection.query(query, values, (error, result) => {
          connection.release();

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