package mysqlkindbox

import (
	"context"
	"log"

	"git.gocasts.ir/ebhomengo/niki/entity"
	errmsg "git.gocasts.ir/ebhomengo/niki/pkg/err_msg"
	richerror "git.gocasts.ir/ebhomengo/niki/pkg/rich_error"
)

func (d DB) AddBatchKindBox(ctx context.Context, kindBoxes []entity.KindBox) ([]entity.KindBox, error) {
	const op = "mysqlkindbox.AddBatchKindBoxConcurrentlyRollback"
	errCh := make(chan error, len(kindBoxes))
	resultCh := make(chan entity.KindBox, len(kindBoxes))
	tx, tErr := d.conn.Conn().Begin()
	if tErr != nil {
		return nil, richerror.New(op).WithErr(tErr).
			WithMessage(errmsg.ErrorMsgSomethingWentWrong).WithKind(richerror.KindUnexpected)
	}

	for _, kindBox := range kindBoxes {
		go func(kb entity.KindBox) {
			res, err := tx.ExecContext(ctx,
				"insert into kind_boxes (kind_box_req_id, benefactor_id, type, serial_number, status) values (?, ?, ?, ?, ?);",
				kb.KindBoxReqID, kb.BenefactorID, kb.Type.String(), kb.SerialNumber, kb.Status.String(),
			)
			if err != nil {
				errCh <- richerror.New(op).WithErr(err).
					WithMessage(errmsg.ErrorMsgSomethingWentWrong).WithKind(richerror.KindUnexpected)

				return
			}

			//nolint
			// err is always nil
			id, _ := res.LastInsertId()
			kb.ID = uint(id)

			resultCh <- kb
			errCh <- nil
		}(kindBox)
	}

	var result []entity.KindBox

	for i := 0; i < len(kindBoxes); i++ {
		select {
		case err := <-errCh:
			if err != nil {
				if err := tx.Rollback(); err != nil {
					log.Printf("Rollback error: %v", err)
				}

				return nil, err
			}
		case res := <-resultCh:
			result = append(result, res)
		case <-ctx.Done():
			if err := tx.Rollback(); err != nil {
				log.Printf("Rollback error: %v", err)
			}

			return nil, richerror.New(op).WithErr(ctx.Err()).
				WithMessage(errmsg.ErrorMsgSomethingWentWrong).WithKind(richerror.KindUnexpected)
		}
	}

	if err := tx.Commit(); err != nil {
		log.Printf("Commit error: %v", err)

		return nil, richerror.New(op).WithErr(err).
			WithMessage(errmsg.ErrorMsgSomethingWentWrong).WithKind(richerror.KindUnexpected)
	}

	return result, nil
}