package model_classes

import (
	"database/sql"
	"errors"

	. "git.andr3h3nriqu3s.com/andr3/fyp/logic/db_types"
	. "git.andr3h3nriqu3s.com/andr3/fyp/logic/utils"
)

type ModelClass struct {
	Id      string `json:"id"`
	ModelId string `json:"model_id" db:"model_id"`
	Name    string `json:"name"`
	Status  int    `json:"status"`
}

func ListClasses(c *Context, model_id string) (cls []*ModelClass, err error) {
	return GetDbMultitple[ModelClass](c, "model_classes where model_id=$1", model_id)
}

func ModelHasDataPoints(db *sql.DB, model_id string) (result bool, err error) {
	result = false
	rows, err := db.Query("select mdp.id from model_data_point as mdp join model_classes as mc on mc.id = mdp.class_id where mc.model_id = $1 limit 1;", model_id)
	if err != nil {
		return
	}
	defer rows.Close()

	return rows.Next(), nil
}

var ClassAlreadyExists = errors.New("Class aready exists")

func CreateClass(db *sql.DB, model_id string, order int, name string) (id string, err error) {
	id = ""
	rows, err := db.Query("select id from model_classes where model_id=$1 and name=$2;", model_id, name)
	if err != nil {
		return
	}
	defer rows.Close()

	if rows.Next() {
		return id, ClassAlreadyExists
	}

	rows, err = db.Query("insert into model_classes (model_id, name, class_order) values ($1, $2, $3) returning id;", model_id, name, order)
	if err != nil {
		return
	}
	defer rows.Close()

	if !rows.Next() {
		return id, errors.New("Insert did not return anything")
	}

	err = rows.Scan(&id)
	return
}

func GetNumberOfWrongDataPoints(db *sql.DB, model_id string) (number int, err error) {
	number = 0
	rows, err := db.Query("select count(mdp.id) from model_data_point as mdp join model_classes as mc on mc.id = mdp.class_id where mc.model_id=$1 and mdp.status=-1;", model_id)
	if err != nil {
		return
	}
	defer rows.Close()
	// TODO not an error because if there is no result means that there is no need to count
	if !rows.Next() {
		return
	}
	err = rows.Scan(&number)
	return
}