package main

import (
	// External
	we "git.gibonuddevalla.se/go/wrappederror"

	// Standard
	"database/sql"
)

/*
type Problem struct {
	ID             int
	Name           string
	SectionID      int
	Expression     string
	DatapointNames []string
}
*/

func ProblemStart(trigger Trigger) (err error) {
	row := service.Db.Conn.QueryRow(`
		SELECT COUNT(id)
		FROM problem
		WHERE
			trigger_id = $1 AND
			"end" IS NULL
		GROUP BY trigger_id
		`,
		trigger.ID,
	)
	var openProblems int
	err = row.Scan(&openProblems)
	if err != nil && err != sql.ErrNoRows {
		err = we.Wrap(err).WithData(trigger.ID)
		return
	}

	// Open up a new problem if no open exists.
	if openProblems == 0 {
		_, err = service.Db.Conn.Exec(`INSERT INTO problem(trigger_id) VALUES($1)`, trigger.ID)
		if err != nil {
			err = we.Wrap(err).WithData(trigger)
		}
	}
	return
}

func ProblemClose(trigger Trigger) (err error) {
	_, err = service.Db.Conn.Exec(`UPDATE problem SET "end"=NOW() WHERE trigger_id=$1 AND "end" IS NULL`, trigger.ID)
	if err != nil {
		err = we.Wrap(err).WithData(trigger)
		return
	}
	return
}