package db

import (
	"errors"
	"time"
)

var ErrRecentlyChanged = errors.New("db: attempt to change the trust for a user twice in a month")

func GetTrustVote(targetID string) ([]int, error) {
	rows, err := db.Query("SELECT trust FROM trustVote WHERE targetUser=?", targetID)
	if err != nil {
		return nil, err
	}

	defer rows.Close()

	array := make([]int, 0)
	for rows.Next() {
		var trust int
		rows.Scan(&trust)
		array = append(array, trust)
	}

	return array, nil
}

func UpdateTrust(sourceID, targetID string, voteValue int, force bool) error {
	if !force {
		rows, err := db.Query("SELECT lastUpdated FROM trustVote WHERE sourceUser=? AND targetUser=?", sourceID, targetID)
		if err != nil {
			return err
		}
		if rows.Next() {
			//Check that it was not changed within a month.
			var lastUpdated time.Time
			rows.Scan(&lastUpdated)
			if time.Now().Sub(lastUpdated) > 24*30*time.Hour {
				rows.Close()
				return ErrRecentlyChanged
			}
		}
		rows.Close()
	}

	_, err := db.Exec("REPLACE INTO trustVote(sourceUser,targetUser,lastUpdated,trust) VALUES(?,?,?,?)", sourceID, targetID, time.Now(), voteValue)
	return err
}