package session

import (
	"crypto/rand"
	"encoding/hex"
	"fmt"
	"html/template"
	"net/http"
	"strconv"

	"streifling.com/jason/sicherheitsunterweisung/packages/data"
)

func displayTable(w http.ResponseWriter, db *data.DB) {
	bs, err := db.GetAllOverviewTableData()
	if err != nil {
		http.Error(w, "displayTable: *DB.GetAllOverviewTableData(): "+fmt.Sprint(err), http.StatusInternalServerError)
	}
	template.Must(template.ParseFiles("templates/table.html")).ExecuteTemplate(w, "content", bs)
}

func generateLogin() (string, error) {
	bs := make([]byte, 4)

	if _, err := rand.Read(bs); err != nil {
		return "", fmt.Errorf("generateLogin: rand.Read(bs): %v\n", err)
	}

	return hex.EncodeToString(bs), nil
}

func findCorrectLogin(l string, ss *[]*Session) (*Session, *data.Participant, bool) {
	for _, session := range *ss {
		for _, p := range session.Participants {
			if l == p.Login {
				return session, p, true
			}
		}
	}
	return nil, nil, false
}

func newParticipant(l string) (*data.Participant, error) {
	var err error
	p := new(data.Participant)

	p.ID, err = strconv.ParseInt(l, 10, 64)
	if err != nil {
		return nil, fmt.Errorf("newParticipant: strconv.Atoi(idString): %v\n", err)
	}

	return p, nil
}

func handleGivenAnswer(s *Session, p *data.Participant, i int64, r *http.Request, db *data.DB) error {
	answer, err := strconv.Atoi(r.PostFormValue("answer"))
	if err != nil {
		return fmt.Errorf("handleGivenAnswer: strconv.Atoi(): %v\n", err)
	}

	if err := db.WriteGivenAnswer(s.Briefing, p, &s.Questions[i], answer); err != nil {
		return fmt.Errorf("handleGivenAnswer: db.WriteGivenAnswer(): %v\n", err)
	}

	return nil
}