/*
 * Sicherheitsunterweisung
 * Copyright (C) 2023  Jason Streifling
 *
 * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

package session

import (
	"crypto/rand"
	"encoding/hex"
	"fmt"
	"log"
	"net/http"
	"strconv"
	"strings"

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

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

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

	return hex.EncodeToString(bs), nil
}

func findCorrectLogin(l string, ss *[]*Session) (*Session, *BriefingParticipant, 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("error: newParticipant: strconv.Atoi(): %v", err)
	}

	return p, nil
}

func handleGivenAnswer(p *BriefingParticipant, i int64, r *http.Request) error {
	answer, err := strconv.Atoi(r.PostFormValue("answer"))
	if err != nil {
		return fmt.Errorf("error: handleGivenAnswer: strconv.Atoi(): %v", err)
	}

	p.GivenAnswers[i] = answer
	return nil
}

func makeHTMLQuestions(sq []data.Question, givenAnswers []int) []resultQuestion {
	questions := make([]resultQuestion, len(sq))
	for i, q := range sq {
		questions[i].Text = q.Text
		questions[i].Answers = make([]resultAnswer, len(q.Answers))

		for j := range q.Answers {
			questions[i].Answers[j].ID = q.Answers[j].ID
			questions[i].Answers[j].Text = q.Answers[j].Text
			questions[i].Answers[j].IsImage = q.Answers[j].IsImage

			if j+1 == q.Correct {
				questions[i].Answers[j].Correct = true
			} else {
				questions[i].Answers[j].Correct = false
			}

			if j+1 == givenAnswers[i] {
				questions[i].Answers[j].Chosen = true
			} else {
				questions[i].Answers[j].Chosen = false
			}
		}
	}

	return questions
}

func (s *Session) getQuestions(db *data.DB) {
	questionIDs := make([]string, 4)

	for i := 0; i < len(questionIDs); i++ {
		questionIDs[i] = fmt.Sprint(i + 1)
	}

	var err error
	s.Questions, err = db.GetQuestions(questionIDs)
	if err != nil {
		log.Fatalln(err)
	}

	// TODO: ggf. weniger komplex durch Pointer machen
	for i := range s.Questions {
		for j := range s.Questions[i].Answers {
			if parts := strings.Split(s.Questions[i].Answers[j].Text, ":/"); parts[0] == "file" {
				s.Questions[i].Answers[j].Text = parts[1]
				s.Questions[i].Answers[j].IsImage = true
			} else {
				s.Questions[i].Answers[j].IsImage = false
			}
		}
	}
}