package session

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

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

func (mux *Mux) handleParticipants(db *data.DB, cp <-chan *data.Participant, s *Session) {
	for p := range cp {
		sessionParticipant := new(SessionParticipant)
		sessionParticipant.Participant = p
		sessionParticipant.GivenAnswers = make([]int, len(s.Questions))

		mux.HandleFunc("/submit-participant/"+fmt.Sprint(s.ID)+"/"+fmt.Sprint(p.Login)+"/", s.HandleParticipant(db, p, &s.Questions))
		var i int
		for i = range s.Questions {
			mux.HandleFunc("/submit-answer/"+fmt.Sprint(s.ID)+"/"+fmt.Sprint(p.Login)+"/"+fmt.Sprint(i+1)+"/", s.HandleAnswer(db, sessionParticipant, &s.Questions, int64(i+1)))
		}
		mux.HandleFunc("/retry/"+fmt.Sprint(s.ID)+"/"+fmt.Sprint(p.Login)+"/", s.HandleRetry(p, &s.Questions, &i))
	}
}

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

	p.GivenAnswers[i] = answer
	return nil
}

func makeHTMLQuestions(sq []data.Question, givenAnswers []int) []htmlQuestion {
	questions := make([]htmlQuestion, 0)
	for i, q := range sq {
		question := new(htmlQuestion)
		question.Text = q.Text

		question.Answers = make([]htmlAnswer, 0)
		for j, a := range q.Answers {
			answer := new(htmlAnswer)
			answer.Text = a.Text

			if j+1 == q.Correct {
				answer.Correct = true
			} else {
				answer.Correct = false
			}

			if j+1 == givenAnswers[i] {
				answer.Chosen = true
			} else {
				answer.Chosen = false
			}
			question.Answers = append(question.Answers, *answer)
		}
		questions = append(questions, *question)
	}

	return questions
}