/*
 * 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 server

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

	"github.com/google/uuid"
	"streifling.com/jason/sicherheitsunterweisung/packages/data"
)

type Briefing struct {
	*data.Briefing
	UUID         uuid.UUID
	Participants []*Participant
	Questions    []data.Question
}

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 (b *Briefing) handleNewParticipant(cp chan<- *Participant) http.HandlerFunc {
	return func(w http.ResponseWriter, r *http.Request) {
		var err error
		participant := Participant{
			Participant: new(data.Participant),
			NoIncorrect: -1,
			AllowRetry:  false,
		}

		participant.Login, err = generateLogin()
		if err != nil {
			http.Error(w, err.Error(), http.StatusInternalServerError)
			log.Panicln(err)
		}
		b.Participants = append(b.Participants, &participant)
		cp <- &participant

		data := participantHTMLData{
			BriefingID:  b.UUID,
			Participant: Participant{Login: participant.Login},
		}

		template.Must(template.ParseFiles("templates/briefing.html")).ExecuteTemplate(w, "new", data)
	}
}

func (b *Briefing) handleBriefingForm(db *data.DB, s *Session) http.HandlerFunc {
	return func(w http.ResponseWriter, r *http.Request) {
		b.DateTime = time.Now().Format("2006-01-02 15:04:05")
		b.Location = r.PostFormValue("location")
		b.Document = r.PostFormValue("document")
		b.AsOf = r.PostFormValue("as-of")

		err := db.WriteBriefing(b.Briefing)
		if err != nil {
			http.Error(w, err.Error(), http.StatusInternalServerError)
			log.Panicln(err)
		}

		data := summaryHTMLData{
			SessionID:        s.UUID,
			BriefingID:       b.UUID,
			ParticipantsData: make([]participantHTMLData, len(b.Participants)),
		}
		for i, p := range b.Participants {
			data.ParticipantsData[i].BriefingID = b.UUID
			data.ParticipantsData[i].Participant = *p
		}

		template.Must(template.ParseFiles("templates/summary.html")).ExecuteTemplate(w, "content", data)
	}
}