package main

import (
	"encoding/base64"
	"encoding/binary"
	"encoding/json"
	"errors"
	"fmt"
	"io/ioutil"
	"log"
	"math/rand"
	"os"
	"path"
	"regexp"
	"strconv"

	"srs.epita.fr/fic-server/libfic"
)

func treatSubmission(pathname string, team_id string, exercice_id string) {
	bid := make([]byte, 5)
	binary.LittleEndian.PutUint32(bid, rand.Uint32())
	id := "[" + base64.StdEncoding.EncodeToString(bid) + "]"
	log.Println(id, "New submission receive", pathname)

	var keys map[string]string

	if tid, err := strconv.Atoi(team_id); err != nil {
		log.Println(id, "[ERR]", err)
	} else if team, err := fic.GetTeam(tid); err != nil {
		log.Println(id, "[ERR]", err)
	} else if cnt_raw, err := ioutil.ReadFile(pathname); err != nil {
		log.Println(id, "[ERR]", err)
	} else if err := json.Unmarshal(cnt_raw, &keys); err != nil {
		log.Println(id, "[ERR]", err)
	} else if exercice_id == "name" {
		if match, err := regexp.MatchString("^[A-Za-z0-9 àéèêëîïôùûü_-]{1,32}$", keys["newName"]); err == nil && match {
			team.Name = keys["newName"]
			if _, err := team.Update(); err != nil {
				log.Println(id, "[WRN] Unable to change team name:", err)
			}
			genTeamMyFile(team)
		}
		if err := os.Remove(pathname); err != nil {
			log.Println(id, "[ERR]", err)
		}
	} else if eid, err := strconv.Atoi(exercice_id); err != nil {
		log.Println(id, "[ERR]", err)
	} else if exercice, err := fic.GetExercice(eid); err != nil {
		log.Println(id, "[ERR]", err)
	} else if theme, err := exercice.GetTheme(); err != nil {
		log.Println(id, "[ERR]", err)
	} else {
		if solved, err := exercice.CheckResponse(keys, team); err != nil {
			log.Println(id, "[ERR]", err)
		} else if solved {
			exercice.Solved(team)
			log.Printf("%s Team %d SOLVED exercice %d (%s : %s)\n", id, team.Id, exercice.Id, theme.Name, exercice.Title)
			if err := os.Remove(pathname); err != nil {
				log.Println(id, "[ERR]", err)
			}
		} else {
			log.Printf("%s Team %d submit an invalid solution for exercice %d (%s : %s)\n", id, team.Id, exercice.Id, theme.Name, exercice.Title)
			if err := os.Remove(pathname); err != nil {
				log.Println(id, "[ERR]", err)
			}
		}
		genTeamMyFile(team)
	}
}

func genTeamMyFile(team fic.Team) error {
	dirPath := path.Join(TeamsDir, fmt.Sprintf("%d", team.Id))

	if s, err := os.Stat(dirPath); os.IsNotExist(err) {
		os.MkdirAll(dirPath, 0777)
	} else if !s.IsDir() {
		return errors.New("dirPath is not a directory")
	}

	if my, err := fic.MyJSONTeam(&team, true); err != nil {
		return err
	} else if j, err := json.Marshal(my); err != nil {
		return err
	} else if err := ioutil.WriteFile(path.Join(dirPath, "my.json"), j, 0666); err != nil {
		return err
	}

	return nil
}