package settings

import (
	"encoding/json"
	"os"
)

// ChallengeFile is the expected name of the file containing the challenge infos.
const ChallengeFile = "challenge.json"

// ChallengeInfo stores common descriptions and informations about the challenge.
type ChallengeInfo struct {
	// Title is the displayed name of the challenge.
	Title string `json:"title"`
	// Authors is the group name of people making the challenge.
	Authors string `json:"authors"`
	// VideoLink is the link to explaination videos when the challenge is over.
	VideosLink string `json:"videoslink"`

	// Description gives an overview of the challenge.
	Description string `json:"description"`
	// Rules tell the player some help.
	Rules string `json:"rules"`
	// YourMission is a small introduction to understand the goals.
	YourMission string `json:"your_mission"`
}

// ReadChallenge parses the file at the given location.
func ReadChallengeInfo(path string) (*ChallengeInfo, error) {
	var s ChallengeInfo
	if fd, err := os.Open(path); err != nil {
		return nil, err
	} else {
		defer fd.Close()
		jdec := json.NewDecoder(fd)

		if err := jdec.Decode(&s); err != nil {
			return &s, err
		}

		return &s, nil
	}
}

// SaveChallenge saves challenge at the given location.
func SaveChallengeInfo(path string, s *ChallengeInfo) error {
	if fd, err := os.Create(path); err != nil {
		return err
	} else {
		defer fd.Close()
		jenc := json.NewEncoder(fd)

		if err := jenc.Encode(s); err != nil {
			return err
		}

		return nil
	}
}