package main

import (
	"encoding/json"
	"errors"
	"fmt"
	"io/ioutil"
	"log"
	"os"
	"path"

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

// Check if the challenge is started or not
func isStarted() bool {
	if _, err := os.Stat(path.Join(SubmissionDir, "started")); os.IsNotExist(err) {
		return false
	}
	return true
}

// Generate my.json and wait.json for a given 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(fmt.Sprintf("%s is not a directory", dirPath))
	}

	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
	}

	// Speed up generation when challenge is started
	if !isStarted() {
		if my, err := fic.MyJSONTeam(&team, false); err != nil {
			return err
		} else if j, err := json.Marshal(my); err != nil {
			return err
		} else if err := ioutil.WriteFile(path.Join(dirPath, "wait.json"), j, 0666); err != nil {
			return err
		}
	}

	return nil
}

// Generate public my.json file
func genMyPublicFile() error {
	dirPath := path.Join(TeamsDir, "public")

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

	if my, err := fic.MyJSONTeam(nil, 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
	}

	os.Symlink("my.json", path.Join(dirPath, "wait.json"))

	return nil
}

// Generate general evemts.json file
func genEventsFile() error {
	if evts, err := fic.GetLastEvents(); err != nil {
		return err
	} else if j, err := json.Marshal(evts); err != nil {
		return err
	} else if err := ioutil.WriteFile(path.Join(TeamsDir, "events.json"), j, 0666); err != nil {
		return err
	}

	return nil
}

// Generate general teams.json file
func genTeamsFile() error {
	if teams, err := fic.ExportTeams(); err != nil {
		return err
	} else if j, err := json.Marshal(teams); err != nil {
		return err
	} else if err := ioutil.WriteFile(path.Join(TeamsDir, "teams.json"), j, 0666); err != nil {
		return err
	}

	return nil
}

// Generate general themes.json file
func genThemesFile() error {
	if themes, err := fic.ExportThemes(); err != nil {
		return err
	} else if j, err := json.Marshal(themes); err != nil {
		return err
	} else if err := ioutil.WriteFile(path.Join(TeamsDir, "themes.json"), j, 0666); err != nil {
		return err
	}

	return nil
}

func genTeamAll(team fic.Team) {
	if err := genThemesFile(); err != nil {
		log.Println("themes.json generation error: ", err)
	} else if err := genTeamsFile(); err != nil {
		log.Println("teams.json generation error: ", err)
	} else if err := genTeamMyFile(team); err != nil {
		log.Println("my.json(", team.Id, ") generation error: ", err)
	}
}

func genAll() {
	if err := genThemesFile(); err != nil {
		log.Println("themes.json generation error: ", err)
	} else if err := genTeamsFile(); err != nil {
		log.Println("teams.json generation error: ", err)
	} else if err := genEventsFile(); err != nil {
		log.Println("events.json generation error: ", err)
	} else if err := genMyPublicFile(); err != nil {
		log.Println("MyPublic generation error: ", err)
	} else if teams, err := fic.GetTeams(); err != nil {
		log.Println("Team retrieval error: ", err)
	} else {
		for _, team := range(teams) {
			if err := genTeamMyFile(team); err != nil {
				log.Println("Team generation error: ", err)
			}
		}
	}
}