package sync

import (
	"fmt"
	"path"
	"strings"

	"srs.epita.fr/fic-server/libfic"
	"github.com/julienschmidt/httprouter"
)

func getThemes(i Importer) ([]string, error) {
	var themes []string

	if dirs, err := i.listDir("/"); err != nil {
		return nil, err
	} else {
		for _, dir := range dirs {
			if _, err := i.listDir(dir); err == nil {
				themes = append(themes, dir)
			}
		}
	}

	return themes, nil
}

func getAuthors(i Importer, tname string) ([]string, error) {
	if authors, err := getFileContent(i, path.Join(tname, "AUTHORS.txt")); err != nil {
		return nil, err
	} else {
		return strings.Split(strings.TrimSpace(authors), "\n"), nil
	}
}

func SyncThemes(i Importer) []string {
	var errs []string

	if themes, err := getThemes(i); err != nil {
		errs = append(errs, err.Error())
	} else {
		for _, tname := range themes {
			if authors, err := getAuthors(i, tname); err != nil {
				errs = append(errs, fmt.Sprintf("%q: unable to get AUTHORS: %s", tname, err))
				continue
			} else if theme, err := fic.GetThemeByName(tname); err != nil {
				if _, err := fic.CreateTheme(tname, strings.Join(authors, ", ")); err != nil {
					errs = append(errs, fmt.Sprintf("%q: an error occurs during add: %s", tname, err))
					continue
				}
			} else {
				authors_str := strings.Join(authors, ", ")

				if theme.Name != tname || theme.Authors != authors_str {
					theme.Name = tname
					theme.Authors = authors_str
					if _, err := theme.Update(); err != nil {
						errs = append(errs, fmt.Sprintf("%q: an error occurs during update: %s", tname, err))
						continue
					}
				}
			}
		}
	}

	return errs
}

func ApiListRemoteThemes(_ httprouter.Params, _ []byte) (interface{}, error) {
	return getThemes(GlobalImporter)
}

func ApiGetRemoteTheme(ps httprouter.Params, _ []byte) (interface{}, error) {
	return getAuthors(GlobalImporter, ps.ByName("thid"))
}