package api

import (
	"encoding/json"
	"errors"
	"fmt"
	"strconv"

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

func init() {
	router.Path("/themes/").Methods("GET").HandlerFunc(apiHandler(listThemes))
	router.Path("/themes/").Methods("POST").HandlerFunc(apiHandler(createTheme))
	router.Path("/themes.json").Methods("GET").HandlerFunc(apiHandler(exportThemes))
	router.Path("/themes/files-bindings").Methods("GET").HandlerFunc(apiHandler(bindingFiles))

	rt := router.PathPrefix("/themes/{tid:[0-9]+}").Subrouter()
	rt.Path("/").Methods("GET").HandlerFunc(apiHandler(themeHandler(showTheme)))
	rt.Path("/").Methods("PUT").HandlerFunc(apiHandler(themeHandler(updateTheme)))
	rt.Path("/").Methods("DELETE").HandlerFunc(apiHandler(themeHandler(deleteTheme)))

	rtes := rt.PathPrefix("/exercices").Subrouter()
	rtes.Path("/").Methods("GET").HandlerFunc(apiHandler(themeHandler(listThemedExercices)))
	rtes.Path("/").Methods("POST").HandlerFunc(apiHandler(themeHandler(createExercice)))

	rte := rtes.PathPrefix("/{eid:[0-9]+}").Subrouter()
	rte.Path("/").Methods("GET").HandlerFunc(apiHandler(themeHandler(themedExerciceHandler(showThemedExercice))))
	rte.Path("/").Methods("PUT").HandlerFunc(apiHandler(themeHandler(themedExerciceHandler(updateThemedExercice))))
	rte.Path("/").Methods("DELETE").HandlerFunc(apiHandler(themeHandler(themedExerciceHandler(deleteThemedExercice))))

	rtef := rte.Path("/files").Subrouter()
	rtef.Methods("GET").HandlerFunc(apiHandler(themeHandler(themedExerciceHandler(listThemedExerciceFiles))))
	rtef.Methods("POST").HandlerFunc(apiHandler(themeHandler(themedExerciceHandler(createExerciceFile))))

	rteh := rte.Path("/hints").Subrouter()
	rteh.Methods("GET").HandlerFunc(apiHandler(themeHandler(themedExerciceHandler(listThemedExerciceHints))))
	rteh.Methods("POST").HandlerFunc(apiHandler(themeHandler(themedExerciceHandler(createExerciceHint))))

	rtek := rte.Path("/keys").Subrouter()
	rtek.Methods("GET").HandlerFunc(apiHandler(themeHandler(themedExerciceHandler(listThemedExerciceKeys))))
	rtek.Methods("POST").HandlerFunc(apiHandler(themeHandler(themedExerciceHandler(createExerciceKey))))
}

func bindingFiles(args map[string]string, body []byte) (interface{}, error) {
	if files, err := fic.GetFiles(); err != nil {
		return "", err
        } else {
	        ret := ""
	        for _, file := range files {
			ret += fmt.Sprintf("%s;%s\n", file.GetOrigin(), file.Path)
		}
		return ret, nil
	}
}

func getExercice(args []string) (fic.Exercice, error) {
	if tid, err := strconv.Atoi(string(args[0])); err != nil {
		return fic.Exercice{}, err
	} else if theme, err := fic.GetTheme(tid); err != nil {
		return fic.Exercice{}, err
	} else if eid, err := strconv.Atoi(string(args[1])); err != nil {
		return fic.Exercice{}, err
	} else {
		return theme.GetExercice(eid)
	}
}

func listThemes(args map[string]string, body []byte) (interface{}, error) {
	return fic.GetThemes()
}

func exportThemes(args map[string]string, body []byte) (interface{}, error) {
	return fic.ExportThemes()
}

func showTheme(theme fic.Theme, args map[string]string, body []byte) (interface{}, error) {
	return theme, nil
}

func listThemedExercices(theme fic.Theme, args map[string]string, body []byte) (interface{}, error) {
	return theme.GetExercices()
}

func showThemedExercice(theme fic.Theme, exercice fic.Exercice, args map[string]string, body []byte) (interface{}, error) {
	return exercice, nil
}

func listThemedExerciceFiles(theme fic.Theme, exercice fic.Exercice, args map[string]string, body []byte) (interface{}, error) {
	return exercice.GetFiles()
}

func listThemedExerciceHints(theme fic.Theme, exercice fic.Exercice, args map[string]string, body []byte) (interface{}, error) {
	return exercice.GetHints()
}

func listThemedExerciceKeys(theme fic.Theme, exercice fic.Exercice, args map[string]string, body []byte) (interface{}, error) {
	return exercice.GetKeys()
}


type uploadedTheme struct {
	Name    string
	Authors string
}

func createTheme(args map[string]string, body []byte) (interface{}, error) {
	var ut uploadedTheme
	if err := json.Unmarshal(body, &ut); err != nil {
		return nil, err
	}

	if len(ut.Name) == 0 {
		return nil, errors.New("Theme's name not filled")
	}

	return fic.CreateTheme(ut.Name, ut.Authors)
}

func updateTheme(theme fic.Theme, args map[string]string, body []byte) (interface{}, error) {
	var ut fic.Theme
	if err := json.Unmarshal(body, &ut); err != nil {
		return nil, err
	}

	ut.Id = theme.Id

	if len(ut.Name) == 0 {
		return nil, errors.New("Theme's name not filled")
	}

	return ut.Update()
}

func updateThemedExercice(theme fic.Theme, exercice fic.Exercice, args map[string]string, body []byte) (interface{}, error) {
	// Update an exercice
	var ue fic.Exercice
	if err := json.Unmarshal(body, &ue); err != nil {
		return nil, err
	}

	ue.Id = exercice.Id

	if len(ue.Title) == 0 {
		return nil, errors.New("Exercice's title not filled")
	}

	if _, err := ue.Update(); err != nil {
		return nil, err
	}

	return ue, nil
}

func deleteTheme(theme fic.Theme, args map[string]string, body []byte) (interface{}, error) {
	return theme.Delete()
}

func deleteThemedExercice(theme fic.Theme, exercice fic.Exercice, args map[string]string, body []byte) (interface{}, error) {
	return exercice.Delete()
}