package v1

import (
	"database/sql"
	"encoding/json"
	"net/http"
	"strconv"

	"github.com/gorilla/mux"
)

func RegisterCharactersRoutes(r *mux.Router) {
	r.HandleFunc("/characters", resolveCharacters).Methods("GET", "OPTIONS", "POST")
	r.HandleFunc("/characters/{id:[0-9]+}", resolveCharacter).Methods("GET", "OPTIONS", "PUT", "DELETE")
	r.HandleFunc("/characters/{id:[0-9]+}/novels", resolveCharacterNovels).Methods("GET", "OPTIONS")
}

func resolveCharacters(w http.ResponseWriter, r *http.Request) {
	if r.Method == http.MethodGet {
		characters, err := FetchCharacters()
		Response(w, err, characters)
	} else if r.Method == http.MethodPost {
		Response(w, nil, "todo")
	}
}

func resolveCharacter(w http.ResponseWriter, r *http.Request) {
	vars := mux.Vars(r)
	id, _ := strconv.Atoi(vars["id"])

	if r.Method == http.MethodGet {
		char, err := FetchCharacter(id)
		Response(w, err, char)
	} else if r.Method == http.MethodPut {
		user, err := FetchCurrentUser(r)
		if err != nil {
			NoAccess.Ferror(w)
			return
		}

		hasPerm := hasPermission(user, "characters")
		if !hasPerm {
			NoAccess.Ferror(w)
			return
		}

		body, err := ReadBody(r)
		if err != nil {
			Error(w, err)
			return
		}
		character := new(Character)
		err = json.Unmarshal(body, character)
		if err != nil {
			Error(w, err)
			return
		}

		character, err = UpdateCharacter(character)
		Response(w, err, character)
	} else if r.Method == http.MethodDelete {
		user, err := FetchCurrentUser(r)
		if err != nil {
			NoAccess.Ferror(w)
			return
		}

		hasPerm := hasPermission(user, "characters")
		if !hasPerm {
			NoAccess.Ferror(w)
			return
		}

		err = DeleteCharacter(id)
		if err == sql.ErrNoRows {
			NotFound.Ferror(w)
			return
		}
		Response(w, err, "ok")
	}
}

func resolveCharacterNovels(w http.ResponseWriter, r *http.Request) {
	vars := mux.Vars(r)
	id, _ := strconv.Atoi(vars["id"])
	novels, err := FetchCharacterNovels(id)
	Response(w, err, novels)
}