package main

import (
	"encoding/json"
	"io/ioutil"
	"net/http"

	"git.andreafazzi.eu/andrea/probo/client"
	"git.andreafazzi.eu/andrea/probo/logger"
	"git.andreafazzi.eu/andrea/probo/models"
	"git.andreafazzi.eu/andrea/probo/store"
	"github.com/julienschmidt/httprouter"
)

type ProboCollectorServer struct {
	store store.ProboCollectorStore
	http.Handler
}

func NewProboCollectorServer(store store.ProboCollectorStore) *ProboCollectorServer {
	ps := new(ProboCollectorServer)
	ps.store = store

	router := httprouter.New()

	router.GET("/quizzes", httprouter.Handle(ps.readAllQuizzesHandler))
	router.POST("/quizzes/create", httprouter.Handle(ps.createQuizHandler))
	router.PUT("/quizzes/update/:id", httprouter.Handle(ps.updateQuizHandler))

	ps.Handler = logger.WithLogging(ps.jsonHeaderMiddleware(router))

	return ps
}

func (ps *ProboCollectorServer) jsonHeaderMiddleware(next http.Handler) http.Handler {
	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		w.Header().Add("Content-Type", "application/json")
		next.ServeHTTP(w, r)
	})
}

func (ps *ProboCollectorServer) readAllQuizzesHandler(w http.ResponseWriter, r *http.Request, params httprouter.Params) {
	response := new(client.ReadAllQuizResponse)

	quizzes, err := ps.readAllQuiz(w, r)
	if err != nil {
		response = &client.ReadAllQuizResponse{
			BaseResponse: client.BaseResponse{Status: "error", Message: err.Error()},
			Content:      nil,
		}
	} else {
		response = &client.ReadAllQuizResponse{
			BaseResponse: client.BaseResponse{Status: "success", Message: ""},
			Content:      quizzes,
		}
	}

	w.WriteHeader(http.StatusOK)
	json.NewEncoder(w).Encode(response)
}

func (ps *ProboCollectorServer) createQuizHandler(w http.ResponseWriter, r *http.Request, params httprouter.Params) {
	response := new(client.CreateQuizResponse)

	quiz, err := ps.createQuiz(w, r)
	if err != nil {
		response = &client.CreateQuizResponse{
			BaseResponse: client.BaseResponse{Status: "error", Message: err.Error()},
			Content:      nil,
		}
	}

	response = &client.CreateQuizResponse{
		BaseResponse: client.BaseResponse{Status: "success", Message: ""},
		Content:      quiz,
	}

	w.WriteHeader(http.StatusAccepted)
	json.NewEncoder(w).Encode(response)
}

func (ps *ProboCollectorServer) updateQuizHandler(w http.ResponseWriter, r *http.Request, params httprouter.Params) {
	response := new(client.UpdateQuizResponse)

	quiz, err := ps.updateQuiz(w, r, params.ByName("id"))
	if err != nil {
		response = &client.UpdateQuizResponse{
			BaseResponse: client.BaseResponse{Status: "error", Message: err.Error()},
			Content:      nil,
		}
	} else {
		response = &client.UpdateQuizResponse{
			BaseResponse: client.BaseResponse{Status: "success", Message: ""},
			Content:      quiz,
		}
	}

	w.WriteHeader(http.StatusAccepted)
	json.NewEncoder(w).Encode(response)
}

func (ps *ProboCollectorServer) readAllQuiz(w http.ResponseWriter, r *http.Request) ([]*models.Quiz, error) {
	quizzes, err := ps.store.ReadAllQuizzes()
	if err != nil {
		return nil, err
	}
	return quizzes, nil
}

func (ps *ProboCollectorServer) updateQuiz(w http.ResponseWriter, r *http.Request, id string) (*models.Quiz, error) {
	body, err := ioutil.ReadAll(r.Body)
	if err != nil {
		return nil, err
	}

	updateQuizReq := new(client.CreateUpdateQuizRequest)

	err = json.Unmarshal(body, &updateQuizReq)
	if err != nil {
		return nil, err
	}

	updatedQuiz, err := ps.store.UpdateQuiz(updateQuizReq, id)
	if err != nil {
		return nil, err
	}

	return updatedQuiz, nil
}

func (ps *ProboCollectorServer) createQuiz(w http.ResponseWriter, r *http.Request) (*models.Quiz, error) {
	body, err := ioutil.ReadAll(r.Body)
	if err != nil {
		return nil, err
	}

	createQuizReq := new(client.CreateUpdateQuizRequest)

	err = json.Unmarshal(body, &createQuizReq)
	if err != nil {
		return nil, err
	}

	createdQuiz, err := ps.store.CreateQuiz(createQuizReq)
	if err != nil {
		return nil, err
	}

	return createdQuiz, nil
}