package main

import (
	"encoding/json"
	"fmt"
	"log"
	"net/http"
)

type NewMemoResponse struct {
	ID int64 `json:"ID"`
}

func httpGetMemos(w http.ResponseWriter, r *http.Request) {
	memos := getMemos(DB)
	w.Header().Set("Content-Type", "application/json")
	err := json.NewEncoder(w).Encode(memos)
	if err != nil {
		log.Fatal(err)
	}
}

func httpCreateMemo(w http.ResponseWriter, r *http.Request) {
	if err := r.ParseForm(); err != nil {
		w.WriteHeader(400)
		fmt.Fprintf(w, "ParseForm() err: %v", err)
		return
	}
	message := r.FormValue("message")
	if len(message) == 0 {
		w.Header().Set("Content-Type", "application/json")
		w.WriteHeader(422)
		json.NewEncoder(w).Encode(ErrorResponse{"Memo must have a Message"})
		return
	}
	id := insertMemo(DB, message)
	w.Header().Set("Content-Type", "application/json")
	json.NewEncoder(w).Encode(NewMemoResponse{id})
}

func memosEndpoint(w http.ResponseWriter, r *http.Request) {
	switch r.Method {
	case "GET":
		httpGetMemos(w, r)
	case "POST":
		httpCreateMemo(w, r)
	default:
		w.WriteHeader(405)
		fmt.Fprintf(w, "HTTP method must be GET or POST")
	}
}