package main

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

type JsonHandler func(http.ResponseWriter, *http.Request)

func (h JsonHandler) ServeHTTP(w http.ResponseWriter, req *http.Request) {
	w.Header().Set("Content-Type", "application/json")
	h(w, req)
}

type JSONError struct {
	Reason string `json:"reason"`
}

type JSONMessage struct {
	Message string `json:"message"`
}

func apiInfo(w http.ResponseWriter, req *http.Request) {
	version := struct {
		Version string   `json:"version"`
		Name    string   `json:"name"`
		Routes  []string `json:"routes"`
	}{
		Version: "0.1",
		Name:    "itslog",
		Routes: []string{
			"/api/v0/info/",
			"/api/v0/put/",
		},
	}
	if err := json.NewEncoder(w).Encode(version); err != nil {
		http.Error(w, err.Error(), http.StatusInternalServerError)
	}
}

func put(w http.ResponseWriter, req *http.Request) {
	if req.Method != "POST" {
		b, _ := json.Marshal(JSONError{"supported methods: POST"})
		http.Error(w, string(b), http.StatusMethodNotAllowed)
		return
	}

	message := LogMessage{}
	if err := json.NewDecoder(req.Body).Decode(&message); err != nil {
		b, _ := json.Marshal(JSONError{err.Error()})
		http.Error(w, string(b), http.StatusBadRequest)
		return
	}

	_, err := message.save()
	if err != nil {
		b, _ := json.Marshal(JSONError{err.Error()})
		http.Error(w, string(b), http.StatusMethodNotAllowed)
		return
	}

	if err := json.NewEncoder(w).Encode(JSONMessage{"ok"}); err != nil {
		http.Error(w, err.Error(), http.StatusInternalServerError)
	}
}