package main

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

type Result[T any] struct {
	Code    int    `json:"code"`
	Message string `json:"message"`
	Data    *T     `json:"data,omitempty"`
}

func writeJSON[T any](w http.ResponseWriter, status int, payload Result[T]) {
	w.Header().Set("Content-Type", "application/json; charset=utf-8")
	w.WriteHeader(status)
	json.NewEncoder(w).Encode(payload)
}

func ok[T any](w http.ResponseWriter, data *T) {
	writeJSON(w, http.StatusOK, Result[T]{Code: 0, Message: "OK", Data: data})
}

func created[T any](w http.ResponseWriter, location string, data *T) {
	w.Header().Set("Location", location)
	writeJSON(w, http.StatusCreated, Result[T]{Code: 0, Message: "Created", Data: data})
}

func fail(w http.ResponseWriter, status int, msg string) {
	writeJSON[any](w, status, Result[any]{Code: status, Message: msg, Data: nil})
}