package web

import (
	"context"
	"encoding/json"
	"log"
	"net/http"
	"strconv"
)

// Server will respond with an expected struct of information.
// Otherwise will return the correct error status code.
// Client responsibility to check status then unmarshal to
// error response or data
func WriteJSON[T any](w http.ResponseWriter, status int, data T) {
	w.Header().Set("Content-Type", "application/json")
	w.WriteHeader(status)

	if err := json.NewEncoder(w).Encode(data); err != nil {
		log.Printf("JSON encode error %v", err)
	}
}

func userIDFromContext(ctx context.Context) (int64, bool) {
	val := ctx.Value(userIDKey)
	if val == nil {
		return 0, false
	}

	strID, ok := val.(string)
	if !ok {
		return 0, false
	}

	id, err := strconv.ParseInt(strID, 10, 64)
	if err != nil {
		return 0, false
	}

	return id, true
}