package util

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

// must panics if err is not nil
func must[T any](t T, err error) T {
	if err != nil {
		panic(err)
	}
	return t
}

// attempt discards the value from a (value, err) function
func attempt[T any](_ T, err error) error {
	return err
}

// try discards the error from a (value, err) function
func try[T any](t T, _ error) T {
	return t
}

// writeJSON encodes the provided value as json and responds 200
func writeJSON(w http.ResponseWriter, v any) {
	w.Header().Set("Content-Type", "application/json")
	if err := json.NewEncoder(w).Encode(v); err != nil {
		log.Printf("writeJSON error: %v", err)
	}
}

// writeError logs and responds with the given formatted error message as `{"error": msg}`
func writeError(w http.ResponseWriter, code int, msg string, args ...any) {
	errMsg := fmt.Sprintf(msg, args...)
	log.Println(errMsg)
	w.Header().Set("Content-Type", "application/json")
	w.WriteHeader(code)
	json.NewEncoder(w).Encode(struct {
		Error string `json:"error"`
	}{
		Error: errMsg,
	})
}