// Package logx is a small leveled logger. torly avoids the standard log
// package so that the output format is identical on every target TinyGo
// supports and nothing depends on log flags or output redirection.
package logx

import (
	"fmt"
	"os"
	"sync"
	"time"
)

// Level is a logging threshold.
type Level int

const (
	LevelError Level = iota
	LevelWarn
	LevelInfo
	LevelDebug
)

var (
	mu    sync.Mutex
	level = LevelInfo
)

// SetLevel sets the threshold from a name.
func SetLevel(s string) {
	switch s {
	case "error":
		level = LevelError
	case "warn", "warning":
		level = LevelWarn
	case "debug":
		level = LevelDebug
	default:
		level = LevelInfo
	}
}

func logf(l Level, tag, format string, args ...any) {
	if l > level {
		return
	}
	mu.Lock()
	defer mu.Unlock()
	ts := time.Now().Format("2006-01-02T15:04:05Z07:00")
	fmt.Fprintf(os.Stderr, "%s %s %s\n", ts, tag, fmt.Sprintf(format, args...))
}

// Errorf logs at error level.
func Errorf(format string, args ...any) { logf(LevelError, "ERROR", format, args...) }

// Warnf logs at warn level.
func Warnf(format string, args ...any) { logf(LevelWarn, "WARN", format, args...) }

// Infof logs at info level.
func Infof(format string, args ...any) { logf(LevelInfo, "INFO", format, args...) }

// Debugf logs at debug level.
func Debugf(format string, args ...any) { logf(LevelDebug, "DEBUG", format, args...) }