package helpers

import (
	"fmt"
	"io"
	"log"
	"os"
	"sync"

	"tea.chunkbyte.com/kato/go-worm/lib/crashlog"
)

var (
	logMu sync.Mutex
	logW  io.Writer = os.Stdout
)

var Log = log.New(&logWriter{}, "", log.Ldate|log.Ltime|log.Lmicroseconds)

type logWriter struct{}

func (logWriter) Write(p []byte) (int, error) {
	logMu.Lock()
	defer logMu.Unlock()
	return logW.Write(p)
}

// SetLogOutput redirects application logging (e.g. after hiding the console).
func SetLogOutput(w io.Writer) {
	logMu.Lock()
	defer logMu.Unlock()
	logW = w
}

// Go runs fn in a goroutine with panic recovery.
func Go(component string, fn func()) {
	go func() {
		defer RecoverLog(component)
		fn()
	}()
}

// RecoverLog logs a recovered panic from a background component.
func RecoverLog(component string) {
	if r := recover(); r != nil {
		detail := fmt.Sprintf("%s: %v", component, r)
		Log.Printf("panic %s", detail)
		crashlog.RecordPanic(detail)
	}
}