package log

import (
	"fmt"
	"runtime"
	"text/template"
)

func caller(depth int) string {
	_, file, line, _ := runtime.Caller(depth)
	short := file
	for i := len(file) - 1; i > 0; i-- {
		if file[i] == '/' {
			short = file[i+1:]
			break
		}
	}
	return fmt.Sprintf("%s:%d", short, line)
}

func stack() string {
	buf := make([]byte, 1024)
	for {
		n := runtime.Stack(buf, false)
		if n < len(buf) {
			return string(buf[:n])
		}
		buf = make([]byte, 2*len(buf))
	}
}

func getAllOffsprings(l *Logger) []*Logger {
	if l.subs == nil || len(l.subs) == 0 {
		return []*Logger{l}
	}
	loggers := []*Logger{}
	for i := range l.subs {
		loggers = append(loggers, getAllOffsprings(l.subs[i])...)
	}
	return loggers
}

func copyFuncMap(source template.FuncMap) template.FuncMap {
	dest := template.FuncMap{}
	for k, v := range source {
		dest[k] = v
	}
	return dest
}