package nlog

import (
	"context"
	"fmt"
	"go.opentelemetry.io/otel/trace"
	"runtime"
	"strings"
	"time"
)

func spanIDFromContext(ctx context.Context) string {
	spanCtx := trace.SpanContextFromContext(ctx)
	if spanCtx.HasSpanID() {
		return spanCtx.SpanID().String()
	}

	return ""
}

func traceIDFromContext(ctx context.Context) string {
	spanCtx := trace.SpanContextFromContext(ctx)
	if spanCtx.HasTraceID() {
		return spanCtx.TraceID().String()
	}

	return ""
}

func getCaller(callDepth int) string {
	_, file, line, ok := runtime.Caller(callDepth)
	if !ok {
		return ""
	}

	return prettyCaller(file, line)
}

func getTimestamp() string {
	return time.Now().Format(timeFormat)
}

func prettyCaller(file string, line int) string {
	idx := strings.LastIndexByte(file, '/')
	if idx < 0 {
		return fmt.Sprintf("%s:%d", file, line)
	}

	idx = strings.LastIndexByte(file[:idx], '/')
	if idx < 0 {
		return fmt.Sprintf("%s:%d", file, line)
	}

	return fmt.Sprintf("%s:%d", file[idx+1:], line)
}