package zlog

import (
	"log/slog"
	"os"
	"runtime"
	"strings"

	"gitlab.bareksa.com/backend/zen/core/zcaller"
)

// Caller represents the caller of a function.
//
// It gives helper methods to get the caller's information.
type Caller uintptr

func (ca Caller) LogValue() slog.Value {
	if ca == 0 {
		return slog.AnyValue(nil)
	}

	f := frame{ca.Frame()}

	return slog.GroupValue(
		slog.String("file", f.ShortFile()),
		slog.Int("line", f.Line),
		slog.String("function", f.ShortFunction()),
	)
}

func (ca Caller) Frame() runtime.Frame {
	return zcaller.Frame(uintptr(ca))
}

type frame struct {
	runtime.Frame
}

func (f frame) ShortFile() string {
	wd, err := os.Getwd()
	if err != nil {
		return f.File
	}
	if after, found := strings.CutPrefix(f.File, wd); found {
		return strings.TrimPrefix(after, string(os.PathSeparator))
	}
	return f.File
}

func (f frame) ShortFunction() string {
	split := strings.Split(f.Function, string(os.PathSeparator))
	return split[len(split)-1]
}