package main

import (
    "regexp"
    "reflect"
    "fmt"

    //"github.com/charmbracelet/log"
    "github.com/wader/goutubedl"
)


func fillPlaceholders(input string, videoInfo goutubedl.Info) (output string) {

    re := regexp.MustCompile(`%([^%]+)%`)

    return re.ReplaceAllStringFunc(input, func(match string) string {
        groups := re.FindStringSubmatch(match)
        if len(groups) < 1 {
            // No capture group found; return original match
            return match
        }
        key := groups[1] // the captured part

        v := reflect.ValueOf(videoInfo)
        if v.Kind() == reflect.Struct {
            fieldVal := v.FieldByName(key)
            if fieldVal.IsValid() && fieldVal.CanInterface() {
                // Haha cheating :)
                if fieldVal.Kind() == reflect.Float64 {
                    return fmt.Sprintf("%v", int(fieldVal.Float()))
                } else {
                    return fmt.Sprintf("%v", fieldVal.Interface())
                }
            }
        }

        // Value not found; return original match
        return match
    })

}