package config

import (
	"errors"
	"fmt"
	"os"
	"path/filepath"
	"strings"

	"go.wit.com/lib/ENV"
	"google.golang.org/protobuf/proto"
)

// loads foo.proto from ~/.config/<appname>/foo.text
func LoadConfigDir(pb proto.Message) error {
	appname, err := ENV.GetAppname() // already configured by your application
	if err != nil {
		return err
	}
	protoname, err := GetProtobufName(pb) // defined in the foo.proto file
	if err != nil {
		return err
	}

	curfilename, err := GetFilename(pb)
	if err == nil {
		return err
	}

	// Get ~/.config/appname/protoname.text
	fullname := MakeConfigFilename(appname, protoname)

	if err = loadTEXT(pb, fullname); err == nil {
		// If the config is old or broken, this sets the filename
		if curfilename != fullname {
			_, err := SetFilename(pb, fullname)
			if err != nil {
				fmt.Println("FILENAME COULD NOT BE SET old=", curfilename)
				fmt.Println("FILENAME COULD NOT BE SET new=", fullname)
				return errors.Join(err, errors.New("something is wrong in lib/config"))
			}
		}
		return nil
	} else {
		if strings.HasSuffix(fullname, ".text") {
			fulljson := fullname + ".json"
			// If the config is old or broken, this sets the filename
			if err := loadJSON(pb, fulljson); err == nil {
				if curfilename != fullname {
					_, err := SetFilename(pb, fullname)
					if err != nil {
						fmt.Println("FILENAME COULD NOT BE SET old=", curfilename)
						fmt.Println("FILENAME COULD NOT BE SET new=", fullname)
						return errors.Join(err, errors.New("something is wrong in lib/config"))
					}
				}
				return nil
			}
		}
	}
	return ErrMarshal
}

func LoadConfigPB(pb proto.Message, appname string, protoname string) (string, error) {
	var fullname string
	if strings.HasPrefix(appname, "/") {
		fullname = filepath.Join(appname, protoname+".pb")
	} else {
		configDir, err := os.UserConfigDir()
		if err != nil {
			return "", err
		}

		fullname = filepath.Join(configDir, appname, protoname+".pb")
	}

	data, err := loadFile(fullname)
	if err != nil {
		return fullname, err
	}

	// Unmarshal()
	if err = proto.Unmarshal(data, pb); err != nil {
		return fullname, err
	}

	return fullname, nil
}