package gitpb

// functions to import and export the protobuf
// data to and from config files

import (
	"errors"
	"os"
	"path/filepath"
	"time"

	"go.wit.com/lib/config"
	"go.wit.com/lib/protobuf/bugpb"
	"go.wit.com/log"
)

var globalChanged bool
var globalReason string

func (all *Repos) SmartSave() error {
	if !globalChanged {
		return nil
	}
	log.Info("saved because", globalReason)
	globalChanged = false
	globalReason = ""
	return all.Save()
}

// write the repos.pb file
func (all *Repos) ConfigSave(fname string) error {
	if all == nil {
		log.Warn("gitpb repos == nil")
		return errors.New("gitpb.ConfigSave() repos == nil")
	}

	if _, s := filepath.Split(fname); s != "repos.pb" {
		log.Infof("ConfigSave() filename '%s' invalid\n", fname)
		return log.Errorf("ConfigSave() filename '%s' invalid\n", fname)
	}
	return all.SaveValidate(fname)
}

// bypass name check "repos.pb"
func (pb *Repos) SaveValidate(fname string) error {
	if pb.Filename != fname {
		log.Printf("gitpb.Repos.Filename mismatch '%s' != '%s'\n", pb.Filename, fname)
		pb.Filename = fname
		time.Sleep(5 * time.Second)
	}
	data, err := pb.Marshal()
	if err != nil {
		log.Info("gitpb proto.Marshal() failed len", len(data), err)
		// often this is because strings have invalid UTF-8. This should probably be fixed in the protobuf code
		// this might be fixed in the create code, but it can't hurt to try this as a last ditch effort here
		log.Info("gitpb.ConfigSave() ATTEMPTING TO VALIDATE UTF-8 strings in the protobuf file")
		if err := pb.tryValidate(); err != nil {
			log.Info("gitpb.ConfigSave() STILL FAILEd", err)
			return err
		} else {
			// re-attempt Marshal() here
			data, err = pb.Marshal()
			if err == nil {
				// validate & sanitize strings worked
				configWrite(fname, data)
				return nil
			}
			log.Info("gitpb.ConfigSave() STILL FAILEd", err)
		}
		return err
	}
	err = config.Save(pb)
	return err
}

// todo: move this to Marshal() functions automatically in autogenpb?
func (repo *Repo) ValidateUTF8() error {
	if _, err := repo.Marshal(); err == nil {
		// exit if Marshal() works
		return nil
	} else {
		// log.Printf("%s repo.Marshal() failed: %v\n", repo.GetFullPath(), err)
	}
	// you only need to do this if Marshal() fails
	err := bugpb.ValidateProtoUTF8(repo)
	if err != nil {
		// log.Printf("Protobuf UTF-8 validation failed: %v\n", err)
	}
	if err := bugpb.SanitizeProtoUTF8(repo); err != nil {
		log.Warn("gitpb.ValidateUTF8()( failed:", err)
		return err
	}
	return nil
}

func (all *Repos) tryValidate() error {
	err := bugpb.ValidateProtoUTF8(all)
	if err != nil {
		log.Printf("Protobuf UTF-8 validation failed: %v\n", err)
	}
	if err := bugpb.SanitizeProtoUTF8(all); err != nil {
		log.Warn("Sanitation failed:", err)
		// log.Fatalf("Sanitization failed: %v", err)
		return err
	}
	return nil
}

// load the repos.pb file.
func (all *Repos) ConfigLoad(cfgname string) error {
	var data []byte
	var err error

	if data, err = loadFile(cfgname); err != nil {
		// something went wrong loading the file
		// all.sampleConfig() // causes nil panic
		log.Info("Repos ConfigLoad() failed", cfgname, err)
		return err
	}
	// this means the forge.pb file exists and was read
	if len(data) == 0 {
		return errors.New("gitpb.ConfigLoad() repos.pb is empty")
	}
	err = all.Unmarshal(data)
	test := NewRepos()
	if test.Uuid != all.Uuid {
		log.Log(WARN, "uuids do not match", test.Uuid, all.Uuid)
		deleteProtobufFile(cfgname)
	}
	if test.Version != all.Version {
		log.Log(WARN, "versions do not match", test.Version, all.Version)
		deleteProtobufFile(cfgname)
	}
	log.Log(INFO, cfgname, "protobuf versions and uuid match", all.Uuid, all.Version)
	return err
}

func deleteProtobufFile(filename string) {
	log.Log(WARN, "The protobuf file format has changed for", filename)
	log.Log(WARN, "Deleting old file:", filename)
	log.Log(WARN, "This file will be recreated on the next run.")
	err := os.Remove(filename)
	if err != nil {
		log.Log(WARN, "failed to remove old protobuf file", "err", err)
	}
}

func (all *Repos) sampleConfig() {
	newr := new(Repo)
	newr.FullPath = "/opt/forge/dummyentry"
	all.Append(newr)
}

func loadFile(fullname string) ([]byte, error) {
	data, err := os.ReadFile(fullname)
	if errors.Is(err, os.ErrNotExist) {
		// the file does not exist
		return nil, err
	}
	if err != nil {
		log.Info(fullname, "permission error? error =", err)
		return nil, err
	}
	return data, nil
}

func configWrite(fullname string, data []byte) error {
	log.Infof("%s your repos have changed state. cached state. (%d) bytes\n", fullname, len(data))
	cfgfile, err := os.OpenFile(fullname, os.O_RDWR|os.O_CREATE|os.O_TRUNC, 0644)
	defer cfgfile.Close()
	if err != nil {
		log.Warn("open config file :", err)
		return err
	}
	cfgfile.Write(data)
	return nil
}