package prep

// essentially .bash_history, but in a protobuf and for any shell
// An elegant weapon... for a more civilized age.
// stores files ./cache/argv/<appname>.pb

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

	"go.wit.com/lib/config"
	durationpb "google.golang.org/protobuf/types/known/durationpb"
	timestamppb "google.golang.org/protobuf/types/known/timestamppb"
)

// makes a bash autocomplete file for your command
func (pb *Auto) getHistoryPB() error {
	cacheDir, err := os.UserCacheDir()
	if err != nil {
		return err
	}
	basedir := filepath.Join(cacheDir, "argv")
	os.MkdirAll(basedir, os.ModePerm)
	fullname := filepath.Join(basedir, pb.Argname+".pb")

	all := NewAutos()
	var last *Auto
	data, err := os.ReadFile(fullname)
	if err == nil {
		err = all.Unmarshal(data)
		if err == nil {
			for found := range all.IterAll() {
				dur := time.Since(found.Ctime.AsTime())
				pb.Duration = durationpb.New(dur)
				// found.PrintDebug()
				cmd := fmt.Sprintf("cmd='%s'", found.Cmd)
				arglast := fmt.Sprintf("last='%s'", found.Last)
				partial := fmt.Sprintf("p='%s'", found.Partial)
				age := fmt.Sprintf("age='%-6.6s'", config.FormatDuration(dur))
				pb.Debugf("AUTO HISTORY: %s %-18.18s %-18.18s %-12.12s argv='%v' goargs='%v'", age, cmd, arglast, partial, found.Argv, found.Goargs)
				last = found
			}
		}
	}

	if all.Len() > 15 {
		pb.Debugf("DEBUG: trim() history is over 100 len=%d vs new=%d", all.Len(), all.Len()-90)
		all.Autos = all.Autos[all.Len()-10:]
		// newall.Autos = all.Autos[0:10]
		// for _, found := range all.Autos[0:10] {
		// 	newall.Append(found)
		// }
	}

	// need this for the first time the user runs autocomplete
	if last == nil {
		last = new(Auto)
	}

	now := time.Now()
	pb.Ctime = timestamppb.New(now)
	duration := time.Since(last.Ctime.AsTime())
	all.Append(pb)

	data, err = all.Marshal()
	if err != nil {
		return err
	}

	f, err := os.OpenFile(fullname, os.O_RDWR|os.O_CREATE|os.O_TRUNC, 0644)
	defer f.Close()
	if err != nil {
		return err
	}
	_, err = f.Write(data)
	pb.Debugf("WRITE DEBUG: write PB='%s' len(pb)=%d len(data)=%d dur=%v err=%v", fullname, all.Len(), len(data), duration, err)
	return err
}