package prep

// This is where the actual autocomplete happens
// lots of the fun magic is in here

import (
	"os"
	"time"

	"go.wit.com/dev/alexflint/arg"
)

func Autocomplete(dest any) *Auto {
	myAuto = new(AutoArgs)
	findAppInfo(dest) // parses back to main() for argv info

	pb := parseArgv(myAuto.appName) // parses os.Args into a protobuf
	if pb.SetupAuto {
		// --bash was passed. try to configure bash-completion
		makeAutocompleteFiles(myAuto.appName)
		os.Exit(0)
	}

	if pb.Debug {
		// dump debug info
		pb.PrintDebug()
	}

	pb.getHistoryPB() // read in the history protobuf file

	// turn on debugging if duration < 200 milliseconds
	dur := pb.Duration.AsDuration()
	if dur < time.Millisecond*200 {
		pb.Debug = true
		pb.Fast = true
	}

	arg.Register(&argBash)
	flags := []string{}
	for _, s := range pb.Argv {
		if s == "--autodebug" {
			continue
		}
		flags = append(flags, s)
	}
	// pb.Debug = true
	// pb.Debugf("DEBUG: MustParse(%v)", flags)
	var err error
	myAuto.pp, err = arg.ParseFlags(flags, dest)
	if err != nil {
		pb.Debugf("DEBUG: Parse error: %v", err)
	}

	if myAuto.pp == nil {
		pb.Debugf("DEBUG: myAuto.pp == nil after ParseFlags()")
	} else {
		// pb.Debugf("DEBUG: myAuto.pp is ok after ParseFlags()")
	}

	// not autocompleting. just return to the application
	if !pb.IsAuto {
		arg.Register(&argBash)
		myAuto.pp = arg.MustParse(dest)
		return pb
	}

	// this is a work in progress
	if pb.Last == "--gui" {
		pb.Debugf("DEBUG: last=%s found --gui", pb.Last)
		pb.Autocomplete2("andlabs gogui")
		os.Exit(0)
	} else {
		// pb.Debugf("DEBUG: NO MATCH last='%s' found key '%s' = %s", pb.Last, key, val)
	}

	if myAuto.autoFunc == nil {
		pb.SubCommand(pb.Argv...)
	} else {
		myAuto.autoFunc(pb) // run the autocomplete function the user made for their application
	}
	if pb.Debug {
		// TODO:
		// check here to see if there was any completion text sent
		// if not, send "reset bash newline\n" to cause bash to redraw PS1 for the user
	}
	os.Exit(0)
	return nil
}