package prep

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

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

	"go.wit.com/dev/alexflint/arg"
	"go.wit.com/lib/config"
	"go.wit.com/log"
)

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.doHandlePB() // 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
	}

	// prepart["--gui"] = "andlabs gocui"

	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()")
	}

	if pb.IsAuto {
		// myAuto.match = make(map[string]string)
		// myAuto.match["--gui"] = "andlabs gocui"
		// for key, val := range myAuto.match {
		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)
	}

	arg.Register(&argBash)
	myAuto.pp = arg.MustParse(dest)
	return pb
}

// makes a autocomplete file for your command
func makeAutocompleteFiles(argname string) {
	fmt.Println(makeBashCompletionText2(argname))

	homeDir, err := os.UserHomeDir()
	if err != nil {
		log.Printf("# %v\n", err)
		os.Exit(0)
	}
	filename := filepath.Join(homeDir, ".local/share/bash-completion/completions", argname)
	if config.Exists(filename) {
		log.Fprintln(os.Stderr, "# file already exists", filename)
		// os.Exit(0)
	}
	basedir, _ := filepath.Split(filename)
	if !config.IsDir(basedir) {
		os.MkdirAll(basedir, os.ModePerm)
	}

	if f, err := os.OpenFile(filename, os.O_APPEND|os.O_CREATE|os.O_WRONLY, 0644); err == nil {
		f.Write([]byte(makeBashCompletionText2(argname)))
		f.Close()
	} else {
		log.Fprintln(os.Stderr, "# open file error", filename, err)
	}
	os.Exit(0)
}