package prep

// initializes logging and command line options

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

	"go.wit.com/dev/alexflint/arg"
	"go.wit.com/lib/gui/shell"
	"go.wit.com/log"
	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 doBash2(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 shell.Exists(filename) {
		log.Println(filename, "file already exists")
		// os.Exit(0)
	}
	basedir, _ := filepath.Split(filename)
	if !shell.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()
		log.Println("bash file created:", filename)
		log.Println("restart bash")
	} else {
		log.Info(filename, err)
	}
	os.Exit(0)
}

func (pb *Auto) Debugf(fmts string, parts ...any) {
	fmts = strings.TrimSpace(fmts)
	fmts += "\n"
	// NOTE: env doesn't work probably most (all?) the time because bash
	// doesn't send all the ENV to autocomplete. so, trap on a "--autodebug" command line arg
	if os.Getenv("AUTOCOMPLETE_VERBOSE") == "true" || pb.Debug {
		if !pb.Newline {
			fmt.Fprintf(os.Stderr, "\n")
			pb.Newline = true
		}
		fmt.Fprintf(os.Stderr, fmts, parts...)
	} else {
		// fmt.Fprintf(os.Stderr, "NOT DOING ANYTHING\n")
	}
}

// makes a bash autocomplete file for your command
func (pb *Auto) doHandlePB() error {
	homeDir, err := os.UserHomeDir()
	if err != nil {
		return err
	}
	basedir := filepath.Join(homeDir, ".cache/autocomplete")
	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)
				pb.Debugf("AUTO HISTORY: age=%-6.6s %-18.18s %-18.18s partial='%s' argv='%v'", shell.FormatDuration(dur), cmd, arglast, found.Partial, found.Argv)
				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
}

/*
// prints help to STDERR // TODO: move everything below this to go-args
func (args) doBashHelp() {
	if argv.BashAuto[1] != "''" {
		// if this is not blank, then the user has typed something
		return
	}
	if argv.BashAuto[0] != ARGNAME {
		// if this is not the name of the command, the user already started doing something
		return
	}
	if argv.BashAuto[0] == ARGNAME {
		me.pp.WriteHelp(os.Stderr)
		return
	}
	fmt.Fprintln(os.Stderr, "")
	fmt.Fprintln(os.Stderr, "hello world")
	fmt.Fprintln(os.Stderr, "")
}
*/

func (pb *Auto) Autocomplete(notsure any, sendthis string) {
	parts := strings.Split(sendthis, " ")
	var all []string
	for _, part := range parts {
		var found bool
		for _, s := range os.Args {
			if s == part {
				found = true
			}
		}
		if found {
			continue
		}
		all = append(all, part)
	}
	fmt.Printf("%s", strings.Join(all, " "))
}

func (pb *Auto) Autocomplete2(sendthis string) {
	dur := pb.Duration.AsDuration()
	if dur < time.Millisecond*200 {
		pb.Debug = true
		/*
			pb.Debugf("TODO: show extended help here '%s' '%s' %v dur=%v\n", pb.Arg0, pb.Arg1, pb.Argv, shell.FormatDuration(dur))
			pb.PrintDebug()
			fmt.Println(" ")
		*/
		if myAuto.pp == nil {
			pb.Debugf("myAuto.pp == nil")
		} else {
			pb.Debugf("myAuto.pp != nil")
			if pb.Cmd == "" {
				myAuto.pp.WriteHelp(os.Stderr)
			} else {
				myAuto.pp.WriteHelpForSubcommand(os.Stderr, pb.Cmd)
			}
		}
	}

	parts := strings.Split(sendthis, " ")
	var all []string
	for _, part := range parts {
		var found bool
		for _, s := range os.Args {
			if s == part {
				found = true
			}
		}
		if found {
			continue
		}
		all = append(all, part)
	}
	fmt.Printf("%s", strings.Join(all, " "))
	/*
		if dur > time.Millisecond*200 {
			if dur < time.Millisecond*800 {
				// fmt.Println("a b")
				fmt.Println(pb.Partial + " hello world")
			}
		}
	*/
}

func parseArgv(argname string) *Auto {
	pb := new(Auto)
	pb.Argname = argname
	if len(os.Args) == 0 {
		return pb
	}

	if len(os.Args) > 1 && os.Args[1] == "--bash" {
		pb.SetupAuto = true
		return pb
	}

	// HACK: set debug flag if --autodebug is passed
	for _, s := range os.Args {
		if s == "--autodebug" {
			pb.Debug = true
		}
	}

	// should we do auto complete here?
	if len(os.Args) > 1 && os.Args[1] == "--auto-complete" {
		pb.IsAuto = true
		pb.Arg0 = os.Args[0]
		pb.Arg1 = os.Args[1]
		pb.Partial = os.Args[2]
		pb.Arg3 = os.Args[3]
		if len(os.Args) < 5 {
			// the user is doing autocomplete on the command itself
			pb.Partial = ""
			pb.Cmd = ""
			pb.Argv = []string{""}
			return pb
		}
		pb.Argv = os.Args[4:]
		if pb.Partial == "''" {
			pb.Partial = ""
			pb.Cmd = "todo:findme"
		}
		// set pb.Cmd to the first thing that doesn't have a '-' arg
		for _, s := range pb.Argv {
			if strings.HasPrefix(s, "-") {
				continue
			}
			pb.Cmd = s
			break
		}
		if pb.Partial == "'"+pb.Cmd+"'" {
			// not really a command, it's just a partially inputed string from the user
			pb.Cmd = ""
		}
		// try to figure out what the last argv is
		for _, s := range pb.Argv {
			p := fmt.Sprintf("'%s'", s)
			if pb.Partial == p {
				pb.Debugf("DEBUG: MATCH Partial %s %s", s, p)
				continue
			} else {
				pb.Debugf("DEBUG: NO MATCH Partial %s %s", s, p)
			}
			pb.Last = s
		}
		// if pb.Cmd == "" {
		// 	pb.Cmd = strings.Join(pb.Argv, "BLAH")
		// }
	}
	return pb
}

// also try to parse/send cur (?)
func Bash2(argname string, appAutoFunc func(*Auto)) *Auto {
	pb := parseArgv(argname)
	if pb.SetupAuto {
		// --bash was passed. try to configure bash-completion
		doBash2(argname)
		os.Exit(0)
	}

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

	if pb.IsAuto {
		pb.doHandlePB()
		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
		}
		arg.Register(&argBash)
		// flags := []string{pb.Arg3, pb.Arg0}
		// arg.InitFlags(flags)

		appAutoFunc(pb) // run the autocomplete function the user made for their application
		os.Exit(0)
	}

	arg.Register(&argBash)
	return pb
}

// also try to parse/send cur (?)
// func Bash3(appAutoFunc func(*Auto), dest any) *Auto {
func Bash3(dest any) *Auto {
	myAuto = new(AutoArgs)
	findAppInfo(dest) // parses back to main() for argv info

	pb := parseArgv(myAuto.appName)
	if pb.SetupAuto {
		// --bash was passed. try to configure bash-completion
		doBash2(myAuto.appName)
		os.Exit(0)
	}

	myAuto.match = make(map[string]string)
	myAuto.match["--gui"] = "andlabs gocui"

	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 {
		for key, val := range myAuto.match {
			if pb.Last == key {
				pb.Debugf("DEBUG: last=%s found key %s = %s", pb.Last, key, val)
				pb.Autocomplete2(val)
				os.Exit(0)
			} else {
				pb.Debugf("DEBUG: NO MATCH last='%s' found key '%s' = %s", pb.Last, key, val)
			}
		}
		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
}