package prep

// initializes logging and command line options

import (
	"fmt"
	"os"
	"path/filepath"
	"strconv"
	"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 (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)
				partial := fmt.Sprintf("p='%s'", found.Partial)
				age := fmt.Sprintf("age='%-6.6s'", shell.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
}

func (pb *Auto) SubCommand(cmd ...string) {
	partial := strings.Trim(pb.Partial, "'")
	if pb.Debug {
		if myAuto.examples == nil {
			pb.Debugf("WRITE DEBUG: argv.Examples() not defined")
			// log.Fprintf(os.Stderr, "\n")
			// log.Fprintf(os.Stderr, "examples was nil\n")
			// log.Fprintf(os.Stderr, "\n")
		} else {
			log.Fprintf(os.Stderr, "\n")
			log.Fprintf(os.Stderr, "\n")
			log.Fprintf(os.Stderr, "Examples:\n")
			for _, line := range strings.Split(myAuto.examples(), "\n") {
				log.Fprintf(os.Stderr, "  %s\n", line)
			}
			// log.Fprintf(os.Stderr, "\n")
		}
		myAuto.pp.WriteHelpForAutocomplete(os.Stderr, os.Stdout, partial, cmd...)
		// myAuto.pp.GetUsageForSubcommand(os.Stdout, os.Stderr, partial, cmd)
		// myAuto.pp.GetUsageForSubcommand(os.Stdout, nil, partial, cmd)
	} else {
		f, _ := os.OpenFile("/tmp/outlook", os.O_APPEND|os.O_CREATE|os.O_WRONLY, 0644)
		myAuto.pp.WriteHelpForAutocomplete(f, os.Stdout, partial, cmd...)
		// myAuto.pp.GetUsageForSubcommand(os.Stdout, nil, partial, cmd)
	}
	os.Exit(0)
	// SubCommand(cmd)
}

/*
func (pb *Auto) SubCommandShow() {
	partial := strings.Trim(pb.Partial, "'")
	if pb.Debug {
		myAuto.pp.WriteHelpForAutocomplete(os.Stderr, os.Stdout, partial, "show", "repo")
	} else {
		f, _ := os.OpenFile("/tmp/outlook", os.O_APPEND|os.O_CREATE|os.O_WRONLY, 0644)
		myAuto.pp.WriteHelpForAutocomplete(f, os.Stdout, partial, "show", "repo")
	}
	os.Exit(0)
}

func (pb *Auto) SubCommand2(cmd string, addmatch []string) {
	partial := strings.Trim(pb.Partial, "'")
	if pb.Debug {
		// myAuto.pp.WriteHelpForAutocomplete(os.Stderr, os.Stdout, partial, pb.Cmd)
		myAuto.pp.WriteHelpForAutocomplete(os.Stderr, os.Stdout, "", "")
		// myAuto.pp.GetUsageForSubcommand(os.Stdout, os.Stderr, partial, cmd)
		// myAuto.pp.GetUsageForSubcommand(os.Stdout, nil, partial, cmd)
	} else {
		f, _ := os.OpenFile("/tmp/outlook", os.O_APPEND|os.O_CREATE|os.O_WRONLY, 0644)
		myAuto.pp.WriteHelpForAutocomplete(f, os.Stdout, partial, pb.Cmd)
		// myAuto.pp.GetUsageForSubcommand(os.Stdout, nil, partial, cmd)
	}
	os.Exit(0)
	// SubCommand(cmd)
}
*/

// todo: move everything to this?
func (pb *Auto) Autocomplete3(sendthis []string) {
	pb.Autocomplete2(strings.Join(sendthis, " "))
}

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
		}
	}

	// complete -C /usr/bin/argv forge sets:
	//    * `COMP_LINE`: A string containing the entire current command line (forge first second third forth ). This is what you are looking for.
	//    * `COMP_POINT`: A number indicating the cursor's position (index) within the COMP_LINE.
	//    * `COMP_WORDS`: An array in Bash (seen differently by Go) containing each individual word on the command line.
	//    * `COMP_CWORD`: A number indicating the index of the word the cursor is currently on within the COMP_WORDS array.
	if len(os.Args) > 1 && os.Args[1] == pb.Argname {
		pb.IsAuto = true
		parts := strings.Split(os.Getenv("COMP_LINE"), " ")
		pb.Debug = true
		log.Fprintf(os.Stderr, "\n")
		pb.Debugf("MATCH Partial os.Args=%v COMP_LINE=%v", os.Args, os.Getenv("COMP_LINE"))
		// log.Fprintf(os.Stdout, "jcarr")
		if len(parts) > 0 {
			pb.Arg0 = parts[0]
		}
		pb.Arg1 = os.Args[1]
		os.Exit(0)
	}

	if len(os.Args) > 1 && os.Args[1] == "--version" {
		if myAuto.buildtime != nil {
			// if binary defined buildtime() then process standard version output here
			doVersion(pb)
			os.Exit(0)
		}
	}

	// 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
		}
		if pb.Partial == "''" {
			pb.Partial = ""
		}
		// pb.Argv = os.Args[4:]
		for _, s := range os.Args[4:] {
			if s == "--autodebug" {
				continue
			}
			tmp := strings.Trim(pb.Partial, "'")
			if tmp == s {
				// don't put pb.Partial into Argv
				continue
			}
			pb.Argv = append(pb.Argv, s)
		}
		// 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: Last argv MATCHES Partial %s %s", s, p)
				continue
			} else {
				pb.Debugf("DEBUG: Last argv DOES NOT MATCH Partial %s %s", s, p)
			}
			pb.Last = s
			if strings.HasPrefix(s, "-") {
				// skip args like -test --verbose when sending subcommands to go-args for help text
				continue
			}
			pb.Goargs = append(pb.Goargs, s)
		}
		// if pb.Cmd == "" {
		// 	pb.Cmd = strings.Join(pb.Argv, "BLAH")
		// }
	}
	return pb
}

func Bash3(dest any) *Auto {
	return Bash(dest)
}

func Bash(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
		doBash(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)
			}
		}
		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 bash autocomplete file for your command
func doBash(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.Fprintln(os.Stderr, "# file already exists", filename)
		// 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()
	} else {
		log.Fprintln(os.Stderr, "# open file error", filename, err)
	}
	os.Exit(0)
}

func doVersion(pb *Auto) {
	if myAuto.buildtime == nil {
		return
	}
	BUILDTIME, VERSION := myAuto.buildtime()

	parts := strings.Split(BUILDTIME, ".")
	if len(parts) == 1 {
		// The input epoch seconds
		// epochSeconds := int64(1758646486)
		num, err := strconv.Atoi(BUILDTIME)
		epochSeconds := int64(num)
		if err == nil {

			// 1. Convert the epoch seconds to a time.Time object.
			//    time.Unix() creates the time in the UTC timezone by default.
			t := time.Unix(epochSeconds, 0)

			// 2. Convert the UTC time to the computer's local timezone.
			localTime := t.Local()

			// 3. Print the result. The default format is clear and includes the timezone.
			// fmt.Println("Default format:", localTime)
			// For a more human-friendly format, use the Format() method.
			// Go uses a special reference time for formatting: Mon Jan 2 15:04:05 2006 MST
			// You lay out your desired format using these specific numbers.
			// formattedString := localTime.Format("Monday, January 2, 2006 at 3:04:05 PM (MST)")
			// fmt.Println(" Custom format:", formattedString)

			// now := time.Now()
			// dur := time.Since(localTime)
			// BUILDTIME = fmt.Sprintf("%s age(%v)", localTime.String(), , shell.FormatDuration(time.Since(localTime)))
			stamp := log.Sprintf("Built %s   Age(%s)\n", localTime.Format("2006-01-02 15:04"), shell.FormatDuration(time.Since(localTime)))
			log.Infof("%s %s      %s\n", pb.Argname, VERSION, stamp)
			os.Exit(0)
		}
	}

	log.Infof("%s %s    Built on  %s\n", pb.Argname, VERSION, BUILDTIME)
	os.Exit(0)
}