package prep

// initializes logging and command line options

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

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

var argBash ArgsBash

/*
This struct can be used with the go-arg package. These
are the generic default command line arguments for the 'GUI' package
*/
type ArgsBash struct {
	Bash bool `arg:"--bash"                               help:"generate bash completion"`
}

var myBash *BashAuto

type BashAuto struct {
	id      int  // should be unique
	hidden  bool // don't update the toolkits when it's hidden
	Auto    func([]string)
	appName string // a good way to track the name of the binary ?
}

func dumpjunk() {
	fmt.Fprintln(os.Stderr, "")
	fmt.Fprintln(os.Stderr, os.Args)
	os.Exit(0)
}

// argname is the name of the executable
func Bash(argname string, autocomplete func([]string)) *BashAuto {
	if len(os.Args) > 1 && os.Args[1] == "--bash" {
		doBash(argname)
		os.Exit(0)
	}

	if len(os.Args) > 1 && os.Args[1] == "--auto-complete" {
		autocomplete(os.Args[2:])
		os.Exit(0)
	}

	arg.Register(&argBash)

	myBash = new(BashAuto)
	myBash.appName = argname

	// parse go.Arg here?
	return myBash
}

// print out auto complete debugging info
func AutoDebug(pb *Auto) {
	fmt.Fprintf(os.Stderr, "\n")
	fmt.Fprintf(os.Stderr, "AUTO DEBUG: arg0='%s' arg1='%s' partial='%s' argv=%v\n", pb.Arg0, pb.Arg1, pb.Partial, pb.Argv)
	// fmt.Println("--all --gui --verbose --force")
}

// returns the last command (is blank if the current arg is not blank)
func GetLast(cur string, argv []string) string {
	if cur != "''" {
		return ""
	}
	for _, s := range argv {
		if strings.HasPrefix(s, "-") {
			continue
		}
		return s
	}
	return ""
}

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

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

	// set debug flag
	if os.Getenv("AUTOCOMPLETE_VERBOSE") == "true" {
		newauto.Debug = true
	}
	for _, s := range os.Args {
		if s == "--debug" {
			newauto.Debug = true
		}
	}

	// should we do auto complete here?
	if len(os.Args) > 1 && os.Args[1] == "--auto-complete" {
		newauto.IsAuto = true
		newauto.Arg0 = os.Args[0]
		newauto.Arg1 = os.Args[1]
		newauto.Partial = os.Args[2]
		newauto.Argv = os.Args[3:]
		return newauto
	}
	return newauto
}

// also try to parse/send cur (?)
func Bash2(argname string, autocomplete func(*Auto)) {
	newauto := parseArgv(argname)
	if newauto.SetupAuto {
		doBash2(argname)
		os.Exit(0)
	}

	if newauto.Debug {
		// dump debug info
		AutoDebug(newauto)
	}

	if len(os.Args) > 1 && os.Args[1] == "--auto-complete" {
		autocomplete(newauto)
		os.Exit(0)
	}

	arg.Register(&argBash)
}

// returns the name of the executable registered for shell autocomplete
func AppName() string {
	return myBash.appName
}

// makes a bash autocomplete file for your command
func doBash(argname string) {
	fmt.Println(makeBashCompletionText(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(makeBashCompletionText(argname)))
		f.Close()
		log.Println("bash file created:", filename)
		log.Println("restart bash")
	} else {
		log.Info(filename, err)
	}
	os.Exit(0)
}

// 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)
}

/*
// 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 makeBashCompletionText(argname string) string {
	var out string

	out += fmt.Sprintf("# add this in your bashrc:\n")
	out += fmt.Sprintf("\n")
	out += fmt.Sprintf("# todo: add this to go-arg as a 'hidden' go-arg option --bash\n")
	out += fmt.Sprintf("#\n")
	out += fmt.Sprintf("# Put the below in the file: ~/.local/share/bash-completion/completions/%s\n", argname)
	out += fmt.Sprintf("#\n")
	out += fmt.Sprintf("# todo: make this output work/parse with:\n")
	out += fmt.Sprintf("# complete -C %s --bash go\n", argname)
	out += fmt.Sprintf("\n")
	out += fmt.Sprintf("_%s_complete()\n", argname)
	out += fmt.Sprintf("{\n")
	out += fmt.Sprintf("	# sets local to this func vars\n")
	out += fmt.Sprintf("	local cur prev all\n")
	out += fmt.Sprintf("	cur=${COMP_WORDS[COMP_CWORD]}\n")
	out += fmt.Sprintf("	prev=${COMP_WORDS[COMP_CWORD-1]}\n")
	out += fmt.Sprintf("	all=${COMP_WORDS[@]}\n")
	out += fmt.Sprintf("\n")
	out += fmt.Sprintf("	# this is where we generate the go-arg output\n")
	out += fmt.Sprintf("        GOARGS=$(%s --auto-complete $prev \\'$cur\\' $all)\n", argname)
	out += fmt.Sprintf("\n")
	out += fmt.Sprintf("	# this compares the command line input from the user\n")
	out += fmt.Sprintf("	# to whatever strings we output\n")
	out += fmt.Sprintf("        COMPREPLY=( $(compgen -W \"$GOARGS\" -- $cur) )  # THIS WORKS\n")
	out += fmt.Sprintf("	return 0\n")
	out += fmt.Sprintf("}\n")
	out += fmt.Sprintf("complete -F _%s_complete %s\n", argname, argname)
	out += fmt.Sprintf("\n")
	out += fmt.Sprintf("# copy and paste the above into your bash shell should work\n")
	return out
}

func makeBashCompletionText2(argname string) string {
	var out string

	out += fmt.Sprintf("# add this in your bashrc:\n")
	out += fmt.Sprintf("\n")
	out += fmt.Sprintf("# todo: add this to go-arg as a 'hidden' go-arg option --bash\n")
	out += fmt.Sprintf("#\n")
	out += fmt.Sprintf("# Put the below in the file: ~/.local/share/bash-completion/completions/%s\n", argname)
	out += fmt.Sprintf("#\n")
	out += fmt.Sprintf("# todo: make this output work/parse with:\n")
	out += fmt.Sprintf("# complete -C %s --bash go\n", argname)
	out += fmt.Sprintf("\n")
	out += fmt.Sprintf("_%s_complete()\n", argname)
	out += fmt.Sprintf("{\n")
	out += fmt.Sprintf("	# sets local to this func vars\n")
	out += fmt.Sprintf("	local cur prev all\n")
	out += fmt.Sprintf("	cur=${COMP_WORDS[COMP_CWORD]}\n")
	out += fmt.Sprintf("	# prev=${COMP_WORDS[COMP_CWORD-1]}\n")
	out += fmt.Sprintf("	all=${COMP_WORDS[@]}\n")
	out += fmt.Sprintf("\n")
	out += fmt.Sprintf("	# this is where we generate the go-arg output\n")
	out += fmt.Sprintf("        GOARGS=$(%s --auto-complete \\'$cur\\' $all)\n", argname)
	out += fmt.Sprintf("\n")
	out += fmt.Sprintf("	# this compares the command line input from the user\n")
	out += fmt.Sprintf("	# to whatever strings we output\n")
	out += fmt.Sprintf("        COMPREPLY=( $(compgen -W \"$GOARGS\" -- $cur) )  # THIS WORKS\n")
	out += fmt.Sprintf("	return 0\n")
	out += fmt.Sprintf("}\n")
	out += fmt.Sprintf("complete -F _%s_complete %s\n", argname, argname)
	out += fmt.Sprintf("\n")
	out += fmt.Sprintf("# copy and paste the above into your bash shell should work\n")
	return out
}