package argvpb

// makes the needed bash completion in the bash standard paths

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

	"go.wit.com/lib/config"
	"go.wit.com/log"
)

func MakeBashCompleteFiles(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)
	}
}

// deprecate this
func Bash3(dest any) *Argv {
	return Autocomplete(dest)
}

// deprecate this
func Bash(dest any) *Argv {
	return Autocomplete(dest)
}

func makeCompletionText(argname string) string {
	sh := getParentProcessName()
	return fmt.Sprintf("# shell might be %s", sh)
}

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
}

func getParentProcessName() string {
	ppid := os.Getppid()
	// On Linux, the command name is in /proc/<pid>/comm
	commPath := fmt.Sprintf("/proc/%d/comm", ppid)
	content, err := ioutil.ReadFile(commPath)
	if err != nil {
		return "unknown"
	}
	// The file content has a trailing newline, so trim it.
	return strings.TrimSpace(string(content))
}