package cobra

import (

	"bytes"

	"fmt"

	"io"

	"os"

)

func (c *Command) genBashCompletion(w io.Writer, includeDesc bool) error {

	buf := new(bytes.Buffer)

	genBashComp(buf, c.Name(), includeDesc)

	_, err := buf.WriteTo(w)

	return err

}

func genBashComp(buf io.StringWriter, name string, includeDesc bool) {

	compCmd := ShellCompRequestCmd

	if !includeDesc {

		compCmd = ShellCompNoDescRequestCmd

	}

	WriteStringAndCheck(buf, fmt.Sprintf(`# bash completion V2 for %-36[1]s -*- shell-script -*-

__%[1]s_debug()

{

    if [[ -n ${BASH_COMP_DEBUG_FILE:-} ]]; then

        echo "$*" >> "${BASH_COMP_DEBUG_FILE}"

    fi

}

# Macs have bash3 for which the bash-completion package doesn't include

# _init_completion. This is a minimal version of that function.

__%[1]s_init_completion()

{

    COMPREPLY=()

    _get_comp_words_by_ref "$@" cur prev words cword

}

# This function calls the %[1]s program to obtain the completion

# results and the directive.  It fills the 'out' and 'directive' vars.

__%[1]s_get_completion_results() {

    local requestComp lastParam lastChar args

    # Prepare the command to request completions for the program.

    # Calling ${words[0]} instead of directly %[1]s allows to handle aliases

    args=("${words[@]:1}")

    requestComp="${words[0]} %[2]s ${args[*]}"

    lastParam=${words[$((${#words[@]}-1))]}

    lastChar=${lastParam:$((${#lastParam}-1)):1}

    __%[1]s_debug "lastParam ${lastParam}, lastChar ${lastChar}"

    if [ -z "${cur}" ] && [ "${lastChar}" != "=" ]; then

        # If the last parameter is complete (there is a space following it)

        # We add an extra empty parameter so we can indicate this to the go method.

        __%[1]s_debug "Adding extra empty parameter"

        requestComp="${requestComp} ''"

    fi

    # When completing a flag with an = (e.g., %[1]s -n=<TAB>)

    # bash focuses on the part after the =, so we need to remove

    # the flag part from $cur

    if [[ "${cur}" == -*=* ]]; then

        cur="${cur#*=}"

    fi

    __%[1]s_debug "Calling ${requestComp}"

    # Use eval to handle any environment variables and such

    out=$(eval "${requestComp}" 2>/dev/null)

    # Extract the directive integer at the very end of the output following a colon (:)

    directive=${out##*:}

    # Remove the directive

    out=${out%%:*}

    if [ "${directive}" = "${out}" ]; then

        # There is not directive specified

        directive=0

    fi

    __%[1]s_debug "The completion directive is: ${directive}"

    __%[1]s_debug "The completions are: ${out[*]}"

}

__%[1]s_process_completion_results() {

    local shellCompDirectiveError=%[3]d

    local shellCompDirectiveNoSpace=%[4]d

    local shellCompDirectiveNoFileComp=%[5]d

    local shellCompDirectiveFilterFileExt=%[6]d

    local shellCompDirectiveFilterDirs=%[7]d

    if [ $((directive & shellCompDirectiveError)) -ne 0 ]; then

        # Error code.  No completion.

        __%[1]s_debug "Received error from custom completion go code"

        return

    else

        if [ $((directive & shellCompDirectiveNoSpace)) -ne 0 ]; then

            if [[ $(type -t compopt) = "builtin" ]]; then

                __%[1]s_debug "Activating no space"

                compopt -o nospace

            else

                __%[1]s_debug "No space directive not supported in this version of bash"

            fi

        fi

        if [ $((directive & shellCompDirectiveNoFileComp)) -ne 0 ]; then

            if [[ $(type -t compopt) = "builtin" ]]; then

                __%[1]s_debug "Activating no file completion"

                compopt +o default

            else

                __%[1]s_debug "No file completion directive not supported in this version of bash"

            fi

        fi

    fi

    if [ $((directive & shellCompDirectiveFilterFileExt)) -ne 0 ]; then

        # File extension filtering

        local fullFilter filter filteringCmd

        # Do not use quotes around the $out variable or else newline

        # characters will be kept.

        for filter in ${out[*]}; do

            fullFilter+="$filter|"

        done

        filteringCmd="_filedir $fullFilter"

        __%[1]s_debug "File filtering command: $filteringCmd"

        $filteringCmd

    elif [ $((directive & shellCompDirectiveFilterDirs)) -ne 0 ]; then

        # File completion for directories only

        # Use printf to strip any trailing newline

        local subdir

        subdir=$(printf "%%s" "${out[0]}")

        if [ -n "$subdir" ]; then

            __%[1]s_debug "Listing directories in $subdir"

            pushd "$subdir" >/dev/null 2>&1 && _filedir -d && popd >/dev/null 2>&1 || return

        else

            __%[1]s_debug "Listing directories in ."

            _filedir -d

        fi

    else

        __%[1]s_handle_standard_completion_case

    fi

    __%[1]s_handle_special_char "$cur" :

    __%[1]s_handle_special_char "$cur" =

}

__%[1]s_handle_standard_completion_case() {

    local tab comp

    tab=$(printf '\t')

    local longest=0

    # Look for the longest completion so that we can format things nicely

    while IFS='' read -r comp; do

        # Strip any description before checking the length

        comp=${comp%%%%$tab*}

        # Only consider the completions that match

        comp=$(compgen -W "$comp" -- "$cur")

        if ((${#comp}>longest)); then

            longest=${#comp}

        fi

    done < <(printf "%%s\n" "${out[@]}")

    local completions=()

    while IFS='' read -r comp; do

        if [ -z "$comp" ]; then

            continue

        fi

        __%[1]s_debug "Original comp: $comp"

        comp="$(__%[1]s_format_comp_descriptions "$comp" "$longest")"

        __%[1]s_debug "Final comp: $comp"

        completions+=("$comp")

    done < <(printf "%%s\n" "${out[@]}")

    while IFS='' read -r comp; do

        COMPREPLY+=("$comp")

    done < <(compgen -W "${completions[*]}" -- "$cur")

    # If there is a single completion left, remove the description text

    if [ ${#COMPREPLY[*]} -eq 1 ]; then

        __%[1]s_debug "COMPREPLY[0]: ${COMPREPLY[0]}"

        comp="${COMPREPLY[0]%%%% *}"

        __%[1]s_debug "Removed description from single completion, which is now: ${comp}"

        COMPREPLY=()

        COMPREPLY+=("$comp")

    fi

}

__%[1]s_handle_special_char()

{

    local comp="$1"

    local char=$2

    if [[ "$comp" == *${char}* && "$COMP_WORDBREAKS" == *${char}* ]]; then

        local word=${comp%%"${comp##*${char}}"}

        local idx=${#COMPREPLY[*]}

        while [[ $((--idx)) -ge 0 ]]; do

            COMPREPLY[$idx]=${COMPREPLY[$idx]#"$word"}

        done

    fi

}

__%[1]s_format_comp_descriptions()

{

    local tab

    tab=$(printf '\t')

    local comp="$1"

    local longest=$2

    # Properly format the description string which follows a tab character if there is one

    if [[ "$comp" == *$tab* ]]; then

        desc=${comp#*$tab}

        comp=${comp%%%%$tab*}

        # $COLUMNS stores the current shell width.

        # Remove an extra 4 because we add 2 spaces and 2 parentheses.

        maxdesclength=$(( COLUMNS - longest - 4 ))

        # Make sure we can fit a description of at least 8 characters

        # if we are to align the descriptions.

        if [[ $maxdesclength -gt 8 ]]; then

            # Add the proper number of spaces to align the descriptions

            for ((i = ${#comp} ; i < longest ; i++)); do

                comp+=" "

            done

        else

            # Don't pad the descriptions so we can fit more text after the completion

            maxdesclength=$(( COLUMNS - ${#comp} - 4 ))

        fi

        # If there is enough space for any description text,

        # truncate the descriptions that are too long for the shell width

        if [ $maxdesclength -gt 0 ]; then

            if [ ${#desc} -gt $maxdesclength ]; then

                desc=${desc:0:$(( maxdesclength - 1 ))}

                desc+="…"

            fi

            comp+="  ($desc)"

        fi

    fi

    # Must use printf to escape all special characters

    printf "%%q" "${comp}"

}

__start_%[1]s()

{

    local cur prev words cword split

    COMPREPLY=()

    # Call _init_completion from the bash-completion package

    # to prepare the arguments properly

    if declare -F _init_completion >/dev/null 2>&1; then

        _init_completion -n "=:" || return

    else

        __%[1]s_init_completion -n "=:" || return

    fi

    __%[1]s_debug

    __%[1]s_debug "========= starting completion logic =========="

    __%[1]s_debug "cur is ${cur}, words[*] is ${words[*]}, #words[@] is ${#words[@]}, cword is $cword"

    # The user could have moved the cursor backwards on the command-line.

    # We need to trigger completion from the $cword location, so we need

    # to truncate the command-line ($words) up to the $cword location.

    words=("${words[@]:0:$cword+1}")

    __%[1]s_debug "Truncated words[*]: ${words[*]},"

    local out directive

    __%[1]s_get_completion_results

    __%[1]s_process_completion_results

}

if [[ $(type -t compopt) = "builtin" ]]; then

    complete -o default -F __start_%[1]s %[1]s

else

    complete -o default -o nospace -F __start_%[1]s %[1]s

fi

# ex: ts=4 sw=4 et filetype=sh

`, name, compCmd,

		ShellCompDirectiveError, ShellCompDirectiveNoSpace, ShellCompDirectiveNoFileComp,

		ShellCompDirectiveFilterFileExt, ShellCompDirectiveFilterDirs))

}

// GenBashCompletionFileV2 generates Bash completion version 2.

func (c *Command) GenBashCompletionFileV2(filename string, includeDesc bool) error {

	outFile, err := os.Create(filename)

	if err != nil {

		return err

	}

	defer outFile.Close()

	return c.GenBashCompletionV2(outFile, includeDesc)

}

// GenBashCompletionV2 generates Bash completion file version 2

// and writes it to the passed writer.

func (c *Command) GenBashCompletionV2(w io.Writer, includeDesc bool) error {

	return c.genBashCompletion(w, includeDesc)

}