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

    # Separate activeHelp from normal completions
    local completions=()
    local activeHelp=()
    __%[1]s_extract_activeHelp

    if [ $((directive & shellCompDirectiveFilterFileExt)) -ne 0 ]; then
        # File extension filtering
        local fullFilter filter filteringCmd

        # Do not use quotes around the $completions variable or else newline
        # characters will be kept.
        for filter in ${completions[*]}; do
            fullFilter+="$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=$(printf "%%s" "${completions[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_completion_types
    fi

    __%[1]s_handle_special_char "$cur" :
    __%[1]s_handle_special_char "$cur" =

    # Print the activeHelp statements before we finish
    if [ ${#activeHelp} -ne 0 ]; then
        printf "\n";
        printf "%%s\n" "${activeHelp[@]}"
        printf "\n"

        # The prompt format is only available from bash 4.4.
        # We test if it is available before using it.
        if (x=${PS1@P}) 2> /dev/null; then
            printf "%%s" "${PS1@P}${COMP_LINE[@]}"
        else
            # Can't print the prompt.  Just print the
            # text the user had typed, it is workable enough.
            printf "%%s" "${COMP_LINE[@]}"
        fi
    fi
}

# Separate activeHelp lines from real completions.
# Fills the $activeHelp and $completions arrays.
__%[1]s_extract_activeHelp() {
    local activeHelpMarker="%[8]s"
    local endIndex=${#activeHelpMarker}

    while IFS='' read -r comp; do
        if [ "${comp:0:endIndex}" = "$activeHelpMarker" ]; then
            comp=${comp:endIndex}
            __%[1]s_debug "ActiveHelp found: $comp"
            if [ -n "$comp" ]; then
                activeHelp+=("$comp")
            fi
        else
            # Not an activeHelp line but a normal completion
            completions+=("$comp")
        fi
    done < <(printf "%%s\n" "${out}")
}

__%[1]s_handle_completion_types() {
    __%[1]s_debug "__%[1]s_handle_completion_types: COMP_TYPE is $COMP_TYPE"

    case $COMP_TYPE in
    37|42)
        # Type: menu-complete/menu-complete-backward and insert-completions
        # If the user requested inserting one completion at a time, or all
        # completions at once on the command-line we must remove the descriptions.
        # https://github.com/spf13/cobra/issues/1508
        local tab=$'\t' comp
        while IFS='' read -r comp; do
            [[ -z $comp ]] && continue
            # Strip any description
            comp=${comp%%%%$tab*}
            # Only consider the completions that match
            if [[ $comp == "$cur"* ]]; then
                COMPREPLY+=("$comp")
            fi
        done < <(printf "%%s\n" "${completions[@]}")
        ;;

    *)
        # Type: complete (normal completion)
        __%[1]s_handle_standard_completion_case
        ;;
    esac
}

__%[1]s_handle_standard_completion_case() {
    local tab=$'\t' comp

    # Short circuit to optimize if we don't have descriptions
    if [[ "${completions[*]}" != *$tab* ]]; then
        IFS=$'\n' read -ra COMPREPLY -d '' < <(compgen -W "${completions[*]}" -- "$cur")
        return 0
    fi

    local longest=0
    local compline
    # Look for the longest completion so that we can format things nicely
    while IFS='' read -r compline; do
        [[ -z $compline ]] && continue
        # Strip any description before checking the length
        comp=${compline%%%%$tab*}
        # Only consider the completions that match
        [[ $comp == "$cur"* ]] || continue
        COMPREPLY+=("$compline")
        if ((${#comp}>longest)); then
            longest=${#comp}
        fi
    done < <(printf "%%s\n" "${completions[@]}")

    # 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]%%%%$tab*}"
        __%[1]s_debug "Removed description from single completion, which is now: ${comp}"
        COMPREPLY[0]=$comp
    else # Format the descriptions
        __%[1]s_format_comp_descriptions $longest
    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=$'\t'
    local comp desc maxdesclength
    local longest=$1

    local i ci
    for ci in ${!COMPREPLY[*]}; do
        comp=${COMPREPLY[ci]}
        # Properly format the description string which follows a tab character if there is one
        if [[ "$comp" == *$tab* ]]; then
            __%[1]s_debug "Original comp: $comp"
            desc=${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
            COMPREPLY[ci]=$comp
            __%[1]s_debug "Final comp: $comp"
        fi
    done
}

__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,
		activeHelpMarker))
}

// 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)
}
