#!/usr/bin/env bash
#
# pash - simple password manager.

pw_add() {
    yn "Generate a password?"

    case $REPLY in
        [yY])
            password=$("${gpg[0]}" --armor --gen-random 0 50)
            password=${password:0:50}
        ;;

        *)  read -rsp "Enter password: " password ;;
    esac

    [[ $password ]] ||
        die "Failed to generate a password."

    "${gpg[0]}" -co "$1.gpg" <<< "$password"
}

pw_del() {
    yn "Delete pass file '$1'?"

    [[ $REPLY == [yY] ]] &&
        rm "$1.gpg"
}

pw_show() {
    read -r password < <("${gpg[0]}" -dq "$1.gpg")

    [[ ${FUNCNAME[1]} != pw_copy ]] &&
        printf '%s\n' "$password"
}

pw_copy() {
    pw_show "$1"

    if [[ $TMUX ]]; then
        tmux load-buffer "$password"
    else
        hash xclip && xclip -selection clipboard <<< "$password"
    fi
}

pw_list() {
    shopt -s globstar nullglob

    printf '%s\n' "pash"

    for pwrd in **; do
        [[ -d $pwrd ]] && dir=/ || dir=

        nest=${pwrd//[^\/]}
        pwrd=${pwrd//[^[:print:]]/^[}
        pwrd=${pwrd//.gpg}

        printf '%s\n' "${nest//\//│  }├─ ${pwrd##*/}${dir}"
    done

    printf '└%s\b┘\n' "${nest//\//──┴}"
}

yn() {
    read -rn 1 -p "$1 [y/n]: "
    printf '\n'
}

die() {
    printf 'error: %s\n' "$1" >&2
    exit 1
}

usage() { printf '%s' "\
pash 0.1.0 - simple password manager.
=> [a]dd  [name] - Create a new password entry.
=> [c]opy [name] - Copy entry to the clipboard.
=> [d]el  [name] - Delete a password entry.
=> [l]ist        - List all entries.
=> [s]how [name] - Show password for an entry.
"
exit 1
}

main() {
    [[ $1 == -? || -z $1 ]] &&
        usage

    mapfile -t gpg < <(type -p gpg gpg2) && [[ ! -x ${gpg[0]} ]] &&
        die "GPG not found."

    mkdir -p "${pass_dir:=${XDG_DATA_HOME:=$HOME/.local/share}/pash}" ||
        die "Couldn't create password directory."

    cd "$pass_dir" ||
        die "Can't access password directory."

    [[ $1 == [ads]* && -z $2 ]] &&
        die "Missing [name] argument."

    [[ $1 == [ds]* && ! -f $2.gpg ]] &&
        die "Pass file '$2' doesn't exist."

    [[ $1 == [a]* && -f $2.gpg ]] &&
        die "Pass file '$2' already exists."

    [[ $2 == */* && $2 == *../* ]] &&
        die "Category went out of bounds."

    [[ $2 == /* ]] &&
        die "Category can't start with '/'."

    [[ $2 == */* ]] &&
        { mkdir -p "${2%/*}" || die "Couldn't create category '${2%/*}'.";}

    umask 077

    case $1 in
        a*) pw_add  "$2" ;;
        c*) pw_copy "$2" ;;
        d*) pw_del  "$2" ;;
        s*) pw_show "$2" ;;
        l*) pw_list ;;
        *)  usage
    esac
}

main "$@"