#!/bin/bash

set -e
_help() {
  SELF=$( basename "$0" )
  echo "Console Clipboard manager

  Usage: $SELF [command] [name] [filename]

  Commands:
    (r)ead
    (w)rite
    (d)elete
    (l)ist [default]

  Name: Any string for the clipboard name. default: 0
  Filename:
    When reading from clipboard:
      File or folder to write the clipboard contents. If omitted: stdout
    When writing to clipboard:g/
      File or folder to read from. If omitted: stdin

  Shorthand:
    echo my data | $SELF 1  # writes data with name: 1
    $SELF 1 | cat - # prints the contents of file: 1
"
  exit
}


_load_config(){
  STORAGE=~/.cache/cclip
  CONFIG=~/.config/cclip/config

  [[ -f "$CONFIG" ]] || {
    mkdir -p $( dirname "$CONFIG" )
    echo STORAGE=$STORAGE > "$CONFIG"
    _msg "created config in "$CONFIG""
  }
  [[ -f "$CONFIG" ]] && . "$CONFIG"
  # TODO, run line by line for security, get only lines with matching config item
  mkdir -p "$STORAGE"
  [[ -e "$STORAGE"/0 ]] || {
    echo Sample data | _write_stdin 0
  }
}

_list() {
  cd "$STORAGE"
  [[ $(ls -A) ]] || {
    _msg "No clipboard entries"
    return
  }
  printf " %30s %8s  %-19s  %s\n" Type Size Date Name
  for n in *; do
    size=$( du -k -h -s --apparent-size "$n" | awk '{ print $1 }' )
    type=$( file -b "$n" )
    date=$( date -r "$n" -Iseconds )
    printf " %30s %8s  %-19s  %s\n" \
        "${type:0:30}" \
        "$size" \
        "${date::-6}" \
        "$n"
  done
}

_write() {
  # no file mentioned, use stdin
  [[ -z "$FILE" ]] && stream_in=1
  # stdin is open, use stdin
  [ -t 0 ] || stream_in=1

  [ -t 0 ] && [[ -z "$FILE" ]] && {
    _msg File to read needed, or use stdin
    exit 1
  }

  # sure to write something,  delete target first
  rm -rf "$STORAGE/$NAME"

  [[ "$stream_in" -eq 1 ]] && {
    _write_stdin "$NAME"
  } || {
    _write_files "$NAME" "$FILE"
  }
}

_write_files() { # name, file
  cp -av "$2" "$STORAGE/$1"
}
_write_stdin() { # name
  cat - > "$STORAGE/$1"
}

_read() {
  [[ -e "$STORAGE/$NAME" ]] || {
      _msg "No such clipboard"
      return
  }
  [[ -z "$FILE" ]] && stream_out=1
  [ -t 1 ] || stream_out=1

  [[ "$stream_out" -eq 1 ]] && {
    [[ -d "$STORAGE/$NAME" ]] && {
        _msg "$NAME is a directory, needs target [file]"
        exit 1
    }
    _read_stdout "$NAME"
  } || {
    _read_files "$NAME" "$FILE"
  }
}

_read_files() { # name, file
  cp -av "$STORAGE/$1" "$2"
}
_read_stdout() { # name
  cat "$STORAGE/$1"
}

_delete() { # name
  [[ -e "$STORAGE/$1" ]] || {
    _msg No such clipboard
    exit 1
  }
  [[ "$FORCE" -ne 1 ]] && {
    read -p "Really delete $1 ? Break to cancel. " foo
  }
  rm -vrf "$STORAGE/$1"
}

_msg() {
    echo "$@" >&2
}

_get_name() {
    [[ "$ARG1" = "$CMD" ]] && {
        NAME="$ARG2"
    } || {
        NAME="$ARG1"
    }
    [[ -z "$NAME" ]] && NAME=0
    return 0
}

_get_file() {
    [[ "$ARG1" = "$NAME" ]] && {
        FILE="$ARG2"
    }
    [[ "$ARG2" = "$NAME" ]] && {
        FILE="$ARG3"
    }
    return 0
}

for (( i=1; i<=$#; i++ )); do
  [[ "${!i}" = "-h" ]] && _help
  [[ "${!i}" = "--help" ]] && _help
done
_load_config
ARG1="$1"
ARG2="$2"
ARG3="$3"
CMD=list
[[ "$1" = "r" || "$1" = "read" ]] && { CMD=read; ARG1=$CMD; }
[[ "$1" = "w" || "$1" = "write" ]] && { CMD=write; ARG1=$CMD; }
[[ "$1" = "d" || "$1" = "delete" || "$1" = "del" ]] && { CMD=delete; ARG1=$CMD; }
[[ "$1" = "l" || "$1" = "list" ]] && { CMD=list; ARG1=$CMD; }
[[ "$1" = "h" || "$1" = "help" ]] && _help
[[ -n "$1" ]] && [[ -e "$STORAGE"/"$1" ]] && CMD=read
# if stdout redirected, default to read
[ -t 1 ] || CMD=read
# if stdin comes from stream, default to write
[ -t 0 ] || CMD=write

[[ "$CMD" = list ]] && {
    _list
    exit $?
}
_get_name
_get_file
[[ "$CMD" = read ]] && {
    _read
    exit $?
}
[[ "$CMD" = delete ]] && {
    _delete "$NAME"
    exit $?
}
[[ "$CMD" = write ]] && {
    _write
    exit $?
}


# TODO:
#  folders written as TAR
#  content encrypted with conf variable?