#!/bin/bash

set -e
_help() {
  SELF=$( basename "$0" )
  echo "MFL CLI v.{{ version }}
  Commands:

    (l)ist     [default] List names of files
    (w)rite    Save to share, read from stdin/file/folder
    (d)elete   Delete an entry
    show       Show details on file
    upload     Get URL for uploads [no arguments]
    autocomplete  Get Bash autocompletion script
    update     Update self

    -d  max days to keep      (default 30)
    -m  max downloads to keep (default 9999,  -1 to disable)

  Filename:
    When writing to share:
      File or folder to read from. If omitted: stdin.

  Usage:
    echo my data | $SELF w file.ext  # writes data with name: file.ext
    $SELF w file.ext # sends file keeping its name

  Config:
    set: MFL_ROOTURL, MFL_TOKEN
"
  exit
}


_load_config() {
  MFL_TOKEN="${MFL_TOKEN:-{{ token }}}"
  MFL_ROOTURL="${MFL_ROOTURL:-{{ rooturl }}}"
}

_update_client() {
  echo "Current version:"
  "$0" --help | head -n 1
  echo "Updating from $MFL_ROOTURL"
  curl -fLo "$0" -H "Secret: $MFL_TOKEN" "$MFL_ROOTURL/script/mfl"
  err=$?
  chmod +x "$0"
  echo "Downloaded version:"
  "$0" --help | head -n 1
  exit $err
}

_list() {
  curl -fL -w "\n" -s -H "Secret: $MFL_TOKEN" "$MFL_ROOTURL"/ls
}

#~ _simple_list() {
  #~ curl -fL -w "\n" -s -H "Secret: $MFL_TOKEN" "$MFL_ROOTURL"/ls | sed 's/.*http/http/' | tail -n +3
#~ }

_write() {
  # stdin is open
  [ -t 0 ] || {
    stream_in=1
    [[ -z "$NAME" ]] && {
      _msg Output filename not set
      exit 1
    }
  }
  # no file mentioned, use the name as file
  [[ -z "$FILE" ]] && {
      [[ -e "$NAME" ]] && {
          # NAME is actually the file, reverse roles
          FILE="${NAME}"
          NAME=$( basename "${NAME}" )
      }
  }
  [[ -e "$FILE" ]] && {
    # Input file exists, dont use stream
    stream_in=0
  }

  [[ $stream_in -ne 1 ]] && [[ -z "$FILE" ]] && {
    _msg File to read needed, or use stdin
    exit 1
  }
  _msg "Writing $NAME"
  [[ "$stream_in" -eq 1 ]] && {
    _write_stdin "$NAME"
    return $?
  }

  [[ -d "$FILE" ]] && {
    [[ "${NAME,,}" = *".tar" ]] || NAME="${NAME}".tar
    _write_folder "$NAME" "$FILE"
    return $?
  }

  [[ -f "$FILE" ]] || {
      _msg "No such file"
      exit 1
  }
  _write_file "$NAME" "$FILE"
}

_write_folder() { # name, file
  tar c "$2" | \
  curl -fL -w "\n" -F file="@-" -X POST \
    -H "Name: $1" \
    -H "Max-Downloads: $MAXDL" \
    -H "Expires-Days: $MAXDAYS" \
    -H "Secret: $MFL_TOKEN" \
    "$MFL_ROOTURL"/upload
}
_write_file() { # name, file
  curl -fL -w "\n" -F file="@$2" -X POST \
    -H "Name: $1" \
    -H "Max-Downloads: $MAXDL" \
    -H "Expires-Days: $MAXDAYS" \
    -H "Secret: $MFL_TOKEN" \
    "$MFL_ROOTURL"/upload
}
_write_stdin() { # name
  cat - \
  curl -fL -w "\n" -F file="@-" -X POST \
    -H "Name: $1" \
    -H "Max-Downloads: $MAXDL" \
    -H "Expires-Days: $MAXDAYS" \
    -H "Secret: $MFL_TOKEN" \
    "$MFL_ROOTURL"/upload
}

_delete() { # name
  read -p "Sure to delete: $1 ? Break to exit " foo
  curl -fL -w "\n" \
    -H "Secret: $MFL_TOKEN" \
    "$MFL_ROOTURL"/delete/"$1"
}

_details() { # name
  curl -fL -w "\n" \
    -H "Secret: $MFL_TOKEN" \
    "$MFL_ROOTURL"/details/"$1"
}

_maintain() {
  curl -fL -w "\n" \
    -H "Secret: $MFL_TOKEN" \
    "$MFL_ROOTURL"/maintenance
}


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


_get_completer() {
  self=$( basename $( readlink -f "$0" ) )
  echo '_MFL_EXEC_complete() {
local curr_arg
curr_arg=${COMP_WORDS[COMP_CWORD]}
if [[ $COMP_CWORD -eq 1 ]]; then
  COMPREPLY=( $(compgen -W "help autocomplete list write delete update" -- $curr_arg ) );
fi
if [[ $COMP_CWORD -eq 2 ]]; then
  case ${COMP_WORDS[$(( $COMP_CWORD - 1 ))]} in
    delete)
      local remotelist=$( eval MFL_EXEC simplelist )
      COMPREPLY=( $(compgen -W "$remotelist" -- $curr_arg ) );
    ;;
    w*)
      COMPREPLY=( $(compgen -f -d -- $curr_arg ) );
    ;;
  esac
fi
if [[ $COMP_CWORD -eq 3 ]]; then
  COMPREPLY=( $(compgen -f -d -- $curr_arg ) );
fi
}
complete -F _MFL_EXEC_complete MFL_EXEC
# Run me as: source <( MFL_EXEC autocomplete )
' | sed "s,MFL_EXEC,$self,g"
  exit 0
}

_load_config
for (( i=1; i<=$#; i++ )); do
  [[ "${!i}" = "-h" ]] && _help
  [[ "${!i}" = "--help" ]] && _help
done

MAXDL=9999
MAXDAYS=30
CMD=list
# if stdin comes from stream, default to write
[ -t 0 ] || CMD=help
for (( i=2; i<=$#; i++ )); do
  j=$(( i + 1 ))
  [[ "${!i}" = "-m" ]] && { MAXDL=${!j}; i=$j; continue; }
  [[ "${!i}" = "-d" ]] && { MAXDAYS=${!j}; i=$j; continue; }
  if [[ -z "$FILE" ]]; then
    FILE="${!i}"
    continue
  fi
  if [[ -z "$NAME" ]]; then
    NAME="${!i}"
  fi
done
if [[ -z "$NAME" ]]; then
  if [[ -n "$FILE" ]]; then
      NAME="$( basename ${FILE} )"
  fi
fi

[[ "$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; }
[[ "$1" = "show" ]] && { CMD=details; ARG1=$CMD; }
[[ "$1" = "maintain" ]] && { CMD=maintain; }
[[ "$1" = "simplelist" ]] && { CMD=simple_list; ARG1=$CMD; }
[[ "$1" = "autocomplete" ]] && { _get_completer; }
[[ "$1" = "update" ]] && { _update_client; }
[[ "$1" = "upload" ]] && { _upload_url; }
[[ "$1" = "self" ]] && { _self_url; }
[[ "$1" = "h" || "$1" = "help" ]] && CMD=help

[[ "$CMD" = help ]] && {
    _help
    exit $?
}

[[ "$CMD" = list ]] && {
    _list
    exit $?
}

[[ "$CMD" = simple_list ]] && {
    _simple_list
    exit $?
}

[[ "$CMD" = delete ]] && {
    if [[ -z "$NAME" ]]; then
      echo Missing key / file name
      _simple_list | sed 's,^'${ROOTURL}/',,'
      echo Add secret key as argument
      exit
    fi

    _delete "$NAME"
    exit $?
}
[[ "$CMD" = write ]] && {
    _write
    exit $?
}
[[ "$CMD" = details ]] && {
    _details "$FILE"
    exit $?
}
[[ "$CMD" = maintain ]] && {
    _maintain
    exit $?
}