# CONSTANTS

# MARGIN=0
PADDING=0
ANSI_RESET='\e[0m'

BLOCK_CONTINUATION_COL=
BLOCK_CONTINUATION_SYMBOL=╦

declare -A STYLE_VARIANTS
STYLE_VARIANTS[BOLD]='\e[1m'
STYLE_VARIANTS[ITALIC]='\e[3m'
STYLE_VARIANTS[UNDERLINE]='\e[4m'
STYLE_VARIANTS[STRIKETHROUGH]='\e[9m'

declare -A FG_COLORS
FG_COLORS[BLACK]='\e[30m'
FG_COLORS[RED]='\e[31m'
FG_COLORS[GREEN]='\e[32m'
FG_COLORS[YELLOW]='\e[33m'
FG_COLORS[BLUE]='\e[34m'
FG_COLORS[PURPLE]='\e[35m'
FG_COLORS[CYAN]='\e[36m'
FG_COLORS[WHITE]='\e[37m'
FG_COLORS[GRAY]='\e[90m'
FG_COLORS[MAGENTA]='\e[95m'

declare -A BG_COLORS
BG_COLORS[BLACK]='\e[40m'
BG_COLORS[RED]='\e[41m'
BG_COLORS[GREEN]='\e[42m'
BG_COLORS[YELLOW]='\e[43m'
BG_COLORS[BLUE]='\e[44m'
BG_COLORS[PURPLE]='\e[45m'
BG_COLORS[CYAN]='\e[46m'
BG_COLORS[WHITE]='\e[47m'
# BG_COLORS["GRAY"]='\e[90m'
# BG_COLORS["MAGENTA"]='\e[95m'

# FUNCTIONS

function ansi_reset {
  PADDING=0
  unset PADDING_LEFT PADDING_RIGHT BG FG
}

function ansi_length {
  local clean_text
  clean_text=$(echo "$1" | sed 's/\x1B\[[0-9;]*m//g')
  echo "${#clean_text}"
}

function style_padding {
  local left right
  local padding_left=${PADDING_LEFT:-$PADDING}
  local padding_right=${PADDING_RIGHT:-$PADDING}

  left=$(for _ in $(seq 1 "${padding_left}"); do builtin echo -n ' '; done)
  style_ansi "$left"

  style_ansi "$1"

  right=$(for _ in $(seq 1 "${padding_right}"); do builtin echo -n ' '; done)
  style_ansi "$right"
}

function _style_fg {
  [[ -n $1 ]] && echo "${FG_COLORS[$1]}" || true
}

function _style_variant {
  [[ -n $1 ]] && echo "${STYLE_VARIANTS[$1]}" || true
}

function _style_bg {
  if [[ -n "$1" ]]; then
    [[ -v BG_COLORS[$1] ]] && echo "${BG_COLORS[$1]}" || >&2 echo "unknown BG value: $1"
  fi
}

function style_ansi {
  local fg bg variant
  fg=$(_style_fg "${FG:-}") && [[ -n $fg ]] && builtin echo -en "$fg"
  bg=$(_style_bg "${BG:-}") && [[ -n $bg ]] && builtin echo -en "$bg"
  variant=$(_style_variant "${STYLE:-}") && [[ -n $variant ]] && builtin echo -en "$variant"
  builtin echo -en "$1"
  [[ -n $fg || -n $bg || -n $variant ]] && builtin echo -en "$ANSI_RESET"
  true
}

function style_block {
  local content length top bottom i

  content=$(style_padding "$1")
  length=$(ansi_length "$content")

  top=$(
    builtin echo -n "╔"
    for _ in $(seq 1 "${length}"); do builtin echo -n '═'; done
    builtin echo "╗"
  )
  style_ansi "${top}" && builtin echo

  style_ansi "║"
  style_ansi "${content}"
  style_ansi "║" && builtin echo

  bottom=$(
    builtin echo -n "╚"
    for i in $(seq 1 "${length}"); do
      if [[ $i == "$BLOCK_CONTINUATION_COL" ]]; then
        builtin echo -n "$BLOCK_CONTINUATION_SYMBOL"
      else
        builtin echo -n '═'
      fi
    done
    builtin echo "╝"
  )
  style_ansi "${bottom}" && builtin echo
}