#!/usr/bin/env bash

_prettytable_char_top_left="┌"
_prettytable_char_horizontal="─"
_prettytable_char_vertical="│"
_prettytable_char_bottom_left="└"
_prettytable_char_bottom_right="┘"
_prettytable_char_top_right="┐"
_prettytable_char_vertical_horizontal_left="├"
_prettytable_char_vertical_horizontal_right="┤"
_prettytable_char_vertical_horizontal_top="┬"
_prettytable_char_vertical_horizontal_bottom="┴"
_prettytable_char_vertical_horizontal="┼"


# Escape codes

# Default colors
_prettytable_color_blue="0;34"
_prettytable_color_green="0;32"
_prettytable_color_cyan="0;36"
_prettytable_color_red="0;31"
_prettytable_color_purple="0;35"
_prettytable_color_yellow="0;33"
_prettytable_color_gray="1;30"
_prettytable_color_light_blue="1;34"
_prettytable_color_light_green="1;32"
_prettytable_color_light_cyan="1;36"
_prettytable_color_light_red="1;31"
_prettytable_color_light_purple="1;35"
_prettytable_color_light_yellow="1;33"
_prettytable_color_light_gray="0;37"

# Somewhat special colors
_prettytable_color_black="0;30"
_prettytable_color_white="1;37"
_prettytable_color_none="0"

function _prettytable_prettify_lines() {
    cat - | sed -e "s@^@${_prettytable_char_vertical}@;s@\$@	@;s@	@	${_prettytable_char_vertical}@g"
}

function _prettytable_fix_border_lines() {
    cat - | sed -e "1s@ @${_prettytable_char_horizontal}@g;3s@ @${_prettytable_char_horizontal}@g;\$s@ @${_prettytable_char_horizontal}@g"
}

function _prettytable_colorize_lines() {
    local color="$1"
    local range="$2"
    local ansicolor="$(eval "echo \${_prettytable_color_${color}}")"

    cat - | sed -e "${range}s@\\([^${_prettytable_char_vertical}]\\{1,\\}\\)@"$'\E'"[${ansicolor}m\1"$'\E'"[${_prettytable_color_none}m@g"
}

function prettytable() {
    local cols="${1}"
    local color="${2:-none}"
    local input="$(cat -)"
    local header="$(echo -e "${input}"|head -n1)"
    local body="$(echo -e "${input}"|tail -n+2)"
    {
        # Top border
        echo -n "${_prettytable_char_top_left}"
        for i in $(seq 2 ${cols}); do
            echo -ne "\t${_prettytable_char_vertical_horizontal_top}"
        done
        echo -e "\t${_prettytable_char_top_right}"

        echo -e "${header}" | _prettytable_prettify_lines

        # Header/Body delimiter
        echo -n "${_prettytable_char_vertical_horizontal_left}"
        for i in $(seq 2 ${cols}); do
            echo -ne "\t${_prettytable_char_vertical_horizontal}"
        done
        echo -e "\t${_prettytable_char_vertical_horizontal_right}"

        echo -e "${body}" | _prettytable_prettify_lines

        # Bottom border
        echo -n "${_prettytable_char_bottom_left}"
        for i in $(seq 2 ${cols}); do
            echo -ne "\t${_prettytable_char_vertical_horizontal_bottom}"
        done
        echo -e "\t${_prettytable_char_bottom_right}"
    } | column -t -s $'\t' | _prettytable_fix_border_lines | _prettytable_colorize_lines "${color}" "2"
}

table_output() {
  local n_cols=$#
  {  
    printf "$(join_by "\t" "$@")\n"
    cat -
  } | prettytable "$n_cols" "${TABLE_HEADER_COLOR:-gray}"
}