#!/usr/bin/env bash

BLACK='\033[0;30m'
GRAY='\033[0;37m'
WHITE='\033[0;97m'
RED='\033[0;91m'
GREEN='\033[0;92m'
YELLOW='\033[0;93m'
BLUE='\033[0;94m'
PURPLE='\033[0;95m'
CYAN='\033[0;96m'

# prints text without special characters
# use it to return string values from functions
function safeprint {
    printf "%s" "$@"
}

# prints text with special characters and resets color
function myprint {
    printf "${GRAY}$@${GRAY}\n"
}

function myprint_quiet {
    #true or false
    local quiet=$1
    local text="$2"
    if [ "$quiet" != true ]; then
        myprint "$text"
    fi
}

# print message and exit
function error {
    myprint "${RED}$@"
    exit 1
}

# asks a question with two options and returns 0 or 1
# usage: `if ask_yn "do something?"`
function ask_yn {
    local answ=""
    myprint "$@ [y/n]"
    read -r answ
    return $([[ "$answ" = [Yy] ]]); 
}

function char_multiply {
    local character="$1"
    local length="$2"
    i=0
    while [ $i -lt $length ]; do
        printf $character
        i=$((i+1))
    done
}

# prints horizontal line occupying whole terminal row
# https://en.wikipedia.org/wiki/Box-drawing_characters
function print_hline {
    local color="$1"
    local character="$2"
    if [ -z "$color" ]; then
        color="${GRAY}"
    fi
    if [ -z "$character" ]; then
        character="-";
    fi
    local term_width=$(tput cols)
    local line_length=$((term_width - 1))
    printf "${color}"
    char_multiply "$character" $line_length
    printf "${GRAY}\n"
}

# prints horizontal line occupying whole terminal row with a given label 
function print_header {
    local color="$1"
    local character="$2"
    local label="$3"
    if [ -z "$color" ]; then
        color="${GRAY}"
    fi
    if [ -z "$character" ]; then
        character="-";
    fi
    local term_width=$(tput cols)
    local label_length=${#label}
    local line_characters_count=$((term_width - label_length - 2))
    local left_line_length=$(( line_characters_count / 2 ))
    local right_line_length=$(( left_line_length - 1 + line_characters_count % 2 ))
    printf "${color}"
    char_multiply "$character" $left_line_length
    printf "[${label}]${color}"
    char_multiply "$character" $right_line_length
    printf "${GRAY}\n"
}