#!/bin/bash
# Default variables
token_symbol=""
round=""
multiplier=""

# Options
. <(wget -qO- https://raw.githubusercontent.com/SecorD0/utils/main/colors.sh) --
option_value(){ echo "$1" | sed -e 's%^--[^=]*=%%g; s%^-[^=]*=%%g'; }
while test $# -gt 0; do
	case "$1" in
	-h|--help)
		. <(wget -qO- https://raw.githubusercontent.com/SecorD0/utils/main/logo.sh)
		echo
		echo -e "${C_LGn}Functionality${RES}: the script parses a token price from CoinGecko page"
		echo
		echo -e "${C_LGn}Usage${RES}: script ${C_LGn}[OPTIONS]${RES}"
		echo
		echo -e "${C_LGn}Options${RES}:"
		echo -e "  -h,  --help                 show the help page"
		echo -e "  -ts, --token-symbol SYMBOL  SYMBOL of token to parse the price. E.g. ${C_LGn}BTC${RES}, ${C_LGn}eth${RES}, ${C_LGn}BnB${RES}"
		echo -e "  -m,  --multiplier AMOUNT    AMOUNT of tokens to calculate their value. You can separate the digits with the spacebar: ${C_LGn}\"1 000\"${RES}, ${C_LGn}\"100 000\"${RES}"
		echo -e "  -r,  --round NUMBER         round the value to NUMBER decimal places"
		echo
		echo -e "You can use either \"=\" or \" \" as an option and value ${C_LGn}delimiter${RES}"
		echo
		echo -e "${C_LGn}Useful URLs${RES}:"
		echo -e "https://github.com/SecorD0/utils/blob/main/parsers/token_price.sh - script URL"
		echo -e "https://t.me/OnePackage — noderun and tech community"
		echo -e "https://learning.1package.io — guides and articles"
		echo -e "https://teletype.in/@letskynode — guides and articles"
		echo
		return 0 2>/dev/null; exit 0
		;;
	-ts*|--token-symbol*)
		if ! grep -q "=" <<< "$1"; then shift; fi
		token_symbol=`option_value "$1"`
		shift
		;;
	-m*|--multiplier*)
		if ! grep -q "=" <<< "$1"; then shift; fi
		multiplier=`option_value "$1"`
		shift
		;;
	-r*|--round*)
		if ! grep -q "=" <<< "$1"; then shift; fi
		round=`option_value "$1"`
		shift
		;;
	*|--)
		break
		;;
	esac
done

# Functions
printf_n(){ printf "$1\n" "${@:2}"; }
main() {
	if [ ! -n "$token_symbol" ]; then
		printf_n "${C_R}You didn't specify a token symbol via${RES} -ts ${C_R}option!${RES}"
		return 1 2>/dev/null; exit 1
	fi
	if [ -n "$multiplier" ]; then
		local multiplier=`echo "$multiplier" | tr -d ' ' | tr ',' '.'`
		if printf "%f" "$multiplier" &>/dev/null; then
			local multiplier=`printf "%f" $multiplier`
		else
			printf_n "${C_R}The specified multiplier is not a number!${RES}"
			return 1 2>/dev/null; exit 1
		fi
	fi
	if [ -n "$round" ]; then
		if printf "%d" "$round" &>/dev/null; then
			local round=`printf "%d" $round`
		else
			printf_n "${C_R}The specified number of decimal places is not a number!${RES}"
			return 1 2>/dev/null; exit 1
		fi
	fi
	local project_id=`wget -qO- https://api.coingecko.com/api/v3/coins/list | jq -r '[.[] | select(.symbol=="'${token_symbol,,}'")][0].id'`
	if [ ! -n "$project_id" ]; then
		printf_n "${C_R}There is no such token!${RES}"
		return 1 2>/dev/null; exit 1
	fi
	local price=`wget -qO- https://api.coingecko.com/api/v3/coins/${project_id} | jq '.market_data.current_price.usd' 2>/dev/null`
	if [ -n "$price" ]; then
		if [ -n "$multiplier" ]; then
			sudo apt install bc -y &>/dev/null
			local result=`bc -l <<< "$price*$multiplier"`
		else
			local result="$price"
		fi
		if [ -n "$round" ]; then
			printf_n "%.${round}f" "$result"
		else
			printf_n "%f" "$result"
		fi
	else
		printf_n "${C_R}There is no such token!${RES}"
		return 1 2>/dev/null; exit 1
	fi
}

# Actions
sudo apt install wget jq -y &>/dev/null
main