#!/bin/bash

set -euo pipefail

# Versio 0.03 / TK

rawtempdata=$(mktemp)
pricedata=$(mktemp)
finalprices=$(mktemp)
RED='\033[1;31m'
GREEN='\033[1;32m'
YELLOW='\033[0;33m'
NOCOLOR='\033[0m'

currentdate=$(date "+%d-%m-%Y")

# Fetching current data from unofficial API (series there starts from 1:00 Finnish time)
curl -s -L --connect-timeout 3 --retry-delay 0 --retry 3 --max-time 10 "https://www.nordpoolspot.com/api/marketdata/page/10?currency=EUR&endDate=$currentdate" -o "$rawtempdata"
if [ $? -eq 0 ]; then

	# Parsing only prices from JSON reply
        jq '.data.Rows[].Columns[] | select(.CombinedName | contains("FI"))' "$rawtempdata" | grep '"Value"' | \
        sed -r 's/.*: "(.*)".*/\1/' | tr "," "." | awk '{ printf("%.1f\n", ($1/10)*1.24 )}' | head -24 > "$pricedata"

	# Adding hours to the front of prices
	seq -f "%02g:00" 01 24 | paste - "$pricedata" | sed 's/24:00/00:00/' > "$finalprices"

	# Printing hourly prices with ANSI colours (escape codes)
	echo
	echo "Time    Price (snt/kWh, with 24% VAT)"

	while read -r line; do
		price=$(echo "$line" | expand | sed 's/.* //')
		if (( $(echo "$price > 15" |bc -l) )); then # If price is above 15 snt/kWh
			echo -e "${RED}$line${NOCOLOR}"
		elif (( $(echo "$price < 5" |bc -l) )); then # If price is below 5 snt/kWh
			echo -e "${GREEN}$line${NOCOLOR}"
		else
			echo -e "${YELLOW}$line${NOCOLOR}" # Default colour for price if no match
		fi
	done < "$finalprices"

	# Calculating and printing average price
	average=$(cat "$pricedata" | awk '{ sum += $1; n++ } END { if (n > 0) printf("%.1f\n", sum / n); }')
	echo
	echo "Average price:"
	echo "$average snt/kWh"

	# Current price
	hournow=$(date +%0H:00)
	echo
	echo "Price now (snt/kWh):"
	seq -f "%02g:00" 01 24 | paste - "$pricedata" | grep "$hournow"
	echo

	# Example how to use Gnuplot to make a ASCII chart from prices. Quite useless
	#seq -f "%02g:00" 01 24 | paste - "$pricedata" | gnuplot -e "set term dumb 70 20; set tic scale 0; plot '-' with lines notitle"
fi

# Clearing temporary files
rm -f "$rawtempdata" "$pricedata" "$finalprices"