#!/bin/sh

# Displays today's precipication chance (☔), and daily low (🥶) and high (🌞).
# Usually intended for the statusbar.

weather_report="${XDG_CACHE_HOME:-$HOME/.cache}/weather-report"

# Get a weather report from 'wttr.in' and save it locally.
get_forecast() { curl -sf "wttr.in/$LOCATION" > "$weather_report" || exit 1; }

# Forecast should be updated only once a day
check_forecast() {
	[ -s "$weather_report" ] && [ "$(stat -c %y "$weather_report" 2>/dev/null |
		cut -d' ' -f1)" = "$(date '+%Y-%m-%d')" ]
}

get_precip_chance() {
	sed '16q;d' "$weather_report" | # Extract line 16 from file
		grep -wo "[0-9]*%" |           # Find a sequence of digits followed by '%'
		sort -rn |                     # Sort in descending order
		head -1q                       # Extract first line
}

get_daily_high_low() {
	sed '13q;d' "$weather_report" |   # Extract line 13 from file
		grep -o "m\\([-+]\\)*[0-9]\\+" | # Find temperatures in the format "m<signed number>"
		sed 's/[+m]//g' |                # Remove '+' and 'm'
		sort -n -k 2n |                  # Sort in ascending order
		sed -e 1b -e '$!d'               # Extract the first and last lines
}

show_weather() {
	printf "☔%s 🥶%s° 🌞%s°\n" "$(get_precip_chance)" $(get_daily_high_low)
}

case $BLOCK_BUTTON in
	1) setsid -f "$TERMINAL" -e less -Srf "$weather_report" ;;
	2) get_forecast && show_weather ;;
	3) notify-send "🌈 Weather module" "\- Left click for full forecast.
- Middle click to update forecast.
☔: Chance of rain/snow
🥶: Daily low
🌞: Daily high" ;;
	6) "$TERMINAL" -e "$EDITOR" "$0" ;;
esac

check_forecast || get_forecast

show_weather