#!/usr/bin/env bash
# Print the current weather as a short icon+temp string, e.g. "🌦️  +83°F".
# Caches the wttr.in response for CACHE_MAX_AGE seconds so the lock screen and
# waybar don't hit the network on every refresh. Override the location with
# WEATHER_CITY or edit CITY below.
set -u

CITY="${WEATHER_CITY:-Denver}"
CACHE_DIR="${XDG_RUNTIME_DIR:-/tmp}"
CACHE="${CACHE_DIR}/wttr.cache"
CACHE_MAX_AGE=1800 # 30 minutes
URL="https://wttr.in/${CITY}?format=%c+%t"

cache_age() {
    [ -f "${CACHE}" ] || return 1
    now=$(date +%s)
    mtime=$(stat -c %Y "${CACHE}")
    [ "$(( now - mtime ))" -lt "${CACHE_MAX_AGE}" ]
}

if cache_age; then
    cat "${CACHE}"
    exit 0
fi

TMP="${CACHE}.tmp.$$"
if curl -fsS --max-time 10 "${URL}" > "${TMP}" 2>/dev/null; then
    mv "${TMP}" "${CACHE}"
    cat "${CACHE}"
else
    rm -f "${TMP}" || true
    # Offline: fall back to whatever we cached last, even if stale.
    [ -f "${CACHE}" ] && cat "${CACHE}"
fi