#!/usr/bin/env bash
#
# Fetches current weather for Herzogenbuchsee, Switzerland via open-meteo.com.
# No API key required.
#
# WMO weather codes: https://open-meteo.com/en/docs#weathervariables

# Coordinates for Herzogenbuchsee, CH
LAT="47.1897"
LON="7.7058"
# NOTE: MeteoSwiss ICON-CH1 model (~1 km resolution) via open-meteo, matching
# the MeteoSwiss mobile app data source.
API_URL="https://api.open-meteo.com/v1/forecast"
MODEL="meteoswiss_icon_ch1"

. ~/bin/i3blocks/_utils

# Map WMO weather interpretation codes to icons (Nerd Font nf-weather-*)
wmo_icon() {
    local code=$1
    case $code in
        0)            echo "clear" ;;  # Clear sky
        1)            echo "mostly clear" ;;  # Mainly clear
        2)            echo "partly cloudy" ;;  # Partly cloudy
        3)            echo "overcast" ;;  # Overcast
        45|48)            echo "fog" ;;  # Fog / depositing rime fog
        51|53|55)            echo "drizzle" ;;  # Drizzle: light, moderate, dense
        56|57)            echo "freezing drizzle" ;;  # Freezing drizzle: light, dense
        61|63|65)            echo "rain" ;;  # Rain: slight, moderate, heavy
        66|67)            echo "freezing rain" ;;  # Freezing rain: light, heavy
        71|73|75|77)            echo "snow" ;;  # Snow: slight, moderate, heavy, snow grains
        80|81|82)            echo "showers" ;;  # Rain showers: slight, moderate, violent
        85|86)            echo "snow showers" ;;  # Snow showers: slight, heavy
        95)            echo "thunderstorm" ;;  # Thunderstorm
        96|99)            echo "thunderstorm+hail" ;;  # Thunderstorm with hail: slight, heavy
        *)            echo "?" ;;
    esac
}

weather() {
    local response
    response=$(curl -sf         "${API_URL}?latitude=${LAT}&longitude=${LON}&current=temperature_2m,apparent_temperature,weather_code,wind_speed_10m&daily=sunrise,sunset&wind_speed_unit=kmh&timezone=Europe%2FZurich&models=${MODEL}")

    if [[ $? -ne 0 || -z "$response" ]]; then
        echo " N/A"
        exit 0
    fi

    local temp apparent code wind sunrise sunset
    temp=$(echo "$response"     | jq -r '.current.temperature_2m')
    apparent=$(echo "$response" | jq -r '.current.apparent_temperature')
    code=$(echo "$response"     | jq -r '.current.weather_code')
    wind=$(echo "$response"     | jq -r '.current.wind_speed_10m')
    sunrise=$(echo "$response"  | jq -r '.daily.sunrise[0]')
    sunset=$(echo "$response"   | jq -r '.daily.sunset[0]')

    # Compare current time against sunrise/sunset (format: YYYY-MM-DDTHH:MM)
    local now sunrise_epoch sun_label sun_time
    now=$(date +%s)
    sunrise_epoch=$(date -d "$sunrise" +%s)

    if [[ $now -lt $sunrise_epoch ]]; then
        sun_label=""
        sun_time=$(date -d "$sunrise" +%H:%M)
    else
        sun_label=""
        sun_time=$(date -d "$sunset" +%H:%M)
    fi

    local label
    label=$(wmo_icon "$code")

    local bg fg stat

    if [[ $(echo "$temp < 0" | bc -l) == "1" ]]; then
        bg=$frost_bg
        fg=$frost_fg
    elif [[ $(echo "$temp < 8" | bc -l) == "1" ]]; then
        bg=$cold_bg
        fg=$cold_fg
    elif [[ $(echo "$temp >= 28" | bc -l) == "1" ]]; then
        bg=$hot_bg
        fg=$hot_fg
    elif [[ $(echo "$temp >= 22" | bc -l) == "1" ]]; then
        bg=$warm_bg
        fg=$warm_fg
    fi

    # NOTE: apparent temperature shown in parentheses as "feels like"
    stat="$label $(printf '%.0f' "$temp")°C ($(printf '%.0f' "$apparent")°C) $(printf '%.0f' "$wind") km/h $sun_label $sun_time"

    if [[ -n "$bg" ]]; then
        echo -e "OUT <span background="$bg" color="$fg"> $stat </span> "
    else
        echo -e "OUT $stat "
    fi
}

weather