#! /bin/bash

set -e

DIR_DATA="$HOME/var/run/today"
FILE_WEATHER="$DIR_DATA/weather"

mkdir -p "$DIR_DATA"

repeat() {
    x="$1"
    n="$2"
    awk -v x="$x" -v n="$n" 'BEGIN {for (i=1; i<=n; i++) {printf x}}'
}

bar=$(repeat '-' '80')
ts_fmt='+%A, %Y %B %d, %H:%M:%S'
ts_lang='el_GR.UTF-8'
timestamp_local=$(LANG="$ts_lang"                 date "$ts_fmt")
timestamp_west=$( LANG="$ts_lang" TZ='US/Pacific' date "$ts_fmt")
timestamp_pl=$(   LANG="$ts_lang" TZ='Poland'     date "$ts_fmt")
timestamp_nz=$(   LANG="$ts_lang" TZ='NZ'         date "$ts_fmt")

ip_addresses=$(
    ip addr \
    | awk '
        /^[0-9]+:/ {
            interface = $2
            sub(":$", "", interface)
            interfaces[++interface_count] = interface
        }

        /^ +inet +/ {
            addr = $2
            sub("/[0-9]+$", "", addr)
            addrs[interface] = addr
        }

        END {
            for (i=1; i<=interface_count; i++) {
                interface = interfaces[i]
                print interface, addrs[interface]
            }
        }' \
    | column -t
)

weather_fetch() {
    curl "http://wttr.in/${ZIP_CODE}?1" \
    1> "$FILE_WEATHER" \
    2> /dev/null
}

weather_file_age() {
    echo $(( $(date +%s) - $(stat -c '%Y' "$FILE_WEATHER") ))
}

weather_get_or_fetch() {
    weather_file_age_limit=$(( 3 * 60 * 60 ))
    if [[ ! -e $FILE_WEATHER || weather_file_age -ge $weather_file_age_limit ]]
    then
        weather_fetch
    fi
    cat "$FILE_WEATHER"
}

weather="$(weather_get_or_fetch)"

clear
#LANG="$ts_lang" ncal -M $(date +%Y)
LANG="$ts_lang" ncal -M
echo "$bar"
(
    echo 'LOCAL'       ',' "$timestamp_local"
    echo 'Pacific'     ',' "$timestamp_west"
    echo 'Poland'      ',' "$timestamp_pl"
    echo 'New Zealand' ',' "$timestamp_nz"
) \
| column -ts,
echo "$bar"
echo "$ip_addresses"
echo "$bar"
echo ''
echo "Fetched on: $(stat -c %y $FILE_WEATHER)"
echo "$weather"
echo ''