#! /bin/bash

set -e

consume() {
    pipe="$1"
    debug="$2"
    dir_bin="$3"
    prefixes_of_net_interfaces_to_show="$4"
    tail -f "$pipe" \
    | stdbuf -o L "$dir_bin"/khatus_controller \
        -v opt_debug="$debug" \
        -v opt_mpd_song_max_chars=10 \
        -v opt_prefixes_of_net_interfaces_to_show="$prefixes_of_net_interfaces_to_show"
}

spawn() {
    pipe="$1"
    dir_bin="$2"
    cmd="$3"
    msg_head="$4"
    interval="$5"
    while true; do
        "$dir_bin"/$cmd | while read line; do
            echo "${msg_head} $line" > "$pipe"
        done
        sleep "$interval"
    done &
}

main() {
    # Defaults
    debug=0
    dir_bin="$HOME/bin"
    dir_data=$(mktemp -d)
    weather_station_id='KJFK'
    screen_brightness_device_name='acpi_video0'
    prefixes_of_net_interfaces_to_show='w'  # comma-separated
    disk_space_device='/'
    disk_io_device='sda'
    thermal_zone=0
    fan_path='/proc/acpi/ibm/fan'

    interval_inp_datetime=1
    interval_inp_brightness=1
    interval_inp_weather=$(( 30 * 60))  # 30 minutes
    interval_inp_mpd_state=1
    interval_inp_mpd_song=1
    interval_inp_volume=1
    interval_inp_bluetooth=5
    interval_inp_net_wifi=5
    interval_inp_net_io=1
    interval_inp_disk_space=5
    interval_inp_disk_io=1
    interval_inp_loadavg=1
    interval_inp_temp=1
    interval_inp_fan=1
    interval_inp_mem=1
    interval_inp_energy=1
    interval_outp_bar=1

    # User-overrides
    long_options=''
    long_options+='debug'
    long_options+=',bin_dir:'
    long_options+=',data_dir:'
    long_options+=',weather_station:'
    long_options+=',screen_device:'
    long_options+=',prefixes_of_net_interfaces_to_show:'
    long_options+=',disk_space_device:'
    long_options+=',disk_io_device:'
    long_options+=',thermal_zone:'
    long_options+=',fan_path:'
    long_options+=',interval_inp_datetime:'
    long_options+=',interval_inp_brightness:'
    long_options+=',interval_inp_weather:'
    long_options+=',interval_inp_mpd_state:'
    long_options+=',interval_inp_mpd_song:'
    long_options+=',interval_inp_volume:'
    long_options+=',interval_inp_bluetooth:'
    long_options+=',interval_inp_net_wifi:'
    long_options+=',interval_inp_net_io:'
    long_options+=',interval_inp_disk_space:'
    long_options+=',interval_inp_disk_io:'
    long_options+=',interval_inp_loadavg:'
    long_options+=',interval_inp_temp:'
    long_options+=',interval_inp_fan:'
    long_options+=',interval_inp_mem:'
    long_options+=',interval_inp_energy:'
    long_options+=',interval_outp_bar:'
    OPTS=$(
        getopt \
            -o 'd' \
            -l $long_options \
            -- "$@"
    )
    eval set -- "$OPTS"
    while true
    do
        case "$1" in
            -d|--debug)
                debug=1
                shift
                ;;
            --bin_dir)
                dir_bin="$2"
                shift 2
                ;;
            --data_dir)
                dir_data="$2"
                shift 2
                ;;
            --weather_station)
                weather_station_id="$2"
                shift 2
                ;;
            --screen_device)
                screen_brightness_device_name="$2"
                shift 2
                ;;
            --prefixes_of_net_interfaces_to_show)
                prefixes_of_net_interfaces_to_show="$2"
                shift 2
                ;;
            --disk_space_device)
                disk_space_device="$2"
                shift 2
                ;;
            --disk_io_device)
                disk_io_device="$2"
                shift 2
                ;;
            --thermal_zone)
                thermal_zone="$2"
                shift 2
                ;;
            --fan_path)
                fan_path="$2"
                shift 2
                ;;
            --interval_inp_datetime)
                interval_inp_datetime="$2"
                shift 2
                ;;
            --interval_inp_brightness)
                interval_inp_brightness="$2"
                shift 2
                ;;
            --interval_inp_weather)
                interval_inp_weather="$2"
                shift 2
                ;;
            --interval_inp_mpd_state)
                interval_inp_mpd_state="$2"
                shift 2
                ;;
            --interval_inp_mpd_song)
                interval_inp_mpd_song="$2"
                shift 2
                ;;
            --interval_inp_volume)
                interval_inp_volume="$2"
                shift 2
                ;;
            --interval_inp_bluetooth)
                interval_inp_bluetooth="$2"
                shift 2
                ;;
            --interval_inp_net_wifi)
                interval_inp_net_wifi="$2"
                shift 2
                ;;
            --interval_inp_net_io)
                interval_inp_net_io="$2"
                shift 2
                ;;
            --interval_inp_disk_space)
                interval_inp_disk_space="$2"
                shift 2
                ;;
            --interval_inp_disk_io)
                interval_inp_disk_io="$2"
                shift 2
                ;;
            --interval_inp_loadavg)
                interval_inp_loadavg="$2"
                shift 2
                ;;
            --interval_inp_temp)
                interval_inp_temp="$2"
                shift 2
                ;;
            --interval_inp_fan)
                interval_inp_fan="$2"
                shift 2
                ;;
            --interval_inp_mem)
                interval_inp_mem="$2"
                shift 2
                ;;
            --interval_inp_energy)
                interval_inp_energy="$2"
                shift 2
                ;;
            --interval_outp_bar)
                interval_outp_bar="$2"
                shift 2
                ;;
            --)
                shift
                break
                ;;
        esac
    done

    pipe="$dir_data/khatus_data_pipe"
    screen_brightness_device_path='/sys/class/backlight'
    screen_brightness_device_path+="/$screen_brightness_device_name"

    ( echo "Khatus starting with the following parameters:"
      ( echo "    debug|= $debug"
        echo "    dir_bin|= $dir_bin"
        echo "    dir_data|= $dir_data"
        echo "    pipe|= $pipe"
        echo "    screen_brightness_device_name|= $screen_brightness_device_name"
        echo "    screen_brightness_device_path|= $screen_brightness_device_path"
        echo "    weather_station_id|= $weather_station_id"
        echo "    prefixes_of_net_interfaces_to_show|= $prefixes_of_net_interfaces_to_show"
        echo "    disk_space_device|= $disk_space_device"
        echo "    disk_io_device|= $disk_io_device"
        echo "    thermal_zone|= $thermal_zone"
        echo "    fan_path|= $fan_path"
      ) | column -ts\|
      echo ''
    ) >&2

    mkdir -p "$dir_data"
    rm -f "$pipe"
    mkfifo "$pipe"

    cmd_sens_screen_brightness='khatus_sensor_screen_brightness'
    cmd_sens_screen_brightness+=" $screen_brightness_device_path"

    cmd_sens_weather="khatus_sensor_weather $weather_station_id"

    cmd_sens_disk_space="khatus_sensor_disk_space $disk_space_device"

    cmd_sens_disk_io="khatus_sensor_disk_io $disk_io_device"

    cmd_sens_temperature="khatus_sensor_temperature $thermal_zone"

    cmd_sens_fan="khatus_sensor_fan $fan_path"

    # TODO: Redirect each worker's stderr to a dedicated log file
    spawn "$pipe" "$dir_bin" khatus_sensor_datetime        'in:DATE_TIME'         $interval_inp_datetime
    spawn "$pipe" "$dir_bin" "$cmd_sens_screen_brightness" 'in:SCREEN_BRIGHTNESS' $interval_inp_brightness
    spawn "$pipe" "$dir_bin" "$cmd_sens_weather"           'in:WEATHER'           $interval_inp_weather
    spawn "$pipe" "$dir_bin" khatus_sensor_mpd_state       'in:MPD_STATE'         $interval_inp_mpd_state
    spawn "$pipe" "$dir_bin" khatus_sensor_mpd_song        'in:MPD_SONG'          $interval_inp_mpd_song
    spawn "$pipe" "$dir_bin" khatus_sensor_volume          'in:VOLUME'            $interval_inp_volume
    spawn "$pipe" "$dir_bin" khatus_sensor_bluetooth_power 'in:BLUETOOTH_POWER'   $interval_inp_bluetooth
    spawn "$pipe" "$dir_bin" khatus_sensor_net_wifi_status 'in:NET_WIFI_STATUS'   $interval_inp_net_wifi
    spawn "$pipe" "$dir_bin" khatus_sensor_net_addr_io     'in:NET_ADDR_IO'       $interval_inp_net_io
    spawn "$pipe" "$dir_bin" "$cmd_sens_disk_space"        'in:DISK_SPACE'        $interval_inp_disk_space
    spawn "$pipe" "$dir_bin" "$cmd_sens_disk_io"           'in:DISK_IO'           $interval_inp_disk_io
    spawn "$pipe" "$dir_bin" khatus_sensor_loadavg         'in:LOAD_AVG'          $interval_inp_loadavg
    spawn "$pipe" "$dir_bin" "$cmd_sens_temperature"       'in:TEMPERATURE'       $interval_inp_temp
    spawn "$pipe" "$dir_bin" "$cmd_sens_fan"               'in:FAN'               $interval_inp_fan
    spawn "$pipe" "$dir_bin" khatus_sensor_memory          'in:MEMORY'            $interval_inp_mem
    spawn "$pipe" "$dir_bin" khatus_sensor_energy          'in:ENERGY'            $interval_inp_energy
    spawn "$pipe" "$dir_bin" khatus_sensor_bar_req         'out:BAR'              $interval_outp_bar

    consume \
      "$pipe" \
      "$debug" \
      "$dir_bin" \
      "$prefixes_of_net_interfaces_to_show"
}

main $@