#!/bin/bash

function call_xrandr() {
    xrandr_opts=''

    for display in "${!display_configurations[@]}"; do
        echo "Setting ${display} to ${display_configurations[$display]}"
        xrandr_opts="${xrandr_opts} --output ${display} ${display_configurations[$display]}"
    done

    # Word splitting here is important, so it's not in quotes.
    xrandr $xrandr_opts
}

function display_config() {
    display_name="$1"
    display_config="$2"

    if [[ ${display_configurations[$display_name]} = '' ]]; then
        echo "Tried to configure invalid display ${display_name}."
        exit 1
    fi

    if [[ ${connected_displays[$display_name]} != 'yes' ]]; then
        echo "Tried to configure disconnected display ${display_name}."
        exit 1
    fi

    display_configurations[$display_name]="$display_config"
}

declare -A display_configurations
declare -A connected_displays

if [ "$1" = '-a' ]; then
    switch_audio='yes'
    video_mode="$2"
else
    video_mode="$1"
fi


while read -r display_line; do
    display_name="$(echo "$display_line" | cut -d " " -f 1)"

    if [[ "$(echo "$display_line" | cut -d " " -f 2)" = 'connected' ]]; then
        connected_displays[$display_name]='yes'
    else
        connected_displays[$display_name]='no'
    fi

    display_configurations[$display_name]=' --off'
done <<< "$(xrandr | grep connected)"

# TODO: I'm very lazy, so build a method that automatically figures out which HDMI
#   output to use if there's only one.
case $video_mode in
    'lvds-hdmi1')
        display_config 'LVDS1' '--primary --mode 1366x768'
        display_config 'HDMI1' '--mode 1280x720 --above LVDS1'

        if [ "$switch_audio" = 'yes' ]; then
            audio_profile='output:hdmi-stereo'
        fi
        ;;
    'hdmi1')
        display_config 'HDMI1' '--primary --mode 1280x720'

        if [ "$switch_audio" = 'yes' ]; then
            audio_profile='output:hdmi-stereo'
        fi
        ;;
    'lvds')
        display_config 'LVDS1' '--primary --mode 1366x768'
        if [ "$switch_audio" = 'yes' ]; then
            audio_profile='output:analog-stereo'
        fi
        ;;

    # This is intended to be a quick rescue mode.
    '') 
        display_config 'LVDS1' '--primary --mode 1377x768'
        audio_profile='output:analog-stereo'
        ;;
    *)
        echo "No configuration defined for ${video_mode}"
        exit 1
        ;;
esac

call_xrandr
if [ "$switch_audio" = 'yes' ]; then
    ponymix -c 0 set-profile "${audio_profile}"
fi