#!/bin/bash

set -e

# FEATURES
# - Doesn't show the sink that is already the default
# - Automatically switches all running input sinks when switching the default sink

# Get the current default sink
SINK_DEFAULT=$(pactl info | ag "Default Sink" | ag -o "(?!.*:)[^\s].*")
# Get the audio sink names
SINK_NAMES=$(pactl list sinks | ag Name | cut --complement -c 1-7)

# Get the index of the default sink
DEFAULT_INDEX=$(printf "%s" "$SINK_NAMES" | ag --number "$SINK_DEFAULT" | sed 's/:.*//' )

# Get the audio sink descriptions
SINK_DESCRIPTIONS=$(pactl list sinks | ag Description | cut --complement -c 1-13 | sed 's/^ \+//' | sed 's/ \+$//')
# Get all the programs that revieve the audio from the sinks
SINK_INPUTS=$(pactl list sink-inputs | ag "Sink Input #")

# Get the descriptions from the sinks without the default sink to display to the user and have the user pick a sink
SINK_DESCRIPTION=$(printf "%s" "$SINK_DESCRIPTIONS" | sed "${DEFAULT_INDEX}d" | dmenu -i -fn "Roboto Mono for Powerline-11" -p "Select sink:")
SINK_DESCRIPTION=$(printf "%s" "$SINK_DESCRIPTION" | sed 's/(/\\(/' | sed 's/)/\\)/')

# Get the index for the answer that the user wrote
DESCRIPTION_INDEX=$(printf "%s\n" "$SINK_DESCRIPTIONS" | ag --number "$SINK_DESCRIPTION" | sed 's/:.*//')
DESCRIPTION_INDEX=$((DESCRIPTION_INDEX - 1)) # Correct the index hihi

# Set the default sink
pactl set-default-sink $DESCRIPTION_INDEX

# Change all the ouputs for the programs that are using the default sink
printf "%s\n" "$SINK_INPUTS" | while read -r SINK_INPUT
do
    # Get the index for the program
    SINK_INPUT_INDEX=$(printf "%s" "$SINK_INPUT" | ag -o "(?!Sink Input#)[0-9]+")
    pactl move-sink-input "$SINK_INPUT_INDEX" "$DESCRIPTION_INDEX"
done