#!/bin/bash
# MAIN: CREATE/UPDATE PLAYLIST
# Creates and/or updates a playlist to reflect what's in main-audio_queued folder


# Includes and Declarations (global variables, formatting, and functions)
source "${APPLICATION_ROOT}/scripts/system/system-functions"
source "${APPLICATION_ROOT}/scripts/system/system-declarations"


# If playlist exists, delete it.
if test -f "$PLAYLIST_PATH"; then
    sudo rm "$PLAYLIST_PATH";
fi
sudo touch "$PLAYLIST_PATH";


# Create array of directory files
declare -a FILES_ARRAY=()
for FILE in "$AUDIO_QUEUED_DIRECTORY"/*.mp3 ; do
	FILES_ARRAY+=("$FILE")
done


# Check if array is empty, then construct accordingly
if (( ${#FILES_ARRAY[@]} )); then
	
	# If files: Append header
	CURRENT_DATE=$(date +"%D %T")
	echo "# Playlist created date:" | sudo tee -a "$PLAYLIST_PATH" >/dev/null
	echo "# $CURRENT_DATE" | sudo tee -a "$PLAYLIST_PATH" >/dev/null
	echo "#" | sudo tee -a "$PLAYLIST_PATH" >/dev/null

	# Then append tracks
	echo "# Playlist tracks:" | sudo tee -a "$PLAYLIST_PATH" >/dev/null
	for TRACK in "${FILES_ARRAY[@]}" ; do
		echo "$TRACK" | sudo tee -a "$PLAYLIST_PATH" >/dev/null
	done

else 

	# If no files: Append header
	CURRENT_DATE=$(date +"%D %T")
	echo "# Playlist date created:" | sudo tee -a "$PLAYLIST_PATH" >/dev/null
	echo "# $CURRENT_DATE" | sudo tee -a "$PLAYLIST_PATH" >/dev/null
	echo "#" | sudo tee -a "$PLAYLIST_PATH" >/dev/null
	
	# Then append empty tracklist
	echo "# Playlist tracks:" | sudo tee -a "$PLAYLIST_PATH" >/dev/null
	echo "# (((--- PLAYLIST EMPTY ---)))" | sudo tee -a "$PLAYLIST_PATH" >/dev/null
	echo "#" | sudo tee -a "$PLAYLIST_PATH" >/dev/null
	echo "#" | sudo tee -a "$PLAYLIST_PATH" >/dev/null
	error_message 

fi


# Set permissions after file creation
sudo chmod 755 "$PLAYLIST_PATH";
sudo chown "$APPLICATION_FILE_OWNER" "$PLAYLIST_PATH";


# Echo result
confirmation_message "[C] Playlist create: Playlist created."
echo ""