#!/bin/bash
# SYSTEM: UPDATE AUDIO FRAME SIZE
# Run debug then search log for instance of frame size. Assgn to variable then write to anonradio-config.json


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


# Kill process (as a safeguard)
sudo pkill "liquidsoap";


# Get active config name, construct path to streamable config file (for validation)
CURRENTLY_ACTIVE_CONFIG_NAME=$(<"$CONFIG_FILE_IDENTIFIER_PATH")
STREAMABLE_CONFIG_FILE_PATH="$CONFIG_DIRECTORY/config-$CURRENTLY_ACTIVE_CONFIG_NAME.json"


# Check if config file exists
if [[ -f "$STREAMABLE_CONFIG_FILE_PATH" ]]; 
	
	# If exists
	then

		# Set up timestamp formatting, path, then create file and set permission for coming log-dump
		TIMESTAMP_FILENAME="log-$(date +%s)"
		CURRENT_CHOWN_USER=$(whoami)
		FULL_LOG_FILE_PATH="$LOG_FOLDER_PATH/buffer_evaluation_$TIMESTAMP_FILENAME"
		sudo touch "$FULL_LOG_FILE_PATH"
		sudo chmod 755 "$FULL_LOG_FILE_PATH"
		sudo chown "$CURRENT_CHOWN_USER" "$FULL_LOG_FILE_PATH"


		# Log color formatting of log, then export log to specified log file (butter_evaluation_log-[timestamp])
		printf "${COLOR_GRAY}"; 
		liquidsoap -v --debug 'input.alsa(bufferize=false)' >> $FULL_LOG_FILE_PATH & sleep 3;
		sudo pkill "liquidsoap";
		sleep 2
		printf "${COLOR_DEFAULT}"


		# Notification of command edecution
		confirmation_message "[H] Review Hardware Audio Frame Size:"


		# sed to strip away just want 
		# Example log line (for reference): 
		# 2019/11/09 19:11:09 [frame:3] Frame size must be a multiple of 1764 ticks = 1764 audio samples = 1 video samples.
		BUFFER_RECOMMENDED=$(sed -e s/"^.*ticks = "// -e s/" audio samples.*$"// <<< $(sed -n "s/Frame size must be a multiple of//p" $FULL_LOG_FILE_PATH))
		BUFFER_DECLARED=$(sed -e s/'[ \t]*\"\"\:\"'// -e s/'".*'// <<< $(sed -n "s/"hardware_audio_frame_size"//p" $STREAMABLE_CONFIG_FILE_PATH))


		# Check if declared AFS buffer size is a multiple of recommended AFS buffer (using bc)
		# Then, if checked result has 8 decimal places of zeroes, then echo appropriate notice
		BUFFER_MULTIPLE_CHECK=`echo "scale=8; $BUFFER_DECLARED/$BUFFER_RECOMMENDED" | bc -l` 
		if [[ $BUFFER_MULTIPLE_CHECK == *".00000000"* ]]; then
			NOTICE="${COLOR_GREEN}${SYMBOL_CHECKMARK}${COLOR_DEFAULT} ${FONT_BOLD}Config settings OK! (config AFS is multiple of recommended AFS)${FONT_DEFAULT}"
		else
			NOTICE="${FONT_BOLD}${COLOR_YELLOW}${SYMBOL_HAZARD}${COLOR_DEFAULT} Warning: Config AFS is not a multiple of recommended AFS${FONT_DEFAULT}"
		fi


		# Output / Reporting:
		printf "\n"
		printf "\n"
		printf "${FONT_BOLD}   HARDWARE, AUDIO FRAME SIZE (AFS):${FONT_DEFAULT}\n"
		printf "\n"
		# printf "   • Default system frame size           - $BUFFER_OBSERVED\n"
		printf "   • Recommended frame size              - $BUFFER_RECOMMENDED\n"
		printf "   • Your current config's frame size    - $BUFFER_DECLARED\n"
		printf "\n"
		printf "   $NOTICE\n"
		printf "\n"
		printf "\n"
		printf "\n"


		# Unset Variables
		IDENTIFYING_STRING=""
		BUFFER_LINE=""
		EVALUATED_SAMPLES=""
		BUFFER_OBSERVED=""
		NOTICE=""

    # If no config file exists    
	else	
		error_message "[H] Review Hardware Audio Frame Size: No config file to reference. Please specify."
		echo ""

fi