#!/bin/bash
# MAIN: PLAYLIST VIEW
# Displays Playlist, with details such as time and commented out tracks


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


# Arrays Declarations
MASTER_USABLE_FILE_CONTENTS_ARRAY=()


# FUNCTION: Sum Times
function sum_times {


	# Receive parmeters
	INBOUND_ARRAY_FOR_SUMMING=("$@")

	# Get array length
	INBOUND_ARRAY_FOR_SUMMING_LENGTH=${#INBOUND_ARRAY_FOR_SUMMING[@]}


	# Sum - Centiseconds in array

		for ((i=0; i<INBOUND_ARRAY_FOR_SUMMING_LENGTH; i++)); 
		do 
			# ECHOVAR=$((i+1));
			TIMECS=${INBOUND_ARRAY_FOR_SUMMING[${i}]};
			TIMECS=${TIMECS:9};
			if [[ ${TIMECS:0:1} == "0" ]] ; then TIMECS="${TIMECS:1}"; fi # If time has leading zero, remove to prevent token fault
			# echo $TIMECS # Debug
			TOTAL_ARRAY_TIME_CS=$((TOTAL_ARRAY_TIME_CS+TIMECS));
		done
		# echo "Total Time in MS: ${TOTAL_ARRAY_TIME_MS}" # DEBUG


	# Sum - Seconds only in array

		for ((i=0; i<INBOUND_ARRAY_FOR_SUMMING_LENGTH; i++)); 
		do 
			# ECHOVAR=$((i+1));
			TIMES=${INBOUND_ARRAY_FOR_SUMMING[${i}]};
			TIMES=${TIMES:6};
			TIMES=${TIMES::-3};
			if [[ ${TIMES:0:1} == "0" ]] ; then TIMES="${TIMES:1}"; fi # If time has leading zero, remove to prevent token fault
			# echo $TIMES # Debug
			TOTAL_ARRAY_TIME_S=$((TOTAL_ARRAY_TIME_S+TIMES));
		done
		# echo "Total Time in S: ${TOTAL_ARRAY_TIME_S}" # DEBUG


	# Sum - Minutes only in array

		for ((i=0; i<INBOUND_ARRAY_FOR_SUMMING_LENGTH; i++)); 
		do 
			# ECHOVAR=$((i+1));
			TIMEM=${INBOUND_ARRAY_FOR_SUMMING[${i}]};
			TIMEM=${TIMEM:3};
			TIMEM=${TIMEM::-6};
			if [[ ${TIMEM:0:1} == "0" ]] ; then TIMEM="${TIMEM:1}"; fi # If time has leading zero, remove to prevent token fault
			# echo $TIMEM # Debug
			TOTAL_ARRAY_TIME_M=$((TOTAL_ARRAY_TIME_M+TIMEM));
		done
		# echo "Total Time in M: ${TOTAL_ARRAY_TIME_M}" # DEBUG


	# Sum - Hours only in array

		for ((i=0; i<INBOUND_ARRAY_FOR_SUMMING_LENGTH; i++)); 
		do 
			# ECHOVAR=$((i+1));
			TIMEH=${INBOUND_ARRAY_FOR_SUMMING[${i}]};
			TIMEH=${TIMEH:0};
			TIMEH=${TIMEH::-9};
			if [[ ${TIMEH:0:1} == "0" ]] ; then TIMEH="${TIMEH:1}"; fi # If time has leading zero, remove to prevent token fault
			# echo $TIMEH # Debug
			TOTAL_ARRAY_TIME_H=$((TOTAL_ARRAY_TIME_H+TIMEH));
		done
		# echo "Total Time in H: ${TOTAL_ARRAY_TIME_H}" # DEBUG


	# Assign intermediary variables the totals for further processing

		TEMPTOTAL_CS=${TOTAL_ARRAY_TIME_CS}
		TEMPTOTAL_S=${TOTAL_ARRAY_TIME_S}
		TEMPTOTAL_M=${TOTAL_ARRAY_TIME_M}
		TEMPTOTAL_H=${TOTAL_ARRAY_TIME_H}


	# Calculation of modolo values to assmenble friendly time:

		# Milliseconds - modolo and carryover calculation

			TT_CS_MOD=$((TEMPTOTAL_CS%100));
			TT_CS_DIV=$((TEMPTOTAL_CS/100));
			TT_CS_DIV=${TT_CS_DIV%.*} # Get rid of decimal
			# echo "ms - "${TEMPTOTAL_MS} "(modolo of:" ${TT_CS_MOD}"), and div of: "${TT_CS_DIV}; #DEBUG
			FRIENDLY_CS=${TT_CS_MOD};
			TEMPTOTAL_S=$((TEMPTOTAL_S + TT_CS_DIV));

		# Seconds - modolo and carryover calculation

			TT_S_MOD=$((TEMPTOTAL_S%60));
			TT_S_DIV=$((TEMPTOTAL_S/60));
			TT_S_DIV=${TT_S_DIV%.*}; # Get rid of decimal
			# echo "s  - "${TEMPTOTAL_S} "(modolo of:" ${TT_S_MOD}"), and a div of: "${TT_S_DIV}; #DEBUG
			FRIENDLY_S=${TT_S_MOD};
			TEMPTOTAL_M=$((TEMPTOTAL_M + TT_S_DIV));

		# Minutes - modolo and carryover calculation

			TT_M_MOD=$((TEMPTOTAL_M%60));
			TT_M_DIV=$((TEMPTOTAL_M/60));
			TT_M_DIV=${TT_M_DIV%.*}; # Get rid of decimal
			# echo "m  - "${TEMPTOTAL_M} "(modolo of:" ${TT_M_MOD}"), and a div of: "${TT_M_DIV}; #DEBUG
			FRIENDLY_M=${TT_M_MOD};
			TEMPTOTAL_H=$((TEMPTOTAL_H + TT_M_DIV));

		# Hours - modolo (no carryover, because days are not calculated)

			TT_H_MOD=$((TEMPTOTAL_H%24));
			TT_H_DIV=$((TEMPTOTAL_H/24));
			TT_H_DIV=${TT_H_DIV%.*}; # Get rid of decimal
			# echo "h  - "${TEMPTOTAL_H} "(modolo of:" ${TT_H_MOD}"), and a div of: "${TT_H_DIV}; #DEBUG
			FRIENDLY_H=${TEMPTOTAL_H};


	# Display Friendly Time:
	SUM_FUNCTION_RETURN="${FRIENDLY_H}h ${FRIENDLY_M}m ${FRIENDLY_S}.${FRIENDLY_CS}s"
	echo "$SUM_FUNCTION_RETURN"
	
	# Unset Variables
	FRIENDLY_H=""
	FRIENDLY_M=""
	FRIENDLY_S=""
	FRIENDLY_CS=""
	TOTAL_ARRAY_TIME_MS=""
	TOTAL_ARRAY_TIME_S=""
	TOTAL_ARRAY_TIME_M=""
	TOTAL_ARRAY_TIME_H=""
	SUM_FUNCTION_RETURN=""

}

function get_ffprobe_time {


	# Capture value pass
	TIME_CHECK_INPUT=$1

	# Use ffprobe and various text stream actions to pull time value
	FF_OUTPUT=$(ffprobe "$TIME_CHECK_INPUT" 2>&1 | grep "Duration");
	FF_OUTPUT=${FF_OUTPUT:12};
	FF_OUTPUT=${FF_OUTPUT::-36};
	
	# Return value
	echo $FF_OUTPUT;


}


function calculate_playlist_time {


	# Instsantiate Array
	MASTER_USABLE_FILE_CONTENTS_ARRAY=()

	# Read playlist file contents
	while IFS= read -r PLAYLIST_FILE_LINE
	do

		# Remove leading spaces
		PLAYLIST_LINE_NO_LEADING_SPACES=$(echo -e "${PLAYLIST_FILE_LINE}" | sed -e 's/^[[:space:]]*//')

		# If file line is not empty and ends in .mp3
		if [[ "$PLAYLIST_LINE_NO_LEADING_SPACES" != "" && $PLAYLIST_LINE_NO_LEADING_SPACES == *.mp3 ]]; then


			# Add file to master file contents array, get length
			MASTER_USABLE_FILE_CONTENTS_ARRAY+=("$PLAYLIST_LINE_NO_LEADING_SPACES")
			
			# Master usable array length
			MASTER_USABLE_ARRAY_LENGTH=${#MASTER_USABLE_FILE_CONTENTS_ARRAY[@]}


		fi

	done < "$PLAYLIST_PATH"


	# Create arrays for both commented and non commented lines
	ARRAY_OF_QUEUED_TIMES=()
	ARRAY_OF_ALL_TIMES=()
	
	for LINE_FOR_HASH_CHECK in "${MASTER_USABLE_FILE_CONTENTS_ARRAY[@]}"; do


		# If first character beings with hash
		if [[ ${LINE_FOR_HASH_CHECK:0:1} = "#" ]]; then

			
			# Remove Hash
			# LINE_FOR_HASH_CHECK=$(echo $LINE_FOR_HASH_CHECK | sed -e "s/\#//")
			LINE_FOR_HASH_CHECK=$(echo -e "${LINE_FOR_HASH_CHECK}" | sed -e 's/^[#| ]*//')
			LINE_FOR_HASH_CHECK=$(echo -e "${LINE_FOR_HASH_CHECK}" | sed -e 's/^[[:space:]]*//')

			# Run get_ffprobe_time for value
			FF_PROBE_RESULT=$(get_ffprobe_time "${LINE_FOR_HASH_CHECK}")

			# Add to arrays (both, in this case)			
			ARRAY_OF_ALL_TIMES=( "${ARRAY_OF_ALL_TIMES[@]}" "$FF_PROBE_RESULT" )


		# Else if line doesn't start with hash
		else


			# Run get_ffprobe_time for value
			FF_PROBE_RESULT=$(get_ffprobe_time "${LINE_FOR_HASH_CHECK}")

			# # Add to all array only
			ARRAY_OF_QUEUED_TIMES=( "${ARRAY_OF_QUEUED_TIMES[@]}" "$FF_PROBE_RESULT" )
			ARRAY_OF_ALL_TIMES=( "${ARRAY_OF_ALL_TIMES[@]}" "$FF_PROBE_RESULT" )


		fi


	done


	# Render Results
	printf "${COLOR_GREEN}[V] Playlist view:${COLOR_DEFAULT}\n";
	echo ""
	echo ""
	echo "   ${FONT_BOLD}PLAYLIST FILES (HH:MM:SS.MS)${FONT_DEFAULT}"
	echo ""

	# Numbmering Indexes (the printable ones)
	FRIENDLY_INDEX=1;
	COMPLETE_INDEX=1;

	# Create Array
	ARRAY_OF_QUEUED_TRACKS=()

	for (( i = 0; i < $MASTER_USABLE_ARRAY_LENGTH; i++ )); do


		# Prepare Filename to Echo
		FILENAME_TO_ECHO=${MASTER_USABLE_FILE_CONTENTS_ARRAY[$i]}
		FILENAME_TO_ECHO=$(sed -e s/"^.*queued\/"// <<< ${FILENAME_TO_ECHO})

		# check if line begins with #
		if [[ ${MASTER_USABLE_FILE_CONTENTS_ARRAY[$i]:0:1} == "#" ]]; then

			if [[ ${MASTER_USABLE_FILE_CONTENTS_ARRAY[$i]:0:1} == "#" ]]; then

				# Prepare "printable complete index"
				if [[ ${#COMPLETE_INDEX} = 1 ]]; then
					printf "          ${COLOR_GRAY}[0$COMPLETE_INDEX]    ${ARRAY_OF_ALL_TIMES[$i]} – # ${FILENAME_TO_ECHO}${COLOR_DEFAULT}\n"
				else
					printf "          ${COLOR_GRAY}[$COMPLETE_INDEX]    ${ARRAY_OF_ALL_TIMES[$i]} – # ${FILENAME_TO_ECHO}${COLOR_DEFAULT}\n"
				fi

			fi

		# Else if line doesn't start with #
		else

			# If does not start with #
			if [[ ${#FRIENDLY_INDEX} = 1 ]]; then
				printf "   0$FRIENDLY_INDEX"
			else
				printf "   $FRIENDLY_INDEX"
			fi
			FRIENDLY_INDEX=$((FRIENDLY_INDEX+1))

			# Prepare "printable complete index" (later gets indexed outside loop)
			if [[ ${#COMPLETE_INDEX} = 1 ]]; then
				printf "  $SYMBOL_RAQUO  [0$COMPLETE_INDEX]   "
			else
				printf "  $SYMBOL_RAQUO  [$COMPLETE_INDEX]   "
			fi

			# Echo Time
			echo -e " ${ARRAY_OF_ALL_TIMES[$i]} – ${FILENAME_TO_ECHO}"


		fi

		# Index "complete index"
		COMPLETE_INDEX=$((COMPLETE_INDEX+1))

	done


	# Deincrement friendly index, because increment happens in loop after it's printed
	FRIENDLY_INDEX=$(("$FRIENDLY_INDEX-1"))	# Get final count of queued times
	FINAL_COUNT_OF_QUEUED_ITEMS=${#ARRAY_OF_QUEUED_TIMES[@]}

	# Unsetariables and get sum of time arrays (for all files and queued files)
	SUM_OF_QUEUED_TIMES=""
	# SUM_OF_NT_OF_ALL_ITEMS=${#ARRAY_OF_ALL_TIMES[@]}ALL_TIMES=""
	SUM_OF_QUEUED_TIMES=$(sum_times "${ARRAY_OF_QUEUED_TIMES[@]}")
	SUM_OF_ALL_TIMES=$(sum_times "${ARRAY_OF_ALL_TIMES[@]}")

	# Echo Output
	echo -e ""
	echo -e "   ${FONT_BOLD}Total (${FINAL_COUNT_OF_QUEUED_ITEMS}/${MASTER_USABLE_ARRAY_LENGTH} tracks):  $SUM_OF_QUEUED_TIMES  /  $SUM_OF_ALL_TIMES${FONT_DEFAULT}\n"
	echo -e ""
	echo -e ""
	echo -e ""


}

function verify_playlist_integrity() {


	# Clear Array
	INTEGRITY_CHECK_FILE_LINES_ARRAY=()

	# Declare integrity check flag
	INTEGRITY_CHECK_FLAG="true"

	# Read playlist file contents
	while IFS= read -r PLAYLIST_FILE_LINE
	do

		# Remove leading spaces
		PLAYLIST_LINE_WITH_NO_LEADING_SPACES=$(echo -e "${PLAYLIST_FILE_LINE}" | sed -e 's/^[[:space:]]*//')

		# If line isn't blank
		if [[ -n $PLAYLIST_LINE_WITH_NO_LEADING_SPACES ]];
		then 

			# If ends in .mp3
			if [[ "$PLAYLIST_LINE_WITH_NO_LEADING_SPACES" == *.mp3 ]]; then

				# remove pound
				PLAYLIST_LINE_WITH_NO_LEADING_POUND=$(echo -e "${PLAYLIST_LINE_WITH_NO_LEADING_SPACES}" | sed -e 's/^[#| ]*//')

				# Add file to master file contents array, get length
				INTEGRITY_CHECK_FILE_LINES_ARRAY+=("$PLAYLIST_LINE_WITH_NO_LEADING_POUND")
			
			fi

		# If line is blank (then don't add to array / continue)
		else

			continue

		fi

	done < "$PLAYLIST_PATH"

	# Check that a file exists for each playlist line
	for INTEGRITY_CHECK_ITEM in "${INTEGRITY_CHECK_FILE_LINES_ARRAY[@]}"
	do

		# If doesn't exist then throw notice
		if [[ ! -f "$INTEGRITY_CHECK_ITEM" ]];

			then
				
				# Flag as failed
				INTEGRITY_CHECK_FLAG="false"


		fi

	done
	echo $INTEGRITY_CHECK_FLAG


}


# If playlist file exists, then do routine
if test -f "$PLAYLIST_PATH";

	# Execute calcualte_playlist_time
	then

		MASTER_PLAYLIST_INTEGRITY_CHECK=$(verify_playlist_integrity)
		if [[ "$MASTER_PLAYLIST_INTEGRITY_CHECK" == "true" ]]; 
	
			# If playlist integrity check passed
			then
				echo "Calculating playlist time..."
				calculate_playlist_time

			# else error
			else
				error_message "[V] View playlist: playlist contains invalid refs. Please edit or recreate for summary."
				echo ""

		fi


	# else if playlist file doesn't exist
	else 
		error_message "[V] View playlist: playlist file not found. Run \"C\" to create.";
		echo ""

fi