# shellcheck shell=bash
# shellcheck disable=SC2034 # Expected behavior for themes.
# shellcheck source-path=SCRIPTDIR/../powerline
source "${BASH_IT?}/themes/powerline/powerline.base.bash"

function __powerline_last_status_prompt {
	[[ "$1" -ne 0 ]] && echo "$(set_color ${LAST_STATUS_THEME_PROMPT_COLOR} -) ${1} ${normal}"
}

function __powerline_right_segment {
	local OLD_IFS="${IFS}"
	IFS="|"
	local params=($1)
	IFS="${OLD_IFS}"
	local padding=0
	local pad_before_segment=" "

	if [[ "${SEGMENTS_AT_RIGHT}" -eq 0 ]]; then
		if [[ "${POWERLINE_COMPACT_AFTER_LAST_SEGMENT}" -ne 0 ]]; then
			pad_before_segment=""
		fi
		RIGHT_PROMPT+="$(set_color ${params[1]} -)${POWERLINE_RIGHT_END}${normal}"
		((padding += 1))
	else
		if [[ "${POWERLINE_COMPACT_BEFORE_SEPARATOR}" -ne 0 ]]; then
			pad_before_segment=""
		fi
		# Since the previous segment wasn't the last segment, add padding, if needed
		#
		if [[ "${POWERLINE_COMPACT_AFTER_SEPARATOR}" -eq 0 ]]; then
			RIGHT_PROMPT+="$(set_color - ${LAST_SEGMENT_COLOR}) ${normal}"
			((padding += 1))
		fi
		if [[ "${LAST_SEGMENT_COLOR}" -eq "${params[1]}" ]]; then
			RIGHT_PROMPT+="$(set_color - ${LAST_SEGMENT_COLOR})${POWERLINE_RIGHT_SEPARATOR_SOFT}${normal}"
		else
			RIGHT_PROMPT+="$(set_color ${params[1]} ${LAST_SEGMENT_COLOR})${POWERLINE_RIGHT_SEPARATOR}${normal}"
		fi
		((padding += 1))
	fi

	RIGHT_PROMPT+="$(set_color - ${params[1]})${pad_before_segment}${params[0]}${normal}"

	((padding += ${#pad_before_segment}))
	((padding += ${#params[0]}))

	((RIGHT_PROMPT_LENGTH += padding))
	LAST_SEGMENT_COLOR="${params[1]}"
	((SEGMENTS_AT_RIGHT += 1))
}

function __powerline_right_first_segment_padding {
	RIGHT_PROMPT+="$(set_color - ${LAST_SEGMENT_COLOR}) ${normal}"
	((RIGHT_PROMPT_LENGTH += 1))
}

function __powerline_prompt_command {
	local last_status="$?" ## always the first
	local move_cursor_rightmost='\033[500C'

	LEFT_PROMPT=""
	RIGHT_PROMPT=""
	RIGHT_PROMPT_LENGTH=${POWERLINE_PADDING}
	SEGMENTS_AT_LEFT=0
	SEGMENTS_AT_RIGHT=0
	LAST_SEGMENT_COLOR=""

	_save-and-reload-history "${HISTORY_AUTOSAVE:-0}"

	## left prompt ##
	for segment in $POWERLINE_LEFT_PROMPT; do
		local info="$(__powerline_${segment}_prompt)"
		[[ -n "${info}" ]] && __powerline_left_segment "${info}"
	done

	if [[ -n "${LEFT_PROMPT}" ]] && [[ "${POWERLINE_COMPACT_AFTER_LAST_SEGMENT}" -eq 0 ]]; then
		__powerline_left_last_segment_padding
	fi

	[[ -n "${LEFT_PROMPT}" ]] && LEFT_PROMPT+="$(set_color ${LAST_SEGMENT_COLOR} -)${POWERLINE_LEFT_END}${normal}"

	## right prompt ##
	if [[ -n "${POWERLINE_RIGHT_PROMPT}" ]]; then
		# LEFT_PROMPT+="${move_cursor_rightmost}"
		for segment in $POWERLINE_RIGHT_PROMPT; do
			local info="$(__powerline_${segment}_prompt)"
			[[ -n "${info}" ]] && __powerline_right_segment "${info}"
		done

		if [[ -n "${RIGHT_PROMPT}" ]] && [[ "${POWERLINE_COMPACT_BEFORE_FIRST_SEGMENT}" -eq 0 ]]; then
			__powerline_right_first_segment_padding
		fi

		RIGHT_PAD=$(printf "%.s " $(seq 1 $RIGHT_PROMPT_LENGTH))
		LEFT_PROMPT+="${RIGHT_PAD}${move_cursor_rightmost}"
		LEFT_PROMPT+="\033[$((${#RIGHT_PAD} - 1))D"
	fi

	local prompt="${PROMPT_CHAR}"
	if [[ "${POWERLINE_COMPACT_PROMPT}" -eq 0 ]]; then
		prompt+=" "
	fi

	PS1="${LEFT_PROMPT}${RIGHT_PROMPT}\n$(__powerline_last_status_prompt ${last_status})${prompt}"

	## cleanup ##
	unset LAST_SEGMENT_COLOR \
		LEFT_PROMPT RIGHT_PROMPT RIGHT_PROMPT_LENGTH \
		SEGMENTS_AT_LEFT SEGMENTS_AT_RIGHT
}