#!/bin/bash
# 2024-03-06 Hyperling
# PanDoc Usage: https://pandoc.org/MANUAL.html#general-writer-options

## Setup ##

DIR="$(dirname -- "${BASH_SOURCE[0]}")"
DIR="`pwd`"
echo "$DIR"

date

## Global Variables ##

header="header.md"
work_dir="$DIR/build"
export_dir="$DIR/export"
ebook_prefix="TechnologyAlternatives"

## Functions ##

function log {
	echo -e "*** $1 ***"
}

# Start Log Section
function logs {
	echo -e "\n***** $1 *****"
}

# Finish Log Section
function logf {
	echo -e "***** $1 *****\n"
}

# Copy a file into another file.
function insert {
	input="$1"
	ebook="$2"
	log "Adding '$input' to '$ebook'."
	cat "$input" >> "$ebook"
}

# Compile all the snippets into one Markdown file.
function combine {
	ebook="$1.md"
	logs "Combining documents to create '$ebook'."
	shift
	for addition in "$@"; do
		insert "$addition" "$ebook"
	done
	logf "Done!"
}

# Create the PDF and booklets them move them back to the project directory.
function convert {
	source="$1"
	version="$2"

	out_dir="$export_dir"
	ebook="${source//.md/.pdf}"

	logs "Creating '$ebook' from '$source'."

	book="${ebook//.pdf/-book.pdf}"
	booklet="${ebook//.pdf/-Booklet.pdf}"
	rotated="${ebook//.pdf/-Rotated.pdf}"

	log "Set VERSION to '$version'."
	if [[ -z "$version" ]]; then
		log "Version is null, removing the extra space."
		space=" "
	else
		space=""
	fi
	sed -i "s/$space{VERSION}/$version/g" "$source"

	log "Compiling '$source' to '$ebook'."
	pandoc "$source" \
		-s -N --toc --toc-depth=4 \
		-o "$ebook" \
		>/dev/null
	status=$?

	log "Creating booklet of '$ebook'."
	pdfbook2 -n "$ebook" >/dev/null
	mv -v "$book" "$booklet"

	log "Creating rotated booklet of '$ebook'."
	pdfbook2 -ns "$ebook" >/dev/null
	mv -v "$book" "$rotated"

	log "Moving '$ebook' and its booklets to '$out_dir'."
	mkdir -p "$out_dir"
	mv -v *.pdf "$out_dir"/

	logf "Complete!"
}

## Cleanup ##

logs "Clean PDFs"
echo "Old:"
find "$DIR" -name "*".pdf -exec du -h {} \; -delete | sort -h

logs "Clean working directory '$work_dir'"
if [[ -e "$work_dir" ]]; then
	rm -rv "$work_dir"
fi

## Main ##

mkdir -pv "$work_dir"
cd "$work_dir"
cp -v "$DIR/$header" ./
sed -i "s/{REVISION_DATE}/`date +'%Y-%m-%d'`/g" "$header"

# Primary, All In One (AIO)
name="$ebook_prefix""_AllPlatforms"
combine "$name" "$header" `ls "$DIR"/content*.md`
convert "$name.md" ""

# Secondary, Mobile
name="$ebook_prefix""_MobileOnly"
combine "$name" "$header" "$DIR/content00"* "$DIR/content10"* \
	"$DIR/content70"* "$DIR/content90"*
convert "$name.md" "(Mobile Only)"

# Secondary, Desktop
name="$ebook_prefix""_DesktopOnly"
combine "$name" "$header" "$DIR/content00"* "$DIR/content20"* \
	"$DIR/content70"* "$DIR/content90"*
convert "$name.md" "(Desktop Only)"

# Secondary, Server
name="$ebook_prefix""_ServerOnly"
combine "$name" "$header" "$DIR/content00"* "$DIR/content30"* \
	"$DIR/content70"* "$DIR/content90"*
convert "$name.md" "(Server Only)"


## Finish! ##

cd "$DIR"

echo "New:"
find "$DIR" -name "*".pdf -exec du -h {} \; | sort -h

date

exit $status