#! /usr/bin/env bash

set -e

# Wiki pages to update
wikiPageManual='Manual'
wikiPageDownloads='Downloads'

# Function to update a wiki page, if it has changed
function updatePage() {
	local pageName newContents mimeType
	local oldContents

	pageName="$1"
	newContents="$2"
	mimeType="$3"

	if [ -z "${mimeType}" ]; then
		mimeType='text/x-fossil-wiki'
	fi

	oldContents="$(fossil wiki export "${pageName}" 2>/dev/null)" || oldContents=''

	if [ "${oldContents}" != "${newContents}" ]; then
		echo "${newContents}" | fossil wiki commit --mimetype "${mimeType}" "${pageName}" >/dev/null 2>/dev/null || \
			echo "${newContents}" | fossil wiki create --mimetype "${mimeType}" "${pageName}" || return 1
	fi

	return 0
}

# Generate the new downloads page
function generateDownloads() {
	local version tarball sha256 manualPDF

	version="$1"
	tarball="$2"
	sha256="$3"
	manualPDF="$4"

	if [ -z "${version}" -o -z "${tarball}" ]; then
		return 0
	fi

	echo 'Tcl Nano'
	echo '========'
	echo ''
	echo "Current release: **${version}**"
	echo ''
	echo "  - [Manual](/uv/${manualPDF})"
	echo '  - Downloads:'
	echo "    - [Source](/uv/${tarball}) <small>(SHA2-256: ${sha256})</small>"
	echo ''
	echo "Older releases may be found in the [archives](/uvlist)."

	return 0
}

# Determine if a Fossil UV file exists
function fossilUVExists() {
	local file

	file="$1"

	if fossil uv cat "${file}" 2>/dev/null | grep '^' >/dev/null; then
		return 0
	fi

	return 1
}

# Ensure we are operating in the root of the checkout
cd "$(dirname "${BASH_SOURCE[0]}")/.."

# Update the repository
fossil sync
fossil uv sync

# Determine latest release
tclNanoReleaseVersion="$(fossil uv ls | sed 's/^releases\/tcl-nano-\(.*\)\.tar\.gz/\1/;t;d' | sort --version-sort | tail -n 1)"
tclNanoReleaseManualPDF="manuals/tcl-nano-${tclNanoReleaseVersion}.pdf"
tclNanoReleaseTarball="releases/tcl-nano-${tclNanoReleaseVersion}.tar.gz"
tclNanoReleaseDate="$(fossil uv cat "${tclNanoReleaseTarball}" 2>/dev/null | gzip -dc 2>/dev/null | tar -tvf - 2>/dev/null | awk '{ print $4 }')"
tclNanoReleaseTarballSHA256="$(fossil uv cat "${tclNanoReleaseTarball}" 2>/dev/null | openssl dgst -sha256 | sed 's/.*= *//')"

# Determine current development version
tclNanoDevelopmentVersion="$(awk '/^AC_INIT\(/{ sub(/^AC_INIT\([^,]*, */, ""); sub(/[,\)].*$/, ""); print; }' < configure.ac)"
tclNanoDevelopmentDate="$(date +%d-%b-%Y)"

# Generate the new manual page entry for the development version
developmentManPage="$(
	sed "s/@@VERS@@/${tclNanoDevelopmentVersion}/g;s/@@SHORT_DATE@@/${tclNanoDevelopmentDate}/g" nano.man | \
	/home/rkeene/devel/tcl-nano/build/work/pkgs/mandoc-1.14.2/INST/bin/mandoc -Thtml -Ofragment | \
	sed 's/<div[^>]*>&#x00A0;<\/div>//g;s@\[@\&#91;@g;s@\]@\&#93;@g'
)"
updatePage "${wikiPageManual}" "${developmentManPage}"

# Generate a PDF manual page for the release version, if it does not already exist
if ! fossilUVExists "${tclNanoReleaseManualPDF}"; then
	tclNanoReleaseManualPDFTmp="$(mktemp -u)"
	fossil uv cat "${tclNanoReleaseTarball}" 2>/dev/null | gzip -dc 2>/dev/null | tar --wildcards -xOf - '*/nano.man' | groff -mandoc -Tpdf > "${tclNanoReleaseManualPDFTmp}"
	fossil uv add "${tclNanoReleaseManualPDFTmp}" --as "${tclNanoReleaseManualPDF}"
	rm -f "${tclNanoReleaseManualPDFTmp}"
fi

# Generate the new download page entry
downloadsPage="$(generateDownloads "${tclNanoReleaseVersion}" "${tclNanoReleaseTarball}" "${tclNanoReleaseTarballSHA256}" "${tclNanoReleaseManualPDF}")"
updatePage "${wikiPageDownloads}" "${downloadsPage}" 'markdown'

# Push changes if any have been made
fossil sync
fossil uv sync

exit 0
