#!/bin/bash
#
# SPDX-License-Identifier: GPL-2.0-only
#
# Called with $1 as the build directory
#             $2 as the path to yocto-docs
#             $3 as the path to bitbake
#
# Environment variables:
#   - buildtools_url as the path to buildtools script for the docs.
#                     Can be found here: https://autobuilder.yocto.io/pub/buildtools/
#   - docbookarchive_url as the path to old (pre 3.1.5 and Sphinx migration) docs tarball
#                     Can be found here: https://downloads.yoctoproject.org/mirror/docbook-mirror/docbook-archives-20201105.tar.xz
#   - PUBLISH (0/1) for whether the files should be rsync'ed to docs.yoctoproject.org

set -e
set -u
set -o pipefail
set -x

builddir=$(realpath "$1")
ypdocs=$(realpath "$2/documentation/")
bbdocs=$(realpath "$3/doc/")
outputdir=$builddir/output
scriptdir="$(dirname "$(readlink -f "${BASH_SOURCE[0]}")")"
PUBLISH=${PUBLISH:-1}
sharedir=`jq -r '.["BASE_SHAREDDIR"]' < $HOME/config-local.json`
buildtools_url=${buildtools_url:-https://downloads.yoctoproject.org/releases/yocto/yocto-4.1.2/buildtools/x86_64-buildtools-docs-nativesdk-standalone-4.1.2.sh}
docbookarchive_url=${docbookarchive_url:-https://downloads.yoctoproject.org/mirror/docbook-mirror/docbook-archives-20201105.tar.xz}

buildtools_name=`basename $buildtools_url`
buildtools_localpath=${sharedir}/cluster-downloads-cache/${buildtools_name}

if [ ! -e ${buildtools_localpath} ]; then
    mkdir -p `dirname ${buildtools_localpath}`
    wget ${buildtools_url} -O ${buildtools_localpath}
    chmod a+x ${buildtools_localpath}
fi

cd $builddir
mkdir buildtools
${buildtools_localpath} -y -d $builddir/buildtools
. $builddir/buildtools/environment-setup*

# To build the latexpdf output we need Xetex (which can handle international characters)
# Rather than require it on all autobuilder workers, along with dependencies, we install
# a copy onto NFS which the workers can use. The full install is 6GB so just install
# the pieces we've found we need via tlmgr on top of a small install. This script 
# creates the install if it isn't present.
# For local docs builds, we assume the user has the tools available.
if [ -e /srv/autobuilder/valkyrie.yocto.io/ ]; then
    textooldir=/srv/autobuilder/valkyrie.yocto.io/docs-build-tex-tools
    if [ ! -e ${textooldir} ]; then
        mkdir -p /tmp/textemp
        pushd /tmp/textemp
        wget https://mirror.ctan.org/systems/texlive/tlnet/install-tl-unx.tar.gz
        zcat < install-tl-unx.tar.gz | tar xf -
        cd install-tl-*/
        ./install-tl --scheme=small --texdir=${textooldir} --no-interaction
        PATH=$PATH:${textooldir}/bin/x86_64-linux tlmgr install titlesec varwidth tabulary needspace upquote framed capt-of wrapfig fncychap gnu-freefont ctex
        popd
    PATH=$PATH:${textooldir}/bin/x86_64-linux
fi

# Getting the old docbook built docs from an archive. Not rebuilding them.
docbookarchive_localpath=${sharedir}/cluster-downloads-cache/`basename ${docbookarchive_url}`
if [ ! -e ${docbookarchive_localpath} ]; then
    mkdir -p `dirname ${docbookarchive_localpath}`
    wget ${docbookarchive_url} -O ${docbookarchive_localpath}
fi

mkdir $outputdir
cd $outputdir
echo Extracing old content from archive
tar --exclude=eclipse -xJf ${docbookarchive_localpath}

$scriptdir/docs_add_banner.py

cd $bbdocs
mkdir $outputdir/bitbake

# A decision was made to keep updating all the Sphinx generated docs for the moment,
# even the ones corresponding to no longer supported releases
# https://lists.yoctoproject.org/g/docs/message/2193
# We copy the releases.rst file from master so that all versions of the docs
# see the latest releases.
first_sphinx_commit=84ccba0f4aff91528f764523fe1205a354c889ed

latest_branch=$(git branch --remote --contains "$first_sphinx_commit" --format '%(refname:lstrip=3)' --sort='-version:refname' | grep --max-count=1 "[0-9]*\.[0-9]*")

for branch in 1.46 $(git branch --remote --contains "$first_sphinx_commit" --format '%(refname:lstrip=3)'); do
    if [ "$branch" = "HEAD" ]; then
        continue
    fi

    echo Building bitbake $branch branch
    git checkout $branch
    git reset --hard
    git clean -ffdx
    git checkout origin/master releases.rst
    make clean
    SPHINXOPTS="-j auto" make publish

    if [ "$branch" = "master-next" ]; then
        branch="next"
	mkdir $outputdir/bitbake/$branch
    elif [ "$branch" = "master" ]; then
        branch="dev"
        mkdir $outputdir/bitbake/$branch
    elif [ "$branch" = "$latest_branch" ]; then
        branch=""
        mkdir $outputdir/bitbake/$latest_branch
        cp -r ./_build/final/* $outputdir/bitbake/$latest_branch
    else
	mkdir $outputdir/bitbake/$branch
    fi

    cp -r ./_build/final/* $outputdir/bitbake/$branch
    git reset --hard
    git clean -ffdx
done

if [ "$PUBLISH" -ne 0 ]; then
    # only sync bitbake folder for now. We need bitbake to be published first
    # since the bitbake intersphinx index will be downloaded to build yocto-docs
    cd $outputdir
    rsync -irlp --checksum --ignore-times --delete bitbake docs@docs.yoctoproject.org:docs/
fi

cd $ypdocs

# transition must build after master for the switchers.js file
# Again, keeping even the no longer supported releases (see above comment)
first_sphinx_commit=01dd5af7954e24552aca022917669b27bb0541ed
first_dunfell_sphinx_commit=c25fe058b88b893b0d146f3ed27320b47cdec236

ypdocsbranch=$(git symbolic-ref -q --short HEAD || git rev-parse HEAD)

git checkout origin/master set_versions.py
#latest_tag=$(git tag --contains "$first_sphinx_commit" --contains "$first_dunfell_sphinx_commit" --sort="version:refname" 'yocto-*' | tail -1 | sed 's/yocto-//')
latest_tag=$(./set_versions.py getlatest)
git reset --hard
git clean -ffdx

for branch in "$ypdocsbranch" dunfell $(git branch --remote --contains "$first_sphinx_commit" --format '%(refname:lstrip=3)') $(git tag --contains "$first_sphinx_commit" --contains "$first_dunfell_sphinx_commit" 'yocto-*') transition; do
    if [ "$branch" = "HEAD" ]; then
        continue
    fi

    # Do not build <release>-next branches as they are development branches only
    # Do build master-next branch and request branch though!
    if echo "$branch" | grep -v "master-next\|$ypdocsbranch" | grep -q -E "-next$"; then
        continue
    fi
    # Do not build contrib/ branches as they are development branches only
    # Do build request branch though!
    if echo "$branch" | grep -v "$ypdocsbranch" | grep -q -E "^contrib/"; then
        continue
    fi

    echo Building $branch
    git checkout $branch
    git reset --hard
    git clean -ffdx

    if [ -e "${scriptdir}/docs-build-patches/${branch}/" ]; then
        echo Adding patch for $branch
        git am "${scriptdir}/docs-build-patches/${branch}/"000*
    fi

    git checkout origin/master sphinx-static/switchers.js.in set_versions.py
    if [ -e poky.yaml ]; then
        cp poky.yaml poky.yaml.in
        case $branch in
            yocto-*)
                ./set_versions.py $(echo "$branch" | sed 's/yocto-//')
                ;;
            *)
                ./set_versions.py
                ;;
        esac
    fi

    make clean
    SPHINXOPTS="-j auto" make publish

    # Strip yocto- from tag names
    branch=$(echo "$branch" | sed 's/yocto-//')

    if [ "$branch" = "master-next" ]; then
        branch="next"
	mkdir -p $outputdir/$branch
    elif [ "$branch" = "master" ]; then
        branch="dev"
        mkdir -p $outputdir/$branch
    elif [ "$branch" = "$latest_tag" ]; then
        branch=""
        mkdir -p $outputdir/$latest_tag
        cp -r ./_build/final/* $outputdir/$latest_tag
        echo Linking to $latest_tag as current
        ln -s $latest_tag $outputdir/current
    elif [ "$branch" = "transition" ]; then
        branch=""
    else
	mkdir -p $outputdir/$branch
    fi

    cp -r ./_build/final/* $outputdir/$branch
    git reset --hard
    git clean -ffdx
done

# Update bitbake switchers.js with the copy from master ypdocs
cd $outputdir/bitbake
find . -name switchers.js -exec cp $outputdir/current/_static/switchers.js {} \;

if [ "$PUBLISH" -ne 0 ]; then
    cd $outputdir
    rsync -irlp --checksum --ignore-times --delete . docs@docs.yoctoproject.org:docs/
fi