#!/usr/bin/bash
#
# Update a plugin with new shipdriver templates.
#
# usage: ./update-templates [-t] [treeish]
#
# Merge changes from upstream shipdriver repo into
# current branch.
#
# See UPDATE-TEMPLATES.md for more info

function usage() {
    cat << EOT
Usage:
    update-templates [-T]  <treeish>
    update-templates [-h |-l]


Parameters:
    treeish:
         A shipdriver tag or branch.
    Recommended usage is using the latest stable (non-beta) tag

Options:
    -l   List available shipdriver tags
    -h   Print this message and exit
    -T   Test mode, do not auto-update

Examples:
    update-templates -l                   -- List available tags
    update-templates sd3.0.2              -- Update from sd3.0.2 tag
    update-templates shipdriver/v3.0      -- Update from v3.0 release branch
    update-templates shipdriver/master    -- Update from development branch
EOT
}

function list_sd_tags() {
    # List all tags in shipdriver remote with a 'sd' prefix
    git ls-remote --tags shipdriver \
        | sed  -n -e '/{}/d' -e 's|.*tags/||' -e '/^sd/p'
}

function init_shipdriver_remote() {
    # Set up the shipdriver remote
    if git ls-remote --exit-code shipdriver &>/dev/null; then
        git remote remove shipdriver
        echo "Removing existing shipdriver remote."
    fi
    echo "Adding new shipdriver remote"
    git remote add shipdriver https://github.com/Rasbats/shipdriver_pi.git
    # Fetch all available shipdriver sd* tags
    for t in $(list_sd_tags); do
        git fetch -q shipdriver refs/tags/$t:refs/tags/$t --no-tags
    done
}

function update_dir() {
    # Update directory $1 from shipdriver treeish $2
    local d=$1
    local treeish=$2

    echo "Updating $d"
    if [ -d $d ]; then git rm -rf $d/*; fi
    git checkout $treeish $d
    git add $d
    git diff-index --quiet --cached HEAD -- || {
        git commit -m "Templates: Updating $d"
    }
}


# Exec on tmpfile to avoid file lock when updating script on Windows.
# The directory /c exists on git bash on Windows, and hopefully only there.
if [[ -d /c && "$0" =~ .*update-templates ]]; then
    tmpfile=$(mktemp)
    cp $0 $tmpfile
    exec $tmpfile $@
fi

# Handle options and parameters
usage="Usage: $0 [-t] [-T] [treeish]"
merge_opt=""
while getopts "Thl" opt; do
    case "${opt}" in
        T)  test_mode=true
            ;;
        h)  usage; exit 0
            ;;
        l)  do_list_tags="true"
            ;;
        *)  usage >&2; exit 1
            ;;
    esac
done
shift $((OPTIND-1))

if [ -n "$do_list_tags" ]; then
    if [ -z "$test_mode" ]; then init_shipdriver_remote; fi
    list_sd_tags
    exit 0
fi

if [ -z "$1" ]; then
    usage >&2
    exit 1
fi

test -z "$test_mode" || set -x

source_treeish=$1

# Refuse to run unless the index is clean:
clean=$(git status --porcelain)
if [ -n "$clean" ]; then
    echo "Please commit or stash pending changes. Aborting."
    exit 1
fi

if [ -z "$test_mode" ]; then
    init_shipdriver_remote

    echo "Checking for updates of updates-templates script"
    if ! git diff --quiet HEAD $source_treeish -- update-templates; then
        git checkout $source_treeish update-templates
        cat << EOT
update-templates script is updated to latest version. Please commit
changes and re-run script.
EOT
        exit 0
    fi
fi

git rev-parse --verify -q $source_treeish || {
    echo "Unknown tag or branch $source_treeish -- giving up."
    exit 1
}

# Updating  standard directories
for dir in cmake ci scripts buildwin; do
    update_dir $dir $source_treeish
done

# If Plugin.cmake exists we should also update CMakeLists.txt
if [ -f Plugin.cmake ]; then CMakeLists=CMakeLists.txt; fi

echo "Templates: Updating other files"
for f in \
    appveyor.yml \
    Changelog.md \
    .circleci \
    .clang-format \
    .cmake-format.yaml \
    .drone.yml \
    .gitattributes \
    .gitignore \
    flatpak/manifest.wx31.patch \
    INSTALL.md \
    plugin.xml.in \
    .travis.yml \
    update-templates \
    UPDATE_TEMPLATES.md \
    $CMakeLists
do
    if test -d $f; then git rm -rf $f; fi
    git checkout $source_treeish $f
    git add $f || git add --renormalize $f
done
git commit -m "Templates: Updating other files"

# Handle opencpn-libs submodule
test -d opencpn-libs || \
    git submodule add https://github.com/leamas/opencpn-libs.git opencpn-libs
git submodule update --remote --merge opencpn-libs
git add opencpn-libs
git diff-index --quiet --cached HEAD -- || {
    echo "Updating opencpn-libs submodule"
    git commit -m "opencpn-libs: Update to latest version."
}


# Check for files/dirs which are private, but should be copied on first run.
for f in config.h.in build-deps libs; do
    if test -e $f; then continue; fi
    git checkout $source_treeish $f
done
git diff-index --quiet --cached HEAD -- || {
    echo "Adding initial versions of private data"
    git commit -m "Adding initial versions of private data"
}

if [ -e update-ignored ]; then
    echo "Revert changes in blacklisted files."
    for f in $(cat update-ignored); do
        git checkout HEAD $f
    done
fi

for f in buildosx buildwin/NSIS* libs/AndroidLibs.cmake mingw; do
    if test -e $f; then git rm -rf $f; fi
done
git diff-index --quiet --cached HEAD -- || {
    echo "Removing unused files"
    git commit -am "Templates: Removing obsoleted and unused files."
}

if [ -f cmake/TemplateVersion ]; then
    our_manifest=$(echo flatpak/org.opencpn.OpenCPN.Plugin.*.yaml)
    echo "Append shipdriver flatpak manifest's log of changes to $our_manifest"

    prev_commit=$(sed -n '/commit:/s/.*: *//p' cmake/TemplateVersion)
    src_manifest=flatpak/org.opencpn.OpenCPN.Plugin.shipdriver.yaml
    git checkout $source_treeish $src_manifest
    git diff  $prev_commit $src_manifest | sed 's/^/# /' \
        >> $our_manifest
    git rm -f $src_manifest
fi

echo "Create or update cmake/TemplateVersion"
echo "# Created by update-templates" > cmake/TemplateVersion
echo "date: $(date -u +'%Y-%m-%d %H:%M UTC')" >> cmake/TemplateVersion
commit=$(git rev-parse --short $source_treeish)
echo "commit: $commit" >> cmake/TemplateVersion
tags=$(git tag --contains $commit)
echo "tags: $tags" >> cmake/TemplateVersion
git add cmake/TemplateVersion
git commit -m "cmake: Update TemplateVersion to $commit"

cat << EOF


Shipdriver templates has been updated. Please review Changelog.md for info
about changes in last release.

See UPDATE_TEMPLATES.md for more info.
EOF