#!/bin/bash
set -euo pipefail

ROOT="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
cd "$ROOT"

if [[ $# -eq 1 ]]; then
    version="$1"

    package_name="ekklesia-classroom_${version}_amd64.deb"
    package_path="$ROOT/repo/packages/$package_name"

    if [[ ! -f "$package_path" ]]; then
        echo "Package does not exist locally:"
        echo "$package_path"
        exit 1
    fi

    hash="$(sha256sum "$package_path" | awk '{print $1}')"

    mkdir -p "$ROOT/repo/stable"

    cat > "$ROOT/repo/stable/manifest.json" <<EOF
{
  "version": "$version",
  "package": "/packages/$package_name",
  "sha256": "$hash",
  "requires_reboot": true
}
EOF
else
    if [[ ! -f "$ROOT/repo/canary/manifest.json" ]]; then
        echo "No local canary manifest exists."
        exit 1
    fi

    mkdir -p "$ROOT/repo/stable"
    cp "$ROOT/repo/canary/manifest.json" "$ROOT/repo/stable/manifest.json"

    version="$(python3 -c \
        'import json; print(json.load(open("repo/stable/manifest.json"))["version"])')"
fi

echo "Promoting $version to STABLE"

rsync -av \
    -e ssh \
    "$ROOT/repo/stable/manifest.json" \
    classroom-control:/srv/ekklesia/classroom-updates/stable/manifest.json


package_name="ekklesia-classroom_${version}_amd64.deb"

# THE PERMANENT URL.
#
# .../stable/latest.deb is a symlink beside the manifest pointing at the
# versioned package the manifest names, so there is one download address
# that never changes and still no second place recording which version is
# current. The manifest remains the only answer to that question.
#
# It is swapped AFTER the manifest, and by rename, for two reasons. A
# rename is atomic, so nothing ever downloads a half-written pointer; and
# going last means latest.deb can only ever lag the manifest by a moment,
# never lead it — it can never offer a package the channel has not
# published. The versioned file itself is never touched again once
# uploaded.
ssh classroom-control "
    set -e
    cd /srv/ekklesia/classroom-updates/stable
    test -f ../packages/$package_name
    ln -sfn ../packages/$package_name latest.deb.new
    mv -Tf latest.deb.new latest.deb
"

echo "https://updates.riverofglorymn.org/stable/latest.deb -> $package_name"

echo
echo "Ekklesia Classroom $version is now STABLE"
echo "https://updates.riverofglorymn.org/stable/manifest.json"