#!/bin/bash
set -e  # Exit on error

# Resolve the target version from an explicit override first, then from the
# latest published GitHub release. The dl.gitea.com version JSON can lag
# behind actual releases, so it is only used as a fallback.
resolve_version() {
    local version=""

    if [[ -n "${1:-}" ]]; then
        VERSION_SOURCE="command line argument"
        echo "$1"
        return 0
    fi

    if [[ -n "${GITEA_VERSION:-}" ]]; then
        VERSION_SOURCE="GITEA_VERSION environment variable"
        echo "${GITEA_VERSION}"
        return 0
    fi

    if version=$(curl -fsSL https://api.github.com/repos/go-gitea/gitea/releases/latest 2>/dev/null | jq -r '.tag_name // empty' 2>/dev/null); then
        version="${version#v}"
        if [[ "$version" =~ ^[0-9]+\.[0-9]+\.[0-9]+$ ]]; then
            VERSION_SOURCE="GitHub releases API"
            echo "$version"
            return 0
        fi
    fi

    if version=$(curl -fsSL https://dl.gitea.com/gitea/version.json 2>/dev/null | jq -r '.latest.version // empty' 2>/dev/null); then
        if [[ "$version" =~ ^[0-9]+\.[0-9]+\.[0-9]+$ ]]; then
            VERSION_SOURCE="dl.gitea.com version.json fallback"
            echo "$version"
            return 0
        fi
    fi

    echo "❌ Unable to determine the latest Gitea version. Set GITEA_VERSION or pass a version as the first argument." >&2
    exit 1
}

VERSION=$(resolve_version "${1:-}")
DOWNLOAD_BASE_URL="${GITEA_DOWNLOAD_BASE_URL:-https://github.com/go-gitea/gitea/releases/download/v${VERSION}}"
BUILD_ROOT="build/${VERSION}"

echo "Current version: ${VERSION}"
echo "Version source: ${VERSION_SOURCE}"
# Check if this version is already built
if [[ -f "../gitea-deb/gitea_${VERSION}_amd64.deb" ]] && [[ -f "../gitea-deb/gitea_${VERSION}_arm64.deb" ]]; then
    echo "✅ Version ${VERSION} already built and present in release repo. Aborting."
    exit 0
fi

ARCHS=("amd64" "arm64")
FILES=("xz" "xz.asc" "xz.sha256" "xz.sha256.asc")

# Download Gitea Binaries and Signatures
for ARCH in "${ARCHS[@]}"; do
	echo "Downloading Gitea ${VERSION} for ${ARCH} …"
	if [[ ! -d "dist/${ARCH}" ]]; then
        echo "Creating directory dist/${ARCH}"
        mkdir "dist/${ARCH}"
    fi
	for FILE in "${FILES[@]}"; do
		FILE_NAME="gitea-${VERSION}-linux-${ARCH}.${FILE}"
		FILE_URL="${DOWNLOAD_BASE_URL}/${FILE_NAME}"
		TARGET_FILE="dist/${ARCH}/${FILE_NAME}"
        if [[ -f "$TARGET_FILE" ]]; then
            echo "✅ File already exists: $TARGET_FILE (Skipping)"
        else
            echo "⬇️  Downloading: $FILE_URL"
            wget -q "$FILE_URL" -O "$TARGET_FILE"
        fi
	done
done

# Verify GPG Signatures
for ARCH in "${ARCHS[@]}"; do
	echo "Verifying GPG signature for ${ARCH} …"
	gpg --verify "dist/${ARCH}/gitea-${VERSION}-linux-${ARCH}.xz.asc" "dist/${ARCH}/gitea-${VERSION}-linux-${ARCH}.xz"
	gpg --verify "dist/${ARCH}/gitea-${VERSION}-linux-${ARCH}.xz.sha256.asc" "dist/${ARCH}/gitea-${VERSION}-linux-${ARCH}.xz.sha256"
done


#  Verify Checksums
for ARCH in "${ARCHS[@]}"; do
	echo "Verifying SHA256 checksum for ${ARCH} …"
	(cd "dist/${ARCH}" && sha256sum -c gitea-${VERSION}-linux-${ARCH}.xz.sha256)
done

# Stage package contents in a disposable build directory so the repository's
# tracked packaging files do not get modified during a build.
for ARCH in "${ARCHS[@]}"; do
    PACKAGE_DIR="${BUILD_ROOT}/${ARCH}"

    if [[ ! -d "${PACKAGE_DIR}" ]]; then
        echo "Creating staging directory ${PACKAGE_DIR}"
        mkdir -p "${PACKAGE_DIR}"
    fi

    cp -a "${ARCH}/." "${PACKAGE_DIR}/"

    if [[ ! -d "${PACKAGE_DIR}/opt/gitea/bin" ]]; then
        echo "Creating directory ${PACKAGE_DIR}/opt/gitea/bin"
        mkdir -p "${PACKAGE_DIR}/opt/gitea/bin"
    fi

	xz -dc "dist/${ARCH}/gitea-${VERSION}-linux-${ARCH}.xz" > "${PACKAGE_DIR}/opt/gitea/bin/gitea" || { echo "❌ Extraction failed for ${ARCH}"; exit 1; }

	# Verify the extracted file isn't empty
	if [[ ! -s "${PACKAGE_DIR}/opt/gitea/bin/gitea" ]]; then
		echo "❌ Extracted file is empty for ${ARCH}. Something went wrong!"
		exit 1
	fi
	chmod +x "${PACKAGE_DIR}/opt/gitea/bin/gitea"
done
	
# Build Debian Packages
for ARCH in "${ARCHS[@]}"; do
    echo "Building package for ${ARCH} …"
    PACKAGE_DIR="${BUILD_ROOT}/${ARCH}"
    sed -i "s/^Version: .*/Version: ${VERSION}/" "${PACKAGE_DIR}/DEBIAN/control"
    dpkg-deb --build "${PACKAGE_DIR}" "gitea_${VERSION}_${ARCH}.deb"
done

echo "All packages built successfully:"
ls -lh gitea_${VERSION}_*.deb

echo "Moving .deb packages to release repo …"
mv gitea_${VERSION}_*.deb ../gitea-deb/

(
    cd ../gitea-deb

    echo "Updating APT package index …"
    dpkg-scanpackages --multiversion . override > Packages
    dpkg-scanpackages --multiversion . override | gzip -9c > Packages.gz

    echo "Generating Release file …"
    apt-ftparchive -c=apt-release.conf release . > Release

    git add --all .
    if ! git diff --cached --quiet; then
        echo "Committing and pushing release …"
        git commit -m "Release Gitea ${VERSION}"
        git push
    else
        echo "No changes to commit."
    fi
)