#!/usr/bin/env bash

# This script downloads the build artifacts along with the signatures, verifies the signatures and
# creates a GitHub draft release. This should be run after `3-verify-build`.

set -eu

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

REPO_ROOT=../../../
PRODUCT_VERSION_PATH=$REPO_ROOT/dist-assets/desktop-product-version.txt
PRODUCT_VERSION=$(cat $PRODUCT_VERSION_PATH)

$REPO_ROOT/scripts/utils/gh-ready-check

REPO_URL="git@github.com:mullvad/mullvadvpn-app"
ARTIFACT_DIR=$(mktemp -d)
REPO_DIR=$(mktemp -d)
CHANGELOG_PATH="$REPO_DIR/CHANGELOG.md"
URL_BASE="https://releases.mullvad.net/desktop/releases"

function download_and_verify {
    # Find GnuPG command to use. Prefer gpg2
    gpg_cmd=$(command -v gpg2 || command -v gpg)

    for ext in .exe _arm64.exe _x64.exe _amd64.deb _arm64.deb _x86_64.rpm _aarch64.rpm .pkg; do
        pkg_filename="MullvadVPN-${PRODUCT_VERSION}${ext}"
        pkg_path="$ARTIFACT_DIR/$pkg_filename"
        url="$URL_BASE/$PRODUCT_VERSION/$pkg_filename"
        echo ">>> Downloading $pkg_filename - $url"
        curl -o "$pkg_path" --progress-bar --fail "$url"
        curl -o "$pkg_path.asc" --progress-bar --fail "$url.asc"

        echo ""
        echo ">>> Verifying integrity of $pkg_filename"
        if ! $gpg_cmd --verify "$pkg_path.asc" "$pkg_path"; then
            echo ""
            echo "!!! INTEGRITY CHECKING FAILED !!!"
            rm "$pkg_path" "$pkg_path.asc"
            exit 1
        fi
        echo ""
        echo "GOOD SIGNATURE IN $pkg_filename"
        echo ""
    done
}

function publish_release {
    echo ">>> Cloning repository to extract changelog"
    git clone --depth 1 --branch "$PRODUCT_VERSION" $REPO_URL "$REPO_DIR" 2> /dev/null > /dev/null
    (cd "$REPO_DIR" && git verify-tag "$PRODUCT_VERSION")
    echo ""

    changelog_end_version_pattern="20[0-9]\{2\}\.[0-9]\{1,2\}"
    if [[ $PRODUCT_VERSION == *-beta* ]]; then
        changelog_end_version_pattern=".*"
    fi

    changelog_extract=$(sed -n "/^## \[$PRODUCT_VERSION\]/,/^## \[$changelog_end_version_pattern\]/p" "$CHANGELOG_PATH")

    changelog=$(echo "$changelog_extract" | sed '$d' | \
        awk 'NF { last = last ? last ORS $0 : $0 } END { print last }')

    release_flags=( --draft --verify-tag --notes-file - --title "$PRODUCT_VERSION" )

    previous_release=$(echo "$changelog_extract" | tail -1 | grep -oP '## \[\K[^\]]+')

    body="This release is for desktop only."
    if [[ $PRODUCT_VERSION == *-beta* ]]; then
        body+="\n\nHere is a list of all changes since last release [$previous_release](https://github.com/mullvad/mullvadvpn-app/releases/tag/$previous_release):"
        release_flags+=(--prerelease)
    else
        body+="\n\nHere is a list of all changes since last stable release [$previous_release](https://github.com/mullvad/mullvadvpn-app/releases/tag/$previous_release):"
        release_flags+=(--latest)
    fi

    version_count=$(echo "$changelog" | grep -c "^## ")
    if [ "$version_count" -eq 1 ]; then
        changelog=$(echo "$changelog" | tail -n +2)
    fi

    body+="\n$changelog"

    echo ">>> Creating GitHub release"
    # shellcheck disable=SC2059
    # shellcheck disable=SC2046
    printf "$body" | gh release create "${release_flags[@]}" "$PRODUCT_VERSION" $(printf "%s " "$ARTIFACT_DIR"/*)
}

download_and_verify
publish_release