#!/usr/bin/env bash
set -eu

cd "$(dirname "$0")/.."

if [ -z "${1:-}" ]; then
    echo "Usage: $0 version"
    exit 1
fi

fail() {
    echo "$1"
    exit 1
}

version="$1"

# Check version is a form we expect
[[ "$version" =~ ^[0-9]+\.[0-9]+(-[a-z0-9]+)?$ ]] \
    || fail "Version $version does not look like a full release!"

# Check we're on `main` or `\d+\.x`
branch=$(git rev-parse --abbrev-ref HEAD)
[ "$branch" == "main" ] || [[ "$branch" =~ ^[0-9]+\.x$ ]] || [ "$branch" == "${version}-branch" ] \
    || fail "Current branch '$branch' is not 'main' or a release branch"

is_prerelease=
if [[ "$version" =~ -[0-9a-z]+$ ]]; then
    is_prerelease=1
fi

is_major_release=
if [[ "$version" =~ ^[0-9]+\.0$ ]]; then
    [ "$branch" == "main" ] \
        || fail "Did not expect $version to be released from $branch, expected main"
    is_major_release=1
else
    if [ -n "$is_prerelease" ]; then
        expected_branch="${version}-branch"
    else
        expected_branch="$(echo "$version" | perl -ple 's/\..*/.x/')"
    fi
    [ "$branch" == "$expected_branch" ] \
        || fail "Did not expect $version to be released from $branch, expected $expected_branch"
fi

# shellcheck source=lib/git-tools.bash
. "$(dirname "$0")"/lib/git-tools.bash
require_clean_work_tree 'build and upload a release'

# Check the commit message
commit_msg=$(git rev-list --format=%B --max-count=1 HEAD | tail -n +2)
[ "$commit_msg" == "Release Zulip Server $version." ] \
    || fail "Expected commit message: Release Zulip Server $version."

# Provision
echo "Provisioning.."
if ! ./tools/provision >/dev/null; then
    cat var/log/provision.log
    fail "Provisioning failed!"
fi

# Check lint passes for the changelog
./tools/lint --skip gitlint docs/overview/changelog.md \
    || fail "Changelog does not pass lint"

# Check the date is correct for the release
release_line=$(grep -x -E -m 1 -o "### $version -- ([0-9-]+)" docs/overview/changelog.md) \
    || fail "docs/overview/changelog.md does not contain a line for $version"
expected_date="$(TZ=America/Los_Angeles date +%F)"
[ "$release_line" == "### $version -- $expected_date" ] \
    || fail "Date in docs/overview/changelog.md does not match '$expected_date'"

extract_version() {
    setting="$1"
    value=$(SETTING="$setting" perl -nle 'print $2 if /$ENV{SETTING} = (\"?)([^"]+)\1$/' version.py | head -n1)
    [ -n "$value" ] || fail "Could not find $setting in version.py"
    echo "$value"
}

# Check ZULIP_VERSION and LATEST_RELEASE_VERSION are set appropriately
[ "$(extract_version "ZULIP_VERSION")" == "$version" ] \
    || fail "ZULIP_VERSION in version.py does not match $version"

if [ -z "$is_prerelease" ]; then
    [ "$(extract_version "LATEST_RELEASE_VERSION")" == "$version" ] \
        || fail "LATEST_RELEASE_VERSION in version.py does not match $version"

    if [ -n "$is_major_release" ]; then
        [ "$(extract_version "LATEST_MAJOR_VERSION")" == "$version" ] \
            || fail "LATEST_MAJOR_VERSION in version.py does not match $version"

        # Check that there is an API version bump, which is documented
        changed_api_level=$(git diff-tree -G API_FEATURE_LEVEL HEAD -- version.py)
        [ -n "$changed_api_level" ] || fail "$version did not adjust API_FEATURE_LEVEL in version.py"
        feature_level="$(extract_version "API_FEATURE_LEVEL")"
        grep -q -F -x "**Feature level $feature_level**" templates/zerver/api/changelog.md \
            || fail "Feature level $feature_level is not documented in templates/zerver/api/changelog.md"
    fi
fi

# Check we are auth'd to Github, so we can upload the release
type gh >/dev/null 2>&1 \
    || fail "The 'gh' CLI tool is not installed; see https://cli.github.com/"
gh auth status \
    || fail "Not authenticated to github"

# Extract the changelog, print it
changelog=$(VERSION="$version" perl -nle '$v=quotemeta($ENV{VERSION}); print if $rc = /^### $v/ .. /^#{1,3} (?!$v)/ and $rc !~ /E0/' docs/overview/changelog.md)
echo "$changelog"

echo -e "\n\n(pausing for 15s, ^C to cancel)"
sleep 15

git tag "$version"

OUTPUT_DIR=$(mktemp -d)
export OUTPUT_DIR

./tools/build-release-tarball "$version"

TARBALL="$OUTPUT_DIR/zulip-server-$version.tar.gz"
if ! [ -f "$TARBALL" ]; then
    echo "Did not find expected $TARBALL!"
    exit 1
fi

./tools/upload-release "$TARBALL"

# Push the commits
remote="$(git config zulip.zulipRemote)" || remote=upstream
git push "$remote" "$branch:$branch"
git push "$remote" "$version"

# Upload to Github
params=()
if [ -n "$is_prerelease" ]; then
    params+=("--prerelease")
fi
gh release create "$version" \
    --title "Zulip Server $version" \
    --notes-file <(echo "$changelog") \
    "${params[@]}" \
    "$TARBALL"