#!/usr/bin/env bash
set -euo pipefail

latest_release=$(git describe --abbrev=0 --tags --exclude '*rc*' --exclude '*alpha*' --exclude '*beta*')

bad_app_count=0

no_comment_re='(^[^\s?%])'
## TODO: c source code comments re (in $app_path/c_src dirs)

parse_semver() {
    echo "$1" | tr '.|-' ' '
}

while read -r app; do
    if [ "$app" != "emqx" ]; then
        app_path="$app"
    else
        app_path="."
    fi
    src_file="$app_path/src/$(basename "$app").app.src"

    old_app_exists=0
    git show "$latest_release":"$src_file" >/dev/null 2>&1 || old_app_exists="$?"
    if [ "$old_app_exists" != "0" ]; then
        echo "$app is new, skipping version check"
        continue
    fi

    old_app_version="$(git show "$latest_release":"$src_file" | grep vsn | grep -oE '"[0-9]+\.[0-9]+\.[0-9]+"' | tr -d '"')"
    now_app_version=$(grep -E 'vsn' "$src_file" | grep -oE '"[0-9]+\.[0-9]+\.[0-9]+"' | tr -d '"')
    if [ "$old_app_version" = "$now_app_version" ]; then
        changed_lines="$(git diff "$latest_release"...HEAD --ignore-blank-lines -G "$no_comment_re" \
                             -- "$app_path/src" \
                             -- "$app_path/include" \
                             -- ":(exclude)"$app_path/src/*.appup.src"" \
                             -- "$app_path/priv" \
                             -- "$app_path/c_src" | wc -l ) "
        if [ "$changed_lines" -gt 0 ]; then
            echo "$src_file needs a vsn bump"
            bad_app_count=$(( bad_app_count + 1))
        elif [[ ${app_path} = *emqx_dashboard* ]]; then
            ## emqx_dashboard is ensured to be upgraded after all other plugins
            ## at the end of its appup instructions, there is the final instruction
            ## {apply, {emqx_plugins, load, []}
            ## since we don't know which plugins are stopped during the upgrade
            ## for safty, we just force a dashboard version bump for each and every release
            ## even if there is nothing changed in the app
            echo "$src_file needs a vsn bump to ensure plugins loaded after upgrade"
            bad_app_count=$(( bad_app_count + 1))
        fi
    else
        # shellcheck disable=SC2207
        old_app_version_semver=($(parse_semver "$old_app_version"))
        # shellcheck disable=SC2207
        now_app_version_semver=($(parse_semver "$now_app_version"))
        if  [ "${old_app_version_semver[0]}" = "${now_app_version_semver[0]}" ] && \
            [ "${old_app_version_semver[1]}" = "${now_app_version_semver[1]}" ] && \
            [ "$(( old_app_version_semver[2] + 1 ))" = "${now_app_version_semver[2]}" ]; then
            true
        else
            echo "$src_file: non-strict semver version bump from $old_app_version to $now_app_version"
            bad_app_count=$(( bad_app_count + 1))
        fi
    fi
done < <(./scripts/find-apps.sh)

if [ $bad_app_count -gt 0 ]; then
    exit 1
else
    echo "apps version check successfully"
fi