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

root="$(cd "$(dirname "${BASH_SOURCE[0]}")/.." && pwd)"
staging_root="${NEXO_UPSTREAM_ROOT:-"$root/.upstream/mattermost"}"

preflight_repo() {
  local name="$1"
  local dir="$staging_root/$name"

  if [ -d "$dir/.git" ]; then
    if [ -n "$(git -C "$dir" status --porcelain)" ]; then
      echo "refuse dirty upstream staging clone: $dir" >&2
      exit 1
    fi
  elif [ -e "$dir" ]; then
    echo "refuse non-git upstream staging path: $dir" >&2
    exit 1
  fi
}

sync_repo() {
  local name="$1"
  local url="$2"
  local branch="$3"
  local target="$4"
  local dir="$staging_root/$name"

  mkdir -p "$staging_root"

  if [ -d "$dir/.git" ]; then
    git -C "$dir" checkout -q "$branch"
    git -C "$dir" pull --ff-only --depth 1 origin "$branch"
  else
    git clone --depth 1 --single-branch --branch "$branch" "$url" "$dir"
  fi

  local commit
  commit="$(git -C "$dir" rev-parse HEAD)"
  echo "$name"
  echo "  source: $url"
  echo "  branch: $branch"
  echo "  commit: $commit"
  echo "  staging: ${dir#"$root"/}"
  echo "  snapshot target: $target"
}

preflight_repo "mattermost"
preflight_repo "mattermost-mobile"
preflight_repo "mattermost-push-proxy"

sync_repo "mattermost" "https://github.com/mattermost/mattermost.git" "master" "services/core/"
sync_repo "mattermost-mobile" "https://github.com/mattermost/mattermost-mobile.git" "main" "apps/mattermost/"
sync_repo "mattermost-push-proxy" "https://github.com/mattermost/mattermost-push-proxy.git" "master" "services/push-proxy/"

cat <<EOF

Upstream staging is ready at ${staging_root#"$root"/}.
This command does not copy snapshots into apps/ or services/.
Review diffs, run smoke checks, then update one snapshot target per merge request.
EOF