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

repo="${AYUGRAM_REPO:-AyuGram/AyuGramDesktop}"
tag="${1:?release tag required}"
version="${tag#v}"

tmp="$(mktemp -d)"
trap 'rm -rf "$tmp"' EXIT

archive="${tmp}/AyuGramDesktop-${version}-full.tar.gz"
url="https://github.com/${repo}/releases/download/${tag}/AyuGramDesktop-${version}-full.tar.gz"

echo "Downloading upstream full source archive to resolve its pinned tde2e..." >&2
curl -fsSL --retry 5 --retry-all-errors -o "$archive" "$url"

dockerfile="$(tar -tzf "$archive" | grep -E '(^|/)Telegram/build/docker/centos_env/Dockerfile$' | head -n1 || true)"

if [[ -z "$dockerfile" ]]; then
  echo "Could not find upstream centos_env Dockerfile in the full release archive." >&2
  exit 1
fi

content="$(tar -xOf "$archive" "$dockerfile")"

# Upstream's build environment pins tdlib/tde2e to an exact commit.
td_commit="$(awk '
  /git remote add origin https:\/\/github.com\/tdlib\/td\.git/ { in_td=1; next }
  in_td && /git fetch --depth=1 origin [0-9a-f]{40}/ {
    match($0, /[0-9a-f]{40}/, m)
    print m[0]
    exit
  }
' <<<"$content")"

if [[ -z "$td_commit" ]]; then
  echo "Could not resolve tdlib/tde2e commit from upstream build Dockerfile." >&2
  exit 1
fi

echo "$td_commit"