#!/bin/bash
# Verify Flea's published source archive against its checksum manifest when a
# newer stable release exists, then check its root.
#
# Through 0.1.x this also grepped the source for the upstream security fixes
# Omarchy once carried as patches, so the package could not move to a release
# that lacked them. Every release since 0.1.5 has had them, and matching
# literal source lines only ever caught renames (#488, 0.3.5's
# open_if_regular_with_meta), never a regression.
set -euo pipefail

REPO='thisisgm/flea'
RELEASES_URL="https://api.github.com/repos/$REPO/releases?per_page=100"

current=$(awk -F= '/^pkgver=/ { print $2; exit }' PKGBUILD)
releases=$(curl -fsSL "$RELEASES_URL")
now=$(date +%s)
min_age=${MIN_RELEASE_AGE_SECONDS:-0}

candidates=0
best_version=''
best_tag=''
best_published_at=''

while IFS=$'\t' read -r tag published_at; do
  if [[ ! $tag =~ ^v([0-9]+\.[0-9]+\.[0-9]+)$ ]]; then
    printf '%s has an unusable stable release tag: %s\n' "$REPO" "${tag:-<empty>}" >&2
    exit 1
  fi
  version=${BASH_REMATCH[1]}

  if [[ -z $published_at ]] || ! published_epoch=$(date --date="$published_at" +%s 2>/dev/null); then
    printf '%s release %s has an invalid publication time\n' "$REPO" "$tag" >&2
    exit 1
  fi
  candidates=$((candidates + 1))

  if (( now - published_epoch < min_age )) && [[ ${BYPASS_MIN_RELEASE_AGE:-} != 1 ]]; then
    continue
  fi

  if [[ -z $best_version ]] || (( $(vercmp "$version" "$best_version") > 0 )); then
    best_version=$version
    best_tag=$tag
    best_published_at=$published_at
  fi
done < <(jq -r '.[] | select((.draft or .prerelease) | not) | [.tag_name // "", .published_at // ""] | @tsv' <<<"$releases")

if (( candidates == 0 )); then
  printf 'No stable releases found for %s\n' "$REPO" >&2
  exit 1
fi

if [[ -z $best_version ]] || (( $(vercmp "$best_version" "$current") <= 0 )); then
  echo '{}'
  exit 0
fi

tarball=$(mktemp)
trap 'rm -f "$tarball"' EXIT
release_url="https://github.com/$REPO/releases/download/$best_tag"
asset="flea-$best_tag.tar.gz"
checksums=$(curl -fsSL "$release_url/SHASUMS256.txt")
expected_sum=$(awk -v asset="$asset" '$2 == asset { print $1 }' <<<"$checksums")
if [[ ! $expected_sum =~ ^[0-9a-f]{64}$ ]]; then
  printf 'Release %s has no unique SHA-256 checksum for %s\n' "$best_tag" "$asset" >&2
  exit 1
fi
curl -fsSL -o "$tarball" "$release_url/$asset"
source_sum=$(sha256sum "$tarball" | cut -d' ' -f1)
if [[ $source_sum != "$expected_sum" ]]; then
  printf 'Release %s source archive does not match its checksum manifest\n' "$best_tag" >&2
  exit 1
fi

expected_root="flea-$best_version"
served_roots=$(tar -tzf "$tarball" | cut -d/ -f1 | sort -u)
if [[ $served_roots != "$expected_root" ]]; then
  printf 'Release %s contains root %s, expected %s\n' "$best_tag" "$served_roots" "$expected_root" >&2
  exit 1
fi

jq -n \
  --arg pkgver "$best_version" \
  --arg published_at "$best_published_at" \
  --arg source "$source_sum" \
  '{pkgver: $pkgver, published_at: $published_at, sha256sums: {any: [$source]}}'