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

TOOL_ROOT="$(CDPATH= cd -- "$(dirname -- "${BASH_SOURCE[0]}")/.." && pwd -P)"
MCP_REPOSITORY="https://github.com/jasonjgardner/blockbench-mcp-plugin.git"
MCP_COMMIT="6b069e308fdfc9b0a1c15bc924ca78150815f143"
MCP_PATCH="${TOOL_ROOT}/patches/0001-projectcapture-hardening.patch"
MCP_PATCH_SHA256="9de0b3767e96db7a68ef4c7082d7c76bf140b4932fc9550ad6e99d9a24a048c3"
BUN_VERSION="1.3.14"

require_command() {
  command -v "$1" >/dev/null 2>&1 || {
    printf 'Fehlendes Werkzeug: %s\n' "$1" >&2
    exit 1
  }
}

sha256_file() {
  if command -v shasum >/dev/null 2>&1; then
    shasum -a 256 "$1" | awk '{print $1}'
  elif command -v sha256sum >/dev/null 2>&1; then
    sha256sum "$1" | awk '{print $1}'
  else
    printf 'Weder shasum noch sha256sum ist verfügbar.\n' >&2
    exit 1
  fi
}

verify_patch() {
  local actual
  actual="$(sha256_file "${MCP_PATCH}")"
  if [[ "${actual}" != "${MCP_PATCH_SHA256}" ]]; then
    printf 'Patch-Hash stimmt nicht: erwartet %s, erhalten %s\n' \
      "${MCP_PATCH_SHA256}" "${actual}" >&2
    exit 1
  fi
}

prepare_source() {
  local destination="$1"
  if [[ -z "${destination}" || -e "${destination}" ]]; then
    printf 'Temporäres Ziel muss neu und nicht vorhanden sein: %s\n' "${destination}" >&2
    exit 1
  fi
  verify_patch
  git clone --quiet --filter=blob:none --no-checkout "${MCP_REPOSITORY}" "${destination}"
  git -C "${destination}" checkout --quiet --detach "${MCP_COMMIT}"
  local resolved
  resolved="$(git -C "${destination}" rev-parse HEAD)"
  if [[ "${resolved}" != "${MCP_COMMIT}" ]]; then
    printf 'Upstream-Commit stimmt nicht: %s\n' "${resolved}" >&2
    exit 1
  fi
  git -C "${destination}" apply --check "${MCP_PATCH}"
  git -C "${destination}" apply "${MCP_PATCH}"
  git -C "${destination}" diff --check
}

make_stage_parent() {
  mktemp -d "${TMPDIR:-/tmp}/projectcapture-blockbench-mcp.XXXXXX"
}

safe_remove_stage() {
  local stage="$1"
  local leaf
  leaf="$(basename -- "${stage}")"
  if [[ -d "${stage}" && ! -L "${stage}" && "${leaf}" == projectcapture-blockbench-mcp.* ]]; then
    rm -rf -- "${stage}"
  else
    printf 'Unsicheres temporäres Löschziel wurde nicht entfernt: %s\n' "${stage}" >&2
  fi
}

run_bun() {
  pnpm dlx "bun@${BUN_VERSION}" "$@"
}

write_dist_checksums() {
  local output_dir="$1"
  local checksum_file="${output_dir}/SHA256SUMS"
  local temporary_file="${checksum_file}.tmp.$$"
  local artifact

  : > "${temporary_file}"
  for artifact in \
    hytale_plugin-0.9.1.js \
    mcp-about.md \
    mcp-icon.svg \
    mcp-projectcapture-1.6.1.js; do
    if [[ -f "${output_dir}/${artifact}" && ! -L "${output_dir}/${artifact}" ]]; then
      printf '%s  %s\n' "$(sha256_file "${output_dir}/${artifact}")" "${artifact}" \
        >> "${temporary_file}"
    fi
  done
  mv -- "${temporary_file}" "${checksum_file}"
}