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

ROOT="$(cd "$(dirname "${BASH_SOURCE[0]}")/.." && pwd)"
CORE_IDE_DIR="${ROOT}/core_ide"
PATCH_DIR="${ROOT}/patches/lapce"
SERIES_FILE="${PATCH_DIR}/series"

if [[ ! -d "${CORE_IDE_DIR}/.git" ]]; then
  echo "Missing core_ide git checkout: ${CORE_IDE_DIR}" >&2
  echo "Run: ./scripts/ensure-core-ide.sh" >&2
  exit 1
fi

if [[ ! -f "${SERIES_FILE}" ]]; then
  echo "Missing patch series file: ${SERIES_FILE}" >&2
  exit 1
fi

if [[ -d "${CORE_IDE_DIR}/.git/rebase-apply" ]] || [[ -d "${CORE_IDE_DIR}/.git/rebase-merge" ]]; then
  echo "core_ide has an in-progress rebase/am. Resolve it first." >&2
  exit 1
fi

if [[ -n "$(git -C "${CORE_IDE_DIR}" status --porcelain)" ]]; then
  echo "core_ide working tree is not clean. Commit/stash changes before applying patches." >&2
  exit 1
fi

mapfile -t PATCHES < <(
  sed -e 's/[[:space:]]\+$//' "${SERIES_FILE}" \
    | awk 'NF && $1 !~ /^#/' \
    | cat
)

if [[ ${#PATCHES[@]} -eq 0 ]]; then
  echo "No patches listed in ${SERIES_FILE}. Nothing to apply."
  exit 0
fi

for rel in "${PATCHES[@]}"; do
  patch_path="${PATCH_DIR}/${rel}"
  if [[ ! -f "${patch_path}" ]]; then
    echo "Patch file not found: ${patch_path}" >&2
    exit 1
  fi
  echo "Applying: ${rel}"
  if ! git -C "${CORE_IDE_DIR}" am --3way "${patch_path}"; then
    echo "Patch failed: ${rel}" >&2
    echo "To abort: (cd core_ide && git am --abort)" >&2
    exit 1
  fi
done

echo "OK: applied ${#PATCHES[@]} patch(es) to core_ide."