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

# build_grantlee_qt6.sh - build grantlee with pragmatic Qt6 patches and install to INSTALL_PREFIX
QT_ROOT=${QT_ROOT:-/opt/Qt/6.8.3/gcc_64}
INSTALL_PREFIX=${INSTALL_PREFIX:-/usr/local}

echo "Building Grantlee (attempt Qt6 port) into ${INSTALL_PREFIX} using QT_ROOT=${QT_ROOT}"
TMPDIR=$(mktemp -d)
trap 'rm -rf "$TMPDIR"' EXIT
cd "$TMPDIR"

if ! git clone --depth 1 https://github.com/steveire/grantlee.git grantlee; then
  echo "Failed to clone grantlee" >&2
  exit 1
fi

# Ensure dev packages required for building (xkb headers etc.)
if command -v sudo >/dev/null 2>&1; then
  sudo apt-get update -y || true
  sudo apt-get install -y --no-install-recommends libxkbcommon-dev libxkbcommon-x11-dev pkg-config || true
fi

pushd grantlee >/dev/null
# Backup relevant files
git ls-files | grep -E "CMakeLists.txt|\\.cmake$" | xargs -r -n1 -I{} cp {} {}.bak || true

# Python-based safe patches
python3 - <<'PY'
import re
from pathlib import Path
# first, convert find_package(Qt5 COMPONENTS ...) preserving components
pat_fp = re.compile(r'find_package\s*\(\s*Qt5\s+COMPONENTS\s+([^\)]+)\)', re.M)
# map find_package(Qt5 Test) forms to Qt6 Test
pat_test_simple = re.compile(r'find_package\s*\(\s*Qt5\s+Test(?:\s+REQUIRED)?\s*\)', re.M)
for p in Path('.').rglob('*'):
    if p.is_file() and (p.name=='CMakeLists.txt' or p.suffix=='.cmake'):
        try:
            s = p.read_text()
            s2 = pat_fp.sub(lambda m: 'find_package(Qt6 REQUIRED COMPONENTS %s)'%m.group(1).strip(), s)
            s2 = pat_test_simple.sub('find_package(Qt6 Test REQUIRED)', s2)
            if s2 != s:
                p.write_text(s2)
                print('Patched find_package components in', p)
        except Exception as e:
            print('Skipping', p, 'error', e)

# generic replacements
patterns = [
  (re.compile(r'find_package\s*\(\s*Qt5[^)]*\)', re.M), 'find_package(Qt6 REQUIRED COMPONENTS Core Widgets)'),
  (re.compile(r'Qt5::'), 'Qt6::'),
  (re.compile(r'QT5_WRAP_CPP'), 'QT_WRAP_CPP'),
  (re.compile(r'qt5_add_resources'), 'qt_add_resources'),
  (re.compile(r'qt5_add_translations'), 'qt_add_translations'),
  (re.compile(r'qt5_add_translation'), 'qt_add_translation'),
]
for p in Path('.').rglob('*'):
    if p.is_file() and (p.name=='CMakeLists.txt' or p.suffix=='.cmake'):
        try:
            s = p.read_text()
            orig = s
            for pat, repl in patterns:
                s = pat.sub(repl, s)
            if s != orig:
                p.write_text(s)
                print('Patched', p)
        except Exception as e:
            print('Skipping', p, 'error', e)

# remove explicit QT_TESTCASE_BUILDDIR compile definitions to avoid duplicate -D on command line
pat_qt_test_def = re.compile(r"^\s*target_compile_definitions\([^\n]*QT_TESTCASE_BUILDDIR[^\n]*\)\s*$", re.M)
for p in Path('.').rglob('*'):
    if p.is_file() and p.name=='CMakeLists.txt':
        try:
            s = p.read_text()
            s2 = pat_qt_test_def.sub(lambda m: '# PATCHED: removed QT_TESTCASE_BUILDDIR definition to avoid macro redefinition', s)
            if s2 != s:
                p.write_text(s2)
                print('Removed QT_TESTCASE_BUILDDIR in', p)
        except Exception as e:
            print('Skipping', p, 'error', e)

# ensure files linking to Qt6::Test have a find_package(Qt6 Test REQUIRED)
for p in Path('.').rglob('*'):
    if p.is_file() and (p.name=='CMakeLists.txt' or p.suffix=='.cmake'):
        try:
            s = p.read_text()
            if 'Qt6::Test' in s and 'find_package(Qt6 Test' not in s:
                s = 'find_package(Qt6 COMPONENTS Test REQUIRED)\n' + s
                p.write_text(s)
                print('Inserted find_package(Qt6 Test REQUIRED) in', p)
        except Exception as e:
            print('Skipping', p, 'error', e)
PY

popd >/dev/null

mkdir -p grantlee/build
cd grantlee/build
cmake -DCMAKE_BUILD_TYPE=Release \
      -DCMAKE_INSTALL_PREFIX="${INSTALL_PREFIX}" \
      -DCMAKE_PREFIX_PATH="${QT_ROOT}:${INSTALL_PREFIX}" \
      ${DISABLE_TESTS:+-DBUILD_TESTING=OFF} ..

cmake --build . -- -j$(nproc) || true
cmake --install . || true

echo "Grantlee attempted build finished"
exit 0