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

PROJECT_DIR="${1:-qt5-before/qt5-legacy-migration-benchmark}"

need_cmd() {
  command -v "$1" >/dev/null 2>&1 || {
    echo "ERROR: '$1' not found in PATH." >&2
    exit 1
  }
}

need_cmd entire
need_cmd copilot
need_cmd git

if [ ! -d "$PROJECT_DIR" ]; then
  echo "ERROR: project directory '$PROJECT_DIR' not found." >&2
  exit 1
fi

cd "$PROJECT_DIR"

if [ ! -d .git ]; then
  git init
fi

entire agent add copilot-cli
entire status

git add .
if git diff --cached --quiet; then
  git commit --allow-empty -m "baseline: Qt5/C++11 legacy benchmark before Qt6/C++23 migration"
else
  git commit -m "baseline: Qt5/C++11 legacy benchmark before Qt6/C++23 migration"
fi

entire checkpoint list

cat <<'PROMPT'

Use this prompt in Copilot CLI:

Migrate the legacy Qt5/C++11 desktop application to Qt6/C++23.

Requirements:
- Read the legacy source project from qt5-before/qt5-legacy-migration-benchmark
- Write the migrated project into qt6-after/qt6-migrated-benchmark
- Do not modify the legacy source tree in place
- Update CMake from Qt5 to Qt6
- Keep Core, Gui, and Widgets explicitly linked
- Replace QRegExp with QRegularExpression
- Replace QDesktopWidget / QApplication::desktop() usage with QScreen-based Qt6 APIs
- Remove legacy QTextCodec usage and use modern Qt6-safe text handling
- Modernize old SIGNAL/SLOT syntax to function-pointer connect syntax
- Replace legacy null pointer literals with nullptr
- Preserve the .ui and .qrc integration
- Preserve application behavior
- Upgrade the project from C++11 to C++23
- For every code change inside a method, add at least three tests covering the changed behavior
- Place all generated tests in qt6-after/qt6-migrated-benchmark/tests
- Update CMake so the migrated application and all tests build successfully with CTest
- Keep the test file naming compatible with repository policy checks
- Briefly explain each migration change
PROMPT

copilot

git status --short
git add .

if git diff --cached --quiet; then
  echo "No changes to commit."
  exit 0
fi

git commit -m "migrate: Qt5/C++11 app to Qt6/C++23 with tests and modern Qt APIs"
entire checkpoint list
entire checkpoint explain HEAD || true