#!/bin/sh
# Copyright (c) Microsoft Corporation. All rights reserved.
# Licensed under the MIT License. See LICENSE in the project root for license information.
#
# Pre-commit hook: validates clang-format on staged C/C++ files.
# Generated by CMake from tools/hooks/pre-commit.in
# Install with: tools\SetupClangFormat.bat
#
# Mode: @WSL_PRE_COMMIT_MODE@ (set WSL_PRE_COMMIT_MODE in UserConfig.cmake)
#   warn  - report formatting issues without blocking the commit (default)
#   error - block the commit when formatting issues are found
#   fix   - automatically fix formatting and re-stage files

MODE="@WSL_PRE_COMMIT_MODE@"
REPO_ROOT="$(git rev-parse --show-toplevel)"
CLANG_FORMAT="$REPO_ROOT/tools/clang-format.exe"

# --- Collect staged C/C++ source files ---
STAGED=$(git diff --cached --name-only --diff-filter=ACM | grep -E '\.(c|cpp|cxx|h|hpp|hxx)$')
if [ -z "$STAGED" ]; then
    exit 0
fi

# --- Verify clang-format is available ---
if [ ! -f "$CLANG_FORMAT" ]; then
    echo "[pre-commit] clang-format not found, skipping. Run 'cmake .' to set up."
    exit 0
fi

# --- fix mode: format in-place and re-stage ---
if [ "$MODE" = "fix" ]; then
    echo "[pre-commit] Fixing formatting..."
    echo "$STAGED" | while IFS= read -r file; do
        "$CLANG_FORMAT" --style=file -i "$REPO_ROOT/$file"
        git add "$REPO_ROOT/$file"
    done
    echo "[pre-commit] Formatting applied and files re-staged."
    exit 0
fi

# --- warn / error mode: check formatting ---
echo "[pre-commit] Checking formatting (mode: $MODE)..."
FILES=$(echo "$STAGED" | sed "s|^|$REPO_ROOT/|")
echo "$FILES" | xargs "$CLANG_FORMAT" --style=file -Werror --dry-run 2>&1
RESULT=$?

if [ $RESULT -ne 0 ]; then
    echo ""
    echo "[pre-commit] Formatting errors found. Run to fix:"
    echo "  powershell FormatSource.ps1 -Staged \$true"
    if [ "$MODE" = "error" ]; then
        exit 1
    fi
    echo "[pre-commit] Continuing commit (mode: warn)."
else
    echo "[pre-commit] All checks passed."
fi