#!/bin/bash
# .githooks/pre-commit
# Git hook for BMAD-METHOD contributors to enforce clean commit practices
#
# This hook ensures:
# 1. No direct commits to main
# 2. Provides guidance on amend workflow

set -e

# Color codes for output
RED='\033[0;31m'
YELLOW='\033[1;33m'
GREEN='\033[0;32m'
BLUE='\033[0;34m'
NC='\033[0m' # No Color

# Configuration
MAIN_BRANCH="main"

# Get current branch
CURRENT_BRANCH=$(git branch --show-current)

# 1. Block commits to main
if [ "$CURRENT_BRANCH" = "$MAIN_BRANCH" ]; then
    echo -e "${RED}❌ ERROR: Direct commits to '$MAIN_BRANCH' are not allowed!${NC}"
    echo ""
    echo -e "${YELLOW}The main branch should only be updated by syncing with upstream.${NC}"
    echo -e "${YELLOW}To work on changes:${NC}"
    echo -e "  1. Create a feature branch: git checkout -b feat/your-feature"
    echo -e "  2. Make your changes"
    echo -e "  3. Commit: git commit -m 'feat: your feature description'"
    echo -e "  4. Push: git push -u origin feat/your-feature"
    exit 1
fi

# 2. Check if this is an amend
if [ -f ".git/COMMIT_EDITMSG" ]; then
    # Get the count of commits ahead of main
    COMMIT_COUNT=$(git rev-list --count "${MAIN_BRANCH}..${CURRENT_BRANCH}" 2>/dev/null || echo "0")
    
    # If we have exactly 1 commit and user is making another commit (not amending),
    # suggest using amend instead
    if [ "$COMMIT_COUNT" -eq 1 ] && [ -z "$GIT_REFLOG_ACTION" ]; then
        # Check if this is likely a new commit (not an amend)
        # by seeing if the commit message is being edited
        if ! git diff --cached --quiet; then
            echo -e "${BLUE}[pre-commit] Info: You have 1 commit on this branch${NC}"
            echo -e "${YELLOW}💡 Tip: Consider using 'git commit --amend' to update your existing commit${NC}"
            echo -e "${YELLOW}   This maintains the single-commit-per-branch workflow.${NC}"
            echo ""
            echo -e "${YELLOW}To amend:${NC}"
            echo -e "  git add <your-files>"
            echo -e "  git commit --amend"
            echo ""
            echo -e "${YELLOW}Proceeding with new commit...${NC}"
            # This is just a helpful tip, not blocking
        fi
    fi
fi

echo -e "${GREEN}✓ Pre-commit checks passed${NC}"
exit 0