#!/bin/bash

# CTO AI Delegation - Git-Native Auto-Merge Setup
# Uses git hooks for automatic merging to INTEGRATION-WIP

set -e

echo "🔧 CTO AI Delegation - Git-Native Auto-Merge Setup"
echo "================================================="
echo "Setting up automatic merging to INTEGRATION-WIP using git hooks"

# Validate we're in a git repository
if [ ! -d ".git" ]; then
    echo "❌ Error: Not in a git repository"
    echo "🔧 Run this from your project root directory"
    exit 1
fi

# Check if INTEGRATION-WIP branch exists
if ! git show-ref --quiet refs/heads/INTEGRATION-WIP; then
    echo "❌ Error: INTEGRATION-WIP branch not found!"
    echo "🔧 Run the bootstrap process first from docs/AGENT-LLM.MD"
    exit 1
fi

# Create hooks directory if it doesn't exist
mkdir -p .git/hooks

echo "🔧 Setting up git hooks for automatic integration..."

# Create post-commit hook for auto-merge to INTEGRATION-WIP
cat > .git/hooks/post-commit << 'EOF'
#!/bin/bash

# CTO AI Delegation - Auto-merge to INTEGRATION-WIP
# Runs after every commit on feature branches or bootstrap

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

# Only auto-merge from feature branches and bootstrap
if [[ "$CURRENT_BRANCH" == feature/* ]] || [[ "$CURRENT_BRANCH" == "bootstrap" ]]; then
    echo "🔄 Auto-merging $CURRENT_BRANCH to INTEGRATION-WIP..."
    
    # Save current branch
    ORIGINAL_BRANCH="$CURRENT_BRANCH"
    
    # Switch to INTEGRATION-WIP and merge
    if git checkout INTEGRATION-WIP 2>/dev/null; then
        if git merge "$ORIGINAL_BRANCH" --no-ff -m "🔄 Auto-Integration: $ORIGINAL_BRANCH → INTEGRATION-WIP

Branch: $ORIGINAL_BRANCH
Commit: $(git rev-parse HEAD)
Timestamp: $(date -u '+%Y-%m-%d %H:%M:%S UTC')

🤖 CTO AI Delegation Framework - Git-Native Auto-Merge"; then
            echo "✅ Successfully auto-merged $ORIGINAL_BRANCH to INTEGRATION-WIP"
            
            # Switch back to original branch
            git checkout "$ORIGINAL_BRANCH"
        else
            echo "❌ Auto-merge failed due to conflicts"
            echo "🚨 Manual resolution required:"
            echo "   1. Resolve conflicts in INTEGRATION-WIP"
            echo "   2. Complete the merge manually"
            echo "   3. Return to your feature branch: git checkout $ORIGINAL_BRANCH"
            
            # Abort the merge and return to original branch
            git merge --abort 2>/dev/null || true
            git checkout "$ORIGINAL_BRANCH" 2>/dev/null || true
        fi
    else
        echo "❌ Could not switch to INTEGRATION-WIP branch"
    fi
fi
EOF

# Make post-commit hook executable
chmod +x .git/hooks/post-commit

# Create post-merge hook to handle pulled changes
cat > .git/hooks/post-merge << 'EOF'
#!/bin/bash

# CTO AI Delegation - Post-merge auto-integration
# Handles integration after pull/merge operations

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

# Only process feature branches and bootstrap
if [[ "$CURRENT_BRANCH" == feature/* ]] || [[ "$CURRENT_BRANCH" == "bootstrap" ]]; then
    # Check if we're not already on INTEGRATION-WIP
    if [[ "$CURRENT_BRANCH" != "INTEGRATION-WIP" ]]; then
        echo "🔄 Post-merge: Updating INTEGRATION-WIP with $CURRENT_BRANCH changes..."
        
        # Save current branch
        ORIGINAL_BRANCH="$CURRENT_BRANCH"
        
        # Auto-merge to INTEGRATION-WIP
        if git checkout INTEGRATION-WIP 2>/dev/null; then
            if git merge "$ORIGINAL_BRANCH" --no-ff -m "🔄 Post-Merge Integration: $ORIGINAL_BRANCH → INTEGRATION-WIP

Branch: $ORIGINAL_BRANCH
Trigger: Post-merge hook
Timestamp: $(date -u '+%Y-%m-%d %H:%M:%S UTC')

🤖 CTO AI Delegation Framework - Git-Native Auto-Merge"; then
                echo "✅ Successfully updated INTEGRATION-WIP with $ORIGINAL_BRANCH changes"
            else
                echo "⚠️  Integration conflicts detected - manual resolution may be needed"
                git merge --abort 2>/dev/null || true
            fi
            
            # Return to original branch
            git checkout "$ORIGINAL_BRANCH" 2>/dev/null || true
        fi
    fi
fi
EOF

# Make post-merge hook executable
chmod +x .git/hooks/post-merge

# Create a push hook to ensure INTEGRATION-WIP is also pushed
cat > .git/hooks/pre-push << 'EOF'
#!/bin/bash

# CTO AI Delegation - Ensure INTEGRATION-WIP is pushed
# Automatically push INTEGRATION-WIP when feature branches are pushed

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

# If pushing a feature branch or bootstrap, also push INTEGRATION-WIP
if [[ "$CURRENT_BRANCH" == feature/* ]] || [[ "$CURRENT_BRANCH" == "bootstrap" ]]; then
    # Check if INTEGRATION-WIP has unpushed commits
    if git diff --quiet origin/INTEGRATION-WIP INTEGRATION-WIP 2>/dev/null; then
        echo "📋 INTEGRATION-WIP is up to date"
    else
        echo "🔄 Auto-pushing updated INTEGRATION-WIP..."
        git push origin INTEGRATION-WIP || {
            echo "⚠️  Could not push INTEGRATION-WIP - may need manual push later"
        }
    fi
fi
EOF

# Make pre-push hook executable  
chmod +x .git/hooks/pre-push

echo ""
echo "✅ Git-native auto-merge setup complete!"
echo ""
echo "📋 How it works:"
echo "   1. Every commit on feature branches or bootstrap automatically merges to INTEGRATION-WIP"
echo "   2. Conflicts are handled gracefully with clear error messages"
echo "   3. INTEGRATION-WIP is automatically pushed when you push feature branches"
echo "   4. No external workflows or runners required - pure git!"
echo ""
echo "🧪 Test the setup:"
echo "   1. Create a test commit on a feature branch"
echo "   2. Check INTEGRATION-WIP branch for the auto-merge"
echo "   3. Push your feature branch and verify INTEGRATION-WIP is also pushed"
echo ""
echo "🎯 Git-native integration automation ready!"

# Update AGENT-LLM.MD to reflect git-native approach
if grep -q "INTEGRATION AUTOMATION" docs/AGENT-LLM.MD; then
    # Replace existing automation section
    sed -i '/## INTEGRATION AUTOMATION/,/^##/{/^##/!d;}' docs/AGENT-LLM.MD
    sed -i '/## INTEGRATION AUTOMATION/d' docs/AGENT-LLM.MD
fi

# Add updated integration info
cat >> docs/AGENT-LLM.MD << 'EOF'

## INTEGRATION AUTOMATION (GIT-NATIVE)
**Automatic process - no action required by AI agents:**
- Every commit on feature branches automatically merges to INTEGRATION-WIP
- Uses git hooks (no external workflows required)
- Conflicts handled gracefully with clear error messages
- INTEGRATION-WIP automatically pushed when feature branches are pushed
- Pure git-native solution - no Gitea Actions needed
EOF

echo ""
echo "✅ Updated docs/AGENT-LLM.MD with git-native integration info"
echo ""
echo "🚀 Ready for automatic git-native integration!"