#!/bin/bash

# Renovate Configuration Validator
# This script validates the renovate.json configuration and checks for common issues

set -e

echo "🔍 Renovate Configuration Validator"
echo "=================================="

# Check if renovate.json exists
if [ ! -f "renovate.json" ]; then
    echo "❌ renovate.json not found in current directory"
    exit 1
fi

echo "✓ Found renovate.json"

# Check if Node.js is available
if ! command -v node &> /dev/null; then
    echo "⚠️  Node.js not found, installing..."
    # For Ubuntu/Debian systems
    if command -v apt-get &> /dev/null; then
        curl -fsSL https://deb.nodesource.com/setup_20.x | sudo -E bash -
        sudo apt-get install -y nodejs
    else
        echo "❌ Please install Node.js 18+ to validate configuration"
        exit 1
    fi
fi

# Install renovate CLI if not present
if ! command -v renovate &> /dev/null; then
    echo "📦 Installing Renovate CLI..."
    # Check Node.js version and install compatible Renovate version
    NODE_VERSION=$(node --version | cut -d'v' -f2)
    if [[ $(echo "$NODE_VERSION 24.10.0" | awk '{print ($1 >= $2)}') == 1 ]]; then
        echo "Installing latest Renovate for Node.js $NODE_VERSION"
        npm install -g renovate@latest
    else
        echo "Installing compatible Renovate version for Node.js $NODE_VERSION"
        npm install -g renovate@40.3.2
    fi
fi

echo "✓ Renovate CLI available"

# Validate configuration syntax
echo ""
echo "🔧 Validating renovate.json syntax..."

# First, validate JSON syntax
if ! node -e "
try {
    const config = JSON.parse(require('fs').readFileSync('renovate.json', 'utf8'));
    console.log('✓ JSON syntax is valid');
    console.log('✓ Configuration has', Object.keys(config).length, 'top-level properties');
} catch(e) {
    console.error('❌ JSON syntax error:', e.message);
    process.exit(1);
}"; then
    exit 1
fi

# Then, test Renovate can parse the config (basic validation)
echo "🔍 Testing Renovate configuration parsing..."
if timeout 30 renovate --dry-run --log-level=warn . 2>&1 | grep -qi "error\|fatal"; then
    echo "⚠️ Renovate reported warnings/errors during config parsing"
    echo "ℹ️ Run 'renovate --dry-run --log-level=debug .' for detailed analysis"
    echo "ℹ️ This may be normal for first-time setup"
else
    echo "✓ Renovate configuration parsing completed"
fi

# Check for required package files
echo ""
echo "📋 Checking for supported package managers..."

PACKAGE_FILES_FOUND=0

# Python (uv/pip)
if [ -f "backend/pyproject.toml" ]; then
    echo "✓ Python: backend/pyproject.toml"
    PACKAGE_FILES_FOUND=$((PACKAGE_FILES_FOUND + 1))
fi

# Node.js (npm/yarn)
if [ -f "frontend/package.json" ]; then
    echo "✓ Node.js: frontend/package.json"
    PACKAGE_FILES_FOUND=$((PACKAGE_FILES_FOUND + 1))
fi

# Docker
DOCKERFILE_COUNT=$(find . -name "Dockerfile*" -type f | wc -l)
if [ $DOCKERFILE_COUNT -gt 0 ]; then
    echo "✓ Docker: $DOCKERFILE_COUNT Dockerfile(s) found"
    PACKAGE_FILES_FOUND=$((PACKAGE_FILES_FOUND + 1))
fi

# GitHub Actions (if any)
WORKFLOW_COUNT=$(find .gitea/workflows -name "*.yml" -o -name "*.yaml" 2>/dev/null | wc -l)
if [ $WORKFLOW_COUNT -gt 0 ]; then
    echo "✓ Gitea Actions: $WORKFLOW_COUNT workflow(s) found"
fi

if [ $PACKAGE_FILES_FOUND -eq 0 ]; then
    echo "⚠️  No supported package files found"
    echo "   Renovate looks for: pyproject.toml, package.json, Dockerfile, etc."
else
    echo "✓ Found $PACKAGE_FILES_FOUND package manager types"
fi

# Validate common configuration issues
echo ""
echo "🔍 Checking configuration best practices..."

# Check for timezone setting
if grep -q "timezone" renovate.json; then
    echo "✓ Timezone configured"
else
    echo "ℹ️  Consider adding timezone setting for consistent scheduling"
fi

# Check for schedule configuration
if grep -q "schedule" renovate.json; then
    echo "✓ Update schedule configured"
else
    echo "ℹ️  Consider adding schedule to control when updates run"
fi

# Check for automerge rules
if grep -q "automerge" renovate.json; then
    echo "✓ Automerge rules configured"
else
    echo "ℹ️  Consider configuring automerge for safe updates"
fi

# Check for vulnerability alerts
if grep -q "vulnerabilityAlerts\|osvVulnerabilityAlerts" renovate.json; then
    echo "✓ Security vulnerability alerts enabled"
else
    echo "⚠️  Consider enabling vulnerability alerts for security updates"
fi

echo ""
echo "🚀 Next Steps for Gitea Setup:"
echo "1. Create a Gitea API token with repository access"
echo "2. Add the token as RENOVATE_TOKEN in repository secrets"
echo "3. Enable the renovate.yml workflow in Gitea Actions"
echo "4. Test with manual workflow trigger (dry-run mode)"
echo ""
echo "📚 Documentation: docs/RENOVATE_SETUP_GUIDE.md"
echo ""
echo "✅ Configuration validation complete!"