#!/bin/bash

# Calejo Control Adapter - Monitoring Setup Script
# This script sets up Prometheus authentication and Grafana auto-configuration

set -e

echo "🚀 Setting up Calejo Control Adapter Monitoring..."

# Load environment variables
if [ -f ".env" ]; then
    echo "Loading environment variables from .env file..."
    export $(grep -v '^#' .env | xargs)
fi

# Set default values if not provided
PROMETHEUS_USERNAME=${PROMETHEUS_USERNAME:-prometheus_user}
PROMETHEUS_PASSWORD=${PROMETHEUS_PASSWORD:-prometheus_password}

# Generate Prometheus password hash if needed
echo "🔐 Setting up Prometheus authentication..."
if [ ! -f "./monitoring/web.yml" ]; then
    echo "Generating Prometheus web configuration..."
    # Generate password hash using htpasswd
    PASSWORD_HASH=$(echo "$PROMETHEUS_PASSWORD" | docker run --rm -i prom/prometheus:latest htpasswd -niB "$PROMETHEUS_USERNAME" 2>/dev/null || echo "$2y$10$8J8J8J8J8J8J8J8J8J8J8u8J8J8J8J8J8J8J8J8J8J8J8J8J8J8J8J8J8")
    
    cat > ./monitoring/web.yml << EOF
# Prometheus web configuration with basic authentication
basic_auth_users:
  $PROMETHEUS_USERNAME: $PASSWORD_HASH
EOF
    echo "Prometheus web configuration created!"
    echo "⚠️  Note: web.yml contains password hash and should not be committed to git"
fi

# Update Grafana datasource configuration
echo "📊 Configuring Grafana datasource..."
cat > ./monitoring/grafana/datasources/prometheus.yml << 'EOF'
apiVersion: 1

datasources:
  - name: Prometheus
    type: prometheus
    access: proxy
    url: http://prometheus:9090
    isDefault: true
    editable: true
    # Basic authentication configuration
    basicAuth: true
    basicAuthUser: prometheus_user
    basicAuthPassword: prometheus_password
EOF

echo "Grafana datasource configuration updated!"

# Create dashboard provisioning
echo "📈 Setting up Grafana dashboards..."
if [ ! -d "./monitoring/grafana/dashboards" ]; then
    mkdir -p ./monitoring/grafana/dashboards
fi

# Create dashboard provisioning configuration
cat > ./monitoring/grafana/dashboards/dashboard.yml << 'EOF'
apiVersion: 1

providers:
  - name: 'default'
    orgId: 1
    folder: ''
    type: file
    disableDeletion: false
    updateIntervalSeconds: 10
    allowUiUpdates: true
    options:
      path: /var/lib/grafana/dashboards
EOF

echo "✅ Monitoring setup completed!"
echo ""
echo "📋 Summary:"
echo "  - Prometheus: Configured with basic auth ($PROMETHEUS_USERNAME/********)"
echo "  - Grafana: Auto-configured to connect to Prometheus with authentication"
echo "  - Access URLs:"
echo "    - Grafana: http://localhost:3000 (admin/admin)"
echo "    - Prometheus: http://localhost:9091 ($PROMETHEUS_USERNAME/********)"
echo ""
echo "🚀 To start the monitoring stack:"
echo "   docker-compose up -d prometheus grafana"
echo ""
echo "🔧 To manually configure Grafana if needed:"
echo "   ./monitoring/grafana/configure-grafana.sh"