#!/bin/bash

# Portfolio Deployment Script
# Usage: ./scripts/deploy.sh [environment]

set -e

# Configuration
ENVIRONMENT=${1:-production}
REGISTRY="ghcr.io"
IMAGE_NAME="dennis-konkol/my_portfolio"
CONTAINER_NAME="portfolio-app"
COMPOSE_FILE="docker-compose.zero-downtime.yml"

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

# Logging function
log() {
    echo -e "${BLUE}[$(date +'%Y-%m-%d %H:%M:%S')]${NC} $1"
}

error() {
    echo -e "${RED}[ERROR]${NC} $1" >&2
}

success() {
    echo -e "${GREEN}[SUCCESS]${NC} $1"
}

warning() {
    echo -e "${YELLOW}[WARNING]${NC} $1"
}

# Check if running as root (skip in CI environments)
if [[ $EUID -eq 0 ]] && [[ -z "$CI" ]]; then
   error "This script should not be run as root (use CI=true to override)"
   exit 1
fi

# Check if Docker is running
if ! docker info > /dev/null 2>&1; then
    error "Docker is not running. Please start Docker and try again."
    exit 1
fi

# Check if docker compose is available
if ! docker compose version &> /dev/null; then
    error "docker compose is not available. Please ensure Docker is installed and try again."
    exit 1
fi

# Check if .env file exists
if [ ! -f .env ]; then
    error ".env file not found. Please create it with the required environment variables."
    exit 1
fi

log "Starting deployment for environment: $ENVIRONMENT"

# Set image tag based on environment
if [ "$ENVIRONMENT" = "production" ]; then
    IMAGE_TAG="production"
else
    IMAGE_TAG="main"
fi

FULL_IMAGE_NAME="$REGISTRY/$IMAGE_NAME:$IMAGE_TAG"

log "Using image: $FULL_IMAGE_NAME"

# Login to registry (if needed)
log "Logging in to container registry..."
echo "$GITHUB_TOKEN" | docker login $REGISTRY -u $GITHUB_ACTOR --password-stdin || {
    warning "Failed to login to registry. Make sure GITHUB_TOKEN and GITHUB_ACTOR are set."
}

# Build latest image locally
log "Building latest image locally..."
docker build -t portfolio-app:latest . || {
    error "Failed to build image locally"
    exit 1
}

# Stop and remove old containers
log "Stopping old containers..."
docker compose -f $COMPOSE_FILE down || {
    warning "No old containers to stop"
}

# Remove old images (keep last 3 versions)
log "Cleaning up old images..."
docker images $REGISTRY/$IMAGE_NAME --format "table {{.Tag}}\t{{.ID}}" | tail -n +2 | head -n -3 | awk '{print $2}' | xargs -r docker rmi || {
    warning "No old images to remove"
}

# Start new containers
log "Starting new containers..."
docker compose -f $COMPOSE_FILE up -d || {
    error "Failed to start containers"
    exit 1
}

# Wait for health check
log "Waiting for application to be healthy..."
HEALTH_CHECK_TIMEOUT=60
HEALTH_CHECK_INTERVAL=2
ELAPSED=0

while [ $ELAPSED -lt $HEALTH_CHECK_TIMEOUT ]; do
    if curl -f http://localhost/api/health > /dev/null 2>&1; then
        success "Application is healthy!"
        break
    fi
    
    sleep $HEALTH_CHECK_INTERVAL
    ELAPSED=$((ELAPSED + HEALTH_CHECK_INTERVAL))
    echo -n "."
done

if [ $ELAPSED -ge $HEALTH_CHECK_TIMEOUT ]; then
    error "Health check timeout. Application may not be running properly."
    log "Container logs:"
    docker compose -f $COMPOSE_FILE logs --tail=50
    exit 1
fi

# Verify deployment
log "Verifying deployment..."
if curl -f http://localhost/api/health > /dev/null 2>&1; then
    success "Deployment successful!"
    
    # Show container status
    log "Container status:"
    docker compose -f $COMPOSE_FILE ps
    
    # Show resource usage
    log "Resource usage:"
    docker stats --no-stream --format "table {{.Container}}\t{{.CPUPerc}}\t{{.MemUsage}}"
    
else
    error "Deployment verification failed!"
    log "Container logs:"
    docker compose -f $COMPOSE_FILE logs --tail=50
    exit 1
fi

# Cleanup
log "Cleaning up unused Docker resources..."
docker system prune -f --volumes || {
    warning "Failed to clean up Docker resources"
}

success "Deployment completed successfully!"
log "Application is available at: http://localhost/"
log "Health check endpoint: http://localhost/api/health"