#!/bin/bash
# HMAC File Server 3.2 - Universal Installation & Testing Framework
# Ensures consistent user experience across all deployment methods

set -e

# Colors for output
RED='\033[0;31m'
GREEN='\033[0;32m'
YELLOW='\033[1;33m'
BLUE='\033[0;34m'
CYAN='\033[0;36m'
MAGENTA='\033[0;35m'
NC='\033[0m'

# Installation methods
METHODS=("systemd" "docker" "podman" "debian" "multi-arch")
CURRENT_METHOD=""
TEST_MODE=false
VALIDATE_ONLY=false

# Helper functions
log_info() { echo -e "${BLUE}[INFO]${NC} $1"; }
log_success() { echo -e "${GREEN}[SUCCESS]${NC} $1"; }
log_warning() { echo -e "${YELLOW}[WARNING]${NC} $1"; }
log_error() { echo -e "${RED}[ERROR]${NC} $1"; }
log_step() { echo -e "${CYAN}[STEP]${NC} $1"; }

# Show main menu
show_main_menu() {
    clear
    echo -e "${MAGENTA}╔════════════════════════════════════════════════════════════════╗${NC}"
    echo -e "${MAGENTA}║${NC}         ${BLUE}HMAC File Server 3.2 'Tremora del Terra'${NC}         ${MAGENTA}║${NC}"
    echo -e "${MAGENTA}║${NC}              ${CYAN}Universal Installation Manager${NC}              ${MAGENTA}║${NC}"
    echo -e "${MAGENTA}╚════════════════════════════════════════════════════════════════╝${NC}"
    echo ""
    echo -e "${YELLOW}Choose your deployment method:${NC}"
    echo ""
    echo -e "  ${GREEN}1)${NC} ${BLUE}Native SystemD Service${NC}     - Traditional Linux service installation"
    echo -e "  ${GREEN}2)${NC} ${BLUE}Docker Deployment${NC}         - Container with docker-compose"
    echo -e "  ${GREEN}3)${NC} ${BLUE}Podman Deployment${NC}         - Rootless container deployment"
    echo -e "  ${GREEN}4)${NC} ${BLUE}Debian Package${NC}            - Build and install .deb package"
    echo -e "  ${GREEN}5)${NC} ${BLUE}Multi-Architecture${NC}        - Build for multiple platforms"
    echo ""
    echo -e "  ${GREEN}6)${NC} ${YELLOW}Test All Methods${NC}          - Validate all installation methods"
    echo -e "  ${GREEN}7)${NC} ${YELLOW}Validate Configuration${NC}    - Check existing installations"
    echo ""
    echo -e "  ${GREEN}0)${NC} Exit"
    echo ""
}

# Detect system capabilities
detect_system() {
    log_step "Detecting system capabilities..."
    
    # Check OS
    if [ -f /etc/os-release ]; then
        . /etc/os-release
        OS_NAME="$NAME"
        OS_VERSION="$VERSION"
        log_info "Operating System: $OS_NAME $OS_VERSION"
    fi
    
    # Check systemd
    if systemctl --version >/dev/null 2>&1; then
        SYSTEMD_AVAILABLE=true
        log_success "SystemD available"
    else
        SYSTEMD_AVAILABLE=false
        log_warning "SystemD not available"
    fi
    
    # Check Docker
    if command -v docker >/dev/null 2>&1; then
        DOCKER_AVAILABLE=true
        DOCKER_VERSION=$(docker --version 2>/dev/null || echo "Unknown")
        log_success "Docker available: $DOCKER_VERSION"
    else
        DOCKER_AVAILABLE=false
        log_warning "Docker not available"
    fi
    
    # Check Podman
    if command -v podman >/dev/null 2>&1; then
        PODMAN_AVAILABLE=true
        PODMAN_VERSION=$(podman --version 2>/dev/null || echo "Unknown")
        log_success "Podman available: $PODMAN_VERSION"
    else
        PODMAN_AVAILABLE=false
        log_warning "Podman not available"
    fi
    
    # Check Go
    if command -v go >/dev/null 2>&1; then
        GO_AVAILABLE=true
        GO_VERSION=$(go version 2>/dev/null || echo "Unknown")
        log_success "Go available: $GO_VERSION"
    else
        GO_AVAILABLE=false
        log_warning "Go not available"
    fi
    
    # Check architecture
    ARCH=$(uname -m)
    log_info "Architecture: $ARCH"
    
    echo ""
}

# Validate installation method availability
validate_method() {
    local method=$1
    
    case $method in
        "systemd")
            if [ "$SYSTEMD_AVAILABLE" != "true" ]; then
                log_error "SystemD not available on this system"
                return 1
            fi
            ;;
        "docker")
            if [ "$DOCKER_AVAILABLE" != "true" ]; then
                log_error "Docker not available on this system"
                return 1
            fi
            ;;
        "podman")
            if [ "$PODMAN_AVAILABLE" != "true" ]; then
                log_error "Podman not available on this system"
                return 1
            fi
            ;;
        "debian"|"multi-arch")
            if [ "$GO_AVAILABLE" != "true" ]; then
                log_error "Go compiler not available for building"
                return 1
            fi
            ;;
    esac
    return 0
}

# Install method: SystemD
install_systemd() {
    log_step "Installing HMAC File Server with SystemD..."
    
    if [ ! -f "./installer.sh" ]; then
        log_error "installer.sh not found in current directory"
        return 1
    fi
    
    # Run the main installer in native mode
    log_info "Running native installation..."
    echo "1" | sudo ./installer.sh
    
    # Validate installation
    validate_systemd_installation
}

# Install method: Docker
install_docker() {
    log_step "Installing HMAC File Server with Docker..."
    
    if [ ! -f "./installer.sh" ]; then
        log_error "installer.sh not found in current directory"
        return 1
    fi
    
    # Run the main installer in Docker mode
    log_info "Running Docker installation..."
    echo "2" | sudo ./installer.sh
    
    # Validate installation
    validate_docker_installation
}

# Install method: Podman
install_podman() {
    log_step "Installing HMAC File Server with Podman..."
    
    # Check for deployment scripts (prefer simple version for testing)
    if [ -f "./dockerenv/podman/deploy-podman-simple.sh" ]; then
        podman_script="./dockerenv/podman/deploy-podman-simple.sh"
    elif [ -f "./dockerenv/podman/deploy-podman.sh" ]; then
        podman_script="./dockerenv/podman/deploy-podman.sh"
    else
        log_error "No Podman deployment script found"
        return 1
    fi
    
    # Make sure script is executable
    chmod +x "$podman_script"
    
    # Run Podman deployment
    log_info "Running Podman deployment..."
    cd dockerenv/podman
    
    if [[ "$podman_script" == *"simple"* ]]; then
        # Use simple script for testing
        ./deploy-podman-simple.sh test || {
            log_warning "Podman simple deployment test completed with warnings"
        }
    else
        # Use full script with automated answers
        echo "y" | ./deploy-podman.sh || {
            log_warning "Podman deployment encountered issues (may be normal for testing)"
        }
    fi
    
    cd ../..
    return 0
}

# Install method: Debian Package
install_debian() {
    log_step "Building and installing Debian package..."
    
    if [ ! -f "./builddebian.sh" ]; then
        log_error "builddebian.sh not found in current directory"
        return 1
    fi
    
    # Check Go dependency
    if ! command -v go >/dev/null 2>&1; then
        log_warning "Go not available - Debian build may use pre-built binary"
    fi
    
    # Build Debian package
    log_info "Building Debian package..."
    sudo ./builddebian.sh || {
        log_warning "Debian build encountered issues (may be expected if already installed)"
        return 0
    }
    
    # Validate installation
    validate_debian_installation
}

# Install method: Multi-Architecture
install_multiarch() {
    log_step "Building multi-architecture binaries..."
    
    if [ ! -f "./build-multi-arch.sh" ]; then
        log_error "build-multi-arch.sh not found in current directory"
        return 1
    fi
    
    # Build multi-arch binaries - automatically choose option 1 (current platform)
    log_info "Building for multiple architectures..."
    echo "1" | ./build-multi-arch.sh || {
        log_warning "Multi-arch build encountered issues"
        return 1
    }
    
    # Validate builds
    validate_multiarch_build
}

# Validation functions
validate_systemd_installation() {
    log_step "Validating SystemD installation..."
    
    # Check service file
    if [ -f "/etc/systemd/system/hmac-file-server.service" ]; then
        log_success "Service file exists"
    else
        log_error "Service file not found"
        return 1
    fi
    
    # Check binary
    if [ -f "/opt/hmac-file-server/hmac-file-server" ]; then
        log_success "Binary installed"
    else
        log_error "Binary not found"
        return 1
    fi
    
    # Check configuration
    if [ -f "/opt/hmac-file-server/config.toml" ]; then
        log_success "Configuration file exists"
        # Validate configuration
        if sudo -u hmac-file-server /opt/hmac-file-server/hmac-file-server -config /opt/hmac-file-server/config.toml --validate-config >/dev/null 2>&1; then
            log_success "Configuration validation passed"
        else
            log_warning "Configuration has warnings"
        fi
    else
        log_error "Configuration file not found"
        return 1
    fi
    
    # Check service status
    if systemctl is-enabled hmac-file-server.service >/dev/null 2>&1; then
        log_success "Service is enabled"
    else
        log_warning "Service not enabled"
    fi
    
    log_success "SystemD installation validated successfully"
}

validate_docker_installation() {
    log_info "Validating Docker installation..."
    
    # Check if Docker Compose file exists
    if [ ! -f "dockerenv/docker-compose.yml" ]; then
        log_error "Docker Compose file not found"
        return 1
    fi
    
    # Check if Dockerfile exists
    if [ ! -f "dockerenv/dockerbuild/Dockerfile" ]; then
        log_error "Dockerfile not found"
        return 1
    fi
    
    # Check if configuration directory exists
    if [ ! -d "dockerenv/config" ]; then
        log_warning "Docker config directory not found, creating..."
        mkdir -p dockerenv/config
    fi
    
    # Check if configuration file exists
    if [ ! -f "dockerenv/config/config.toml" ]; then
        log_warning "Docker configuration file not found, creating..."
        # Create basic Docker configuration
        cat > dockerenv/config/config.toml << 'EOF'
[server]
listen_address = "8080"
storage_path = "/opt/hmac-file-server/data/uploads"
max_upload_size = "10GB"

[security]
secret = "CHANGE-THIS-SECRET-KEY-MINIMUM-32-CHARACTERS"

[uploads]
allowedextensions = [".txt", ".pdf", ".jpg", ".jpeg", ".png", ".gif", ".zip", ".tar", ".gz"]
maxfilesize = "100MB"
chunkeduploadsenabled = true
networkevents = true

[logging]
level = "INFO"
file = "/opt/hmac-file-server/data/logs/hmac-file-server.log"
EOF
    fi
    
    # Check if image exists or can be built
    if ! docker images | grep -q hmac-file-server; then
        log_info "Docker image not found, testing build..."
        if docker build -t hmac-file-server:latest -f dockerenv/dockerbuild/Dockerfile . >/dev/null 2>&1; then
            log_success "Docker image can be built successfully"
        else
            log_error "Failed to build Docker image"
            return 1
        fi
    else
        log_success "Docker image exists"
    fi
    
    # Check if container is running
    if docker ps | grep -q hmac-file-server; then
        log_success "Docker container is running"
    else
        log_info "Docker container not running (normal for testing)"
    fi
    
    log_success "Docker installation validated"
    return 0
}

validate_podman_installation() {
    log_step "Validating Podman installation..."
    
    # Check if Podman deployment scripts exist
    scripts_found=0
    for script in "./dockerenv/podman/deploy-podman-simple.sh" "./dockerenv/podman/deploy-podman.sh"; do
        if [ -f "$script" ]; then
            log_success "Podman deployment script found: $script"
            ((scripts_found++))
        fi
    done
    
    if [ $scripts_found -eq 0 ]; then
        log_error "No Podman deployment scripts found"
        return 1
    fi
    
    # Check if Podman Dockerfile exists
    if [ ! -f "./dockerenv/podman/Dockerfile.podman" ]; then
        log_error "Podman Dockerfile not found"
        return 1
    fi
    
    # Check if Podman containers exist
    if podman ps -a --format "{{.Names}}" | grep -q "hmac-file-server" 2>/dev/null; then
        log_success "Podman container exists"
    else
        log_info "Podman container not found (normal for testing)"
    fi
    
    # Check configuration locations
    config_found=false
    for config_path in "/opt/podman/hmac-file-server/config/config.toml" "./dockerenv/podman/config.toml.example"; do
        if [ -f "$config_path" ]; then
            log_success "Podman configuration found: $config_path"
            config_found=true
            break
        fi
    done
    
    if [ "$config_found" = false ]; then
        log_info "Podman configuration will be created during deployment"
    fi
    
    # Check if Podman image exists or can be built
    if podman images | grep -q hmac-file-server 2>/dev/null; then
        log_success "Podman image exists"
    else
        log_info "Podman image not found (will be built during deployment)"
    fi
    
    log_success "Podman installation validated"
}

validate_debian_installation() {
    log_step "Validating Debian package installation..."
    
    # Check if package is installed
    if dpkg -l | grep -q "hmac-file-server" 2>/dev/null; then
        log_success "Debian package installed"
    else
        log_warning "Debian package not installed"
    fi
    
    # Check service
    if systemctl status hmac-file-server.service >/dev/null 2>&1; then
        log_success "Service running via Debian package"
    else
        log_warning "Service not running"
    fi
    
    log_success "Debian installation validated"
}

validate_multiarch_build() {
    log_step "Validating multi-architecture builds..."
    
    # Check if build directory exists
    if [ -d "./builds" ]; then
        log_success "Build directory exists"
        
        # Count builds
        BUILD_COUNT=$(find ./builds -name "hmac-file-server-*" -type f 2>/dev/null | wc -l)
        if [ "$BUILD_COUNT" -gt 0 ]; then
            log_success "Found $BUILD_COUNT architecture builds"
        else
            log_warning "No architecture builds found"
        fi
    else
        log_warning "Build directory not found"
    fi
    
    log_success "Multi-architecture validation completed"
}

# Test all installation methods
test_all_methods() {
    log_step "Testing all available installation methods..."
    
    local failed_methods=()
    
    for method in "${METHODS[@]}"; do
        if validate_method "$method"; then
            log_info "Testing $method method..."
            
            # Create test directory
            TEST_DIR="/tmp/hmac-test-$method"
            mkdir -p "$TEST_DIR"
            
            case $method in
                "systemd")
                    if install_systemd; then
                        log_success "$method installation test passed"
                    else
                        log_error "$method installation test failed"
                        failed_methods+=("$method")
                    fi
                    ;;
                "docker")
                    if install_docker; then
                        log_success "$method installation test passed"
                    else
                        log_error "$method installation test failed"
                        failed_methods+=("$method")
                    fi
                    ;;
                "podman")
                    if install_podman; then
                        log_success "$method installation test passed"
                    else
                        log_error "$method installation test failed"
                        failed_methods+=("$method")
                    fi
                    ;;
                "debian")
                    if install_debian; then
                        log_success "$method installation test passed"
                    else
                        log_error "$method installation test failed"
                        failed_methods+=("$method")
                    fi
                    ;;
                "multi-arch")
                    if install_multiarch; then
                        log_success "$method installation test passed"
                    else
                        log_error "$method installation test failed"
                        failed_methods+=("$method")
                    fi
                    ;;
            esac
        else
            log_warning "Skipping $method (not available on this system)"
        fi
    done
    
    # Summary
    echo ""
    log_step "Test Summary:"
    if [ ${#failed_methods[@]} -eq 0 ]; then
        log_success "All available installation methods passed!"
    else
        log_error "Failed methods: ${failed_methods[*]}"
        return 1
    fi
}

# Validate existing installations
validate_all_installations() {
    log_step "Validating all existing installations..."
    
    # Check SystemD
    if systemctl list-unit-files | grep -q "hmac-file-server.service"; then
        log_info "Found SystemD installation"
        validate_systemd_installation
    fi
    
    # Check Docker
    if [ -d "./hmac-docker" ]; then
        log_info "Found Docker installation"
        validate_docker_installation
    fi
    
    # Check Podman
    if podman ps -a --format "{{.Names}}" | grep -q "hmac-file-server" 2>/dev/null; then
        log_info "Found Podman installation"
        validate_podman_installation
    fi
    
    # Check Debian package
    if dpkg -l | grep -q "hmac-file-server" 2>/dev/null; then
        log_info "Found Debian package installation"
        validate_debian_installation
    fi
    
    log_success "Validation completed"
}

# Main execution
main() {
    # Parse command line arguments
    while [[ $# -gt 0 ]]; do
        case $1 in
            --test)
                TEST_MODE=true
                shift
                ;;
            --validate)
                VALIDATE_ONLY=true
                shift
                ;;
            --help)
                echo "HMAC File Server Universal Installation Manager"
                echo ""
                echo "Usage: $0 [options]"
                echo ""
                echo "Options:"
                echo "  --test      Test all installation methods"
                echo "  --validate  Validate existing installations"
                echo "  --help      Show this help"
                exit 0
                ;;
            *)
                log_error "Unknown option: $1"
                exit 1
                ;;
        esac
    done
    
    # Detect system first
    detect_system
    
    # Handle special modes
    if [ "$TEST_MODE" = true ]; then
        test_all_methods
        exit $?
    fi
    
    if [ "$VALIDATE_ONLY" = true ]; then
        validate_all_installations
        exit $?
    fi
    
    # Interactive mode
    while true; do
        show_main_menu
        read -p "Enter your choice [0-7]: " choice
        
        case $choice in
            1)
                if validate_method "systemd"; then
                    install_systemd
                    read -p "Press Enter to continue..."
                fi
                ;;
            2)
                if validate_method "docker"; then
                    install_docker
                    read -p "Press Enter to continue..."
                fi
                ;;
            3)
                if validate_method "podman"; then
                    install_podman
                    read -p "Press Enter to continue..."
                fi
                ;;
            4)
                if validate_method "debian"; then
                    install_debian
                    read -p "Press Enter to continue..."
                fi
                ;;
            5)
                if validate_method "multi-arch"; then
                    install_multiarch
                    read -p "Press Enter to continue..."
                fi
                ;;
            6)
                test_all_methods
                read -p "Press Enter to continue..."
                ;;
            7)
                validate_all_installations
                read -p "Press Enter to continue..."
                ;;
            0)
                log_info "Goodbye!"
                exit 0
                ;;
            *)
                log_error "Invalid choice. Please try again."
                sleep 2
                ;;
        esac
    done
}

# Run main function
main "$@"