"""
Dependency management
Handles package installation and verification
"""

import sys
import subprocess
import importlib.util
from config_settings import REQUIRED_PACKAGES, REPOSITORY_PATH


def install_package_from_wheel(wheel_path, package_name):
    """Install a Python package from a wheel file"""
    try:
        print(f"Installing {package_name} from {wheel_path}...")
        result = subprocess.run([
            sys.executable, "-m", "pip", "install", wheel_path,
            "--no-index", "--no-deps", "--break-system-packages",
            "--no-warn-script-location", "--force-reinstall"
        ], capture_output=True, text=True, timeout=60)
        
        if result.returncode == 0:
            print(f"✓ {package_name} installed successfully")
            return True
        else:
            print(f"✗ Failed to install {package_name}: {result.stderr}")
            return False
    except Exception as e:
        print(f"✗ Error installing {package_name}: {e}")
        return False


def check_and_install_dependencies():
    """Check if required packages are installed and install them from local repository if needed"""
    print("Checking and installing dependencies...")
    
    repository_path = str(REPOSITORY_PATH)
    missing_packages = []
    
    # Check each required package
    for package_name, wheel_file in REQUIRED_PACKAGES.items():
        try:
            spec = importlib.util.find_spec(package_name)
            if spec is not None:
                print(f"✓ {package_name} is already installed")
            else:
                raise ImportError(f"Package {package_name} not found")
                
        except ImportError:
            print(f"✗ {package_name} is not installed")
            missing_packages.append((package_name, wheel_file))
        except Exception as e:
            print(f"✗ Error checking {package_name}: {e}")
            missing_packages.append((package_name, wheel_file))
    
    # Install missing packages
    if missing_packages:
        print(f"\nInstalling {len(missing_packages)} missing packages...")
        
        for package_name, wheel_file in missing_packages:
            if wheel_file is None:
                # Try to install via pip from internet or system packages
                try:
                    print(f"Attempting to install {package_name} via pip...")
                    result = subprocess.run([
                        sys.executable, "-m", "pip", "install", package_name,
                        "--break-system-packages", "--no-warn-script-location"
                    ], capture_output=True, text=True, timeout=120)
                    
                    if result.returncode == 0:
                        print(f"✓ {package_name} installed via pip")
                    else:
                        print(f"✗ Could not install {package_name} via pip: {result.stderr}")
                        if package_name in ['flask', 'gpiozero']:
                            try:
                                print(f"Trying to install {package_name} via apt...")
                                result = subprocess.run([
                                    'sudo', 'apt', 'install', '-y', f'python3-{package_name}',
                                    '--no-install-recommends'
                                ], capture_output=True, text=True, timeout=120)
                                
                                if result.returncode == 0:
                                    print(f"✓ {package_name} installed via apt")
                                else:
                                    print(f"✗ Could not install {package_name} via apt")
                            except Exception as apt_e:
                                print(f"✗ apt install failed: {apt_e}")
                except Exception as pip_e:
                    print(f"✗ pip install failed: {pip_e}")
            else:
                # Try to install from wheel file
                wheel_path = f"{repository_path}/{wheel_file}"
                install_package_from_wheel(wheel_path, package_name)


def verify_dependencies():
    """Verify that all required dependencies are available"""
    print("Verifying dependencies...")
    available = True
    
    for package_name in REQUIRED_PACKAGES.keys():
        try:
            spec = importlib.util.find_spec(package_name)
            if spec is not None:
                print(f"✓ {package_name} verified")
            else:
                print(f"✗ {package_name} not available")
                available = False
        except Exception as e:
            print(f"✗ Error verifying {package_name}: {e}")
            available = False
    
    return available