"""
Backend PDM pour GestVenv v1.1 - Implémentation future
"""

import logging
import re
import subprocess
import time
from datetime import datetime
from pathlib import Path
from typing import List, Optional

from .base import PackageBackend, BackendCapabilities
from ..core.models import PackageInfo, InstallResult

logger = logging.getLogger(__name__)


class PDMBackend(PackageBackend):
    """Backend PDM (implémentation préparatoire)"""
    
    def __init__(self):
        super().__init__()
        self._name = "pdm"
        
    def _init_capabilities(self) -> BackendCapabilities:
        """Initialise les capacités PDM"""
        return BackendCapabilities(
            supports_lock_files=True,
            supports_dependency_groups=True,
            supports_parallel_install=True,
            supports_editable_installs=True,
            supports_workspace=True,
            supports_pyproject_sync=True,
            supported_formats=["pyproject.toml", "pdm.lock"],
            max_parallel_jobs=4
        )
        
    def _check_availability(self) -> bool:
        """Vérifie la disponibilité de PDM"""
        try:
            result = subprocess.run(
                ["pdm", "--version"],
                capture_output=True,
                text=True,
                timeout=10
            )
            return result.returncode == 0
        except (subprocess.TimeoutExpired, FileNotFoundError):
            return False
            
    def _get_version(self) -> Optional[str]:
        """Récupère la version PDM"""
        try:
            result = subprocess.run(
                ["pdm", "--version"],
                capture_output=True,
                text=True,
                timeout=10
            )
            if result.returncode == 0:
                match = re.search(r'PDM.*?(\d+\.\d+\.\d+)', result.stdout)
                return match.group(1) if match else None
        except (subprocess.TimeoutExpired, FileNotFoundError):
            pass
        return None
        
    def create_environment(self, path: Path, python_version: str) -> bool:
        """Création avec PDM"""
        try:
            # Créer le projet PDM
            result = subprocess.run(
                ["pdm", "init", "--non-interactive", "--backend", "setuptools"],
                cwd=path.parent,
                capture_output=True,
                text=True,
                timeout=60
            )
            
            if result.returncode != 0:
                logger.error(f"Erreur init PDM: {result.stderr}")
                return False
            
            # Configurer Python version si spécifiée
            if python_version:
                result = subprocess.run(
                    ["pdm", "use", python_version],
                    cwd=path.parent,
                    capture_output=True,
                    text=True,
                    timeout=30
                )
                
                if result.returncode != 0:
                    logger.warning(f"Impossible de configurer Python {python_version}")
            
            return True
            
        except Exception as e:
            logger.error(f"Erreur création environnement PDM: {e}")
            return False
        
    def install_package(self, env_path: Path, package: str, **kwargs) -> InstallResult:
        """Installation avec PDM"""
        start_time = time.time()
        
        try:
            cmd = ["pdm", "add", package]
            
            # Options d'installation
            if kwargs.get('editable'):
                cmd.append("--editable")
            
            if kwargs.get('group'):
                cmd.extend(["--group", kwargs['group']])
            
            # Exécution
            result = subprocess.run(
                cmd,
                cwd=env_path.parent,
                capture_output=True,
                text=True,
                timeout=600
            )
            
            if result.returncode == 0:
                return InstallResult(
                    success=True,
                    message=f"Package {package} installé avec PDM",
                    packages_installed=[package],
                    backend_used="pdm",
                    execution_time=time.time() - start_time
                )
            else:
                return InstallResult(
                    success=False,
                    message=f"Erreur installation PDM: {result.stderr}",
                    packages_failed=[package],
                    backend_used="pdm",
                    execution_time=time.time() - start_time
                )
            
        except Exception as e:
            return InstallResult(
                success=False,
                message=f"Erreur PDM: {e}",
                backend_used="pdm",
                execution_time=time.time() - start_time
            )
            
    def uninstall_package(self, env_path: Path, package: str) -> bool:
        """Désinstalle un package"""
        logger.warning("PDM backend: uninstall_package pas encore implémenté")
        return False
        
    def update_package(self, env_path: Path, package: str) -> bool:
        """Met à jour un package"""
        logger.warning("PDM backend: update_package pas encore implémenté")
        return False
        
    def list_packages(self, env_path: Path) -> List[PackageInfo]:
        """Liste les packages installés"""
        logger.warning("PDM backend: list_packages pas encore implémenté")
        return []
        
    def sync_pdm_project(self, env_path: Path) -> bool:
        """Synchronise un projet PDM (futur)"""
        try:
            result = subprocess.run(
                ["pdm", "sync"],
                cwd=env_path.parent,
                capture_output=True,
                text=True,
                timeout=300
            )
            
            return result.returncode == 0
            
        except Exception as e:
            logger.error(f"Erreur sync PDM: {e}")
            return False
            
    def manage_pdm_groups(self, env_path: Path, groups: List[str]) -> bool:
        """Gestion des groupes PDM (futur)"""
        try:
            if not groups:
                return True
                
            cmd = ["pdm", "sync"]
            for group in groups:
                cmd.extend(["--group", group])
                
            result = subprocess.run(
                cmd,
                cwd=env_path.parent,
                capture_output=True,
                text=True,
                timeout=300
            )
            
            return result.returncode == 0
            
        except Exception as e:
            logger.error(f"Erreur gestion groupes PDM: {e}")
            return False
            
    def get_performance_score(self) -> int:
        """Score de performance PDM"""
        return 8  # Très performant, proche d'uv