"""
Samba and NFS Shares Management
Handles /etc/samba/smb.conf and /etc/exports
"""

import re
import subprocess
import logging
from pathlib import Path
from typing import List, Dict, Any, Optional

logger = logging.getLogger(__name__)

SAMBA_CONFIG = Path("/etc/samba/smb.conf")
NFS_EXPORTS = Path("/etc/exports")


class SharesManager:
    """Manage Samba and NFS shares"""

    def list_samba_shares(self) -> List[Dict[str, Any]]:
        """Parse /etc/samba/smb.conf and return shares"""
        if not SAMBA_CONFIG.exists():
            return []

        shares = []
        try:
            with open(SAMBA_CONFIG, 'r') as f:
                content = f.read()

            current_share = None
            for line in content.split('\n'):
                line = line.strip()
                if not line or line.startswith('#') or line.startswith(';'):
                    continue

                if line.startswith('[') and line.endswith(']'):
                    current_share = line[1:-1]
                    if current_share.lower() != 'global':
                        shares.append({'name': current_share, 'path': None, 'comment': None})
                    else:
                        current_share = None
                    continue

                if '=' in line and current_share:
                    key, value = line.split('=', 1)
                    key = key.strip().lower()
                    value = value.strip()
                    if key == 'path':
                        shares[-1]['path'] = value
                    elif key == 'comment':
                        shares[-1]['comment'] = value

            return [s for s in shares if s['path']]

        except Exception as e:
            logger.error(f"Error parsing Samba config: {e}")
            return []

    def create_samba_share(self, name: str, path: str, comment: Optional[str] = None) -> bool:
        """Add Samba share to /etc/samba/smb.conf"""
        if not SAMBA_CONFIG.exists() or not name.strip() or not path.strip():
            return False

        try:
            name = name.strip()
            path = path.strip()
            section = f"\n[{name}]\n  path = {path}\n"
            if comment:
                section += f"  comment = {comment}\n"
            section += f"  browseable = yes\n  read only = no\n"

            with open(SAMBA_CONFIG, 'a') as f:
                f.write(section)

            subprocess.run(['/usr/bin/smbcontrol', 'smbd', 'reload-config'], capture_output=True, timeout=10)
            logger.info(f"Samba share created: {name}")
            return True
        except Exception as e:
            logger.error(f"Error creating Samba share: {e}")
            return False

    def update_samba_share(self, old_name: str, new_name: str, path: str, comment: Optional[str] = None) -> bool:
        """Update Samba share in /etc/samba/smb.conf"""
        if not SAMBA_CONFIG.exists():
            return False

        try:
            with open(SAMBA_CONFIG, 'r') as f:
                content = f.read()

            # Find and replace the share section
            pattern = rf"\n\[{re.escape(old_name)}\].*?(?=\n\[|\Z)"
            match = re.search(pattern, content, flags=re.DOTALL)

            if not match:
                return False

            # Build new section
            section = f"\n[{new_name}]\n  path = {path}\n"
            if comment:
                section += f"  comment = {comment}\n"
            section += f"  browseable = yes\n  read only = no\n"

            new_content = re.sub(pattern, section, content, flags=re.DOTALL)

            with open(SAMBA_CONFIG, 'w') as f:
                f.write(new_content)

            subprocess.run(['/usr/bin/smbcontrol', 'smbd', 'reload-config'], capture_output=True, timeout=10)
            logger.info(f"Samba share updated: {old_name} → {new_name}")
            return True
        except Exception as e:
            logger.error(f"Error updating Samba share: {e}")
            return False

    def delete_samba_share(self, name: str) -> bool:
        """Remove Samba share from /etc/samba/smb.conf"""
        if not SAMBA_CONFIG.exists():
            return False

        try:
            with open(SAMBA_CONFIG, 'r') as f:
                content = f.read()

            pattern = rf"\n\[{re.escape(name)}\].*?(?=\n\[|\Z)"
            new_content = re.sub(pattern, '', content, flags=re.DOTALL)

            if new_content == content:
                return False

            with open(SAMBA_CONFIG, 'w') as f:
                f.write(new_content)

            subprocess.run(['/usr/bin/smbcontrol', 'smbd', 'reload-config'], capture_output=True, timeout=10)
            logger.info(f"Samba share deleted: {name}")
            return True
        except Exception as e:
            logger.error(f"Error deleting Samba share: {e}")
            return False

    def list_nfs_shares(self) -> List[Dict[str, Any]]:
        """Parse /etc/exports and return NFS shares"""
        if not NFS_EXPORTS.exists():
            return []

        shares = []
        try:
            with open(NFS_EXPORTS, 'r') as f:
                for line in f:
                    line = line.strip()
                    if not line or line.startswith('#'):
                        continue

                    parts = line.split()
                    if len(parts) >= 2:
                        path = parts[0]
                        rest = ' '.join(parts[1:])
                        clients = rest[:rest.index('(')].strip() if '(' in rest else rest
                        options = rest[rest.index('(') + 1:rest.index(')')] if '(' in rest else None

                        shares.append({'path': path, 'clients': clients, 'options': options})

            return shares
        except Exception as e:
            logger.error(f"Error parsing NFS exports: {e}")
            return []

    def create_nfs_share(self, path: str, clients: str, options: Optional[str] = None) -> bool:
        """Add NFS share to /etc/exports"""
        if not NFS_EXPORTS.exists() or not path.strip() or not clients.strip():
            return False

        try:
            path = path.strip()
            clients = clients.strip()
            if not options:
                options = "rw,sync,no_subtree_check"

            export_line = f"{path} {clients}({options})\n"

            with open(NFS_EXPORTS, 'a') as f:
                f.write(export_line)

            subprocess.run(['/usr/sbin/exportfs', '-r'], capture_output=True, timeout=10)
            logger.info(f"NFS share created: {path}")
            return True
        except Exception as e:
            logger.error(f"Error creating NFS share: {e}")
            return False

    def delete_nfs_share(self, path: str) -> bool:
        """Remove NFS share from /etc/exports"""
        if not NFS_EXPORTS.exists():
            return False

        try:
            with open(NFS_EXPORTS, 'r') as f:
                lines = f.readlines()

            new_lines = [l for l in lines if not l.strip().startswith(path)]

            if len(new_lines) == len(lines):
                return False

            with open(NFS_EXPORTS, 'w') as f:
                f.writelines(new_lines)

            subprocess.run(['/usr/sbin/exportfs', '-r'], capture_output=True, timeout=10)
            logger.info(f"NFS share deleted: {path}")
            return True
        except Exception as e:
            logger.error(f"Error deleting NFS share: {e}")
            return False

    def get_samba_global_config(self) -> Dict[str, Any]:
        """Read Samba global configuration from registry using 'net conf list'"""
        try:
            result = subprocess.run(
                ['/usr/bin/net', 'conf', 'list'],
                capture_output=True,
                text=True,
                timeout=10
            )

            if result.returncode != 0:
                return {"parameters": []}

            parameters = []
            in_global = False
            for line in result.stdout.split('\n'):
                if line.strip().startswith('[global]'):
                    in_global = True
                    continue
                if in_global:
                    if line.strip().startswith('['):
                        break
                    line = line.strip()
                    if not line or line.startswith(';') or line.startswith('#'):
                        continue
                    if '=' in line:
                        key, value = line.split('=', 1)
                        parameters.append({
                            "key": key.strip(),
                            "value": value.strip()
                        })

            return {"parameters": parameters}
        except Exception as e:
            logger.error(f"Error reading Samba registry config: {e}")
            return {"parameters": []}

    def set_samba_global_config(self, parameters: Dict[str, str]) -> bool:
        """Update Samba global configuration parameters using 'net conf setparm'"""
        try:
            for key, value in parameters.items():
                result = subprocess.run(
                    ['/usr/bin/net', 'conf', 'setparm', 'global', key, '--', value],
                    capture_output=True,
                    text=True,
                    timeout=10
                )
                if result.returncode != 0:
                    logger.error(f"Failed to set {key}={value}: {result.stderr}")
                    return False

            logger.info(f"Samba global config updated: {len(parameters)} parameters")
            return True
        except Exception as e:
            logger.error(f"Error writing Samba global config: {e}")
            return False

    def import_samba_config(self, config_file: str) -> bool:
        """Import Samba configuration using net conf import"""
        try:
            # Use net conf import to load configuration from file
            result = subprocess.run(
                ['net', 'conf', 'import', config_file],
                capture_output=True,
                timeout=10
            )
            if result.returncode == 0:
                logger.info(f"Samba config imported from {config_file}")
                return True
            else:
                logger.error(f"Failed to import Samba config: {result.stderr.decode()}")
                return False
        except Exception as e:
            logger.error(f"Error importing Samba config: {e}")
            return False

    def get_nfs_config(self) -> Dict[str, Any]:
        """Read /etc/exports and return as config object"""
        if not NFS_EXPORTS.exists():
            return {"exports": "", "note": "NFS not configured"}

        try:
            with open(NFS_EXPORTS, 'r') as f:
                content = f.read()
            return {"exports": content, "path": str(NFS_EXPORTS)}
        except Exception as e:
            logger.error(f"Error reading NFS config: {e}")
            return {"error": str(e), "path": str(NFS_EXPORTS)}

    def set_nfs_config(self, content: str) -> bool:
        """Write to /etc/exports and reload NFS"""
        if not NFS_EXPORTS.exists():
            return False

        try:
            with open(NFS_EXPORTS, 'w') as f:
                f.write(content)

            subprocess.run(['/usr/sbin/exportfs', '-r'], capture_output=True, timeout=10)
            logger.info("NFS config updated")
            return True
        except Exception as e:
            logger.error(f"Error writing NFS config: {e}")
            return False


share_manager = SharesManager()