"""
Services Data Collector

Collects system service information including running services,
their states, startup configuration, and dependencies.
"""

import json
import logging
import subprocess
from typing import Dict, Any, List

logger = logging.getLogger(__name__)

class ServicesCollector:
    """Collector for system service information."""

    def __init__(self):
        self.service_manager = "systemd"  # Default to systemd
        self.include_disabled = False

    def collect_services(self, system: str) -> Dict[str, Any]:
        """Collect service information from target system."""
        logger.info(f"Collecting services data from {system}")

        try:
            # Detect service manager
            service_manager = self.detect_service_manager(system)

            if service_manager == "systemd":
                services = self.collect_systemd_services(system)
            elif service_manager == "sysv":
                services = self.collect_sysv_services(system)
            else:
                raise RuntimeError(f"Unsupported service manager: {service_manager}")

            return {
                "service_manager": service_manager,
                "services": services,
                "timestamp": self.get_timestamp(system)
            }

        except Exception as e:
            logger.error(f"Failed to collect services from {system}: {e}")
            raise

    def detect_service_manager(self, system: str) -> str:
        """Detect which service manager is running on the system."""
        try:
            # Check for systemd
            result = subprocess.run(
                ["ssh", system, "ps -p 1 -o comm="],
                capture_output=True,
                text=True,
                timeout=10
            )

            if result.returncode == 0:
                if "systemd" in result.stdout.strip():
                    return "systemd"
                elif "init" in result.stdout.strip():
                    return "sysv"

            # Fallback check
            result = subprocess.run(
                ["ssh", system, "which systemctl"],
                capture_output=True,
                text=True,
                timeout=10
            )

            if result.returncode == 0:
                return "systemd"

            return "sysv"

        except Exception:
            return "unknown"

    def collect_systemd_services(self, system: str) -> List[Dict[str, Any]]:
        """Collect systemd service information."""
        services = []

        try:
            # Get all services
            result = subprocess.run(
                ["ssh", system, "systemctl list-units --type=service --all --no-pager --no-legend"],
                capture_output=True,
                text=True,
                timeout=30
            )

            if result.returncode != 0:
                raise RuntimeError(f"systemctl list-units failed: {result.stderr}")

            # Parse service list
            for line in result.stdout.strip().split('\n'):
                if not line.strip():
                    continue

                parts = line.split()
                if len(parts) >= 4:
                    service_name = parts[0]
                    load_state = parts[1]
                    active_state = parts[2]
                    sub_state = parts[3]

                    # Skip if disabled and not including disabled
                    if not self.include_disabled and load_state == "not-found":
                        continue

                    # Get detailed service info
                    service_info = self.get_systemd_service_details(system, service_name)

                    services.append({
                        "name": service_name,
                        "load_state": load_state,
                        "active_state": active_state,
                        "sub_state": sub_state,
                        **service_info
                    })

        except subprocess.TimeoutExpired:
            logger.error(f"Timeout collecting systemd services from {system}")
            raise
        except Exception as e:
            logger.error(f"Failed to collect systemd services from {system}: {e}")
            raise

        return services

    def get_systemd_service_details(self, system: str, service_name: str) -> Dict[str, Any]:
        """Get detailed information for a systemd service."""
        details = {}

        try:
            # Get service status
            result = subprocess.run(
                ["ssh", system, f"systemctl show {service_name} --no-pager"],
                capture_output=True,
                text=True,
                timeout=15
            )

            if result.returncode == 0:
                for line in result.stdout.strip().split('\n'):
                    if '=' in line:
                        key, value = line.split('=', 1)
                        details[key.lower()] = value

        except Exception as e:
            logger.warning(f"Failed to get details for {service_name}: {e}")

        return details

    def collect_sysv_services(self, system: str) -> List[Dict[str, Any]]:
        """Collect SysV init service information."""
        services = []

        try:
            # Get service list from /etc/init.d/
            result = subprocess.run(
                ["ssh", system, "ls -1 /etc/init.d/"],
                capture_output=True,
                text=True,
                timeout=15
            )

            if result.returncode != 0:
                raise RuntimeError(f"Failed to list init.d services: {result.stderr}")

            for service_name in result.stdout.strip().split('\n'):
                if not service_name.strip():
                    continue

                # Get service status
                status_result = subprocess.run(
                    ["ssh", system, f"/etc/init.d/{service_name} status"],
                    capture_output=True,
                    text=True,
                    timeout=10
                )

                status = "unknown"
                if status_result.returncode == 0:
                    status = "running"
                elif "not running" in status_result.stdout.lower():
                    status = "stopped"

                services.append({
                    "name": service_name,
                    "status": status,
                    "type": "sysv"
                })

        except Exception as e:
            logger.error(f"Failed to collect SysV services from {system}: {e}")
            raise

        return services

    def get_timestamp(self, system: str) -> str:
        """Get current timestamp from target system."""
        try:
            result = subprocess.run(
                ["ssh", system, "date -Iseconds"],
                capture_output=True,
                text=True,
                timeout=10
            )

            if result.returncode == 0:
                return result.stdout.strip()
            else:
                return "unknown"

        except Exception:
            return "unknown"

def collect(system: str) -> Dict[str, Any]:
    """Main collection function for services data."""
    collector = ServicesCollector()
    return collector.collect_services(system)