"""
PyServe CLI State Management

Manages the state of running services.
"""

import json
import os
import time
from dataclasses import asdict, dataclass, field
from pathlib import Path
from typing import Any, Dict, Optional


@dataclass
class ServiceHealth:
    status: str = "unknown"  # healthy, unhealthy, degraded, unknown
    last_check: Optional[float] = None
    failures: int = 0
    response_time_ms: Optional[float] = None


@dataclass
class ServiceState:
    name: str
    state: str = "stopped"  # pending, starting, running, stopping, stopped, failed, restarting
    pid: Optional[int] = None
    port: int = 0
    workers: int = 0
    started_at: Optional[float] = None
    restart_count: int = 0
    health: ServiceHealth = field(default_factory=ServiceHealth)
    config_hash: str = ""

    @property
    def uptime(self) -> float:
        if self.started_at is None:
            return 0.0
        return time.time() - self.started_at

    def to_dict(self) -> Dict[str, Any]:
        return {
            "name": self.name,
            "state": self.state,
            "pid": self.pid,
            "port": self.port,
            "workers": self.workers,
            "started_at": self.started_at,
            "restart_count": self.restart_count,
            "health": asdict(self.health),
            "config_hash": self.config_hash,
        }

    @classmethod
    def from_dict(cls, data: Dict[str, Any]) -> "ServiceState":
        health_data = data.pop("health", {})
        health = ServiceHealth(**health_data) if health_data else ServiceHealth()
        return cls(**data, health=health)


@dataclass
class ProjectState:
    version: str = "1.0"
    project: str = ""
    config_file: str = ""
    config_hash: str = ""
    started_at: Optional[float] = None
    daemon_pid: Optional[int] = None
    services: Dict[str, ServiceState] = field(default_factory=dict)

    def to_dict(self) -> Dict[str, Any]:
        return {
            "version": self.version,
            "project": self.project,
            "config_file": self.config_file,
            "config_hash": self.config_hash,
            "started_at": self.started_at,
            "daemon_pid": self.daemon_pid,
            "services": {name: svc.to_dict() for name, svc in self.services.items()},
        }

    @classmethod
    def from_dict(cls, data: Dict[str, Any]) -> "ProjectState":
        services_data = data.pop("services", {})
        services = {name: ServiceState.from_dict(svc) for name, svc in services_data.items()}
        return cls(**data, services=services)


class StateManager:
    STATE_FILE = "state.json"
    PID_FILE = "pyserve.pid"
    SOCKET_FILE = "pyserve.sock"
    LOGS_DIR = "logs"

    def __init__(self, state_dir: Path, project: Optional[str] = None):
        self.state_dir = Path(state_dir)
        self.project = project or self._detect_project()
        self._state: Optional[ProjectState] = None

    def _detect_project(self) -> str:
        return Path.cwd().name

    @property
    def state_file(self) -> Path:
        return self.state_dir / self.STATE_FILE

    @property
    def pid_file(self) -> Path:
        return self.state_dir / self.PID_FILE

    @property
    def socket_file(self) -> Path:
        return self.state_dir / self.SOCKET_FILE

    @property
    def logs_dir(self) -> Path:
        return self.state_dir / self.LOGS_DIR

    def ensure_dirs(self) -> None:
        self.state_dir.mkdir(parents=True, exist_ok=True)
        self.logs_dir.mkdir(parents=True, exist_ok=True)

    def load(self) -> ProjectState:
        if self._state is not None:
            return self._state

        if self.state_file.exists():
            try:
                with open(self.state_file) as f:
                    data = json.load(f)
                self._state = ProjectState.from_dict(data)
            except (json.JSONDecodeError, KeyError):
                self._state = ProjectState(project=self.project)
        else:
            self._state = ProjectState(project=self.project)

        return self._state

    def save(self) -> None:
        if self._state is None:
            return

        self.ensure_dirs()

        with open(self.state_file, "w") as f:
            json.dump(self._state.to_dict(), f, indent=2)

    def get_state(self) -> ProjectState:
        return self.load()

    def update_service(self, name: str, **kwargs: Any) -> ServiceState:
        state = self.load()

        if name not in state.services:
            state.services[name] = ServiceState(name=name)

        service = state.services[name]
        for key, value in kwargs.items():
            if hasattr(service, key):
                setattr(service, key, value)

        self.save()
        return service

    def remove_service(self, name: str) -> None:
        state = self.load()
        if name in state.services:
            del state.services[name]
            self.save()

    def get_service(self, name: str) -> Optional[ServiceState]:
        state = self.load()
        return state.services.get(name)

    def get_all_services(self) -> Dict[str, ServiceState]:
        state = self.load()
        return state.services.copy()

    def clear(self) -> None:
        self._state = ProjectState(project=self.project)
        self.save()

    def is_daemon_running(self) -> bool:
        if not self.pid_file.exists():
            return False

        try:
            pid = int(self.pid_file.read_text().strip())
            # Check if process exists
            os.kill(pid, 0)
            return True
        except (ValueError, ProcessLookupError, PermissionError):
            return False

    def get_daemon_pid(self) -> Optional[int]:
        if not self.is_daemon_running():
            return None

        try:
            return int(self.pid_file.read_text().strip())
        except ValueError:
            return None

    def set_daemon_pid(self, pid: int) -> None:
        self.ensure_dirs()
        self.pid_file.write_text(str(pid))

        state = self.load()
        state.daemon_pid = pid
        self.save()

    def clear_daemon_pid(self) -> None:
        if self.pid_file.exists():
            self.pid_file.unlink()

        state = self.load()
        state.daemon_pid = None
        self.save()

    def get_service_log_file(self, service_name: str) -> Path:
        self.ensure_dirs()
        return self.logs_dir / f"{service_name}.log"

    def compute_config_hash(self, config_file: str) -> str:
        import hashlib

        path = Path(config_file)
        if not path.exists():
            return ""

        content = path.read_bytes()
        return hashlib.sha256(content).hexdigest()[:16]