"""
Configuration management for GSPro Remote.
"""

import json
import logging
from pathlib import Path
from typing import Optional
from functools import lru_cache

from pydantic import BaseModel, Field
from pydantic_settings import BaseSettings

logger = logging.getLogger(__name__)


class ServerConfig(BaseModel):
    """Server configuration settings."""

    host: str = Field("0.0.0.0", description="Server host address")
    port: int = Field(5005, description="Server port")
    mdns_enabled: bool = Field(True, description="Enable mDNS service discovery")


class CaptureConfig(BaseModel):
    """Screen capture configuration settings."""

    fps: int = Field(30, description="Frames per second for streaming")
    quality: int = Field(85, description="JPEG quality (0-100)")
    resolution: str = Field("720p", description="Stream resolution")
    region_x: int = Field(0, description="Map region X coordinate")
    region_y: int = Field(0, description="Map region Y coordinate")
    region_width: int = Field(640, description="Map region width")
    region_height: int = Field(480, description="Map region height")


class GSProConfig(BaseModel):
    """GSPro application configuration settings."""

    window_title: str = Field("GSPro", description="GSPro window title")
    auto_focus: bool = Field(True, description="Auto-focus GSPro window before sending keys")
    key_delay: float = Field(0.05, description="Default delay between key presses (seconds)")


class VisionConfig(BaseModel):
    """Computer vision configuration settings (for V2 features)."""

    enabled: bool = Field(False, description="Enable vision features")
    ocr_engine: str = Field("easyocr", description="OCR engine to use (easyocr or tesseract)")
    confidence_threshold: float = Field(0.7, description="Minimum confidence for OCR detection")


class AppConfig(BaseSettings):
    """Main application configuration."""

    server: ServerConfig = Field(default_factory=ServerConfig)
    capture: CaptureConfig = Field(default_factory=CaptureConfig)
    gspro: GSProConfig = Field(default_factory=GSProConfig)
    vision: VisionConfig = Field(default_factory=VisionConfig)

    config_path: Optional[Path] = None
    debug: bool = Field(False, description="Enable debug mode")

    class Config:
        env_prefix = "GSPRO_REMOTE_"
        env_nested_delimiter = "__"
        case_sensitive = False

    def __init__(self, **kwargs):
        super().__init__(**kwargs)
        if self.config_path is None:
            self.config_path = self._get_default_config_path()
        self.load()

    @staticmethod
    def _get_default_config_path() -> Path:
        """Get the default configuration file path."""
        import os

        if os.name == "nt":  # Windows
            base_path = Path(os.environ.get("LOCALAPPDATA", ""))
            if not base_path:
                base_path = Path.home() / "AppData" / "Local"
        else:  # Unix-like
            base_path = Path.home() / ".config"

        config_dir = base_path / "GSPro Remote"
        config_dir.mkdir(parents=True, exist_ok=True)
        return config_dir / "config.json"

    def load(self) -> None:
        """Load configuration from file."""
        if self.config_path and self.config_path.exists():
            try:
                with open(self.config_path, "r") as f:
                    data = json.load(f)

                # Update configuration with loaded data
                if "server" in data:
                    self.server = ServerConfig(**data["server"])
                if "capture" in data:
                    self.capture = CaptureConfig(**data["capture"])
                if "gspro" in data:
                    self.gspro = GSProConfig(**data["gspro"])
                if "vision" in data:
                    self.vision = VisionConfig(**data["vision"])
                if "debug" in data:
                    self.debug = data["debug"]

                logger.info(f"Configuration loaded from {self.config_path}")
            except Exception as e:
                logger.warning(f"Failed to load configuration: {e}")
                self.save()  # Save default configuration
        else:
            # Create default configuration file
            self.save()
            logger.info(f"Created default configuration at {self.config_path}")

    def save(self) -> None:
        """Save configuration to file."""
        if self.config_path:
            try:
                self.config_path.parent.mkdir(parents=True, exist_ok=True)

                data = {
                    "server": self.server.model_dump(),
                    "capture": self.capture.model_dump(),
                    "gspro": self.gspro.model_dump(),
                    "vision": self.vision.model_dump(),
                    "debug": self.debug,
                }

                with open(self.config_path, "w") as f:
                    json.dump(data, f, indent=2)

                logger.info(f"Configuration saved to {self.config_path}")
            except Exception as e:
                logger.error(f"Failed to save configuration: {e}")

    def update(self, **kwargs) -> None:
        """Update configuration with new values."""
        for key, value in kwargs.items():
            if hasattr(self, key):
                if isinstance(value, dict):
                    # Update nested configuration
                    current = getattr(self, key)
                    if isinstance(current, BaseModel):
                        for sub_key, sub_value in value.items():
                            if hasattr(current, sub_key):
                                setattr(current, sub_key, sub_value)
                else:
                    setattr(self, key, value)
        self.save()

    def reset(self) -> None:
        """Reset configuration to defaults."""
        self.server = ServerConfig()
        self.capture = CaptureConfig()
        self.gspro = GSProConfig()
        self.vision = VisionConfig()
        self.debug = False
        self.save()

    def to_dict(self) -> dict:
        """Convert configuration to dictionary."""
        return {
            "server": self.server.model_dump(),
            "capture": self.capture.model_dump(),
            "gspro": self.gspro.model_dump(),
            "vision": self.vision.model_dump(),
            "debug": self.debug,
            "config_path": str(self.config_path) if self.config_path else None,
        }


# Global configuration instance
_config: Optional[AppConfig] = None


@lru_cache(maxsize=1)
def get_config() -> AppConfig:
    """Get the global configuration instance."""
    global _config
    if _config is None:
        _config = AppConfig()
    return _config


def reset_config() -> None:
    """Reset the global configuration instance."""
    global _config
    _config = None
    get_config.cache_clear()