import json
import warnings

from src.server.utils.filesystem import sanitize_folder_name


class Serie:
    """
    Represents an anime series with metadata and episode information.
    
    The `key` property is the unique identifier for the series
    (provider-assigned, URL-safe).
    The `folder` property is the filesystem folder name
    (metadata only, not used for lookups).
    
    Args:
        key: Unique series identifier from provider
            (e.g., "attack-on-titan"). Cannot be empty.
        name: Display name of the series
        site: Provider site URL
        folder: Filesystem folder name (metadata only,
            e.g., "Attack on Titan (2013)")
        episodeDict: Dictionary mapping season numbers to
            lists of episode numbers
        
    Raises:
        ValueError: If key is None or empty string
    """
    
    def __init__(
        self,
        key: str,
        name: str,
        site: str,
        folder: str,
        episodeDict: dict[int, list[int]]
    ):
        if not key or not key.strip():
            raise ValueError("Serie key cannot be None or empty")
        
        self._key = key.strip()
        self._name = name
        self._site = site
        self._folder = folder
        self._episodeDict = episodeDict
        
    def __str__(self):
        """String representation of Serie object"""
        return (
            f"Serie(key='{self.key}', name='{self.name}', "
            f"site='{self.site}', folder='{self.folder}', "
            f"episodeDict={self.episodeDict})"
        )

    @property
    def key(self) -> str:
        """
        Unique series identifier (primary identifier for all lookups).
        
        This is the provider-assigned, URL-safe identifier used
        throughout the application for series identification,
        lookups, and operations.
        
        Returns:
            str: The unique series key
        """
        return self._key

    @key.setter
    def key(self, value: str):
        """
        Set the unique series identifier.
        
        Args:
            value: New key value
            
        Raises:
            ValueError: If value is None or empty string
        """
        if not value or not value.strip():
            raise ValueError("Serie key cannot be None or empty")
        self._key = value.strip()

    @property
    def name(self) -> str:
        return self._name

    @name.setter
    def name(self, value: str):
        self._name = value

    @property
    def site(self) -> str:
        return self._site

    @site.setter
    def site(self, value: str):
        self._site = value

    @property
    def folder(self) -> str:
        """
        Filesystem folder name (metadata only, not used for lookups).
        
        This property contains the local directory name where the series
        files are stored. It should NOT be used as an identifier for
        series lookups - use `key` instead.
        
        Returns:
            str: The filesystem folder name
        """
        return self._folder

    @folder.setter
    def folder(self, value: str):
        """
        Set the filesystem folder name.
        
        Args:
            value: Folder name for the series
        """
        self._folder = value

    @property
    def episodeDict(self) -> dict[int, list[int]]:
        return self._episodeDict

    @episodeDict.setter
    def episodeDict(self, value: dict[int, list[int]]):
        self._episodeDict = value

    @property
    def sanitized_folder(self) -> str:
        """
        Get a filesystem-safe folder name derived from the display name.
        
        This property returns a sanitized version of the series name
        suitable for use as a filesystem folder name. It removes/replaces
        characters that are invalid for filesystems while preserving
        Unicode characters.
        
        Use this property when creating folders for the series on disk.
        The `folder` property stores the actual folder name used.
        
        Returns:
            str: Filesystem-safe folder name based on display name
            
        Example:
            >>> serie = Serie("attack-on-titan", "Attack on Titan: Final", ...)
            >>> serie.sanitized_folder
            'Attack on Titan Final'
        """
        # Use name if available, fall back to folder, then key
        name_to_sanitize = self._name or self._folder or self._key
        try:
            return sanitize_folder_name(name_to_sanitize)
        except ValueError:
            # Fallback to key if name cannot be sanitized
            return sanitize_folder_name(self._key)

    def to_dict(self):
        """Convert Serie object to dictionary for JSON serialization."""
        return {
            "key": self.key,
            "name": self.name,
            "site": self.site,
            "folder": self.folder,
            "episodeDict": {
                str(k): list(v) for k, v in self.episodeDict.items()
            }
        }

    @staticmethod
    def from_dict(data: dict):
        """Create a Serie object from dictionary."""
        # Convert keys to int
        episode_dict = {
            int(k): v for k, v in data["episodeDict"].items()
        }
        return Serie(
            data["key"],
            data["name"],
            data["site"],
            data["folder"],
            episode_dict
        )

    def save_to_file(self, filename: str):
        """Save Serie object to JSON file.
        
        .. deprecated::
            File-based storage is deprecated. Use database storage via
            `AnimeSeriesService.create()` instead. This method will be
            removed in v3.0.0.
            
        Args:
            filename: Path to save the JSON file
        """
        warnings.warn(
            "save_to_file() is deprecated and will be removed in v3.0.0. "
            "Use database storage via AnimeSeriesService.create() instead.",
            DeprecationWarning,
            stacklevel=2
        )
        with open(filename, "w", encoding="utf-8") as file:
            json.dump(self.to_dict(), file, indent=4)

    @classmethod
    def load_from_file(cls, filename: str) -> "Serie":
        """Load Serie object from JSON file.
        
        .. deprecated::
            File-based storage is deprecated. Use database storage via
            `AnimeSeriesService.get_by_key()` instead. This method will be
            removed in v3.0.0.
            
        Args:
            filename: Path to load the JSON file from
            
        Returns:
            Serie: The loaded Serie object
        """
        warnings.warn(
            "load_from_file() is deprecated and will be removed in v3.0.0. "
            "Use database storage via AnimeSeriesService instead.",
            DeprecationWarning,
            stacklevel=2
        )
        with open(filename, "r", encoding="utf-8") as file:
            data = json.load(file)
        return cls.from_dict(data)