"""
DungeonMaster AI - Adventure Loader

Loads and manages adventure JSON files for pre-made scenarios.
"""

from __future__ import annotations

import json
import logging
from pathlib import Path
from typing import TYPE_CHECKING

from .models import (
    AdventureData,
    EncounterData,
    NPCInfo,
    SceneInfo,
)

if TYPE_CHECKING:
    from .game_state_manager import GameStateManager

logger = logging.getLogger(__name__)

# Default adventures directory relative to project root
DEFAULT_ADVENTURES_DIR = Path(__file__).parent.parent.parent / "adventures"


class AdventureLoader:
    """
    Loads and manages adventure JSON files.

    Adventures are pre-made scenarios with scenes, NPCs, encounters,
    and victory conditions. This class handles loading, parsing,
    and initializing games from adventure files.
    """

    def __init__(
        self,
        adventures_dir: Path | str | None = None,
    ) -> None:
        """
        Initialize the adventure loader.

        Args:
            adventures_dir: Directory containing adventure JSON files.
                           Defaults to 'adventures/' in project root.
        """
        if adventures_dir is None:
            self._adventures_dir = DEFAULT_ADVENTURES_DIR
        else:
            self._adventures_dir = Path(adventures_dir)

        # Cache loaded adventures
        self._cache: dict[str, AdventureData] = {}

        logger.debug(f"AdventureLoader initialized with dir: {self._adventures_dir}")

    @property
    def adventures_dir(self) -> Path:
        """Get the adventures directory path."""
        return self._adventures_dir

    # =========================================================================
    # Adventure Discovery
    # =========================================================================

    def list_adventures(self) -> list[dict[str, str]]:
        """
        List all available adventures.

        Returns:
            List of adventure info dicts with keys:
            - name: Adventure name
            - file: Filename
            - description: Adventure description
            - difficulty: Difficulty level
            - estimated_time: Estimated play time
        """
        adventures: list[dict[str, str]] = []

        if not self._adventures_dir.exists():
            logger.warning(f"Adventures directory not found: {self._adventures_dir}")
            return adventures

        for json_file in self._adventures_dir.glob("*.json"):
            # Skip sample_characters directory
            if json_file.is_dir():
                continue

            try:
                with open(json_file, encoding="utf-8") as f:
                    data = json.load(f)

                metadata = data.get("metadata", {})
                adventures.append(
                    {
                        "name": metadata.get("name", json_file.stem),
                        "file": json_file.name,
                        "description": metadata.get("description", ""),
                        "difficulty": metadata.get("difficulty", "medium"),
                        "estimated_time": metadata.get("estimated_time", "Unknown"),
                        "recommended_level": str(
                            metadata.get("recommended_level", 1)
                        ),
                    }
                )
            except (json.JSONDecodeError, OSError) as e:
                logger.warning(f"Failed to load adventure {json_file}: {e}")
                continue

        return adventures

    # =========================================================================
    # Adventure Loading
    # =========================================================================

    def load(self, adventure_name: str) -> AdventureData | None:
        """
        Load an adventure by name.

        Checks cache first, then loads from file.

        Args:
            adventure_name: Name of adventure or filename (with/without .json)

        Returns:
            AdventureData if found, None otherwise
        """
        # Check cache
        if adventure_name in self._cache:
            return self._cache[adventure_name]

        # Find the file
        json_file = self._find_adventure_file(adventure_name)
        if json_file is None:
            logger.warning(f"Adventure not found: {adventure_name}")
            return None

        # Load and parse
        try:
            with open(json_file, encoding="utf-8") as f:
                data = json.load(f)

            adventure = AdventureData.from_json(data)

            # Cache by both name and filename
            self._cache[adventure_name] = adventure
            self._cache[adventure.metadata.name] = adventure
            self._cache[json_file.stem] = adventure

            logger.info(f"Loaded adventure: {adventure.metadata.name}")
            return adventure

        except (json.JSONDecodeError, OSError) as e:
            logger.error(f"Failed to load adventure {json_file}: {e}")
            return None
        except Exception as e:
            logger.error(f"Failed to parse adventure {json_file}: {e}")
            return None

    def _find_adventure_file(self, adventure_name: str) -> Path | None:
        """
        Find an adventure file by name.

        Args:
            adventure_name: Name or filename to search for

        Returns:
            Path to file if found, None otherwise
        """
        if not self._adventures_dir.exists():
            return None

        # Try exact filename
        exact_path = self._adventures_dir / adventure_name
        if exact_path.exists():
            return exact_path

        # Try with .json extension
        json_path = self._adventures_dir / f"{adventure_name}.json"
        if json_path.exists():
            return json_path

        # Try matching by metadata name
        for json_file in self._adventures_dir.glob("*.json"):
            try:
                with open(json_file, encoding="utf-8") as f:
                    data = json.load(f)
                    metadata = data.get("metadata", {})
                    if metadata.get("name", "").lower() == adventure_name.lower():
                        return json_file
            except (json.JSONDecodeError, OSError):
                continue

        return None

    # =========================================================================
    # Game Initialization
    # =========================================================================

    async def initialize_game(
        self,
        manager: GameStateManager,
        adventure_name: str,
    ) -> bool:
        """
        Initialize a game session with an adventure.

        Args:
            manager: GameStateManager to initialize
            adventure_name: Name of adventure to load

        Returns:
            True if successful, False otherwise
        """
        adventure = self.load(adventure_name)
        if adventure is None:
            return False

        try:
            # Start new game with adventure name
            await manager.new_game(adventure=adventure.metadata.name)

            # Set starting location
            starting_scene = adventure.starting_scene
            scene_id = str(starting_scene.get("scene_id", ""))
            scene_info = self.get_scene(adventure_name, scene_id)

            if scene_info:
                manager.set_location(scene_info.name, scene_info)
            else:
                # Fallback to basic location from starting scene
                manager.set_location(
                    str(starting_scene.get("scene_id", "Unknown")),
                    None,
                )

            # Add all NPCs to manager
            for npc_data in adventure.npcs:
                if isinstance(npc_data, dict):
                    npc = self._parse_npc(npc_data)
                    if npc:
                        manager.add_known_npc(npc)

            # Set initial story flags
            manager.set_story_flag("adventure_started", True)
            manager.set_story_flag("adventure_name", adventure.metadata.name)

            logger.info(
                f"Initialized game with adventure: {adventure.metadata.name}"
            )
            return True

        except Exception as e:
            logger.error(f"Failed to initialize game with adventure: {e}")
            return False

    # =========================================================================
    # Content Retrieval
    # =========================================================================

    def get_starting_narrative(self, adventure_name: str) -> str:
        """
        Get the opening narrative for an adventure.

        Args:
            adventure_name: Name of adventure

        Returns:
            Opening narrative text, or empty string if not found
        """
        adventure = self.load(adventure_name)
        if adventure is None:
            return ""

        starting_scene = adventure.starting_scene
        return str(starting_scene.get("narrative", ""))

    def get_scene(
        self,
        adventure_name: str,
        scene_id: str,
    ) -> SceneInfo | None:
        """
        Get a scene from an adventure.

        Args:
            adventure_name: Name of adventure
            scene_id: Scene ID to find

        Returns:
            SceneInfo if found, None otherwise
        """
        adventure = self.load(adventure_name)
        if adventure is None:
            return None

        scene_data = adventure.get_scene(scene_id)
        if scene_data is None:
            return None

        return self._parse_scene(scene_data)

    def get_encounter(
        self,
        adventure_name: str,
        encounter_id: str,
    ) -> EncounterData | None:
        """
        Get an encounter from an adventure.

        Args:
            adventure_name: Name of adventure
            encounter_id: Encounter ID to find

        Returns:
            EncounterData if found, None otherwise
        """
        adventure = self.load(adventure_name)
        if adventure is None:
            return None

        return adventure.get_encounter(encounter_id)

    def get_npc(
        self,
        adventure_name: str,
        npc_id: str,
    ) -> NPCInfo | None:
        """
        Get an NPC from an adventure.

        Args:
            adventure_name: Name of adventure
            npc_id: NPC ID to find

        Returns:
            NPCInfo if found, None otherwise
        """
        adventure = self.load(adventure_name)
        if adventure is None:
            return None

        npc_data = adventure.get_npc(npc_id)
        if npc_data is None:
            return None

        return self._parse_npc(npc_data)

    def get_all_scenes(self, adventure_name: str) -> list[SceneInfo]:
        """
        Get all scenes from an adventure.

        Args:
            adventure_name: Name of adventure

        Returns:
            List of all SceneInfo objects
        """
        adventure = self.load(adventure_name)
        if adventure is None:
            return []

        scenes: list[SceneInfo] = []
        for scene_data in adventure.scenes:
            if isinstance(scene_data, dict):
                scene = self._parse_scene(scene_data)
                if scene:
                    scenes.append(scene)

        return scenes

    def get_all_npcs(self, adventure_name: str) -> list[NPCInfo]:
        """
        Get all NPCs from an adventure.

        Args:
            adventure_name: Name of adventure

        Returns:
            List of all NPCInfo objects
        """
        adventure = self.load(adventure_name)
        if adventure is None:
            return []

        npcs: list[NPCInfo] = []
        for npc_data in adventure.npcs:
            if isinstance(npc_data, dict):
                npc = self._parse_npc(npc_data)
                if npc:
                    npcs.append(npc)

        return npcs

    # =========================================================================
    # Parsing Helpers
    # =========================================================================

    def _parse_scene(self, data: dict[str, object]) -> SceneInfo | None:
        """
        Parse a scene dict into SceneInfo.

        Args:
            data: Raw scene data

        Returns:
            SceneInfo if valid, None otherwise
        """
        try:
            scene_id = str(data.get("scene_id", ""))
            if not scene_id:
                return None

            # Extract sensory details
            details = data.get("details", {})
            sensory: dict[str, str] = {}
            if isinstance(details, dict):
                sensory_raw = details.get("sensory", {})
                if isinstance(sensory_raw, dict):
                    for key, value in sensory_raw.items():
                        sensory[str(key)] = str(value)

            # Extract searchable objects
            searchable: list[dict[str, object]] = []
            if isinstance(details, dict):
                searchable_raw = details.get("searchable", [])
                if isinstance(searchable_raw, list):
                    searchable = [
                        dict(obj) for obj in searchable_raw if isinstance(obj, dict)
                    ]

            # Extract encounter ID
            encounter = data.get("encounter")
            encounter_id: str | None = None
            if isinstance(encounter, dict):
                encounter_id = str(encounter.get("encounter_id", ""))
            elif isinstance(encounter, str):
                encounter_id = encounter

            return SceneInfo(
                scene_id=scene_id,
                name=str(data.get("name", scene_id)),
                description=str(data.get("description", "")),
                sensory_details=sensory,
                exits=dict(data.get("exits", {})),
                npcs_present=list(data.get("npcs_present", [])),
                items=list(data.get("items", [])),
                encounter_id=encounter_id if encounter_id else None,
                searchable_objects=searchable,
            )

        except Exception as e:
            logger.warning(f"Failed to parse scene: {e}")
            return None

    def _parse_npc(self, data: dict[str, object]) -> NPCInfo | None:
        """
        Parse an NPC dict into NPCInfo.

        Args:
            data: Raw NPC data

        Returns:
            NPCInfo if valid, None otherwise
        """
        try:
            npc_id = str(data.get("npc_id", ""))
            if not npc_id:
                return None

            return NPCInfo(
                npc_id=npc_id,
                name=str(data.get("name", "Unknown")),
                description=str(data.get("description", "")),
                personality=str(data.get("personality", "")),
                voice_profile=str(data.get("voice_profile", "dm")),
                dialogue_hooks=list(data.get("dialogue_hooks", [])),
                monster_stat_block=data.get("monster_stat_block"),
                relationship="hostile"
                if data.get("monster_stat_block")
                else "neutral",
            )

        except Exception as e:
            logger.warning(f"Failed to parse NPC: {e}")
            return None

    # =========================================================================
    # Cache Management
    # =========================================================================

    def clear_cache(self) -> None:
        """Clear the adventure cache."""
        self._cache.clear()
        logger.debug("Adventure cache cleared")

    def is_cached(self, adventure_name: str) -> bool:
        """
        Check if an adventure is cached.

        Args:
            adventure_name: Name of adventure

        Returns:
            True if cached, False otherwise
        """
        return adventure_name in self._cache

    def preload(self, adventure_names: list[str]) -> int:
        """
        Preload multiple adventures into cache.

        Args:
            adventure_names: List of adventure names to load

        Returns:
            Number of successfully loaded adventures
        """
        loaded = 0
        for name in adventure_names:
            if self.load(name) is not None:
                loaded += 1
        return loaded

    def __len__(self) -> int:
        """Return number of cached adventures."""
        return len(self._cache)