# file: battlewords/local_storage.py
"""
Storage module for BattleWords game.

Provides functionality for:
1. Saving/loading game results to local JSON files
2. Managing high scores and leaderboards
3. Sharing game IDs via query strings
"""

from __future__ import annotations
from dataclasses import dataclass, field, asdict
from typing import List, Dict, Optional, Any
from datetime import datetime
import json
import os
from pathlib import Path

@dataclass
class GameResult:
    game_id: str
    wordlist: str
    game_mode: str
    score: int
    tier: str
    elapsed_seconds: int
    words_found: List[str]
    completed_at: str
    player_name: Optional[str] = None

    def to_dict(self) -> Dict[str, Any]:
        return asdict(self)

    @classmethod
    def from_dict(cls, data: Dict[str, Any]) -> "GameResult":
        return cls(**data)

@dataclass
class HighScoreEntry:
    player_name: str
    score: int
    tier: str
    wordlist: str
    game_mode: str
    elapsed_seconds: int
    completed_at: str
    game_id: str

    def to_dict(self) -> Dict[str, Any]:
        return asdict(self)

    @classmethod
    def from_dict(cls, data: Dict[str, Any]) -> "HighScoreEntry":
        return cls(**data)

class GameStorage:
    def __init__(self, storage_dir: Optional[str] = None):
        if storage_dir is None:
            storage_dir = os.path.join(
                os.path.expanduser("~"),
                ".battlewords",
                "data"
            )
        self.storage_dir = Path(storage_dir)
        self.storage_dir.mkdir(parents=True, exist_ok=True)
        self.results_file = self.storage_dir / "game_results.json"
        self.highscores_file = self.storage_dir / "highscores.json"

    def save_result(self, result: GameResult) -> bool:
        try:
            results = self.load_all_results()
            results.append(result.to_dict())
            with open(self.results_file, 'w', encoding='utf-8') as f:
                json.dump(results, f, indent=2, ensure_ascii=False)
            self._update_highscores(result)
            return True
        except Exception as e:
            print(f"Error saving result: {e}")
            return False

    def load_all_results(self) -> List[Dict[str, Any]]:
        if not self.results_file.exists():
            return []
        try:
            with open(self.results_file, 'r', encoding='utf-8') as f:
                return json.load(f)
        except Exception as e:
            print(f"Error loading results: {e}")
            return []

    def get_results_by_game_id(self, game_id: str) -> List[GameResult]:
        all_results = self.load_all_results()
        matching = [
            GameResult.from_dict(r)
            for r in all_results
            if r.get("game_id") == game_id
        ]
        return sorted(matching, key=lambda x: x.score, reverse=True)

    def _update_highscores(self, result: GameResult) -> None:
        highscores = self.load_highscores()
        entry = HighScoreEntry(
            player_name=result.player_name or "Anonymous",
            score=result.score,
            tier=result.tier,
            wordlist=result.wordlist,
            game_mode=result.game_mode,
            elapsed_seconds=result.elapsed_seconds,
            completed_at=result.completed_at,
            game_id=result.game_id
        )
        highscores.append(entry.to_dict())
        highscores.sort(key=lambda x: x["score"], reverse=True)
        highscores = highscores[:100]
        with open(self.highscores_file, 'w', encoding='utf-8') as f:
            json.dump(highscores, f, indent=2, ensure_ascii=False)

    def load_highscores(
        self,
        wordlist: Optional[str] = None,
        game_mode: Optional[str] = None,
        limit: int = 10
    ) -> List[HighScoreEntry]:
        if not self.highscores_file.exists():
            return []
        try:
            with open(self.highscores_file, 'r', encoding='utf-8') as f:
                scores = json.load(f)
            if wordlist:
                scores = [s for s in scores if s.get("wordlist") == wordlist]
            if game_mode:
                scores = [s for s in scores if s.get("game_mode") == game_mode]
            scores.sort(key=lambda x: x["score"], reverse=True)
            return [HighScoreEntry.from_dict(s) for s in scores[:limit]]
        except Exception as e:
            print(f"Error loading highscores: {e}")
            return []

    def get_player_stats(self, player_name: str) -> Dict[str, Any]:
        all_results = self.load_all_results()
        player_results = [
            GameResult.from_dict(r)
            for r in all_results
            if r.get("player_name") == player_name
        ]
        if not player_results:
            return {
                "games_played": 0,
                "total_score": 0,
                "average_score": 0,
                "best_score": 0,
                "best_tier": None
            }
        scores = [r.score for r in player_results]
        return {
            "games_played": len(player_results),
            "total_score": sum(scores),
            "average_score": sum(scores) / len(scores),
            "best_score": max(scores),
            "best_tier": max(player_results, key=lambda x: x.score).tier,
            "fastest_time": min(r.elapsed_seconds for r in player_results)
        }

def save_json_to_file(data: dict, directory: str, filename: str = "settings.json") -> str:
    """
    Save a dictionary as a JSON file with a specified filename in the given directory.
    Returns the full path to the saved file.
    """
    os.makedirs(directory, exist_ok=True)
    file_path = os.path.join(directory, filename)
    with open(file_path, "w", encoding="utf-8") as f:
        json.dump(data, f, indent=2, ensure_ascii=False)
    return file_path

def generate_game_id_from_words(words: List[str]) -> str:
    import hashlib
    sorted_words = sorted([w.upper() for w in words])
    word_string = "".join(sorted_words)
    hash_obj = hashlib.sha256(word_string.encode('utf-8'))
    return hash_obj.hexdigest()[:8].upper()

def parse_game_id_from_url() -> Optional[str]:
    try:
        import streamlit as st
        params = st.query_params
        return params.get("game_id")
    except Exception:
        return None

def create_shareable_url(game_id: str, base_url: Optional[str] = None) -> str:
    if base_url is None:
        base_url = "https://huggingface.co/spaces/Surn/BattleWords"
    return f"{base_url}?game_id={game_id}"