import json
import os
from typing import Dict, Any, Optional
import datetime


CONFIG_DIR = ".letxipu"
CONFIG_FILE = "search-config.json"
PRESETS_FILE = "presets.json"


class PersistenceManager:
    def __init__(self, project_path: str = "."):
        self.config_dir = os.path.join(project_path, CONFIG_DIR)
        self.config_file = os.path.join(self.config_dir, CONFIG_FILE)
        self.presets_file = os.path.join(self.config_dir, PRESETS_FILE)
        os.makedirs(self.config_dir, exist_ok=True)

    def save_config(self, config: Dict[str, Any]):
        with open(self.config_file, "w", encoding="utf-8") as f:
            json.dump(config, f, indent=2, ensure_ascii=False)

    def load_config(self) -> Dict[str, Any]:
        if os.path.exists(self.config_file):
            with open(self.config_file, "r", encoding="utf-8") as f:
                return json.load(f)
        return {}

    def save_preset(self, name: str, config: Dict[str, Any]):
        presets = self.load_presets()
        presets[name] = {
            "config": config,
            "timestamp": datetime.datetime.now().isoformat(),
        }
        with open(self.presets_file, "w", encoding="utf-8") as f:
            json.dump(presets, f, indent=2, ensure_ascii=False)

    def load_presets(self) -> Dict[str, Any]:
        if os.path.exists(self.presets_file):
            with open(self.presets_file, "r", encoding="utf-8") as f:
                return json.load(f)
        return {}

    def load_preset(self, name: str) -> Optional[Dict[str, Any]]:
        presets = self.load_presets()
        return presets.get(name, {}).get("config")

    def delete_preset(self, name: str):
        presets = self.load_presets()
        if name in presets:
            del presets[name]
            with open(self.presets_file, "w", encoding="utf-8") as f:
                json.dump(presets, f, indent=2, ensure_ascii=False)

    def list_presets(self) -> list:
        return list(self.load_presets().keys())