# radar_data_reader/utils/config_manager.py

"""
Configuration Manager for the application.
Handles loading and saving of application settings to a JSON file.
"""

import json
from pathlib import Path
from typing import Dict, Any, Optional, List

from . import logger
from ..core.export_profiles import ExportProfile, ExportField

log = logger.get_logger(__name__)


class ConfigManager:
    """Manages loading and saving configuration from/to a JSON file."""

    def __init__(self, config_path: Path):
        self.config_path: Path = config_path
        self.config: Dict[str, Any] = {}
        self.export_profiles: List[ExportProfile] = []

    @staticmethod
    def _get_default_config() -> Dict[str, Any]:
        """Provides the default configuration structure for the entire application."""
        default_export_profile = ExportProfile(
            name="Default",
            fields=[
                ExportField(column_name="batch_id", data_path="batch_id"),
                ExportField(column_name="timetag", data_path="main_header.ge_header.signal_descr.ttag"),
            ],
        )
        
        default_cpp_config = {
            "cpp_executable_path": "C:/path/to/your/g_reconvert.exe",
            "analyze_only": False, "no_sign": False, "use_fw_header": False,
            "fix_dsp_bug": False, "sync_signal_flows": False, "extract_sw_only": False,
            "extract_dsp_only": False, "stop_on_discontinuity": False, "dry_run": False,
            "start_from_stby": False, "fix_sata_date": False, "examine_data": False,
            "post_process": True, "post_process_level": "1", "output_format": "",
            "json_config_file": "", "max_batches": "", "pri_number": "", "rbin_number": "",
            "video_out_to_rec": False, "video_show": True, "video_save": True,
            "video_fix_framerate": False, "gps_save_track": True, "fix_hr_debug": False,
            "sar_save_only": False, "video_add_subtitles": False, "verbose": False,
            "debug_messages": False, "quiet": False, "mask_warnings": False,
            "mask_errors": False, "silent_overwrite": True
        }

        return {
            "last_opened_out_file": "",
            "last_opened_rec_file": "",
            "last_out_output_dir": "",
            "last_rec_output_dir": "",
            "active_out_export_profile_name": "Default",
            "export_profiles": [default_export_profile.to_dict()],
            "cpp_converter_config": default_cpp_config,
        }

    def load_config(self) -> None:
        """Loads the main application configuration from the JSON file."""
        log.info(f"Attempting to load configuration from: {self.config_path}")
        if self.config_path.is_file():
            try:
                with open(self.config_path, "r", encoding="utf-8") as f:
                    loaded_data = json.load(f)
                
                # Ensure all keys from default config are present
                default_conf = self._get_default_config()
                self.config = default_conf
                self.config.update(loaded_data)

                # Specifically handle nested dictionaries to ensure all sub-keys are present
                if "cpp_converter_config" in loaded_data:
                    self.config["cpp_converter_config"].update(loaded_data["cpp_converter_config"])
                
                profiles_data = self.config.get("export_profiles", [])
                self.export_profiles = [ExportProfile.from_dict(p_data) for p_data in profiles_data]

                if not self.export_profiles:
                    self._load_default_profiles()

                log.info(f"Configuration loaded. Found {len(self.export_profiles)} export profiles.")

            except (json.JSONDecodeError, IOError, KeyError) as e:
                log.error(f"Failed to load or parse config file: {e}. Using defaults.")
                self.config = self._get_default_config()
                self._load_default_profiles()
        else:
            log.warning("Configuration file not found. Using default settings.")
            self.config = self._get_default_config()
            self._load_default_profiles()

    def _load_default_profiles(self):
        """Loads just the default profiles from the default config."""
        default_conf = self._get_default_config()
        profiles_data = default_conf.get("export_profiles", [])
        self.export_profiles = [ExportProfile.from_dict(p_data) for p_data in profiles_data]

    def save_config(self) -> None:
        """Saves the current configuration to the JSON file."""
        log.info(f"Saving configuration to: {self.config_path}")

        # Ensure the main config dict is up-to-date before saving
        self.config["export_profiles"] = [profile.to_dict() for profile in self.export_profiles]
        
        try:
            self.config_path.parent.mkdir(parents=True, exist_ok=True)
            with open(self.config_path, "w", encoding="utf-8") as f:
                json.dump(self.config, f, indent=4)
            log.info("Configuration saved successfully.")
        except IOError as e:
            log.error(f"Failed to save configuration file: {e}")

    def get(self, key: str, default: Optional[Any] = None) -> Any:
        """Gets a value from the configuration."""
        return self.config.get(key, default)

    def set(self, key: str, value: Any) -> None:
        """Sets a value in the configuration."""
        self.config[key] = value
        
    def get_cpp_converter_config(self) -> Dict[str, Any]:
        """Returns the specific configuration for the C++ converter."""
        return self.config.get("cpp_converter_config", self._get_default_config()["cpp_converter_config"])
        
    def save_cpp_converter_config(self, new_config: Dict[str, Any]):
        """Updates the C++ converter configuration and saves the entire config file."""
        self.config["cpp_converter_config"] = new_config
        self.save_config()

    def get_export_profiles(self) -> List[ExportProfile]:
        """Returns the list of loaded export profiles."""
        return self.export_profiles

    def save_export_profiles(self, profiles: List[ExportProfile]):
        """Updates the list of export profiles and saves the config."""
        self.export_profiles = profiles
        self.save_config()