import configparser
import structlog
import json


class CONFIG:
    """
    CONFIG class for handling with config files

    """

    config_types = {
        'NETWORK': {
            'modemaddress': str,
            'modemport': int,
        },
        'STATION': {
            'mycall': str,
            'mygrid': str,
            'myssid': int,
            'ssid_list': list,
            'enable_explorer': bool,
            'enable_stats': bool,
            'respond_to_cq': bool,
            'enable_callsign_blacklist': bool,
            'callsign_blacklist': list

        },
        'AUDIO': {
            'input_device': str,
            'output_device': str,
            'rx_audio_level': int,
            'tx_audio_level': int,
            'rx_auto_audio_level': bool,
            'tx_auto_audio_level': bool,
        },
        'RADIO': {
            'control': str,
            'serial_port': str,
            'model_id': int,
            'serial_speed': int,
            'data_bits': int,
            'stop_bits': int,
            'serial_handshake': str,
            'ptt_port': str,
            'ptt_type': str,
            'serial_dcd': str,
            'serial_dtr': str,
            'serial_rts': str,
        },
        'RIGCTLD': {
            'ip': str,
            'port': int,
            'path': str,
            'command': str,
            'arguments': str,
            'enable_vfo': bool,
        },
        'FLRIG': {
            'ip': str,
            'port': int,
        },
        'MODEM': {
            'enable_morse_identifier': bool,
            'maximum_bandwidth': int,
            'tx_delay': int,
        },
        'SOCKET_INTERFACE': {
            'enable': bool,
            'host': str,
            'cmd_port': int,
            'data_port': int,
        },
        'MESSAGES': {
            'enable_auto_repeat': bool,
        },
        'QSO_LOGGING': {
            'enable_adif_udp': bool,
            'adif_udp_host': str,
            'adif_udp_port': int,
            'enable_adif_wavelog': bool,
            'adif_wavelog_host': str,
            'adif_wavelog_api_key': str,
        },

        'GUI': {
            'auto_run_browser': bool,
        },
        'EXP': {
            'enable_ring_buffer': bool,
            'enable_vhf': bool,
        }
    }

    default_values = {
        list: '[]',
        bool: 'False',
        int: '0',
        str: '',
    }

    def __init__(self, ctx, configfile: str):
        """Initializes a new CONFIG instance.

        This method initializes the configuration handler with the specified
        config file. It sets up the logger, config parser, and validates
        the config file's existence and structure.

        Args:
            configfile (str): The path to the configuration file.
        """
        self.ctx = ctx
        # set up logger
        self.log = structlog.get_logger(type(self).__name__)

        # init configparser
        self.parser = configparser.ConfigParser(inline_comment_prefixes="#", allow_no_value=True)

        try:
            self.config_name = configfile
        except Exception:
            self.config_name = "config.ini"

        # self.log.info("[CFG] config init", file=self.config_name)

        # check if config file exists
        self.config_exists()

        # validate config structure
        self.validate_config()

        # read config
        self.config = self.read()
        
    def config_exists(self):
        """Checks if the configuration file exists and can be read.

        This method attempts to read the configuration file and returns True
        if successful, False otherwise. It logs any errors encountered during
        the reading process.

        Returns:
            bool: True if the config file exists and is readable, False otherwise.
        """
        try:
            return bool(self.parser.read(self.config_name, None))
        except Exception as configerror:
            self.log.error("[CFG] logfile init error", e=configerror)
            return False

    # Validates config data
    def validate_data(self, data):
        """Validates the data types of configuration settings.

        This method checks if the provided data matches the expected data
        types defined in config_types. It raises a ValueError if a data type
        mismatch is found.

        Args:
            data (dict): The configuration data to validate.

        Raises:
            ValueError: If a data type mismatch is found.
        """
        for section in data:
            for setting in data[section]:
                if not isinstance(data[section][setting], self.config_types[section][setting]):
                    message = (f"{section}.{setting} must be {self.config_types[section][setting]}."
                               f" '{data[section][setting]}' {type(data[section][setting])} given.")
                    raise ValueError(message)

    def validate_config(self):
        """Validates and updates the configuration file structure.

        This method checks the existing configuration file against the
        defined config_types. It removes any undefined sections or settings,
        adds missing sections and settings with default values, and then
        writes the updated configuration back to the file.

        Returns:
            dict or bool: A dictionary containing the updated configuration
            data if successful, False otherwise.
        """
        existing_sections = self.parser.sections()

        # Remove sections and settings not defined in self.config_types
        for section in existing_sections:
            if section not in self.config_types:
                self.parser.remove_section(section)
                self.log.info(f"[CFG] Removing undefined section: {section}")
                continue
            existing_settings = self.parser.options(section)
            for setting in existing_settings:
                if setting not in self.config_types[section]:
                    self.parser.remove_option(section, setting)
                    self.log.info(f"[CFG] Removing undefined setting: {section}.{setting}")

        # Add missing sections and settings from self.config_types
        for section, settings in self.config_types.items():
            if section not in existing_sections:
                self.parser.add_section(section)
                self.log.info(f"[CFG] Adding missing section: {section}")
            for setting, value_type in settings.items():
                if not self.parser.has_option(section, setting):
                    default_value = self.default_values.get(value_type, None)

                    self.parser.set(section, setting, str(default_value))
                    self.log.info(f"[CFG] Adding missing setting: {section}.{setting}")
        return self.write_to_file()

    def handle_setting(self, section, setting, value, is_writing=False):
        """Handles special data type conversions for config settings.

        This method performs data type conversions for specific config settings,
        such as lists and booleans, when reading from or writing to the config
        file. It also handles KeyErrors if a setting is not found in the
        config_types dictionary.

        Args:
            section (str): The config section name.
            setting (str): The config setting name.
            value: The value to be converted.
            is_writing (bool, optional): True if writing to the config file,
                False if reading from it. Defaults to False.

        Returns:
            The converted value, or the original value if no conversion is needed.
        """
        try:
            if self.config_types[section][setting] == list:
                if is_writing:
                    # When writing, ensure the value is a list and then convert it to JSON
                    if isinstance(value, str):
                        value = json.loads(value)  # Convert JSON string to list
                    return json.dumps(value)  # Convert list to JSON string
                else:
                    # When reading, convert the JSON string back to a list
                    if isinstance(value, str):
                        return json.loads(value)
                    return value  # Return as-is if already a list

            elif self.config_types[section][setting] == bool and not is_writing:
                return self.parser.getboolean(section, setting)

            elif self.config_types[section][setting] == int and not is_writing:
                return self.parser.getint(section, setting)

            else:
                return value
        except KeyError as key:
            self.log.error("[CFG] key error in logfile, please check 'config.ini.example' for help", key=key)

    # Sets and writes config data from a dict containing data settings
    def write(self, data):
        """Writes the provided data to the configuration file.

        This method validates the input data, converts it to the appropriate
        types, writes it to the configuration file, and returns the updated
        configuration as a dictionary. It logs any errors encountered
        during the writing process.

        Args:
            data (dict): A dictionary containing the configuration data to write.

        Returns:
            dict or bool: A dictionary containing the updated configuration
            data if successful, False otherwise.
        """
        # Validate config data before writing
        self.validate_data(data)
        for section in data:
            # init section if it doesn't exist yet
            if not section.upper() in self.parser.keys():
                self.parser[section] = {}

            for setting in data[section]:
                new_value = self.handle_setting(
                    section, setting, data[section][setting], True)
                try:
                    self.parser[section][setting] = str(new_value)
                except Exception as e:
                    self.log.error("[CFG] error setting config key", e=e)
        return self.write_to_file()

    def write_to_file(self):
        """Writes the current configuration to the config file.

        This method writes the in-memory configuration data to the
        configuration file. It then rereads and returns the updated
        configuration. It logs any errors encountered during the writing
        process.

        Returns:
            dict or bool: A dictionary containing the updated configuration
            data if successful, False otherwise.
        """
        try:
            with open(self.config_name, 'w') as configfile:
                self.parser.write(configfile)
                self.ctx.config = self.read()

                return self.ctx.config
        except Exception as conferror:
            self.log.error("[CFG] reading logfile", e=conferror)
            return False

    def read(self):
        """Reads the configuration file.

        This method reads the configuration file, handles special setting data
        type conversions, and returns the configuration as a dictionary.
        It logs any errors encountered during the reading process.

        Returns:
            dict or bool: A dictionary containing the configuration data if
            successful, False otherwise.
        """
        # self.log.info("[CFG] reading...")
        if not self.config_exists():
            return False
        try:
            # at first just copy the config as read from file
            result = {s: dict(self.parser.items(s)) for s in self.parser.sections()}

            # handle the special settings
            for section in result:
                for setting in result[section]:
                    result[section][setting] = self.handle_setting(
                       section, setting, result[section][setting], False)

            # store config in config manager instance
            self.config = result

            return result
        except Exception as conferror:
            self.log.error("[CFG] reading logfile", e=conferror)
            return False