#!/usr/bin/python
# -*- coding: utf-8 -*-
r"""!
    ____  ____  ______       __      __       __       _____
   / __ )/ __ \/ ___/ |     / /___ _/ /______/ /_     |__  /
  / __  / / / /\__ \| | /| / / __ `/ __/ ___/ __ \     /_ <
 / /_/ / /_/ /___/ /| |/ |/ / /_/ / /_/ /__/ / / /   ___/ /
/_____/\____//____/ |__/|__/\__,_/\__/\___/_/ /_/   /____/
                German BOS Information Script
                     by Bastian Schroll

@file:        descriptor.py
@date:        04.08.2025
@author:      Bastian Schroll
@description: Module to add descriptions to bwPackets with CSV and Regex support
"""
import logging
import csv
import re
import os
from module.moduleBase import ModuleBase

# ###################### #
# Custom plugin includes #

# ###################### #

logging.debug("- %s loaded", __name__)


class BoswatchModule(ModuleBase):
    r"""!Adds descriptions to bwPackets with CSV and Regex support"""
    def __init__(self, config):
        r"""!Do not change anything here!"""
        super().__init__(__name__, config)  # you can access the config class on 'self.config'

    def onLoad(self):
        r"""!Called by import of the plugin"""
        # Initialize unified cache for all descriptors
        self.unified_cache = {}

        # Process each descriptor configuration
        for descriptor_config in self.config:
            scan_field = descriptor_config.get("scanField")
            descr_field = descriptor_config.get("descrField")
            descriptor_key = f"{scan_field}_{descr_field}"

            # Register wildcard if specified
            if descriptor_config.get("wildcard", default=None):
                self.registerWildcard(descriptor_config.get("wildcard"), descr_field)

            # Initialize cache for this descriptor
            self.unified_cache[descriptor_key] = []

            # Load YAML descriptions first (for backward compatibility)
            yaml_descriptions = descriptor_config.get("descriptions", default=None)
            if yaml_descriptions:
                # yaml_descriptions is a Config object, we need to iterate properly
                for desc in yaml_descriptions:
                    entry = {
                        'for': str(desc.get("for", default="")),
                        'add': desc.get("add", default=""),
                        'isRegex': desc.get("isRegex", default=False)  # Default: False
                    }
                    # Handle string 'true'/'false' values
                    if isinstance(entry['isRegex'], str):
                        entry['isRegex'] = entry['isRegex'].lower() == 'true'

                    self.unified_cache[descriptor_key].append(entry)
                    logging.debug("Added YAML entry: %s -> %s", entry['for'], entry['add'])
                logging.info("Loaded %d YAML descriptions for %s", len(yaml_descriptions), descriptor_key)

            # Load CSV descriptions if csvPath is specified
            csv_path = descriptor_config.get("csvPath", default=None)
            if csv_path:
                self._load_csv_data(csv_path, descriptor_key)

            logging.info("Total entries for %s: %d", descriptor_key, len(self.unified_cache[descriptor_key]))

    def _load_csv_data(self, csv_path, descriptor_key):
        r"""!Load CSV data for a descriptor and add to unified cache"""
        try:
            if not os.path.isfile(csv_path):
                logging.error("CSV file not found: %s", csv_path)
                return

            csv_count = 0
            with open(csv_path, 'r', encoding='utf-8') as csvfile:
                reader = csv.DictReader(csvfile)
                for row in reader:
                    # Set default values if columns are missing
                    entry = {
                        'for': str(row.get('for', '')),
                        'add': row.get('add', ''),
                        'isRegex': row.get('isRegex', 'false').lower() == 'true'  # Default: False
                    }
                    self.unified_cache[descriptor_key].append(entry)
                    csv_count += 1

            logging.info("Loaded %d entries from CSV: %s for %s", csv_count, csv_path, descriptor_key)

        except Exception as e:
            logging.error("Error loading CSV file %s: %s", csv_path, str(e))

    def _find_description(self, descriptor_key, scan_value, bw_packet):
        r"""!Find matching description for a scan value with Regex group support."""
        descriptions = self.unified_cache.get(descriptor_key, [])
        scan_value_str = str(scan_value)

        # Search for matching description
        for desc in descriptions:
            description_text = desc.get('add', '')
            match_pattern = desc.get('for', '')
            is_regex = desc.get('isRegex', False)

            if is_regex:
                # Regex matching
                try:
                    match = re.search(match_pattern, scan_value_str)
                    if match:
                        # Expand regex groups (\1, \2) in the description
                        expanded_description = match.expand(description_text)

                        # Replace standard wildcards like {TONE}
                        final_description = self._replace_wildcards(expanded_description, bw_packet)

                        logging.debug("Regex match '%s' -> '%s' for descriptor '%s'",
                                      match_pattern, final_description, descriptor_key)
                        return final_description
                except re.error as e:
                    logging.error("Invalid regex pattern '%s': %s", match_pattern, str(e))
                    continue
            else:
                # Exact match
                if match_pattern == scan_value_str:
                    # Replace standard wildcards like {TONE}
                    final_description = self._replace_wildcards(description_text, bw_packet)
                    logging.debug("Exact match '%s' -> '%s' for descriptor '%s'",
                                  match_pattern, final_description, descriptor_key)
                    return final_description

        return None

    def _replace_wildcards(self, text, bw_packet):
        r"""!Replace all available wildcards in description text dynamically."""
        if not text or '{' not in text:
            return text

        result = text

        # Search for wildcards in the format {KEY} and replace them with values from the bw_packet
        found_wildcards = re.findall(r"\{([A-Z0-9_]+)\}", result)

        for key in found_wildcards:
            key_lower = key.lower()
            value = bw_packet.get(key_lower)

            if value is not None:
                result = result.replace(f"{{{key}}}", str(value))
                logging.debug("Replaced wildcard {%s} with value '%s'", key, value)

        return result

    def doWork(self, bwPacket):
        r"""!start an run of the module.

        @param bwPacket: A BOSWatch packet instance"""
        logging.debug("Processing packet with mode: %s", bwPacket.get("mode"))

        # Process each descriptor configuration
        for descriptor_config in self.config:
            scan_field = descriptor_config.get("scanField")
            descr_field = descriptor_config.get("descrField")
            descriptor_key = f"{scan_field}_{descr_field}"

            logging.debug("Processing descriptor: scanField='%s', descrField='%s'", scan_field, descr_field)

            # Check if scanField is present in packet
            scan_value = bwPacket.get(scan_field)
            if scan_value is None:
                logging.debug("scanField '%s' not found in packet, skipping", scan_field)
                continue  # scanField not available in this packet - try next descriptor

            # Set default value (content of scanField)
            bwPacket.set(descr_field, str(scan_value))
            logging.debug("Set default value '%s' for field '%s'", scan_value, descr_field)

            # Search for matching description in unified cache
            description = self._find_description(descriptor_key, scan_value, bwPacket)

            if description:
                bwPacket.set(descr_field, description)
                logging.info("Description set: '%s' -> '%s'", scan_value, description)
            else:
                logging.debug("No description found for value '%s' in field '%s'", scan_value, scan_field)

        logging.debug("Returning modified packet")
        return bwPacket

    def onUnload(self):
        r"""!Called by destruction of the plugin"""
        pass