import logging
import re
from collections import defaultdict
from typing import List, Optional

logger = logging.getLogger(__name__)

class KeywordsService:
    def __init__(self):
        self.candidates_map = defaultdict(list)
        self.pattern_map = {}
        self.normalized_pattern_map = {}
        self.normalized_sorted_pattern_map = {}
        self.required_words = {}
        self.aliases_map = {}
        self.bottle_aliases_map = {}
        self.vintages_map = {}
        self.bottle_sizes = []
        self.bottle_exclusions = []
        self.bottles_map = {}

    def prepare(self):
        self.map_candidates()
        self.map_aliases()
        self.map_bottle_aliases()
        self.map_vintages()

    def get_wine_candidates(self, word: str) -> List[str]:
        return self.candidates_map.get(word, [])

    def get_pattern(self, wine_db_id: str) -> str:
        return self.pattern_map.get(wine_db_id, "")

    def get_normalized_sorted_pattern(self, wine_db_id: str) -> str:
        return self.normalized_sorted_pattern_map.get(wine_db_id, "")

    def get_normalized_pattern(self, wine_db_id: str) -> str:
        return self.normalized_pattern_map.get(wine_db_id, "")

    def get_required_words(self, wine_db_id: str) -> List[str]:
        return self.required_words.get(wine_db_id, [])

    def get_bottle_id(self, size: str) -> Optional[str]:
        return self.bottle_aliases_map.get(size.lower()) if size else None

    def get_bottle_size(self, bottle_id: str) -> Optional[str]:
        return self.bottles_map.get(bottle_id)

    def get_vintage_id(self, year: str) -> Optional[str]:
        for key, value in self.vintages_map.items():
            if value.lower() == year.lower():
                return key
        return None

    def get_vintage(self, vintage_id: str) -> Optional[str]:
        return self.vintages_map.get(vintage_id)

    def parse_bottle_size(self, text: str) -> Optional[str]:
        if not text:
            return None
        for name in self.bottle_aliases_map.keys():
            if re.search(fr"(^|\s|[^\w]){re.escape(name)}($|\s|[^\w])", text, flags=re.IGNORECASE):
                return name
        return None

    def get_candidate_list(self, name: str) -> List[str]:
        candidate_list = []
        if not name:
            return candidate_list
        words = list(set(name.split()))
        for word in words:
            candidate_list += self.get_wine_candidates(word)
            for i in range(len(word), 0, -1):
                sub_token = word[:i] + "*"
                candidate_list += self.get_wine_candidates(sub_token)
        return list(set(candidate_list))

    def replace_aliases(self, input_text: str) -> str:
        if not input_text:
            return ""
        text = input_text.lower()
        for k, v in self.aliases_map.items():
            pattern = fr"(^|\s|[^\w]){re.escape(k)}($|\s|[^\w])"
            text = re.sub(pattern, f" {v} ", text)
        return re.sub(r"\s+", " ", text).strip()

    def remove_size_info(self, input_text: str) -> str:
        if not input_text:
            return ""
        text = input_text.lower()
        for size in self.bottle_sizes:
            if size not in self.bottle_exclusions:
                pattern = fr"(^|\s|[^\w]){re.escape(size)}($|\s|[^\w])"
                text = re.sub(pattern, " ", text)
        return text.strip()

    # The methods below need real data source implementations
    def map_candidates(self):
        logger.info("Mapping candidates... [placeholder]")
        # Map candidates from database or file

    def map_aliases(self):
        logger.info("Mapping aliases... [placeholder]")
        # Populate self.aliases_map from DB or config

    def map_bottle_aliases(self):
        logger.info("Mapping bottle aliases... [placeholder]")
        # Populate self.bottle_aliases_map and others

    def map_vintages(self):
        logger.info("Mapping vintages... [placeholder]")
        # Populate self.vintages_map