from sqlalchemy.orm import Session
from app.db.models import File, CardTCGPlayer, Price, TCGPlayerInventory
from app.services.util._dataframe import TCGPlayerPricingRow, DataframeUtil
from app.services.file import FileService
from app.services.tcgplayer import TCGPlayerService
from uuid import uuid4
from app.db.utils import db_transaction
from typing import List, Dict
from decimal import Decimal, ROUND_HALF_UP
import pandas as pd
import logging 

logger = logging.getLogger(__name__)


class PricingService:
    def __init__(self, db: Session, file_service: FileService, tcgplayer_service: TCGPlayerService):
        self.db = db
        self.file_service = file_service
        self.tcgplayer_service = tcgplayer_service
        self.df_util = DataframeUtil()

    # function for taking a tcgplayer pricing export with all set ids and loading it into the price table
    # can be run as needed or scheduled
    def get_pricing_export_content(self, file: File = None) -> bytes:
        if file:
            file_content = self.file_service.get_file_content(file.id)
        else:
            file = self.tcgplayer_service.get_pricing_export_for_all_products()
            file_content = self.file_service.get_file_content(file.id)
        return file_content
    
    def load_pricing_csv_content_to_db(self, file_content: bytes):
        try:
            if not file_content:
                raise ValueError("No file content provided")
                
            price_types = {
                "tcg_market_price": "tcg_market_price",
                "tcg_direct_low": "tcg_direct_low",
                "tcg_low_price_with_shipping": "tcg_low_price_with_shipping",
                "tcg_low_price": "tcg_low_price",
                "tcg_marketplace_price": "listed_price"
            }
            
            required_columns = ["tcgplayer_id"] + list(price_types.keys())
            df = self.df_util.csv_bytes_to_df(file_content)
            
            # Validate columns
            missing_columns = set(required_columns) - set(df.columns)
            if missing_columns:
                raise ValueError(f"Missing required columns: {missing_columns}")

            # Process in true batches
            for i in range(0, len(df), 1000):
                batch = df.iloc[i:i+1000]
                pricing_rows = [TCGPlayerPricingRow(row) for _, row in batch.iterrows()]
                
                # Query cards for this batch only
                tcgplayer_ids = [row.tcgplayer_id for row in pricing_rows]
                batch_cards = self.db.query(CardTCGPlayer).filter(
                    CardTCGPlayer.tcgplayer_id.in_(tcgplayer_ids)
                ).all()
                
                existing_cards = {card.tcgplayer_id: card for card in batch_cards}
                
                new_prices = []
                for row in pricing_rows:
                    if row.tcgplayer_id not in existing_cards:
                        continue
                        
                    card = existing_cards[row.tcgplayer_id]
                    row_prices = [
                        Price(
                            id=str(uuid4()),
                            product_id=card.product_id,
                            marketplace_id=None,
                            type=price_type,  # Added missing price_type
                            price=getattr(row, col_name)
                        )
                        for col_name, price_type in price_types.items()
                        if getattr(row, col_name, None) is not None and getattr(row, col_name) > 0
                    ]
                    new_prices.extend(row_prices)
                
                # Save each batch separately
                if new_prices:
                    with db_transaction(self.db):
                        self.db.bulk_save_objects(new_prices)
                        
        except Exception as e:
            raise e  # Consider adding logging here


    def cron_load_prices(self, file: File = None):
        file_content = self.get_pricing_export_content(file)
        self.tcgplayer_service.load_tcgplayer_cards(file_content)
        self.load_pricing_csv_content_to_db(file_content)
    
    def get_all_prices_for_products(self, product_ids: List[str]) -> Dict[str, Dict[str, float]]:
        all_prices = self.db.query(Price).filter(
            Price.product_id.in_(product_ids)
        ).all()
        
        price_lookup = {}
        for price in all_prices:
            if price.product_id not in price_lookup:
                price_lookup[price.product_id] = {}
            price_lookup[price.product_id][price.type] = price.price
        return price_lookup

    def apply_price_to_df_columns(self, row: pd.Series, price_lookup: Dict[str, Dict[str, float]]) -> pd.Series:
        product_prices = price_lookup.get(row['product_id'], {})
        for price_type, price in product_prices.items():
            row[price_type] = price
        return row

    def default_pricing_algo(self, row: pd.Series) -> pd.Series:
        """Default pricing algorithm with complex pricing rules"""
        
        # Convert input values to Decimal for precise arithmetic
        tcg_low = Decimal(str(row.get('tcg_low_price'))) if not pd.isna(row.get('tcg_low_price')) else None
        tcg_low_shipping = Decimal(str(row.get('tcg_low_price_with_shipping'))) if not pd.isna(row.get('tcg_low_price_with_shipping')) else None
        tcg_market_price = Decimal(str(row.get('tcg_market_price'))) if not pd.isna(row.get('tcg_market_price')) else None
        total_quantity = str(row.get('total_quantity')) if not pd.isna(row.get('total_quantity')) else "0"
        added_quantity = str(row.get('add_to_quantity')) if not pd.isna(row.get('add_to_quantity')) else "0"
        quantity = int(total_quantity) + int(added_quantity)
        
        if tcg_market_price is None:
            logger.warning(f"Missing pricing data for row: {row}")
            row['new_price'] = None
            return row
            
        # Define precision for rounding
        TWO_PLACES = Decimal('0.01')
        
        # Apply pricing rules
        if tcg_market_price < Decimal('1') and tcg_market_price > Decimal('0.25'):
            new_price = tcg_market_price * Decimal('1.25')
        elif tcg_market_price < Decimal('0.25'):
            new_price = Decimal('0.25')
        elif tcg_market_price < Decimal('5'):
            new_price = tcg_market_price * Decimal('1.08')
        elif tcg_market_price < Decimal('10'):
            new_price = tcg_market_price * Decimal('1.06')
        elif tcg_market_price < Decimal('20'):
            new_price = tcg_market_price * Decimal('1.0125')
        elif tcg_market_price < Decimal('50'):
            new_price = tcg_market_price * Decimal('0.99')
        elif tcg_market_price < Decimal('100'):
            new_price = tcg_market_price * Decimal('0.98')
        else:
            new_price = tcg_market_price * Decimal('1.09')
        
        if new_price < Decimal('0.25'):
            new_price = Decimal('0.25')
        
        if quantity > 3:
            new_price = new_price * Decimal('1.1')
        
        # Ensure exactly 2 decimal places
        new_price = new_price.quantize(TWO_PLACES, rounding=ROUND_HALF_UP)
        
        # Convert back to float or string as needed for your dataframe
        row['new_price'] = float(new_price)
        return row

    def apply_pricing_algo(self, row: pd.Series, pricing_algo: callable = None) -> pd.Series:
        """Modified to handle the pricing algorithm as an instance method"""
        if pricing_algo is None:
            pricing_algo = self.default_pricing_algo
        return pricing_algo(row)

    def generate_tcgplayer_inventory_update_file_with_pricing(self, open_box_ids: List[str] = None) -> bytes:
        desired_columns = [
            'TCGplayer Id', 'Product Line', 'Set Name', 'Product Name', 
            'Title', 'Number', 'Rarity', 'Condition', 'TCG Market Price',
            'TCG Direct Low', 'TCG Low Price With Shipping', 'TCG Low Price',
            'Total Quantity', 'Add to Quantity', 'TCG Marketplace Price', 'Photo URL'
        ]
        
        if open_box_ids:
        # Get initial dataframe
            update_type = 'add'
            df = self.tcgplayer_service.open_box_cards_to_tcgplayer_inventory_df(open_box_ids)
        else:
            update_type = 'update'
            df = self.tcgplayer_service.get_inventory_df('live')
            # remove rows with total quantity of 0
            df = df[df['total_quantity'] != 0]
            tcgplayer_ids = df['tcgplayer_id'].unique().tolist()

            # Make a single query to get all matching records
            product_id_mapping = {
                card.tcgplayer_id: card.product_id 
                for card in self.db.query(CardTCGPlayer)
                .filter(CardTCGPlayer.tcgplayer_id.in_(tcgplayer_ids))
                .all()
            }

            # Map the ids using the dictionary
            df['product_id'] = df['tcgplayer_id'].map(product_id_mapping)
        
        price_lookup = self.get_all_prices_for_products(df['product_id'].unique())
        
        # Apply price columns
        df = df.apply(lambda row: self.apply_price_to_df_columns(row, price_lookup), axis=1)
        
        # Apply pricing algorithm
        df = df.apply(self.apply_pricing_algo, axis=1)

        # if update type is update, remove rows where new_price == listed_price
        if update_type == 'update':
            df = df[df['new_price'] != df['listed_price']]
        
        # Set marketplace price
        df['TCG Marketplace Price'] = df['new_price']

        df['Title'] = ''

        column_mapping = {
            'tcgplayer_id': 'TCGplayer Id',
            'product_line': 'Product Line', 
            'set_name': 'Set Name',
            'product_name': 'Product Name',
            'title': 'Title',
            'number': 'Number',
            'rarity': 'Rarity',
            'condition': 'Condition',
            'tcg_market_price': 'TCG Market Price',
            'tcg_direct_low': 'TCG Direct Low',
            'tcg_low_price_with_shipping': 'TCG Low Price With Shipping',
            'tcg_low_price': 'TCG Low Price',
            'total_quantity': 'Total Quantity',
            'add_to_quantity': 'Add to Quantity',
            'photo_url': 'Photo URL'
        }
        df = df.rename(columns=column_mapping)
        
        # Now do your column selection
        df = df[desired_columns]

        if update_type == 'update':
            with db_transaction(self.db):
                self.db.query(TCGPlayerInventory).delete()
                self.db.flush()
                # copy df to modify before inserting
                df_copy = df.copy()
                df_copy['id'] = df_copy.apply(lambda x: str(uuid4()), axis=1)
                # rename columns lowercase no space
                df_copy.columns = df_copy.columns.str.lower().str.replace(' ', '_')
                for index, row in df_copy.iterrows():
                    tcgplayer_inventory = TCGPlayerInventory(**row.to_dict())
                    self.db.add(tcgplayer_inventory)

        # remove any rows with no price
        #df = df[df['TCG Marketplace Price'] != 0]
        #df = df[df['TCG Marketplace Price'].notna()]
        
        # Convert to CSV bytes
        csv_bytes = self.df_util.df_to_csv_bytes(df)

        return csv_bytes