src/processors/lottery_processor.py

"""
Lottery dataset processor.

Processes lottery number prediction data with mixed row types:
- Lottery rows: 9 columns (user_id, timestamp, 5 numbers, 1 mega)
- Immediate drawing rows: 16 columns (adds trial_num, matches, 5 target numbers, 1 target mega)
"""

from pathlib import Path
from typing import List, Dict, Any, Optional
from datetime import datetime
import pandas as pd
import re

from ..core.base_classes import BaseProcessor
from ..core.config import Config
from ..core.exceptions import ProcessorError
from ..cleaners.encoding_cleaner import EncodingCleaner
from ..cleaners.temporal_parser import TemporalParser


class LotteryProcessor(BaseProcessor):
    """
    Processes Lottery data.

    Format: Mixed row types in same file
    - Lottery rows: user picks 5 numbers (1-47) + 1 mega (1-27)
    - Immediate rows: adds trial_num, matches, and 6 target numbers
    """

    BATCH_DELIMITER_CLEAN = False  # mixed row formats (9 and 16 columns), no delimiter standardization

    # File discovery patterns
    FILE_PATTERNS = ['lot*.dat']

    # Unified output schema
    COLUMNS_UNIFIED = [
        'user_id', 'timestamp', 'row_type',
        'num1', 'num2', 'num3', 'num4', 'num5', 'mega',
        'trial_num', 'matches',
        'target1', 'target2', 'target3', 'target4', 'target5', 'target_mega',
        'file_date', 'source_file', 'source_row_number'
    ]

    def __init__(self, config: Config):
        """
        Initialize Lottery processor.

        Args:
            config: Configuration object
        """
        super().__init__(config, 'lottery')

        # Initialize cleaners
        self.encoding_cleaner = EncodingCleaner(config, self.errata_logger)
        self.temporal_parser = TemporalParser(config, self.errata_logger)

        # Statistics
        self.stats = {
            'files_processed': 0,
            'files_failed': 0,
            'rows_total': 0,
            'rows_lottery': 0,
            'rows_immediate': 0,
            'rows_valid': 0,
            'rows_invalid': 0
        }

    def extract_file_date(self, file_path: Path) -> Optional[datetime]:
        """
        Extract date from filename (lotYYMMDD.dat or lotYYMMDDS.dat).

        Args:
            file_path: Path to file

        Returns:
            datetime object or None
        """
        match = re.search(r'lot(\d{6})', file_path.name)
        if not match:
            return None

        return self.temporal_parser.extract_date_from_filename(file_path.name)

    def process_file(self, file_path: Path, pre_cleaned_text: Optional[str] = None) -> Optional[pd.DataFrame]:
        """
        Process a single Lottery file.

        Args:
            file_path: Path to file
            pre_cleaned_text: Pre-cleaned text from parallel batch cleaning.
                If None, cleans the file inline (backward compat).

        Returns:
            DataFrame or None if processing fails
        """
        try:
            # Use pre-cleaned text if available, otherwise clean inline
            if pre_cleaned_text is not None:
                text = pre_cleaned_text
            else:
                text = self.encoding_cleaner.clean(file_path)

            # DON'T use delimiter cleaner - Lottery has mixed row formats (9 and 16 columns)
            # Parse manually to handle variable column counts
            from io import StringIO
            import csv

            reader = csv.reader(StringIO(text), skipinitialspace=True)
            rows = list(reader)

            if not rows:
                self.errata_logger.log_error(
                    'empty_file',
                    'File is empty after CSV parsing - entire file omitted',
                    file_path=str(file_path),
                    scope='file'
                )
                return None

            # Convert to DataFrame with max columns
            df = pd.DataFrame(rows)

            if df.empty:
                self.errata_logger.log_error(
                    'empty_file',
                    'File is empty or has no valid rows - entire file omitted',
                    file_path=str(file_path),
                    scope='file'
                )
                return None

            # Detect row types based on column count
            # Lottery rows: 8 columns (user, timestamp, 5 nums, mega)
            # Immediate rows: 16 columns (adds trial, matches, 5 targets, target_mega)
            file_date = self.extract_file_date(file_path)
            col_counts = df.notna().sum(axis=1)
            is_lottery = col_counts == 8
            is_immediate = col_counts == 16

            # Count row types
            self.stats['rows_lottery'] += is_lottery.sum()
            self.stats['rows_immediate'] += is_immediate.sum()

            # Create unified DataFrame
            result_df = pd.DataFrame(index=df.index)

            # Common columns for all rows
            result_df['user_id'] = df.iloc[:, 0]
            result_df['file_date'] = file_date

            # Add audit columns (source file and row numbers)
            result_df['source_file'] = file_path.name
            result_df['source_row_number'] = range(1, len(result_df) + 1)

            # Parse timestamps
            result_df['timestamp'] = self.temporal_parser.parse_dates_vectorized(
                df.iloc[:, 1], file_path=str(file_path)
            )

            # Process Lottery rows (8 columns)
            result_df.loc[is_lottery, 'row_type'] = 'lottery'
            result_df.loc[is_lottery, 'num1'] = self.to_numeric_logged(df.loc[is_lottery].iloc[:, 2], 'num1', str(file_path))
            result_df.loc[is_lottery, 'num2'] = self.to_numeric_logged(df.loc[is_lottery].iloc[:, 3], 'num2', str(file_path))
            result_df.loc[is_lottery, 'num3'] = self.to_numeric_logged(df.loc[is_lottery].iloc[:, 4], 'num3', str(file_path))
            result_df.loc[is_lottery, 'num4'] = self.to_numeric_logged(df.loc[is_lottery].iloc[:, 5], 'num4', str(file_path))
            result_df.loc[is_lottery, 'num5'] = self.to_numeric_logged(df.loc[is_lottery].iloc[:, 6], 'num5', str(file_path))
            result_df.loc[is_lottery, 'mega'] = self.to_numeric_logged(df.loc[is_lottery].iloc[:, 7], 'mega', str(file_path))
            result_df.loc[is_lottery, 'trial_num'] = None
            result_df.loc[is_lottery, 'matches'] = None
            result_df.loc[is_lottery, 'target1'] = None
            result_df.loc[is_lottery, 'target2'] = None
            result_df.loc[is_lottery, 'target3'] = None
            result_df.loc[is_lottery, 'target4'] = None
            result_df.loc[is_lottery, 'target5'] = None
            result_df.loc[is_lottery, 'target_mega'] = None

            # Process Immediate rows (16 columns)
            result_df.loc[is_immediate, 'row_type'] = 'immediate'
            result_df.loc[is_immediate, 'num1'] = self.to_numeric_logged(df.loc[is_immediate].iloc[:, 2], 'num1', str(file_path))
            result_df.loc[is_immediate, 'num2'] = self.to_numeric_logged(df.loc[is_immediate].iloc[:, 3], 'num2', str(file_path))
            result_df.loc[is_immediate, 'num3'] = self.to_numeric_logged(df.loc[is_immediate].iloc[:, 4], 'num3', str(file_path))
            result_df.loc[is_immediate, 'num4'] = self.to_numeric_logged(df.loc[is_immediate].iloc[:, 5], 'num4', str(file_path))
            result_df.loc[is_immediate, 'num5'] = self.to_numeric_logged(df.loc[is_immediate].iloc[:, 6], 'num5', str(file_path))
            result_df.loc[is_immediate, 'mega'] = self.to_numeric_logged(df.loc[is_immediate].iloc[:, 7], 'mega', str(file_path))
            result_df.loc[is_immediate, 'trial_num'] = self.to_numeric_logged(df.loc[is_immediate].iloc[:, 8], 'trial_num', str(file_path))
            result_df.loc[is_immediate, 'matches'] = self.to_numeric_logged(df.loc[is_immediate].iloc[:, 9], 'matches', str(file_path))
            result_df.loc[is_immediate, 'target1'] = self.to_numeric_logged(df.loc[is_immediate].iloc[:, 10], 'target1', str(file_path))
            result_df.loc[is_immediate, 'target2'] = self.to_numeric_logged(df.loc[is_immediate].iloc[:, 11], 'target2', str(file_path))
            result_df.loc[is_immediate, 'target3'] = self.to_numeric_logged(df.loc[is_immediate].iloc[:, 12], 'target3', str(file_path))
            result_df.loc[is_immediate, 'target4'] = self.to_numeric_logged(df.loc[is_immediate].iloc[:, 13], 'target4', str(file_path))
            result_df.loc[is_immediate, 'target5'] = self.to_numeric_logged(df.loc[is_immediate].iloc[:, 14], 'target5', str(file_path))
            result_df.loc[is_immediate, 'target_mega'] = self.to_numeric_logged(df.loc[is_immediate].iloc[:, 15], 'target_mega', str(file_path))

            # Validate and clean
            result_df = self.validate_dataframe(result_df, file_path)

            # Ensure all unified columns exist
            for col in self.COLUMNS_UNIFIED:
                if col not in result_df.columns:
                    result_df[col] = None

            # Reorder to unified schema
            result_df = result_df[self.COLUMNS_UNIFIED]

            self.stats['files_processed'] += 1
            self.stats['rows_valid'] += len(result_df)
            return result_df

        except Exception as e:
            import traceback
            self.errata_logger.log_error(
                'file_processing_failed',
                f'{type(e).__name__}: {e} - entire file omitted',
                file_path=str(file_path),
                scope='file',
                context={'traceback': traceback.format_exc()},
            )
            return None

    def validate_dataframe(self, df: pd.DataFrame, file_path: Path) -> pd.DataFrame:
        """
        Validate and clean DataFrame.

        Args:
            df: Input DataFrame
            file_path: Source file path

        Returns:
            Cleaned DataFrame
        """
        initial_count = len(df)
        valid_mask = pd.Series([True] * len(df), index=df.index)


        # Validate user_id length
        if 'user_id' in df.columns:
            long_users = df['user_id'].str.len() > 64
            if long_users.any():
                valid_mask &= ~long_users
                self.errata_logger.log_error(
                    'user_id_too_long',
                    f'{long_users.sum()} rows with user_id > 64 chars',
                    file_path=str(file_path),
                    scope='row'
                )

        # Validate lottery numbers (1-47)
        for col in ['num1', 'num2', 'num3', 'num4', 'num5', 'target1', 'target2', 'target3', 'target4', 'target5']:
            if col in df.columns:
                df[col] = self.to_numeric_logged(df[col], col, str(file_path))
                invalid = (df[col].notna()) & ((df[col] < 1) | (df[col] > 47))
                if invalid.any():
                    valid_mask &= ~invalid
                    self.errata_logger.log_error(
                        f'{col}_out_of_range',
                        f'{invalid.sum()} rows with {col} not in 1-47',
                        file_path=str(file_path),
                        scope='row'
                    )

        # Validate mega numbers (1-27)
        for col in ['mega', 'target_mega']:
            if col in df.columns:
                df[col] = self.to_numeric_logged(df[col], col, str(file_path))
                invalid = (df[col].notna()) & ((df[col] < 1) | (df[col] > 27))
                if invalid.any():
                    valid_mask &= ~invalid
                    self.errata_logger.log_error(
                        f'{col}_out_of_range',
                        f'{invalid.sum()} rows with {col} not in 1-27',
                        file_path=str(file_path),
                        scope='row'
                    )

        # Validate matches (0-6)
        if 'matches' in df.columns:
            df['matches'] = self.to_numeric_logged(df['matches'], 'matches', str(file_path))
            invalid = (df['matches'].notna()) & ((df['matches'] < 0) | (df['matches'] > 6))
            if invalid.any():
                valid_mask &= ~invalid
                self.errata_logger.log_error(
                    'matches_out_of_range',
                    f'{invalid.sum()} rows with matches not in 0-6',
                    file_path=str(file_path),
                    scope='row'
                )

        # Filter to valid rows
        df_valid = df[valid_mask].copy()

        invalid_count = initial_count - len(df_valid)
        if invalid_count > 0:
            self.errata_logger.log_file_summary(
                str(file_path),
                'partial',
                initial_count,
                len(df_valid),
                invalid_count
            )

        return df_valid

    def get_stats(self) -> Dict[str, Any]:
        """Get processing statistics."""
        return self.stats.copy()