import json
import sys
from collections import Counter

input_filename = 'mtabvqa_query.jsonl'  # Changed to mtabqa_query.jsonl
output_filename = 'mtabqa_query_filtered.jsonl'
removed_filename = 'mtabqa_query_removed_one_table.jsonl'

print(f"Starting analysis of '{input_filename}'...")

try:
    with open(input_filename, 'r', encoding='utf-8') as infile, \
         open(output_filename, 'w', encoding='utf-8') as outfile, \
         open(removed_filename, 'w', encoding='utf-8') as removed_file:

        # Counters for statistics
        tables_count = Counter()
        kept_count = 0
        removed_count = 0
        error_count = 0
        skipped_lines = []

        for line_num, line in enumerate(infile, 1):
            try:
                # Remove potential leading/trailing whitespace
                stripped_line = line.strip()
                if not stripped_line:  # Skip empty lines
                    print(f"Warning: Skipping empty line {line_num}.", file=sys.stderr)
                    skipped_lines.append(line_num)
                    continue

                data = json.loads(stripped_line)

                # Check if 'table_image_ids' key exists and is a list
                if 'table_image_ids' in data and isinstance(data.get('table_image_ids'), list):
                    num_tables = len(data['table_image_ids'])
                    
                    # Update our counter
                    tables_count[num_tables] += 1

                    if num_tables > 1:
                        # Keep this line (write to output file)
                        outfile.write(stripped_line + '\n')
                        kept_count += 1
                    elif num_tables == 1:
                        # Remove this line (write to removed file)
                        removed_file.write(stripped_line + '\n')
                        removed_count += 1
                    else:  # num_tables == 0 or other unexpected cases
                        print(f"Info: Line {line_num} has zero tables. Skipping.", file=sys.stderr)
                        skipped_lines.append(line_num)
                else:
                    # Handle cases where 'table_image_ids' key is missing or not a list
                    print(f"Warning: Skipping line {line_num} due to missing or invalid 'table_image_ids' field.", file=sys.stderr)
                    error_count += 1
                    skipped_lines.append(line_num)

            except json.JSONDecodeError:
                print(f"Error: Could not decode JSON on line {line_num}. Skipping.", file=sys.stderr)
                error_count += 1
                skipped_lines.append(line_num)
            except Exception as e:
                print(f"An unexpected error occurred processing line {line_num}: {e}", file=sys.stderr)
                error_count += 1
                skipped_lines.append(line_num)

    # Print distribution of tables per question
    print("\n--- Table Distribution Statistics ---")
    print(f"Total questions processed: {sum(tables_count.values())}")
    
    for table_count in sorted(tables_count.keys()):
        count = tables_count[table_count]
        percentage = (count / sum(tables_count.values())) * 100
        print(f"Questions with {table_count} {'tables' if table_count != 1 else 'table'}: {count} ({percentage:.2f}%)")
    
    # Additional stats for multi-table questions
    multi_table_count = sum(tables_count[i] for i in tables_count if i > 1)
    multi_table_percentage = (multi_table_count / sum(tables_count.values())) * 100 if sum(tables_count.values()) > 0 else 0
    print(f"\nQuestions with 2+ tables: {multi_table_count} ({multi_table_percentage:.2f}%)")
    
    # Print standard summary
    print("\n--- Processing Summary ---")
    print(f"Successfully processed {line_num} lines from '{input_filename}'.")
    print(f"Kept {kept_count} entries (more than one table) in '{output_filename}'.")
    print(f"Removed {removed_count} entries (exactly one table) to '{removed_filename}'.")
    if error_count > 0:
        print(f"Encountered {error_count} errors (JSON decoding or invalid format).")
        print(f"Problematic line numbers: {skipped_lines}")
    print("--------------------------\n")


except FileNotFoundError:
    print(f"Error: Input file '{input_filename}' not found in the current directory.", file=sys.stderr)
    print("Please make sure the script is in the same directory as the .jsonl file or update the 'input_filename' variable.", file=sys.stderr)
except Exception as e:
    print(f"A critical error occurred during file operations: {e}", file=sys.stderr)