import os
import argparse
from multiprocessing import Pool, cpu_count, Manager
import json
from collections import defaultdict
from functools import partial
from tqdm import tqdm

def count_words_and_docs_in_field(file_path, field, progress_queue):
    """
    Count words and documents in the specified field of a JSON or JSONL file.
    """
    word_count = 0
    doc_count = 0
    try:
        with open(file_path, 'r', encoding='utf-8') as f:
            if file_path.endswith('.jsonl') or file_path.endswith('.json'):
                for line in f:
                    try:
                        record = json.loads(line.strip())
                        if isinstance(record, dict) and field in record:
                            word_count += len(str(record[field]).split())
                        doc_count += 1
                    except json.JSONDecodeError:
                        continue  # Skip invalid JSON lines
    except Exception as e:
        print(f"Error reading file {file_path}: {e}")

    # Notify progress
    if progress_queue is not None:
        progress_queue.put(1)

    return word_count, doc_count

def process_files(args):
    """
    Process a list of files and count words and documents in the specified field.
    """
    files, field, progress_queue = args
    # folder_stats = defaultdict(lambda: {"word_count": 0, "doc_count": 0})  # it won't pickle in multiprocessing
    folder_stats = defaultdict(partial(defaultdict, int))
    for file in files:
        folder = os.path.dirname(file)
        word_count, doc_count = count_words_and_docs_in_field(file, field, progress_queue)
        folder_stats[folder]["word_count"] += word_count
        folder_stats[folder]["doc_count"] += doc_count
    return folder_stats

def find_json_files(folder):
    """
    Recursively find all .json and .jsonl files in the given folder.
    """
    json_files = []
    for root, _, files in os.walk(folder):
        for file in files:
            if file.endswith('.json') or file.endswith('.jsonl'):
                json_files.append(os.path.join(root, file))
    return json_files

def merge_folder_stats(stats_list):
    """
    Merge statistics from multiple workers into a single dictionary.
    """
    merged_stats = defaultdict(lambda: {"word_count": 0, "doc_count": 0})
    for stats in stats_list:
        for folder, data in stats.items():
            merged_stats[folder]["word_count"] += data["word_count"]
            merged_stats[folder]["doc_count"] += data["doc_count"]
    return merged_stats

def print_markdown_table(stats, total_word_count, total_doc_count, output_file=None):
    """
    Print folder statistics as a markdown table and optionally save to a file.
    """
    lines = []
    lines.append("\n### Statistics Per Folder")
    lines.append("| Folder | Word Count | Document Count |")
    lines.append("|--------|------------|----------------|")
    for folder, data in sorted(stats.items()):
        lines.append(f"| {folder} | {data['word_count']:,} | {data['doc_count']:,} |")
    lines.append("| **Total** | **{:,}** | **{:,}** |".format(total_word_count, total_doc_count))

    # Print to console
    print("\n".join(lines))

    # Save to file if specified
    if output_file:
        with open(output_file, "w", encoding="utf-8") as f:
            f.write("\n".join(lines))
        print(f"\nMarkdown table saved to {output_file}")

def main():
    parser = argparse.ArgumentParser(description="Count words in a specific field of JSON or JSONL files recursively using multiprocessing.")
    parser.add_argument("folder", type=str, help="The folder containing .json or .jsonl files.")
    parser.add_argument("-f", "--field", type=str, default="text",
                        help="The field to count words in. Default is 'text'.")
    parser.add_argument("-w", "--num-workers", type=int, default=cpu_count(),
                        help="Number of parallel workers to use. Default is the number of CPU cores.")
    parser.add_argument("-o", "--output", type=str,
                        help="File path to save the markdown table. If not provided, only prints to console.")
    args = parser.parse_args()

    folder = args.folder
    field = args.field
    num_workers = args.num_workers
    output_file = args.output

    if not os.path.isdir(folder):
        print(f"Error: {folder} is not a valid directory.")
        return

    # Find all .json and .jsonl files
    json_files = find_json_files(folder)
    if not json_files:
        print("No .json or .jsonl files found in the specified folder.")
        return

    # Split files among workers
    files_per_worker = len(json_files) // num_workers
    chunks = [json_files[i:i + files_per_worker] for i in range(0, len(json_files), files_per_worker)]

    print(f"Found {len(json_files)} JSON files. Using {num_workers} workers to count words in the field '{field}'.")

    # Progress bar setup
    with Manager() as manager:
        progress_queue = manager.Queue()
        total_files = len(json_files)

        # Start a separate process for the progress bar
        with tqdm(total=total_files, desc="Processing Files", unit="file") as pbar:
            with Pool(processes=num_workers) as pool:
                # Pass the progress queue to each worker
                args = [(chunk, field, progress_queue) for chunk in chunks]
                results = pool.map_async(process_files, args)

                # Update the progress bar as files are processed
                processed_files = 0
                while processed_files < total_files:
                    progress_queue.get()
                    pbar.update(1)
                    processed_files += 1

                # Wait for all workers to complete
                results.wait()

        # Merge statistics from all workers
        folder_stats = merge_folder_stats(results.get())

    # Calculate totals
    total_word_count = sum(data["word_count"] for data in folder_stats.values())
    total_doc_count = sum(data["doc_count"] for data in folder_stats.values())

    # Print markdown table
    print_markdown_table(folder_stats, total_word_count, total_doc_count, output_file)

if __name__ == "__main__":
    main()