import subprocess
import sys
import os
from collections import Counter

SUBPROGRAM_PATH = "./file-analyzer"

def most_common_in_list(searched_list, key):
    return Counter(key(el) for el in searched_list).most_common(1)

def summarize(analyses):
    char_counter = most_common_in_list(analyses, lambda x: x['most_common_char'])
    word_counter = most_common_in_list(analyses, lambda x: x['most_common_word'])
    return {
        'total_files_read': len(analyses),
        'chars_total': sum(analysis['chars_total'] for analysis in analyses),
        'words_total': sum(analysis['words_total'] for analysis in analyses),
        'rows_total': sum(analysis['rows_total'] for analysis in analyses),
        'most_common_char': char_counter[0][0] if len(char_counter) != 0 else " ",
        'most_common_word': word_counter[0][0] if len(word_counter) != 0 else "",

    }

def main(path):
    analyzedFiles = []

    try:
        process = subprocess.Popen(
            [SUBPROGRAM_PATH],
            stdin=subprocess.PIPE,
            stdout=subprocess.PIPE,
            text=True
        )
    except:
        print("Could not open analyzer!")
        exit(1)


    for dirpath, dirs, files in os.walk(path):
        for filename in files:
            path = os.path.join(dirpath, filename)

            print(path, file=process.stdin)
            process.stdin.flush()
            output = process.stdout.readline()

            data = output.strip().split("\t")
            if len(data) != 6:
                # error response
                print(data[0])
                continue

            analysis = {
                'path': data[0],
                'chars_total': int(data[1]),
                'words_total': int(data[2]),
                'rows_total': int(data[3]),
                'most_common_char': data[4][1:-1],
                'most_common_word': data[5][1:-1]
            }
            analyzedFiles.append(analysis)

    process.terminate()

    summary = summarize(analyzedFiles)

    print(f"Number of read files: {summary['total_files_read']}" )
    print(f"Total characters in all files: {summary['chars_total']}" )
    print(f"Total words in all files: {summary['words_total']}" )
    print(f"Total rows in all files: {summary['rows_total']}" )
    print(f"Most common character between files: '{summary['most_common_char']}'" )
    print(f"Most common word between files: \"{summary['most_common_word']}\"" )



if __name__ == "__main__":
    if len(sys.argv) != 2:
        print(f"Usage: {sys.argv[0]} <directory>")
        exit(1)    
    if not os.path.exists(sys.argv[1]):
        print(f"Path {sys.argv[1]} does not exist!")
        exit(1)
    if not os.path.isdir(sys.argv[1]):
        print(f"Path {sys.argv[1]} is not a directory!")
        exit(1)
    main(sys.argv[1])