""" Script used to tag the data with POS tags. """

import os
import re
from transformers import AutoTokenizer

import nltk, sys

TOKENIZER_NAME = 'cambridge-climb/CamBabyTokenizer-8192'

UNSUPERVISED_POS_TAG_MAP = {
   "and" : 'CONJ',
   "|" : 'NOUN',
   "states" : 'NOUN',
   "school" : 'NOUN',
   ".\"" : '.',
   "-" : '.',
   "five" : 'NUM',
   "1" : 'NUM',
   "they" : 'PRON',
   "of" : 'ADP',
   "are" : 'VERB',
   "(" : '.',
   "american" : 'ADJ',
   "'s" : 'VERB',
   "\"" : 'NOUN',
   "the" : 'DET',
   "a" : 'DET',
   "after" : 'ADP',
   "th" : 'NOUN',
   "good" : 'ADJ',
   "her" : 'PRON',
   "night" : 'NOUN',
   "to" : 'PRT',
   "used" : 'VERB',
   "," : '.',
   "sir" : 'NOUN',
   "tell" : 'VERB',
   "lot" : 'NOUN',
   "amp" : 'NOUN',
   "doing" : 'VERB'
}

def tag_with_nltk(text, en_ptb_map):
    """ Given a list of text, tag each word with its POS tag using NLTK """
    new_lines = []
    for line in text:
        tokens = line.split()
        tagged = nltk.pos_tag(tokens)
        # Map the NLTK PTB tags to the universal tags
        tagged = [(token, en_ptb_map[tag]) for (token, tag) in tagged]
        new_lines.append(tagged)
    return new_lines

def write_to_file(tagged, output_file):
    """ Given a list of tagged lines, write them to the given output file """
    with open(output_file, 'w') as f:
        for line in tagged:
            for token, tag in line:
                f.write(f'{token}__<label>__{tag} ')
            f.write('\n')

def tokenize_lines(text, tokenizer):
    new_lines = []
    for line in text:
        tokens = tokenizer.backend_tokenizer.pre_tokenizer.pre_tokenize_str(line)
        tokens = [t[0].replace("Ġ", "").replace('Ċ','\n') for t in tokens]
        new_lines.append(' '.join(tokens))
    return new_lines

def get_tags_from_file(file):
    with open(file, 'r') as f:
        lines = f.readlines()

    gold_tagged_lines = []
    pred_tagged_lines = []
    gold_tagged = []
    pred_tagged = []
    total = 0
    correct = 0
    for line in lines:
        line = line.strip()
        if line == '':
            gold_tagged_lines.append(gold_tagged)
            pred_tagged_lines.append(pred_tagged)
            gold_tagged = []
            pred_tagged = []
        else:
            token, gold_tag, _, pred_tag = line.strip().split(' ')
            gold_tagged.append((token, gold_tag))
            # Use the manual map to map the predicted tags to the universal tags
            pred_tagged.append((token, UNSUPERVISED_POS_TAG_MAP[pred_tag]))
            total += 1
            if gold_tag == UNSUPERVISED_POS_TAG_MAP[pred_tag]:
                correct += 1
    print(f'    Unsupervised Tagging Accuracy: {correct/total}')

    return gold_tagged_lines, pred_tagged_lines

def write_tagged_lines(filename, text, tagged_lines):
    with open(filename, 'w') as f:
        # Write the filename as the first line
        f.write(filename.split('/')[-1] + '\n')
        for line, tagged in zip(text, tagged_lines):
            f.write(line)
            f.write(' '.join([f'{token}__<label>__{tag}' for token, tag in tagged]) + '\n')


FOLDERS = ['10M', '100M', 'dev', 'test']
SECTION = "original"
RUN_UNSUPERVISED_TAGGER = True

if __name__ == "__main__":

    tokenizer = AutoTokenizer.from_pretrained(TOKENIZER_NAME)

    # Read all text files from directory "BabyLM"
    all_files = []
    for folder in FOLDERS:
        for root, dirs, files in os.walk(f"{SECTION}/{folder}"):
            for file in files:
                if file.endswith(".txt"):
                    all_files.append(os.path.join(root, file))

    # Get map from PTB tags to universal tags
    en_ptb_map = {}
    with open('en-ptb.map', 'r') as f:
        for line in f.readlines():
            (key, val) = line.split()
            en_ptb_map[key] = val

    for file in all_files:
        print(file)
        with open(file, 'r') as f:
            lines = f.readlines()[1:]
            lines = [line.strip()+'\n' for line in lines if line.strip() != '']

        tagged_file = file.replace(f'{SECTION}', f'{SECTION}_tagged')
        gold_tagged_file = file.replace(f'{SECTION}', f'{SECTION}_tagged_gold')

        # 1. Tokenize the lines in the text, tag with universal tags and write to tmp file
        tokenized = tokenize_lines(lines, tokenizer)
        tagged = tag_with_nltk(tokenized, en_ptb_map)

        if not RUN_UNSUPERVISED_TAGGER:
            # Save the gold tags
            gold_tagged_lines = tagged
            os.makedirs(os.path.dirname(gold_tagged_file), exist_ok=True)
            write_tagged_lines(gold_tagged_file, lines, tagged)
            continue

        # 2. Run the unsupervised tagger on the tmp file
        write_to_file(tagged, 'tmp.txt')
        os.system(f'./../anchor/hmm --output ../pos_tagging/10M_train_30_extended --data tmp.txt --pred tmp_tagged.txt')

        # 3. Get the gold tags and predicted tags
        gold_tagged_lines, pred_tagged_lines = get_tags_from_file('tmp_tagged.txt')
        os.remove('tmp.txt')
        os.remove('tmp_tagged.txt')
        
        assert len(gold_tagged_lines) == len(pred_tagged_lines) == len(lines)

        # 4. Write the tagged lines to the original file
        os.makedirs(os.path.dirname(tagged_file), exist_ok=True)
        write_tagged_lines(tagged_file, lines, pred_tagged_lines)
        os.makedirs(os.path.dirname(gold_tagged_file), exist_ok=True)
        write_tagged_lines(gold_tagged_file, lines, gold_tagged_lines)