import xml.etree.ElementTree as ET
import csv
import pandas as pd
from pydub import AudioSegment
import re
import sys
from typing import List, Tuple, Dict

# Global dictionary to store custom character choices for each pinyin
custom_choices: Dict[str, str] = {}


def parse_xml(xml_content: str) -> List[Tuple[int, int, str]]:
    root = ET.fromstring(xml_content)

    time_order = {ts.get('TIME_SLOT_ID'): int(ts.get('TIME_VALUE'))
                  for ts in root.iter('TIME_SLOT')}

    tier_data = []
    for tier in root.iter('TIER'):
        tier_id = tier.get('TIER_ID')
        if not ('-' in tier_id) and (tier_id == 'G' or tier_id == 'E'):
            for annotation in tier.iter('ALIGNABLE_ANNOTATION'):
                start_time = time_order[annotation.get('TIME_SLOT_REF1')]
                end_time = time_order[annotation.get('TIME_SLOT_REF2')]
                text = annotation.find('./ANNOTATION_VALUE').text
                tier_data.append((start_time, end_time, text))

    return tier_data


def transform_latin_to_chinese(text: str, dict_df: pd.DataFrame, output_wav: str) -> Tuple[str, pd.DataFrame]:
    global custom_choices
    transformed_text = ""

    i = 0
    while i < len(text):
        char = text[i]
        if char == "&":
            j = i + 1
            while j < i + 7 and j < len(text) and text[j].isalpha():
                j += 1
            if j < len(text) and text[j].isdigit():
                term = text[(i+1):j + 1].lower()
                pinyin_entries = dict_df[dict_df['拼音'] == term]['繁體']
                if not pinyin_entries.empty:
                    if len(pinyin_entries) > 1:
                        full_sentence = f"Full Sentence: {text}"
                        print(full_sentence)
                        print(f"Path: {output_wav}")
                        print(f"Multiple entries found for {
                              term}. Choose one (or enter a custom character):")
                        for idx, entry in enumerate(pinyin_entries):
                            print(f"{idx + 1}. {entry}")
                        print(f"{len(pinyin_entries) +
                              1}. Enter a custom character")
                        choice = input("Enter the number of your choice: ")
                        if choice.isdigit() and int(choice) <= len(pinyin_entries):
                            choice = int(choice) - 1
                            transformed_text += pinyin_entries.values[choice]
                            custom_choices[term] = pinyin_entries.values[choice]
                        elif choice == str(len(pinyin_entries) + 1):
                            custom_choice = input(
                                f"Enter a custom character for {term}: ")
                            transformed_text += custom_choice
                            custom_choices[term] = custom_choice
                            # Update DataFrame with the custom character
                            dict_df = pd.concat([dict_df, pd.DataFrame(
                                [{'拼音': term, '繁體': custom_choice}])], ignore_index=True)
                        else:
                            print("Invalid choice. Using the default character.")
                            transformed_text += pinyin_entries.values[0]
                    else:
                        try:
                            transformed_text += pinyin_entries.values[0] or ""
                        except:
                            pass
                else:
                    print(f"Full Sentence: {text}")
                    print(f"Path: {output_wav}")
                    custom_choice = input(f"No corresponding character found for {
                                          term}. Enter a custom character: ")
                    transformed_text += custom_choice
                    custom_choices[term] = custom_choice
                    # Update DataFrame with the custom character
                    dict_df = pd.concat([dict_df, pd.DataFrame(
                        [{'拼音': term, '繁體': custom_choice}])], ignore_index=True)
                i = j + 1
            else:
                transformed_text += char
                i += 1
        else:
            transformed_text += char
            i += 1

    return transformed_text, dict_df


def clean_transformed_text(text: str) -> str:
    # Replace "#" with a blank space
    text = text.replace("#", " ")

    # Remove special characters and symbols
    text = re.sub(r"[^a-zA-Z0-9\u4e00-\u9fff ]", "", text)

    # Remove HTML entities (e.g., &amp;)
    text = re.sub(r"&[a-zA-Z]+;", "", text)

    return text


def extract_audio_segments(input_wav: str, output_wav: str, start_time: int, end_time: int) -> None:
    audio = AudioSegment.from_wav(input_wav)
    segment = audio[start_time:end_time]
    segment.export(output_wav, format="wav")


def main() -> None:
    with open(sys.argv[1], "r", encoding="utf-8") as file:
        xml_content = file.read()

    tier_data = parse_xml(xml_content)

    with open("./粵語字典_(耶魯_數字).csv", "r", encoding="utf-8") as dict_file:
        dict_csv = dict_file.name
        dict_df = pd.read_csv(dict_csv)

    # Replace with your actual audio file
    audio_file = sys.argv[1].replace("eaf", "wav")

    transformed_tier_data = []
    for i, (start_time, end_time, text) in enumerate(tier_data):
        output_wav = f"audio/{sys.argv[1].split('/')
                              [-1].replace('.eaf', '')}_ts{i+1}.wav"
        extract_audio_segments(audio_file, output_wav, start_time, end_time)
        transformed_text, dict_df = transform_latin_to_chinese(text, dict_df, output_wav)
        transformed_text = clean_transformed_text(transformed_text)
        transformed_tier_data.append(
            (start_time, end_time, transformed_text, output_wav.split("/")[-1]))

    # Save the updated DataFrame to the CSV file
    dict_df.to_csv(dict_csv, index=False, encoding='utf-8')

    tsv_filename = "transcript/" + \
        sys.argv[1].split("/")[-1].replace("eaf", "tsv")
    with open(tsv_filename, "w", newline="", encoding="utf-8") as tsvfile:
        tsv_writer = csv.writer(tsvfile, delimiter='\t')
        tsv_writer.writerow(
            ["timestamp_start", "timestamp_end", "text", "path"])
        tsv_writer.writerows(transformed_tier_data)


if __name__ == "__main__":
    main()