import os.path
import sys
import time
import urllib.request
from pathlib import Path
from urllib.parse import urlparse, parse_qs, unquote
import gradio as gr

CHUNK_SIZE = 1638400
TOKEN_FILE = Path.home() / '.civitai' / 'config'
USER_AGENT = 'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/58.0.3029.110 Safari/537.3'


def get_token():
    try:
        with open(TOKEN_FILE, 'r') as file:
            token = file.read()
            return token
    except Exception as e:
        return None


def store_token(token: str):
    TOKEN_FILE.parent.mkdir(parents=True, exist_ok=True)

    with open(TOKEN_FILE, 'w') as file:
        file.write(token)


def prompt_for_civitai_token():
    token = input('Please enter your CivitAI API token: ')
    store_token(token)
    return token


def download_file(url: str, output_path: str, token: str):
    headers = {
        'Authorization': f'Bearer {token}',
        'User-Agent': USER_AGENT,
    }

    # Disable automatic redirect handling
    class NoRedirection(urllib.request.HTTPErrorProcessor):
        def http_response(self, request, response):
            return response
        https_response = http_response

    request = urllib.request.Request(url, headers=headers)
    opener = urllib.request.build_opener(NoRedirection)
    response = opener.open(request)

    if response.status in [301, 302, 303, 307, 308]:
        redirect_url = response.getheader('Location')

        # Extract filename from the redirect URL
        parsed_url = urlparse(redirect_url)
        query_params = parse_qs(parsed_url.query)
        content_disposition = query_params.get('response-content-disposition', [None])[0]

        if content_disposition:
            filename = unquote(content_disposition.split('filename=')[1].strip('"'))
        else:
            raise Exception('Unable to determine filename')

        response = urllib.request.urlopen(redirect_url)
    elif response.status == 404:
        raise Exception('File not found')
    else:
        raise Exception('No redirect found, something went wrong')

    total_size = response.getheader('Content-Length')

    if total_size is not None:
        total_size = int(total_size)

    output_file = os.path.join(output_path, filename)

    with open(output_file, 'wb') as f:
        downloaded = 0
        start_time = time.time()

        while True:
            chunk_start_time = time.time()
            buffer = response.read(CHUNK_SIZE)
            chunk_end_time = time.time()

            if not buffer:
                break

            downloaded += len(buffer)
            f.write(buffer)
            chunk_time = chunk_end_time - chunk_start_time

            if chunk_time > 0:
                speed = len(buffer) / chunk_time / (1024 ** 2)  # Speed in MB/s

            if total_size is not None:
                progress = downloaded / total_size
                sys.stdout.write(f'\rDownloading: {filename} [{progress*100:.2f}%] - {speed:.2f} MB/s')
                sys.stdout.flush()

    end_time = time.time()
    time_taken = end_time - start_time
    hours, remainder = divmod(time_taken, 3600)
    minutes, seconds = divmod(remainder, 60)

    if hours > 0:
        time_str = f'{int(hours)}h {int(minutes)}m {int(seconds)}s'
    elif minutes > 0:
        time_str = f'{int(minutes)}m {int(seconds)}s'
    else:
        time_str = f'{int(seconds)}s'

    sys.stdout.write('\n')
    print(f'Download completed. File saved as: {filename}')
    print(f'Downloaded in {time_str}')


def download_civitai_file(url, output_path, token):
    try:
        download_file(url, output_path, token)
        return f'Download completed. File saved in: {output_path}'
    except Exception as e:
        return f'ERROR: {e}'


def main(url, output_path, token):
    if not token:
        token = prompt_for_civitai_token()

    result = download_civitai_file(url, output_path, token)
    return result


with gr.Blocks() as demo:
    gr.Markdown("## CivitAI Downloader")
    url = gr.Textbox(label="CivitAI Download URL")
    output_path = gr.Textbox(label="Output Path")
    token = gr.Textbox(label="API Token (Optional)")
    download_button = gr.Button("Download")
    output = gr.File(label="Output")

    download_button.click(fn=main, inputs=[url, output_path, token], outputs=output)

demo.launch()