import logging
import shutil
from pathlib import Path
from moviepy.editor import VideoFileClip
import gradio as gr
import requests
from urllib.parse import urlparse
import subprocess
import atexit

logging.basicConfig(level=logging.INFO)

def download_file(url, destination):
    """Downloads a file from a url to a destination."""
    response = requests.get(url)
    response.raise_for_status()
    with open(destination, 'wb') as f:
        f.write(response.content)

def get_input_path(video_file, video_url):
    """Returns the path to the video file, downloading it if necessary."""
    if video_file is not None:
        return Path(video_file.name)
    elif video_url:
        url_path = urlparse(video_url).path
        file_name = Path(url_path).name
        destination = Path.cwd() / file_name
        download_file(video_url, destination)
        return destination
    else:
        raise ValueError("No input was provided.")

def get_output_path(input_path, res):
    """Returns the path to the output file, creating it if necessary."""
    output_path = Path.cwd() / (Path(input_path).stem + f"_{res}.m3u8")
    return output_path

def get_aspect_ratio(input_path, aspect_ratio):
    """Returns the aspect ratio of the video, calculating it if necessary."""
    if aspect_ratio is not None:
        return aspect_ratio
    video = VideoFileClip(str(input_path))
    return f"{video.size[0]}:{video.size[1]}"

def create_master_playlist(output_paths):
    """Creates a master playlist .m3u8 file that includes all other .m3u8 files."""
    master_playlist_path = Path.cwd() / "master_playlist.m3u8"
    with open(master_playlist_path, 'w') as f:
        f.write("#EXTM3U\n")
        for path in output_paths:
            f.write(f"#EXT-X-STREAM-INF:BANDWIDTH={1000*1000},RESOLUTION={path.stem.split('_')[-1]}\n")
            f.write(f"{path.name}\n")
    return master_playlist_path  # make sure this is a single Path object


def convert_video(video_file, quality, aspect_ratio, video_url):
    input_path = get_input_path(video_file, video_url)
    aspect_ratio = get_aspect_ratio(input_path, aspect_ratio)

    video = VideoFileClip(str(input_path))
    original_height = video.size[1]

    output_paths = []  

    for res in standard_resolutions:
        # Skip if resolution is higher than original
        if res > original_height:
            continue

        scale = "-1:" + str(res)  # we scale the height to res and keep aspect ratio
        output_path = get_output_path(input_path, str(res) + 'p')  # pass the resolution to create a unique output file

        ffmpeg_command = [
            "ffmpeg", "-i", str(input_path), "-c:v", "libx264", "-crf", str(quality),
            "-vf", f"scale={scale}:force_original_aspect_ratio=decrease,pad=ceil(iw/2)*2:ceil(ih/2)*2",
            "-hls_time", "10", "-hls_playlist_type", "vod", "-hls_segment_filename",
            str(Path.cwd() / f"{output_path.stem}_%03d.ts"), str(output_path)
        ]

        logging.info("Running ffmpeg command: " + ' '.join(ffmpeg_command))
        subprocess.run(ffmpeg_command, check=True)

        output_paths.append(output_path)  

    master_playlist_path = create_master_playlist(output_paths)
    output_paths.append(master_playlist_path)

    return [{'name': path.stem, 'url': f"{path.name}"} for path in output_paths]

video_file = gr.inputs.File(label="Video File")
quality = gr.inputs.Dropdown(
    choices=["18", "23", "27", "28", "32"], 
    default="27", 
    label="Quality"
)
aspect_ratio = gr.inputs.Dropdown(
    choices=["16:9",  "1:1", "4:3", "3:2", "5:4", "21:9", "1.85:1", "2.35:1", "3:1", "360", "9:16", "2:1", "1:2", "9:1"], 
    default="16:9", 
    label="Aspect ratio (width:height)"
)
standard_resolutions = [4320, 2160, 1440, 1080, 720, 480, 360, 240, 144]  # 8K, 4K, 2K, Full HD, HD, SD in pixels
video_url = gr.inputs.Textbox(label="Or enter video URL")

def format_output(output):
    html = ""
    for file in output:
        html += f'<p><a href="{file["url"]}" target="_blank">{file["name"]}</a></p>'
    return html

outputs = gr.outputs.HTML(label="Download Links", type="html")

interface = gr.Interface(
    fn=convert_video, 
    inputs=[video_file, quality, aspect_ratio, video_url],
    outputs=outputs,
    interpretation=format_output,
    title="Video Converter",
    description="A simple video converter app",
    allow_flagging=False, 
    server_name="0.0.0.0",
    server_port=7860,
)
interface.launch()