import logging
import requests
from urllib.parse import urlparse, quote_plus
import subprocess
from pathlib import Path
from moviepy.editor import VideoFileClip
import gradio as gr
import http.server
import socketserver
import threading
import socket
import boto3
import s3fs
import os 

# Define output directory
output_dir = Path.cwd() / "output"
output_dir.mkdir(exist_ok=True)

# Set S3 credentials
AWS_S3_BUCKET = os.getenv("AWS_S3_BUCKET")
AWS_ACCESS_KEY_ID = os.getenv("AWS_ACCESS_KEY_ID")
AWS_SECRET_ACCESS_KEY = os.getenv("AWS_SECRET_ACCESS_KEY")
session = boto3.Session(
    aws_access_key_id=AWS_ACCESS_KEY_ID,
    aws_secret_access_key=AWS_SECRET_ACCESS_KEY,
    region_name='us-east-1'
)

s3 = session.client('s3')
fs = s3fs.S3FileSystem(anon=False, client_kwargs={'region_name': 'us-east-1'})

logging.basicConfig(level=logging.INFO)

standard_resolutions = [4320, 2160, 1440, 1080, 720, 480, 360, 240]

def start_http_server(port=8000):
    handler = http.server.SimpleHTTPRequestHandler
    httpd = socketserver.TCPServer(("", port), handler)
    logging.info(f"Serving at port {port}")
    thread = threading.Thread(target=httpd.serve_forever)
    thread.start()

def get_ip_address():
    s = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
    try:
        s.connect(('10.255.255.255', 1))
        IP = s.getsockname()[0]
    except Exception:
        IP = '127.0.0.1'
    finally:
        s.close()
    return IP

def download_file(url, 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):
    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 = output_dir / file_name
        download_file(video_url, destination)
        return destination
    else:
        raise ValueError("No input was provided.")

def get_output_path(input_path, res):
    output_path = output_dir / f"{Path(input_path).stem}_{res}p.m3u8"
    return output_path

def create_master_playlist(output_paths, input_filename):
    master_playlist_path = output_dir / f"{input_filename}_master_playlist.m3u8"
    with open(master_playlist_path, "w") as f:
        f.write("#EXTM3U\n")
        for path in output_paths:
            res = Path(path).stem.split("_")[1]
            f.write(f'#EXT-X-STREAM-INF:BANDWIDTH=8000000,RESOLUTION={res}\n')
            # read the .m3u8 file and replace relative links with absolute links
            with open(path, 'r') as playlist_file:
                content = playlist_file.readlines()
            content = [line.replace('.ts', f'.ts\n') if line.endswith('.ts\n') else line for line in content]
            content = [f"{quote_plus(line.rstrip())}\n" if line.endswith('.ts\n') else line for line in content]
            f.writelines(content)
    return master_playlist_path

def upload_file_to_s3(file_path, s3_path):
    print(f"Uploading {file_path} to AWS at {s3_path}")
    with open(file_path, 'rb') as file:
        file_content = file.read()

    with fs.open(s3_path, 'wb') as file:
        file.write(file_content)


def convert_video(video_file, quality, aspect_ratio, video_url):
    # Ensure either a file or a URL is provided
    if not video_file and not video_url:
        raise ValueError("Please provide either a video file or a video URL.")
    
    input_path = get_input_path(video_file, video_url)
    video = VideoFileClip(str(input_path))

    # Get the original height to avoid upscaling
    original_height = video.size[1]

    # Get the original height to avoid upscaling
    original_height = video.size[1]

    output_paths = []
    for res in reversed(standard_resolutions):
        if res > original_height:
            continue

        scale = "-1:" + str(res)
        output_path = get_output_path(input_path, str(res) + 'p')

        # use a lower CRF value for better quality
        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(output_dir / 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, Path(input_path).stem)
    output_paths.append(master_playlist_path)

    output_links = []
    for path in output_paths:
        s3_path = f"s3://{AWS_S3_BUCKET}/{Path(input_path).stem}/{Path(path).name}"
        upload_file_to_s3(path, s3_path)
        output_links.append(f'<a href="https://{AWS_S3_BUCKET}.s3.amazonaws.com/{Path(input_path).stem}/{quote_plus(Path(path).name)}" target="_blank">Download {Path(path).stem}</a>')

    # upload ts files to s3
    for path in output_dir.glob(f"{Path(input_path).stem}_*p_*.ts"):
        s3_path = f"s3://{AWS_S3_BUCKET}/{Path(input_path).stem}/{Path(path).name}"
        upload_file_to_s3(path, s3_path)

    output_html = "<br>".join(output_links)
    return output_html

video_file = gr.inputs.File(label="Your video file")
quality = gr.inputs.Slider(minimum=0, maximum=51, default=23, label="Quality (0: Highest Quality - 50: Fastest)")
aspect_ratio = gr.inputs.Dropdown(["16:9", "4:3", "1:1", "3:4", "9:16", "1:1", "2:1", "1:2"], label="Aspect Ratio", default="16:9")
video_url = gr.inputs.Textbox(lines=1, placeholder="or paste video url here", label="Video URL")

interface = gr.Interface(
    fn=convert_video, 
    inputs=[video_file, quality, aspect_ratio, video_url],
    outputs=gr.outputs.HTML(label="Download Links"),
    title="NEAR Hub Video Transcoder to m3u8",
    description="convert video files to m3u8 for VOD streaming in nearhub.club.",
    allow_flagging='never'
)

start_http_server()
interface.launch(server_name=get_ip_address(), server_port=7860)