use crate::config::{INVIDIOUS_INSTANCES, STORAGE_MESSAGE_ID};
use crate::structs::{Error, InvidiousVideo, Result, VideoData, YoutubeDLError};
use grammers_client::{types::Chat, InputMessage};
use quick_xml::{events::Event, Reader};
use rand::{thread_rng, Rng};
use reqwest::Client;
use std::io::Cursor;
use std::process::Stdio;
use tokio::io::AsyncWriteExt;
use tokio::process::Command;
use tokio::time::{sleep, Duration};
extern crate grammers_client;
extern crate serde_json;
extern crate tokio;

const PYTHON_INPUT: &[u8] = br#"import sys
import json
try:
    import yt_dlp as youtube_dl
except ImportError:
    import youtube_dl
_try_get = youtube_dl.extractor.youtube.try_get
def traverse_dict(src):
    for (key, value) in src.items():
        if key == 'scheduledStartTime':
            return value
        if isinstance(value, dict):
            if value := traverse_dict(value):
                return value
    return None

def try_get(src, getter, expected_type=None):
    if isinstance(src, dict):
        if reason := src.get('reason'):
            if isinstance(reason, str) and (reason.startswith('This live event will begin in ') or reason.startswith('Premieres in ')):
                if t := _try_get(src, traverse_dict, str):
                    src['reason'] = f'autoytarchivers:{t} {reason}'
    return _try_get(src, getter, expected_type)
youtube_dl.extractor.youtube.try_get = try_get
ytdl = youtube_dl.YoutubeDL({"skip_download": True, "no_color": True, "quiet": True})
try:
    print(json.dumps(ytdl.extract_info("https://www.youtube.com/watch?v=" + sys.argv[1]), indent=4))
except Exception as e:
    sys.exit(str(e))"#;

pub async fn get_videos(client: &Client, channel_id: &str) -> Result<Vec<String>> {
    let mut video_ids = vec![];
    if let Some(invidious_instances) = INVIDIOUS_INSTANCES {
        for i in &invidious_instances {
            let resp = match client
                .get(&format!("{}/api/v1/channels/{}/latest", i, channel_id))
                .query(&[("fields", "videoId")])
                .header("Cache-Control", "no-store, max-age=0")
                .send()
                .await
            {
                Ok(i) => i,
                Err(err) => {
                    eprintln!("Failed to connect to {}: {:?}", i, err);
                    continue;
                }
            };
            if resp.status() != 200 {
                eprintln!("Got {} from {}", resp.status(), i);
                continue;
            }
            let resp = match resp.bytes().await {
                Ok(i) => i,
                Err(err) => {
                    eprintln!("Failed to get data from {}: {:?}", i, err);
                    continue;
                }
            };
            let resp: Vec<InvidiousVideo> = match serde_json::from_slice(&resp) {
                Ok(i) => i,
                Err(err) => {
                    eprintln!("Failed to parse data from {}: {:?}", i, err);
                    continue;
                }
            };
            video_ids.extend(resp.into_iter().take(15).map(|i| i.video_id));
            if !video_ids.is_empty() {
                return Ok(video_ids);
            }
        }
    }
    let resp = client
        .get("https://www.youtube.com/feeds/videos.xml")
        .query(&[("channel_id", channel_id)])
        .header("Cache-Control", "no-store, max-age=0")
        .send()
        .await?
        .error_for_status()?
        .text()
        .await?;
    let mut reader = Reader::from_str(&resp);
    let mut buf = vec![];
    let mut inside = false;
    loop {
        match reader.read_event(&mut buf) {
            Ok(Event::Start(ref e)) if e.name() == b"yt:videoId" => inside = true,
            Ok(Event::Text(e)) if inside => {
                video_ids.push(e.unescape_and_decode(&reader)?);
                if video_ids.len() >= 15 {
                    break;
                }
                inside = false;
            }
            Ok(Event::Eof) => break,
            Err(err) => Err(err)?,
            _ => (),
        };
        buf.clear();
    }
    Ok(video_ids)
}

pub async fn get_video(video_id: &str) -> Result<Option<VideoData>> {
    let mut command = Command::new("python3");
    let mut process = command
        .args(&["-", video_id])
        .stdin(Stdio::piped())
        .stdout(Stdio::piped())
        .stderr(Stdio::piped())
        .spawn()?;
    let mut stdin = process.stdin.take().unwrap();
    tokio::spawn(async move {
        if let Err(err) = stdin.write_all(PYTHON_INPUT).await {
            eprintln!("Failed to write PYTHON_INPUT: {:?}", err);
        }
        drop(stdin)
    });
    let output = process.wait_with_output().await?;
    if output.status.success() {
        let mut data: VideoData = serde_json::from_slice(&output.stdout)?;
        data.json = String::from_utf8(output.stdout)?;
        Ok(Some(data))
    } else {
        let stderr = String::from_utf8(output.stderr)?;
        let stderr_lowercase = stderr.to_lowercase();
        if stderr_lowercase.contains("private video")
            || stderr_lowercase.contains("unavailable")
            || stderr_lowercase.contains("not available")
        {
            Ok(None)
        } else {
            Err(Error::YoutubeDL(YoutubeDLError {
                status: output.status,
                stdout: String::from_utf8(output.stdout)?,
                stderr,
            }))
        }
    }
}

pub async fn get_video_retry(
    tclient: &mut grammers_client::Client,
    chat: &Chat,
    video_data: VideoData,
) -> Option<VideoData> {
    for i in 1..=5 {
        match get_video(&video_data.id).await {
            Ok(i) => return i,
            Err(err) => {
                eprintln!("Failed to get video data: {:?}", err);
                if let Error::YoutubeDL(ref err) = err {
                    let output = err.stderr.to_lowercase();
                    if output.contains("429")
                        || output.contains("too many requests")
                        || output.contains("technical difficult")
                    {
                        sleep(Duration::from_secs(i * 60 * 60)).await;
                        continue;
                    }
                }
                let text = format!("{:#?}", err);
                let size = text.len();
                let mut stream = Cursor::new(text.into_bytes());
                match tclient
                    .upload_stream(&mut stream, size, "failed-get-video-data.log".to_string())
                    .await
                {
                    Ok(uploaded) => {
                        let message = InputMessage::text("Failed to get video data")
                            .mime_type("text/plain")
                            .file(uploaded);
                        if let Err(err) = tclient.send_message(&chat, message).await {
                            eprintln!(
                                "Failed to send message about failing to get video data: {:?}",
                                err
                            );
                            if let Err(err) = tclient.send_message(&chat, InputMessage::text("Failed to send message about failing to get video data, see logs")).await {
                                eprintln!("Failed to send message about failing to send message about failing to get video data: {:?}", err);
                            }
                        }
                    }
                    Err(err) => {
                        eprintln!(
                            "Failed to upload logs about failing to get video data: {:?}",
                            err
                        );
                        if let Err(err) = tclient.send_message(&chat, InputMessage::text("Failed to upload logs about failing to get video data, see logs")).await {
                            eprintln!("Failed to send message about failing to upload logs about failing to get video data: {:?}", err);
                        }
                    }
                };
            }
        };
        let tmp = thread_rng().gen_range(30..=10 * 60);
        sleep(Duration::from_secs(tmp)).await;
    }
    Some(video_data)
}

pub fn is_manifest(video_data: &VideoData) -> bool {
    if video_data.requested_formats.is_empty() {
        video_data.url.as_ref().unwrap().domain() == Some("manifest.googlevideo.com")
    } else {
        video_data
            .requested_formats
            .iter()
            .any(|i| i.url.domain() == Some("manifest.googlevideo.com"))
    }
}

pub fn extension(text: &str) -> Option<&str> {
    text.trim_start_matches(".").splitn(2, ".").nth(1)
}

pub async fn update_seen_videos(
    tclient: &mut grammers_client::Client,
    chat: &Chat,
    seen_videos: Vec<String>,
) -> bool {
    let bytes = serde_json::to_vec(&serde_json::json!(seen_videos)).unwrap();
    let size = bytes.len();
    let mut stream = Cursor::new(bytes);
    match tclient
        .upload_stream(&mut stream, size, "autoytarchivers.json".to_string())
        .await
    {
        Ok(uploaded) => {
            let message = InputMessage::text("")
                .mime_type("application/json")
                .file(uploaded);
            if let Err(err) = tclient
                .edit_message(&chat, STORAGE_MESSAGE_ID, message)
                .await
            {
                eprintln!("Failed to edit seen videos: {:?}", err);
                if let Err(err) = tclient
                    .send_message(
                        &chat,
                        InputMessage::text("Failed to edit seen videos, see logs"),
                    )
                    .await
                {
                    eprintln!(
                        "Failed to send message about failing to edit seen videos: {:?}",
                        err
                    );
                }
                false
            } else {
                true
            }
        }
        Err(err) => {
            eprintln!("Failed to upload seen videos: {:?}", err);
            if let Err(err) = tclient
                .send_message(
                    &chat,
                    InputMessage::text("Failed to upload seen videos, see logs"),
                )
                .await
            {
                eprintln!(
                    "Failed to send message about failing to upload seen videos: {:?}",
                    err
                );
            }
            false
        }
    }
}