use crate::DbPool;
use crate::api::ClientVersion;
use crate::providers::Provider;
use crate::status::*;
use crate::util::cache::VideoCache;
use crate::util::requester::Requester;
use crate::util::parse_abbreviated_number;
use crate::util::time::parse_time_to_seconds;
use crate::videos::{ServerOptions, VideoFormat, VideoItem};

use async_trait::async_trait;
use error_chain::error_chain;
use futures::future::join_all;
use htmlentity::entity::{decode, ICodedDataTrait};
use wreq::Version;
use titlecase::Titlecase;
use std::vec;

error_chain! {
    foreign_links {
        Io(std::io::Error);
        HttpRequest(wreq::Error);
    }
    errors {
        Parse(msg: String)
    }
}

#[derive(Debug, Clone)]
pub struct NoodlemagazineProvider {
    url: String,
}

impl NoodlemagazineProvider {
    pub fn new() -> Self {
        Self {
            url: "https://noodlemagazine.com".to_string(),
        }
    }

    fn build_channel(&self, _clientversion: ClientVersion) -> Channel {
        Channel {
            id: "noodlemagazine".into(),
            name: "Noodlemagazine".into(),
            description: "The Best Search Engine of HD Videos".into(),
            premium: false,
            favicon: "https://www.google.com/s2/favicons?sz=64&domain=noodlemagazine.com".into(),
            status: "active".into(),
            categories: vec![],
            options: vec![],
            nsfw: true,
            cacheDuration: Some(1800),
        }
    }

    async fn get(
        &self,
        cache: VideoCache,
        page: u8,
        _sort: &str,
        options: ServerOptions,
    ) -> Result<Vec<VideoItem>> {
        let video_url = format!(
            "{}/popular/recent?sort_by=views&sort_order=desc&p={}",
            self.url,
            page.saturating_sub(1)
        );

        let old_items = match cache.get(&video_url) {
            Some((t, i)) if t.elapsed().unwrap_or_default().as_secs() < 300 => return Ok(i.clone()),
            Some((_, i)) => i.clone(),
            None => vec![],
        };

        let mut requester = match options.requester.clone() {
            Some(r) => r,
            None => return Ok(old_items),
        };

        let text = requester
            .get(&video_url, Some(Version::HTTP_2))
            .await
            .unwrap_or_default();

        let items = self.get_video_items_from_html(text, requester).await;

        if items.is_empty() {
            Ok(old_items)
        } else {
            cache.remove(&video_url);
            cache.insert(video_url, items.clone());
            Ok(items)
        }
    }

    async fn query(
        &self,
        cache: VideoCache,
        page: u8,
        query: &str,
        options: ServerOptions,
    ) -> Result<Vec<VideoItem>> {
        let q = query.trim().replace(' ', "%20");
        let video_url = format!("{}/video/{}?p={}", self.url, q, page.saturating_sub(1));

        let old_items = match cache.get(&video_url) {
            Some((t, i)) if t.elapsed().unwrap_or_default().as_secs() < 300 => return Ok(i.clone()),
            Some((_, i)) => i.clone(),
            None => vec![],
        };

        let mut requester = match options.requester.clone() {
            Some(r) => r,
            None => return Ok(old_items),
        };

        let text = requester
            .get(&video_url, Some(Version::HTTP_2))
            .await
            .unwrap_or_default();

        let items = self.get_video_items_from_html(text, requester).await;

        if items.is_empty() {
            Ok(old_items)
        } else {
            cache.remove(&video_url);
            cache.insert(video_url, items.clone());
            Ok(items)
        }
    }

    async fn get_video_items_from_html(
        &self,
        html: String,
        requester: Requester,
    ) -> Vec<VideoItem> {
        if html.is_empty() || html.contains("404 Not Found") {
            return vec![];
        }

        let section = match html.split(">Show more</div>").next() {
            Some(s) => s,
            None => return vec![],
        };

        let list = match section
            .split("<div class=\"list_videos\" id=\"list_videos\">")
            .nth(1)
        {
            Some(l) => l,
            None => return vec![],
        };

        let raw_videos = list
            .split("<div class=\"item\">")
            .skip(1)
            .map(|s| s.to_string());

        let futures = raw_videos.map(|v| self.get_video_item(v, requester.clone()));
        let results = join_all(futures).await;

        results.into_iter().filter_map(Result::ok).collect()
    }

    async fn get_video_item(
        &self,
        video_segment: String,
        requester: Requester,
    ) -> Result<VideoItem> {
        let href = video_segment
            .split("<a href=\"")
            .nth(1)
            .and_then(|s| s.split('"').next())
            .ok_or_else(|| Error::from("missing href"))?;

        let video_url = format!("{}{}", self.url, href);

        let mut title = video_segment
            .split("<div class=\"title\">")
            .nth(1)
            .and_then(|s| s.split('<').next())
            .unwrap_or("")
            .trim()
            .to_string();

        title = decode(title.as_bytes())
            .to_string()
            .unwrap_or(title)
            .titlecase();

        let id = video_url
            .split('/')
            .nth(4)
            .and_then(|s| s.split('.').next())
            .ok_or_else(|| Error::from("missing id"))?
            .to_string();

        let thumb = video_segment
            .split("data-src=\"")
            .nth(1)
            .and_then(|s| s.split('"').next())
            .unwrap_or("")
            .to_string();

        let raw_duration = video_segment
            .split("#clock-o\"></use></svg>")
            .nth(1)
            .and_then(|s| s.split('<').next())
            .unwrap_or("0:00");

        let duration = parse_time_to_seconds(raw_duration).unwrap_or(0) as u32;

        let views = video_segment
            .split("#eye\"></use></svg>")
            .nth(1)
            .and_then(|s| s.split('<').next())
            .and_then(|v| parse_abbreviated_number(v.trim()))
            .unwrap_or(0);

        let formats = self
            .extract_media(&video_url, requester)
            .await
            .ok_or_else(|| Error::from("media extraction failed"))?;

        Ok(
            VideoItem::new(
                id,
                title,
                video_url,
                "noodlemagazine".into(),
                thumb,
                duration,
            )
            .views(views)
            .formats(formats),
        )
    }

    async fn extract_media(
        &self,
        video_url: &String,
        mut requester: Requester,
    ) -> Option<Vec<VideoFormat>> {
        let text = requester
            .get(video_url, Some(Version::HTTP_2))
            .await
            .unwrap_or_default();

        let json_str = text
            .split("window.playlist = ")
            .nth(1)?
            .split(';')
            .next()?;

        let json: serde_json::Value = serde_json::from_str(json_str).ok()?;
        let sources = json["sources"].as_array()?;

        let mut formats = vec![];

        for s in sources {
            let file = s["file"].as_str()?.to_string();
            let label = s["label"].as_str().unwrap_or("unknown").to_string();

            formats.push(
                VideoFormat::new(file, label.clone(), "video/mp4".into())
                    .format_id(label.clone())
                    .format_note(label.clone())
                    .http_header("Referer".into(), video_url.clone()),
            );
        }

        Some(formats.into_iter().rev().collect())
    }
}

#[async_trait]
impl Provider for NoodlemagazineProvider {
    async fn get_videos(
        &self,
        cache: VideoCache,
        pool: DbPool,
        sort: String,
        query: Option<String>,
        page: String,
        per_page: String,
        options: ServerOptions,
    ) -> Vec<VideoItem> {
        let _ = pool;
        let _ = per_page;

        let page = page.parse::<u8>().unwrap_or(1);

        let res = match query {
            Some(q) => self.query(cache, page, &q, options).await,
            None => self.get(cache, page, &sort, options).await,
        };

        res.unwrap_or_else(|e| {
            eprintln!("Noodlemagazine error: {e}");
            vec![]
        })
    }

    fn get_channel(&self, clientversion: ClientVersion) -> Option<Channel> {
        Some(self.build_channel(clientversion))
    }
}