use crate::DbPool;
use crate::api::ClientVersion;
use crate::providers::Provider;
use crate::util::cache::VideoCache;
use crate::util::parse_abbreviated_number;
use crate::util::time::parse_time_to_seconds;
use crate::videos::{ServerOptions, VideoItem};
use crate::{status::*, util};
use async_trait::async_trait;
use error_chain::error_chain;
use htmlentity::entity::{ICodedDataTrait, decode};
use std::sync::{Arc, RwLock};
use std::vec;
use std::{env, thread};

error_chain! {
    foreign_links {
        Io(std::io::Error);
        HttpRequest(wreq::Error);
    }
}

#[derive(Debug, Clone)]
pub struct OmgxxxProvider {
    url: String,
    sites: Arc<RwLock<Vec<FilterOption>>>,
    networks: Arc<RwLock<Vec<FilterOption>>>,
}
impl OmgxxxProvider {
    pub fn new() -> Self {
        let provider = OmgxxxProvider {
            url: "https://www.omg.xxx".to_string(),
            sites: Arc::new(RwLock::new(vec![FilterOption {
                id: "all".to_string(),
                title: "All".to_string(),
            }])),
            networks: Arc::new(RwLock::new(vec![FilterOption {
                id: "all".to_string(),
                title: "All".to_string(),
            }])),
        };

        // Kick off the background load but return immediately
        provider.spawn_initial_load();
        provider
    }

    fn spawn_initial_load(&self) {
        let url = self.url.clone();
        let sites = Arc::clone(&self.sites);
        let networks = Arc::clone(&self.networks);

        thread::spawn(move || {
            // Create a tiny runtime just for these async tasks
            let rt = tokio::runtime::Builder::new_current_thread()
                .enable_all()
                .build()
                .expect("build tokio runtime");

            rt.block_on(async move {
                // If you have a streaming sites loader, call it here too
                if let Err(e) = Self::load_sites(&url, sites).await {
                    eprintln!("load_sites_into failed: {e}");
                }

                if let Err(e) = Self::load_networks(&url, networks).await {
                    eprintln!("load_networks failed: {e}");
                }
            });
        });
    }

    async fn load_sites(base_url: &str, networks: Arc<RwLock<Vec<FilterOption>>>) -> Result<()> {
        let mut requester = util::requester::Requester::new();
        let mut page = 0;
        loop {
            page += 1;
            let text = requester
                .get(format!("{}/sites/{}/", &base_url, page).as_str())
                .await
                .unwrap();
            if text.contains("404 Not Found") || text.is_empty() {
                break;
            }
            let sites_div = text
                .split("id=\"list_content_sources_sponsors_list_items\"").collect::<Vec<&str>>()[1]
                .split("class=\"pagination\"").collect::<Vec<&str>>()[0];
            for sites_element in
                sites_div.split("class=\"headline\"").collect::<Vec<&str>>()[1..].to_vec()
            {
                let site_url = sites_element.split("href=\"").collect::<Vec<&str>>()[1]
                    .split("\"")
                    .collect::<Vec<&str>>()[0];
                let site_id = site_url.split("/").collect::<Vec<&str>>()[4].to_string();
                let site_name = sites_element.split("<h2>").collect::<Vec<&str>>()[1]
                    .split("<")
                    .collect::<Vec<&str>>()[0]
                    .to_string();
                Self::push_unique(
                    &networks,
                    FilterOption {
                        id: site_id,
                        title: site_name,
                    },
                );
            }
        }
        return Ok(());
    }

    async fn load_networks(base_url: &str, networks: Arc<RwLock<Vec<FilterOption>>>) -> Result<()> {
        let mut requester = util::requester::Requester::new();
        let text = requester.get(&base_url).await.unwrap();
        let networks_div = text.split("class=\"sites__list\"").collect::<Vec<&str>>()[1]
            .split("</div>")
            .collect::<Vec<&str>>()[0];
        for network_element in
            networks_div.split("sites__item").collect::<Vec<&str>>()[1..].to_vec()
        {
            if network_element.contains("sites__all") {
                continue;
            }
            let network_url = network_element.split("href=\"").collect::<Vec<&str>>()[1]
                .split("\"")
                .collect::<Vec<&str>>()[0];
            let network_id = network_url.split("/").collect::<Vec<&str>>()[4].to_string();
            let network_name = network_element.split(">").collect::<Vec<&str>>()[1]
                .split("<")
                .collect::<Vec<&str>>()[0]
                .to_string();
            Self::push_unique(
                &networks,
                FilterOption {
                    id: network_id,
                    title: network_name,
                },
            );
        }
        return Ok(());
    }

    // Push one item with minimal lock time and dedup by id
    fn push_unique(target: &Arc<RwLock<Vec<FilterOption>>>, item: FilterOption) {
        if let Ok(mut vec) = target.write() {
            if !vec.iter().any(|x| x.id == item.id) {
                vec.push(item);
                // Optional: keep it sorted for nicer UX
                // vec.sort_by(|a,b| a.title.cmp(&b.title));
            }
        }
    }

    fn build_channel(&self, clientversion: ClientVersion) -> Channel {
        let _ = clientversion;
        let sites: Vec<FilterOption> = self
            .sites
            .read()
            .map(|g| g.clone()) // or: .map(|g| g.to_vec())
            .unwrap_or_default(); // or: .unwrap_or_else(|_| Vec::new())

        let networks: Vec<FilterOption> = self
            .networks
            .read()
            .map(|g| g.clone()) // or: .map(|g| g.to_vec())
            .unwrap_or_default(); // or: .unwrap_or_else(|_| Vec::new())

        Channel {
            id: "omgxxx".to_string(),
            name: "OMG XXX".to_string(),
            description: "OMG look at that Collection!".to_string(),
            premium: false,
            favicon: "https://www.google.com/s2/favicons?sz=64&domain=www.omg.xxx".to_string(),
            status: "active".to_string(),
            categories: vec![],
            options: vec![
                ChannelOption {
                    id: "sort".to_string(),
                    title: "Sort".to_string(),
                    description: "Sort the Videos".to_string(),
                    systemImage: "list.number".to_string(),
                    colorName: "blue".to_string(),
                    options: vec![
                        FilterOption {
                            id: "latest-updates".into(),
                            title: "Latest".into(),
                        },
                        FilterOption {
                            id: "most-popular".into(),
                            title: "Most Viewed".into(),
                        },
                        FilterOption {
                            id: "top-rated".into(),
                            title: "Top Rated".into(),
                        },
                    ],
                    multiSelect: false,
                },
                ChannelOption {
                    id: "sites".to_string(),
                    title: "Sites".to_string(),
                    description: "Sort the Videos".to_string(),
                    systemImage: "list.bullet.indent".to_string(),
                    colorName: "green".to_string(),
                    options: sites,
                    multiSelect: false,
                },
                ChannelOption {
                    id: "networks".to_string(),
                    title: "Networks".to_string(),
                    description: "Sort the Videos".to_string(),
                    systemImage: "list.dash".to_string(),
                    colorName: "purple".to_string(),
                    options: networks,
                    multiSelect: false,
                },
            ],
            nsfw: true,
            cacheDuration: None,
        }
    }

    async fn get(
        &self,
        cache: VideoCache,
        page: u8,
        sort: &str,
        options: ServerOptions,
    ) -> Result<Vec<VideoItem>> {
        let mut sort_string: String = match sort {
            "top-rated" => "top-rated".to_string(),
            "most-popular" => "most-popular".to_string(),
            _ => "latest-updates".to_string(),
        };
        if options.network.is_some()
            && !options.network.as_ref().unwrap().is_empty()
            && options.network.as_ref().unwrap() != "all"
        {
            sort_string = format!("networks/{}", options.network.as_ref().unwrap());
        }
        let video_url = format!("{}/{}/{}/", self.url, sort_string, page);
        let old_items = match cache.get(&video_url) {
            Some((time, items)) => {
                if time.elapsed().unwrap_or_default().as_secs() < 60 * 5 {
                    println!("Cache hit for URL: {}", video_url);
                    return Ok(items.clone());
                } else {
                    items.clone()
                }
            }
            None => {
                vec![]
            }
        };

        let mut requester = options.requester.clone().unwrap();
        let text = requester.get(&video_url).await.unwrap();
        let video_items: Vec<VideoItem> = self.get_video_items_from_html(text.clone());
        if !video_items.is_empty() {
            cache.remove(&video_url);
            cache.insert(video_url.clone(), video_items.clone());
        } else {
            return Ok(old_items);
        }
        Ok(video_items)
    }

    async fn query(
        &self,
        cache: VideoCache,
        page: u8,
        query: &str,
        options: ServerOptions,
    ) -> Result<Vec<VideoItem>> {
        let mut search_type = "search";
        if query.starts_with("@models:") {
            search_type = "models";
        }
        let video_url = format!(
            "{}/{}/{}/{}/",
            self.url,
            search_type,
            query
                .to_lowercase()
                .trim()
                .replace(" ", "-")
                .replace("@models:", ""),
            page
        );
        // Check our Video Cache. If the result is younger than 1 hour, we return it.
        let old_items = match cache.get(&video_url) {
            Some((time, items)) => {
                if time.elapsed().unwrap_or_default().as_secs() < 60 * 5 {
                    return Ok(items.clone());
                } else {
                    let _ = cache.check().await;
                    return Ok(items.clone());
                }
            }
            None => {
                vec![]
            }
        };

        let mut requester = options.requester.clone().unwrap();

        let text = requester.get(&video_url).await.unwrap();
        let video_items: Vec<VideoItem> = self.get_video_items_from_html(text.clone());
        if !video_items.is_empty() {
            cache.remove(&video_url);
            cache.insert(video_url.clone(), video_items.clone());
        } else {
            return Ok(old_items);
        }
        Ok(video_items)
    }

    fn get_video_items_from_html(&self, html: String) -> Vec<VideoItem> {
        if html.is_empty() {
            println!("HTML is empty");
            return vec![];
        }
        let mut items: Vec<VideoItem> = Vec::new();
        let raw_videos = html.split("videos_list_pagination").collect::<Vec<&str>>()[0]
            .split(" class=\"pagination\" ")
            .collect::<Vec<&str>>()[0]
            .split("class=\"list-videos\"")
            .collect::<Vec<&str>>()[1]
            .split("class=\"item\"")
            .collect::<Vec<&str>>()[1..]
            .to_vec();
        for video_segment in &raw_videos {
            // let vid = video_segment.split("\n").collect::<Vec<&str>>();
            // for (index, line) in vid.iter().enumerate() {
            //     println!("Line {}: {}", index, line);
            // }
            let video_url: String = video_segment.split("<a href=\"").collect::<Vec<&str>>()[1]
                .split("\"")
                .collect::<Vec<&str>>()[0]
                .to_string();
            let mut title = video_segment.split(" title=\"").collect::<Vec<&str>>()[1]
                .split("\"")
                .collect::<Vec<&str>>()[0]
                .to_string();
            // html decode
            title = decode(title.as_bytes()).to_string().unwrap_or(title);
            let id = video_url.split("/").collect::<Vec<&str>>()[4].to_string();

            let thumb = match video_segment.split("img loading").collect::<Vec<&str>>()[1]
                .contains("data-src=\"")
            {
                true => video_segment.split("img loading").collect::<Vec<&str>>()[1]
                    .split("data-src=\"")
                    .collect::<Vec<&str>>()[1]
                    .split("\"")
                    .collect::<Vec<&str>>()[0]
                    .to_string(),
                false => video_segment.split("img loading").collect::<Vec<&str>>()[1]
                    .split("data-original=\"")
                    .collect::<Vec<&str>>()[1]
                    .split("\"")
                    .collect::<Vec<&str>>()[0]
                    .to_string(),
            };
            let raw_duration = video_segment
                .split("<span class=\"duration\">")
                .collect::<Vec<&str>>()[1]
                .split("<")
                .collect::<Vec<&str>>()[0]
                .split(" ")
                .collect::<Vec<&str>>()
                .last()
                .unwrap_or(&"")
                .to_string();
            let duration = parse_time_to_seconds(raw_duration.as_str()).unwrap_or(0) as u32;
            let views = parse_abbreviated_number(
                video_segment
                    .split("<div class=\"views\">")
                    .collect::<Vec<&str>>()[1]
                    .split("<")
                    .collect::<Vec<&str>>()[0]
                    .to_string()
                    .as_str(),
            )
            .unwrap_or(0) as u32;

            let preview = video_segment
                .split("data-preview=\"")
                .collect::<Vec<&str>>()[1]
                .split("\"")
                .collect::<Vec<&str>>()[0]
                .to_string();

            let tags = match video_segment.contains("class=\"models\">") {
                true => video_segment
                    .split("class=\"models\">")
                    .collect::<Vec<&str>>()[1]
                    .split("</div>")
                    .collect::<Vec<&str>>()[0]
                    .split("href=\"")
                    .collect::<Vec<&str>>()[1..]
                    .into_iter()
                    .map(|s| {
                        format!(
                            "@models:{}",
                            s.split("/").collect::<Vec<&str>>()[4].to_string()
                        )
                    })
                    .collect::<Vec<String>>()
                    .to_vec(),
                false => vec![],
            };

            let video_item = VideoItem::new(
                id,
                title,
                video_url.to_string(),
                "omgxxx".to_string(),
                thumb,
                duration,
            )
            .views(views)
            .preview(preview)
            .tags(tags);
            items.push(video_item);
        }
        return items;
    }
}

#[async_trait]
impl Provider for OmgxxxProvider {
    async fn get_videos(
        &self,
        cache: VideoCache,
        pool: DbPool,
        sort: String,
        query: Option<String>,
        page: String,
        per_page: String,
        options: ServerOptions,
    ) -> Vec<VideoItem> {
        let _ = per_page;
        let _ = pool;
        let videos: std::result::Result<Vec<VideoItem>, Error> = match query {
            Some(q) => {
                self.query(cache, page.parse::<u8>().unwrap_or(1), &q, options)
                    .await
            }
            None => {
                self.get(cache, page.parse::<u8>().unwrap_or(1), &sort, options)
                    .await
            }
        };
        match videos {
            Ok(v) => v,
            Err(e) => {
                println!("Error fetching videos: {}", e);
                vec![]
            }
        }
    }
    fn get_channel(&self, clientversion: ClientVersion) -> crate::status::Channel {
        self.build_channel(clientversion)
    }
}