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

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

fn is_valid_date(s: &str) -> bool {
    // Regex: strict yyyy-mm-dd (no validation of real calendar dates, just format)
    let re = Regex::new(r"^\d{4}-(0[1-9]|1[0-2])-(0[1-9]|[12]\d|3[01])$").unwrap();
    re.is_match(s)
}

#[derive(Debug, Clone)]
pub struct XxdbxProvider {
    url: String,
    stars: Arc<RwLock<Vec<String>>>,
    channels: Arc<RwLock<Vec<String>>>,
}
impl XxdbxProvider {
    pub fn new() -> Self {
        let provider = XxdbxProvider {
            url: "https://xxdbx.com".to_string(),
            stars: Arc::new(RwLock::new(vec![])),
            channels: Arc::new(RwLock::new(vec![])),
        };
        provider
    }

    fn build_channel(&self, clientversion: ClientVersion) -> Channel {
        let _ = clientversion;
        Channel {
            id: "xxdbx".to_string(),
            name: "xxdbx".to_string(),
            description: "XXX Video Database".to_string(),
            premium: false,
            favicon: "https://www.google.com/s2/favicons?sz=64&domain=xxdbx.com".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: "new".into(),
                            title: "New".into(),
                        },
                        FilterOption {
                            id: "popular".into(),
                            title: "Most Popular".into(),
                        },
                    ],
                    multiSelect: false,
                },
            ],
            nsfw: true,
            cacheDuration: Some(1800),
        }
    }

    async fn get(
        &self,
        cache: VideoCache,
        page: u8,
        sort: &str,
        options: ServerOptions,
    ) -> Result<Vec<VideoItem>> {
        let sort_string: String = match sort {
            "popular" => "most-popular".to_string(),
            _ => "".to_string(),
        };
        let video_url = format!(
            "{}/{}?page={}",
            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 search_string = query.trim().to_string();
        let mut search_type = "search";

        if self.channels.read().unwrap().iter().map(|s|s.to_ascii_lowercase()).collect::<Vec<String>>().contains(&search_string.to_ascii_lowercase()) {
            search_type = "channels";
        } else if self.stars.read().unwrap().iter().map(|s|s.to_ascii_lowercase()).collect::<Vec<String>>().contains(&search_string.to_ascii_lowercase()) {
            search_type = "stars";
        } else if is_valid_date(&search_string){
            search_type = "dates";
        }

        let video_url = format!(
            "{}/{}/{}?page={}",
            self.url, search_type, search_string, 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() || html.contains("404 Not Found") {
            return vec![];
        }
        let mut items: Vec<VideoItem> = Vec::new();
        let raw_videos = html.split("</article>").collect::<Vec<&str>>()[0]
            .split("<div class=\"vids\">")
            .collect::<Vec<&str>>()[1]
            .split("<div class=\"v\">")
            .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 {}: {}\n\n", index, line);
            // }
            let video_url: String = format!("{}{}", self.url, video_segment.split("<a href=\"").collect::<Vec<&str>>()[1]
                .split("\"")
                .collect::<Vec<&str>>()[0]
                .to_string());
            let mut title = video_segment
                .split("<div class=\"v_title\">")
                .collect::<Vec<&str>>()[1]
                .split("<")
                .collect::<Vec<&str>>()[0]
                .trim()
                .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 = format!("https:{}", video_segment.split("<img ").collect::<Vec<&str>>()[1]
                .split("src=\"").collect::<Vec<&str>>().last().unwrap()
                .split("\"")
                .collect::<Vec<&str>>()[0]
                .to_string());
            let raw_duration = video_segment
                .split("<div class=\"v_dur\">")
                .collect::<Vec<&str>>()[1]
                .split("<")
                .collect::<Vec<&str>>()[0]
                .to_string();
            let duration = parse_time_to_seconds(raw_duration.as_str()).unwrap_or(0) as u32;

            let preview = format!("https:{}",video_segment
                .split("data-preview=\"")
                .collect::<Vec<&str>>()[1]
                .split("\"")
                .collect::<Vec<&str>>()[0]
                .to_string());
            let tags = video_segment.split("<div class=\"v_tags\">").collect::<Vec<&str>>()[1]
                .split("</div>").collect::<Vec<&str>>()[0]
                .split("<a href=\"")
                .collect::<Vec<&str>>()[1..]
                .into_iter().map(|s| s.split("\"").collect::<Vec<&str>>()[0].replace("%20"," ").to_string()).collect::<Vec<String>>();
            for tag in tags.clone() {
                let shorted_tag = tag.split("/").collect::<Vec<&str>>()[2].to_string();
                if tag.contains("channels") && self.channels.read().unwrap().contains(&shorted_tag) == false {
                    self.channels.write().unwrap().push(shorted_tag.clone());
                }
                if tag.contains("stars") && self.stars.read().unwrap().contains(&shorted_tag) == false {
                    self.stars.write().unwrap().push(shorted_tag.clone());
                }
            }
            let video_item = VideoItem::new(
                id,
                title,
                video_url.to_string(),
                "xxdbx".to_string(),
                thumb,
                duration,
            )
            .tags(tags.into_iter().map(|s| s.split("/").collect::<Vec<&str>>().last().unwrap().to_string()).collect::<Vec<String>>())
            .preview(preview);
            items.push(video_item);
        }
        return items;
    }
}

#[async_trait]
impl Provider for XxdbxProvider {
    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)
    }
}