use crate::DbPool;
use crate::api::ClientVersion;
use crate::providers::Provider;
use crate::status::*;
use crate::util::cache::VideoCache;
use crate::util::discord::send_discord_error_report;
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::{decode, ICodedDataTrait};
use std::sync::{Arc, RwLock};
use std::vec;
use std::fmt::Write;

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

#[derive(Debug, Clone)]
pub struct PmvhavenProvider {
    url: String,
    stars: Arc<RwLock<Vec<String>>>,
    categories: Arc<RwLock<Vec<String>>>,
}

impl PmvhavenProvider {
    pub fn new() -> Self {
        Self {
            url: "https://pmvhaven.com".to_string(),
            stars: Arc::new(RwLock::new(vec![])),
            categories: Arc::new(RwLock::new(vec![])),
        }
    }

    fn build_channel(&self, clientversion: ClientVersion) -> Channel {
        let _ = clientversion;

        let categories = self
            .categories
            .read()
            .map(|g| g.clone())
            .unwrap_or_default();

        Channel {
            id: "pmvhaven".to_string(),
            name: "PMVHaven".to_string(),
            description: "Best PMV Videos".to_string(),
            premium: false,
            favicon: "https://www.google.com/s2/favicons?sz=64&domain=pmvhaven.com".to_string(),
            status: "active".to_string(),
            categories,
            options: vec![
                ChannelOption {
                    id: "sort".into(),
                    title: "Sort".into(),
                    description: "Sort the Videos".into(),
                    systemImage: "list.number".into(),
                    colorName: "blue".into(),
                    options: vec![
                        FilterOption {
                            id: "relevance".into(),
                            title: "Relevance".into(),
                        },
                        FilterOption {
                            id: "newest".into(),
                            title: "Newest".into(),
                        },
                        FilterOption {
                            id: "oldest".into(),
                            title: "Oldest".into(),
                        },
                        FilterOption {
                            id: "most viewed".into(),
                            title: "Most Viewed".into(),
                        },
                        FilterOption {
                            id: "most liked".into(),
                            title: "Most Liked".into(),
                        },
                        FilterOption {
                            id: "most disliked".into(),
                            title: "Most Disliked".into(),
                        },
                    ],
                    multiSelect: false,
                },
                ChannelOption {
                    id: "duration".into(),
                    title: "Duration".into(),
                    description: "Length of the Videos".into(),
                    systemImage: "timer".into(),
                    colorName: "green".into(),
                    options: vec![
                        FilterOption {
                            id: "any".into(),
                            title: "Any".into(),
                        },
                        FilterOption {
                            id: "<4 min".into(),
                            title: "<4 min".into(),
                        },
                        FilterOption {
                            id: "4-20 min".into(),
                            title: "4-20 min".into(),
                        },
                        FilterOption {
                            id: "20-60 min".into(),
                            title: "20-60 min".into(),
                        },
                        FilterOption {
                            id: ">1 hour".into(),
                            title: ">1 hour".into(),
                        },
                    ],
                    multiSelect: false,
                },
            ],
            nsfw: true,
            cacheDuration: None,
        }
    }

    fn push_unique(target: &Arc<RwLock<Vec<String>>>, item: String) {
        if let Ok(mut vec) = target.write() {
            if !vec.iter().any(|x| x == &item) {
                vec.push(item);
            }
        }
    }

    async fn query(
        &self,
        cache: VideoCache,
        page: u8,
        query: &str,
        options: ServerOptions,
    ) -> Result<Vec<VideoItem>> {
        let search = query.trim().to_string();

        let sort = match options.sort.as_deref() {
            Some("newest") => "&sort=-uploadDate",
            Some("oldest") => "&sort=uploadDate",
            Some("most viewed") => "&sort=-views",
            Some("most liked") => "&sort=-likes",
            Some("most disliked") => "&sort=-dislikes",
            _ => "",
        };

        let duration = match options.duration.as_deref() {
            Some("<4 min") => "&durationMax=240",
            Some("4-20 min") => "&durationMin=240&durationMax=1200",
            Some("20-60 min") => "&durationMin=1200&durationMax=3600",
            Some(">1 hour") => "&durationMin=3600",
            _ => "",
        };

        let endpoint = if search.is_empty() {
            "api/videos"
        } else {
            "api/videos/search"
        };

        let mut url = format!(
            "{}/{endpoint}?limit=100&page={page}{duration}{sort}",
            self.url
        );

        if let Ok(stars) = self.stars.read() {
            if let Some(star) = stars.iter().find(|s| s.eq_ignore_ascii_case(&search)) {
                url.push_str(&format!("&stars={star}"));
            }
        }

        if let Ok(cats) = self.categories.read() {
            if let Some(cat) = cats.iter().find(|c| c.eq_ignore_ascii_case(&search)) {
                url.push_str(&format!("&tagMode=OR&tags={cat}&expandTags=false"));
            }
        }

        if !search.is_empty() {
            url.push_str(&format!("&q={search}"));
        }
        if let Some((time, items)) = cache.get(&url) {
            if time.elapsed().unwrap_or_default().as_secs() < 300 {
                return Ok(items.clone());
            }
        }

        let mut requester = match options.requester {
            Some(r) => r,
            None => return Ok(vec![]),
        };

        let text = requester.get(&url, None).await.unwrap_or_default();
        let json = serde_json::from_str(&text).unwrap_or(serde_json::Value::Null);
        let items = self.get_video_items_from_json(json).await;

        if !items.is_empty() {
            cache.remove(&url);
            cache.insert(url, items.clone());
        }
        Ok(items)
    }

    async fn get_video_items_from_json(&self, json: serde_json::Value) -> Vec<VideoItem> {
        let mut items = vec![];

        if !json.get("success").and_then(|v| v.as_bool()).unwrap_or(false) {
            return items;
        }

        let videos = json.get("data").and_then(|v| v.as_array()).cloned().unwrap_or_default();

        for video in videos {
            let title = decode(video.get("title").and_then(|v| v.as_str()).unwrap_or("").as_bytes())
                .to_string()
                .unwrap_or_default();

            let id = video
                .get("_id")
                .and_then(|v| v.as_str())
                .unwrap_or(&title)
                .to_string();

            let video_url = video.get("videoUrl").and_then(|v| v.as_str()).unwrap_or("").to_string();
            let thumb = video.get("thumbnailUrl").and_then(|v| v.as_str()).unwrap_or("").to_string();
            let preview = video.get("previewUrl").and_then(|v| v.as_str()).unwrap_or("").to_string();

            let views = video.get("views").and_then(|v| v.as_u64()).unwrap_or(0);
            let duration = parse_time_to_seconds(video.get("duration").and_then(|v| v.as_str()).unwrap_or("0")).unwrap_or(0);

            let tags = video.get("tags").and_then(|v| v.as_array()).cloned().unwrap_or_default();
            let stars = video.get("starsTags").and_then(|v| v.as_array()).cloned().unwrap_or_default();
            for t in tags.iter() {
                if let Some(s) = t.as_str() {
                    let decoded = decode(s.as_bytes()).to_string().unwrap_or_default();
                    Self::push_unique(&self.categories, decoded.clone());
                }
            }
            for t in stars.iter() {
                if let Some(s) = t.as_str() {
                    let decoded = decode(s.as_bytes()).to_string().unwrap_or_default();
                    Self::push_unique(&self.stars, decoded.clone());
                }
            }

            items.push(
                VideoItem::new(id, title, video_url.replace(' ', "%20"), "pmvhaven".into(), thumb, duration as u32)
                    .views(views as u32)
                    .preview(preview)
            );
        }

        items
    }
}

#[async_trait]
impl Provider for PmvhavenProvider {
    async fn get_videos(
        &self,
        cache: VideoCache,
        _pool: DbPool,
        _sort: String,
        query: Option<String>,
        page: String,
        _per_page: String,
        options: ServerOptions,
    ) -> Vec<VideoItem> {
        let page = page.parse::<u8>().unwrap_or(1);
        let query = query.unwrap_or_default();

        match self.query(cache, page, &query, options).await {
            Ok(v) => v,
            Err(e) => {
                eprintln!("pmvhaven error: {e}");
                let mut chain_str = String::new();
                for (i, cause) in e.iter().enumerate() {
                    let _ = writeln!(chain_str, "{}. {}", i + 1, cause);
                }
                send_discord_error_report(
                        e.to_string(),
                        Some(chain_str),
                        Some("PMVHaven Provider"),
                        Some("Failed to load videos from PMVHaven"),
                        file!(),
                        line!(),
                        module_path!(),
                    ).await;
                vec![]
            }
        }
    }

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