use crate::DbPool;
use crate::api::ClientVersion;
use crate::providers::{
    Provider, report_provider_error, report_provider_error_background, requester_or_default,
};
use crate::status::*;
use crate::util::cache::VideoCache;
use crate::util::parse_abbreviated_number;
use crate::util::requester::Requester;
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::stream::{self, StreamExt};
use htmlentity::entity::{ICodedDataTrait, decode};
use regex::Regex;
use scraper::{ElementRef, Html, Selector};
use std::collections::HashMap;
use std::sync::{Arc, RwLock};
use std::{thread, vec};

pub const CHANNEL_METADATA: crate::providers::ProviderChannelMetadata =
    crate::providers::ProviderChannelMetadata {
        group_id: "fetish-kink",
        tags: &["fetish", "bdsm", "niche"],
    };

error_chain! {
    foreign_links {
        Io(std::io::Error);
    }
    errors {
        Parse(msg: String) {
            description("parse error")
            display("parse error: {}", msg)
        }
    }
}

const BASE_URL: &str = "https://heavyfetish.com";
const BROWSER_UA: &str = "Mozilla/5.0 (X11; Linux x86_64; rv:146.0) Gecko/20100101 Firefox/146.0";

#[derive(Debug, Clone)]
pub struct HeavyfetishProvider {
    url: String,
    categories: Arc<RwLock<Vec<FilterOption>>>,
    tags: Arc<RwLock<Vec<FilterOption>>>,
    models: Arc<RwLock<Vec<FilterOption>>>,
    uploaders: Arc<RwLock<Vec<FilterOption>>>,
}

#[derive(Debug, Clone, Copy, PartialEq, Eq)]
enum TargetKind {
    Archive,
    StandardVideos,
    MemberVideos,
    Search,
}

#[derive(Debug, Clone)]
struct QueryTarget {
    kind: TargetKind,
    value: String,
}

impl HeavyfetishProvider {
    pub fn new() -> Self {
        let provider = Self {
            url: BASE_URL.to_string(),
            categories: Arc::new(RwLock::new(vec![FilterOption {
                id: "all".to_string(),
                title: "All".to_string(),
            }])),
            tags: Arc::new(RwLock::new(vec![FilterOption {
                id: "all".to_string(),
                title: "All".to_string(),
            }])),
            models: Arc::new(RwLock::new(vec![FilterOption {
                id: "all".to_string(),
                title: "All".to_string(),
            }])),
            uploaders: Arc::new(RwLock::new(vec![FilterOption {
                id: "all".to_string(),
                title: "All".to_string(),
            }])),
        };
        provider.spawn_initial_load();
        provider
    }

    fn spawn_initial_load(&self) {
        let url = self.url.clone();
        let categories = Arc::clone(&self.categories);
        let tags = Arc::clone(&self.tags);
        let models = Arc::clone(&self.models);
        let uploaders = Arc::clone(&self.uploaders);

        thread::spawn(move || {
            let runtime = match tokio::runtime::Builder::new_current_thread()
                .enable_all()
                .build()
            {
                Ok(runtime) => runtime,
                Err(error) => {
                    report_provider_error_background(
                        "heavyfetish",
                        "spawn_initial_load.runtime_build",
                        &error.to_string(),
                    );
                    return;
                }
            };

            runtime.block_on(async move {
                if let Err(error) = Self::load_categories(&url, Arc::clone(&categories)).await {
                    report_provider_error_background(
                        "heavyfetish",
                        "load_categories",
                        &error.to_string(),
                    );
                }
                if let Err(error) = Self::load_tags(&url, Arc::clone(&tags)).await {
                    report_provider_error_background(
                        "heavyfetish",
                        "load_tags",
                        &error.to_string(),
                    );
                }
                if let Err(error) = Self::load_models(&url, Arc::clone(&models)).await {
                    report_provider_error_background(
                        "heavyfetish",
                        "load_models",
                        &error.to_string(),
                    );
                }
                if let Err(error) = Self::load_uploaders(&url, Arc::clone(&uploaders)).await {
                    report_provider_error_background(
                        "heavyfetish",
                        "load_uploaders",
                        &error.to_string(),
                    );
                }
            });
        });
    }

    fn build_channel(&self, _clientversion: ClientVersion) -> Channel {
        let categories = self
            .categories
            .read()
            .map(|value| value.clone())
            .unwrap_or_default();
        let tags = self
            .tags
            .read()
            .map(|value| value.clone())
            .unwrap_or_default();
        let models = self
            .models
            .read()
            .map(|value| value.clone())
            .unwrap_or_default();
        let uploaders = self
            .uploaders
            .read()
            .map(|value| value.clone())
            .unwrap_or_default();

        Channel {
            id: "heavyfetish".to_string(),
            name: "HeavyFetish".to_string(),
            description:
                "HeavyFetish videos, categories, tags, models, and uploader archives.".to_string(),
            premium: false,
            favicon: "https://www.google.com/s2/favicons?sz=64&domain=heavyfetish.com"
                .to_string(),
            status: "active".to_string(),
            categories: categories.iter().map(|value| value.title.clone()).collect(),
            options: vec![
                ChannelOption {
                    id: "sort".to_string(),
                    title: "Sort".to_string(),
                    description: "Browse HeavyFetish by archive order.".to_string(),
                    systemImage: "list.number".to_string(),
                    colorName: "blue".to_string(),
                    options: vec![
                        FilterOption {
                            id: "new".to_string(),
                            title: "Latest".to_string(),
                        },
                        FilterOption {
                            id: "popular".to_string(),
                            title: "Most Popular".to_string(),
                        },
                        FilterOption {
                            id: "rated".to_string(),
                            title: "Top Rated".to_string(),
                        },
                        FilterOption {
                            id: "longest".to_string(),
                            title: "Longest".to_string(),
                        },
                        FilterOption {
                            id: "commented".to_string(),
                            title: "Most Commented".to_string(),
                        },
                        FilterOption {
                            id: "recommended".to_string(),
                            title: "Most Favorited".to_string(),
                        },
                    ],
                    multiSelect: false,
                },
                ChannelOption {
                    id: "categories".to_string(),
                    title: "Categories".to_string(),
                    description: "Browse a HeavyFetish category archive.".to_string(),
                    systemImage: "square.grid.2x2".to_string(),
                    colorName: "orange".to_string(),
                    options: categories,
                    multiSelect: false,
                },
                ChannelOption {
                    id: "filter".to_string(),
                    title: "Tags".to_string(),
                    description: "Browse a HeavyFetish tag archive.".to_string(),
                    systemImage: "tag.fill".to_string(),
                    colorName: "green".to_string(),
                    options: tags,
                    multiSelect: false,
                },
                ChannelOption {
                    id: "stars".to_string(),
                    title: "Models".to_string(),
                    description: "Browse a HeavyFetish model archive.".to_string(),
                    systemImage: "star.fill".to_string(),
                    colorName: "yellow".to_string(),
                    options: models,
                    multiSelect: false,
                },
                ChannelOption {
                    id: "sites".to_string(),
                    title: "Uploaders".to_string(),
                    description: "Browse a HeavyFetish uploader archive.".to_string(),
                    systemImage: "person.crop.square".to_string(),
                    colorName: "purple".to_string(),
                    options: uploaders,
                    multiSelect: false,
                },
            ],
            nsfw: true,
            cacheDuration: Some(1800),
        }
    }

    fn selector(value: &str) -> Result<Selector> {
        Selector::parse(value)
            .map_err(|error| Error::from(format!("selector `{value}` parse failed: {error}")))
    }

    fn regex(value: &str) -> Result<Regex> {
        Regex::new(value).map_err(|error| Error::from(format!("regex `{value}` failed: {error}")))
    }

    fn collapse_whitespace(text: &str) -> String {
        text.split_whitespace().collect::<Vec<_>>().join(" ")
    }

    fn decode_html(text: &str) -> String {
        decode(text.as_bytes())
            .to_string()
            .unwrap_or_else(|_| text.to_string())
    }

    fn text_of(element: &ElementRef<'_>) -> String {
        Self::decode_html(&Self::collapse_whitespace(
            &element.text().collect::<Vec<_>>().join(" "),
        ))
    }

    fn normalize_title(title: &str) -> String {
        title
            .trim()
            .trim_start_matches('#')
            .split_whitespace()
            .collect::<Vec<_>>()
            .join(" ")
            .to_ascii_lowercase()
    }

    fn normalize_url(&self, url: &str) -> String {
        if url.is_empty() {
            return String::new();
        }
        if url.starts_with("http://") || url.starts_with("https://") {
            return url.to_string();
        }
        if url.starts_with("//") {
            return format!("https:{url}");
        }
        if url.starts_with('/') {
            return format!("{}{}", self.url, url);
        }
        format!("{}/{}", self.url, url.trim_start_matches("./"))
    }

    fn parse_duration(text: &str) -> u32 {
        parse_time_to_seconds(text)
            .and_then(|value| u32::try_from(value).ok())
            .unwrap_or(0)
    }

    fn parse_views(text: &str) -> Option<u32> {
        let cleaned = text
            .replace("views", "")
            .replace("view", "")
            .replace(' ', "")
            .trim()
            .to_string();
        parse_abbreviated_number(&cleaned)
    }

    fn parse_percent(text: &str) -> Option<f32> {
        text.trim()
            .trim_end_matches('%')
            .trim()
            .parse::<f32>()
            .ok()
    }

    fn sort_param(sort: &str) -> Option<&'static str> {
        match sort {
            "popular" | "viewed" | "trending" => Some("video_viewed"),
            "rated" | "rating" | "top" => Some("rating"),
            "longest" | "duration" => Some("duration"),
            "commented" | "comments" => Some("most_commented"),
            "recommended" | "favorited" | "favourited" => Some("most_favourited"),
            _ => None,
        }
    }

    fn append_query_param(url: &str, key: &str, value: &str) -> String {
        let separator = if url.contains('?') { "&" } else { "?" };
        format!("{url}{separator}{key}={value}")
    }

    fn encode_search_query(query: &str) -> String {
        let mut serializer = url::form_urlencoded::Serializer::new(String::new());
        serializer.append_pair("q", query);
        serializer
            .finish()
            .strip_prefix("q=")
            .unwrap_or_default()
            .to_string()
    }

    fn push_unique(target: &Arc<RwLock<Vec<FilterOption>>>, item: FilterOption) {
        if item.id.is_empty() || item.title.is_empty() {
            return;
        }
        if let Ok(mut values) = target.write() {
            if !values.iter().any(|value| value.id == item.id) {
                values.push(item);
            }
        }
    }

    async fn fetch_html(url: &str) -> Result<String> {
        let mut requester = Requester::new();
        requester
            .get(url, None)
            .await
            .map_err(|error| Error::from(format!("request failed for {url}: {error}")))
    }

    async fn load_categories(
        base_url: &str,
        categories: Arc<RwLock<Vec<FilterOption>>>,
    ) -> Result<()> {
        let html = Self::fetch_html(&format!("{base_url}/categories/")).await?;
        let document = Html::parse_document(&html);
        let selector = Self::selector("#list_categories_categories_list_items a.item[href]")?;

        for element in document.select(&selector) {
            let href = element.value().attr("href").unwrap_or_default().to_string();
            let title = element
                .value()
                .attr("title")
                .map(str::trim)
                .filter(|value| !value.is_empty())
                .map(ToOwned::to_owned)
                .unwrap_or_else(|| Self::text_of(&element));
            let normalized = href.trim_end_matches('/').to_string();

            if !normalized.starts_with(&format!("{base_url}/categories/")) || title.is_empty() {
                continue;
            }

            Self::push_unique(
                &categories,
                FilterOption {
                    id: format!("{normalized}/"),
                    title,
                },
            );
        }

        Ok(())
    }

    async fn load_tags(base_url: &str, tags: Arc<RwLock<Vec<FilterOption>>>) -> Result<()> {
        let html = Self::fetch_html(&format!("{base_url}/tags/")).await?;
        let document = Html::parse_document(&html);
        let selector = Self::selector("a[href]")?;

        for element in document.select(&selector) {
            let href = element.value().attr("href").unwrap_or_default().trim_end_matches('/');
            if !href.starts_with(&format!("{base_url}/tags/")) {
                continue;
            }

            let remainder = href
                .strip_prefix(&format!("{base_url}/tags/"))
                .unwrap_or_default();
            if remainder.is_empty() || remainder.contains('/') {
                continue;
            }

            let title = element
                .value()
                .attr("title")
                .map(str::trim)
                .filter(|value| !value.is_empty())
                .map(ToOwned::to_owned)
                .unwrap_or_else(|| Self::text_of(&element));
            if title.is_empty() {
                continue;
            }

            Self::push_unique(
                &tags,
                FilterOption {
                    id: format!("{href}/"),
                    title,
                },
            );
        }

        Ok(())
    }

    async fn load_models(base_url: &str, models: Arc<RwLock<Vec<FilterOption>>>) -> Result<()> {
        let selector = Self::selector("#list_models_models_list_items a.item[href]")?;

        for page in 1..=5 {
            let url = if page == 1 {
                format!("{base_url}/fetish-models/")
            } else {
                format!("{base_url}/fetish-models/{page}/")
            };
            let html = Self::fetch_html(&url).await?;
            let document = Html::parse_document(&html);

            for element in document.select(&selector) {
                let href = element.value().attr("href").unwrap_or_default().trim_end_matches('/');
                let title = element
                    .value()
                    .attr("title")
                    .map(str::trim)
                    .filter(|value| !value.is_empty())
                    .map(ToOwned::to_owned)
                    .unwrap_or_else(|| Self::text_of(&element));

                if !href.starts_with(&format!("{base_url}/fetish-models/")) || title.is_empty() {
                    continue;
                }

                Self::push_unique(
                    &models,
                    FilterOption {
                        id: format!("{href}/"),
                        title,
                    },
                );
            }
        }

        Ok(())
    }

    async fn load_uploaders(
        base_url: &str,
        uploaders: Arc<RwLock<Vec<FilterOption>>>,
    ) -> Result<()> {
        let selector = Self::selector("#list_members_members_items a[href]")?;
        let title_selector = Self::selector("strong.title")?;

        for page in 1..=5 {
            let mut url = format!("{base_url}/members/");
            if page > 1 {
                url = Self::append_query_param(&url, "from_members", &page.to_string());
            }

            let html = Self::fetch_html(&url).await?;
            let document = Html::parse_document(&html);

            for element in document.select(&selector) {
                let href = element.value().attr("href").unwrap_or_default().trim_end_matches('/');
                if !href.starts_with(&format!("{base_url}/members/")) {
                    continue;
                }

                let remainder = href
                    .strip_prefix(&format!("{base_url}/members/"))
                    .unwrap_or_default();
                if remainder.is_empty() || remainder.contains('/') {
                    continue;
                }
                if !remainder.chars().all(|value| value.is_ascii_digit()) {
                    continue;
                }

                let title = element
                    .select(&title_selector)
                    .next()
                    .map(|value| Self::text_of(&value))
                    .filter(|value| !value.is_empty())
                    .unwrap_or_else(|| Self::text_of(&element));
                if title.is_empty() {
                    continue;
                }

                Self::push_unique(
                    &uploaders,
                    FilterOption {
                        id: format!("{href}/"),
                        title,
                    },
                );
            }
        }

        Ok(())
    }

    fn resolve_option_target(&self, options: &ServerOptions) -> QueryTarget {
        if let Some(uploader) = options.sites.as_deref() {
            if uploader.starts_with(&self.url) && uploader != "all" {
                return QueryTarget {
                    kind: TargetKind::MemberVideos,
                    value: uploader.to_string(),
                };
            }
        }

        if let Some(model) = options.stars.as_deref() {
            if model.starts_with(&self.url) && model != "all" {
                return QueryTarget {
                    kind: TargetKind::StandardVideos,
                    value: model.to_string(),
                };
            }
        }

        if let Some(tag) = options.filter.as_deref() {
            if tag.starts_with(&self.url) && tag != "all" {
                return QueryTarget {
                    kind: TargetKind::StandardVideos,
                    value: tag.to_string(),
                };
            }
        }

        if let Some(category) = options.categories.as_deref() {
            if category.starts_with(&self.url) && category != "all" {
                return QueryTarget {
                    kind: TargetKind::StandardVideos,
                    value: category.to_string(),
                };
            }
        }

        QueryTarget {
            kind: TargetKind::Archive,
            value: String::new(),
        }
    }

    fn match_filter(options: &[FilterOption], query: &str, kind: TargetKind) -> Option<QueryTarget> {
        let normalized_query = Self::normalize_title(query);
        options
            .iter()
            .find(|value| value.id != "all" && Self::normalize_title(&value.title) == normalized_query)
            .map(|value| QueryTarget {
                kind,
                value: value.id.clone(),
            })
    }

    fn resolve_query_target(&self, query: &str) -> QueryTarget {
        if let Ok(uploaders) = self.uploaders.read() {
            if let Some(target) = Self::match_filter(&uploaders, query, TargetKind::MemberVideos) {
                return target;
            }
        }

        if let Ok(models) = self.models.read() {
            if let Some(target) = Self::match_filter(&models, query, TargetKind::StandardVideos) {
                return target;
            }
        }

        if let Ok(tags) = self.tags.read() {
            if let Some(target) = Self::match_filter(&tags, query, TargetKind::StandardVideos) {
                return target;
            }
        }

        if let Ok(categories) = self.categories.read() {
            if let Some(target) = Self::match_filter(&categories, query, TargetKind::StandardVideos)
            {
                return target;
            }
        }

        QueryTarget {
            kind: TargetKind::Search,
            value: query.to_string(),
        }
    }

    fn build_url_for_target(&self, target: &QueryTarget, page: u16, sort: &str) -> String {
        let sort_by = Self::sort_param(sort);

        match target.kind {
            TargetKind::Archive => {
                let mut url = if page > 1 {
                    format!("{}/fetish-videos/{page}/", self.url)
                } else {
                    format!("{}/fetish-videos/", self.url)
                };
                if let Some(sort_by) = sort_by {
                    url = Self::append_query_param(&url, "sort_by", sort_by);
                }
                url
            }
            TargetKind::StandardVideos => {
                let mut url = target.value.clone();
                if page > 1 {
                    url = Self::append_query_param(&url, "from", &page.to_string());
                }
                if let Some(sort_by) = sort_by {
                    url = Self::append_query_param(&url, "sort_by", sort_by);
                }
                url
            }
            TargetKind::MemberVideos => {
                let mut url = target.value.clone();
                if page > 1 {
                    url = Self::append_query_param(&url, "from_videos", &page.to_string());
                }
                if let Some(sort_by) = sort_by {
                    url = Self::append_query_param(&url, "sort_by", sort_by);
                }
                url
            }
            TargetKind::Search => {
                let encoded_query = Self::encode_search_query(&target.value);
                let mut url = format!("{}/search/{encoded_query}/", self.url);
                if page > 1 {
                    url = Self::append_query_param(&url, "from_videos", &page.to_string());
                    url = Self::append_query_param(&url, "from_albums", &page.to_string());
                }
                if let Some(sort_by) = sort_by {
                    url = Self::append_query_param(&url, "sort_by", sort_by);
                }
                url
            }
        }
    }

    fn list_container<'a>(&self, document: &'a Html) -> Result<Option<ElementRef<'a>>> {
        for selector_text in [
            "#list_videos_fetish_videos_list_items",
            "#list_videos_videos_list_search_result_items",
            "#list_videos_common_videos_list_items",
            "#list_videos_uploaded_videos_items",
        ] {
            let selector = Self::selector(selector_text)?;
            if let Some(element) = document.select(&selector).next() {
                return Ok(Some(element));
            }
        }
        Ok(None)
    }

    fn parse_list_videos(&self, html: &str) -> Result<Vec<VideoItem>> {
        let document = Html::parse_document(html);
        let Some(container) = self.list_container(&document)? else {
            return Ok(vec![]);
        };

        let card_selector = Self::selector("div.item.hf-video-item")?;
        let link_selector = Self::selector("a[href*=\"/videos/\"]")?;
        let image_selector = Self::selector("img.thumb")?;
        let title_selector = Self::selector("strong.title")?;
        let duration_selector = Self::selector("div.duration")?;
        let rating_selector = Self::selector("div.rating")?;
        let views_selector = Self::selector("div.views")?;

        let mut items = Vec::new();

        for card in container.select(&card_selector) {
            let Some(link) = card.select(&link_selector).next() else {
                continue;
            };

            let href = link.value().attr("href").unwrap_or_default();
            let page_url = self.normalize_url(href);
            let id = page_url
                .trim_end_matches('/')
                .split('/')
                .nth_back(1)
                .unwrap_or_default()
                .to_string();

            if id.is_empty() || page_url.is_empty() {
                continue;
            }

            let image = card.select(&image_selector).next();
            let thumb = image
                .and_then(|value| {
                    value
                        .value()
                        .attr("data-webp")
                        .or_else(|| value.value().attr("data-original"))
                        .or_else(|| value.value().attr("src"))
                })
                .map(|value| self.normalize_url(value))
                .unwrap_or_default();

            let preview = image
                .and_then(|value| value.value().attr("data-preview"))
                .map(|value| self.normalize_url(value));

            let title = card
                .select(&title_selector)
                .next()
                .map(|value| Self::text_of(&value))
                .filter(|value| !value.is_empty())
                .or_else(|| {
                    link.value()
                        .attr("title")
                        .map(Self::decode_html)
                        .filter(|value| !value.is_empty())
                });

            let Some(title) = title else {
                continue;
            };

            let duration = card
                .select(&duration_selector)
                .next()
                .map(|value| Self::parse_duration(&Self::text_of(&value)))
                .unwrap_or(0);

            let rating = card
                .select(&rating_selector)
                .next()
                .and_then(|value| Self::parse_percent(&Self::text_of(&value)));

            let views = card
                .select(&views_selector)
                .next()
                .and_then(|value| Self::parse_views(&Self::text_of(&value)));

            let mut item = VideoItem::new(
                id,
                title,
                page_url,
                "heavyfetish".to_string(),
                thumb,
                duration,
            );
            if let Some(preview) = preview {
                item = item.preview(preview);
            }
            if let Some(rating) = rating {
                item = item.rating(rating);
            }
            if let Some(views) = views {
                item = item.views(views);
            }

            items.push(item);
        }

        Ok(items)
    }

    fn extract_js_value(block: &str, regex: &Regex) -> Option<String> {
        regex
            .captures(block)
            .and_then(|captures| captures.get(1))
            .map(|value| value.as_str().replace("\\/", "/").replace("\\'", "'"))
    }

    fn quality_from_url(url: &str) -> String {
        for quality in ["2160p", "1440p", "1080p", "720p", "480p", "360p", "240p"] {
            if url.contains(quality) {
                return quality.to_string();
            }
        }
        "480p".to_string()
    }

    fn build_formats(&self, html: &str, page_url: &str) -> Result<Vec<VideoFormat>> {
        let flashvars_regex = Self::regex(r#"(?s)var\s+flashvars\s*=\s*\{(.*?)\};"#)?;
        let value_regex = |key: &str| Self::regex(&format!(r#"{key}:\s*'((?:\\'|[^'])*)'"#));
        let flashvars = flashvars_regex
            .captures(html)
            .and_then(|value| value.get(1))
            .map(|value| value.as_str().to_string())
            .unwrap_or_default();

        let mut seen = HashMap::<String, String>::new();
        for key in ["video_alt_url2", "video_alt_url", "video_url"] {
            let url_regex = value_regex(key)?;
            let text_regex = value_regex(&format!("{key}_text"))?;
            if let Some(url) = Self::extract_js_value(&flashvars, &url_regex) {
                let normalized = self.normalize_url(&url);
                let quality = Self::extract_js_value(&flashvars, &text_regex)
                    .filter(|value| !value.is_empty())
                    .unwrap_or_else(|| Self::quality_from_url(&normalized));
                seen.entry(quality).or_insert(normalized);
            }
        }

        let document = Html::parse_document(html);
        let download_selector = Self::selector("#download_popup a[href*=\"/get_file/\"]")?;
        for element in document.select(&download_selector) {
            let href = element.value().attr("href").unwrap_or_default();
            let normalized = self.normalize_url(href);
            if normalized.is_empty() {
                continue;
            }
            let quality = Self::quality_from_url(&normalized);
            seen.entry(quality).or_insert(normalized);
        }

        let order = ["2160p", "1440p", "1080p", "720p", "480p", "360p", "240p"];
        let mut formats = Vec::new();

        for quality in order {
            let Some(url) = seen.get(quality) else {
                continue;
            };
            let format = VideoFormat::new(url.clone(), quality.to_string(), "mp4".to_string())
                .format_id(quality.to_string())
                .http_header("Referer".to_string(), page_url.to_string())
                .http_header("User-Agent".to_string(), BROWSER_UA.to_string());
            formats.push(format);
        }

        Ok(formats)
    }

    fn apply_detail_video(
        &self,
        mut item: VideoItem,
        html: &str,
        page_url: &str,
    ) -> Result<VideoItem> {
        let flashvars_regex = Self::regex(r#"(?s)var\s+flashvars\s*=\s*\{(.*?)\};"#)?;
        let value_regex = |key: &str| Self::regex(&format!(r#"{key}:\s*'((?:\\'|[^'])*)'"#));
        let flashvars = flashvars_regex
            .captures(html)
            .and_then(|value| value.get(1))
            .map(|value| value.as_str().to_string())
            .unwrap_or_default();

        let title_regex = value_regex("video_title")?;
        let category_regex = value_regex("video_categories")?;
        let tag_regex = value_regex("video_tags")?;
        let model_regex = value_regex("video_models")?;
        let preview_regex = value_regex("preview_url")?;
        let width_regex = value_regex("player_width")?;
        let height_regex = value_regex("player_height")?;

        let document = Html::parse_document(html);
        let uploader_selector =
            Self::selector(".block-details .block-user .username a[href*=\"/members/\"]")?;
        let info_span_selector = Self::selector(".block-details .info .item span")?;
        let category_selector = Self::selector(".block-details .info a[href*=\"/categories/\"]")?;
        let tag_selector = Self::selector(".block-details .info a[href*=\"/tags/\"]")?;
        let model_selector =
            Self::selector(".block-details .info a[href*=\"/fetish-models/\"]")?;

        if let Some(title) = Self::extract_js_value(&flashvars, &title_regex) {
            if !title.is_empty() {
                item.title = title;
            }
        }

        let formats = self.build_formats(html, page_url)?;
        if !formats.is_empty() {
            item = item.formats(formats);
        }

        let uploader_link = document.select(&uploader_selector).next();
        let uploader = uploader_link
            .as_ref()
            .map(|value| Self::text_of(value))
            .filter(|value| !value.is_empty());
        let uploader_url = uploader_link
            .and_then(|value| value.value().attr("href"))
            .map(|value| self.normalize_url(value));

        if let (Some(name), Some(url)) = (&uploader, &uploader_url) {
            Self::push_unique(
                &self.uploaders,
                FilterOption {
                    id: url.clone(),
                    title: name.clone(),
                },
            );
        }

        for span in document.select(&info_span_selector) {
            let text = Self::text_of(&span);
            if let Some(value) = text.strip_prefix("Views:") {
                if let Some(views) = Self::parse_views(value) {
                    item = item.views(views);
                }
            } else if let Some(value) = text.strip_prefix("Duration:") {
                let duration = Self::parse_duration(value.trim());
                if duration > 0 {
                    item.duration = duration;
                }
            }
        }

        let mut tags = item.tags.clone().unwrap_or_default();

        for element in document.select(&category_selector) {
            let title = Self::text_of(&element);
            let href = element.value().attr("href").unwrap_or_default();
            if title.is_empty() {
                continue;
            }
            tags.push(title.clone());
            Self::push_unique(
                &self.categories,
                FilterOption {
                    id: self.normalize_url(href),
                    title,
                },
            );
        }

        for element in document.select(&tag_selector) {
            let title = Self::text_of(&element);
            let href = element.value().attr("href").unwrap_or_default();
            if title.is_empty() {
                continue;
            }
            tags.push(title.clone());
            Self::push_unique(
                &self.tags,
                FilterOption {
                    id: self.normalize_url(href),
                    title,
                },
            );
        }

        for element in document.select(&model_selector) {
            let title = Self::text_of(&element);
            let href = element.value().attr("href").unwrap_or_default();
            if title.is_empty() {
                continue;
            }
            tags.push(title.clone());
            Self::push_unique(
                &self.models,
                FilterOption {
                    id: self.normalize_url(href),
                    title,
                },
            );
        }

        for raw_group in [category_regex, tag_regex, model_regex] {
            if let Some(values) = Self::extract_js_value(&flashvars, &raw_group) {
                for value in values.split(',') {
                    let clean = Self::collapse_whitespace(value.trim());
                    if !clean.is_empty() {
                        tags.push(clean);
                    }
                }
            }
        }

        tags.sort();
        tags.dedup();
        if !tags.is_empty() {
            item = item.tags(tags);
        }

        if let Some(uploader) = uploader {
            item = item.uploader(uploader);
        }
        if let Some(uploader_url) = uploader_url {
            item = item.uploader_url(uploader_url);
        }
        if item.thumb.is_empty() {
            if let Some(preview) = Self::extract_js_value(&flashvars, &preview_regex) {
                item.thumb = self.normalize_url(&preview);
            }
        }
        if item.aspectRatio.is_none() {
            let width = Self::extract_js_value(&flashvars, &width_regex)
                .and_then(|value| value.parse::<f32>().ok());
            let height = Self::extract_js_value(&flashvars, &height_regex)
                .and_then(|value| value.parse::<f32>().ok());
            if let (Some(width), Some(height)) = (width, height) {
                if height > 0.0 {
                    item = item.aspect_ratio(width / height);
                }
            }
        }

        Ok(item)
    }

    async fn enrich_video(&self, item: VideoItem, options: &ServerOptions) -> VideoItem {
        let page_url = item.url.clone();
        let original = item.clone();
        let mut requester =
            requester_or_default(options, "heavyfetish", "enrich_video.requester_missing");

        let html = match requester.get(&page_url, None).await {
            Ok(html) => html,
            Err(error) => {
                report_provider_error_background(
                    "heavyfetish",
                    "enrich_video.request",
                    &format!("url={page_url}; error={error}"),
                );
                return original;
            }
        };

        match self.apply_detail_video(item, &html, &page_url) {
            Ok(item) => item,
            Err(error) => {
                report_provider_error_background(
                    "heavyfetish",
                    "enrich_video.parse",
                    &format!("url={page_url}; error={error}"),
                );
                original
            }
        }
    }

    async fn fetch_items_for_url(
        &self,
        cache: VideoCache,
        url: String,
        per_page_limit: usize,
        options: &ServerOptions,
    ) -> Result<Vec<VideoItem>> {
        if let Some((time, items)) = cache.get(&url) {
            if time.elapsed().unwrap_or_default().as_secs() < 300 {
                return Ok(items.iter().take(per_page_limit).cloned().collect());
            }
        }

        let mut requester =
            requester_or_default(options, "heavyfetish", "fetch_items_for_url.requester_missing");
        let html = requester
            .get(&url, None)
            .await
            .map_err(|error| Error::from(format!("request failed for {url}: {error}")))?;

        let list_items = self.parse_list_videos(&html)?;
        if list_items.is_empty() {
            return Ok(vec![]);
        }

        let limited_items = list_items
            .into_iter()
            .take(per_page_limit.max(1))
            .collect::<Vec<_>>();

        let items = stream::iter(limited_items.into_iter().map(|item| {
            let provider = self.clone();
            let options = options.clone();
            async move { provider.enrich_video(item, &options).await }
        }))
        .buffer_unordered(4)
        .collect::<Vec<_>>()
        .await;

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

        Ok(items)
    }

    async fn get(
        &self,
        cache: VideoCache,
        page: u16,
        sort: &str,
        per_page_limit: usize,
        options: ServerOptions,
    ) -> Result<Vec<VideoItem>> {
        let target = self.resolve_option_target(&options);
        let url = self.build_url_for_target(&target, page, sort);
        self.fetch_items_for_url(cache, url, per_page_limit, &options)
            .await
    }

    async fn query(
        &self,
        cache: VideoCache,
        page: u16,
        sort: &str,
        query: &str,
        per_page_limit: usize,
        options: ServerOptions,
    ) -> Result<Vec<VideoItem>> {
        let target = self.resolve_query_target(query);
        let url = self.build_url_for_target(&target, page, sort);
        self.fetch_items_for_url(cache, url, per_page_limit, &options)
            .await
    }
}

#[async_trait]
impl Provider for HeavyfetishProvider {
    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 page = page.parse::<u16>().unwrap_or(1);
        let per_page_limit = per_page.parse::<usize>().unwrap_or(30);

        let result = match query {
            Some(query) if !query.trim().is_empty() => {
                self.query(cache, page, &sort, &query, per_page_limit, options)
                    .await
            }
            _ => self.get(cache, page, &sort, per_page_limit, options).await,
        };

        match result {
            Ok(videos) => videos,
            Err(error) => {
                report_provider_error("heavyfetish", "get_videos", &error.to_string()).await;
                vec![]
            }
        }
    }

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

#[cfg(test)]
mod tests {
    use super::*;

    fn provider() -> HeavyfetishProvider {
        HeavyfetishProvider {
            url: BASE_URL.to_string(),
            categories: Arc::new(RwLock::new(vec![FilterOption {
                id: "all".to_string(),
                title: "All".to_string(),
            }])),
            tags: Arc::new(RwLock::new(vec![FilterOption {
                id: "all".to_string(),
                title: "All".to_string(),
            }])),
            models: Arc::new(RwLock::new(vec![FilterOption {
                id: "all".to_string(),
                title: "All".to_string(),
            }])),
            uploaders: Arc::new(RwLock::new(vec![FilterOption {
                id: "all".to_string(),
                title: "All".to_string(),
            }])),
        }
    }

    #[test]
    fn builds_search_page_two_url() {
        let provider = provider();
        let url = provider.build_url_for_target(
            &QueryTarget {
                kind: TargetKind::Search,
                value: "adriana chechik".to_string(),
            },
            2,
            "rated",
        );

        assert_eq!(
            url,
            "https://heavyfetish.com/search/adriana+chechik/?from_videos=2&from_albums=2&sort_by=rating"
        );
    }

    #[test]
    fn preserves_list_thumb_when_detail_has_preview_image() {
        let provider = provider();
        let item = VideoItem::new(
            "120660".to_string(),
            "Example".to_string(),
            "https://heavyfetish.com/videos/120660/example/".to_string(),
            "heavyfetish".to_string(),
            "https://heavyfetish.com/list-thumb.jpg".to_string(),
            0,
        )
        .preview("https://heavyfetish.com/list-preview.mp4".to_string());

        let html = r#"
            <script>
                var flashvars = {
                    video_title: 'Example',
                    preview_url: 'https://heavyfetish.com/detail-preview.jpg',
                    player_width: '882',
                    player_height: '500.42553191489'
                };
            </script>
        "#;

        let enriched = provider
            .apply_detail_video(item, html, "https://heavyfetish.com/videos/120660/example/")
            .expect("detail parsing should succeed");

        assert_eq!(enriched.thumb, "https://heavyfetish.com/list-thumb.jpg");
        assert_eq!(
            enriched.preview.as_deref(),
            Some("https://heavyfetish.com/list-preview.mp4")
        );
    }
}