/*
 * asklyphe-frontend searchbot.rs
 * - commonly used functions for querying the searchservice
 *
 * Copyright (C) 2025 Real Microsoft, LLC
 *
 * This program is free software: you can redistribute it and/or modify it under the terms of the GNU Affero General Public License as published by the Free Software Foundation, version 3.
 *
 * This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Affero General Public License for more details.
 *
 * You should have received a copy of the GNU Affero General Public License along with this program. If not, see <https://www.gnu.org/licenses/>.
*/

use std::collections::{BTreeMap, BTreeSet};
use std::ops::Deref;
use std::sync::Arc;
use std::sync::atomic::Ordering;
use asklyphe_common::nats;
use asklyphe_common::nats::bingservice::{BingServiceQuery, BingServiceRequest, BingServiceResponse};
use asklyphe_common::nats::comms;
use asklyphe_common::nats::searchservice::{SearchSrvcQuery, SearchSrvcRequest, SearchSrvcResponse};
use async_nats::jetstream;
use async_nats::jetstream::consumer::PullConsumer;
use async_nats::jetstream::stream::RetentionPolicy;
use futures::StreamExt;
use tokio::sync::Mutex;
use tracing::log::error;
use tracing::warn;
use ulid::Ulid;
use crate::routes::search::{Complications, ImageSearchResult, ImageSearchTemplate, SearchResult, SearchTemplate};
use crate::routes::UserInfo;
use crate::{BUILT_ON, GIT_COMMIT, ALPHA, VERSION, WEBSITE_COUNT, YEAR};

pub async fn update_website_counter(nats: Arc<jetstream::Context>) {
    let result = comms::query_service(comms::Query::SearchService(SearchSrvcQuery {
        request: SearchSrvcRequest::SiteCountRequest,
        replyto: "".to_string(),
    }), nats.deref(), false).await;

    if let Ok(comms::ServiceResponse::SearchService(result)) = result {
        match result {
            SearchSrvcResponse::OtherError(e) => {
                warn!("received error while asking for website count {e}");
            }
            SearchSrvcResponse::SiteCountResponse(count) => {
                WEBSITE_COUNT.store(count.count, Ordering::Relaxed);
            }
            _ => {
                warn!("received invalid response while asking for website count");
            }
        }
    }
}

pub async fn gather_search_results(nats: Arc<jetstream::Context>, query: &str, user_info: UserInfo, complications: Complications, engines: Option<Vec<String>>) -> SearchTemplate {
    let mut search_results = vec![];
    let mut note = None;

    let asklyphe = if let Some(engines) = &engines { engines.contains(&"asklyphe".to_string()) } else { true };
    let bing = if let Some(engines) = &engines { engines.contains(&"bing".to_string()) } else { true };
    let google = if let Some(engines) = &engines { engines.contains(&"google".to_string()) } else { true };

    // bing

    if bing {
        let result = comms::query_service(comms::Query::BingService(BingServiceQuery {
            request: BingServiceRequest::SearchRequest(nats::bingservice::BingSearchRequest {
                query: query.to_lowercase(),
            }),
            replyto: "".to_string(),
        }), nats.deref(), true).await;

        if let Ok(comms::ServiceResponse::BingService(result)) = result {
            match result {
                BingServiceResponse::InvalidRequest => {
                    note = Some("invalid request! report to developers!".to_string());
                }
                BingServiceResponse::OtherError(e) => {
                    error!("bing service gave unknown error {e}!!");
                    note = Some("internal server error! report to developers!".to_string());
                }
                BingServiceResponse::SearchResponse(results) => {
                    let result_count = results.results.len();

                    search_results.extend(results.results.into_iter().enumerate().map(|(i, v)| {
                        const MAX_LENGTH: usize = 800;
                        const MAX_URL_LENGTH: usize = 100;
                        SearchResult {
                            url: v.url,
                            title: v.title.map(|v| {
                                let initial = html_escape::decode_html_entities(&v).to_string();
                                let mut shortened = String::new();
                                if initial.len() > MAX_URL_LENGTH {
                                    for (i, c) in initial.chars().enumerate() {
                                        shortened.push(c);
                                        if i > MAX_URL_LENGTH {
                                            break;
                                        }
                                    }
                                    shortened.push_str("...");
                                } else {
                                    shortened = initial;
                                }
                                shortened
                            }),
                            description: v.description.map(|v| {
                                let initial = html_escape::decode_html_entities(&v).to_string();
                                let mut shortened = String::new();
                                if initial.len() > MAX_LENGTH {
                                    for (i, c) in initial.chars().enumerate() {
                                        shortened.push(c);
                                        if i > MAX_LENGTH {
                                            break;
                                        }
                                    }
                                    shortened.push_str("...");
                                } else {
                                    shortened = initial;
                                }
                                shortened
                            }),
                            percentage: format!("{:.2}", ((1.0 - (i as f64 / result_count as f64)) * 50.0) + 40.0),
                            value: format!("{}", i),
                            asklyphe: false,
                            bing: true,
                            google: false,
                        }
                    }));
                }
                BingServiceResponse::ImageResponse(_) => {
                    error!("bing service gave image response to search request!!");
                    note = Some("internal server error! report to developers!".to_string());
                }
            }
        }
    }
    
    // google
    
    if google {
        let result = comms::query_service(comms::Query::GoogleService(BingServiceQuery {
            request: BingServiceRequest::SearchRequest(nats::bingservice::BingSearchRequest {
                query: query.to_lowercase(),
            }),
            replyto: "".to_string(),
        }), nats.deref(), true).await;

        if let Ok(comms::ServiceResponse::BingService(result)) = result {
            match result {
                BingServiceResponse::InvalidRequest => {
                    note = Some("invalid request! report to developers!".to_string());
                }
                BingServiceResponse::OtherError(e) => {
                    error!("google service gave unknown error {e}!!");
                    note = Some("internal server error! report to developers!".to_string());
                }
                BingServiceResponse::SearchResponse(results) => {
                    let result_count = results.results.len();

                    search_results.extend(results.results.into_iter().enumerate().map(|(i, v)| {
                        const MAX_LENGTH: usize = 800;
                        const MAX_URL_LENGTH: usize = 100;
                        SearchResult {
                            url: v.url,
                            title: v.title.map(|v| {
                                let initial = html_escape::decode_html_entities(&v).to_string();
                                let mut shortened = String::new();
                                if initial.len() > MAX_URL_LENGTH {
                                    for (i, c) in initial.chars().enumerate() {
                                        shortened.push(c);
                                        if i > MAX_URL_LENGTH {
                                            break;
                                        }
                                    }
                                    shortened.push_str("...");
                                } else {
                                    shortened = initial;
                                }
                                shortened
                            }),
                            description: v.description.map(|v| {
                                let initial = html_escape::decode_html_entities(&v).to_string();
                                let mut shortened = String::new();
                                if initial.len() > MAX_LENGTH {
                                    for (i, c) in initial.chars().enumerate() {
                                        shortened.push(c);
                                        if i > MAX_LENGTH {
                                            break;
                                        }
                                    }
                                    shortened.push_str("...");
                                } else {
                                    shortened = initial;
                                }
                                shortened
                            }),
                            percentage: format!("{:.2}", ((1.0 - (i as f64 / result_count as f64)) * 50.0) + 40.0),
                            value: format!("{}", i),
                            asklyphe: false,
                            bing: false,
                            google: true,
                        }
                    }));
                }
                BingServiceResponse::ImageResponse(_) => {
                    error!("google service gave image response to search request!!");
                    note = Some("internal server error! report to developers!".to_string());
                }
            }
        }
    }

    // raw lyphe
    let mut query_time = 0.0;
    let mut page_rank_time = 0.0;
    let mut max_relevance = 0.0;
    let mut blocked = vec![];

    if asklyphe {
        let result = comms::query_service(comms::Query::SearchService(SearchSrvcQuery {
            request: SearchSrvcRequest::SearchRequest(nats::searchservice::SearchRequest {
                query: query.to_lowercase(),
            }),
            replyto: "".to_string(),
        }), nats.deref(), true).await;


        if let Ok(comms::ServiceResponse::SearchService(result)) = result {
            match result {
                SearchSrvcResponse::InvalidRequest => {
                    note = Some("invalid request! report to developers!".to_string());
                }
                SearchSrvcResponse::OtherError(e) => {
                    error!("search service gave unknown error {e}!!");
                    note = Some("unknown error! report to developers!".to_string());
                }
                SearchSrvcResponse::SearchResponse(results) => {
                    if note.is_none() {
                        note = if !results.exact_phrase_found {
                            Some("didn't find exact phrase, returning sites containing requested words".to_string())
                        } else {
                            None
                        };
                    }

                    query_time = results.total_query_seconds;
                    page_rank_time = results.pagerank_time_seconds;
                    max_relevance = results.max_relevance;

                    blocked = results.blocked;

                    search_results.extend(results.results.into_iter().map(|v| {
                        const MAX_LENGTH: usize = 800;
                        const MAX_URL_LENGTH: usize = 100;
                        SearchResult {
                            title: v.title.map(|v| {
                                let initial = html_escape::decode_html_entities(&v).to_string();
                                let mut shortened = String::new();
                                if initial.len() > MAX_URL_LENGTH {
                                    for (i, c) in initial.chars().enumerate() {
                                        shortened.push(c);
                                        if i > MAX_URL_LENGTH {
                                            break;
                                        }
                                    }
                                    shortened.push_str("...");
                                } else {
                                    shortened = initial;
                                }
                                shortened
                            }),
                            description: v.description.map(|v| {
                                let initial = html_escape::decode_html_entities(&v).to_string();
                                let mut shortened = String::new();
                                if initial.len() > MAX_LENGTH {
                                    for (i, c) in initial.chars().enumerate() {
                                        shortened.push(c);
                                        if i > MAX_LENGTH {
                                            break;
                                        }
                                    }
                                    shortened.push_str("...");
                                } else {
                                    shortened = initial;
                                }
                                shortened
                            }),
                            url: v.url,
                            percentage: format!("{:.2}", (v.relevance / results.max_relevance) * 100.0),
                            value: format!("{:.2}", v.relevance),
                            asklyphe: true,
                            bing: false,
                            google: false,
                        }
                    }));
                }
                _ => {
                    note = Some("bad response! report to developers!".to_string());
                }
            }
        } else {
            note = Some("unknown! report to developers!".to_string());
        }
    }

    search_results.sort_by(|a, b| {
        b.percentage.parse::<f64>().unwrap().total_cmp(&a.percentage.parse::<f64>().unwrap())
    });
    
    let mut already_included = BTreeMap::new();
    
    let mut remove = vec![];
    
    let mut add_bing = vec![];
    let mut add_google = vec![];
    
    for (i, result) in search_results.iter().enumerate() {
        let mut trimmed_url = result.url.clone();
        trimmed_url = trimmed_url.trim_end_matches('/').to_string();
        if already_included.contains_key(&trimmed_url) && !result.asklyphe {
            remove.push(i);
            let main = already_included.get(&trimmed_url).unwrap();
            if result.bing {
                add_bing.push(*main);
            }
            if result.google {
                add_google.push(*main);
            }
        }
        already_included.insert(trimmed_url, i);
    }

    for i in add_bing {
        search_results[i].bing = true;
    }
    for i in add_google {
        search_results[i].google = true;
    }

    for (i, rm) in remove.into_iter().enumerate() {
        search_results.remove(rm - i);
    }

    let theme = user_info.theme.clone();
    let querystr = url_encoded_data::stringify(&[("q", query)]);
    SearchTemplate {
        info: user_info,
        error: None,
        note,
        complications,
        search_query: query.to_string(),
        query_time,
        page_rank_time,
        max_relevance: format!("{:.2}", max_relevance),
        search_results,
        blocked,
        websearch_url: format!("/ask?{querystr}&js=0"),
        imagesearch_url: format!("/ask?{querystr}&js=0&stype=image"),
        version: VERSION.to_string(),
        git_commit: GIT_COMMIT.to_string(),
        built_on: BUILT_ON.to_string(),
        year: YEAR.to_string(),
        alpha: ALPHA,
        theme,
    }
}

pub async fn gather_image_results(nats: Arc<jetstream::Context>, query: &str, user_info: UserInfo, engines: Option<Vec<String>>, js: bool) -> ImageSearchTemplate {
    let mut search_results = vec![];
    let mut note = None;

    let bing = if let Some(engines) = &engines { engines.contains(&"bing".to_string()) } else { true };
    let google = if let Some(engines) = &engines { engines.contains(&"google".to_string()) } else { true };

    // google

    if google {
        let result = comms::query_service(comms::Query::GoogleService(BingServiceQuery {
            request: BingServiceRequest::ImageRequest(nats::bingservice::BingImageRequest {
                query: query.to_lowercase(),
            }),
            replyto: "".to_string(),
        }), nats.deref(), true).await;

        if let Ok(comms::ServiceResponse::BingService(result)) = result {
            match result {
                BingServiceResponse::InvalidRequest => {
                    note = Some("invalid request! report to developers!".to_string());
                }
                BingServiceResponse::OtherError(e) => {
                    error!("google service gave unknown error {e}!!");
                    note = Some("internal server error! report to developers!".to_string());
                }
                BingServiceResponse::ImageResponse(results) => {
                    search_results.extend(results.into_iter().enumerate().map(|(i, v)| {
                        const MAX_LENGTH: usize = 800;
                        const MAX_URL_LENGTH: usize = 100;
                        ImageSearchResult {
                            src: v.url.clone(),
                            url: v.url,
                            bing: false,
                            google: true,
                        }
                    }));
                }
                BingServiceResponse::SearchResponse(_) => {
                    error!("google service gave search response for image response!!");
                    note = Some("internal server error! report to developers!".to_string());
                }
            }
        }
    }

    // bing

    if bing {
        let result = comms::query_service(comms::Query::BingService(BingServiceQuery {
            request: BingServiceRequest::ImageRequest(nats::bingservice::BingImageRequest {
                query: query.to_lowercase(),
            }),
            replyto: "".to_string(),
        }), nats.deref(), true).await;

        if let Ok(comms::ServiceResponse::BingService(result)) = result {
            match result {
                BingServiceResponse::InvalidRequest => {
                    note = Some("invalid request! report to developers!".to_string());
                }
                BingServiceResponse::OtherError(e) => {
                    error!("bing service gave unknown error {e}!!");
                    note = Some("internal server error! report to developers!".to_string());
                }
                BingServiceResponse::ImageResponse(results) => {
                    search_results.extend(results.into_iter().enumerate().map(|(i, v)| {
                        const MAX_LENGTH: usize = 800;
                        const MAX_URL_LENGTH: usize = 100;
                        ImageSearchResult {
                            src: v.url.clone(),
                            url: v.url,
                            bing: true,
                            google: false,
                        }
                    }));
                }
                BingServiceResponse::SearchResponse(_) => {
                    error!("bing service gave search response for image response!!");
                    note = Some("internal server error! report to developers!".to_string());
                }
            }
        }
    }

    let mut already_included = BTreeMap::new();

    let mut remove = vec![];

    let mut add_bing = vec![];
    let mut add_google = vec![];

    for (i, result) in search_results.iter().enumerate() {
        let mut trimmed_url = result.url.clone();
        trimmed_url = trimmed_url.trim_end_matches('/').to_string();
        if already_included.contains_key(&trimmed_url) {
            remove.push(i);
            let main = already_included.get(&trimmed_url).unwrap();
            if result.bing {
                add_bing.push(*main);
            }
            if result.google {
                add_google.push(*main);
            }
        }
        already_included.insert(trimmed_url, i);
    }
    
    for i in add_bing {
        search_results[i].bing = true;
    }
    for i in add_google {
        search_results[i].google = true;
    }

    for (i, rm) in remove.into_iter().enumerate() {
        search_results.remove(rm - i);
    }

    for result in &mut search_results {
        let url = url_encoded_data::stringify(&[("url", &result.url)]);
        result.src = format!("/imgproxy?{}", url);
    }

    let theme = user_info.theme.clone();
    ImageSearchTemplate {
        info: user_info,
        error: None,
        note,
        search_query: query.to_string(),
        search_results,
        blocked: vec![],
        websearch_url: format!("/ask?q={query}&js={}", if js { 1 } else { 0 }),
        imagesearch_url: format!("/ask?q={query}&js={}&stype=image", if js { 1 } else { 0 }),
        version: VERSION.to_string(),
        git_commit: GIT_COMMIT.to_string(),
        built_on: BUILT_ON.to_string(),
        year: YEAR.to_string(),
        alpha: ALPHA,
        theme,
    }
}