use std::sync::{Arc, Mutex};

use axum::{
    http::{Response, StatusCode},
    response::{IntoResponse, Redirect},
    routing::{get, post, Router},
    Extension,
};
use rand::{seq::SliceRandom, thread_rng, RngCore, SeedableRng};
use rand_chacha::ChaCha8Rng;
use rand_core::OsRng;
use sqlx::PgPool;
use std::error::Error;
use tower_http::services::ServeDir;

use crate::{
    auth::{auth, logout_response, post_login, post_signup},
    database::{
        link::{Link, LinkType},
        PsqlData,
    },
};

use super::{
    admin,
    blog::{self, get_articles_date_sorted},
    garden,
    templates::{
        AboutTemplate, AiTemplate, BlogrollTemplate, ContactTemplate, GiftsTemplate, HomeTemplate,
        HtmlTemplate, InterestsTemplate, LinksPageTemplate, LoginTemplate, NowTemplate,
        ResumeTemplate, SignupTemplate, UsesTemplate, WorkTemplate,
    },
};

pub fn get_router(pool: PgPool) -> Router {
    let assets_path = std::env::current_dir().unwrap();

    let random = ChaCha8Rng::seed_from_u64(OsRng.next_u64());
    let middleware_database = pool.clone();

    Router::new()
        .nest("/blog", blog::get_router())
        .nest("/garden", garden::get_router())
        .nest("/admin", admin::get_router())
        .nest_service(
            "/assets",
            ServeDir::new(format!("{}/assets", assets_path.to_str().unwrap())),
        )
        .route("/", get(home))
        .route("/now", get(now))
        .route("/about", get(about))
        .route("/contact", get(contact))
        .route("/uses", get(uses))
        .route("/ai", get(ai))
        .route("/blogroll", get(blogroll))
        .route("/links", get(links))
        .route("/interests", get(interests))
        .route("/resume", get(resume))
        .route("/gifts", get(gifts))
        .route("/hire", get(work))
        .route("/login", get(get_login).post(post_login))
        .route("/signup", get(get_signup).post(post_signup))
        .route("/logout", post(logout_response))
        .route(
            "/robots.txt",
            get(|| async { Redirect::permanent("/assets/robots.txt") }),
        )
        .layer(axum::middleware::from_fn(move |req, next| {
            auth(req, next, middleware_database.clone())
        }))
        .layer(Extension(pool))
        .layer(Extension(Arc::new(Mutex::new(random))))
}

async fn home(Extension(pool): Extension<PgPool>) -> impl IntoResponse {
    let mut articles = get_articles_date_sorted(&pool).await.unwrap();
    articles.truncate(5);
    HtmlTemplate(HomeTemplate {
        recent_articles: articles,
    })
}

async fn now() -> impl IntoResponse {
    HtmlTemplate(NowTemplate {})
}

async fn about() -> impl IntoResponse {
    HtmlTemplate(AboutTemplate {})
}

async fn contact() -> impl IntoResponse {
    HtmlTemplate(ContactTemplate {})
}

async fn uses() -> impl IntoResponse {
    HtmlTemplate(UsesTemplate {})
}

async fn ai() -> impl IntoResponse {
    HtmlTemplate(AiTemplate {})
}

async fn interests() -> impl IntoResponse {
    HtmlTemplate(InterestsTemplate {})
}

async fn resume() -> impl IntoResponse {
    HtmlTemplate(ResumeTemplate {})
}

async fn work() -> impl IntoResponse {
    HtmlTemplate(WorkTemplate {})
}

async fn gifts() -> impl IntoResponse {
    HtmlTemplate(GiftsTemplate {})
}

async fn blogroll(Extension(pool): Extension<PgPool>) -> impl IntoResponse {
    let blogroll_page = BlogrollTemplate {
        blogs: match get_links_as_list(&pool, LinkType::BLOG).await {
            Ok(list) => list,
            Err(_) => Vec::new(),
        },
    };
    HtmlTemplate(blogroll_page)
}

async fn links(Extension(pool): Extension<PgPool>) -> impl IntoResponse {
    let links_page = LinksPageTemplate {
        articles: match get_links_as_list(&pool, LinkType::ARTICLE).await {
            Ok(list) => list,
            Err(_) => Vec::new(),
        },
    };
    HtmlTemplate(links_page)
}

pub async fn get_links_as_list(
    pool: &PgPool,
    link_type: LinkType,
) -> Result<Vec<Link>, Box<dyn Error>> {
    let mut links: Vec<Link> = match Link::read_all(pool).await {
        Ok(a) => a.iter().map(|x| *x.clone()).collect(),
        Err(_) => Vec::new(),
    };

    let mut rng = thread_rng();
    links.shuffle(&mut rng);

    let list: Vec<Link> = links
        .into_iter()
        .filter(|link| link.link_type == link_type)
        .collect();
    Ok(list)
}

pub fn error_page(err: &dyn std::error::Error) -> impl IntoResponse {
    Response::builder()
        .status(StatusCode::INTERNAL_SERVER_ERROR)
        .body(format!("Err: {}", err))
        .unwrap()
}

pub async fn get_login() -> impl IntoResponse {
    HtmlTemplate(LoginTemplate { username: None })
}

pub async fn get_signup() -> impl IntoResponse {
    HtmlTemplate(SignupTemplate {})
}