use crate::{file_watcher::FileWatcher, prelude::*, state::State as AppState, static_files};
use axum::{
    http::StatusCode,
    response::{Html, IntoResponse},
    routing::{get, post},
    Form, Router,
};
use maud::{html, Markup, PreEscaped, DOCTYPE};
use redact::Secret;
use serde::Deserialize;
use thiserror::Error;
use tower_http::trace::TraceLayer;
use tower_livereload::LiveReloadLayer;

#[derive(Error, Debug)]
pub enum NewRouterError {
    #[error("watcher error: {0}")]
    Watcher(#[from] notify::Error),
}

#[derive(Error, Debug)]
pub enum ReqError {}

impl IntoResponse for ReqError {
    fn into_response(self) -> axum::http::Response<axum::body::Body> {
        error!("webserver error: {:?}", self);
        (
            StatusCode::INTERNAL_SERVER_ERROR,
            // TODO: don't expose raw errors over the internet?
            format!("internal server error: {}", self),
        )
            .into_response()
    }
}

pub type ReqResult<T> = Result<T, ReqError>;

pub async fn router(
    state: AppState,
    with_watchers: bool,
) -> Result<(Router, Vec<Option<FileWatcher>>), NewRouterError> {
    let live_reload_layer: Option<LiveReloadLayer> = if with_watchers {
        Some(LiveReloadLayer::new())
    } else {
        None
    };

    let orl = || {
        if let Some(lr) = &live_reload_layer {
            Some(lr.reloader())
        } else {
            None
        }
    };

    let (static_file_service, static_file_watcher) = static_files::router(orl())?;

    let mut result = Router::new()
        .route("/", get(index))
        .route("/about", get(about))
        .route("/login", get(login))
        .route("/login", post(authenticate))
        .route("/register", get(register))
        .route("/register", post(create_user))
        .nest_service("/static", static_file_service)
        .layer(TraceLayer::new_for_http())
        .with_state(state.clone());

    if let Some(lr) = live_reload_layer {
        result = result.clone().layer(lr);
    }

    let watchers = vec![static_file_watcher];

    Ok((result, watchers))
}

fn stylesheet(url: &str) -> Markup {
    html! {
        link rel="stylesheet" type="text/css" href=(url);
    }
}

fn head(page_title: &str) -> Markup {
    html! {
        (DOCTYPE)
        meta charset="utf-8" {}
        meta name="viewport" content="width=device-width, initial-scale=1" {}
        title { (page_title) " - lyrs" }
        (stylesheet("/static/style.css"));

        script src="https://unpkg.com/htmx.org@1.9.12" integrity="sha384-ujb1lZYygJmzgSwoxRggbCHcjc0rB2XoQrxeTUQyRjrOnlCoYta87iKBWq3EsdM2" crossorigin="anonymous" defer {}

    }
}

fn foot() -> Markup {
    html! {
        footer class="p-2 border-t-2 border-surface0 flex overflow-x-scroll" {
            section {
                (PreEscaped("&copy; 2024 "))
                a .underline.text-mauve href="https://lyte.dev" { "lytedev" }
            }
            section .ml-auto {("Made with ❤️")}
        }
    }
}

fn page(title: &str, content: Markup) -> ReqResult<Html<String>> {
    Ok(Html(
    html! {
        (head(title))
        body .bg-bg.text-text.min-h-lvh.flex.flex-col.font-sans {
            header class="drop-shadow border-b-2 border-surface0 bg-blue-500 flex overflow-x-scroll" {
                a class="flex p-2 text-3xl font-mono text-mauve opacity-80 hover:bg-mauve hover:text-bg" href="/" { "lyrs" }
                nav class="flex flex-1 justify-start" {
                    a class="flex items-center p-2 hover:bg-mauve hover:text-bg" href="/login" { "Login" }
                    a class="flex items-center p-2 hover:bg-mauve hover:text-bg" href="/register" { "Register" }
                }
            }
            main class="flex flex-col flex-1 relative overflow-x-scroll bg-mantle" {
                (content)
            }
        }
        (foot())
    }.into_string()
    ))
}

async fn index() -> ReqResult<Html<String>> {
    page("index", html! { "Index" })
}

async fn about() -> ReqResult<Html<String>> {
    page("index", html! { "About" })
}

fn center_hero_form(title: &str, content: Markup, subform: Markup) -> Markup {
    html! {
        section class="hero grow" {
            form class="flex flex-col gap-2 w-full max-w-sm" method="post" {
                header {
                    h1 class="pb-2 text-center text-xl" { (title) }
                }
                (content)
                input class="bg-mauve" value="Submit" type="submit";
            }
            (subform)
        }
    }
}

fn labelled_input(label: &str, input: Markup) -> Markup {
    html! {
        label class="flex flex-col" {
            (label)
            (input)
        }
    }
}

async fn login() -> ReqResult<Html<String>> {
    let form = html! {
        (labelled_input("Username", html!{
            input class="input" type="text" name="username" autocomplete="username" required;
        }))
        (labelled_input("Password", html!{
            input class="input" type="password" name="password" autocomplete="current-password" required;
        }))
    };
    let subaction = html! {
        small class="mt-4" {
            "Need an account? "
            a href="/register" {"Get one"}
            "."
        }
    };
    page("login", center_hero_form("Login", form, subaction))
}

async fn register() -> ReqResult<Html<String>> {
    let form = html! {
        (labelled_input("Username", html!{
            input class="input" type="text" name="username" required;
        }))
        (labelled_input("Password", html!{
            input class="input" type="password" name="password" autocomplete="new-password" required;
        }))
    };
    let subaction = html! {
        small class="mt-4" {
            "Already have an account? "
            a href="/login" {"Login"}
            "."
        }
    };
    page("login", center_hero_form("Register", form, subaction))
}

#[derive(Deserialize, Debug)]
struct Creds {
    username: String,
    password: Secret<String>,
}

#[instrument]
async fn authenticate(Form(creds): Form<Creds>) -> ReqResult<Html<String>> {
    info!("login attempt");
    Ok(Html(
        html! {
            "no"
        }
        .into_string(),
    ))
}

#[instrument]
async fn create_user(Form(creds): Form<Creds>) -> ReqResult<Html<String>> {
    info!("registration attempt");
    Ok(Html(
        html! {
            "no"
        }
        .into_string(),
    ))
}