use askama_axum::{Response, Template};
use axum::{
    extract::{Path, State},
    response::{Html, IntoResponse, Redirect},
    Extension,
};
use http::StatusCode;
use sqlx::SqlitePool;

use crate::{
    middlewares::is_authorized,
    user::{get_other_roles_display, get_user_roles_display},
    UserData,
};

#[derive(Template)]
#[template(path = "profile.html")]
struct ProfileTemplate {
    logged_in: bool,
    name: String,
    user: UserData,
    user_roles: Vec<crate::user::UserRolesDisplay>,
}

#[derive(Template)]
#[template(path = "user.html")]
struct UserProfileTemplate {
    logged_in: bool,
    name: String,
    user_roles: Vec<crate::user::UserRolesDisplay>,
    profile: UserData,
    profile_roles: Vec<crate::user::UserRolesDisplay>,
    non_profile_roles: Vec<crate::user::UserRolesDisplay>,
}

struct HtmlTemplate<T>(T);

impl<T> IntoResponse for HtmlTemplate<T>
where
    T: Template,
{
    fn into_response(self) -> Response {
        match self.0.render() {
            Ok(html) => Html(html).into_response(),
            Err(err) => (
                StatusCode::INTERNAL_SERVER_ERROR,
                format!("Failed to render template. Error: {}", err),
            )
                .into_response(),
        }
    }
}

#[derive(Template)]
#[template(path = "index.html")]
struct IndexTemplate {
    logged_in: bool,
    name: String,
}

#[derive(Template)]
#[template(path = "dashboard.html")]
struct DashboardTemplate {
    logged_in: bool,
    name: String,
    user_roles: Vec<crate::user::UserRolesDisplay>,
}

pub async fn index(
    State(db_pool): State<SqlitePool>,
    Extension(user_data): Extension<Option<UserData>>,
) -> impl IntoResponse {
    let name = user_data.as_ref().map(|s| s.name.clone()).unwrap_or_default();
    let logged_in = user_data.is_some();

    if is_authorized("/dashboard", user_data, db_pool).await {
        Redirect::to("/dashboard").into_response()
    } else {
        let template = IndexTemplate { logged_in, name };
        HtmlTemplate(template).into_response()
    }
}

pub async fn dashboard(
    State(db_pool): State<SqlitePool>,
    Extension(user_data): Extension<Option<UserData>>,
) -> impl IntoResponse {
    let userid = user_data.as_ref().map(|s| s.id.clone()).unwrap_or_default();
    let name = user_data.as_ref().map(|s| s.name.clone()).unwrap_or_default();
    let logged_in = user_data.is_some();

    if is_authorized("/dashboard", user_data, db_pool.clone()).await {
        // Get user roles
        let user_roles = get_user_roles_display(userid, &db_pool.clone()).await;

        let template = DashboardTemplate { logged_in, name, user_roles };
        HtmlTemplate(template).into_response()
    } else {
        Redirect::to("/").into_response()
    }
}

/// Handles the profile page.
pub async fn profile(
    State(db_pool): State<SqlitePool>,
    Extension(user_data): Extension<Option<UserData>>,
) -> impl IntoResponse {
    // Extract the user's name from the user data.
    let userid = user_data.as_ref().map(|s| s.id.clone()).unwrap_or_default();
    let name = user_data.as_ref().map(|s| s.name.clone()).unwrap_or_default();
    let logged_in = user_data.is_some();

    if logged_in {
        // Extract the user data.
        let user = user_data.as_ref().unwrap().clone();

        if is_authorized("/profile", user_data, db_pool.clone()).await {
        // Get user roles
        let user_roles = get_user_roles_display(userid, &db_pool.clone()).await;

        // Create the profile template.
            let template = ProfileTemplate {
                logged_in,
                name,
                user: user.clone(),
                user_roles,
            };
            return HtmlTemplate(template).into_response();
        } else {
            Redirect::to("/").into_response()
        }
    } else {
        Redirect::to("/").into_response()
    }
}

pub async fn user_profile(
    Path(user_id): Path<i64>,
    State(db_pool): State<SqlitePool>,
    Extension(user_data): Extension<Option<UserData>>,
) -> impl IntoResponse {
    // Extract the user's name from the user data.
    let userid = user_data.as_ref().map(|s| s.id.clone()).unwrap_or_default();
    let name = user_data.as_ref().map(|s| s.name.clone()).unwrap_or_default();
    let logged_in = user_data.is_some();

    // Extract the user data.
    let user = sqlx::query_as!(UserData, "SELECT * FROM users WHERE id = ?", user_id)
        .fetch_one(&db_pool)
        .await
        .unwrap();

    if is_authorized("/users", user_data, db_pool.clone()).await {
        // Get logged in user roles
        let user_roles = get_user_roles_display(userid, &db_pool.clone()).await;

        // Get user roles
        let profile_roles = get_user_roles_display(user_id, &db_pool.clone()).await;

        // Get roles user does not have
        let non_profile_roles = get_other_roles_display(user_id, &db_pool.clone()).await;

        // Create the profile template.
        let template = UserProfileTemplate {
            logged_in,
            name,
            user_roles,
            profile: user,
            profile_roles,
            non_profile_roles,
        };
        return HtmlTemplate(template).into_response();
    } else {
        Redirect::to("/").into_response()
    }
}

#[derive(Template)]
#[template(path = "useradmin.html")]
struct UserAdminTemplate {
    logged_in: bool,
    name: String,
    users: Vec<UserData>,
    user_roles: Vec<crate::user::UserRolesDisplay>,
}

pub async fn useradmin(
    Extension(user_data): Extension<Option<UserData>>,
    State(db_pool): State<SqlitePool>,
) -> impl IntoResponse {
    let user_name = user_data.as_ref().map(|s| s.name.clone());
    let logged_in = user_name.is_some();
    let name = user_name.unwrap_or_default();

    let users = sqlx::query_as::<_, UserData>("SELECT * FROM users")
        .fetch_all(&db_pool)
        .await
        .unwrap();

    let user_id = user_data.as_ref().map(|s| s.id.clone()).unwrap_or_default();

    if is_authorized("/useradmin", user_data, db_pool.clone()).await {
        // Get user roles
        let user_roles = get_user_roles_display(user_id, &db_pool.clone()).await;

        let template = UserAdminTemplate {
            logged_in,
            name,
            users,
            user_roles,
        };
        HtmlTemplate(template).into_response()
    } else {
        Redirect::to("/").into_response()
    }
}

#[derive(Template)]
#[template(path = "about.html")]
struct AboutTemplate {
    logged_in: bool,
    name: String,
}

pub async fn about(Extension(user_data): Extension<Option<UserData>>) -> impl IntoResponse {
    let user_name = user_data.map(|s| s.name);
    let logged_in = user_name.is_some();
    let name = user_name.unwrap_or_default();

    let template = AboutTemplate { logged_in, name };
    HtmlTemplate(template)
}

#[derive(Template)]
#[template(path = "contactus.html")]
struct ContactTemplate {
    logged_in: bool,
    name: String,
}

pub async fn contact(Extension(user_data): Extension<Option<UserData>>) -> impl IntoResponse {
    let user_name = user_data.map(|s| s.name);
    let logged_in = user_name.is_some();
    let name = user_name.unwrap_or_default();

    let template = ContactTemplate { logged_in, name };
    HtmlTemplate(template)
}

#[derive(Template)]
#[template(path = "cottagecalendar.html")]
struct CottageCalendarTemplate {
    logged_in: bool,
    name: String,
    user_roles: Vec<crate::user::UserRolesDisplay>,
}

pub async fn cottagecalendar(
    Extension(user_data): Extension<Option<UserData>>,
    State(db_pool): State<SqlitePool>,
) -> impl IntoResponse {
    let user_name = user_data.as_ref().map(|s| s.name.clone());
    let logged_in = user_name.is_some();
    let name = user_name.unwrap_or_default();

    let user_id = user_data.as_ref().map(|s| s.id.clone()).unwrap_or_default();

    if is_authorized("/cottagecalendar", user_data, db_pool.clone()).await {
        // Get user roles
        let user_roles = get_user_roles_display(user_id, &db_pool.clone()).await;

        let template = CottageCalendarTemplate { logged_in, name, user_roles };
        HtmlTemplate(template).into_response()
    } else {
        Redirect::to("/").into_response()
    }
}