use crate::error::WebApiError;
use crate::models::{
  WebApiAdminCreateUserRequest, WebApiChangePasswordRequest, WebApiCreateSSOProviderRequest,
  WebApiInviteUserRequest, WebApiPutUserRequest,
};
use crate::response::WebApiResponse;
use crate::session::{self, UserSession};
use crate::{models::WebApiLoginRequest, AppState};
use axum::extract::Path;
use axum::http::{status, HeaderMap};
use axum::response::Result;
use axum::routing::delete;
use axum::Form;
use axum::{extract::State, routing::post, Router};
use axum_extra::extract::cookie::Cookie;
use axum_extra::extract::CookieJar;
use gotrue::params::{
  AdminDeleteUserParams, AdminUserParams, CreateSSOProviderParams, GenerateLinkParams,
  MagicLinkParams,
};
use gotrue_entity::dto::{GotrueTokenResponse, SignUpResponse, UpdateGotrueUserParams, User};
use tracing::info;

pub fn router() -> Router<AppState> {
  Router::new()
    .route("/signin", post(sign_in_handler))
    .route("/signup", post(sign_up_handler))
    .route("/login_refresh/:refresh_token", post(login_refresh_handler))
    .route("/logout", post(logout_handler))

    // user
    .route("/change_password", post(change_password_handler))
    .route("/oauth_login/:provider", post(post_oauth_login_handler))
    .route("/invite", post(invite_handler))
    .route("/open_app", post(open_app_handler))

    // admin
    .route("/admin/user", post(admin_add_user_handler))
    .route(
      "/admin/user/:user_uuid",
      delete(admin_delete_user_handler).put(admin_update_user_handler),
    )
    .route(
      "/admin/user/:email/generate-link",
      post(post_user_generate_link_handler),
    )
    .route("/admin/sso", post(admin_create_sso_handler))
    .route("/admin/sso/:provider_id", delete(admin_delete_sso_handler))
}

pub async fn admin_delete_sso_handler(
  State(state): State<AppState>,
  session: UserSession,
  Path(provider_id): Path<String>,
) -> Result<WebApiResponse<()>, WebApiError<'static>> {
  let _ = state
    .gotrue_client
    .admin_delete_sso_provider(&session.token.access_token, &provider_id)
    .await?;

  Ok(WebApiResponse::<()>::from_str("SSO Deleted".into()))
}

pub async fn admin_create_sso_handler(
  State(state): State<AppState>,
  session: UserSession,
  Form(param): Form<WebApiCreateSSOProviderRequest>,
) -> Result<WebApiResponse<()>, WebApiError<'static>> {
  let provider_params = CreateSSOProviderParams {
    type_: param.type_,
    metadata_url: param.metadata_url,
    ..Default::default()
  };

  let _ = state
    .gotrue_client
    .admin_create_sso_providers(&session.token.access_token, &provider_params)
    .await?;

  Ok(WebApiResponse::<()>::from_str("SSO Added".into()))
}

/// Generates a URL to facilitate login redirection to the AppFlowy app from a web browser.
///
/// This function creates a custom URL scheme that can be used in a web browser to open the
/// AppFlowy app and automatically handle user login based on the provided `UserSession`.
///
/// # Returns
/// A `Result` containing `HeaderMap` for HTTP redirection if successful, or `WebApiError` in case of failure.
///
/// # Example URL Format
/// `appflowy-flutter://login-callback#access_token=...&expires_at=...&expires_in=...&refresh_token=...&token_type=...`
///
/// The URL includes access token information and other relevant session details.
///
/// # Usage
/// The client application should implement handling for this URL format, typically through the
/// `sign_in_with_url` method in the `client-api` crate. See [client_api::Client::sign_in_with_url] for more details.
///
pub async fn open_app_handler(session: UserSession) -> Result<HeaderMap, WebApiError<'static>> {
  let app_sign_in_url = format!(
      "appflowy-flutter://login-callback#access_token={}&expires_at={}&expires_in={}&refresh_token={}&token_type={}",
        session.token.access_token,
        session.token.expires_at,
        session.token.expires_in,
        session.token.refresh_token,
        session.token.token_type,
  );
  Ok(htmx_redirect(&app_sign_in_url))
}

// Invite another user, this will trigger email sending
// to the target user
pub async fn invite_handler(
  State(state): State<AppState>,
  Form(param): Form<WebApiInviteUserRequest>,
) -> Result<WebApiResponse<()>, WebApiError<'static>> {
  state
    .gotrue_client
    .magic_link(
      &MagicLinkParams {
        email: param.email,
        ..Default::default()
      },
      Some("/".to_owned()),
    )
    .await?;
  Ok(WebApiResponse::<()>::from_str("Invitation sent".into()))
}

pub async fn change_password_handler(
  State(state): State<AppState>,
  session: UserSession,
  Form(param): Form<WebApiChangePasswordRequest>,
) -> Result<WebApiResponse<()>, WebApiError<'static>> {
  if param.new_password != param.confirm_password {
    return Err(WebApiError::new(
      status::StatusCode::BAD_REQUEST,
      "passwords do not match",
    ));
  }
  let _user = state
    .gotrue_client
    .update_user(
      &session.token.access_token,
      &UpdateGotrueUserParams {
        password: Some(param.new_password),
        ..Default::default()
      },
    )
    .await?;
  Ok(WebApiResponse::<()>::from_str("Password changed".into()))
}

pub async fn post_oauth_login_handler(
  header_map: HeaderMap,
  Path(provider): Path<String>,
) -> Result<WebApiResponse<String>, WebApiError<'static>> {
  let base_url = get_base_url(&header_map);
  let redirect_uri = format!("{}/web/oauth_login_redirect", base_url);

  let oauth_url = format!(
    "{}/authorize?provider={}&redirect_uri={}",
    base_url, &provider, redirect_uri
  );
  Ok(oauth_url.into())
}

pub async fn admin_update_user_handler(
  State(state): State<AppState>,
  session: UserSession,
  Path(user_uuid): Path<String>,
  Form(param): Form<WebApiPutUserRequest>,
) -> Result<WebApiResponse<User>, WebApiError<'static>> {
  let res = state
    .gotrue_client
    .admin_update_user(
      &session.token.access_token,
      &user_uuid,
      &AdminUserParams {
        password: Some(param.password.to_owned()),
        email_confirm: true,
        ..Default::default()
      },
    )
    .await?;
  Ok(res.into())
}

pub async fn post_user_generate_link_handler(
  State(state): State<AppState>,
  session: UserSession,
  Path(email): Path<String>,
) -> Result<String, WebApiError<'static>> {
  let res = state
    .gotrue_client
    .admin_generate_link(
      &session.token.access_token,
      &GenerateLinkParams {
        email,
        ..Default::default()
      },
    )
    .await?;
  Ok(res.action_link)
}

pub async fn admin_delete_user_handler(
  State(state): State<AppState>,
  session: UserSession,
  Path(user_uuid): Path<String>,
) -> Result<WebApiResponse<()>, WebApiError<'static>> {
  state
    .gotrue_client
    .admin_delete_user(
      &session.token.access_token,
      &user_uuid,
      &AdminDeleteUserParams {
        should_soft_delete: false,
      },
    )
    .await?;
  Ok(().into())
}

pub async fn admin_add_user_handler(
  State(state): State<AppState>,
  session: UserSession,
  Form(param): Form<WebApiAdminCreateUserRequest>,
) -> Result<WebApiResponse<()>, WebApiError<'static>> {
  let add_user_params = AdminUserParams {
    email: param.email,
    password: Some(param.password),
    email_confirm: !param.require_email_verification,
    ..Default::default()
  };
  let _user = state
    .gotrue_client
    .admin_add_user(&session.token.access_token, &add_user_params)
    .await?;
  Ok(WebApiResponse::<()>::from_str("User created".into()))
}

pub async fn login_refresh_handler(
  State(state): State<AppState>,
  jar: CookieJar,
  Path(refresh_token): Path<String>,
) -> Result<CookieJar, WebApiError<'static>> {
  let token = state
    .gotrue_client
    .token(&gotrue::grant::Grant::RefreshToken(
      gotrue::grant::RefreshTokenGrant { refresh_token },
    ))
    .await?;

  // Do another round of refresh_token to consume and invalidate the old one
  let token = state
    .gotrue_client
    .token(&gotrue::grant::Grant::RefreshToken(
      gotrue::grant::RefreshTokenGrant {
        refresh_token: token.refresh_token,
      },
    ))
    .await?;

  let new_session_id = uuid::Uuid::new_v4();
  let new_session = session::UserSession::new(new_session_id.to_string(), token);
  state.session_store.put_user_session(&new_session).await?;

  let mut cookie = Cookie::new("session_id", new_session_id.to_string());
  cookie.set_path("/");

  Ok(jar.add(cookie))
}

// login and set the cookie
// sign up if not exist
pub async fn sign_in_handler(
  State(state): State<AppState>,
  jar: CookieJar,
  Form(param): Form<WebApiLoginRequest>,
) -> Result<(CookieJar, HeaderMap, WebApiResponse<()>), WebApiError<'static>> {
  if param.password.is_empty() {
    let res = send_magic_link(State(state), &param.email).await?;
    return Ok((CookieJar::new(), HeaderMap::new(), res));
  }

  // Attempt to sign in with email and password
  let token = state
    .gotrue_client
    .token(&gotrue::grant::Grant::Password(
      gotrue::grant::PasswordGrant {
        email: param.email.to_owned(),
        password: param.password.to_owned(),
      },
    ))
    .await?;

  session_login(State(state), token, jar).await
}

pub async fn sign_up_handler(
  State(state): State<AppState>,
  jar: CookieJar,
  Form(param): Form<WebApiLoginRequest>,
) -> Result<(CookieJar, HeaderMap, WebApiResponse<()>), WebApiError<'static>> {
  if param.password.is_empty() {
    let res = send_magic_link(State(state), &param.email).await?;
    return Ok((CookieJar::new(), HeaderMap::new(), res));
  }

  let sign_up_res = state
    .gotrue_client
    .sign_up(&param.email, &param.password, Some("/"))
    .await?;

  match sign_up_res {
    // when GOTRUE_MAILER_AUTOCONFIRM=true, auto sign in
    SignUpResponse::Authenticated(token) => session_login(State(state), token, jar).await,
    SignUpResponse::NotAuthenticated(user) => {
      info!("user signed up and not authenticated: {:?}", user);
      Ok((
        jar,
        HeaderMap::new(),
        WebApiResponse::<()>::from_str("Email Verification Sent".into()),
      ))
    },
  }
}

pub async fn logout_handler(
  State(state): State<AppState>,
  jar: CookieJar,
) -> Result<(CookieJar, HeaderMap), WebApiError<'static>> {
  let session_id = jar
    .get("session_id")
    .ok_or(WebApiError::new(
      status::StatusCode::BAD_REQUEST,
      "no session_id cookie",
    ))?
    .value();

  state.session_store.del_user_session(session_id).await?;
  Ok((
    jar.remove(Cookie::from("session_id")),
    htmx_redirect("/web/login"),
  ))
}

fn htmx_redirect(url: &str) -> HeaderMap {
  let mut h = HeaderMap::new();
  h.insert("HX-Redirect", url.parse().unwrap());
  h
}

fn new_session_cookie(id: uuid::Uuid) -> Cookie<'static> {
  let mut cookie = Cookie::new("session_id", id.to_string());
  cookie.set_path("/");
  cookie
}

async fn session_login(
  State(state): State<AppState>,
  token: GotrueTokenResponse,
  jar: CookieJar,
) -> Result<(CookieJar, HeaderMap, WebApiResponse<()>), WebApiError<'static>> {
  let new_session_id = uuid::Uuid::new_v4();
  let new_session = session::UserSession::new(new_session_id.to_string(), token);
  state.session_store.put_user_session(&new_session).await?;

  Ok((
    jar.add(new_session_cookie(new_session_id)),
    htmx_redirect("/web/home"),
    ().into(),
  ))
}

async fn send_magic_link(
  State(state): State<AppState>,
  email: &str,
) -> Result<WebApiResponse<()>, WebApiError<'static>> {
  state
    .gotrue_client
    .magic_link(
      &MagicLinkParams {
        email: email.to_owned(),
        ..Default::default()
      },
      Some("/".to_owned()),
    )
    .await?;
  Ok(WebApiResponse::<()>::from_str("Magic Link Sent".into()))
}

fn get_base_url(header_map: &HeaderMap) -> String {
  let scheme = get_header_value_or_default(header_map, "x-scheme", "http");
  let host = get_header_value_or_default(header_map, "host", "localhost");

  format!("{}://{}", scheme, host)
}

fn get_header_value_or_default<'a>(
  header_map: &'a HeaderMap,
  header_name: &str,
  default: &'a str,
) -> &'a str {
  match header_map.get(header_name) {
    Some(v) => match v.to_str() {
      Ok(v) => v,
      Err(e) => {
        tracing::error!("failed to get header value {}: {}, {:?}", header_name, e, v);
        default
      },
    },
    None => default,
  }
}