use crate::{site::check_application_question, PerformCrud};
use actix_web::web::Data;
use lemmy_api_common::{
  context::LemmyContext,
  site::{EditSite, SiteResponse},
  utils::{
    is_admin,
    local_site_rate_limit_to_rate_limit_config,
    local_site_to_slur_regex,
    local_user_view_from_jwt,
    site_description_length_check,
  },
};
use lemmy_db_schema::{
  source::{
    actor_language::SiteLanguage,
    federation_allowlist::FederationAllowList,
    federation_blocklist::FederationBlockList,
    local_site::{LocalSite, LocalSiteUpdateForm},
    local_site_rate_limit::{LocalSiteRateLimit, LocalSiteRateLimitUpdateForm},
    local_user::LocalUser,
    site::{Site, SiteUpdateForm},
    tagline::Tagline,
  },
  traits::Crud,
  utils::{diesel_option_overwrite, diesel_option_overwrite_to_url, naive_now},
  ListingType,
  RegistrationMode,
};
use lemmy_db_views::structs::SiteView;
use lemmy_utils::{
  error::LemmyError,
  utils::{slurs::check_slurs_opt, validation::is_valid_body_field},
};

#[async_trait::async_trait(?Send)]
impl PerformCrud for EditSite {
  type Response = SiteResponse;

  #[tracing::instrument(skip(context))]
  async fn perform(&self, context: &Data<LemmyContext>) -> Result<SiteResponse, LemmyError> {
    let data: &EditSite = self;
    let local_user_view = local_user_view_from_jwt(&data.auth, context).await?;
    let site_view = SiteView::read_local(context.pool()).await?;
    let local_site = site_view.local_site;
    let site = site_view.site;

    // Make sure user is an admin
    is_admin(&local_user_view)?;

    let slur_regex = local_site_to_slur_regex(&local_site);

    check_slurs_opt(&data.name, &slur_regex)?;
    check_slurs_opt(&data.description, &slur_regex)?;

    if let Some(desc) = &data.description {
      site_description_length_check(desc)?;
    }

    is_valid_body_field(&data.sidebar)?;

    let application_question = diesel_option_overwrite(&data.application_question);
    check_application_question(
      &application_question,
      data
        .registration_mode
        .unwrap_or(local_site.registration_mode),
    )?;

    if let Some(listing_type) = &data.default_post_listing_type {
      // only allow all or local as default listing types
      if listing_type != &ListingType::All && listing_type != &ListingType::Local {
        return Err(LemmyError::from_message(
          "invalid_default_post_listing_type",
        ));
      }
    }

    if let Some(discussion_languages) = data.discussion_languages.clone() {
      SiteLanguage::update(context.pool(), discussion_languages.clone(), &site).await?;
    }

    let name = data.name.clone();
    let site_form = SiteUpdateForm::builder()
      .name(name)
      .sidebar(diesel_option_overwrite(&data.sidebar))
      .description(diesel_option_overwrite(&data.description))
      .icon(diesel_option_overwrite_to_url(&data.icon)?)
      .banner(diesel_option_overwrite_to_url(&data.banner)?)
      .updated(Some(Some(naive_now())))
      .build();

    Site::update(context.pool(), site.id, &site_form)
      .await
      // Ignore errors for all these, so as to not throw errors if no update occurs
      // Diesel will throw an error for empty update forms
      .ok();

    let local_site_form = LocalSiteUpdateForm::builder()
      .enable_downvotes(data.enable_downvotes)
      .registration_mode(data.registration_mode)
      .enable_nsfw(data.enable_nsfw)
      .community_creation_admin_only(data.community_creation_admin_only)
      .require_email_verification(data.require_email_verification)
      .application_question(application_question)
      .private_instance(data.private_instance)
      .default_theme(data.default_theme.clone())
      .default_post_listing_type(data.default_post_listing_type)
      .legal_information(diesel_option_overwrite(&data.legal_information))
      .application_email_admins(data.application_email_admins)
      .hide_modlog_mod_names(data.hide_modlog_mod_names)
      .updated(Some(Some(naive_now())))
      .slur_filter_regex(diesel_option_overwrite(&data.slur_filter_regex))
      .actor_name_max_length(data.actor_name_max_length)
      .federation_enabled(data.federation_enabled)
      .federation_debug(data.federation_debug)
      .federation_worker_count(data.federation_worker_count)
      .captcha_enabled(data.captcha_enabled)
      .captcha_difficulty(data.captcha_difficulty.clone())
      .reports_email_admins(data.reports_email_admins)
      .build();

    let update_local_site = LocalSite::update(context.pool(), &local_site_form)
      .await
      .ok();

    let local_site_rate_limit_form = LocalSiteRateLimitUpdateForm::builder()
      .message(data.rate_limit_message)
      .message_per_second(data.rate_limit_message_per_second)
      .post(data.rate_limit_post)
      .post_per_second(data.rate_limit_post_per_second)
      .register(data.rate_limit_register)
      .register_per_second(data.rate_limit_register_per_second)
      .image(data.rate_limit_image)
      .image_per_second(data.rate_limit_image_per_second)
      .comment(data.rate_limit_comment)
      .comment_per_second(data.rate_limit_comment_per_second)
      .search(data.rate_limit_search)
      .search_per_second(data.rate_limit_search_per_second)
      .build();

    LocalSiteRateLimit::update(context.pool(), &local_site_rate_limit_form)
      .await
      .ok();

    // Replace the blocked and allowed instances
    let allowed = data.allowed_instances.clone();
    FederationAllowList::replace(context.pool(), allowed).await?;
    let blocked = data.blocked_instances.clone();
    FederationBlockList::replace(context.pool(), blocked).await?;

    // TODO can't think of a better way to do this.
    // If the server suddenly requires email verification, or required applications, no old users
    // will be able to log in. It really only wants this to be a requirement for NEW signups.
    // So if it was set from false, to true, you need to update all current users columns to be verified.

    let old_require_application =
      local_site.registration_mode == RegistrationMode::RequireApplication;
    let new_require_application = update_local_site
      .as_ref()
      .map(|ols| ols.registration_mode == RegistrationMode::RequireApplication)
      .unwrap_or(false);
    if !old_require_application && new_require_application {
      LocalUser::set_all_users_registration_applications_accepted(context.pool())
        .await
        .map_err(|e| LemmyError::from_error_message(e, "couldnt_set_all_registrations_accepted"))?;
    }

    let new_require_email_verification = update_local_site
      .as_ref()
      .map(|ols| ols.require_email_verification)
      .unwrap_or(false);
    if !local_site.require_email_verification && new_require_email_verification {
      LocalUser::set_all_users_email_verified(context.pool())
        .await
        .map_err(|e| LemmyError::from_error_message(e, "couldnt_set_all_email_verified"))?;
    }

    let new_taglines = data.taglines.clone();
    let taglines = Tagline::replace(context.pool(), local_site.id, new_taglines).await?;

    let site_view = SiteView::read_local(context.pool()).await?;

    let rate_limit_config =
      local_site_rate_limit_to_rate_limit_config(&site_view.local_site_rate_limit);
    context
      .settings_updated_channel()
      .send(rate_limit_config)
      .await?;

    let res = SiteResponse {
      site_view,
      taglines,
    };

    Ok(res)
  }
}