(ns frontend.handler
  "Main ns that handles application startup. Closest ns that we have to a
  system. Contains a couple of small system components"
  (:require [electron.ipc :as ipc]
            [electron.listener :as el]
            [frontend.components.block :as block]
            [frontend.components.editor :as editor]
            [frontend.components.page :as page]
            [frontend.components.reference :as reference]
            [frontend.components.whiteboard :as whiteboard]
            [frontend.config :as config]
            [frontend.context.i18n :as i18n]
            [frontend.db.restore :as db-restore]
            [frontend.db.react :as react]
            [frontend.error :as error]
            [frontend.handler.command-palette :as command-palette]
            [frontend.handler.events :as events]
            [frontend.handler.file-based.events]
            [frontend.handler.file :as file-handler]
            [frontend.handler.global-config :as global-config-handler]
            [frontend.handler.notification :as notification]
            [frontend.handler.page :as page-handler]
            [frontend.handler.plugin-config :as plugin-config-handler]
            [frontend.handler.repo :as repo-handler]
            [frontend.handler.repo-config :as repo-config-handler]
            [frontend.handler.ui :as ui-handler]
            [frontend.handler.user :as user-handler]
            [frontend.idb :as idb]
            [frontend.mobile.util :as mobile-util]
            [frontend.modules.instrumentation.core :as instrument]
            [frontend.modules.shortcut.core :as shortcut]
            [frontend.state :as state]
            [frontend.util :as util]
            [frontend.util.persist-var :as persist-var]
            [goog.object :as gobj]
            [lambdaisland.glogi :as log]
            [promesa.core :as p]
            [frontend.mobile.core :as mobile]
            [cljs-bean.core :as bean]
            [frontend.handler.test :as test]
            [frontend.persist-db.browser :as db-browser]
            [frontend.persist-db :as persist-db]))

(defn- set-global-error-notification!
  []
  (when-not config/dev?
    (set! js/window.onerror
          (fn [message, _source, _lineno, _colno, error]
            (when-not (error/ignored? message)
              (js/console.error message)
              (log/error :exception error))))))

(defn- watch-for-date!
  []
  (let [f (fn []
            (let [repo (state/get-current-repo)]
              (when (or
                     (config/db-based-graph? repo)
                     (and (not (state/nfs-refreshing?))
                          (not (contains? (:file/unlinked-dirs @state/state)
                                          (config/get-repo-dir repo)))))
                ;; Don't create the journal file until user writes something
                (page-handler/create-today-journal!))))]
    (f)
    (js/setInterval f 5000)))

(defn restore-and-setup!
  [repo]
  (when repo
    (-> (p/let [_ (db-restore/restore-graph! repo)]
          (repo-config-handler/start {:repo repo}))
        (p/then
         (fn []
           ;; try to load custom css only for current repo
           (ui-handler/add-style-if-exists!)

           (->
            (p/do!
             (when (config/global-config-enabled?)
               (global-config-handler/start {:repo repo}))
             (when (config/plugin-config-enabled?)
               (plugin-config-handler/start)))
            (p/finally
              (fn []
                ;; install after config is restored
                (shortcut/refresh!)

                (state/set-db-restoring! false))))))
        (p/then
         (fn []
           (js/console.log "db restored, setting up repo hooks")

           (state/pub-event! [:modal/nfs-ask-permission])

           (page-handler/init-commands!)

           (watch-for-date!)
           (when (util/electron?) (file-handler/watch-for-current-graph-dir!))
           (state/pub-event! [:graph/restored (state/get-current-repo)])))
        (p/catch (fn [error]
                   (log/error :exception error))))))

(defn- handle-connection-change
  [e]
  (let [online? (= (gobj/get e "type") "online")]
    (state/set-online! online?)))

(defn set-network-watcher!
  []
  (js/window.addEventListener "online" handle-connection-change)
  (js/window.addEventListener "offline" handle-connection-change))

(defn- register-components-fns!
  []
  (state/set-page-blocks-cp! page/page-cp)
  (state/set-component! :block/linked-references reference/block-linked-references)
  (state/set-component! :whiteboard/tldraw-preview whiteboard/tldraw-preview)
  (state/set-component! :block/single-block block/single-block-cp)
  (state/set-component! :block/container block/block-container)
  (state/set-component! :block/reference block/block-reference)
  (state/set-component! :block/blocks-container block/blocks-container)
  (state/set-component! :block/properties-cp block/db-properties-cp)
  (state/set-component! :block/embed block/block-embed)
  (state/set-component! :block/page-cp block/page-cp)
  (state/set-component! :block/inline-text block/inline-text)
  (state/set-component! :editor/box editor/box)
  (command-palette/register-global-shortcut-commands))

(defn- get-system-info
  []
  (when (util/electron?)
    (p/let [info (ipc/ipc :system/info)]
      (state/set-state! :system/info (bean/->clj info)))))

(defn start!
  [render]
  (test/setup-test!)
  (get-system-info)
  (set-global-error-notification!)

  (set! js/window.onhashchange #(state/hide-custom-context-menu!)) ;; close context menu when page navs
  (register-components-fns!)
  (user-handler/restore-tokens-from-localstorage)
  (state/set-db-restoring! true)
  (when (util/electron?)
    (el/listen!))
  (render)
  (i18n/start)
  (instrument/init)
  (state/set-online! js/navigator.onLine)
  (set-network-watcher!)

  (-> (util/indexeddb-check?)
      (p/catch (fn [_e]
                 (notification/show! "Sorry, it seems that your browser doesn't support IndexedDB, we recommend to use latest Chrome(Chromium) or Firefox(Non-private mode)." :error false)
                 (state/set-indexedb-support! false))))
  (idb/start)

  (react/run-custom-queries-when-idle!)

  (events/run!)

  (p/do!
   (when (mobile-util/native-platform?)
     (mobile/mobile-preinit))
   (-> (p/let [_ (db-browser/start-db-worker!)
               repos (repo-handler/get-repos)
               _ (state/set-repos! repos)
               _ (mobile-util/hide-splash) ;; hide splash as early as ui is stable
               repo (or (state/get-current-repo) (:url (first repos)))
               _ (if (empty? repos)
                   (repo-handler/new-db! config/demo-repo)
                   (restore-and-setup! repo))]
         (when (util/electron?)
           (persist-db/run-export-periodically!))
         (when (mobile-util/native-platform?)
           (state/restore-mobile-theme!)))
       (p/catch (fn [e]
                  (js/console.error "Error while restoring repos: " e)))
       (p/finally (fn []
                    (state/set-db-restoring! false))))

   (util/<app-wake-up-from-sleep-loop (atom false))

   (persist-var/load-vars)))

(defn stop! []
  (prn "stop!"))

(defn quit-and-install-new-version!
  []
  (p/let [_ (ipc/invoke "set-quit-dirty-state" false)]
    (ipc/ipc :quitAndInstall)))