<script>
  import { writable, get } from "svelte/store"
  import { setContext, onMount } from "svelte"
  import { Layout, Heading, Body } from "@budibase/bbui"
  import ErrorSVG from "@budibase/frontend-core/assets/error.svg"
  import { Constants, CookieUtils } from "@budibase/frontend-core"
  import Component from "./Component.svelte"
  import SDK from "sdk"
  import {
    createContextStore,
    initialise,
    screenStore,
    authStore,
    routeStore,
    builderStore,
    themeStore,
    appStore,
    devToolsStore,
  } from "stores"
  import NotificationDisplay from "components/overlay/NotificationDisplay.svelte"
  import ConfirmationDisplay from "components/overlay/ConfirmationDisplay.svelte"
  import PeekScreenDisplay from "components/overlay/PeekScreenDisplay.svelte"
  import UserBindingsProvider from "components/context/UserBindingsProvider.svelte"
  import DeviceBindingsProvider from "components/context/DeviceBindingsProvider.svelte"
  import StateBindingsProvider from "components/context/StateBindingsProvider.svelte"
  import RowSelectionProvider from "components/context/RowSelectionProvider.svelte"
  import QueryParamsProvider from "components/context/QueryParamsProvider.svelte"
  import SettingsBar from "components/preview/SettingsBar.svelte"
  import SelectionIndicator from "components/preview/SelectionIndicator.svelte"
  import HoverIndicator from "components/preview/HoverIndicator.svelte"
  import CustomThemeWrapper from "./CustomThemeWrapper.svelte"
  import DNDHandler from "components/preview/DNDHandler.svelte"
  import KeyboardManager from "components/preview/KeyboardManager.svelte"
  import DevToolsHeader from "components/devtools/DevToolsHeader.svelte"
  import DevTools from "components/devtools/DevTools.svelte"

  // Provide contexts
  setContext("sdk", SDK)
  setContext("component", writable({}))
  setContext("context", createContextStore())

  let dataLoaded = false
  let permissionError = false

  // Determine if we should show devtools or not
  $: showDevTools =
    !$builderStore.inBuilder &&
    $devToolsStore.enabled &&
    !$routeStore.queryParams?.peek

  // Handle no matching route
  $: {
    if (dataLoaded && $routeStore.routerLoaded && !$routeStore.activeRoute) {
      if ($screenStore.screens.length) {
        // If we have some available screens, use the first screen which
        // represents the best route based on rank
        const route = $screenStore.screens[0].routing?.route
        if (!route) {
          permissionError = true
          console.error("No route found but screens exist")
        } else {
          permissionError = false
          routeStore.actions.navigate(route)
        }
      } else if ($authStore) {
        // If the user is logged in but has no screens, they don't have
        // permission to use the app
        permissionError = true
      } else {
        // If they have no screens and are not logged in, it probably means
        // they should log in to gain access
        const returnUrl = `${window.location.pathname}${window.location.hash}`
        CookieUtils.setCookie(Constants.Cookies.ReturnUrl, returnUrl)
        window.location = "/builder/auth/login"
      }
    }
  }

  // Load app config
  onMount(async () => {
    await initialise()
    await authStore.actions.fetchUser()
    dataLoaded = true
    if (get(builderStore).inBuilder) {
      builderStore.actions.notifyLoaded()
    } else {
      builderStore.actions.analyticsPing({ source: "app" })
    }
  })
</script>

{#if dataLoaded}
  <div
    id="spectrum-root"
    lang="en"
    dir="ltr"
    class="spectrum spectrum--medium spectrum--darkest {$themeStore.theme}"
  >
    <DeviceBindingsProvider>
      <UserBindingsProvider>
        <StateBindingsProvider>
          <RowSelectionProvider>
            <QueryParamsProvider>
              <!-- Settings bar can be rendered outside of device preview -->
              <!-- Key block needs to be outside the if statement or it breaks -->
              {#key $builderStore.selectedComponentId}
                {#if $builderStore.inBuilder}
                  <SettingsBar />
                {/if}
              {/key}

              <!-- Clip boundary for selection indicators -->
              <div
                id="clip-root"
                class:preview={$builderStore.inBuilder}
                class:tablet-preview={$builderStore.previewDevice === "tablet"}
                class:mobile-preview={$builderStore.previewDevice === "mobile"}
              >
                <!-- Actual app -->
                <div id="app-root">
                  {#if showDevTools}
                    <DevToolsHeader />
                  {/if}

                  <div id="app-body">
                    {#if permissionError}
                      <div class="error">
                        <Layout justifyItems="center" gap="S">
                          {@html ErrorSVG}
                          <Heading size="L">
                            You don't have permission to use this app
                          </Heading>
                          <Body size="S">
                            Ask your administrator to grant you access
                          </Body>
                        </Layout>
                      </div>
                    {:else if !$screenStore.activeLayout}
                      <div class="error">
                        <Layout justifyItems="center" gap="S">
                          {@html ErrorSVG}
                          <Heading size="L">
                            Something went wrong rendering your app
                          </Heading>
                          <Body size="S">
                            Get in touch with support if this issue persists
                          </Body>
                        </Layout>
                      </div>
                    {:else}
                      <CustomThemeWrapper>
                        {#key $screenStore.activeLayout._id}
                          <Component
                            isLayout
                            instance={$screenStore.activeLayout.props}
                          />
                        {/key}

                        <!--
                          Flatpickr needs to be inside the theme wrapper.
                          It also needs its own container because otherwise it hijacks
                          key events on the whole page. It is painful to work with.
                        -->
                        <div id="flatpickr-root" />

                        <!-- Modal container to ensure they sit on top -->
                        <div class="modal-container" />

                        <!-- Layers on top of app -->
                        <NotificationDisplay />
                        <ConfirmationDisplay />
                        <PeekScreenDisplay />
                      </CustomThemeWrapper>
                    {/if}

                    {#if showDevTools}
                      <DevTools />
                    {/if}
                  </div>
                </div>

                <!-- Preview and dev tools utilities  -->
                {#if $appStore.isDevApp}
                  <SelectionIndicator />
                {/if}
                {#if $builderStore.inBuilder || $devToolsStore.allowSelection}
                  <HoverIndicator />
                {/if}
                {#if $builderStore.inBuilder}
                  <DNDHandler />
                {/if}
              </div>
            </QueryParamsProvider>
          </RowSelectionProvider>
        </StateBindingsProvider>
      </UserBindingsProvider>
    </DeviceBindingsProvider>
  </div>
  <KeyboardManager />
{/if}

<style>
  #spectrum-root {
    padding: 0;
    margin: 0;
    overflow: hidden;
    height: 100%;
    width: 100%;
    background: transparent;
    display: flex;
    flex-direction: row;
    justify-content: center;
    align-items: center;
  }

  #clip-root {
    max-width: 100%;
    max-height: 100%;
    width: 100%;
    height: 100%;
    position: relative;
    overflow: hidden;
    background-color: transparent;
  }

  #app-root {
    overflow: hidden;
    height: 100%;
    width: 100%;
    display: flex;
    flex-direction: column;
    justify-content: flex-start;
    align-items: stretch;
  }

  #app-body {
    flex: 1 1 auto;
    display: flex;
    flex-direction: row;
    justify-content: flex-start;
    align-items: stretch;
    overflow: hidden;
  }

  .error {
    width: 100%;
    height: 100%;
    display: grid;
    place-items: center;
    z-index: 1;
    text-align: center;
    padding: 20px;
  }
  .error :global(svg) {
    fill: var(--spectrum-global-color-gray-500);
    width: 80px;
    height: 80px;
  }
  .error :global(h1),
  .error :global(p) {
    color: var(--spectrum-global-color-gray-800);
  }
  .error :global(p) {
    font-style: italic;
    margin-top: -0.5em;
  }
  .error :global(h1) {
    font-weight: 400;
  }

  /* Preview styles */
  /* The additional 6px of size is to account for 4px padding and 2px border */
  #clip-root.preview {
    padding: 2px;
  }
  #clip-root.tablet-preview {
    width: calc(1024px + 6px);
    height: calc(768px + 6px);
  }
  #clip-root.mobile-preview {
    width: calc(390px + 6px);
    height: calc(844px + 6px);
  }

  .preview #app-root {
    border: 1px solid var(--spectrum-global-color-gray-300);
    border-radius: 4px;
  }

  /* Print styles */
  @media print {
    #spectrum-root,
    #clip-root,
    #app-root,
    #app-body {
      overflow: visible !important;
    }
  }
</style>
