import { createMemo, createSignal, For, onCleanup, onMount, Show } from 'solid-js'
import { useLocalize } from '../../context/localize'
import { clsx } from 'clsx'
import { Title } from '@solidjs/meta'
import type { Shout, Topic } from '../../graphql/types.gen'
import { apiClient } from '../../utils/apiClient'
import { useRouter } from '../../stores/router'
import { useEditorContext } from '../../context/editor'
import { Editor, Panel, TopicSelect, UploadModalContent } from '../Editor'
import { Icon } from '../_shared/Icon'
import { Button } from '../_shared/Button'
import styles from './Edit.module.scss'
import { useSession } from '../../context/session'
import { Modal } from '../Nav/Modal'
import { hideModal, showModal } from '../../stores/ui'
import { imageProxy } from '../../utils/imageProxy'
import { GrowingTextarea } from '../_shared/GrowingTextarea'
import { VideoUploader } from '../Editor/VideoUploader'
import { VideoPlayer } from '../_shared/VideoPlayer'
import { slugify } from '../../utils/slugify'

type Props = {
  shout: Shout
}

const handleScrollTopButtonClick = (e) => {
  e.preventDefault()
  window.scrollTo({
    top: 0,
    behavior: 'smooth'
  })
}

const EMPTY_TOPIC: Topic = {
  id: -1,
  slug: ''
}

export const EditView = (props: Props) => {
  const { t } = useLocalize()
  const { user } = useSession()
  const [isScrolled, setIsScrolled] = createSignal(false)
  const [topics, setTopics] = createSignal<Topic[]>(null)
  const [coverImage, setCoverImage] = createSignal<string>(null)
  const [media, setMedia] = createSignal<string>(props.shout.media)
  const { page } = useRouter()
  const {
    form,
    formErrors,
    actions: { setForm, setFormErrors }
  } = useEditorContext()

  const shoutTopics = props.shout.topics || []

  setForm({
    shoutId: props.shout.id,
    slug: props.shout.slug,
    title: props.shout.title,
    subtitle: props.shout.subtitle,
    selectedTopics: shoutTopics,
    mainTopic: shoutTopics.find((topic) => topic.slug === props.shout.mainTopic) || EMPTY_TOPIC,
    body: props.shout.body,
    coverImageUrl: props.shout.cover,
    media: media(),
    layout: props.shout.layout
  })

  onMount(async () => {
    const allTopics = await apiClient.getAllTopics()
    setTopics(allTopics)
  })

  onMount(() => {
    const handleScroll = () => {
      setIsScrolled(window.scrollY > 0)
    }

    window.addEventListener('scroll', handleScroll, { passive: true })
    onCleanup(() => {
      window.removeEventListener('scroll', handleScroll)
    })
  })

  const handleTitleInputChange = (value) => {
    setForm('title', value)
    setForm('slug', slugify(value))
    if (value) {
      setFormErrors('title', '')
    }
  }

  const handleSlugInputChange = (e) => {
    const slug = e.currentTarget.value
    setForm('slug', slug)
  }

  const handleUploadModalContentCloseSetCover = (imgUrl: string) => {
    hideModal()
    setCoverImage(imageProxy(imgUrl))
    setForm('coverImageUrl', imgUrl)
  }
  const handleDeleteCoverImage = () => {
    setForm('coverImageUrl', '')
    setCoverImage(null)
  }

  const handleTopicSelectChange = (newSelectedTopics) => {
    if (newSelectedTopics.length === 0) {
      setForm('mainTopic', EMPTY_TOPIC)
    } else if (
      form.selectedTopics.length === 0 ||
      newSelectedTopics.every((topic) => topic.id !== form.mainTopic.id)
    ) {
      setForm('mainTopic', newSelectedTopics[0])
    }

    if (newSelectedTopics.length > 0) {
      setFormErrors('selectedTopics', '')
    }
    setForm('selectedTopics', newSelectedTopics)
  }

  const handleAddMedia = (data) => {
    setForm('media', JSON.stringify([data]))
  }

  return (
    <>
      <div class={styles.container}>
        <Title>{t('Write an article')}</Title>
        <form>
          <div class="wide-container">
            <button
              class={clsx(styles.scrollTopButton, {
                [styles.visible]: isScrolled()
              })}
              onClick={handleScrollTopButtonClick}
            >
              <Icon name="up-button" class={styles.icon} />
              <span class={styles.scrollTopButtonLabel}>{t('Scroll up')}</span>
            </button>

            <div class="row">
              <div class="col-md-19 col-lg-18 col-xl-16 offset-md-5">
                <div
                  class={clsx(styles.edit, {
                    [styles.visible]: page().route === 'edit'
                  })}
                >
                  <div class={styles.inputContainer}>
                    <GrowingTextarea
                      value={(value) => handleTitleInputChange(value)}
                      class={styles.titleInput}
                      placeholder={t('Header')}
                      initialValue={form.title}
                      maxLength={100}
                    />
                    <Show when={formErrors.title}>
                      <div class={styles.validationError}>{formErrors.title}</div>
                    </Show>
                  </div>
                  <GrowingTextarea
                    value={(value) => setForm('subtitle', value)}
                    class={styles.subtitleInput}
                    placeholder={t('Subheader')}
                    initialValue={form.subtitle}
                    maxLength={100}
                  />

                  <Show when={props.shout.layout === 'video'}>
                    <Show
                      when={media()}
                      fallback={
                        <VideoUploader
                          data={(data) => {
                            handleAddMedia(data)
                          }}
                        />
                      }
                    >
                      <For each={JSON.parse(media())}>
                        {(mediaItem) => (
                          <>
                            <VideoPlayer
                              videoUrl={mediaItem?.url}
                              title={mediaItem?.title}
                              description={mediaItem?.body}
                              deleteAction={() => setMedia(null)}
                            />
                          </>
                        )}
                      </For>
                    </Show>
                  </Show>

                  <Editor
                    shoutId={props.shout.id}
                    initialContent={props.shout.body}
                    onChange={(body) => setForm('body', body)}
                  />
                </div>
                <div
                  class={clsx(styles.editSettings, {
                    [styles.visible]: page().route === 'editSettings'
                  })}
                >
                  <h1>{t('Publish Settings')}</h1>

                  <h4>Slug</h4>
                  <div class="pretty-form__item">
                    <input
                      type="text"
                      name="slug"
                      id="slug"
                      value={form.slug}
                      onChange={handleSlugInputChange}
                    />
                    <label for="slug">Slug</label>
                  </div>

                  {/*<h4>Лид</h4>*/}
                  {/*<div class="pretty-form__item">*/}
                  {/*  <textarea name="lead" id="lead" placeholder="Лид"></textarea>*/}
                  {/*  <label for="lead">Лид</label>*/}
                  {/*</div>*/}

                  {/*<h4>Выбор сообщества</h4>*/}
                  {/*<p class="description">Сообщества можно перечислить через запятую</p>*/}
                  {/*<div class="pretty-form__item">*/}
                  {/*  <input*/}
                  {/*    type="text"*/}
                  {/*    name="community"*/}
                  {/*    id="community"*/}
                  {/*    placeholder="Сообщества"*/}
                  {/*    class="nolabel"*/}
                  {/*  />*/}
                  {/*</div>*/}

                  <h4>Темы</h4>
                  {/*<p class="description">*/}
                  {/*  Добавьте несколько тем, чтобы читатель знал, о&nbsp;чем ваш материал, и&nbsp;мог найти*/}
                  {/*  его на&nbsp;страницах интересных ему тем. Темы можно менять местами, первая тема*/}
                  {/*  становится заглавной*/}
                  {/*</p>*/}
                  <div class={styles.inputContainer}>
                    <div class={clsx('pretty-form__item', styles.topicSelectContainer)}>
                      <Show when={topics()}>
                        <TopicSelect
                          topics={topics()}
                          onChange={handleTopicSelectChange}
                          selectedTopics={form.selectedTopics}
                          onMainTopicChange={(mainTopic) => setForm('mainTopic', mainTopic)}
                          mainTopic={form.mainTopic}
                        />
                      </Show>
                    </div>
                    <Show when={formErrors.selectedTopics}>
                      <div class={styles.validationError}>{formErrors.selectedTopics}</div>
                    </Show>
                  </div>

                  {/*<h4>Соавторы</h4>*/}
                  {/*<p class="description">У каждого соавтора можно добавить роль</p>*/}
                  {/*<div class="pretty-form__item--with-button">*/}
                  {/*  <div class="pretty-form__item">*/}
                  {/*    <input type="text" name="authors" id="authors" placeholder="Введите имя или e-mail" />*/}
                  {/*    <label for="authors">Введите имя или e-mail</label>*/}
                  {/*  </div>*/}
                  {/*  <button class="button button--submit">Добавить</button>*/}
                  {/*</div>*/}

                  {/*<div class="row">*/}
                  {/*  <div class="col-md-6">Михаил Драбкин</div>*/}
                  {/*  <div class="col-md-6">*/}
                  {/*    <input type="text" name="coauthor" id="coauthor1" class="nolabel" />*/}
                  {/*  </div>*/}
                  {/*</div>*/}

                  <h4>{t('Material card')}</h4>
                  <p class="description">
                    {t(
                      'Choose a title image for the article. You can immediately see how the publication card will look like.'
                    )}
                  </p>
                  <div class={styles.articlePreview}>
                    <div class={styles.actions}>
                      <Button
                        variant="primary"
                        onClick={() => showModal('uploadCoverImage')}
                        value={coverImage() || form.coverImageUrl ? t('Add another image') : t('Add image')}
                      />
                      <Show when={coverImage() ?? form.coverImageUrl}>
                        <Button variant="secondary" onClick={handleDeleteCoverImage} value={t('Delete')} />
                      </Show>
                    </div>
                    <Show when={coverImage() ?? form.coverImageUrl}>
                      <div class={styles.shoutCardCoverContainer}>
                        <div class={styles.shoutCardCover}>
                          <img
                            src={coverImage() || imageProxy(form.coverImageUrl)}
                            alt={form.title}
                            loading="lazy"
                          />
                        </div>
                      </div>
                    </Show>
                    <div class={styles.shoutCardTitle}>{form.title}</div>
                    <div class={styles.shoutCardSubtitle}>{form.subtitle}</div>
                    <div class={styles.shoutAuthor}>{user().name}</div>
                  </div>
                </div>
              </div>
            </div>
          </div>
        </form>
      </div>
      <Modal variant="narrow" name="uploadCoverImage">
        <UploadModalContent onClose={(value) => handleUploadModalContentCloseSetCover(value)} />
      </Modal>
      <Panel shoutId={props.shout.id} />
    </>
  )
}

export default EditView