webapp/src/components/Views/AllTopics.tsx

import { createEffect, createMemo, For, Show } from 'solid-js'
import type { Topic } from '../../graphql/types.gen'
import { Icon } from '../Nav/Icon'
import { t } from '../../utils/intl'
import { setTopicsSort, useTopicsStore } from '../../stores/zine/topics'
import { handleClientRouteLinkClick, useRouter } from '../../stores/router'
import { TopicCard } from '../Topic/Card'
import { useAuthStore } from '../../stores/auth'
import styles from '../../styles/AllTopics.module.scss'
import cardStyles from '../Topic/Card.module.scss'
import { clsx } from 'clsx'

type AllTopicsPageSearchParams = {
  by: 'shouts' | 'authors' | 'title' | ''
}

type AllTopicsViewProps = {
  topics: Topic[]
}

export const AllTopicsView = (props: AllTopicsViewProps) => {
  const { searchParams, changeSearchParam } = useRouter<AllTopicsPageSearchParams>()

  const { sortedTopics } = useTopicsStore({
    topics: props.topics,
    sortBy: searchParams().by || 'shouts'
  })

  const { session } = useAuthStore()

  createEffect(() => {
    setTopicsSort(searchParams().by || 'shouts')
  })

  const byLetter = createMemo<{ [letter: string]: Topic[] }>(() => {
    return sortedTopics().reduce((acc, topic) => {
      const letter = topic.title[0].toUpperCase()
      if (!acc[letter]) {
        acc[letter] = []
      }

      acc[letter].push(topic)

      return acc
    }, {} as { [letter: string]: Topic[] })
  })

  const sortedKeys = createMemo<string[]>(() => {
    const keys = Object.keys(byLetter())
    keys.sort()
    return keys
  })

  const subscribed = (s) => Boolean(session()?.news?.topics && session()?.news?.topics?.includes(s || ''))

  return (
    <div class={styles.allTopicsPage}>
      <Show when={sortedTopics().length > 0}>
        <div class="wide-container">
          <div class="shift-content">
            <div class="row">
              <div class={clsx(styles.pageHeader, 'col-lg-9')}>
                <h1>{t('Topics')}</h1>
                <div class="col-lg-10">
                  <p>{t('Subscribe what you like to tune your personal feed')}</p>
                </div>
              </div>
            </div>

            <div class="row">
              <div class="col">
                <div class="row">
                  <ul class={clsx(styles.viewSwitcher, 'view-switcher col-lg-10')}>
                    <li classList={{ selected: searchParams().by === 'shouts' || !searchParams().by }}>
                      <a href="/topics?by=shouts" onClick={handleClientRouteLinkClick}>
                        {t('By shouts')}
                      </a>
                    </li>
                    <li classList={{ selected: searchParams().by === 'authors' }}>
                      <a href="/topics?by=authors" onClick={handleClientRouteLinkClick}>
                        {t('By authors')}
                      </a>
                    </li>
                    <li classList={{ selected: searchParams().by === 'title' }}>
                      <a
                        href="/topics?by=title"
                        onClick={(ev) => {
                          // just an example
                          ev.preventDefault()
                          changeSearchParam('by', 'title')
                        }}
                      >
                        {t('By alphabet')}
                      </a>
                    </li>
                    <li class="view-switcher__search">
                      <a href="/topic/search">
                        <Icon name="search" />
                        {t('Search topic')}
                      </a>
                    </li>
                  </ul>
                </div>

                <Show
                  when={searchParams().by === 'title'}
                  fallback={() => (
                    <div class={cardStyles.stats}>
                      <For each={sortedTopics()}>
                        {(topic) => (
                          <TopicCard topic={topic} compact={false} subscribed={subscribed(topic.slug)} />
                        )}
                      </For>
                    </div>
                  )}
                >
                  <For each={sortedKeys()}>
                    {(letter) => (
                      <div class={clsx(styles.group, 'group')}>
                        <h2>{letter}</h2>
                        <div class="container">
                          <div class="row">
                            <For each={byLetter()[letter]}>
                              {(topic) => (
                                <div class={clsx(styles.topic, 'topic col-sm-6 col-md-3')}>
                                  <div class="topic-title">
                                    <a href={`/topic/${topic.slug}`}>{topic.title}</a>
                                  </div>
                                </div>
                              )}
                            </For>
                          </div>
                        </div>
                      </div>
                    )}
                  </For>
                </Show>
              </div>
            </div>
          </div>
        </div>
      </Show>
    </div>
  )
}