import { Page } from 'web/components/page'

import { postPath, getPostBySlug, updatePost } from 'web/lib/firebase/posts'
import { Post } from 'common/post'
import { Title } from 'web/components/title'
import { Spacer } from 'web/components/layout/spacer'
import { Content, TextEditor, useTextEditor } from 'web/components/editor'
import { getUser, User } from 'web/lib/firebase/users'
import { PencilIcon, ShareIcon } from '@heroicons/react/solid'
import clsx from 'clsx'
import { Button } from 'web/components/button'
import { useState } from 'react'
import { SharePostModal } from 'web/components/share-post-modal'
import { Row } from 'web/components/layout/row'
import { Col } from 'web/components/layout/col'
import { ENV_CONFIG } from 'common/envs/constants'
import Custom404 from 'web/pages/404'
import { UserLink } from 'web/components/user-link'
import { listAllCommentsOnPost } from 'web/lib/firebase/comments'
import { PostComment } from 'common/comment'
import { CommentTipMap, useTipTxns } from 'web/hooks/use-tip-txns'
import { groupBy, sortBy } from 'lodash'
import { PostCommentInput, PostCommentThread } from 'web/posts/post-comments'
import { useCommentsOnPost } from 'web/hooks/use-comments'
import { useUser } from 'web/hooks/use-user'
import { usePost } from 'web/hooks/use-post'
import { SEO } from 'web/components/SEO'

export async function getStaticProps(props: { params: { slugs: string[] } }) {
  const { slugs } = props.params

  const post = await getPostBySlug(slugs[0])
  const creator = post ? await getUser(post.creatorId) : null
  const comments = post && (await listAllCommentsOnPost(post.id))

  return {
    props: {
      post,
      creator,
      comments,
    },

    revalidate: 60, // regenerate after a minute
  }
}

export async function getStaticPaths() {
  return { paths: [], fallback: 'blocking' }
}

export default function PostPage(props: {
  post: Post
  creator: User
  comments: PostComment[]
}) {
  const [isShareOpen, setShareOpen] = useState(false)
  const { creator } = props
  const post = usePost(props.post.id) ?? props.post

  const tips = useTipTxns({ postId: post.id })
  const shareUrl = `https://${ENV_CONFIG.domain}${postPath(post.slug)}`
  const updatedComments = useCommentsOnPost(post.id)
  const comments = updatedComments ?? props.comments
  const user = useUser()

  if (post == null) {
    return <Custom404 />
  }

  return (
    <Page>
      <SEO
        title={post.title}
        description={'A post by ' + creator.username}
        url={'/post/' + post.slug}
      />
      <div className="mx-auto w-full max-w-3xl ">
        <Title className="!mt-0 py-4 px-2" text={post.title} />
        <Row>
          <Col className="flex-1 px-2">
            <div className={'inline-flex'}>
              <div className="mr-1 text-gray-500">Created by</div>
              <UserLink
                className="text-neutral"
                name={creator.name}
                username={creator.username}
              />
            </div>
          </Col>
          <Col className="px-2">
            <Button
              size="lg"
              color="gray-white"
              className={'flex'}
              onClick={() => {
                setShareOpen(true)
              }}
            >
              <ShareIcon
                className={clsx('mr-2 h-[24px] w-5')}
                aria-hidden="true"
              />
              Share
              <SharePostModal
                isOpen={isShareOpen}
                setOpen={setShareOpen}
                shareUrl={shareUrl}
              />
            </Button>
          </Col>
        </Row>

        <Spacer h={2} />
        <div className="rounded-lg bg-white px-6 py-4 sm:py-0">
          <div className="form-control w-full py-2">
            {user && user.id === post.creatorId ? (
              <RichEditPost post={post} />
            ) : (
              <Content content={post.content} />
            )}
          </div>
        </div>

        <Spacer h={4} />
        <div className="rounded-lg bg-white px-6 py-4 sm:py-0">
          <PostCommentsActivity post={post} comments={comments} tips={tips} />
        </div>
      </div>
    </Page>
  )
}

export function PostCommentsActivity(props: {
  post: Post
  comments: PostComment[]
  tips: CommentTipMap
}) {
  const { post, comments, tips } = props
  const commentsByUserId = groupBy(comments, (c) => c.userId)
  const commentsByParentId = groupBy(comments, (c) => c.replyToCommentId ?? '_')
  const topLevelComments = sortBy(
    commentsByParentId['_'] ?? [],
    (c) => -c.createdTime
  )

  return (
    <Col className="p-2">
      <PostCommentInput post={post} />
      {topLevelComments.map((parent) => (
        <PostCommentThread
          key={parent.id}
          post={post}
          parentComment={parent}
          threadComments={sortBy(
            commentsByParentId[parent.id] ?? [],
            (c) => c.createdTime
          )}
          tips={tips}
          commentsByUserId={commentsByUserId}
        />
      ))}
    </Col>
  )
}

export function RichEditPost(props: { post: Post }) {
  const { post } = props
  const [editing, setEditing] = useState(false)
  const [isSubmitting, setIsSubmitting] = useState(false)

  const { editor, upload } = useTextEditor({
    defaultValue: post.content,
    disabled: isSubmitting,
  })

  async function savePost() {
    if (!editor) return

    await updatePost(post, {
      content: editor.getJSON(),
    })
  }

  return editing ? (
    <>
      <TextEditor editor={editor} upload={upload} />
      <Spacer h={2} />
      <Row className="gap-2">
        <Button
          onClick={async () => {
            setIsSubmitting(true)
            await savePost()
            setEditing(false)
            setIsSubmitting(false)
          }}
        >
          Save
        </Button>
        <Button color="gray" onClick={() => setEditing(false)}>
          Cancel
        </Button>
      </Row>
    </>
  ) : (
    <>
      <div className="relative">
        <div className="absolute top-0 right-0 z-10 space-x-2">
          <Button
            color="gray"
            size="xs"
            onClick={() => {
              setEditing(true)
              editor?.commands.focus('end')
            }}
          >
            <PencilIcon className="inline h-4 w-4" />
            Edit
          </Button>
        </div>

        <Content content={post.content} />
        <Spacer h={2} />
      </div>
    </>
  )
}