import { graphql } from "gatsby"
import React, { FC, Fragment } from "react"
import descend from "ramda/es/descend"
import sortWith from "ramda/es/sortWith"

import { Footer } from "../components/Footer"
import { Header } from "../components/Header"
import { Markdown } from "../components/Markdown"
import { PageContent } from "../components/PageContent"
import { PageNavigation } from "../components/PageNavigation"
import { SEO } from "../components/SEO"
import useSidebar from "../hooks/useSidebar"
import { buildToc } from "../utils"

// @todo maybe find alternative type for data
const ResourcePage: FC<any> = ({ data }) => {
  const { current: language } = useSidebar()
  const { relativePath } = data.file
  const {
    body,
    headings,
    excerpt,
    fields,
    frontmatter,
    timeToRead,
  } = data.file.post

  const toc = buildToc(headings)

  const shiftLayout = Boolean(
    frontmatter.recommended_reading ||
      frontmatter.external_resources ||
      toc.length
  )

  const pages = sortWith(
    [
      descend((f: any) => {
        if (f.node.relativePath.includes("intro")) {
          return 1
        }

        return -1
      }),
    ],
    data.allFile.edges
  )
  const currentIndex = pages.findIndex(
    (x: any) => x.node.relativePath === relativePath
  )

  const nextPage = pages[currentIndex + 1] && {
    title: pages[currentIndex + 1].node.title.frontmatter.title,
    relativePath: pages[currentIndex + 1].node.relativePath,
  }

  const previousPage = pages[currentIndex - 1] && {
    title: pages[currentIndex - 1].node.title.frontmatter.title,
    relativePath: pages[currentIndex - 1].node.relativePath,
  }

  return (
    <Fragment>
      <SEO
        title={frontmatter.title}
        subCategory={language}
        description={excerpt}
      />
      <Header
        relativePath={relativePath}
        basePath="/resources"
        title={frontmatter.title}
        authors={fields.authors}
        createdAt={frontmatter.created_at}
        timeToRead={timeToRead}
        shifted={shiftLayout}
      />
      <PageContent
        content={
          <>
            <Markdown content={body} />
            <PageNavigation next={nextPage} previous={previousPage} />
            <Footer />
          </>
        }
        toc={toc}
        recommendedReading={frontmatter.recommended_reading}
        externalResources={frontmatter.external_resources}
      />
    </Fragment>
  )
}

export default ResourcePage

export const query = graphql`
  query ResourcePage($file: String!, $directory: String!) {
    file(relativePath: { eq: $file }) {
      relativePath
      post: childMdx {
        body
        headings {
          depth
          value
        }
        excerpt
        fields {
          authors {
            name
            hash
            avatar
          }
        }
        frontmatter {
          created_at
          title
          recommended_reading
          external_resources {
            text
            href
          }
        }
        timeToRead
      }
    }
    allFile(
      filter: { relativeDirectory: { eq: $directory } }
      sort: { fields: relativePath, order: ASC }
    ) {
      edges {
        node {
          relativePath
          title: childMdx {
            frontmatter {
              title
            }
          }
        }
      }
    }
  }
`