import React from "react";
import { graphql, Link } from "gatsby";
import { connect } from "react-redux";
import { pushNewPage, pushNewQuery } from "../state/app";

import Shell from "../components/Shell";
import Meta from "../components/Meta";
import Search from "../components/Search";
import SnippetCard from "../components/SnippetCard";
import SimpleCard from "../components/SimpleCard";

// ===================================================
// Home page (splash and search)
// ===================================================
const IndexPage = props => {
  const snippets = props.data.allSnippet.edges;

  const [searchQuery, setSearchQuery] = React.useState(props.searchQuery);
  const [searchResults, setSearchResults] = React.useState(snippets);

  React.useEffect(() => {
    props.dispatch(pushNewQuery(searchQuery));
    let q = searchQuery.toLowerCase();
    let results = snippets;
    if (q.trim().length)
      results = snippets.filter(
        ({ node }) =>
          node.tags.all.filter(t => t.indexOf(q) !== -1).length ||
          node.title.toLowerCase().indexOf(q) !== -1
      );
    setSearchResults(results);
  }, [searchQuery]);

  React.useEffect(() => {
    props.dispatch(pushNewPage("Search", "/search"));
  }, []);

  return (
    <>
      <Meta
        meta={[
          {
            name: `google-site-verification`,
            content: `YX9mF-TxoHZGJ9SZ8XwvWgGR_KTcbH1uHul4iDklyr0`
          }
        ]}
      />
      <Shell withIcon={false} withTitle={false}>
        <img
          src={props.data.file.childImageSharp.original.src}
          alt="Logo"
          className="index-logo"
        />
        <h1 className="index-title">{props.data.site.siteMetadata.title}</h1>
        <p className="index-sub-title">
          {props.data.site.siteMetadata.description}
        </p>
        <Search
          setSearchQuery={setSearchQuery}
          defaultValue={props.searchQuery}
        />
        {searchQuery.length === 0 ? (
          <>
            <p className="index-light-sub">
              Start typing a keyword to see matching snippets or{" "}
              <Link to="/list">click to view the whole list</Link>.
            </p>
            <div className="index-spacer" />
          </>
        ) : searchResults.length === 0 ? (
          <>
            <p className="index-light-sub">
              We couldn't find any results for the keyword{" "}
              <strong>{searchQuery}</strong>.
            </p>
            <div className="index-spacer" />
          </>
        ) : (
          <>
            <p className="light-sub">
              Click on a snippet card to view the snippet.
            </p>
            <h2 className="page-sub-title">Search results</h2>
            {searchResults.map(({ node }) => (
              <SnippetCard
                short
                key={`snippet_${node.id}`}
                snippetData={{
                  title: node.title,
                  html: node.html.text,
                  tags: node.tags.all,
                  id: node.id
                }}
                isDarkMode={props.isDarkMode}
              />
            ))}
          </>
        )}
        <SimpleCard title="About us">
          <p style={{ textAlign: "justify" }}>
            <strong>30 seconds</strong> provides high-quality learning resources
            for developers of all skill levels in the form of snippet
            collections in various programming languages since its inception in
            2017. Today, <strong>30 seconds</strong> consists of a community of
            over 250 contributors and more than 10 maintainers, dedicated to
            creating the best short-form learning resources for software
            developers. Our goal is to make software development more accessible
            and help the open-source community grow by helping people learn to
            code for free.
            <br />
            <br />
            <Link to="/about">Read more...</Link>
          </p>
        </SimpleCard>
        <SimpleCard title="Our other projects">
          <ul>
            {[
              {
                name: "30 seconds of CSS",
                url: "https://css.30secondsofcode.org/"
              },
              {
                name: "30 seconds of Python",
                url: "https://python.30secondsofcode.org/"
              },
              {
                name: "30 seconds of React",
                url: "https://react.30secondsofcode.org/"
              },
              {
                name: "30 seconds of PHP",
                url: "https://php.30secondsofcode.org/"
              },
              {
                name: "30 seconds of Interviews",
                url: "https://30secondsofinterviews.org/"
              },
              {
                name: "30 seconds of Knowledge",
                url:
                  "https://chrome.google.com/webstore/detail/30-seconds-of-knowledge/mmgplondnjekobonklacmemikcnhklla"
              }
            ].map(v => (
              <li>
                <a
                  href={v.url}
                  key={`link_${v.name}`}
                  target="_blank"
                  rel="noopener noreferrer"
                >
                  {v.name}
                </a>
              </li>
            ))}
          </ul>
        </SimpleCard>
      </Shell>
    </>
  );
};

export default connect(
  state => ({
    isDarkMode: state.app.isDarkMode,
    lastPageTitle: state.app.lastPageTitle,
    lastPageUrl: state.app.lastPageUrl,
    searchQuery: state.app.searchQuery
  }),
  null
)(IndexPage);

export const indexPageQuery = graphql`
  query snippetList {
    site {
      siteMetadata {
        title
        description
        author
      }
    }
    file(relativePath: { eq: "30s-icon.png" }) {
      id
      childImageSharp {
        original {
          src
        }
      }
    }
    allSnippet {
      edges {
        node {
          title
          html {
            text
          }
          tags {
            all
          }
          id
        }
      }
    }
  }
`;