/* eslint-disable max-statements */
import type { MDXComponents } from 'mdx/types';
import type { GetStaticPaths, GetStaticProps } from 'next';
import dynamic from 'next/dynamic';
import Head from 'next/head';
import NextImage from 'next/image';
import { useRouter } from 'next/router';
import Script from 'next/script';
import type { ComponentType } from 'react';
import { useIntl } from 'react-intl';
import {
  getLayout,
  SharingWidget,
  Spinner,
  Heading,
  ProjectOverview,
  type ProjectMeta,
  type Repository,
  Page,
  PageHeader,
  PageSidebar,
  TocWidget,
  PageBody,
} from '../../components';
import { mdxComponents } from '../../components/mdx';
import styles from '../../styles/pages/project.module.scss';
import type { NextPageWithLayout, ProjectPreview, Repos } from '../../types';
import { CONFIG } from '../../utils/config';
import { ROUTES } from '../../utils/constants';
import {
  getSchemaJson,
  getSinglePageSchema,
  getWebPageSchema,
} from '../../utils/helpers';
import {
  getProjectData,
  getProjectFilenames,
  loadTranslation,
  type Messages,
} from '../../utils/helpers/server';
import {
  useBreadcrumb,
  useGithubApi,
  useHeadingsTree,
} from '../../utils/hooks';

type ProjectPageProps = {
  project: ProjectPreview;
  translation: Messages;
};

/**
 * Project page.
 */
const ProjectPage: NextPageWithLayout<ProjectPageProps> = ({ project }) => {
  const { id, intro, meta, title } = project;
  const { cover, dates, license, repos, seo, technologies } = meta;
  const intl = useIntl();
  const { items: breadcrumbItems, schema: breadcrumbSchema } = useBreadcrumb({
    title,
    url: `${ROUTES.PROJECTS}/${id}`,
  });
  const { ref, tree } = useHeadingsTree({ fromLevel: 2 });

  const ProjectContent: ComponentType<MDXComponents> = dynamic(
    async () => import(`../../content/projects/${id}.mdx`),
    {
      loading: () => <Spinner />,
    }
  );

  const { asPath } = useRouter();
  const page = {
    title: `${seo.title} - ${CONFIG.name}`,
    url: `${CONFIG.url}${asPath}`,
  };

  /**
   * Retrieve the project repositories.
   *
   * @param {Repos} repositories - A repositories object.
   * @returns {Repository[]} - An array of repositories.
   */
  const getRepos = (repositories: Repos): Repository[] => {
    const definedRepos: Repository[] = [];

    if (repositories.github)
      definedRepos.push({
        id: 'Github',
        label: intl.formatMessage({
          defaultMessage: 'Github profile',
          description: 'ProjectsPage: Github profile link',
          id: 'Nx8Jo5',
        }),
        url: repositories.github,
      });

    if (repositories.gitlab)
      definedRepos.push({
        id: 'Gitlab',
        label: intl.formatMessage({
          defaultMessage: 'Gitlab profile',
          description: 'ProjectsPage: Gitlab profile link',
          id: 'sECHDg',
        }),
        url: repositories.gitlab,
      });

    return definedRepos;
  };

  const loadingRepoPopularity = intl.formatMessage({
    defaultMessage: 'Loading the repository popularity...',
    description: 'ProjectsPage: loading repository popularity',
    id: 'RwI3B9',
  });

  const { isError, isLoading, data } = useGithubApi(
    /*
     * Repo should be defined for each project so for now it is safe for my
     * use-case. However, I should refactored it to handle cases where it is
     * not defined. The logic should be extracted in another component I think.
     *
     * TODO: fix this hardly readable argument
     */
    meta.repos ? meta.repos.github ?? '' : ''
  );

  if (isError) return 'Error';
  if (isLoading || !data) return <Spinner aria-label={loadingRepoPopularity} />;

  const overviewMeta: Partial<ProjectMeta> = {
    creationDate: data.created_at,
    lastUpdateDate: data.updated_at,
    license,
    popularity: repos?.github
      ? {
          count: data.stargazers_count,
          url: `https://github.com/${repos.github}/stargazers`,
        }
      : undefined,
    repositories: repos ? getRepos(repos) : undefined,
    technologies,
  };

  const webpageSchema = getWebPageSchema({
    description: seo.description,
    locale: CONFIG.locales.defaultLocale,
    slug: asPath,
    title: seo.title,
    updateDate: dates.update,
  });
  const articleSchema = getSinglePageSchema({
    cover: `/projects/${id}.jpg`,
    dates,
    description: intro,
    id: 'project',
    kind: 'page',
    locale: CONFIG.locales.defaultLocale,
    slug: asPath,
    title,
  });
  const schemaJsonLd = getSchemaJson([webpageSchema, articleSchema]);
  const sharingWidgetTitle = intl.formatMessage({
    defaultMessage: 'Share',
    id: 'HKKkQk',
    description: 'SharingWidget: widget title',
  });
  const tocTitle = intl.formatMessage({
    defaultMessage: 'Table of Contents',
    description: 'PageLayout: table of contents title',
    id: 'eys2uX',
  });

  return (
    <Page breadcrumbs={breadcrumbItems} isBodyLastChild>
      <Head>
        <title>{page.title}</title>
        {/*eslint-disable-next-line react/jsx-no-literals -- Name allowed */}
        <meta name="description" content={seo.description} />
        <meta property="og:url" content={page.url} />
        {/*eslint-disable-next-line react/jsx-no-literals -- Content allowed */}
        <meta property="og:type" content="article" />
        <meta property="og:title" content={title} />
        <meta property="og:description" content={intro} />
      </Head>
      <Script
        // eslint-disable-next-line react/jsx-no-literals -- Id allowed
        id="schema-project"
        type="application/ld+json"
        // eslint-disable-next-line react/no-danger -- Necessary for schema
        dangerouslySetInnerHTML={{ __html: JSON.stringify(schemaJsonLd) }}
      />
      <Script
        dangerouslySetInnerHTML={{ __html: JSON.stringify(breadcrumbSchema) }}
        // eslint-disable-next-line react/jsx-no-literals -- Id allowed
        id="schema-breadcrumb"
        type="application/ld+json"
      />
      <PageHeader
        heading={title}
        intro={intro}
        meta={{
          publicationDate: dates.publication,
          updateDate: dates.update,
        }}
      />
      <PageSidebar>
        <TocWidget
          heading={<Heading level={3}>{tocTitle}</Heading>}
          tree={tree}
        />
      </PageSidebar>
      <PageBody ref={ref}>
        <ProjectOverview
          cover={cover ? <NextImage {...cover} /> : undefined}
          meta={overviewMeta}
          name={project.title}
        />
        <ProjectContent components={mdxComponents} />
      </PageBody>
      <PageSidebar>
        <SharingWidget
          data={{ excerpt: intro, title, url: page.url }}
          heading={<Heading level={3}>{sharingWidgetTitle}</Heading>}
          media={[
            'diaspora',
            'email',
            'facebook',
            'journal-du-hacker',
            'linkedin',
            'twitter',
          ]}
          className={styles.widget}
        />
      </PageSidebar>
    </Page>
  );
};

ProjectPage.getLayout = (page) => getLayout(page);

export const getStaticProps: GetStaticProps<ProjectPageProps> = async ({
  locale,
  params,
}) => {
  const translation = await loadTranslation(locale);
  const project = await getProjectData(params ? (params.slug as string) : '');

  return {
    props: {
      project,
      translation,
    },
  };
};

export const getStaticPaths: GetStaticPaths = () => {
  const filenames = getProjectFilenames();
  const paths = filenames.map((filename) => {
    return {
      params: {
        slug: filename,
      },
    };
  });

  return {
    paths,
    fallback: false,
  };
};

export default ProjectPage;