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import {empty, openAggregate} from '../../util/sugar.js';

export default {
  contentDependencies: [
    'generateColorStyleRules',
    'generateFooterLocalizationLinks',
    'generateStickyHeadingContainer',
    'transformContent',
  ],

  extraDependencies: [
    'cachebust',
    'html',
    'language',
    'to',
    'transformMultiline',
    'wikiData',
  ],

  sprawl({wikiInfo}) {
    return {
      footerContent: wikiInfo.footerContent,
      wikiColor: wikiInfo.color,
      wikiName: wikiInfo.nameShort,
    };
  },

  data({wikiName}) {
    return {
      wikiName,
    };
  },

  relations(relation, sprawl) {
    const relations = {};

    relations.footerLocalizationLinks =
      relation('generateFooterLocalizationLinks');

    relations.stickyHeadingContainer =
      relation('generateStickyHeadingContainer');

    relations.defaultFooterContent =
      relation('transformContent', sprawl.footerContent);

    relations.defaultColorStyleRules =
      relation('generateColorStyleRules', sprawl.wikiColor);

    return relations;
  },

  generate(data, relations, {
    cachebust,
    html,
    language,
    to,
  }) {
    const sidebarSlots = side => ({
      // Content is a flat HTML array. It'll generate one sidebar section
      // if specified.
      [side + 'Content']: {type: 'html'},

      // Multiple is an array of {content: (HTML)} objects. Each of these
      // will generate one sidebar section.
      [side + 'Multiple']: {
        validate: v =>
          v.arrayOf(
            v.validateProperties({
              content: v.isHTML,
            })),
      },

      // Sticky mode controls which sidebar section(s), if any, follow the
      // scroll position, "sticking" to the top of the browser viewport.
      //
      // 'last' - last or only sidebar box is sticky
      // 'column' - entire column, incl. multiple boxes from top, is sticky
      // 'none' - sidebar not sticky at all, stays at top of page
      //
      // Note: This doesn't affect the content of any sidebar section, only
      // the whole section's containing box (or the sidebar column as a whole).
      [side + 'StickyMode']: {
        validate: v => v.is('last', 'column', 'static'),
      },

      // Collapsing sidebars disappear when the viewport is sufficiently
      // thin. (This is the default.) Override as false to make the sidebar
      // stay visible in thinner viewports, where the page layout will be
      // reflowed so the sidebar is as wide as the screen and appears below
      // nav, above the main content.
      [side + 'Collapse']: {type: 'boolean', default: true},

      // Wide sidebars generally take up more horizontal space in the normal
      // page layout, and should be used if the content of the sidebar has
      // a greater than typical focus compared to main content.
      [side + 'Wide']: {type: 'boolean', defualt: false},
    });

    return html.template({
      annotation: 'generatePageLayout',

      slots: {
        title: {type: 'html'},
        showWikiNameInTitle: {type: 'boolean', default: true},

        cover: {type: 'html'},

        socialEmbed: {type: 'html'},

        colorStyleRules: {
          validate: v => v.arrayOf(v.isString),
          default: [],
        },

        additionalStyleRules: {
          validate: v => v.arrayOf(v.isString),
          default: [],
        },

        mainClasses: {
          validate: v => v.arrayOf(v.isString),
          default: [],
        },

        // Main

        mainContent: {type: 'html'},

        headingMode: {
          validate: v => v.is('sticky', 'static'),
          default: 'static',
        },

        // Sidebars

        ...sidebarSlots('leftSidebar'),
        ...sidebarSlots('rightSidebar'),

        // Nav & Footer

        navContent: {type: 'html'},
        navBottomRowContent: {type: 'html'},

        navLinkStyle: {
          validate: v => v.is('hierarchical', 'index'),
          default: 'index',
        },

        navLinks: {
          validate: v =>
            v.arrayOf(object => {
              v.isObject(object);

              const aggregate = openAggregate({message: `Errors validating navigation link`});

              aggregate.call(v.validateProperties({
                auto: () => true,
                html: () => true,

                path: () => true,
                title: () => true,
                accent: () => true,
              }), object);

              if (object.auto || object.html) {
                if (object.auto && object.html) {
                  aggregate.push(new TypeError(`Don't specify both auto and html`));
                } else if (object.auto) {
                  aggregate.call(v.is('home', 'current'), object.auto);
                } else {
                  aggregate.call(v.isHTML, object.html);
                }

                if (object.path || object.title) {
                  aggregate.push(new TypeError(`Don't specify path or title along with auto or html`));
                }
              } else {
                aggregate.call(v.validateProperties({
                  path: v.arrayOf(v.isString),
                  title: v.isString,
                }), {
                  path: object.path,
                  title: object.title,
                });
              }

              aggregate.close();

              return true;
            })
        },

        footerContent: {type: 'html'},
      },

      content(slots) {
        let titleHTML = null;

        if (!html.isBlank(slots.title)) {
          switch (slots.headingMode) {
            case 'sticky':
              titleHTML =
                relations.stickyHeadingContainer.slots({
                  title: slots.title,
                  cover: slots.cover,
                });
              break;
            case 'static':
              titleHTML = html.tag('h1', slots.title);
              break;
          }
        }

        let footerContent = slots.footerContent;

        if (html.isBlank(footerContent)) {
          footerContent = relations.defaultFooterContent
            .slot('mode', 'multiline');
        }

        const mainHTML =
          html.tag('main', {
            id: 'content',
            class: slots.mainClasses,
          }, [
            titleHTML,

            slots.cover,

            html.tag('div',
              {
                [html.onlyIfContent]: true,
                class: 'main-content-container',
              },
              slots.mainContent),
          ]);

        const footerHTML =
          html.tag('footer',
            {[html.onlyIfContent]: true, id: 'footer'},
            [
              html.tag('div',
                {
                  [html.onlyIfContent]: true,
                  class: 'footer-content',
                },
                footerContent),

              relations.footerLocalizationLinks,
            ]);

        const navHTML = html.tag('nav',
          {
            [html.onlyIfContent]: true,
            id: 'header',
            class: [
              !empty(slots.navLinks) && 'nav-has-main-links',
              !html.isBlank(slots.navContent) && 'nav-has-content',
              !html.isBlank(slots.navBottomRowContent) && 'nav-has-bottom-row',
            ],
          },
          [
            html.tag('div',
              {
                [html.onlyIfContent]: true,
                class: [
                  'nav-main-links',
                  'nav-links-' + slots.navLinkStyle,
                ],
              },
              slots.navLinks?.map((cur, i) => {
                let content;

                if (cur.html) {
                  content = cur.html;
                } else {
                  let title;
                  let href;

                  switch (cur.auto) {
                    case 'home':
                      title = data.wikiName;
                      href = to('localized.home');
                      break;
                    case 'current':
                      title = slots.title;
                      href = '';
                      break;
                    case null:
                    case undefined:
                      title = cur.title;
                      href = to(...cur.path);
                      break;
                  }

                  content = html.tag('a',
                    {href},
                    title);
                }

                let className;

                if (cur.auto === 'current') {
                  className = 'current';
                } else if (
                  slots.navLinkStyle === 'hierarchical' &&
                  i === slots.navLinks.length - 1
                ) {
                  className = 'current';
                }

                return html.tag('span',
                  {class: className},
                  [
                    html.tag('span',
                      {class: 'nav-link-content'},
                      content),
                    html.tag('span',
                      {[html.onlyIfContent]: true, class: 'nav-link-accent'},
                      cur.accent),
                  ]);
              })),

            html.tag('div',
              {[html.onlyIfContent]: true, class: 'nav-bottom-row'},
              slots.navBottomRowContent),

            html.tag('div',
              {[html.onlyIfContent]: true, class: 'nav-content'},
              slots.navContent),
          ])

        const generateSidebarHTML = (side, id) => {
          const content = slots[side + 'Content'];
          const multiple = slots[side + 'Multiple'];
          const stickyMode = slots[side + 'StickyMode'];
          const wide = slots[side + 'Wide'];
          const collapse = slots[side + 'Collapse'];

          let sidebarClasses = [];
          let sidebarContent = html.blank();

          if (!html.isBlank(content)) {
            sidebarClasses = ['sidebar'];
            sidebarContent = content;
          } else if (multiple) {
            sidebarClasses = ['sidebar-multiple'];
            sidebarContent =
              multiple
                .filter(Boolean)
                .map(({content}) =>
                  html.tag('div',
                    {
                      [html.onlyIfContent]: true,
                      class: 'sidebar',
                    },
                    content));
          }

          return html.tag('div',
            {
              [html.onlyIfContent]: true,
              id,
              class: [
                'sidebar-column',
                wide && 'wide',
                !collapse && 'no-hide',
                stickyMode !== 'static' && `sticky-${stickyMode}`,
                ...sidebarClasses,
              ],
            },
            sidebarContent);
        }

        const sidebarLeftHTML = generateSidebarHTML('leftSidebar', 'sidebar-left');
        const sidebarRightHTML = generateSidebarHTML('rightSidebar', 'sidebar-right');
        const collapseSidebars = slots.leftSidebarCollapse && slots.rightSidebarCollapse;

        const layoutHTML = [
          navHTML,
          // banner.position === 'top' && bannerHTML,
          // secondaryNavHTML,
          html.tag('div',
            {
              class: [
                'layout-columns',
                !collapseSidebars && 'vertical-when-thin',
                (sidebarLeftHTML || sidebarRightHTML) && 'has-one-sidebar',
                (sidebarLeftHTML && sidebarRightHTML) && 'has-two-sidebars',
                !(sidebarLeftHTML || sidebarRightHTML) && 'has-zero-sidebars',
                sidebarLeftHTML && 'has-sidebar-left',
                sidebarRightHTML && 'has-sidebar-right',
              ],
            },
            [
              sidebarLeftHTML,
              mainHTML,
              sidebarRightHTML,
            ]),
          // banner.position === 'bottom' && bannerHTML,
          footerHTML,
        ].filter(Boolean).join('\n');

        const documentHTML = html.tags([
          `<!DOCTYPE html>`,
          html.tag('html',
            {
              lang: language.intlCode,
              'data-language-code': language.code,

              /*
              'data-url-key': 'localized.' + pagePath[0],
              ...Object.fromEntries(
                pagePath.slice(1).map((v, i) => [['data-url-value' + i], v])),
              */

              'data-rebase-localized': to('localized.root'),
              'data-rebase-shared': to('shared.root'),
              'data-rebase-media': to('media.root'),
              'data-rebase-data': to('data.root'),
            },
            [
              // developersComment,

              html.tag('head', [
                html.tag('title',
                  (slots.showWikiNameInTitle
                    ? language.formatString('misc.pageTitle.withWikiName', {
                        title: slots.title,
                        wikiName: data.wikiName,
                      })
                    : language.formatString('misc.pageTitle', {
                        title: slots.title,
                      }))),

                html.tag('meta', {charset: 'utf-8'}),
                html.tag('meta', {
                  name: 'viewport',
                  content: 'width=device-width, initial-scale=1',
                }),

                /*
                ...(
                  Object.entries(meta)
                    .filter(([key, value]) => value)
                    .map(([key, value]) => html.tag('meta', {[key]: value}))),

                canonical &&
                  html.tag('link', {
                    rel: 'canonical',
                    href: canonical,
                  }),

                ...(
                  localizedCanonical
                    .map(({lang, href}) => html.tag('link', {
                      rel: 'alternate',
                      hreflang: lang,
                      href,
                    }))),

                */

                // slots.socialEmbed,

                html.tag('link', {
                  rel: 'stylesheet',
                  href: to('shared.staticFile', `site4.css?${cachebust}`),
                }),

                html.tag('style', [
                  (empty(slots.colorStyleRules)
                    ? relations.defaultColorStyleRules
                    : slots.colorStyleRules),
                  slots.additionalStyleRules,
                ]),

                html.tag('script', {
                  src: to('shared.staticFile', `lazy-loading.js?${cachebust}`),
                }),
              ]),

              html.tag('body',
                // {style: body.style || ''},
                [
                  html.tag('div', {id: 'page-container'}, [
                    // mainHTML && skippersHTML,
                    layoutHTML,
                  ]),

                  // infoCardHTML,
                  // imageOverlayHTML,

                  html.tag('script', {
                    type: 'module',
                    src: to('shared.staticFile', `client.js?${cachebust}`),
                  }),
                ]),
            ])
        ]);

        return documentHTML;
      },
    });
  },
};