// RenderSectionLists renders a page for each section
func (s *Site) RenderSectionLists() error {
	for section, data := range s.Sections {
		// section keys can be lower case (depending on site.pathifyTaxonomyKeys)
		// extract the original casing from the first page to get sensible titles.
		sectionName := section
		if !s.Info.preserveTaxonomyNames && len(data) > 0 {
			sectionName = data[0].Page.Section()
		}
		layouts := s.appendThemeTemplates(
			[]string{"section/" + section + ".html", "_default/section.html", "_default/list.html", "indexes/" + section + ".html", "_default/indexes.html"})

		if s.Info.preserveTaxonomyNames {
			section = helpers.MakePathSanitized(section)
		}

		n := s.newSectionListNode(sectionName, section, data)
		if err := s.renderAndWritePage(fmt.Sprintf("section %s", section), section, n, s.appendThemeTemplates(layouts)...); err != nil {
			return err
		}

		if n.paginator != nil {

			paginatePath := viper.GetString("paginatePath")

			// write alias for page 1
			s.WriteDestAlias(helpers.PaginateAliasPath(section, 1), s.permalink(section))

			pagers := n.paginator.Pagers()

			for i, pager := range pagers {
				if i == 0 {
					// already created
					continue
				}

				sectionPagerNode := s.newSectionListNode(sectionName, section, data)
				sectionPagerNode.paginator = pager
				if pager.TotalPages() > 0 {
					first, _ := pager.page(0)
					sectionPagerNode.Date = first.Date
					sectionPagerNode.Lastmod = first.Lastmod
				}
				pageNumber := i + 1
				htmlBase := fmt.Sprintf("/%s/%s/%d", section, paginatePath, pageNumber)
				if err := s.renderAndWritePage(fmt.Sprintf("section %s", section), filepath.FromSlash(htmlBase), sectionPagerNode, layouts...); err != nil {
					return err
				}
			}
		}

		if !viper.GetBool("DisableRSS") && section != "" {
			// XML Feed
			rssuri := viper.GetString("RSSUri")
			n.URL = s.permalinkStr(section + "/" + rssuri)
			n.Permalink = s.permalink(section)
			rssLayouts := []string{"section/" + section + ".rss.xml", "_default/rss.xml", "rss.xml", "_internal/_default/rss.xml"}
			if err := s.renderAndWriteXML("section "+section+" rss", section+"/"+rssuri, n, s.appendThemeTemplates(rssLayouts)...); err != nil {
				return err
			}
		}
	}
	return nil
}

func (s *Site) RenderHomePage() error {
	n := s.newHomeNode()
	layouts := s.appendThemeTemplates([]string{"index.html", "_default/list.html"})

	if err := s.renderAndWritePage("homepage", helpers.FilePathSeparator, n, layouts...); err != nil {
		return err
	}

	if n.paginator != nil {

		paginatePath := viper.GetString("paginatePath")

		// write alias for page 1
		s.WriteDestAlias(helpers.PaginateAliasPath("", 1), s.permalink("/"))

		pagers := n.paginator.Pagers()

		for i, pager := range pagers {
			if i == 0 {
				// already created
				continue
			}

			homePagerNode := s.newHomeNode()
			homePagerNode.paginator = pager
			if pager.TotalPages() > 0 {
				first, _ := pager.page(0)
				homePagerNode.Date = first.Date
				homePagerNode.Lastmod = first.Lastmod
			}
			pageNumber := i + 1
			htmlBase := fmt.Sprintf("/%s/%d", paginatePath, pageNumber)
			if err := s.renderAndWritePage(fmt.Sprintf("homepage"), filepath.FromSlash(htmlBase), homePagerNode, layouts...); err != nil {
				return err
			}
		}
	}

	if !viper.GetBool("DisableRSS") {
		// XML Feed
		n.URL = s.permalinkStr(viper.GetString("RSSUri"))
		n.Title = ""
		high := 50
		if len(s.Pages) < high {
			high = len(s.Pages)
		}
		n.Data["Pages"] = s.Pages[:high]
		if len(s.Pages) > 0 {
			n.Date = s.Pages[0].Date
			n.Lastmod = s.Pages[0].Lastmod
		}

		rssLayouts := []string{"rss.xml", "_default/rss.xml", "_internal/_default/rss.xml"}

		if err := s.renderAndWriteXML("homepage rss", viper.GetString("RSSUri"), n, s.appendThemeTemplates(rssLayouts)...); err != nil {
			return err
		}
	}

	// TODO(bep) reusing the Home Node smells trouble
	n.URL = helpers.URLize("404.html")
	n.IsHome = false
	n.Title = "404 Page not found"
	n.Permalink = s.permalink("404.html")
	n.scratch = newScratch()

	nfLayouts := []string{"404.html"}
	if nfErr := s.renderAndWritePage("404 page", "404.html", n, s.appendThemeTemplates(nfLayouts)...); nfErr != nil {
		return nfErr
	}

	return nil
}

func taxonomyRenderer(s *Site, taxes <-chan taxRenderInfo, results chan<- error, wg *sync.WaitGroup) {
	defer wg.Done()

	var n *Node

	for t := range taxes {

		var base string
		layouts := s.appendThemeTemplates(
			[]string{"taxonomy/" + t.singular + ".html", "indexes/" + t.singular + ".html", "_default/taxonomy.html", "_default/list.html"})

		n, base = s.newTaxonomyNode(t)

		dest := base
		if viper.GetBool("UglyURLs") {
			dest = helpers.Uglify(base + ".html")
		} else {
			dest = helpers.PrettifyPath(base + "/index.html")
		}

		if err := s.renderAndWritePage("taxonomy "+t.singular, dest, n, layouts...); err != nil {
			results <- err
			continue
		}

		if n.paginator != nil {

			paginatePath := viper.GetString("paginatePath")

			// write alias for page 1
			s.WriteDestAlias(helpers.PaginateAliasPath(base, 1), s.permalink(base))

			pagers := n.paginator.Pagers()

			for i, pager := range pagers {
				if i == 0 {
					// already created
					continue
				}

				taxonomyPagerNode, _ := s.newTaxonomyNode(t)
				taxonomyPagerNode.paginator = pager
				if pager.TotalPages() > 0 {
					first, _ := pager.page(0)
					taxonomyPagerNode.Date = first.Date
					taxonomyPagerNode.Lastmod = first.Lastmod
				}
				pageNumber := i + 1
				htmlBase := fmt.Sprintf("/%s/%s/%d", base, paginatePath, pageNumber)
				if err := s.renderAndWritePage(fmt.Sprintf("taxonomy %s", t.singular), htmlBase, taxonomyPagerNode, layouts...); err != nil {
					results <- err
					continue
				}
			}
		}

		if !viper.GetBool("DisableRSS") {
			// XML Feed
			rssuri := viper.GetString("RSSUri")
			n.URL = s.permalinkStr(base + "/" + rssuri)
			n.Permalink = s.permalink(base)
			rssLayouts := []string{"taxonomy/" + t.singular + ".rss.xml", "_default/rss.xml", "rss.xml", "_internal/_default/rss.xml"}

			if err := s.renderAndWriteXML("taxonomy "+t.singular+" rss", base+"/"+rssuri, n, s.appendThemeTemplates(rssLayouts)...); err != nil {
				results <- err
				continue
			}
		}
	}
}