feat: Improved opengraph defaults.

opengraph.odin

@@ -1,7 +1,5 @@
 package main
 
-import "core:fmt"
-
 Open_Graph :: struct {
 	title:          string,
 	type:           string,
@@ -10,31 +8,110 @@ Open_Graph :: struct {
 	description:    string,
 	locale:         string,
 	site_name:      string,
-	is_article:     bool,
+	is_article:     Maybe(bool),
 	published_time: string,
 	modified_time:  string,
 	section:        string,
 }
 
-og_init :: proc(site: Site) -> Open_Graph {
-	return {
-		site_name = site.title,
-		description = site.description,
-		image = fmt.tprintf("%s/avatar.jpg", site.base_url),
-		locale = "en_US",
+og_for_site :: proc(site: ^Site) -> Open_Graph {
+	og := site.og
+	if og.site_name == "" {
+		og.site_name = site.title
+	}
+	if og.description == "" {
+		og.description = site.description
+	}
+	if og.locale == "" {
+		og.locale = "en_US"
 	}
-}
-
-og_for_page :: proc(site: Site, page: Page, base: Open_Graph) -> Open_Graph {
-	og := base
-	is_article := page.section != ""
-	og.url = page.url
-	og.title = strip_html_tags(page.title, context.temp_allocator)
-	og.type = "article" if is_article else "website"
-	og.is_article = is_article
-	og.section = page.section
-	og.published_time = page.date
-
 	return og
 }
 
+og_for_page :: proc(site_og: Open_Graph, page: Page) -> Open_Graph {
+	og := site_og
+
+	is_article := !page._is_index
+	if page.url != "" {
+		og.url = page.url
+	}
+	if page.title != "" {
+		og.title = strip_html_tags(page.title, context.temp_allocator)
+	} else {
+		og.title = og.site_name
+	}
+	og.type = "article" if is_article else "website"
+	og.is_article = is_article
+	if page.section != "" {
+		og.section = page.section
+	}
+	if is_article {
+		if page.date != "" {
+			og.published_time = page.date
+		}
+		if page.lastmod != "" {
+			og.modified_time = page.lastmod
+		} else if page.date != "" {
+			og.modified_time = page.date
+		}
+	}
+
+	// Description priority for articles:
+	//   page.og.description > page.description > body summary > inherited
+	// For non-articles (home, section index), inherited site.og.description
+	// is the fallback (matches production behavior — home inherits site
+	// description, section index is empty).
+	description_set := false
+	if page.og.description != "" {
+		og.description = page.og.description
+		description_set = true
+	}
+	if !description_set && page.description != "" {
+		og.description = page.description
+		description_set = true
+	}
+	if !description_set && is_article && page.body_html != "" {
+		og.description = generate_summary(page.body_html)
+		description_set = true
+	}
+	if !description_set {
+		if page._is_index && page.section == "" {
+			// Home: keep inherited site.og.description.
+		} else {
+			og.description = ""
+		}
+	}
+
+	if page.og.title != "" {
+		og.title = page.og.title
+	}
+	if page.og.type != "" {
+		og.type = page.og.type
+	}
+	if page.og.image != "" {
+		og.image = page.og.image
+	}
+	if page.og.url != "" {
+		og.url = page.og.url
+	}
+	if page.og.locale != "" {
+		og.locale = page.og.locale
+	}
+	if page.og.site_name != "" {
+		og.site_name = page.og.site_name
+	}
+	if page.og.published_time != "" {
+		og.published_time = page.og.published_time
+	}
+	if page.og.modified_time != "" {
+		og.modified_time = page.og.modified_time
+	}
+	if page.og.section != "" {
+		og.section = page.og.section
+	}
+	if page.og.is_article != nil {
+		og.is_article = page.og.is_article
+	}
+
+	return og
+}