feat: SEO field types and the complete SEO tab

classes/entries.go

@@ -3,6 +3,7 @@ package classes
 import (
 	"context"
 	"fmt"
+	"sort"
 	"strings"
 
 	"git.golem15.com/golem15/sm-seo-plugin/models"
@@ -17,6 +18,26 @@ var EntryColumns = []string{
 	"og_title", "og_description", "og_image",
 }
 
+// SharedColumn is the column whose value is one per record, shared by
+// every locale row (Q-5): the social image.
+const SharedColumn = "og_image"
+
+// SharedValue returns a record's shared social image: the first non-empty
+// value in locale order.
+func SharedValue(entries map[string]models.Entry) string {
+	locales := make([]string, 0, len(entries))
+	for locale := range entries {
+		locales = append(locales, locale)
+	}
+	sort.Strings(locales)
+	for _, locale := range locales {
+		if v := entries[locale].OGImage; v != "" {
+			return v
+		}
+	}
+	return ""
+}
+
 // FieldPrefix is the prefix of the SEO tab's field names (seo_title, ...),
 // so they never collide with an owner's fields.
 const FieldPrefix = "seo_"
@@ -130,8 +151,29 @@ func (s *Service) SaveRecord(ctx context.Context, db *gorm.DB, in RecordWrite) (
 		before[locale] = e
 	}
 	described := s.recordLocales(ctx, in.Type.Key, in.ID)
+	values := in.Values
+	if shared, ok := values[SharedColumn]; ok {
+		// One value for every locale of the record (Q-5).
+		v := ""
+		for _, text := range shared {
+			v = text
+		}
+		all := map[string]string{}
+		for locale := range existing {
+			all[locale] = v
+		}
+		for locale := range described {
+			all[locale] = v
+		}
+		copied := RecordValues{}
+		for column, perLocale := range values {
+			copied[column] = perLocale
+		}
+		copied[SharedColumn] = all
+		values = copied
+	}
 	touched := map[string]models.Entry{}
-	for column, perLocale := range in.Values {
+	for column, perLocale := range values {
 		for locale, value := range perLocale {
 			e, ok := touched[locale]
 			if !ok {
@@ -156,6 +198,7 @@ func (s *Service) SaveRecord(ctx context.Context, db *gorm.DB, in RecordWrite) (
 		if l, ok := described[locale]; ok {
 			e.URL = l.URL
 		}
+		e.EffectiveTitle, e.EffectiveDescription = s.effectiveOf(ctx, db, in.Type.Key, e, described[locale], locale)
 		if e.ID == 0 {
 			if err := db.Create(&e).Error; err != nil {
 				return nil, nil, err
@@ -181,6 +224,21 @@ func (s *Service) SaveRecord(ctx context.Context, db *gorm.DB, in RecordWrite) (
 	return before, after, nil
 }
 
+// effectiveOf computes an entry's effective title and description cache.
+func (s *Service) effectiveOf(ctx context.Context, db *gorm.DB, key string, e models.Entry, l pact.ContentLocale, locale string) (string, string) {
+	settings, err := LoadSettings(db)
+	if err != nil {
+		return e.EffectiveTitle, e.EffectiveDescription
+	}
+	ts, err := LoadTypeSetting(db, key)
+	if err != nil {
+		return e.EffectiveTitle, e.EffectiveDescription
+	}
+	site := s.translatedSetting(ctx, db, &settings, "site_name", settings.SiteName, locale)
+	fallback := s.translatedSetting(ctx, db, &settings, "default_description", settings.DefaultDescription, locale)
+	return EffectiveValues(e, l, settings, ts, site, fallback)
+}
+
 // recordWhat is the history description of a record's SEO in a locale:
 // "SEO of <type> “<title>” (<locale>)".
 func (s *Service) recordWhat(typ pact.MenuItemType, id string, l pact.ContentLocale, locale string) string {