1 files changed, 103 insertions, 0 deletions
diff --git a/internal/blog/index.go b/internal/blog/index.go
new file mode 100644
index 0000000..a09b59e
--- /dev/null
+++ b/internal/blog/index.go
@@ -0,0 +1,103 @@
+package blog
+
+import (
+	"encoding/json"
+	"fmt"
+	"time"
+
+	"github.com/SayaAndy/saya-today-web/internal/frontmatter"
+)
+
+const IndexFileName = "index.json"
+const MedleysIndexFileName = "medleys.json"
+
+const IndexSchemaVersion = 2
+
+type IndexEntry struct {
+	Link             string    `json:"link"`
+	ModifiedTime     time.Time `json:"modifiedTime"`
+	Title            string    `json:"title"`
+	ShortDescription string    `json:"shortDescription"`
+	ActionDate       string    `json:"actionDate"`
+	PublishedTime    time.Time `json:"publishedTime"`
+	Thumbnail        string    `json:"thumbnail"`
+	Tags             []string  `json:"tags"`
+	Geolocation      string    `json:"geolocation"`
+	Medley           string    `json:"medley,omitempty"`
+	MedleyPart       int       `json:"medleyPart,omitempty"`
+}
+
+func (e IndexEntry) Metadata() *frontmatter.Metadata {
+	return &frontmatter.Metadata{
+		Title:            e.Title,
+		ShortDescription: e.ShortDescription,
+		ActionDate:       e.ActionDate,
+		PublishedTime:    e.PublishedTime,
+		Thumbnail:        e.Thumbnail,
+		Tags:             e.Tags,
+		Geolocation:      e.Geolocation,
+		Medley:           e.Medley,
+		MedleyPart:       e.MedleyPart,
+	}
+}
+
+type IndexV2Category struct {
+	GeneratedAt time.Time             `json:"generatedAt"`
+	Pages       map[string]IndexEntry `json:"pages"`
+}
+
+type IndexV1Category struct {
+	GeneratedAt time.Time    `json:"generatedAt"`
+	Pages       []IndexEntry `json:"pages"`
+}
+
+type Index struct {
+	SchemaVersion int       `json:"schemaVersion"`
+	GeneratedAt   time.Time `json:"generatedAt"`
+	Categories    any       `json:"categories"`
+}
+
+func (idx *Index) UnmarshalJSON(data []byte) error {
+	var tmp struct {
+		SchemaVersion int             `json:"schemaVersion"`
+		GeneratedAt   time.Time       `json:"generatedAt"`
+		Categories    json.RawMessage `json:"categories"`
+	}
+
+	if err := json.Unmarshal(data, &tmp); err != nil {
+		return err
+	}
+
+	idx.SchemaVersion = tmp.SchemaVersion
+	idx.GeneratedAt = tmp.GeneratedAt
+
+	switch tmp.SchemaVersion {
+	case 1:
+		var categories map[string]*IndexV1Category
+		if err := json.Unmarshal(tmp.Categories, &categories); err != nil {
+			return fmt.Errorf("unmarshal map[string]*IndexV1Category: %w", err)
+		}
+		idx.Categories = &categories
+	case 2:
+		var categories map[string]*IndexV2Category
+		if err := json.Unmarshal(tmp.Categories, &categories); err != nil {
+			return fmt.Errorf("unmarshal map[string]*IndexV2Category: %w", err)
+		}
+		idx.Categories = &categories
+	default:
+		return fmt.Errorf("unsupported index version: %d", tmp.SchemaVersion)
+	}
+
+	return nil
+}
+
+type MedleyEntry struct {
+	Codename   string            `json:"codename"`
+	Localnames map[string]string `json:"localnames"`
+	Content    []string          `json:"content"`
+}
+
+type MedleyPageEntry struct {
+	Codename string `json:"codename"`
+	Position int    `json:"position"`
+}