1 files changed, 92 insertions, 0 deletions
diff --git a/internal/storage/index.go b/internal/storage/index.go
new file mode 100644
index 0000000..bfeafbe
--- /dev/null
+++ b/internal/storage/index.go
@@ -0,0 +1,92 @@
+package storage
+
+import (
+	"encoding/json"
+	"fmt"
+	"time"
+)
+
+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"`
+}
+
+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 IndexV1 struct {
+	SchemaVersion int                         `json:"schemaVersion"`
+	GeneratedAt   time.Time                   `json:"generatedAt"`
+	Categories    map[string]*IndexV1Category `json:"categories"`
+}
+
+type MedleyEntry struct {
+	Codename string   `json:"codename"`
+	Content  []string `json:"content"`
+}
+
+type MedleyPageEntry struct {
+	Codename string `json:"codename"`
+	Position int    `json:"position"`
+}