domain: add Media Catalog entities (Asset, Metadata, Stack, Derivative, Duplicate)

crates/domain/src/entities/asset.rs

@@ -0,0 +1,52 @@
+use crate::value_objects::{Checksum, DateTimeStamp, SystemId};
+
+#[derive(Debug, Clone, Copy, PartialEq, Eq, serde::Serialize, serde::Deserialize)]
+pub enum AssetType {
+    Image,
+    Video,
+    LivePhoto,
+}
+
+#[derive(Debug, Clone, PartialEq, Eq, serde::Serialize, serde::Deserialize)]
+pub struct SourceReference {
+    pub volume_id: SystemId,
+    pub relative_path: String,
+    pub checksum: Checksum,
+}
+
+#[derive(Debug, Clone, serde::Serialize, serde::Deserialize)]
+pub struct Asset {
+    pub asset_id: SystemId,
+    pub source_reference: SourceReference,
+    pub asset_type: AssetType,
+    pub mime_type: String,
+    pub file_size: u64,
+    pub is_processed: bool,
+    pub owner_user_id: SystemId,
+    pub created_at: DateTimeStamp,
+}
+
+impl Asset {
+    pub fn new(
+        source_reference: SourceReference,
+        asset_type: AssetType,
+        mime_type: impl Into<String>,
+        file_size: u64,
+        owner: SystemId,
+    ) -> Self {
+        Self {
+            asset_id: SystemId::new(),
+            source_reference,
+            asset_type,
+            mime_type: mime_type.into(),
+            file_size,
+            is_processed: false,
+            owner_user_id: owner,
+            created_at: DateTimeStamp::now(),
+        }
+    }
+
+    pub fn mark_processed(&mut self) {
+        self.is_processed = true;
+    }
+}