1 files changed, 70 insertions, 0 deletions
diff --git a/crates/vcs_data/src/data/local/latest_file_data.rs b/crates/vcs_data/src/data/local/latest_file_data.rs
new file mode 100644
index 0000000..f737650
--- /dev/null
+++ b/crates/vcs_data/src/data/local/latest_file_data.rs
@@ -0,0 +1,70 @@
+use std::{collections::HashMap, io::Error, path::PathBuf};
+
+use cfg_file::ConfigFile;
+use serde::{Deserialize, Serialize};
+
+use crate::{
+    constants::{CLIENT_FILE_MEMBER_HELD, CLIENT_FILE_MEMBER_HELD_NOSET},
+    current::current_local_path,
+    data::{
+        member::MemberId,
+        vault::virtual_file::{VirtualFileId, VirtualFileVersion},
+    },
+};
+
+const ACCOUNT: &str = "{account}";
+
+/// # Latest file data
+/// Records the file holder and the latest version for permission and update checks
+#[derive(Debug, Default, Clone, Serialize, Deserialize, ConfigFile)]
+#[cfg_file(path = CLIENT_FILE_MEMBER_HELD_NOSET)]
+pub struct LatestFileData {
+    /// File holding status
+    held_status: HashMap<VirtualFileId, HeldStatus>,
+
+    /// File version
+    versions: HashMap<VirtualFileId, VirtualFileVersion>,
+}
+
+#[derive(Debug, Default, Clone, Serialize, Deserialize)]
+pub enum HeldStatus {
+    HeldWith(MemberId), // Held, status changes are sync to the client
+    NotHeld,            // Not held, status changes are sync to the client
+
+    #[default]
+    WantedToKnow, // Holding status is unknown, notify server must inform client
+}
+
+impl LatestFileData {
+    /// Get the path to the file holding the held status information for the given member.
+    pub fn held_file_path(account: &MemberId) -> Result<PathBuf, std::io::Error> {
+        let Some(local_path) = current_local_path() else {
+            return Err(Error::new(
+                std::io::ErrorKind::NotFound,
+                "Workspace not found.",
+            ));
+        };
+        Ok(local_path.join(CLIENT_FILE_MEMBER_HELD.replace(ACCOUNT, account)))
+    }
+
+    /// Get the member who holds the file with the given ID.
+    pub fn file_holder(&self, vfid: &VirtualFileId) -> Option<&MemberId> {
+        self.held_status.get(vfid).and_then(|status| match status {
+            HeldStatus::HeldWith(id) => Some(id),
+            _ => None,
+        })
+    }
+
+    /// Update the held status of the files.
+    pub fn update_held_status(&mut self, map: HashMap<VirtualFileId, Option<MemberId>>) {
+        for (vfid, member_id) in map {
+            self.held_status.insert(
+                vfid,
+                match member_id {
+                    Some(member_id) => HeldStatus::HeldWith(member_id),
+                    None => HeldStatus::NotHeld,
+                },
+            );
+        }
+    }
+}