foo

backend/src/routes/documents/correspondent_utils.rs

@@ -0,0 +1,61 @@
+use std::collections::HashSet;
+
+use uuid::Uuid;
+
+use crate::error::{AppError, AppResult};
+
+use super::CorrespondentAssignmentInput;
+
+pub const CORRESPONDENT_ROLES: &[&str] = &["sender", "receiver", "other"];
+
+pub fn normalize_role(value: &str) -> String {
+    value.trim().to_lowercase()
+}
+
+pub fn is_valid_correspondent_role(role: &str) -> bool {
+    CORRESPONDENT_ROLES.iter().any(|allowed| *allowed == role)
+}
+
+pub fn normalize_correspondent_assignments(
+    assignments: &[CorrespondentAssignmentInput],
+) -> AppResult<(Vec<(Uuid, String)>, Vec<Uuid>, Vec<String>)> {
+    let mut unique_pairs: HashSet<(Uuid, String)> = HashSet::new();
+    let mut normalized_pairs: Vec<(Uuid, String)> = Vec::new();
+    let mut role_set: HashSet<String> = HashSet::new();
+    let mut correspondent_ids: HashSet<Uuid> = HashSet::new();
+
+    for assignment in assignments {
+        let role = normalize_role(&assignment.role);
+        if role.is_empty() {
+            return Err(AppError::bad_request("role must not be empty"));
+        }
+        if !is_valid_correspondent_role(&role) {
+            return Err(AppError::bad_request(format!(
+                "invalid correspondent role '{role}'. Allowed roles: {}",
+                CORRESPONDENT_ROLES.join(", ")
+            )));
+        }
+
+        if !unique_pairs.insert((assignment.correspondent_id, role.clone())) {
+            continue;
+        }
+
+        normalized_pairs.push((assignment.correspondent_id, role.clone()));
+        role_set.insert(role);
+        correspondent_ids.insert(assignment.correspondent_id);
+    }
+
+    if normalized_pairs.is_empty() {
+        return Err(AppError::bad_request(
+            "assignments must contain at least one unique correspondent/role pair",
+        ));
+    }
+
+    let mut correspondents_vec: Vec<Uuid> = correspondent_ids.into_iter().collect();
+    correspondents_vec.sort();
+
+    let mut roles_vec: Vec<String> = role_set.into_iter().collect();
+    roles_vec.sort();
+
+    Ok((normalized_pairs, correspondents_vec, roles_vec))
+}