sync: batch file identification via hash lookup

Signed-off-by: NotAShelf <raf@notashelf.dev>
Change-Id: I85d3f1265cad1996340ac98ac9ee1f7e6a6a6964

src/platform/curseforge.rs

@@ -403,6 +403,78 @@ impl PlatformClient for CurseForgePlatform {
       Err(e) => Err(e),
     }
   }
+
+  async fn request_projects_from_hashes(
+    &self,
+    hashes: &[String],
+    _algorithm: &str,
+  ) -> Result<Vec<Project>> {
+    if hashes.is_empty() {
+      return Ok(Vec::new());
+    }
+
+    let fingerprints: Vec<u32> = hashes
+      .iter()
+      .filter_map(|h| h.parse::<u32>().ok())
+      .collect();
+
+    if fingerprints.is_empty() {
+      return Ok(Vec::new());
+    }
+
+    #[derive(Serialize)]
+    struct FingerprintRequest {
+      fingerprints: Vec<u32>,
+    }
+
+    let url = format!("{CURSEFORGE_API_BASE}/fingerprints/432");
+    let response = self
+      .client
+      .post(&url)
+      .headers(self.get_headers()?)
+      .json(&FingerprintRequest {
+        fingerprints: fingerprints.clone(),
+      })
+      .send()
+      .await?;
+
+    if !response.status().is_success() {
+      return Err(PakkerError::PlatformApiError(format!(
+        "CurseForge batch API error: {}",
+        response.status()
+      )));
+    }
+
+    let response_data: serde_json::Value = response.json().await?;
+
+    let matches = response_data["data"]["exactMatches"]
+      .as_array()
+      .cloned()
+      .unwrap_or_default();
+
+    let mut projects = Vec::new();
+    let mut seen_ids = std::collections::HashSet::new();
+
+    for m in matches {
+      if let Some(file) = m["file"].as_object() {
+        if let Some(mod_id) = file["modId"].as_u64() {
+          let mod_id_str = mod_id.to_string();
+          if seen_ids.contains(&mod_id_str) {
+            continue;
+          }
+          seen_ids.insert(mod_id_str.clone());
+
+          if let Ok(project) =
+            self.request_project_with_files(&mod_id_str, &[], &[]).await
+          {
+            projects.push(project);
+          }
+        }
+      }
+    }
+
+    Ok(projects)
+  }
 }
 
 // CurseForge API models