Add server-side branch prefix search

src/VCS/Adapter/Git/GitHub.php

@@ -742,32 +742,86 @@ public function getPullRequestFromBranch(string $owner, string $repositoryName,
     }
 
     /**
-     * Lists branches for a given repository
+     * Lists branches using GitHub GraphQL repository.refs with prefix search and cursor pagination.
      *
-     * @param  string  $owner Owner name of the repository
-     * @param  string  $repositoryName Name of the GitHub repository
-     * @param  int  $perPage Number of branches to fetch per page
-     * @param  int  $page Page number to start fetching from
-     * @return array<string> List of branch names as array
+     * GraphQL refs(query:) does server-side substring filtering; prefix semantics are enforced client-side with str_starts_with.
+     * Pass a cursor string from a previous nextCursor as $page to resume pagination; any integer
+     * value is treated as the first page. perPage is clamped to [1, 100].
+     *
+     * We use GraphQL instead of REST because:
+     *  1. REST GET /repos/{owner}/{repo}/branches has no search/filter parameter.
+     *  2. REST only supports integer page offsets; GraphQL edges carry cursors for exact resumption.
+     *
+     * @param  string  $owner
+     * @param  string  $repositoryName
+     * @param  int  $perPage Clamped to [1, 100]
+     * @param  int|string|null  $page Pass a cursor string from nextCursor to resume; integers treated as page 1
+     * @param  string  $search Prefix filter; empty returns all branches
+     * @return array{items: array<string>, hasNext: bool, nextCursor: string|null}
      */
-    public function listBranches(string $owner, string $repositoryName, int $perPage = 100, int $page = 1): array
+    public function listBranches(string $owner, string $repositoryName, int $perPage = 100, int|string|null $page = 1, string $search = ''): array
     {
-        $url = "/repos/$owner/$repositoryName/branches";
         $perPage = min(max($perPage, 1), 100);
-
-        $response = $this->call(self::METHOD_GET, $url, ['Authorization' => "Bearer $this->accessToken"], [
-            'page' => $page,
-            'per_page' => $perPage,
+        $cursor = is_string($page) ? $page : null;
+
+        $gql = <<<'GRAPHQL'
+query ListBranches($owner: String!, $name: String!, $first: Int!, $after: String, $query: String) {
+  repository(owner: $owner, name: $name) {
+    refs(refPrefix: "refs/heads/", first: $first, after: $after, orderBy: {field: ALPHABETICAL, direction: ASC}, query: $query) {
+      edges {
+        cursor
+        node {
+          name
+        }
+      }
+      pageInfo {
+        hasNextPage
+        endCursor
+      }
+    }
+  }
+}
+GRAPHQL;
+
+        $response = $this->call(self::METHOD_POST, '/graphql', ['Authorization' => "Bearer $this->accessToken"], [
+            'query' => $gql,
+            'variables' => [
+                'owner' => $owner,
+                'name' => $repositoryName,
+                'first' => $perPage,
+                'after' => $cursor,
+                'query' => $search !== '' ? $search : null,
+            ],
         ]);
 
         $statusCode = $response['headers']['status-code'] ?? 0;
         $responseBody = $response['body'] ?? [];
 
-        if ($statusCode < 200 || $statusCode >= 300 || !is_array($responseBody)) {
-            return [];
+        if ($statusCode < 200 || $statusCode >= 300 || !is_array($responseBody) || array_key_exists('errors', $responseBody)) {
+            return ['items' => [], 'hasNext' => false, 'nextCursor' => null];
         }
 
-        return array_values(array_map(fn ($branch) => $branch['name'] ?? '', $responseBody));
+        $repository = $responseBody['data']['repository'] ?? null;
+        $refs = is_array($repository) ? ($repository['refs'] ?? null) : null;
+
+        if (!is_array($refs)) {
+            return ['items' => [], 'hasNext' => false, 'nextCursor' => null];
+        }
+
+        $edges = $refs['edges'] ?? [];
+        $pageInfo = $refs['pageInfo'] ?? [];
+        $hasNext = (bool) ($pageInfo['hasNextPage'] ?? false);
+
+        // GitHub refs(query:) does substring matching; enforce prefix semantics client-side.
+        if ($search !== '') {
+            $edges = array_values(array_filter($edges, fn ($edge) => str_starts_with($edge['node']['name'] ?? '', $search)));
+        }
+
+        return [
+            'items' => array_map(fn ($edge) => $edge['node']['name'] ?? '', $edges),
+            'hasNext' => $hasNext,
+            'nextCursor' => $hasNext ? ($pageInfo['endCursor'] ?? null) : null,
+        ];
     }
 
     /**
@@ -831,15 +885,15 @@ public function getLatestCommit(string $owner, string $repositoryName, string $b
         $responseBody = $response['body'] ?? [];
         $responseBodyCommit = $responseBody['commit'] ?? [];
         $responseBodyCommitAuthor = $responseBodyCommit['author'] ?? [];
-        $responseBodyAuthor = $responseBody['author'] ?? [];
+        // GitHub sets author to null for commits from App installations whose email
+        // does not match any GitHub user — treat it as an empty array to allow fallbacks.
+        $responseBodyAuthor = is_array($responseBody['author'] ?? null) ? $responseBody['author'] : [];
 
         if (
             !array_key_exists('name', $responseBodyCommitAuthor) ||
             !array_key_exists('message', $responseBodyCommit) ||
             !array_key_exists('sha', $responseBody) ||
-            !array_key_exists('html_url', $responseBody) ||
-            !array_key_exists('avatar_url', $responseBodyAuthor) ||
-            !array_key_exists('html_url', $responseBodyAuthor)
+            !array_key_exists('html_url', $responseBody)
         ) {
             throw new Exception("Latest commit response is missing required information.");
         }