syntax = "proto3";

package gitks;

import "google/protobuf/empty.proto";
import "oid.proto";

// Repository identity used by storage-facing RPCs.
message RepositoryHeader {
  // Logical storage shard or disk name.
  string storage_name = 1;
  // Path relative to the storage root, usually ending in `.git` for bare repos.
  string relative_path = 2;
  // Optional absolute path for embedded/local deployments.
  string storage_path = 3;
}

message Repository {
  RepositoryHeader header = 1;
  bool bare = 2;
  bool empty = 3;
  ObjectFormat object_format = 4;
  string default_branch = 5;
  string git_object_directory = 6;
  repeated string git_alternate_object_directories = 7;
}

message RepositoryStatistics {
  uint64 size_bytes = 1;
  uint64 loose_object_count = 2;
  uint64 packed_object_count = 3;
  uint64 packfile_count = 4;
  uint64 reference_count = 5;
  uint64 commit_graph_size_bytes = 6;
  uint64 multi_pack_index_size_bytes = 7;
}

message RepositoryConfigEntry {
  string key = 1;
  repeated string values = 2;
}

message RepositoryObjectFormatRequest {
  RepositoryHeader repository = 1;
}

message RepositoryObjectFormatResponse {
  ObjectFormat object_format = 1;
}

message GetRepositoryRequest {
  RepositoryHeader repository = 1;
}

message InitRepositoryRequest {
  RepositoryHeader repository = 1;
  bool bare = 2;
  ObjectFormat object_format = 3;
  string initial_branch = 4;
}

message DeleteRepositoryRequest {
  RepositoryHeader repository = 1;
}

message RepositoryExistsRequest {
  RepositoryHeader repository = 1;
}

message RepositoryExistsResponse {
  bool exists = 1;
}

message GetDefaultBranchRequest {
  RepositoryHeader repository = 1;
}

message GetDefaultBranchResponse {
  string name = 1;
}

message SetDefaultBranchRequest {
  RepositoryHeader repository = 1;
  string name = 2;
}

message GetRepositoryConfigRequest {
  RepositoryHeader repository = 1;
  repeated string keys = 2;
}

message GetRepositoryConfigResponse {
  repeated RepositoryConfigEntry entries = 1;
}

message SetRepositoryConfigRequest {
  RepositoryHeader repository = 1;
  repeated RepositoryConfigEntry entries = 2;
}

message RepositoryStatisticsRequest {
  RepositoryHeader repository = 1;
}

message RepositoryHealthRequest {
  RepositoryHeader repository = 1;
  bool connectivity_only = 2;
}

message RepositoryHealthResponse {
  bool ok = 1;
  repeated string warnings = 2;
  repeated string errors = 3;
  RepositoryStatistics statistics = 4;
}

message GarbageCollectRequest {
  RepositoryHeader repository = 1;
  bool prune = 2;
  bool aggressive = 3;
}

message RepackRequest {
  RepositoryHeader repository = 1;
  bool full = 2;
  bool write_bitmaps = 3;
  bool write_multi_pack_index = 4;
}

message WriteCommitGraphRequest {
  RepositoryHeader repository = 1;
  bool replace = 2;
  bool split = 3;
}

message RepositoryMaintenanceResponse {
  bool ok = 1;
  string stdout = 2;
  string stderr = 3;
}

// ── Hooks Management ──────────────────────────────────────────────────

message ListHooksRequest {
  RepositoryHeader repository = 1;
}

message HookInfo {
  string hook_type = 1;
  string level = 2; // "server" or "custom"
  string path = 3;
}

message ListHooksResponse {
  repeated HookInfo hooks = 1;
}

message SetCustomHookRequest {
  RepositoryHeader repository = 1;
  string hook_name = 2; // "pre-receive", "update", "post-receive"
  string content = 3;  // Hook script content
}

message RemoveCustomHookRequest {
  RepositoryHeader repository = 1;
  string hook_name = 2;
}

// ── Snapshot ──────────────────────────────────────────────────────────

enum SnapshotStorage {
  SNAPSHOT_STORAGE_LOCAL = 0;
  SNAPSHOT_STORAGE_S3 = 1;
  SNAPSHOT_STORAGE_GCS = 2;
}

message SnapshotInfo {
  string snapshot_id = 1;
  string relative_path = 2;
  uint64 size_bytes = 3;
  string created_at = 4; // ISO 8601
  string head_oid = 5;
}

message CreateSnapshotRequest {
  RepositoryHeader repository = 1;
  SnapshotStorage storage = 2;
  string storage_path = 3;
}

message CreateSnapshotResponse {
  string snapshot_id = 1;
  uint64 size_bytes = 2;
  string head_oid = 3;
}

message RestoreSnapshotRequest {
  RepositoryHeader target_repository = 1;
  string snapshot_id = 2;
  SnapshotStorage storage = 3;
  string storage_path = 4;
}

message ListSnapshotsRequest {
  RepositoryHeader repository = 1;
  uint32 limit = 2;
}

message ListSnapshotsResponse {
  repeated SnapshotInfo snapshots = 1;
}

message DeleteSnapshotRequest {
  string snapshot_id = 1;
  SnapshotStorage storage = 2;
}

// ── Repository Move ──────────────────────────────────────────────────

enum MoveRepositoryState {
  MOVE_STATE_UNKNOWN = 0;
  MOVE_STATE_PREPARING = 1;
  MOVE_STATE_TRANSFERRING = 2;
  MOVE_STATE_VERIFYING = 3;
  MOVE_STATE_COMPLETED = 4;
  MOVE_STATE_FAILED = 5;
  MOVE_STATE_CANCELLED = 6;
}

message MoveRepositoryRequest {
  RepositoryHeader source_repository = 1;
  RepositoryHeader target_repository = 2;
}

message MoveRepositoryResponse {
  MoveRepositoryState state = 1;
  string error_message = 2;
}

message FetchRepositoryDataRequest {
  RepositoryHeader repository = 1;
}

message FetchRepositoryDataResponse {
  bytes data = 1;
  bool done = 2;
}

service RepositoryService {
  rpc GetRepository(GetRepositoryRequest) returns (Repository);
  rpc InitRepository(InitRepositoryRequest) returns (Repository);
  rpc DeleteRepository(DeleteRepositoryRequest) returns (google.protobuf.Empty);
  rpc RepositoryExists(RepositoryExistsRequest) returns (RepositoryExistsResponse);
  rpc GetObjectFormat(RepositoryObjectFormatRequest) returns (RepositoryObjectFormatResponse);
  rpc GetDefaultBranch(GetDefaultBranchRequest) returns (GetDefaultBranchResponse);
  rpc SetDefaultBranch(SetDefaultBranchRequest) returns (google.protobuf.Empty);
  rpc GetRepositoryConfig(GetRepositoryConfigRequest) returns (GetRepositoryConfigResponse);
  rpc SetRepositoryConfig(SetRepositoryConfigRequest) returns (google.protobuf.Empty);
  rpc GetRepositoryStatistics(RepositoryStatisticsRequest) returns (RepositoryStatistics);
  rpc CheckRepositoryHealth(RepositoryHealthRequest) returns (RepositoryHealthResponse);
  rpc GarbageCollect(GarbageCollectRequest) returns (RepositoryMaintenanceResponse);
  rpc Repack(RepackRequest) returns (RepositoryMaintenanceResponse);
  rpc WriteCommitGraph(WriteCommitGraphRequest) returns (RepositoryMaintenanceResponse);

  // Hooks management
  rpc ListHooks(ListHooksRequest) returns (ListHooksResponse);
  rpc SetCustomHook(SetCustomHookRequest) returns (google.protobuf.Empty);
  rpc RemoveCustomHook(RemoveCustomHookRequest) returns (google.protobuf.Empty);

  // Snapshot operations
  rpc CreateSnapshot(CreateSnapshotRequest) returns (CreateSnapshotResponse);
  rpc RestoreSnapshot(RestoreSnapshotRequest) returns (google.protobuf.Empty);
  rpc ListSnapshots(ListSnapshotsRequest) returns (ListSnapshotsResponse);
  rpc DeleteSnapshot(DeleteSnapshotRequest) returns (google.protobuf.Empty);

  // Repository move
  rpc MoveRepository(MoveRepositoryRequest) returns (MoveRepositoryResponse);
  rpc FetchRepositoryData(FetchRepositoryDataRequest) returns (stream FetchRepositoryDataResponse);
}