// Copyright 2016 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

// TODO: This will move to //third_party/WebKit when //content/child/indexed_db
// is deleted but for now this will depend on //content/common types and so
// so belongs here.

module indexed_db.mojom;

import "mojo/common/file_path.mojom";
import "mojo/common/string16.mojom";
import "mojo/common/time.mojom";
import "storage/public/interfaces/blobs.mojom";
import "url/mojo/origin.mojom";

enum CursorDirection {
  Next,
  NextNoDuplicate,
  Prev,
  PrevNoDuplicate,
};

enum DataLoss {
  None,
  Total,
};

// Represents key types that hold no data and so cannot be options in the
// KeyData union.
// TODO(jsbell): These types should be cleaned up end-to-end, leaving only the
// dataful options.
enum DatalessKeyType {
  Invalid,
  Null,
};

union KeyData {
  array<Key> key_array;
  array<uint8> binary;
  mojo.common.mojom.String16 string;
  double date;
  double number;
  DatalessKeyType other;
};

// Defined as a structure so that it can by typemapped with StructTraits.
struct Key {
  KeyData data;
};

// Represents WebIDBKeyPathTypeString and WebIDBKeyPathTypeArray in a key path.
union KeyPathData {
  mojo.common.mojom.String16 string;
  array<mojo.common.mojom.String16> string_array;
};

struct KeyPath {
  // A null value here corresponds to WebIDBKeyPathTypeNull.
  KeyPathData? data;
};

struct KeyRange {
  Key lower;
  Key upper;
  bool lower_open;
  bool upper_open;
};

enum OperationType {
  Add,
  Put,
  Delete,
  Clear,
};

enum PutMode {
  AddOrUpdate,
  AddOnly,
  CursorUpdate,
};

enum TaskType {
  Normal,
  Preemptive,
};

enum TransactionMode {
  ReadOnly,
  ReadWrite,
  VersionChange,
};

enum Status {
  OK,
  NotFound,
  Corruption,
  NotSupported,
  InvalidArgument,
  IOError,
};

struct IndexMetadata {
  int64 id;
  mojo.common.mojom.String16 name;
  KeyPath key_path;
  bool unique;
  bool multi_entry;
};

struct ObjectStoreMetadata {
  int64 id;
  mojo.common.mojom.String16 name;
  KeyPath key_path;
  bool auto_increment;
  int64 max_index_id;
  array<IndexMetadata> indexes;
};

struct DatabaseMetadata {
  int64 id;
  mojo.common.mojom.String16 name;
  int64 version;
  int64 max_object_store_id;
  array<ObjectStoreMetadata> object_stores;
};

struct IndexKeys {
  int64 index_id;
  array<Key> index_keys;
};

struct FileInfo {
  mojo.common.mojom.FilePath path;
  mojo.common.mojom.String16 name;
  mojo.common.mojom.Time last_modified;
};

struct BlobInfo {
  storage.mojom.Blob? blob;
  string uuid;
  mojo.common.mojom.String16 mime_type;
  int64 size;
  FileInfo? file;
};

struct Value {
  string bits;
  array<BlobInfo> blob_or_file_info;
};

struct ReturnValue {
  Value value;
  Key primary_key;
  KeyPath key_path;
};

struct Observation {
  int64 object_store_id;
  OperationType type;
  KeyRange key_range;
  Value? value;
};

struct ObserverTransaction {
  int64 id;
  array<int64> scope;
};

struct ObserverChanges {
  map<int32, array<int32>> observation_index_map;
  map<int32, ObserverTransaction> transaction_map;
  array<Observation> observations;
};

// The Callbacks interface is used to return results for individual requests.
// Some requests may return multiple results before completion, such as
// UpgradeNeeded before SuccessDatabase.
//
// TODO(https://crbug.com/627484): Many of these could be replaced with
// replies associated with particular messages.
interface Callbacks {
  Error(int32 code, mojo.common.mojom.String16 message);

  // Factory::GetDatabaseNames
  SuccessStringList(array<mojo.common.mojom.String16> value);

  // Factory::Open / DeleteDatabase
  Blocked(int64 existing_version);

  // Factory::Open
  UpgradeNeeded(associated Database database, int64 old_version,
                DataLoss data_loss, string data_loss_message,
                DatabaseMetadata db_metadata);
  SuccessDatabase(associated Database? database, DatabaseMetadata metadata);

  // Database::OpenCursor
  SuccessCursor(associated Cursor cursor,
                Key key,
                Key primary_key,
                Value? value);

  // Database::Get / Cursor::Advance
  SuccessValue(ReturnValue? value);

  // Cursor::Continue / Advance
  SuccessCursorContinue(Key key, Key primary_key, Value? value);

  // Cursor::Prefetch
  SuccessCursorPrefetch(array<Key> keys,
                        array<Key> primary_keys,
                        array<Value> values);

  // Database::GetAll
  SuccessArray(array<ReturnValue> values);

  // Database::Put / Cursor::Update
  SuccessKey(Key key);

  // Database::Count / DeleteRange
  // Factory::DeleteDatabase
  SuccessInteger(int64 value);

  // Cursor::Continue / Advance
  Success();
};

// The DatabaseCallbacks interface is used to notification of events out of
// band to individual requests. A single instance is used for the lifetime of
// a database connection.
interface DatabaseCallbacks {
  ForcedClose();
  VersionChange(int64 old_version, int64 new_version);
  Abort(int64 transaction_id, int32 code,
        mojo.common.mojom.String16 message);
  Complete(int64 transaction_id);
  Changes(ObserverChanges changes);
};

interface Cursor {
  Advance(uint32 count, associated Callbacks callbacks);
  Continue(Key key, Key primary_key, associated Callbacks callbacks);
  Prefetch(int32 count, associated Callbacks callbacks);
  PrefetchReset(int32 used_prefetches, int32 unused_prefetches,
                array<string> unused_blob_uuids);
};

interface Database {
  CreateObjectStore(int64 transaction_id,
                    int64 object_store_id,
                    mojo.common.mojom.String16 name,
                    KeyPath key_path,
                    bool auto_increment);
  DeleteObjectStore(int64 transaction_id,
                    int64 object_store_id);
  RenameObjectStore(int64 transaction_id,
                    int64 object_store_id,
                    mojo.common.mojom.String16 new_name);
  CreateTransaction(int64 transaction_id,
                    array<int64> object_store_ids,
                    TransactionMode mode);
  Close();
  VersionChangeIgnored();
  AddObserver(int64 transaction_id,
              int32 observer_id,
              bool include_transaction,
              bool no_records,
              bool values,
              uint16 operation_types);
  RemoveObservers(array<int32> observers);
  Get(int64 transaction_id,
      int64 object_store_id,
      int64 index_id,
      KeyRange key_range,
      bool key_only,
      associated Callbacks callbacks);
  GetAll(int64 transaction_id,
         int64 object_store_id,
         int64 index_id,
         KeyRange key_range,
         bool key_only,
         int64 max_count,
         associated Callbacks callbacks);
  Put(int64 transaction_id,
      int64 object_store_id,
      Value value,
      Key key,
      PutMode mode,
      array<IndexKeys> index_keys,
      associated Callbacks callbacks);
  SetIndexKeys(int64 transaction_id,
               int64 object_store_id,
               Key primary_key,
               array<IndexKeys> index_keys);
  SetIndexesReady(int64 transaction_id,
                  int64 object_store_id,
                  array<int64> index_ids);
  OpenCursor(int64 transaction_id,
             int64 object_store_id,
             int64 index_id,
             KeyRange key_range,
             CursorDirection direction,
             bool key_only,
             TaskType task_type,
             associated Callbacks callbacks);
  Count(int64 transaction_id,
        int64 object_store_id,
        int64 index_id,
        KeyRange key_range,
        associated Callbacks callbacks);
  DeleteRange(int64 transaction_id,
              int64 object_store_id,
              KeyRange key_range,
              associated Callbacks callbacks);
  Clear(int64 transaction_id,
        int64 object_store_id,
        associated Callbacks callbacks);
  CreateIndex(int64 transaction_id,
              int64 object_store_id,
              int64 index_id,
              mojo.common.mojom.String16 name,
              KeyPath key_path,
              bool unique,
              bool multi_entry);
  DeleteIndex(int64 transaction_id,
              int64 object_store_id,
              int64 index_id);
  RenameIndex(int64 transaction_id,
              int64 object_store_id,
              int64 index_id,
              mojo.common.mojom.String16 new_name);
  Abort(int64 transaction_id);
  Commit(int64 transaction_id);
  AckReceivedBlobs(array<string> uuids);
};

interface Factory {
  GetDatabaseNames(associated Callbacks callbacks, url.mojom.Origin origin);
  Open(associated Callbacks callbacks,
       associated DatabaseCallbacks database_callbacks, url.mojom.Origin origin,
       mojo.common.mojom.String16 name, int64 version, int64 transaction_id);
  DeleteDatabase(associated Callbacks callbacks, url.mojom.Origin origin,
                 mojo.common.mojom.String16 name, bool force_close);
  AbortTransactionsAndCompactDatabase(url.mojom.Origin origin) => (Status status);
  AbortTransactionsForDatabase(url.mojom.Origin origin) => (Status status);
};