#import "RNGestureHandlerModule.h"

#import <React/RCTComponent.h>
#import <React/RCTLog.h>
#import <React/RCTUIManager.h>
#import <React/RCTUIManagerObserverCoordinator.h>
#import <React/RCTUIManagerUtils.h>
#import <React/RCTViewManager.h>

#ifdef RN_FABRIC_ENABLED
#import <React/RCTBridge+Private.h>
#import <React/RCTBridge.h>
#import <React/RCTSurfacePresenter.h>
#import <React/RCTUtils.h>
#import <ReactCommon/CallInvoker.h>
#import <ReactCommon/RCTTurboModule.h>

#import <react/renderer/uimanager/primitives.h>
#endif // RN_FABRIC_ENABLED

#import "RNGestureHandler.h"
#import "RNGestureHandlerDirection.h"
#import "RNGestureHandlerManager.h"
#import "RNGestureHandlerState.h"

#import "RNGestureHandlerButton.h"
#import "RNGestureHandlerStateManager.h"

#ifdef RN_FABRIC_ENABLED
using namespace facebook;
using namespace react;
#endif // RN_FABRIC_ENABLED

#ifdef RN_FABRIC_ENABLED
@interface RNGestureHandlerModule () <RCTSurfacePresenterObserver, RNGestureHandlerStateManager>

@end
#else
@interface RNGestureHandlerModule () <RCTUIManagerObserver, RNGestureHandlerStateManager>

@end
#endif // RN_FABRIC_ENABLED

typedef void (^GestureHandlerOperation)(RNGestureHandlerManager *manager);

@implementation RNGestureHandlerModule {
  RNGestureHandlerManager *_manager;

  // Oparations called after views have been updated.
  NSMutableArray<GestureHandlerOperation> *_operations;
}

RCT_EXPORT_MODULE()

+ (BOOL)requiresMainQueueSetup
{
  return YES;
}

- (void)invalidate
{
  RNGestureHandlerManager *handlerManager = _manager;
  dispatch_async(dispatch_get_main_queue(), ^{
    [handlerManager dropAllGestureHandlers];
  });

  _manager = nil;

#ifdef RN_FABRIC_ENABLED
  [self.bridge.surfacePresenter removeObserver:self];
#else
  [self.bridge.uiManager.observerCoordinator removeObserver:self];
#endif // RN_FABRIC_ENABLED
}

- (dispatch_queue_t)methodQueue
{
  // This module needs to be on the same queue as the UIManager to avoid
  // having to lock `_operations` and `_preOperations` since `uiManagerWillFlushUIBlocks`
  // will be called from that queue.

  // This is required as this module rely on having all the view nodes created before
  // gesture handlers can be associated with them
  return RCTGetUIManagerQueue();
}

#ifdef RN_FABRIC_ENABLED
void decorateRuntime(jsi::Runtime &runtime)
{
  auto isFormsStackingContext = jsi::Function::createFromHostFunction(
      runtime,
      jsi::PropNameID::forAscii(runtime, "isFormsStackingContext"),
      1,
      [](jsi::Runtime &runtime, const jsi::Value &thisValue, const jsi::Value *arguments, size_t count) -> jsi::Value {
        if (!arguments[0].isObject()) {
          return jsi::Value::null();
        }

        auto shadowNode = arguments[0].asObject(runtime).getHostObject<ShadowNodeWrapper>(runtime)->shadowNode;
        bool isFormsStackingContext = shadowNode->getTraits().check(ShadowNodeTraits::FormsStackingContext);

        return jsi::Value(isFormsStackingContext);
      });
  runtime.global().setProperty(runtime, "isFormsStackingContext", std::move(isFormsStackingContext));
}
#endif // RN_FABRIC_ENABLED

- (void)setBridge:(RCTBridge *)bridge
{
  [super setBridge:bridge];

  _manager = [[RNGestureHandlerManager alloc] initWithUIManager:bridge.uiManager
                                                eventDispatcher:bridge.eventDispatcher];
  _operations = [NSMutableArray new];

#ifdef RN_FABRIC_ENABLED
  [bridge.surfacePresenter addObserver:self];
#else
  [bridge.uiManager.observerCoordinator addObserver:self];
#endif // RN_FABRIC_ENABLED
}

#ifdef RN_FABRIC_ENABLED
RCT_EXPORT_BLOCKING_SYNCHRONOUS_METHOD(install)
{
  RCTCxxBridge *cxxBridge = (RCTCxxBridge *)self.bridge;
  auto runtime = (jsi::Runtime *)cxxBridge.runtime;
  decorateRuntime(*runtime);
  return @true;
}
#endif // RN_FABRIC_ENABLED

RCT_EXPORT_METHOD(createGestureHandler
                  : (nonnull NSString *)handlerName tag
                  : (nonnull NSNumber *)handlerTag config
                  : (NSDictionary *)config)
{
  [self addOperationBlock:^(RNGestureHandlerManager *manager) {
    [manager createGestureHandler:handlerName tag:handlerTag config:config];
  }];
}

RCT_EXPORT_METHOD(attachGestureHandler
                  : (nonnull NSNumber *)handlerTag toViewWithTag
                  : (nonnull NSNumber *)viewTag actionType
                  : (nonnull NSNumber *)actionType)
{
  [self addOperationBlock:^(RNGestureHandlerManager *manager) {
    [manager attachGestureHandler:handlerTag
                    toViewWithTag:viewTag
                   withActionType:(RNGestureHandlerActionType)[actionType integerValue]];
  }];
}

RCT_EXPORT_METHOD(updateGestureHandler : (nonnull NSNumber *)handlerTag config : (NSDictionary *)config)
{
  [self addOperationBlock:^(RNGestureHandlerManager *manager) {
    [manager updateGestureHandler:handlerTag config:config];
  }];
}

RCT_EXPORT_METHOD(dropGestureHandler : (nonnull NSNumber *)handlerTag)
{
  [self addOperationBlock:^(RNGestureHandlerManager *manager) {
    [manager dropGestureHandler:handlerTag];
  }];
}

RCT_EXPORT_METHOD(handleSetJSResponder
                  : (nonnull NSNumber *)viewTag blockNativeResponder
                  : (nonnull NSNumber *)blockNativeResponder)
{
  [self addOperationBlock:^(RNGestureHandlerManager *manager) {
    [manager handleSetJSResponder:viewTag blockNativeResponder:blockNativeResponder];
  }];
}

RCT_EXPORT_METHOD(handleClearJSResponder)
{
  [self addOperationBlock:^(RNGestureHandlerManager *manager) {
    [manager handleClearJSResponder];
  }];
}

RCT_EXPORT_METHOD(flushOperations)
{
  if (_operations.count == 0) {
    return;
  }

  NSArray<GestureHandlerOperation> *operations = _operations;
  _operations = [NSMutableArray new];

  [self.bridge.uiManager
      addUIBlock:^(__unused RCTUIManager *manager, __unused NSDictionary<NSNumber *, UIView *> *viewRegistry) {
        for (GestureHandlerOperation operation in operations) {
          operation(self->_manager);
        }
      }];
}

- (void)setGestureState:(int)state forHandler:(int)handlerTag
{
  RNGestureHandler *handler = [_manager handlerWithTag:@(handlerTag)];

  if (handler != nil) {
    if (state == 1) { // FAILED
      handler.recognizer.state = UIGestureRecognizerStateFailed;
    } else if (state == 2) { // BEGAN
      handler.recognizer.state = UIGestureRecognizerStatePossible;
    } else if (state == 3) { // CANCELLED
      handler.recognizer.state = UIGestureRecognizerStateCancelled;
    } else if (state == 4) { // ACTIVE
      [handler stopActivationBlocker];
      handler.recognizer.state = UIGestureRecognizerStateBegan;
    } else if (state == 5) { // ENDED
      handler.recognizer.state = UIGestureRecognizerStateEnded;
    }
  }

  // if the gesture was set to finish, cancel all pointers it was tracking
  if (state == 1 || state == 3 || state == 5) {
    [handler.pointerTracker cancelPointers];
  }

  // do not send state change event when activating because it bypasses
  // shouldRequireFailureOfGestureRecognizer
  if (state != 4) {
    [handler handleGesture:handler.recognizer];
  }
}

#pragma mark-- Batch handling

- (void)addOperationBlock:(GestureHandlerOperation)operation
{
  [_operations addObject:operation];
}

#pragma mark - RCTSurfacePresenterObserver

#ifdef RN_FABRIC_ENABLED

- (void)didMountComponentsWithRootTag:(NSInteger)rootTag
{
  RCTAssertMainQueue();

  if (_operations.count == 0) {
    return;
  }

  NSArray<GestureHandlerOperation> *operations = _operations;
  _operations = [NSMutableArray new];

  for (GestureHandlerOperation operation in operations) {
    operation(self->_manager);
  }
}

#else

#pragma mark - RCTUIManagerObserver

- (void)uiManagerWillFlushUIBlocks:(RCTUIManager *)uiManager
{
  [self uiManagerWillPerformMounting:uiManager];
}

- (void)uiManagerWillPerformMounting:(RCTUIManager *)uiManager
{
  if (_operations.count == 0) {
    return;
  }

  NSArray<GestureHandlerOperation> *operations = _operations;
  _operations = [NSMutableArray new];

  [uiManager addUIBlock:^(__unused RCTUIManager *manager, __unused NSDictionary<NSNumber *, UIView *> *viewRegistry) {
    for (GestureHandlerOperation operation in operations) {
      operation(self->_manager);
    }
  }];
}

#endif // RN_FABRIC_ENABLED

#pragma mark Events

- (NSArray<NSString *> *)supportedEvents
{
  return @[ @"onGestureHandlerEvent", @"onGestureHandlerStateChange" ];
}

#pragma mark Module Constants

- (NSDictionary *)constantsToExport
{
  return @{
    @"State" : @{
      @"UNDETERMINED" : @(RNGestureHandlerStateUndetermined),
      @"BEGAN" : @(RNGestureHandlerStateBegan),
      @"ACTIVE" : @(RNGestureHandlerStateActive),
      @"CANCELLED" : @(RNGestureHandlerStateCancelled),
      @"FAILED" : @(RNGestureHandlerStateFailed),
      @"END" : @(RNGestureHandlerStateEnd)
    },
    @"Direction" : @{
      @"RIGHT" : @(RNGestureHandlerDirectionRight),
      @"LEFT" : @(RNGestureHandlerDirectionLeft),
      @"UP" : @(RNGestureHandlerDirectionUp),
      @"DOWN" : @(RNGestureHandlerDirectionDown)
    }
  };
}

@end