// Copyright 2018 The Fuchsia Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#include "src/ui/examples/simplest_embedder/view.h"

#include <lib/async/cpp/task.h>

#include "src/lib/fxl/logging.h"

namespace simplest_embedder {
using ::fuchsia::ui::input::InputEvent;
using ::fuchsia::ui::input::KeyboardEventPhase;
using ::fuchsia::ui::input::PointerEventPhase;

ShadertoyEmbedderView::ShadertoyEmbedderView(scenic::ViewContext context, async::Loop* message_loop)
    : scenic::BaseView(std::move(context), "simplest_embedder ShadertoyEmbedderView"),
      message_loop_(message_loop),
      background_(session()),
      focused_(false) {
  FXL_CHECK(message_loop_);

  root_node().AddChild(background_);

  scenic::Material background_material(session());
  background_material.SetColor(30, 30, 120, 255);
  background_.SetMaterial(background_material);

  fuchsia::ui::input::SetHardKeyboardDeliveryCmd cmd;
  cmd.delivery_request = true;
  fuchsia::ui::input::Command input_cmd;
  input_cmd.set_set_hard_keyboard_delivery(std::move(cmd));
  session()->Enqueue(std::move(input_cmd));
  // Consider breaking out into a discrete initializer if more work is added.
}

void ShadertoyEmbedderView::LaunchShadertoyClient() {
  FXL_DCHECK(!view_holder_);

  fuchsia::sys::LauncherPtr launcher;
  component_context()->svc()->Connect(launcher.NewRequest());

  embedded_view_info_ = scenic::LaunchComponentAndCreateView(
      launcher, "fuchsia-pkg://fuchsia.com/shadertoy_client#meta/shadertoy_client.cmx");

  view_holder_ = std::make_unique<scenic::ViewHolder>(
      session(), std::move(embedded_view_info_.view_holder_token),
      "shadertoy_client for simplest_embedder");

  root_node().Attach(*(view_holder_.get()));
}

void ShadertoyEmbedderView::OnPropertiesChanged(fuchsia::ui::gfx::ViewProperties old_properties) {
  if (view_holder_) {
    view_holder_->SetViewProperties(view_properties());
  }

  InvalidateScene();
}

void ShadertoyEmbedderView::OnSceneInvalidated(
    fuchsia::images::PresentationInfo presentation_info) {
  if (!has_logical_size()) {
    return;
  }

  const auto size = logical_size();
  const float width = size.x;
  const float height = size.y;

  scenic::RoundedRectangle background_shape(session(), width, height, 20, 20, 80, 10);
  background_.SetShape(background_shape);
  background_.SetTranslation(width / 2.f, height / 2.f, -10.f);
}

// Helper for OnInputEvent: respond to pointer events.
static scenic::Material next_color(scenic::Session* session) {
  static uint8_t red = 128, green = 128, blue = 128;
  scenic::Material material(session);
  material.SetColor(red, green, blue, 255);
  red += 16;
  green += 32;
  blue += 64;
  return material;
}

void ShadertoyEmbedderView::OnInputEvent(fuchsia::ui::input::InputEvent event) {
  switch (event.Which()) {
    case InputEvent::Tag::kFocus: {
      focused_ = event.focus().focused;
      break;
    }
    case InputEvent::Tag::kPointer: {
      const auto& pointer = event.pointer();
      switch (pointer.phase) {
        case PointerEventPhase::DOWN: {
          if (focused_) {
            background_.SetMaterial(next_color(session()));
            InvalidateScene();
          }
          break;
        }
        default:
          break;  // Ignore all other pointer phases.
      }
      break;
    }
    case InputEvent::Tag::kKeyboard: {
      const auto& key = event.keyboard();
      if (key.hid_usage == /* Esc key*/ 0x29 && key.phase == KeyboardEventPhase::RELEASED) {
        async::PostTask(message_loop_->dispatcher(), [this] { message_loop_->Quit(); });
      }
      break;
    }
    case InputEvent::Tag::Invalid: {
      FXL_NOTREACHED();
      break;
    }
  }
}

}  // namespace simplest_embedder