[core] Update Entities (#6885)

esphome/components/update/update_entity.h

@@ -0,0 +1,51 @@
+#pragma once
+
+#include "esphome/core/automation.h"
+#include "esphome/core/component.h"
+#include "esphome/core/entity_base.h"
+
+namespace esphome {
+namespace update {
+
+struct UpdateInfo {
+  std::string latest_version;
+  std::string current_version;
+  std::string title;
+  std::string summary;
+  std::string release_url;
+  std::string firmware_url;
+  std::string md5;
+  bool has_progress{false};
+  float progress;
+};
+
+enum UpdateState : uint8_t {
+  UPDATE_STATE_UNKNOWN,
+  UPDATE_STATE_NO_UPDATE,
+  UPDATE_STATE_AVAILABLE,
+  UPDATE_STATE_INSTALLING,
+};
+
+class UpdateEntity : public EntityBase, public EntityBase_DeviceClass {
+ public:
+  bool has_state() const { return this->has_state_; }
+
+  void publish_state();
+
+  virtual void perform() = 0;
+
+  const UpdateInfo &update_info = update_info_;
+  const UpdateState &state = state_;
+
+  void add_on_state_callback(std::function<void()> &&callback) { this->state_callback_.add(std::move(callback)); }
+
+ protected:
+  UpdateState state_{UPDATE_STATE_UNKNOWN};
+  UpdateInfo update_info_;
+  bool has_state_{false};
+
+  CallbackManager<void()> state_callback_{};
+};
+
+}  // namespace update
+}  // namespace esphome