#pragma once

#include <cstdint>
#include <exception>

namespace mbgl {

class RendererObserver {
public:
    virtual ~RendererObserver() = default;

    enum class RenderMode : uint32_t {
        Partial,
        Full
    };

    // Signals that a repaint is required
    virtual void onInvalidate() {}

    // Resource failed to download / parse
    virtual void onResourceError(std::exception_ptr) {}

    // First frame
    virtual void onWillStartRenderingMap() {}

    // Start of frame, initial is the first frame for this map
    virtual void onWillStartRenderingFrame() {}

    // End of frame, booleans flags that a repaint is required and that placement changed.
    virtual void onDidFinishRenderingFrame(RenderMode, bool /*repaint*/, bool /*placementChanged*/) {}

    // Final frame
    virtual void onDidFinishRenderingMap() {}

    // Style is missing an image
    using StyleImageMissingCallback = std::function<void()>;
    virtual void onStyleImageMissing(const std::string&, StyleImageMissingCallback done) { done(); }
    virtual void onRemoveUnusedStyleImages(const std::vector<std::string>&) {}
};

} // namespace mbgl