#pragma once

#include <cstdint>
#include <deque>
#include <string>

#include "event.h"

namespace roro {

struct Toast {
    std::string text;
    NotificationLevel level;
    uint32_t id;  // unique per push, to tell two identical Toasts apart
};

// Notifications waiting to be shown as Toasts, one at a time, each for the same duration.
class ToastQueue {
   public:
    explicit ToastQueue(uint32_t durationMs, size_t capacity = 4) : durationMs_(durationMs), capacity_(capacity) {}

    void push(const std::string& text, NotificationLevel level, uint32_t nowMs);

    // The Toast to show now, or nullptr. Advances the queue as Toasts expire.
    const Toast* current(uint32_t nowMs);
    void dismiss(uint32_t nowMs);

    // True once after the visible Toast changed (appeared, switched or disappeared).
    bool takeChanged();

   private:
    uint32_t durationMs_;
    size_t capacity_;
    std::deque<Toast> queue_;
    bool showing_ = false;
    uint32_t shownAtMs_ = 0;
    bool changed_ = false;
    uint32_t nextId_ = 1;
};

}  // namespace roro