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#include <stdio.h>
#include <stdlib.h>
#include <pthread.h>
#include <unistd.h>
#include <stdbool.h>

// A thread-safe queue for inter-thread communication
typedef struct {
    int data[100];         // Fixed-size buffer for storing data items
    int head;              // Index of the front element to be dequeued
    int tail;              // Index of the next position to enqueue
    int count;             // Current number of elements in the queue
    pthread_mutex_t lock;  // Mutex to synchronize access to the queue
    pthread_cond_t cond;   // Condition variable for signaling availability of data
} ThreadSafeQueue;

// OverlayProvider is responsible for managing the overlay rendering system
typedef struct {
    ThreadSafeQueue queue; // Queue for passing messages/tasks to the worker thread
    pthread_t thread;      // Worker thread for handling overlay operations
    bool stop_signal;      // Signal to indicate when the worker thread should stop

    // Methods for managing the overlay provider
    void (*init)();        // Initialize the OverlayProvider
    void (*start)();       // Start the overlay worker thread
    void (*stop)();        // Stop the overlay worker thread
    void (*push)(int value); // Push a task/message to the queue

    // TODO:
    // Add bounding box map here for storing and managing overlay bounding boxes
    // Add Axoverlay-specific features or settings here for customization
} OverlayProvider;

// Global instance of OverlayProvider
OverlayProvider overlayProvider;

// Function to initialize the queue
void queue_init(ThreadSafeQueue* queue) {
    queue->head = 0;
    queue->tail = 0;
    queue->count = 0;
    pthread_mutex_init(&queue->lock, NULL);
    pthread_cond_init(&queue->cond, NULL);

    // TODO: Initialize bounding box map and Axoverlay-specific settings
}

// Push data to the queue
void push_to_queue(ThreadSafeQueue* queue, int value) {
    pthread_mutex_lock(&queue->lock);
    while (queue->count == 100) { // Wait if the buffer is full
        pthread_cond_wait(&queue->cond, &queue->lock);
    }
    queue->data[queue->tail] = value;
    queue->tail = (queue->tail + 1) % 100;
    queue->count++;
    pthread_cond_signal(&queue->cond);
    pthread_mutex_unlock(&queue->lock);
}

// Pull data from the queue
int pull_from_queue(ThreadSafeQueue* queue, bool* success) {
    pthread_mutex_lock(&queue->lock);
    while (queue->count == 0) { // Wait if the buffer is empty
        pthread_cond_wait(&queue->cond, &queue->lock);
    }
    int value = queue->data[queue->head];
    queue->head = (queue->head + 1) % 100;
    queue->count--;
    pthread_cond_signal(&queue->cond);
    *success = true;
    pthread_mutex_unlock(&queue->lock);
    return value;
}

// Worker thread function for OverlayProvider
void* overlay_worker(void* args) {
    while (!overlayProvider.stop_signal) {
        bool success = false;
        int value = pull_from_queue(&overlayProvider.queue, &success);

        if (success) {
            // TODO: Perform overlay operations such as rendering bounding boxes
            printf("OverlayProvider processing value: %d\n", value);
        }
    }

    printf("OverlayProvider stopping.\n");
    return NULL;
}

// Initialize the OverlayProvider
void overlay_init() {
    overlayProvider.stop_signal = false;
    queue_init(&overlayProvider.queue);
}

// Start the overlay worker thread
void overlay_start() {
    pthread_create(&overlayProvider.thread, NULL, overlay_worker, NULL);
}

// Stop the overlay worker thread
void overlay_stop() {
    overlayProvider.stop_signal = true;
    pthread_cond_broadcast(&overlayProvider.queue.cond); // Wake up thread if waiting
    pthread_join(overlayProvider.thread, NULL);
    printf("OverlayProvider has stopped.\n");
}

// Push a value to the overlay worker thread
void overlay_push_to_queue(int value) {
    push_to_queue(&overlayProvider.queue, value);
}

// Constructor-like function to initialize OverlayProvider with methods
OverlayProvider create_overlay_provider() {
    OverlayProvider provider = {
        .init = overlay_init,
        .start = overlay_start,
        .stop = overlay_stop,
        .push = overlay_push_to_queue,
    };
    return provider;
}

// Demonstrating the use of OverlayProvider
int main() {
    // Create and initialize the OverlayProvider
    overlayProvider = create_overlay_provider();
    overlayProvider.init();
    overlayProvider.start();

    // Send tasks/messages to the overlay provider
    for (int i = 0; i < 10; ++i) {
        overlayProvider.push(i);
        usleep(100000); // Simulate delay
    }

    overlayProvider.stop();

    printf("All workers have stopped. Exiting program.\n");
    return 0;
}