/*
 * LVGL Window Close Bug Demonstration
 *
 * This program demonstrates that calling lv_opengles_window_delete() on the last
 * window causes the program to SEGFAULT, making it impossible to programmatically
 * close windows without terminating the entire application.
 *
 * Expected behavior: Window should close and program should continue running.
 * Actual behavior: Program crashes/hangs in an infinite loop when the last window
 *                 is deleted, because lv_opengles_window_delete() calls
 *                 lv_glfw_window_quit() which SEGFAULTs before attempting to call exit(0).
 *
 * Root cause: In lv_opengles_glfw.c:
 *   - Line 189-190: When window list becomes empty, calls lv_glfw_window_quit()
 *   - Line 436-446: lv_glfw_window_quit() calls glfwTerminate(), lv_deinit(),
 *                   and exit(0)
 *
 * Build manually:
 *   g++ -std=c++17 lvgl_window_close_bug.cpp \
 *       -I../lvgl \
 *       -Lbuild/lvgl/lib \
 *       -llvgl -lglfw -lGL -lGLEW -lfreetype -lpng -lpthread \
 *       -o lvgl_window_close_bug
 */

#include <stdio.h>
#include <unistd.h>
#include <GLFW/glfw3.h>
#include <lvgl.h>

int main() {
    printf("=== LVGL Window Close Bug Demonstration ===\n\n");

    // Initialize GLFW
    printf("1. Initializing GLFW...\n");
    if (!glfwInit()) {
        fprintf(stderr, "Failed to initialize GLFW\n");
        return 1;
    }
    printf("   GLFW initialized successfully\n\n");

    // Set up OpenGL ES context hints
    glfwWindowHint(GLFW_CLIENT_API, GLFW_OPENGL_ES_API);
    glfwWindowHint(GLFW_CONTEXT_VERSION_MAJOR, 3);
    glfwWindowHint(GLFW_CONTEXT_VERSION_MINOR, 1);
    glfwWindowHint(GLFW_RESIZABLE, GLFW_FALSE);

    // Initialize LVGL
    printf("2. Initializing LVGL...\n");
    lv_init();
    printf("   LVGL initialized successfully\n\n");

    // Create LVGL window
    printf("3. Creating LVGL window (640x480)...\n");
    lv_opengles_window_t* lv_window = lv_opengles_glfw_window_create(640, 480, true);
    if (!lv_window) {
        fprintf(stderr, "Failed to create LVGL window\n");
        return 1;
    }
    printf("   LVGL window created at %p\n\n", (void*)lv_window);

    // Create display texture
    printf("4. Creating display texture...\n");
    lv_display_t* lv_display = lv_opengles_texture_create(640, 480);
    if (!lv_display) {
        fprintf(stderr, "Failed to create display texture\n");
        lv_opengles_window_delete(lv_window);
        return 1;
    }
    printf("   Display texture created at %p\n\n", (void*)lv_display);

    // Add texture to window
    printf("5. Adding texture to window...\n");
    int32_t texture_id = lv_opengles_texture_get_texture_id(lv_display);
    lv_opengles_window_texture_t* window_texture = lv_opengles_window_add_texture(
        lv_window, texture_id, 640, 480
    );
    if (!window_texture) {
        fprintf(stderr, "Failed to add texture to window\n");
        lv_display_delete(lv_display);
        lv_opengles_window_delete(lv_window);
        return 1;
    }
    printf("   Window texture created at %p\n", (void*)window_texture);
    printf("   Texture ID: %d\n\n", texture_id);

    // Wait a bit to show the window
    printf("6. Window created and displayed. Waiting 2 seconds...\n");
    sleep(2);
    printf("   Done waiting\n\n");

    // Now close the window programmatically
    printf("7. Attempting to close window programmatically...\n");
    printf("   Step 7a: Removing window texture...\n");
    lv_opengles_window_texture_remove(window_texture);
    printf("   Step 7a: ✓ Texture removed successfully\n\n");

    printf("   Step 7b: Deleting display...\n");
    lv_display_delete(lv_display);
    printf("   Step 7b: ✓ Display deleted successfully\n\n");

    printf("   Step 7c: Deleting LVGL window...\n");
    printf("   WARNING: This will SEGFAULT if it's the last window!\n");
    printf("   About to call lv_opengles_window_delete()...\n");
    fflush(stdout);

    lv_opengles_window_delete(lv_window);

    // This line will NEVER be reached because lv_opengles_window_delete() causes infinite recursion
    //  (I think it calls lvgl_deinit and then tries to use log causing an error it tried to log)
    printf("   Step 7c: ✓ Window deleted successfully\n\n");

    printf("8. Cleaning up...\n");
    printf("   This code should be reachable, but it won't be SEGFAULT\n");
    glfwTerminate();

    printf("\n=== Test completed successfully ===\n");
    printf("If you see this message, the bug has been fixed!\n");

    return 0;
}