#pragma once

#include <stdbool.h>
#include <stddef.h>
#include <stdint.h>

typedef struct Xorg_Viewer Xorg_Viewer;

/*
 * How the frame is scaled to fit the window.
 * SCALE_STRETCH is the only implemented mode; others are reserved.
 */
typedef enum Xorg_Scale {
	XORG_SCALE_STRETCH,  /* fill window, ignore aspect ratio (default) */
	XORG_SCALE_FIT,      /* largest rect that fits, preserve aspect, black bars */
	XORG_SCALE_FILL,     /* smallest rect that covers, preserve aspect, crop edges */
	XORG_SCALE_1_1,      /* native pixel size, no scaling */
} Xorg_Scale;

/*
 * Where the frame is positioned within the window.
 * Used with XORG_SCALE_FIT, XORG_SCALE_FILL, and XORG_SCALE_1_1.
 */
typedef enum Xorg_Anchor {
	XORG_ANCHOR_CENTER,    /* center frame in window (default) */
	XORG_ANCHOR_TOP_LEFT,  /* align frame to top-left corner */
} Xorg_Anchor;

/* Returns false when compiled without HAVE_GLFW. */
bool xorg_available(void);

/*
 * Open a viewer window at screen position (x, y) with the given size.
 * Returns NULL if xorg is unavailable or if window/context creation fails.
 */
Xorg_Viewer *xorg_viewer_open(int x, int y, int width, int height,
                               const char *title);

/* Push a YUV 4:2:0 planar frame for immediate display. */
bool xorg_viewer_push_yuv420(Xorg_Viewer *v,
                              const uint8_t *y, const uint8_t *cb, const uint8_t *cr,
                              int width, int height);

/* Push a packed BGRA frame for immediate display. */
bool xorg_viewer_push_bgra(Xorg_Viewer *v,
                            const uint8_t *data, int width, int height);

/*
 * Push a MJPEG frame.  Decoded via libjpeg-turbo to planar YUV before upload.
 * Returns false if compiled without HAVE_TURBOJPEG.
 */
bool xorg_viewer_push_mjpeg(Xorg_Viewer *v,
                             const uint8_t *data, size_t size);

/* Change scale/anchor at any time; takes effect on the next render. */
void xorg_viewer_set_scale(Xorg_Viewer *v, Xorg_Scale scale);
void xorg_viewer_set_anchor(Xorg_Viewer *v, Xorg_Anchor anchor);

/*
 * Process pending window events.
 * Returns false when the user has closed the window.
 * Must be called from the thread that created the viewer.
 */
bool xorg_viewer_poll(Xorg_Viewer *v);

void xorg_viewer_close(Xorg_Viewer *v);