#include "labwc.h"

static void server_new_pointer(struct server *server,
			       struct wlr_input_device *device)
{
	/* TODO: Configure libinput on device to set tap, acceleration, etc */
	wlr_cursor_attach_input_device(server->cursor, device);
}

void server_new_input(struct wl_listener *listener, void *data)
{
	/*
	 * This event is raised by the backend when a new input device becomes
	 * available.
	 */
	struct server *server = wl_container_of(listener, server, new_input);
	struct wlr_input_device *device = data;
	switch (device->type) {
	case WLR_INPUT_DEVICE_KEYBOARD:
		keyboard_new(server, device);
		break;
	case WLR_INPUT_DEVICE_POINTER:
		server_new_pointer(server, device);
		break;
	default:
		break;
	}

	/*
	 * We need to let the wlr_seat know what our capabilities are, which is
	 * communiciated to the client.
	 */
	uint32_t caps = WL_SEAT_CAPABILITY_POINTER;
	if (!wl_list_empty(&server->keyboards)) {
		caps |= WL_SEAT_CAPABILITY_KEYBOARD;
	}
	wlr_seat_set_capabilities(server->seat, caps);
}

void seat_request_cursor(struct wl_listener *listener, void *data)
{
	struct server *server =
		wl_container_of(listener, server, request_cursor);
	/*
	 * This event is rasied by the seat when a client provides a cursor
	 * image
	 */
	struct wlr_seat_pointer_request_set_cursor_event *event = data;
	struct wlr_seat_client *focused_client =
		server->seat->pointer_state.focused_client;

	/* This can be sent by any client, so we check to make sure this one is
	 * actually has pointer focus first. */
	if (focused_client == event->seat_client) {
		/* Once we've vetted the client, we can tell the cursor to use
		 * the provided surface as the cursor image. It will set the
		 * hardware cursor on the output that it's currently on and
		 * continue to do so as the cursor moves between outputs. */
		wlr_cursor_set_surface(server->cursor, event->surface,
				       event->hotspot_x, event->hotspot_y);
	}
}

void seat_request_set_selection(struct wl_listener *listener, void *data)
{
	struct server *server =
		wl_container_of(listener, server, request_set_selection);
	struct wlr_seat_request_set_selection_event *event = data;
	wlr_seat_set_selection(server->seat, event->source, event->serial);
}

void server_new_output(struct wl_listener *listener, void *data)
{
	/* This event is rasied by the backend when a new output (aka a display
	 * or monitor) becomes available. */
	struct server *server = wl_container_of(listener, server, new_output);
	struct wlr_output *wlr_output = data;

	/*
	 * Some backends don't have modes. DRM+KMS does, and we need to set a
	 * mode before we can use the output. The mode is a tuple of (width,
	 * height, refresh rate), and each monitor supports only a specific set
	 * of modes. We just pick the monitor's preferred mode.
	 * TODO: support user configuration
	 */
	if (!wl_list_empty(&wlr_output->modes)) {
		struct wlr_output_mode *mode =
			wlr_output_preferred_mode(wlr_output);
		wlr_output_set_mode(wlr_output, mode);
		wlr_output_enable(wlr_output, true);
		if (!wlr_output_commit(wlr_output)) {
			return;
		}
	}

	/* Allocates and configures our state for this output */
	struct output *output = calloc(1, sizeof(struct output));
	output->wlr_output = wlr_output;
	output->server = server;
	/* Sets up a listener for the frame notify event. */
	output->frame.notify = output_frame;
	wl_signal_add(&wlr_output->events.frame, &output->frame);
	wl_list_insert(&server->outputs, &output->link);

	/* Adds this to the output layout. The add_auto function arranges
	 * outputs from left-to-right in the order they appear. A more
	 * sophisticated compositor would let the user configure the arrangement
	 * of outputs in the layout.
	 *
	 * The output layout utility automatically adds a wl_output global to
	 * the display, which Wayland clients can see to find out information
	 * about the output (such as DPI, scale factor, manufacturer, etc).
	 */
	wlr_output_layout_add_auto(server->output_layout, wlr_output);
}