#define _XOPEN_SOURCE 700
#include <math.h>
#ifdef __linux__
#include <linux/input-event-codes.h>
#elif __FreeBSD__
#include <dev/evdev/input-event-codes.h>
#endif
#include <limits.h>
#include <wlr/types/wlr_cursor.h>
#include <wlr/types/wlr_xcursor_manager.h>
#include <wlr/types/wlr_idle.h>
#include "list.h"
#include "log.h"
#include "sway/desktop.h"
#include "sway/desktop/transaction.h"
#include "sway/input/cursor.h"
#include "sway/input/keyboard.h"
#include "sway/layers.h"
#include "sway/output.h"
#include "sway/tree/arrange.h"
#include "sway/tree/view.h"
#include "sway/tree/workspace.h"
#include "wlr-layer-shell-unstable-v1-protocol.h"

static uint32_t get_current_time_msec() {
	struct timespec now;
	clock_gettime(CLOCK_MONOTONIC, &now);
	return now.tv_nsec / 1000;
}

static struct wlr_surface *layer_surface_at(struct sway_output *output,
		struct wl_list *layer, double ox, double oy, double *sx, double *sy) {
	struct sway_layer_surface *sway_layer;
	wl_list_for_each_reverse(sway_layer, layer, link) {
		struct wlr_surface *wlr_surface =
			sway_layer->layer_surface->surface;
		double _sx = ox - sway_layer->geo.x;
		double _sy = oy - sway_layer->geo.y;
		// TODO: Test popups/subsurfaces
		if (wlr_surface_point_accepts_input(wlr_surface, _sx, _sy)) {
			*sx = _sx;
			*sy = _sy;
			return wlr_surface;
		}
	}
	return NULL;
}

/**
 * Returns the container at the cursor's position. If there is a surface at that
 * location, it is stored in **surface (it may not be a view).
 */
static struct sway_container *container_at_coords(
		struct sway_seat *seat, double lx, double ly,
		struct wlr_surface **surface, double *sx, double *sy) {
	// check for unmanaged views first
	struct wl_list *unmanaged = &root_container.sway_root->xwayland_unmanaged;
	struct sway_xwayland_unmanaged *unmanaged_surface;
	wl_list_for_each_reverse(unmanaged_surface, unmanaged, link) {
		struct wlr_xwayland_surface *xsurface =
			unmanaged_surface->wlr_xwayland_surface;

		double _sx = lx - unmanaged_surface->lx;
		double _sy = ly - unmanaged_surface->ly;
		if (wlr_surface_point_accepts_input(xsurface->surface, _sx, _sy)) {
			*surface = xsurface->surface;
			*sx = _sx;
			*sy = _sy;
			return NULL;
		}
	}

	// find the output the cursor is on
	struct wlr_output_layout *output_layout =
		root_container.sway_root->output_layout;
	struct wlr_output *wlr_output = wlr_output_layout_output_at(
			output_layout, lx, ly);
	if (wlr_output == NULL) {
		return NULL;
	}
	struct sway_output *output = wlr_output->data;
	double ox = lx, oy = ly;
	wlr_output_layout_output_coords(output_layout, wlr_output, &ox, &oy);

	// find the focused workspace on the output for this seat
	struct sway_container *ws = seat_get_focus_inactive(seat, output->swayc);
	if (ws && ws->type != C_WORKSPACE) {
		ws = container_parent(ws, C_WORKSPACE);
	}
	if (!ws) {
		return output->swayc;
	}

	if ((*surface = layer_surface_at(output,
				&output->layers[ZWLR_LAYER_SHELL_V1_LAYER_OVERLAY],
				ox, oy, sx, sy))) {
		return ws;
	}
	if (ws->sway_workspace->fullscreen) {
		struct wlr_surface *wlr_surface = ws->sway_workspace->fullscreen->surface;
		if (wlr_surface_point_accepts_input(wlr_surface, ox, oy)) {
			*sx = ox;
			*sy = oy;
			*surface = wlr_surface;
			return ws->sway_workspace->fullscreen->swayc;
		}
		return NULL;
	}
	if ((*surface = layer_surface_at(output,
				&output->layers[ZWLR_LAYER_SHELL_V1_LAYER_TOP],
				ox, oy, sx, sy))) {
		return ws;
	}

	struct sway_container *c;
	if ((c = floating_container_at(lx, ly, surface, sx, sy))) {
		return c;
	}
	if ((c = container_at(ws, lx, ly, surface, sx, sy))) {
		return c;
	}

	if ((*surface = layer_surface_at(output,
				&output->layers[ZWLR_LAYER_SHELL_V1_LAYER_BOTTOM],
				ox, oy, sx, sy))) {
		return ws;
	}
	if ((*surface = layer_surface_at(output,
				&output->layers[ZWLR_LAYER_SHELL_V1_LAYER_BACKGROUND],
				ox, oy, sx, sy))) {
		return ws;
	}

	c = seat_get_active_child(seat, output->swayc);
	if (c) {
		return c;
	}
	if (!c && output->swayc->children->length) {
		c = output->swayc->children->items[0];
		return c;
	}

	return output->swayc;
}

static enum wlr_edges find_resize_edge(struct sway_container *cont,
		struct sway_cursor *cursor) {
	if (cont->type != C_VIEW) {
		return WLR_EDGE_NONE;
	}
	struct sway_view *view = cont->sway_view;
	if (view->border == B_NONE || !view->border_thickness || view->using_csd) {
		return WLR_EDGE_NONE;
	}

	enum wlr_edges edge = 0;
	if (cursor->cursor->x < cont->x + view->border_thickness) {
		edge |= WLR_EDGE_LEFT;
	}
	if (cursor->cursor->y < cont->y + view->border_thickness) {
		edge |= WLR_EDGE_TOP;
	}
	if (cursor->cursor->x >= cont->x + cont->width - view->border_thickness) {
		edge |= WLR_EDGE_RIGHT;
	}
	if (cursor->cursor->y >= cont->y + cont->height - view->border_thickness) {
		edge |= WLR_EDGE_BOTTOM;
	}
	return edge;
}

static void handle_move_motion(struct sway_seat *seat,
		struct sway_cursor *cursor) {
	struct sway_container *con = seat->op_container;
	desktop_damage_whole_container(con);
	container_floating_translate(con,
			cursor->cursor->x - cursor->previous.x,
			cursor->cursor->y - cursor->previous.y);
	desktop_damage_whole_container(con);
}

static void calculate_floating_constraints(struct sway_container *con,
		int *min_width, int *max_width, int *min_height, int *max_height) {
	if (config->floating_minimum_width == -1) { // no minimum
		*min_width = 0;
	} else if (config->floating_minimum_width == 0) { // automatic
		*min_width = 75;
	} else {
		*min_width = config->floating_minimum_width;
	}

	if (config->floating_minimum_height == -1) { // no minimum
		*min_height = 0;
	} else if (config->floating_minimum_height == 0) { // automatic
		*min_height = 50;
	} else {
		*min_height = config->floating_minimum_height;
	}

	if (config->floating_maximum_width == -1) { // no maximum
		*max_width = INT_MAX;
	} else if (config->floating_maximum_width == 0) { // automatic
		struct sway_container *ws = container_parent(con, C_WORKSPACE);
		*max_width = ws->width;
	} else {
		*max_width = config->floating_maximum_width;
	}

	if (config->floating_maximum_height == -1) { // no maximum
		*max_height = INT_MAX;
	} else if (config->floating_maximum_height == 0) { // automatic
		struct sway_container *ws = container_parent(con, C_WORKSPACE);
		*max_height = ws->height;
	} else {
		*max_height = config->floating_maximum_height;
	}
}

static void handle_resize_motion(struct sway_seat *seat,
		struct sway_cursor *cursor) {
	struct sway_container *con = seat->op_container;
	enum wlr_edges edge = seat->op_resize_edge;

	// The amount the mouse has moved since the start of the resize operation
	// Positive is down/right
	double mouse_move_x = cursor->cursor->x - seat->op_ref_lx;
	double mouse_move_y = cursor->cursor->y - seat->op_ref_ly;

	if (edge == WLR_EDGE_TOP || edge == WLR_EDGE_BOTTOM) {
		mouse_move_x = 0;
	}
	if (edge == WLR_EDGE_LEFT || edge == WLR_EDGE_RIGHT) {
		mouse_move_y = 0;
	}

	double grow_width = edge & WLR_EDGE_LEFT ? -mouse_move_x : mouse_move_x;
	double grow_height = edge & WLR_EDGE_TOP ? -mouse_move_y : mouse_move_y;

	if (seat->op_resize_preserve_ratio) {
		double x_multiplier = grow_width / seat->op_ref_width;
		double y_multiplier = grow_height / seat->op_ref_height;
		double max_multiplier = fmax(x_multiplier, y_multiplier);
		grow_width = seat->op_ref_width * max_multiplier;
		grow_height = seat->op_ref_height * max_multiplier;
	}

	// Determine new width/height, and accommodate for floating min/max values
	double width = seat->op_ref_width + grow_width;
	double height = seat->op_ref_height + grow_height;
	int min_width, max_width, min_height, max_height;
	calculate_floating_constraints(con, &min_width, &max_width,
			&min_height, &max_height);
	width = fmax(min_width, fmin(width, max_width));
	height = fmax(min_height, fmin(height, max_height));

	// Apply the view's min/max size
	if (con->type == C_VIEW) {
		double view_min_width, view_max_width, view_min_height, view_max_height;
		view_get_constraints(con->sway_view, &view_min_width, &view_max_width,
				&view_min_height, &view_max_height);
		width = fmax(view_min_width, fmin(width, view_max_width));
		height = fmax(view_min_height, fmin(height, view_max_height));
	}

	// Recalculate these, in case we hit a min/max limit
	grow_width = width - seat->op_ref_width;
	grow_height = height - seat->op_ref_height;

	// Determine grow x/y values - these are relative to the container's x/y at
	// the start of the resize operation.
	double grow_x = 0, grow_y = 0;
	if (edge & WLR_EDGE_LEFT) {
		grow_x = -grow_width;
	} else if (edge & WLR_EDGE_RIGHT) {
		grow_x = 0;
	} else {
		grow_x = -grow_width / 2;
	}
	if (edge & WLR_EDGE_TOP) {
		grow_y = -grow_height;
	} else if (edge & WLR_EDGE_BOTTOM) {
		grow_y = 0;
	} else {
		grow_y = -grow_height / 2;
	}

	// Determine the amounts we need to bump everything relative to the current
	// size.
	int relative_grow_width = width - con->width;
	int relative_grow_height = height - con->height;
	int relative_grow_x = (seat->op_ref_con_lx + grow_x) - con->x;
	int relative_grow_y = (seat->op_ref_con_ly + grow_y) - con->y;

	// Actually resize stuff
	con->x += relative_grow_x;
	con->y += relative_grow_y;
	con->width += relative_grow_width;
	con->height += relative_grow_height;

	if (con->type == C_VIEW) {
		struct sway_view *view = con->sway_view;
		view->x += relative_grow_x;
		view->y += relative_grow_y;
		view->width += relative_grow_width;
		view->height += relative_grow_height;
	}

	arrange_windows(con);
}

void cursor_send_pointer_motion(struct sway_cursor *cursor, uint32_t time_msec,
		bool allow_refocusing) {
	if (time_msec == 0) {
		time_msec = get_current_time_msec();
	}

	struct sway_seat *seat = cursor->seat;

	if (seat->operation != OP_NONE) {
		if (seat->operation == OP_MOVE) {
			handle_move_motion(seat, cursor);
		} else {
			handle_resize_motion(seat, cursor);
		}
		cursor->previous.x = cursor->cursor->x;
		cursor->previous.y = cursor->cursor->y;
		return;
	}

	struct wlr_seat *wlr_seat = seat->wlr_seat;
	struct wlr_surface *surface = NULL;
	double sx, sy;

	// Find the container beneath the pointer's previous position
	struct sway_container *prev_c = container_at_coords(seat,
			cursor->previous.x, cursor->previous.y, &surface, &sx, &sy);
	// Update the stored previous position
	cursor->previous.x = cursor->cursor->x;
	cursor->previous.y = cursor->cursor->y;

	struct sway_container *c = container_at_coords(seat,
			cursor->cursor->x, cursor->cursor->y, &surface, &sx, &sy);
	if (c && config->focus_follows_mouse && allow_refocusing) {
		struct sway_container *focus = seat_get_focus(seat);
		if (focus && c->type == C_WORKSPACE) {
			// Only follow the mouse if it would move to a new output
			// Otherwise we'll focus the workspace, which is probably wrong
			if (focus->type != C_OUTPUT) {
				focus = container_parent(focus, C_OUTPUT);
			}
			struct sway_container *output = c;
			if (output->type != C_OUTPUT) {
				output = container_parent(c, C_OUTPUT);
			}
			if (output != focus) {
				seat_set_focus_warp(seat, c, false);
			}
		} else if (c->type == C_VIEW) {
			// Focus c if the following are true:
			// - cursor is over a new view, i.e. entered a new window; and
			// - the new view is visible, i.e. not hidden in a stack or tab; and
			// - the seat does not have a keyboard grab
			if (!wlr_seat_keyboard_has_grab(cursor->seat->wlr_seat) &&
					c != prev_c &&
					view_is_visible(c->sway_view)) {
				seat_set_focus_warp(seat, c, false);
			} else {
				struct sway_container *next_focus =
					seat_get_focus_inactive(seat, &root_container);
				if (next_focus && next_focus->type == C_VIEW &&
						view_is_visible(next_focus->sway_view)) {
					seat_set_focus_warp(seat, next_focus, false);
				}
			}
		}
	}

	// Handle cursor image
	if (surface) {
		// Reset cursor if switching between clients
		struct wl_client *client = wl_resource_get_client(surface->resource);
		if (client != cursor->image_client) {
			cursor_set_image(cursor, "left_ptr", client);
		}
	} else if (c && container_is_floating(c)) {
		// Try a floating container's resize edge
		enum wlr_edges edge = find_resize_edge(c, cursor);
		const char *image = edge == WLR_EDGE_NONE ?
			"left_ptr" : wlr_xcursor_get_resize_name(edge);
		cursor_set_image(cursor, image, NULL);
	} else {
		cursor_set_image(cursor, "left_ptr", NULL);
	}

	// send pointer enter/leave
	if (surface != NULL) {
		if (seat_is_input_allowed(seat, surface)) {
			wlr_seat_pointer_notify_enter(wlr_seat, surface, sx, sy);
			wlr_seat_pointer_notify_motion(wlr_seat, time_msec, sx, sy);
		}
	} else {
		wlr_seat_pointer_clear_focus(wlr_seat);
	}

	struct wlr_drag_icon *wlr_drag_icon;
	wl_list_for_each(wlr_drag_icon, &wlr_seat->drag_icons, link) {
		struct sway_drag_icon *drag_icon = wlr_drag_icon->data;
		drag_icon_update_position(drag_icon);
	}
}

static void handle_cursor_motion(struct wl_listener *listener, void *data) {
	struct sway_cursor *cursor = wl_container_of(listener, cursor, motion);
	wlr_idle_notify_activity(cursor->seat->input->server->idle, cursor->seat->wlr_seat);
	struct wlr_event_pointer_motion *event = data;
	wlr_cursor_move(cursor->cursor, event->device,
		event->delta_x, event->delta_y);
	cursor_send_pointer_motion(cursor, event->time_msec, true);
	transaction_commit_dirty();
}

static void handle_cursor_motion_absolute(
		struct wl_listener *listener, void *data) {
	struct sway_cursor *cursor =
		wl_container_of(listener, cursor, motion_absolute);
	wlr_idle_notify_activity(cursor->seat->input->server->idle, cursor->seat->wlr_seat);
	struct wlr_event_pointer_motion_absolute *event = data;
	wlr_cursor_warp_absolute(cursor->cursor, event->device, event->x, event->y);
	cursor_send_pointer_motion(cursor, event->time_msec, true);
	transaction_commit_dirty();
}

static void dispatch_cursor_button_floating(struct sway_cursor *cursor,
		uint32_t time_msec, uint32_t button, enum wlr_button_state state,
		struct wlr_surface *surface, double sx, double sy,
		struct sway_container *cont) {
	struct sway_seat *seat = cursor->seat;

	// Deny moving or resizing a fullscreen view
	if (cont->type == C_VIEW && cont->sway_view->is_fullscreen) {
		seat_pointer_notify_button(seat, time_msec, button, state);
		return;
	}

	struct wlr_keyboard *keyboard = wlr_seat_get_keyboard(seat->wlr_seat);
	bool mod_pressed = keyboard &&
		(wlr_keyboard_get_modifiers(keyboard) & config->floating_mod);
	enum wlr_edges edge = find_resize_edge(cont, cursor);
	bool over_title = edge == WLR_EDGE_NONE && !surface;

	// Check for beginning move
	uint32_t btn_move = config->floating_mod_inverse ? BTN_RIGHT : BTN_LEFT;
	if (button == btn_move && state == WLR_BUTTON_PRESSED &&
			(mod_pressed || over_title)) {
		seat_begin_move(seat, cont, button);
		return;
	}

	// Check for beginning resize
	bool resizing_via_border = button == BTN_LEFT && edge != WLR_EDGE_NONE;
	uint32_t btn_resize = config->floating_mod_inverse ? BTN_LEFT : BTN_RIGHT;
	bool resizing_via_mod = button == btn_resize && mod_pressed;
	if ((resizing_via_border || resizing_via_mod) &&
			state == WLR_BUTTON_PRESSED) {
		if (edge == WLR_EDGE_NONE) {
			edge |= cursor->cursor->x > cont->x + cont->width / 2 ?
				WLR_EDGE_RIGHT : WLR_EDGE_LEFT;
			edge |= cursor->cursor->y > cont->y + cont->height / 2 ?
				WLR_EDGE_BOTTOM : WLR_EDGE_TOP;
		}
		seat_begin_resize(seat, cont, button, edge);
		return;
	}

	// Send event to surface
	seat_set_focus(seat, cont);
	seat_pointer_notify_button(seat, time_msec, button, state);
}

/**
 * Remove a button (and duplicates) to the sorted list of currently pressed buttons
 */
static void state_erase_button(struct sway_cursor *cursor, uint32_t button) {
	size_t j = 0;
	for (size_t i = 0; i < cursor->pressed_button_count; ++i) {
		if (i > j) {
			cursor->pressed_buttons[j] = cursor->pressed_buttons[i];
		}
		if (cursor->pressed_buttons[i] != button) {
			++j;
		}
	}
	while (cursor->pressed_button_count > j) {
		--cursor->pressed_button_count;
		cursor->pressed_buttons[cursor->pressed_button_count] = 0;
	}
}

/**
 * Add a button to the sorted list of currently pressed buttons, if there
 * is space.
 */
static void state_add_button(struct sway_cursor *cursor, uint32_t button) {
	if (cursor->pressed_button_count >= SWAY_CURSOR_PRESSED_BUTTONS_CAP) {
		return;
	}
	size_t i = 0;
	while (i < cursor->pressed_button_count && cursor->pressed_buttons[i] < button) {
		++i;
	}
	size_t j = cursor->pressed_button_count;
	while (j > i) {
		cursor->pressed_buttons[j] = cursor->pressed_buttons[j - 1];
		--j;
	}
	cursor->pressed_buttons[i] = button;
	cursor->pressed_button_count++;
}

/**
 * Return the mouse binding which matches modifier, click location, release,
 * and pressed button state, otherwise return null.
 */
static struct sway_binding* get_active_mouse_binding(const struct sway_cursor *cursor,
		list_t *bindings, uint32_t modifiers, bool release, bool on_titlebar,
				     bool on_border, bool on_content) {
	uint32_t click_region = (on_titlebar ? BINDING_TITLEBAR : 0) |
			(on_border ? BINDING_BORDER : 0) |
			(on_content ? BINDING_CONTENTS : 0);

	for (int i = 0; i < bindings->length; ++i) {
		struct sway_binding *binding = bindings->items[i];
		if (modifiers ^ binding->modifiers ||
				cursor->pressed_button_count != (size_t)binding->keys->length ||
				release != (binding->flags & BINDING_RELEASE) ||
				!(click_region & binding->flags)) {
			continue;
		}

		bool match = true;
		for (size_t j = 0; j < cursor->pressed_button_count; j++) {
			uint32_t key = *(uint32_t *)binding->keys->items[j];
			if (key != cursor->pressed_buttons[j]) {
				match = false;
				break;
			}
		}
		if (!match) {
			continue;
		}

		return binding;
	}
	return NULL;
}

void dispatch_cursor_button(struct sway_cursor *cursor,
		uint32_t time_msec, uint32_t button, enum wlr_button_state state) {
	if (cursor->seat->operation != OP_NONE &&
			button == cursor->seat->op_button && state == WLR_BUTTON_RELEASED) {
		seat_end_mouse_operation(cursor->seat);
		seat_pointer_notify_button(cursor->seat, time_msec, button, state);
		return;
	}
	if (time_msec == 0) {
		time_msec = get_current_time_msec();
	}

	struct wlr_surface *surface = NULL;
	double sx, sy;
	struct sway_container *cont = container_at_coords(cursor->seat,
			cursor->cursor->x, cursor->cursor->y, &surface, &sx, &sy);

	// Handle mouse bindings
	bool on_border = cont && (find_resize_edge(cont, cursor) != WLR_EDGE_NONE);
	bool on_contents = !on_border && surface;
	bool on_titlebar = !on_border && !surface;
	struct wlr_keyboard *keyboard = wlr_seat_get_keyboard(cursor->seat->wlr_seat);
	uint32_t modifiers = keyboard ? wlr_keyboard_get_modifiers(keyboard) : 0;

	struct sway_binding *binding = NULL;
	if (state == WLR_BUTTON_PRESSED) {
		state_add_button(cursor, button);
		binding = get_active_mouse_binding(cursor,
			config->current_mode->mouse_bindings, modifiers, false,
			on_titlebar, on_border, on_contents);
	} else {
		binding = get_active_mouse_binding(cursor,
			config->current_mode->mouse_bindings, modifiers, true,
			on_titlebar, on_border, on_contents);
		state_erase_button(cursor, button);
	}
	if (binding) {
		seat_execute_command(cursor->seat, binding);
		// TODO: do we want to pass on the event?
	}

	if (surface && wlr_surface_is_layer_surface(surface)) {
		struct wlr_layer_surface *layer =
			wlr_layer_surface_from_wlr_surface(surface);
		if (layer->current.keyboard_interactive) {
			seat_set_focus_layer(cursor->seat, layer);
		}
		seat_pointer_notify_button(cursor->seat, time_msec, button, state);
	} else if (cont && container_is_floating(cont)) {
		dispatch_cursor_button_floating(cursor, time_msec, button, state,
				surface, sx, sy, cont);
	} else if (surface && cont && cont->type != C_VIEW) {
		// Avoid moving keyboard focus from a surface that accepts it to one
		// that does not unless the change would move us to a new workspace.
		//
		// This prevents, for example, losing focus when clicking on swaybar.
		struct sway_container *new_ws = cont;
		if (new_ws && new_ws->type != C_WORKSPACE) {
			new_ws = container_parent(new_ws, C_WORKSPACE);
		}
		struct sway_container *old_ws = seat_get_focus(cursor->seat);
		if (old_ws && old_ws->type != C_WORKSPACE) {
			old_ws = container_parent(old_ws, C_WORKSPACE);
		}
		if (new_ws != old_ws) {
			seat_set_focus(cursor->seat, cont);
		}
		seat_pointer_notify_button(cursor->seat, time_msec, button, state);
	} else if (cont) {
		seat_set_focus(cursor->seat, cont);
		seat_pointer_notify_button(cursor->seat, time_msec, button, state);
	} else {
		seat_pointer_notify_button(cursor->seat, time_msec, button, state);
	}

	transaction_commit_dirty();
}

static void handle_cursor_button(struct wl_listener *listener, void *data) {
	struct sway_cursor *cursor = wl_container_of(listener, cursor, button);
	wlr_idle_notify_activity(cursor->seat->input->server->idle, cursor->seat->wlr_seat);
	struct wlr_event_pointer_button *event = data;
	dispatch_cursor_button(cursor,
			event->time_msec, event->button, event->state);
}

static void handle_cursor_axis(struct wl_listener *listener, void *data) {
	struct sway_cursor *cursor = wl_container_of(listener, cursor, axis);
	wlr_idle_notify_activity(cursor->seat->input->server->idle, cursor->seat->wlr_seat);
	struct wlr_event_pointer_axis *event = data;
	wlr_seat_pointer_notify_axis(cursor->seat->wlr_seat, event->time_msec,
		event->orientation, event->delta, event->delta_discrete, event->source);
}

static void handle_touch_down(struct wl_listener *listener, void *data) {
	struct sway_cursor *cursor = wl_container_of(listener, cursor, touch_down);
	wlr_idle_notify_activity(cursor->seat->input->server->idle, cursor->seat->wlr_seat);
	struct wlr_event_touch_down *event = data;

	struct sway_seat *seat = cursor->seat;
	struct wlr_seat *wlr_seat = seat->wlr_seat;
	struct wlr_surface *surface = NULL;

	double lx, ly;
	wlr_cursor_absolute_to_layout_coords(cursor->cursor, event->device,
			event->x, event->y, &lx, &ly);
	double sx, sy;
	container_at_coords(seat, lx, ly, &surface, &sx, &sy);

	seat->touch_id = event->touch_id;
	seat->touch_x = lx;
	seat->touch_y = ly;

	if (!surface) {
		return;
	}

	// TODO: fall back to cursor simulation if client has not bound to touch
	if (seat_is_input_allowed(seat, surface)) {
		wlr_seat_touch_notify_down(wlr_seat, surface, event->time_msec,
				event->touch_id, sx, sy);
		cursor->image_client = NULL;
		wlr_cursor_set_image(cursor->cursor, NULL, 0, 0, 0, 0, 0, 0);
	}
}

static void handle_touch_up(struct wl_listener *listener, void *data) {
	struct sway_cursor *cursor = wl_container_of(listener, cursor, touch_up);
	wlr_idle_notify_activity(cursor->seat->input->server->idle, cursor->seat->wlr_seat);
	struct wlr_event_touch_up *event = data;
	struct wlr_seat *seat = cursor->seat->wlr_seat;
	// TODO: fall back to cursor simulation if client has not bound to touch
	wlr_seat_touch_notify_up(seat, event->time_msec, event->touch_id);
}

static void handle_touch_motion(struct wl_listener *listener, void *data) {
	struct sway_cursor *cursor =
		wl_container_of(listener, cursor, touch_motion);
	wlr_idle_notify_activity(cursor->seat->input->server->idle, cursor->seat->wlr_seat);
	struct wlr_event_touch_motion *event = data;

	struct sway_seat *seat = cursor->seat;
	struct wlr_seat *wlr_seat = seat->wlr_seat;
	struct wlr_surface *surface = NULL;

	double lx, ly;
	wlr_cursor_absolute_to_layout_coords(cursor->cursor, event->device,
			event->x, event->y, &lx, &ly);
	double sx, sy;
	container_at_coords(cursor->seat, lx, ly, &surface, &sx, &sy);

	if (seat->touch_id == event->touch_id) {
		seat->touch_x = lx;
		seat->touch_y = ly;

		struct wlr_drag_icon *wlr_drag_icon;
		wl_list_for_each(wlr_drag_icon, &wlr_seat->drag_icons, link) {
			struct sway_drag_icon *drag_icon = wlr_drag_icon->data;
			drag_icon_update_position(drag_icon);
		}
	}

	if (!surface) {
		return;
	}

	// TODO: fall back to cursor simulation if client has not bound to touch
	if (seat_is_input_allowed(cursor->seat, surface)) {
		wlr_seat_touch_notify_motion(wlr_seat, event->time_msec,
			event->touch_id, sx, sy);
	}
}

static double apply_mapping_from_coord(double low, double high, double value) {
	if (isnan(value)) {
		return value;
	}

	return (value - low) / (high - low);
}

static void apply_mapping_from_region(struct wlr_input_device *device,
		struct input_config_mapped_from_region *region, double *x, double *y) {
	double x1 = region->x1, x2 = region->x2;
	double y1 = region->y1, y2 = region->y2;

	if (region->mm) {
		if (device->width_mm == 0 || device->height_mm == 0) {
			return;
		}
		x1 /= device->width_mm;
		x2 /= device->width_mm;
		y1 /= device->height_mm;
		y2 /= device->height_mm;
	}

	*x = apply_mapping_from_coord(x1, x2, *x);
	*y = apply_mapping_from_coord(y1, y2, *y);
}

static void handle_tool_axis(struct wl_listener *listener, void *data) {
	struct sway_cursor *cursor = wl_container_of(listener, cursor, tool_axis);
	wlr_idle_notify_activity(cursor->seat->input->server->idle, cursor->seat->wlr_seat);
	struct wlr_event_tablet_tool_axis *event = data;
	struct sway_input_device *input_device = event->device->data;

	double x = NAN, y = NAN;
	if ((event->updated_axes & WLR_TABLET_TOOL_AXIS_X)) {
		x = event->x;
	}
	if ((event->updated_axes & WLR_TABLET_TOOL_AXIS_Y)) {
		y = event->y;
	}

	struct input_config *ic = input_device_get_config(input_device);
	if (ic != NULL && ic->mapped_from_region != NULL) {
		apply_mapping_from_region(event->device, ic->mapped_from_region, &x, &y);
	}

	wlr_cursor_warp_absolute(cursor->cursor, event->device, x, y);
	cursor_send_pointer_motion(cursor, event->time_msec, true);
	transaction_commit_dirty();
}

static void handle_tool_tip(struct wl_listener *listener, void *data) {
	struct sway_cursor *cursor = wl_container_of(listener, cursor, tool_tip);
	wlr_idle_notify_activity(cursor->seat->input->server->idle, cursor->seat->wlr_seat);
	struct wlr_event_tablet_tool_tip *event = data;
	dispatch_cursor_button(cursor, event->time_msec,
			BTN_LEFT, event->state == WLR_TABLET_TOOL_TIP_DOWN ?
				WLR_BUTTON_PRESSED : WLR_BUTTON_RELEASED);
}

static void handle_tool_button(struct wl_listener *listener, void *data) {
	struct sway_cursor *cursor = wl_container_of(listener, cursor, tool_button);
	wlr_idle_notify_activity(cursor->seat->input->server->idle, cursor->seat->wlr_seat);
	struct wlr_event_tablet_tool_button *event = data;
	// TODO: the user may want to configure which tool buttons are mapped to
	// which simulated pointer buttons
	switch (event->state) {
	case WLR_BUTTON_PRESSED:
		if (cursor->tool_buttons == 0) {
			dispatch_cursor_button(cursor,
					event->time_msec, BTN_RIGHT, event->state);
		}
		cursor->tool_buttons++;
		break;
	case WLR_BUTTON_RELEASED:
		if (cursor->tool_buttons == 1) {
			dispatch_cursor_button(cursor,
					event->time_msec, BTN_RIGHT, event->state);
		}
		cursor->tool_buttons--;
		break;
	}
}

static void handle_request_set_cursor(struct wl_listener *listener,
		void *data) {
	struct sway_cursor *cursor =
		wl_container_of(listener, cursor, request_set_cursor);
	if (cursor->seat->operation != OP_NONE) {
		return;
	}
	struct wlr_seat_pointer_request_set_cursor_event *event = data;

	struct wl_client *focused_client = NULL;
	struct wlr_surface *focused_surface =
		cursor->seat->wlr_seat->pointer_state.focused_surface;
	if (focused_surface != NULL) {
		focused_client = wl_resource_get_client(focused_surface->resource);
	}

	// TODO: check cursor mode
	if (focused_client == NULL ||
			event->seat_client->client != focused_client) {
		wlr_log(WLR_DEBUG, "denying request to set cursor from unfocused client");
		return;
	}

	wlr_cursor_set_surface(cursor->cursor, event->surface, event->hotspot_x,
		event->hotspot_y);
	cursor->image = NULL;
	cursor->image_client = focused_client;
}

void cursor_set_image(struct sway_cursor *cursor, const char *image,
		struct wl_client *client) {
	if (!cursor->image || strcmp(cursor->image, image) != 0) {
		wlr_xcursor_manager_set_cursor_image(cursor->xcursor_manager, image,
				cursor->cursor);
		cursor->image = image;
	}
	cursor->image_client = client;
}

void sway_cursor_destroy(struct sway_cursor *cursor) {
	if (!cursor) {
		return;
	}

	wlr_xcursor_manager_destroy(cursor->xcursor_manager);
	wlr_cursor_destroy(cursor->cursor);
	free(cursor);
}

struct sway_cursor *sway_cursor_create(struct sway_seat *seat) {
	struct sway_cursor *cursor = calloc(1, sizeof(struct sway_cursor));
	if (!sway_assert(cursor, "could not allocate sway cursor")) {
		return NULL;
	}

	struct wlr_cursor *wlr_cursor = wlr_cursor_create();
	if (!sway_assert(wlr_cursor, "could not allocate wlr cursor")) {
		free(cursor);
		return NULL;
	}

	cursor->previous.x = wlr_cursor->x;
	cursor->previous.y = wlr_cursor->y;

	cursor->seat = seat;
	wlr_cursor_attach_output_layout(wlr_cursor,
		root_container.sway_root->output_layout);

	// input events
	wl_signal_add(&wlr_cursor->events.motion, &cursor->motion);
	cursor->motion.notify = handle_cursor_motion;

	wl_signal_add(&wlr_cursor->events.motion_absolute,
		&cursor->motion_absolute);
	cursor->motion_absolute.notify = handle_cursor_motion_absolute;

	wl_signal_add(&wlr_cursor->events.button, &cursor->button);
	cursor->button.notify = handle_cursor_button;

	wl_signal_add(&wlr_cursor->events.axis, &cursor->axis);
	cursor->axis.notify = handle_cursor_axis;

	wl_signal_add(&wlr_cursor->events.touch_down, &cursor->touch_down);
	cursor->touch_down.notify = handle_touch_down;

	wl_signal_add(&wlr_cursor->events.touch_up, &cursor->touch_up);
	cursor->touch_up.notify = handle_touch_up;

	wl_signal_add(&wlr_cursor->events.touch_motion,
		&cursor->touch_motion);
	cursor->touch_motion.notify = handle_touch_motion;

	// TODO: tablet protocol support
	// Note: We should emulate pointer events for clients that don't support the
	// tablet protocol when the time comes
	wl_signal_add(&wlr_cursor->events.tablet_tool_axis,
		&cursor->tool_axis);
	cursor->tool_axis.notify = handle_tool_axis;

	wl_signal_add(&wlr_cursor->events.tablet_tool_tip, &cursor->tool_tip);
	cursor->tool_tip.notify = handle_tool_tip;

	wl_signal_add(&wlr_cursor->events.tablet_tool_button, &cursor->tool_button);
	cursor->tool_button.notify = handle_tool_button;

	wl_signal_add(&seat->wlr_seat->events.request_set_cursor,
			&cursor->request_set_cursor);
	cursor->request_set_cursor.notify = handle_request_set_cursor;

	cursor->cursor = wlr_cursor;

	return cursor;
}