/*
 * Copyright © 2012 Philipp Brüschweiler
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the "Software"),
 * to deal in the Software without restriction, including without limitation
 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
 * and/or sell copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice (including the next
 * paragraph) shall be included in all copies or substantial portions of the
 * Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
 * DEALINGS IN THE SOFTWARE.
 */

#include "config.h"

#include <errno.h>
#include <stdbool.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include <assert.h>
#include <ctype.h>

#include <wayland-client.h>

#include "shared/helpers.h"
#include "shared/os-compatibility.h"
#include "shared/xalloc.h"
#include "shared/zalloc.h"
#include "presentation-time-client-protocol.h"

typedef void (*print_info_t)(void *info);
typedef void (*destroy_info_t)(void *info);

struct global_info {
	struct wl_list link;

	uint32_t id;
	uint32_t version;
	char *interface;

	print_info_t print;
	destroy_info_t destroy;
};

struct output_mode {
	struct wl_list link;

	uint32_t flags;
	int32_t width, height;
	int32_t refresh;
};

struct output_info {
	struct global_info global;

	struct wl_output *output;

	int32_t version;

	struct {
		int32_t x, y;
		int32_t scale;
		int32_t physical_width, physical_height;
		enum wl_output_subpixel subpixel;
		enum wl_output_transform output_transform;
		char *make;
		char *model;
	} geometry;

	struct wl_list modes;
};

struct shm_format {
	struct wl_list link;

	uint32_t format;
};

struct shm_info {
	struct global_info global;
	struct wl_shm *shm;

	struct wl_list formats;
};

struct seat_info {
	struct global_info global;
	struct wl_seat *seat;
	struct weston_info *info;

	uint32_t capabilities;
	char *name;

	int32_t repeat_rate;
	int32_t repeat_delay;
};

struct presentation_info {
	struct global_info global;
	struct wp_presentation *presentation;

	clockid_t clk_id;
};

struct weston_info {
	struct wl_display *display;
	struct wl_registry *registry;

	struct wl_list infos;
	bool roundtrip_needed;
};

static void
print_global_info(void *data)
{
	struct global_info *global = data;

	printf("interface: '%s', version: %u, name: %u\n",
	       global->interface, global->version, global->id);
}

static void
init_global_info(struct weston_info *info,
		 struct global_info *global, uint32_t id,
		 const char *interface, uint32_t version)
{
	global->id = id;
	global->version = version;
	global->interface = xstrdup(interface);

	wl_list_insert(info->infos.prev, &global->link);
}

static void
print_output_info(void *data)
{
	struct output_info *output = data;
	struct output_mode *mode;
	const char *subpixel_orientation;
	const char *transform;

	print_global_info(data);

	switch (output->geometry.subpixel) {
	case WL_OUTPUT_SUBPIXEL_UNKNOWN:
		subpixel_orientation = "unknown";
		break;
	case WL_OUTPUT_SUBPIXEL_NONE:
		subpixel_orientation = "none";
		break;
	case WL_OUTPUT_SUBPIXEL_HORIZONTAL_RGB:
		subpixel_orientation = "horizontal rgb";
		break;
	case WL_OUTPUT_SUBPIXEL_HORIZONTAL_BGR:
		subpixel_orientation = "horizontal bgr";
		break;
	case WL_OUTPUT_SUBPIXEL_VERTICAL_RGB:
		subpixel_orientation = "vertical rgb";
		break;
	case WL_OUTPUT_SUBPIXEL_VERTICAL_BGR:
		subpixel_orientation = "vertical bgr";
		break;
	default:
		fprintf(stderr, "unknown subpixel orientation %u\n",
			output->geometry.subpixel);
		subpixel_orientation = "unexpected value";
		break;
	}

	switch (output->geometry.output_transform) {
	case WL_OUTPUT_TRANSFORM_NORMAL:
		transform = "normal";
		break;
	case WL_OUTPUT_TRANSFORM_90:
		transform = "90°";
		break;
	case WL_OUTPUT_TRANSFORM_180:
		transform = "180°";
		break;
	case WL_OUTPUT_TRANSFORM_270:
		transform = "270°";
		break;
	case WL_OUTPUT_TRANSFORM_FLIPPED:
		transform = "flipped";
		break;
	case WL_OUTPUT_TRANSFORM_FLIPPED_90:
		transform = "flipped 90°";
		break;
	case WL_OUTPUT_TRANSFORM_FLIPPED_180:
		transform = "flipped 180°";
		break;
	case WL_OUTPUT_TRANSFORM_FLIPPED_270:
		transform = "flipped 270°";
		break;
	default:
		fprintf(stderr, "unknown output transform %u\n",
			output->geometry.output_transform);
		transform = "unexpected value";
		break;
	}

	printf("\tx: %d, y: %d,",
	       output->geometry.x, output->geometry.y);
	if (output->version >= 2)
		printf(" scale: %d,", output->geometry.scale);
	printf("\n");

	printf("\tphysical_width: %d mm, physical_height: %d mm,\n",
	       output->geometry.physical_width,
	       output->geometry.physical_height);
	printf("\tmake: '%s', model: '%s',\n",
	       output->geometry.make, output->geometry.model);
	printf("\tsubpixel_orientation: %s, output_transform: %s,\n",
	       subpixel_orientation, transform);

	wl_list_for_each(mode, &output->modes, link) {
		printf("\tmode:\n");

		printf("\t\twidth: %d px, height: %d px, refresh: %.3f Hz,\n",
		       mode->width, mode->height,
		       (float) mode->refresh / 1000);

		printf("\t\tflags:");
		if (mode->flags & WL_OUTPUT_MODE_CURRENT)
			printf(" current");
		if (mode->flags & WL_OUTPUT_MODE_PREFERRED)
			printf(" preferred");
		printf("\n");
	}
}

static char
bits2graph(uint32_t value, unsigned bitoffset)
{
	int c = (value >> bitoffset) & 0xff;

	if (isgraph(c) || isspace(c))
		return c;

	return '?';
}

static void
fourcc2str(uint32_t format, char *str, int len)
{
	int i;

	assert(len >= 5);

	for (i = 0; i < 4; i++)
		str[i] = bits2graph(format, i * 8);
	str[i] = '\0';
}

static void
print_shm_info(void *data)
{
	char str[5];
	struct shm_info *shm = data;
	struct shm_format *format;

	print_global_info(data);

	printf("\tformats:");

	wl_list_for_each(format, &shm->formats, link)
		switch (format->format) {
		case WL_SHM_FORMAT_ARGB8888:
			printf(" ARGB8888");
			break;
		case WL_SHM_FORMAT_XRGB8888:
			printf(" XRGB8888");
			break;
		case WL_SHM_FORMAT_RGB565:
			printf(" RGB565");
			break;
		default:
			fourcc2str(format->format, str, sizeof(str));
			printf(" '%s'(0x%08x)", str, format->format);
			break;
		}

	printf("\n");
}

static void
print_seat_info(void *data)
{
	struct seat_info *seat = data;

	print_global_info(data);

	printf("\tname: %s\n", seat->name);
	printf("\tcapabilities:");

	if (seat->capabilities & WL_SEAT_CAPABILITY_POINTER)
		printf(" pointer");
	if (seat->capabilities & WL_SEAT_CAPABILITY_KEYBOARD)
		printf(" keyboard");
	if (seat->capabilities & WL_SEAT_CAPABILITY_TOUCH)
		printf(" touch");

	printf("\n");

	if (seat->repeat_rate > 0)
		printf("\tkeyboard repeat rate: %d\n", seat->repeat_rate);
	if (seat->repeat_delay > 0)
		printf("\tkeyboard repeat delay: %d\n", seat->repeat_delay);
}

static void
keyboard_handle_keymap(void *data, struct wl_keyboard *keyboard,
		       uint32_t format, int fd, uint32_t size)
{
}

static void
keyboard_handle_enter(void *data, struct wl_keyboard *keyboard,
		      uint32_t serial, struct wl_surface *surface,
		      struct wl_array *keys)
{
}

static void
keyboard_handle_leave(void *data, struct wl_keyboard *keyboard,
		      uint32_t serial, struct wl_surface *surface)
{
}

static void
keyboard_handle_key(void *data, struct wl_keyboard *keyboard,
		    uint32_t serial, uint32_t time, uint32_t key,
		    uint32_t state)
{
}

static void
keyboard_handle_modifiers(void *data, struct wl_keyboard *keyboard,
			  uint32_t serial, uint32_t mods_depressed,
			  uint32_t mods_latched, uint32_t mods_locked,
			  uint32_t group)
{
}

static void
keyboard_handle_repeat_info(void *data, struct wl_keyboard *keyboard,
			    int32_t rate, int32_t delay)
{
	struct seat_info *seat = data;

	seat->repeat_rate = rate;
	seat->repeat_delay = delay;
}

static const struct wl_keyboard_listener keyboard_listener = {
	keyboard_handle_keymap,
	keyboard_handle_enter,
	keyboard_handle_leave,
	keyboard_handle_key,
	keyboard_handle_modifiers,
	keyboard_handle_repeat_info,
};

static void
seat_handle_capabilities(void *data, struct wl_seat *wl_seat,
			 enum wl_seat_capability caps)
{
	struct seat_info *seat = data;

	seat->capabilities = caps;

	/* we want listen for repeat_info from wl_keyboard, but only
	 * do so if the seat info is >= 4 and if we actually have a
	 * keyboard */
	if (seat->global.version < 4)
		return;

	if (caps & WL_SEAT_CAPABILITY_KEYBOARD) {
		struct wl_keyboard *keyboard;

		keyboard = wl_seat_get_keyboard(seat->seat);
		wl_keyboard_add_listener(keyboard, &keyboard_listener,
					 seat);

		seat->info->roundtrip_needed = true;
	}
}

static void
seat_handle_name(void *data, struct wl_seat *wl_seat,
		 const char *name)
{
	struct seat_info *seat = data;
	seat->name = xstrdup(name);
}

static const struct wl_seat_listener seat_listener = {
	seat_handle_capabilities,
	seat_handle_name,
};

static void
destroy_seat_info(void *data)
{
	struct seat_info *seat = data;

	wl_seat_destroy(seat->seat);

	if (seat->name != NULL)
		free(seat->name);
}

static void
add_seat_info(struct weston_info *info, uint32_t id, uint32_t version)
{
	struct seat_info *seat = xzalloc(sizeof *seat);

	/* required to set roundtrip_needed to true in capabilities
	 * handler */
	seat->info = info;

	init_global_info(info, &seat->global, id, "wl_seat", version);
	seat->global.print = print_seat_info;
	seat->global.destroy = destroy_seat_info;

	seat->seat = wl_registry_bind(info->registry,
				      id, &wl_seat_interface, MIN(version, 4));
	wl_seat_add_listener(seat->seat, &seat_listener, seat);

	seat->repeat_rate = seat->repeat_delay = -1;

	info->roundtrip_needed = true;
}

static void
shm_handle_format(void *data, struct wl_shm *wl_shm, uint32_t format)
{
	struct shm_info *shm = data;
	struct shm_format *shm_format = xzalloc(sizeof *shm_format);

	wl_list_insert(&shm->formats, &shm_format->link);
	shm_format->format = format;
}

static const struct wl_shm_listener shm_listener = {
	shm_handle_format,
};

static void
destroy_shm_info(void *data)
{
	struct shm_info *shm = data;
	struct shm_format *format, *tmp;

	wl_list_for_each_safe(format, tmp, &shm->formats, link) {
		wl_list_remove(&format->link);
		free(format);
	}

	wl_shm_destroy(shm->shm);
}

static void
add_shm_info(struct weston_info *info, uint32_t id, uint32_t version)
{
	struct shm_info *shm = xzalloc(sizeof *shm);

	init_global_info(info, &shm->global, id, "wl_shm", version);
	shm->global.print = print_shm_info;
	shm->global.destroy = destroy_shm_info;

	wl_list_init(&shm->formats);

	shm->shm = wl_registry_bind(info->registry,
				    id, &wl_shm_interface, 1);
	wl_shm_add_listener(shm->shm, &shm_listener, shm);

	info->roundtrip_needed = true;
}

static void
output_handle_geometry(void *data, struct wl_output *wl_output,
		       int32_t x, int32_t y,
		       int32_t physical_width, int32_t physical_height,
		       int32_t subpixel,
		       const char *make, const char *model,
		       int32_t output_transform)
{
	struct output_info *output = data;

	output->geometry.x = x;
	output->geometry.y = y;
	output->geometry.physical_width = physical_width;
	output->geometry.physical_height = physical_height;
	output->geometry.subpixel = subpixel;
	output->geometry.make = xstrdup(make);
	output->geometry.model = xstrdup(model);
	output->geometry.output_transform = output_transform;
}

static void
output_handle_mode(void *data, struct wl_output *wl_output,
		   uint32_t flags, int32_t width, int32_t height,
		   int32_t refresh)
{
	struct output_info *output = data;
	struct output_mode *mode = xmalloc(sizeof *mode);

	mode->flags = flags;
	mode->width = width;
	mode->height = height;
	mode->refresh = refresh;

	wl_list_insert(output->modes.prev, &mode->link);
}

static void
output_handle_done(void *data, struct wl_output *wl_output)
{
	/* don't bother waiting for this; there's no good reason a
	 * compositor will wait more than one roundtrip before sending
	 * these initial events. */
}

static void
output_handle_scale(void *data, struct wl_output *wl_output,
		    int32_t scale)
{
	struct output_info *output = data;

	output->geometry.scale = scale;
}

static const struct wl_output_listener output_listener = {
	output_handle_geometry,
	output_handle_mode,
	output_handle_done,
	output_handle_scale,
};

static void
destroy_output_info(void *data)
{
	struct output_info *output = data;
	struct output_mode *mode, *tmp;

	wl_output_destroy(output->output);

	if (output->geometry.make != NULL)
		free(output->geometry.make);
	if (output->geometry.model != NULL)
		free(output->geometry.model);

	wl_list_for_each_safe(mode, tmp, &output->modes, link) {
		wl_list_remove(&mode->link);
		free(mode);
	}
}

static void
add_output_info(struct weston_info *info, uint32_t id, uint32_t version)
{
	struct output_info *output = xzalloc(sizeof *output);

	init_global_info(info, &output->global, id, "wl_output", version);
	output->global.print = print_output_info;
	output->global.destroy = destroy_output_info;

	output->version = MIN(version, 2);
	output->geometry.scale = 1;
	wl_list_init(&output->modes);

	output->output = wl_registry_bind(info->registry, id,
					  &wl_output_interface, output->version);
	wl_output_add_listener(output->output, &output_listener,
			       output);

	info->roundtrip_needed = true;
}

static void
destroy_presentation_info(void *info)
{
	struct presentation_info *prinfo = info;

	wp_presentation_destroy(prinfo->presentation);
}

static const char *
clock_name(clockid_t clk_id)
{
	static const char *names[] = {
		[CLOCK_REALTIME] =		"CLOCK_REALTIME",
		[CLOCK_MONOTONIC] =		"CLOCK_MONOTONIC",
		[CLOCK_MONOTONIC_RAW] =		"CLOCK_MONOTONIC_RAW",
		[CLOCK_REALTIME_COARSE] =	"CLOCK_REALTIME_COARSE",
		[CLOCK_MONOTONIC_COARSE] =	"CLOCK_MONOTONIC_COARSE",
#ifdef CLOCK_BOOTTIME
		[CLOCK_BOOTTIME] =		"CLOCK_BOOTTIME",
#endif
	};

	if (clk_id < 0 || (unsigned)clk_id >= ARRAY_LENGTH(names))
		return "unknown";

	return names[clk_id];
}

static void
print_presentation_info(void *info)
{
	struct presentation_info *prinfo = info;

	print_global_info(info);

	printf("\tpresentation clock id: %d (%s)\n",
		prinfo->clk_id, clock_name(prinfo->clk_id));
}

static void
presentation_handle_clock_id(void *data, struct wp_presentation *presentation,
			     uint32_t clk_id)
{
	struct presentation_info *prinfo = data;

	prinfo->clk_id = clk_id;
}

static const struct wp_presentation_listener presentation_listener = {
	presentation_handle_clock_id
};

static void
add_presentation_info(struct weston_info *info, uint32_t id, uint32_t version)
{
	struct presentation_info *prinfo = xzalloc(sizeof *prinfo);

	init_global_info(info, &prinfo->global, id,
			 wp_presentation_interface.name, version);
	prinfo->global.print = print_presentation_info;
	prinfo->global.destroy = destroy_presentation_info;

	prinfo->clk_id = -1;
	prinfo->presentation = wl_registry_bind(info->registry, id,
						&wp_presentation_interface, 1);
	wp_presentation_add_listener(prinfo->presentation,
				     &presentation_listener, prinfo);

	info->roundtrip_needed = true;
}

static void
destroy_global_info(void *data)
{
}

static void
add_global_info(struct weston_info *info, uint32_t id,
		const char *interface, uint32_t version)
{
	struct global_info *global = xzalloc(sizeof *global);

	init_global_info(info, global, id, interface, version);
	global->print = print_global_info;
	global->destroy = destroy_global_info;
}

static void
global_handler(void *data, struct wl_registry *registry, uint32_t id,
	       const char *interface, uint32_t version)
{
	struct weston_info *info = data;

	if (!strcmp(interface, "wl_seat"))
		add_seat_info(info, id, version);
	else if (!strcmp(interface, "wl_shm"))
		add_shm_info(info, id, version);
	else if (!strcmp(interface, "wl_output"))
		add_output_info(info, id, version);
	else if (!strcmp(interface, wp_presentation_interface.name))
		add_presentation_info(info, id, version);
	else
		add_global_info(info, id, interface, version);
}

static void
global_remove_handler(void *data, struct wl_registry *registry, uint32_t name)
{
}

static const struct wl_registry_listener registry_listener = {
	global_handler,
	global_remove_handler
};

static void
print_infos(struct wl_list *infos)
{
	struct global_info *info;

	wl_list_for_each(info, infos, link)
		info->print(info);
}

static void
destroy_info(void *data)
{
	struct global_info *global = data;

	global->destroy(data);
	wl_list_remove(&global->link);
	free(global->interface);
	free(data);
}

static void
destroy_infos(struct wl_list *infos)
{
	struct global_info *info, *tmp;
	wl_list_for_each_safe(info, tmp, infos, link)
		destroy_info(info);
}

int
main(int argc, char **argv)
{
	struct weston_info info;

	info.display = wl_display_connect(NULL);
	if (!info.display) {
		fprintf(stderr, "failed to create display: %m\n");
		return -1;
	}

	wl_list_init(&info.infos);

	info.registry = wl_display_get_registry(info.display);
	wl_registry_add_listener(info.registry, &registry_listener, &info);

	do {
		info.roundtrip_needed = false;
		wl_display_roundtrip(info.display);
	} while (info.roundtrip_needed);

	print_infos(&info.infos);
	destroy_infos(&info.infos);

	wl_registry_destroy(info.registry);
	wl_display_disconnect(info.display);

	return 0;
}