#include <stdio.h>
#include <spa/param/video/format-utils.h>

#include "main.hpp"
#include "pipewire.hpp"

static void stream_handle_state_changed(void *data, enum pw_stream_state old_stream_state, enum pw_stream_state stream_state, const char *error)
{
	struct pipewire_state *state = (struct pipewire_state *) data;

	fprintf(stderr, "pipewire: stream state changed: %s\n", pw_stream_state_as_string(stream_state));

	switch (stream_state) {
	case PW_STREAM_STATE_PAUSED:
		if (state->stream_node_id == SPA_ID_INVALID) {
			state->stream_node_id = pw_stream_get_node_id(state->stream);
		}
		break;
	case PW_STREAM_STATE_STREAMING:
		break;
	default:
		break;
	}
}

static const struct pw_stream_events stream_events = {
	.version = PW_VERSION_STREAM_EVENTS,
	.state_changed = stream_handle_state_changed,
	//.param_changed = stream_handle_param_changed,
	//.add_buffer = stream_handle_add_buffer,
	//.remove_buffer = stream_handle_remove_buffer,
};

bool init_pipewire(void)
{
	pw_init(nullptr, nullptr);

	struct pipewire_state state = { .stream_node_id = SPA_ID_INVALID };

	state.loop = pw_loop_new(nullptr);
	if (!state.loop) {
		fprintf(stderr, "pipewire: pw_loop_new failed\n");
		return false;
	}

	state.context = pw_context_new(state.loop, nullptr, 0);
	if (!state.context) {
		fprintf(stderr, "pipewire: pw_context_new failed\n");
		return false;
	}

	state.core = pw_context_connect(state.context, nullptr, 0);
	if (!state.core) {
		fprintf(stderr, "pipewire: pw_context_connect failed\n");
		return false;
	}

	state.stream = pw_stream_new(state.core, "gamescope",
		pw_properties_new(
			PW_KEY_MEDIA_CLASS, "Video/Source",
			nullptr));
	if (!state.stream) {
		fprintf(stderr, "pipewire: pw_stream_new failed\n");
		return false;
	}

	struct spa_hook stream_hook;
	pw_stream_add_listener(state.stream, &stream_hook, &stream_events, &state);

	struct spa_rectangle size = SPA_RECTANGLE(g_nOutputWidth, g_nOutputHeight);
	struct spa_fraction framerate = SPA_FRACTION(0, 1);

	uint8_t buf[1024];
	struct spa_pod_builder builder = SPA_POD_BUILDER_INIT(buf, sizeof(buf));
	const struct spa_pod *param = (const struct spa_pod *)spa_pod_builder_add_object(&builder,
		SPA_TYPE_OBJECT_Format, SPA_PARAM_EnumFormat,
		SPA_FORMAT_mediaType, SPA_POD_Id(SPA_MEDIA_TYPE_video),
		SPA_FORMAT_mediaSubtype, SPA_POD_Id(SPA_MEDIA_SUBTYPE_raw),
		SPA_FORMAT_VIDEO_format, SPA_POD_Id(SPA_VIDEO_FORMAT_RGB),
		SPA_FORMAT_VIDEO_size, SPA_POD_Rectangle(&size),
		SPA_FORMAT_VIDEO_framerate, SPA_POD_Fraction(&framerate));

	// TODO: PW_STREAM_FLAG_ALLOC_BUFFERS
	enum pw_stream_flags flags = PW_STREAM_FLAG_DRIVER;
	int ret = pw_stream_connect(state.stream, PW_DIRECTION_OUTPUT, PW_ID_ANY, flags, &param, 1);
	if (ret != 0) {
		fprintf(stderr, "pipewire: pw_stream_connect failed\n");
		return false;
	}

	while (state.stream_node_id == SPA_ID_INVALID) {
		int ret = pw_loop_iterate(state.loop, -1);
		if (ret < 0) {
			fprintf(stderr, "pipewire: pw_loop_iterate failed\n");
			return false;
		}
	}

	fprintf(stderr, "pipewire: stream available on node ID: %u\n", state.stream_node_id);

	return true;
}