/* Spa */
/* SPDX-FileCopyrightText: Copyright © 2018 Wim Taymans */
/* SPDX-License-Identifier: MIT */

/*
 [title]
 [title]
 */

#include "config.h"

#include <math.h>
#include <string.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <dlfcn.h>
#include <errno.h>
#include <pthread.h>
#include <poll.h>

#include <spa/support/plugin.h>
#include <spa/support/log-impl.h>
#include <spa/support/loop.h>
#include <spa/node/node.h>
#include <spa/node/io.h>
#include <spa/node/utils.h>
#include <spa/param/param.h>
#include <spa/param/props.h>
#include <spa/param/audio/format-utils.h>
#include <spa/utils/names.h>
#include <spa/utils/result.h>
#include <spa/utils/string.h>

#define M_PI_M2 ( M_PI + M_PI )

static SPA_LOG_IMPL(default_log);

#define spa_debug(f,...) spa_log_trace(&default_log.log, f, __VA_ARGS__)

#include <spa/graph/graph.h>

#include <spa/debug/pod.h>

struct buffer {
	struct spa_buffer buffer;
	struct spa_meta metas[1];
	struct spa_meta_header header;
	struct spa_data datas[1];
	struct spa_chunk chunks[1];
};

struct data {
	const char *plugin_dir;
	struct spa_log *log;
	struct spa_system *system;
	struct spa_loop *loop;
	struct spa_loop_control *control;
	struct spa_support support[5];
	uint32_t n_support;

	struct spa_graph graph;
	struct spa_graph_state graph_state;
	struct spa_graph_node source_node;
	struct spa_graph_state source_state;
	struct spa_graph_port source_out;
	struct spa_graph_port sink_in;
	struct spa_graph_node sink_node;
	struct spa_graph_state sink_state;

	struct spa_node *sink;

	struct spa_node *source;
	struct spa_io_buffers source_sink_io[1];
	struct spa_buffer *source_buffers[1];
	struct buffer source_buffer[1];

	uint8_t ctrl[1024];
	double freq_accum;
	double volume_accum;

	bool running;
	pthread_t thread;
};

#define MIN_LATENCY     1024

#define BUFFER_SIZE     4096

static void
init_buffer(struct data *data, struct spa_buffer **bufs, struct buffer *ba, int n_buffers,
	    size_t size)
{
	int i;

	for (i = 0; i < n_buffers; i++) {
		struct buffer *b = &ba[i];
		bufs[i] = &b->buffer;

		b->buffer.metas = b->metas;
		b->buffer.n_metas = 1;
		b->buffer.datas = b->datas;
		b->buffer.n_datas = 1;

		b->header.flags = 0;
		b->header.seq = 0;
		b->header.pts = 0;
		b->header.dts_offset = 0;
		b->metas[0].type = SPA_META_Header;
		b->metas[0].data = &b->header;
		b->metas[0].size = sizeof(b->header);

		b->datas[0].type = SPA_DATA_MemPtr;
		b->datas[0].flags = 0;
		b->datas[0].fd = -1;
		b->datas[0].mapoffset = 0;
		b->datas[0].maxsize = size;
		b->datas[0].data = malloc(size);
		b->datas[0].chunk = &b->chunks[0];
		b->datas[0].chunk->offset = 0;
		b->datas[0].chunk->size = 0;
		b->datas[0].chunk->stride = 0;
	}
}

static int make_node(struct data *data, struct spa_node **node, const char *lib, const char *name)
{
	struct spa_handle *handle;
	int res;
	void *hnd;
	spa_handle_factory_enum_func_t enum_func;
	uint32_t i;
	char *path;

	if ((path = spa_aprintf("%s/%s", data->plugin_dir, lib)) == NULL) {
		return -ENOMEM;
	}
	if ((hnd = dlopen(path, RTLD_NOW)) == NULL) {
		printf("can't load %s: %s\n", lib, dlerror());
		free(path);
		return -ENOENT;
	}
	free(path);
	if ((enum_func = dlsym(hnd, SPA_HANDLE_FACTORY_ENUM_FUNC_NAME)) == NULL) {
		printf("can't find enum function\n");
		return -ENOENT;
	}

	for (i = 0;;) {
		const struct spa_handle_factory *factory;
		void *iface;

		if ((res = enum_func(&factory, &i)) <= 0) {
			if (res != 0)
				printf("can't enumerate factories: %s\n", spa_strerror(res));
			break;
		}
		if (factory->version < 1)
			continue;
		if (!spa_streq(factory->name, name))
			continue;

		handle = calloc(1, spa_handle_factory_get_size(factory, NULL));
		if ((res =
		     spa_handle_factory_init(factory, handle, NULL, data->support,
					     data->n_support)) < 0) {
			printf("can't make factory instance: %d\n", res);
			return res;
		}
		if ((res = spa_handle_get_interface(handle, SPA_TYPE_INTERFACE_Node, &iface)) < 0) {
			printf("can't get interface %d\n", res);
			return res;
		}
		*node = iface;
		return 0;
	}
	return -EBADF;
}

static void update_props(struct data *data)
{
	struct spa_pod_builder b;
	struct spa_pod *pod;
	struct spa_pod_frame f[2];

	spa_pod_builder_init(&b, data->ctrl, sizeof(data->ctrl));

#if 0
	spa_pod_builder_push_sequence(&b, &f[0], 0);
	spa_pod_builder_control(&b, 0, SPA_CONTROL_Properties);
	spa_pod_builder_push_object(&b, &f[1], SPA_TYPE_OBJECT_Props, 0);
	spa_pod_builder_prop(&b, SPA_PROP_frequency, 0);
	spa_pod_builder_float(&b, ((sin(data->freq_accum) + 1.0) * 200.0) + 440.0);
	spa_pod_builder_prop(&b, SPA_PROP_volume, 0);
	spa_pod_builder_float(&b, (sin(data->volume_accum) / 2.0) + 0.5);
	spa_pod_builder_pop(&b, &f[1]);
	pod = spa_pod_builder_pop(&b, &f[0]);
#else
	spa_pod_builder_push_sequence(&b, &f[0], 0);
	spa_pod_builder_control(&b, 0, SPA_CONTROL_Properties);
	spa_pod_builder_add_object(&b,
		SPA_TYPE_OBJECT_Props, 0,
		SPA_PROP_frequency, SPA_POD_Float(((sin(data->freq_accum) + 1.0) * 200.0) + 440.0),
		SPA_PROP_volume,    SPA_POD_Float((sin(data->volume_accum) / 2.0) + 0.5));
	pod = spa_pod_builder_pop(&b, &f[0]);
#endif

	spa_debug_pod(0, NULL, pod);

	data->freq_accum += M_PI_M2 / 880.0;
	if (data->freq_accum >= M_PI_M2)
		data->freq_accum -= M_PI_M2;

	data->volume_accum += M_PI_M2 / 2000.0;
	if (data->volume_accum >= M_PI_M2)
		data->volume_accum -= M_PI_M2;
}

static int on_sink_ready(void *_data, int status)
{
	struct data *data = _data;

	update_props(data);

	spa_graph_node_process(&data->source_node);
	spa_graph_node_process(&data->sink_node);
	return 0;
}

static int
on_sink_reuse_buffer(void *_data, uint32_t port_id, uint32_t buffer_id)
{
	struct data *data = _data;

	data->source_sink_io[0].buffer_id = buffer_id;
	return 0;
}

static const struct spa_node_callbacks sink_callbacks = {
	SPA_VERSION_NODE_CALLBACKS,
	.ready = on_sink_ready,
	.reuse_buffer = on_sink_reuse_buffer
};

static int make_nodes(struct data *data, const char *device)
{
	int res;
	struct spa_pod *props;
	struct spa_pod_builder b = { 0 };
	uint8_t buffer[512];
	//uint32_t idx;

	if ((res = make_node(data, &data->sink,
			     "alsa/libspa-alsa.so",
			     SPA_NAME_API_ALSA_PCM_SINK)) < 0) {
		printf("can't create alsa-sink: %d\n", res);
		return res;
	}
	spa_node_set_callbacks(data->sink, &sink_callbacks, data);

	spa_pod_builder_init(&b, buffer, sizeof(buffer));
	props = spa_pod_builder_add_object(&b,
		SPA_TYPE_OBJECT_Props, 0,
		SPA_PROP_device,     SPA_POD_String(device ? device : "hw:0"),
		SPA_PROP_minLatency, SPA_POD_Int(MIN_LATENCY));

	spa_debug_pod(0, NULL, props);

	if ((res = spa_node_set_param(data->sink, SPA_PARAM_Props, 0, props)) < 0)
		printf("got set_props error %d\n", res);

	if ((res = make_node(data, &data->source,
			     "audiotestsrc/libspa-audiotestsrc.so",
			     "audiotestsrc")) < 0) {
		printf("can't create audiotestsrc: %d\n", res);
		return res;
	}

	spa_pod_builder_init(&b, buffer, sizeof(buffer));
	props = spa_pod_builder_add_object(&b,
		SPA_TYPE_OBJECT_Props, 0,
		SPA_PROP_frequency, SPA_POD_Float(600.0),
		SPA_PROP_volume,    SPA_POD_Float(0.5),
		SPA_PROP_live,      SPA_POD_Bool(false));

	if ((res = spa_node_set_param(data->source, SPA_PARAM_Props, 0, props)) < 0)
		printf("got set_props error %d\n", res);

	if ((res = spa_node_port_set_io(data->source,
				     SPA_DIRECTION_OUTPUT, 0,
				     SPA_IO_Control,
				     &data->ctrl, sizeof(data->ctrl))) < 0) {
		printf("can't set_io freq: %d\n", res);
		return res;
	}

	data->source_sink_io[0] = SPA_IO_BUFFERS_INIT;

	spa_node_port_set_io(data->source,
			     SPA_DIRECTION_OUTPUT, 0,
			     SPA_IO_Buffers,
			     &data->source_sink_io[0], sizeof(data->source_sink_io[0]));
	spa_node_port_set_io(data->sink,
			     SPA_DIRECTION_INPUT, 0,
			     SPA_IO_Buffers,
			     &data->source_sink_io[0], sizeof(data->source_sink_io[0]));

	spa_graph_node_init(&data->source_node, &data->source_state);
	spa_graph_node_set_callbacks(&data->source_node, &spa_graph_node_impl_default, data->source);
	spa_graph_node_add(&data->graph, &data->source_node);
	spa_graph_port_init(&data->source_out, SPA_DIRECTION_OUTPUT, 0, 0);
	spa_graph_port_add(&data->source_node, &data->source_out);

	spa_graph_node_init(&data->sink_node, &data->sink_state);
	spa_graph_node_set_callbacks(&data->sink_node, &spa_graph_node_impl_default, data->sink);
	spa_graph_node_add(&data->graph, &data->sink_node);
	spa_graph_port_init(&data->sink_in, SPA_DIRECTION_INPUT, 0, 0);
	spa_graph_port_add(&data->sink_node, &data->sink_in);

	spa_graph_port_link(&data->source_out, &data->sink_in);

	return res;
}

static int negotiate_formats(struct data *data)
{
	int res;
	struct spa_pod *format;
	struct spa_pod_builder b = { 0 };
	uint8_t buffer[4096];

	spa_pod_builder_init(&b, buffer, sizeof(buffer));
	format = spa_format_audio_raw_build(&b, 0,
			&SPA_AUDIO_INFO_RAW_INIT(
				.format = SPA_AUDIO_FORMAT_S16,
				.rate = 48000,
				.channels = 2 ));

	if ((res = spa_node_port_set_param(data->sink,
					   SPA_DIRECTION_INPUT, 0,
					   SPA_PARAM_Format, 0, format)) < 0)
		return res;

	if ((res = spa_node_port_set_param(data->source,
					   SPA_DIRECTION_OUTPUT, 0,
					   SPA_PARAM_Format, 0, format)) < 0)
		return res;

	init_buffer(data, data->source_buffers, data->source_buffer, 1, BUFFER_SIZE);
	if ((res =
	     spa_node_port_use_buffers(data->sink,
		     SPA_DIRECTION_INPUT, 0, 0,
		     data->source_buffers, 1)) < 0)
		return res;
	if ((res =
	     spa_node_port_use_buffers(data->source,
		     SPA_DIRECTION_OUTPUT, 0, 0,
		     data->source_buffers, 1)) < 0)
		return res;

	return 0;
}

static void *loop(void *user_data)
{
	struct data *data = user_data;

	printf("enter thread\n");
	spa_loop_control_enter(data->control);

	while (data->running) {
		spa_loop_control_iterate(data->control, -1);
	}

	printf("leave thread\n");
	spa_loop_control_leave(data->control);

	return NULL;
}

static void run_async_sink(struct data *data)
{
	int res, err;
	struct spa_command cmd;

	cmd = SPA_NODE_COMMAND_INIT(SPA_NODE_COMMAND_Start);
	if ((res = spa_node_send_command(data->sink, &cmd)) < 0)
		printf("got error %d\n", res);

	spa_loop_control_leave(data->control);

	data->running = true;
	if ((err = pthread_create(&data->thread, NULL, loop, data)) != 0) {
		printf("can't create thread: %d %s", err, strerror(err));
		data->running = false;
	}

	printf("sleeping for 1000 seconds\n");
	sleep(1000);

	if (data->running) {
		data->running = false;
		pthread_join(data->thread, NULL);
	}

	spa_loop_control_enter(data->control);

	cmd = SPA_NODE_COMMAND_INIT(SPA_NODE_COMMAND_Pause);
	if ((res = spa_node_send_command(data->sink, &cmd)) < 0)
		printf("got error %d\n", res);
}

static int load_handle(struct data *data, struct spa_handle **handle, const char *lib, const char *name)
{
	int res;
	void *hnd;
	spa_handle_factory_enum_func_t enum_func;
	uint32_t i;
	char *path;

	if ((path = spa_aprintf("%s/%s", data->plugin_dir, lib)) == NULL) {
		return -ENOMEM;
	}
	if ((hnd = dlopen(path, RTLD_NOW)) == NULL) {
		printf("can't load %s: %s\n", lib, dlerror());
		free(path);
		return -ENOENT;
	}
	free(path);
	if ((enum_func = dlsym(hnd, SPA_HANDLE_FACTORY_ENUM_FUNC_NAME)) == NULL) {
		printf("can't find enum function\n");
		return -ENOENT;
	}

	for (i = 0;;) {
		const struct spa_handle_factory *factory;

		if ((res = enum_func(&factory, &i)) <= 0) {
			if (res != 0)
				printf("can't enumerate factories: %s\n", spa_strerror(res));
			break;
		}
		if (factory->version < 1)
			continue;
		if (!spa_streq(factory->name, name))
			continue;

		*handle = calloc(1, spa_handle_factory_get_size(factory, NULL));
		if ((res = spa_handle_factory_init(factory, *handle,
						NULL, data->support,
						data->n_support)) < 0) {
			printf("can't make factory instance: %d\n", res);
			return res;
		}
		return 0;
	}
	return -EBADF;
}

static int init_data(struct data *data)
{
	int res;
	const char *str;
	struct spa_handle *handle = NULL;
	void *iface;

	if ((str = getenv("SPA_PLUGIN_DIR")) == NULL)
		str = PLUGINDIR;
	data->plugin_dir = str;

	/* init the graph */
	spa_graph_init(&data->graph, &data->graph_state);

	/* set the default log */
	data->log = &default_log.log;
	data->support[data->n_support++] = SPA_SUPPORT_INIT(SPA_TYPE_INTERFACE_Log, data->log);

	/* load and set support system */
	if ((res = load_handle(data, &handle,
					"support/libspa-support.so",
					SPA_NAME_SUPPORT_SYSTEM)) < 0)
		return res;
	if ((res = spa_handle_get_interface(handle, SPA_TYPE_INTERFACE_System, &iface)) < 0) {
		printf("can't get System interface %d\n", res);
		return res;
	}
	data->system = iface;
	data->support[data->n_support++] = SPA_SUPPORT_INIT(SPA_TYPE_INTERFACE_System, data->system);
	data->support[data->n_support++] = SPA_SUPPORT_INIT(SPA_TYPE_INTERFACE_DataSystem, data->system);

	/* load and set support loop and loop control */
	if ((res = load_handle(data, &handle,
					"support/libspa-support.so",
					SPA_NAME_SUPPORT_LOOP)) < 0)
		return res;

	if ((res = spa_handle_get_interface(handle, SPA_TYPE_INTERFACE_Loop, &iface)) < 0) {
		printf("can't get interface %d\n", res);
		return res;
	}
	data->loop = iface;
	data->support[data->n_support++] = SPA_SUPPORT_INIT(SPA_TYPE_INTERFACE_Loop, data->loop);
	data->support[data->n_support++] = SPA_SUPPORT_INIT(SPA_TYPE_INTERFACE_DataLoop, data->loop);
	if ((res = spa_handle_get_interface(handle, SPA_TYPE_INTERFACE_LoopControl, &iface)) < 0) {
		printf("can't get interface %d\n", res);
		return res;
	}
	data->control = iface;

	if ((str = getenv("SPA_DEBUG")))
		data->log->level = atoi(str);

	return 0;
}

int main(int argc, char *argv[])
{
	struct data data = { NULL };
	int res;

	if ((res = init_data(&data)) < 0) {
		printf("can't init data: %d (%s)\n", res, spa_strerror(res));
		return -1;
	}

	if ((res = make_nodes(&data, argc > 1 ? argv[1] : NULL)) < 0) {
		printf("can't make nodes: %d (%s)\n", res, spa_strerror(res));
		return -1;
	}
	if ((res = negotiate_formats(&data)) < 0) {
		printf("can't negotiate nodes: %d (%s)\n", res, spa_strerror(res));
		return -1;
	}

	spa_loop_control_enter(data.control);
	run_async_sink(&data);
	spa_loop_control_leave(data.control);

	return 0;
}