/*
  Copyright 2007-2014 David Robillard <http://drobilla.net>

  Permission to use, copy, modify, and/or distribute this software for any
  purpose with or without fee is hereby granted, provided that the above
  copyright notice and this permission notice appear in all copies.

  THIS SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
  WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
  MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
  ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
  WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
  ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
  OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/

#include <assert.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#include "lilv_internal.h"

LILV_API LilvInstance*
lilv_plugin_instantiate(const LilvPlugin*        plugin,
                        double                   sample_rate,
                        const LV2_Feature*const* features)
{
	lilv_plugin_load_if_necessary(plugin);

	LilvInstance* result = NULL;

	const LilvNode* const lib_uri    = lilv_plugin_get_library_uri(plugin);
	const LilvNode* const bundle_uri = lilv_plugin_get_bundle_uri(plugin);

	const char* bundle_path = lilv_uri_to_path(
		lilv_node_as_uri(lilv_plugin_get_bundle_uri(plugin)));

	LilvLib* lib = lilv_lib_open(plugin->world, lib_uri, bundle_path, features);
	if (!lib) {
		return NULL;
	}

	// Parse bundle URI to use as base URI
	const char* bundle_uri_str = lilv_node_as_uri(bundle_uri);
	SerdURI     base_uri;
	if (serd_uri_parse((const uint8_t*)bundle_uri_str, &base_uri)) {
		lilv_lib_close(lib);
		return NULL;
	}

	const LV2_Feature** local_features = NULL;
	if (features == NULL) {
		local_features = (const LV2_Feature**)malloc(sizeof(LV2_Feature));
		local_features[0] = NULL;
	}

	// Search for plugin by URI
	for (uint32_t i = 0; true; ++i) {
		const LV2_Descriptor* ld = lilv_lib_get_plugin(lib, i);
		if (!ld) {
			LILV_ERRORF("No plugin <%s> in <%s>\n",
			            lilv_node_as_uri(lilv_plugin_get_uri(plugin)),
			            lilv_node_as_uri(lib_uri));
			lilv_lib_close(lib);
			break;  // return NULL
		}

		// Resolve library plugin URI against base URI
		SerdURI  abs_uri;
		SerdNode abs_uri_node = serd_node_new_uri_from_string(
			(const uint8_t*)ld->URI, &base_uri, &abs_uri);
		if (!abs_uri_node.buf) {
			LILV_ERRORF("Failed to parse plugin URI `%s'\n", ld->URI);
			lilv_lib_close(lib);
			break;
		}

		if (!strcmp((const char*)abs_uri_node.buf,
		            lilv_node_as_uri(lilv_plugin_get_uri(plugin)))) {
			// Create LilvInstance to return
			result = (LilvInstance*)malloc(sizeof(LilvInstance));
			result->lv2_descriptor = ld;
			result->lv2_handle = ld->instantiate(
				ld, sample_rate, bundle_path,
				(features) ? features : local_features);
			result->pimpl = lib;
			serd_node_free(&abs_uri_node);
			break;
		} else {
			serd_node_free(&abs_uri_node);
		}
	}

	free(local_features);

	if (result) {
		// Failed to instantiate
		if (result->lv2_handle == NULL) {
			free(result);
			return NULL;
		}

		// "Connect" all ports to NULL (catches bugs)
		for (uint32_t i = 0; i < lilv_plugin_get_num_ports(plugin); ++i)
			result->lv2_descriptor->connect_port(result->lv2_handle, i, NULL);
	}

	return result;
}

LILV_API void
lilv_instance_free(LilvInstance* instance)
{
	if (!instance)
		return;

	instance->lv2_descriptor->cleanup(instance->lv2_handle);
	instance->lv2_descriptor = NULL;
	lilv_lib_close((LilvLib*)instance->pimpl);
	instance->pimpl = NULL;
	free(instance);
}

