// Copyright 2007-2019 David Robillard <d@drobilla.net>
// SPDX-License-Identifier: ISC

#include "lilv_internal.h"

#include <lilv/lilv.h>
#include <lv2/core/lv2.h>
#include <serd/serd.h>

#include <stdbool.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>

LilvInstance*
lilv_plugin_instantiate(const LilvPlugin*         plugin,
                        double                    sample_rate,
                        const LV2_Feature* const* features)
{
  lilv_plugin_load_if_necessary(plugin);
  if (plugin->parse_errors) {
    return NULL;
  }

  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);
  if (!lib_uri || !bundle_uri) {
    return NULL;
  }

  char* const bundle_path =
    lilv_file_uri_parse(lilv_node_as_uri(bundle_uri), NULL);

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

    if (!strcmp(ld->URI, 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;
      break;
    }
  }

  free(local_features);
  serd_free(bundle_path);

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

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);
}