//
// Created by martin on 04.02.22.
//

#include <fstream>
#include "AnimGraphResource.h"

#include "3rdparty/json/json.hpp"

using json = nlohmann::json;

std::string sPinTypeToStr (SocketType pin_type) {
  std::string result = "unknown";
  switch (pin_type) {
    case SocketType::SocketTypeFloat: result = "Float"; break;
    case SocketType::SocketTypeAnimation: result = "AnimationData"; break;
    default: result = "Unknown";
  }

  return result;
}

json sSocketToJson(const Socket& pin) {
  json result;
  result["name"] = pin.m_name;
  result["type"] = sPinTypeToStr(pin.m_type);
  return result;
}

json sAnimGraphNodeToJson(const AnimNodeResource& node) {
  json result;

  result["name"] = node.m_name;
  result["type"] = "AnimNodeResource";
  result["node_type"] = node.m_type_name;

  for (size_t j = 0; j < 2; j++) {
    result["position"][j] = node.m_position[j];
  }

  return result;
}


AnimNodeResource sAnimGraphNodeFromJson(const json& json_node) {
  AnimNodeResource result;

  result.m_name = json_node["name"];
  result.m_type_name = json_node["node_type"];
  result.m_position[0] = json_node["position"][0];
  result.m_position[1] = json_node["position"][1];

  result.m_anim_node = AnimNodeFactory(result.m_type_name);
  result.m_socket_accessor = AnimNodeAccessorFactory(result.m_type_name,  result.m_anim_node);

  return result;
}


json sAnimGraphConnectionToJson(const AnimGraphConnection& connection) {
  json result;

  result["type"] = "AnimGraphConnection";

  result["source_node_index"] = connection.m_source_node_index;
  result["source_socket_index"] = connection.m_source_socket_index;

  result["target_node_index"] = connection.m_target_node_index;
  result["target_socket_index"] = connection.m_target_socket_index;

  return result;
}


AnimGraphConnection sAnimGraphConnectionFromJson(const json& json_node) {
  AnimGraphConnection connection;

  connection.m_source_node_index = json_node["source_node_index"];
  connection.m_source_socket_index = json_node["source_socket_index"];

  connection.m_target_node_index = json_node["target_node_index"];
  connection.m_target_socket_index = json_node["target_socket_index"];

  return connection;
}


void AnimGraphResource::clear() {
  m_name = "";
  m_nodes.clear();
  m_connections.clear();
}


bool AnimGraphResource::saveToFile (const char* filename) const {
  json result;

  result["name"] = m_name;
  result["type"] = "AnimGraphResource";

  for (size_t i = 0; i < m_nodes.size(); i++) {
    const AnimNodeResource& node = m_nodes[i];
    result["nodes"][i] = sAnimGraphNodeToJson(node);
  }

  for (size_t i = 0; i < m_connections.size(); i++) {
    const AnimGraphConnection& connection = m_connections[i];
    result["connections"][i] = sAnimGraphConnectionToJson(connection);
  }

  std::ofstream output_file;
  output_file.open (filename);
  output_file << to_string(result) << std::endl;
  output_file.close();

  return true;
}

bool AnimGraphResource::loadFromFile (const char* filename) {
  std::ifstream input_file;
  input_file.open(filename);
  std::stringstream buffer;
  buffer << input_file.rdbuf();

  json json_data = json::parse(buffer.str(), nullptr, false);
  if (json_data.is_discarded()) {
    std::cerr << "Error parsing json of file '" << filename << "'." << std::endl;
  }

  if (json_data["type"] != "AnimGraphResource") {
    std::cerr << "Invalid json object. Expected type 'AnimGraphResource' but got '" << json_data["type"] << "'." << std::endl;
  }

  clear();

  m_name = json_data["name"];
  for (size_t i = 0; i < json_data["nodes"].size(); i++) {
    const json& json_node = json_data["nodes"][i];
    if (json_node["type"] != "AnimNodeResource") {
      std::cerr << "Invalid json object. Expected type 'AnimNodeResource' but got '" << json_node["type"] << "'." << std::endl;
      return false;
    }

    AnimNodeResource node = sAnimGraphNodeFromJson(json_node);
    m_nodes.push_back(node);
  }

  for (size_t i = 0; i < json_data["connections"].size(); i++) {
    const json& json_connection = json_data["connections"][i];
    if (json_connection["type"] != "AnimGraphConnection") {
      std::cerr << "Invalid json object. Expected type 'AnimGraphConnection' but got '" << json_connection["type"] << "'." << std::endl;
      return false;
    }

    AnimGraphConnection connection = sAnimGraphConnectionFromJson(json_connection);
    m_connections.push_back(connection);
  }

  return false;
}