#include <catch2/catch_test_macros.hpp>
#include <iostream>

#include "node.h"

int get_node_id(node *n) {
  // TODO: ensure the test calling this starts at node_id 0 (currently this is
  // undefined based on order the tests are run)
  // for the time being, this gets the offset
  int id = std::stoi(n->get_name().substr(5));
  // this tests if the node id was correctly extracted
  REQUIRE(n->get_name() == "node_" + std::to_string(id));
  return id;
}

TEST_CASE("Name") {
  node *n = new node("test");
  REQUIRE(n->get_name() == "test");
  n->set_name("foo");
  REQUIRE(n->get_name() == "foo");
  delete n;
}

TEST_CASE("Number of children") {
  node *n = new node("test");
  REQUIRE(n->get_nr_children() == 0);
  for (std::size_t i = 0; i < 20; i++) {
    node *child = new node("child");
    n->add_child(child);
  }
  REQUIRE(n->get_nr_children() == 20);
  delete n;
}

TEST_CASE("Get children") {
  node *n = new node("test");
  REQUIRE(n->get_nr_children() == 0);
  for (std::size_t i = 0; i < 5; i++) {
    n->add_child(new node("child " + std::to_string(i)));
  }
  for (std::size_t i = 0; i < 5; i++) {
    REQUIRE(n->get_child(i)->get_name() == "child " + std::to_string(i));
  }
  delete n;
}

TEST_CASE("Global node counting") {
  node *n = new node();

  const int node_id_start = get_node_id(n);

  for (std::size_t i = 0; i < 5; i++) {
    n->add_child(new node());
  }
  n->add_child(new node("explicit name"));
  for (std::size_t i = 0; i < 5; i++) {
    REQUIRE(n->get_child(i)->get_name() ==
            "node_" + std::to_string(node_id_start + 1 + i));
  }
  REQUIRE(n->get_child(5)->get_name() == "explicit name");
  delete n;
}

TEST_CASE("Create complete tree") {
  const std::size_t nr_child_nodes = 2;
  const unsigned int tree_depth = 4;
  node *t = create_complete_tree(nr_child_nodes, tree_depth);

  int count = get_node_id(t);

  REQUIRE(t->get_name() == "node_" + std::to_string(count++));

  // this is very verbose,
  // but without a serialisation,
  // there is no other good way I could find (that does not also implement the
  // logic to test).
  REQUIRE(t->get_child(0)->get_name() == "node_" + std::to_string(count++));
  REQUIRE(t->get_child(0)->get_child(0)->get_name() ==
          "node_" + std::to_string(count++));
  REQUIRE(t->get_child(0)->get_child(0)->get_child(0)->get_name() ==
          "node_" + std::to_string(count++));
  REQUIRE(t->get_child(0)->get_child(0)->get_child(1)->get_name() ==
          "node_" + std::to_string(count++));
  REQUIRE(t->get_child(0)->get_child(1)->get_name() ==
          "node_" + std::to_string(count++));
  REQUIRE(t->get_child(0)->get_child(1)->get_child(0)->get_name() ==
          "node_" + std::to_string(count++));
  REQUIRE(t->get_child(0)->get_child(1)->get_child(1)->get_name() ==
          "node_" + std::to_string(count++));
  REQUIRE(t->get_child(1)->get_name() == "node_" + std::to_string(count++));
  REQUIRE(t->get_child(1)->get_child(0)->get_name() ==
          "node_" + std::to_string(count++));
  REQUIRE(t->get_child(1)->get_child(0)->get_child(0)->get_name() ==
          "node_" + std::to_string(count++));
  REQUIRE(t->get_child(1)->get_child(0)->get_child(1)->get_name() ==
          "node_" + std::to_string(count++));
  REQUIRE(t->get_child(1)->get_child(1)->get_name() ==
          "node_" + std::to_string(count++));
  REQUIRE(t->get_child(1)->get_child(1)->get_child(0)->get_name() ==
          "node_" + std::to_string(count++));
  REQUIRE(t->get_child(1)->get_child(1)->get_child(1)->get_name() ==
          "node_" + std::to_string(count++));

  REQUIRE(t->get_nr_children() == nr_child_nodes);
  REQUIRE(t->get_child(0)->get_nr_children() == nr_child_nodes);
  REQUIRE(t->get_child(0)->get_child(0)->get_nr_children() == nr_child_nodes);
  REQUIRE(t->get_child(0)->get_child(1)->get_nr_children() == nr_child_nodes);
  REQUIRE(t->get_child(1)->get_nr_children() == nr_child_nodes);
  REQUIRE(t->get_child(1)->get_child(0)->get_nr_children() == nr_child_nodes);
  REQUIRE(t->get_child(1)->get_child(1)->get_nr_children() == nr_child_nodes);

  delete t;
}