#include <cassert>
#include <string>
#include <utility>

#include "result.hpp"

namespace {

void testSuccessCreation() {
  auto result = core::Result<int>::Success(42);

  assert(result.isSuccess());
  assert(result.getValue() == 42);
}

void testFailureCreation() {
  auto result = core::Result<int>::Failure("Invalid value");

  assert(result.isFailure());
  assert(result.getError() == "Invalid value");
}

void testStatusSuccess() {
  auto status = core::Status::Success(true);

  assert(status.isSuccess());
  assert(status.getValue());
}

void testStatusFailure() {
  auto status = core::Status::Failure("File not found");

  assert(status.isFailure());
  assert(status.getError() == "File not found");
}

void testMoveConstruction() {
  auto source = core::Result<std::string>::Success("hello");

  auto moved = std::move(source);

  assert(moved.isSuccess());
  assert(moved.getValue() == "hello");
}

void testMoveAssignment() {
  auto first = core::Result<int>::Success(10);
  auto second = core::Result<int>::Failure("error");

  second = std::move(first);

  assert(second.isSuccess());
  assert(second.getValue() == 10);
}

void testDifferentTypes() {
  struct User {
    int id;
    std::string name;
  };

  auto result = core::Result<User>::Success(User{1, "Alex"});

  assert(result.isSuccess());
  assert(result.getValue().id == 1);
  assert(result.getValue().name == "Alex");
}

void testValueModification() {
  auto result = core::Result<int>::Success(10);

  result.getValue() = 20;

  assert(result.getValue() == 20);
}

void testErrorModification() {
  auto result = core::Result<int>::Failure("old error");

  result.getError() = "new error";

  assert(result.getError() == "new error");
}

void testBasicResultWithCustomError() {
  enum class ErrorCode { NotFound, PermissionDenied };

  using CustomResult = core::BasicResult<int, ErrorCode>;

  auto result = CustomResult::Failure(ErrorCode::PermissionDenied);

  assert(result.isFailure());
  assert(result.getError() == ErrorCode::PermissionDenied);
}

void runAllTests() {
  testSuccessCreation();
  testFailureCreation();
  testStatusSuccess();
  testStatusFailure();
  testMoveConstruction();
  testMoveAssignment();
  testDifferentTypes();
  testValueModification();
  testErrorModification();
  testBasicResultWithCustomError();
}

} // namespace

int main() {
  runAllTests();
  return 0;
}