/******************************************************************************
The MIT License(MIT)

Embedded Template Library.
https://github.com/ETLCPP/etl
https://www.etlcpp.com

Copyright(c) 2025 BMW AG, John Wellbelove

Permission is hereby granted, free of charge, to any person obtaining a copy
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******************************************************************************/

#include "unit_test_framework.h"

#include "etl/closure.h"
#include "etl/inplace_function.h"

#include <stdexcept>

namespace
{
  SUITE(test_closure_with_inplace_function)
  {
    int f1(int a1)
    {
      return a1 * 3;
    }

    int f1_throwing(int)
    {
      throw std::runtime_error("throwing function");
    }

    void f1_void(int) {}

    int f1_ref(int& a1)
    {
      return a1 * 3;
    }

    int f2(int a1, int a2)
    {
      return a1 * 3 + a2;
    }

    int f3(int a1, int a2, int a3)
    {
      return a1 * 3 + a2 * a3;
    }

    int f4(int a1, int a2, int a3, int a4)
    {
      return a1 * 3 + a2 * a3 + a4;
    }

    int f5(int a1, int a2, int a3, int a4, int a5)
    {
      return a1 * 3 + a2 * a3 + a4 * a5;
    }

    using f1_type      = int(int);
    using f1_ref_type  = int(int&);
    using f1_void_type = void(int);
    using f2_type      = int(int, int);
    using f3_type      = int(int, int, int);
    using f4_type      = int(int, int, int, int);
    using f5_type      = int(int, int, int, int, int);

    using ipf1_type      = etl::inplace_function<f1_type>;
    using ipf1_ref_type  = etl::inplace_function<f1_ref_type>;
    using ipf1_void_type = etl::inplace_function<f1_void_type>;
    using ipf2_type      = etl::inplace_function<f2_type>;
    using ipf3_type      = etl::inplace_function<f3_type>;
    using ipf4_type      = etl::inplace_function<f4_type>;
    using ipf5_type      = etl::inplace_function<f5_type>;

    ipf1_type      ipf1          = ipf1_type::create<&f1>();
    ipf1_type      ipf1_throwing = ipf1_type::create<&f1_throwing>();
    ipf1_ref_type  ipf1_ref      = ipf1_ref_type::create<&f1_ref>();
    ipf1_void_type ipf1_void     = ipf1_void_type::create<&f1_void>();
    ipf2_type      ipf2          = ipf2_type::create<&f2>();
    ipf3_type      ipf3          = ipf3_type::create<&f3>();
    ipf4_type      ipf4          = ipf4_type::create<&f4>();
    ipf5_type      ipf5          = ipf5_type::create<&f5>();

    //*************************************************************************
    TEST(test_1_arg)
    {
      etl::closure<f1_type, ipf1_type> c1(ipf1, 4);
      CHECK_EQUAL(12, c1());
    }

    //*************************************************************************
    TEST(test_1_arg_reference)
    {
      int                                      v1 = 4;
      etl::closure<f1_ref_type, ipf1_ref_type> c1_ref(ipf1_ref, v1);
      CHECK_EQUAL(12, c1_ref());
      v1 = 5;
      CHECK_EQUAL(15, c1_ref());
    }

    //*************************************************************************
    TEST(test_1_arg_lambda)
    {
      auto l = [](int a)
      {
        return a + 11;
      };
      ipf1_type ipf1_lambda(l);

      etl::closure<f1_type, ipf1_type> c1_lambda(ipf1_lambda, 5);
      CHECK_EQUAL(16, c1_lambda());
    }

    //*************************************************************************
    TEST(test_throwing)
    {
      etl::closure<f1_type, ipf1_type> c1(ipf1_throwing, 4);
      CHECK_THROW(c1(), std::runtime_error);
    }

    //*************************************************************************
    TEST(test_void)
    {
      etl::closure<f1_void_type, ipf1_void_type> c1(ipf1_void, 4);
      c1();
    }

    //*************************************************************************
    TEST(test_2_args)
    {
      etl::closure<f2_type, ipf2_type> c2(ipf2, 4, 3);
      CHECK_EQUAL(15, c2());
    }

#if ETL_USING_CPP11 && !defined(ETL_CLOSURE_FORCE_CPP03_IMPLEMENTATION)
    //*************************************************************************
    TEST(test_2_args_bind)
    {
      etl::closure<f2_type, ipf2_type> c2(ipf2, 4, 3);
      CHECK_EQUAL(15, c2());

      c2.bind<0>(7);
      c2.bind<1>(8);
      CHECK_EQUAL(29, c2());
    }

    //*************************************************************************
    TEST(test_2_args_bind_all)
    {
      etl::closure<f2_type, ipf2_type> c2(ipf2, 4, 3);
      CHECK_EQUAL(15, c2());

      c2.bind(7, 8);
      CHECK_EQUAL(29, c2());
    }
#endif

    //*************************************************************************
    TEST(test_3_args)
    {
      etl::closure<f3_type, ipf3_type> c3(ipf3, 4, 3, 2);
      CHECK_EQUAL(18, c3());
    }

    //*************************************************************************
    TEST(test_4_args)
    {
      etl::closure<f4_type, ipf4_type> c4(ipf4, 4, 3, 2, 1);
      CHECK_EQUAL(19, c4());
    }

    //*************************************************************************
    TEST(test_5_args)
    {
      etl::closure<f5_type, ipf5_type> c5(ipf5, 4, 3, 2, 1, 5);
      CHECK_EQUAL(23, c5());
    }

    //*************************************************************************
    TEST(test_bind_static_assert)
    {
      etl::closure<f2_type, ipf2_type> c(ipf2, 1, 2);

      // Uncomment to generate static_assert errors.
      // c.bind(1);                // Argument count mismatch
      // c.bind(1, 2, 3);          // Argument count mismatch
      // c.bind(1, std::string()); // Argument is not convertible
    }
  }
} // namespace