// Copyright 2015-2018 Hans Dembinski
//
// Distributed under the Boost Software License, Version 1.0.
// (See accompanying file LICENSE_1_0.txt
// or copy at http://www.boost.org/LICENSE_1_0.txt)

#include <boost/core/ignore_unused.hpp>
#include <boost/core/lightweight_test.hpp>
#include <boost/histogram/accumulators.hpp>
#include <boost/histogram/accumulators/ostream.hpp>
#include <boost/histogram/algorithm/sum.hpp>
#include <boost/histogram/axis.hpp>
#include <boost/histogram/axis/ostream.hpp>
#include <boost/histogram/histogram.hpp>
#include <boost/histogram/literals.hpp>
#include <boost/histogram/make_histogram.hpp>
#include <boost/histogram/ostream.hpp>
#include <sstream>
#include <stdexcept>
#include <tuple>
#include <utility>
#include <vector>
#include "is_close.hpp"
#include "std_ostream.hpp"
#include "throw_exception.hpp"
#include "utility_allocator.hpp"
#include "utility_axis.hpp"
#include "utility_histogram.hpp"

using namespace boost::histogram;
using namespace boost::histogram::literals; // to get _c suffix

template <class A, class S>
void pass_histogram(boost::histogram::histogram<A, S>& h) {
  BOOST_TEST_EQ(h.at(0), 0);
  BOOST_TEST_EQ(h.at(1), 1);
  BOOST_TEST_EQ(h.at(2), 0);
  BOOST_TEST_EQ(h.axis(0_c), axis::integer<>(0, 3));
}

template <class Tag>
void run_tests() {
  // init_1
  {
    auto h = make(Tag(), axis::regular<>{3, -1, 1});
    BOOST_TEST_EQ(h.rank(), 1);
    BOOST_TEST_EQ(h.size(), 5);
    BOOST_TEST_EQ(h.axis(0_c).size(), 3);
    BOOST_TEST_EQ(h.axis().size(), 3);
    auto h2 = make_s(Tag(), std::vector<unsigned>(), axis::regular<>{3, -1, 1});
    BOOST_TEST_EQ(h2, h);
  }

  // init_2
  {
    auto h = make(Tag(), axis::regular<>{3, -1, 1}, axis::integer<>{-1, 2},
                  axis::circular<>{2, 0, 360}, axis::variable<>{-1, 0, 1},
                  axis::category<>{{3, 1, 2}});
    BOOST_TEST_EQ(h.rank(), 5);
    BOOST_TEST_EQ(h.size(), 5 * 5 * 3 * 4 * 4);
    auto h2 = make_s(Tag(), std::vector<unsigned>(), axis::regular<>{3, -1, 1},
                     axis::integer<>{-1, 2}, axis::circular<>{2, 0, 360},
                     axis::variable<>{-1, 0, 1}, axis::category<>{{3, 1, 2}});
    BOOST_TEST_EQ(h2, h);
  }

  // copy_ctor
  {
    auto h = make(Tag(), axis::integer<>{0, 2}, axis::integer<>{0, 3});
    h(0, 0);
    auto h2 = decltype(h)(h);
    BOOST_TEST_EQ(h2, h);
    auto h3 =
        histogram<std::tuple<axis::integer<>, axis::integer<>>, dense_storage<double>>(h);
    BOOST_TEST_EQ(h3, h);
  }

  // copy_assign
  {
    auto h = make(Tag(), axis::integer<>(0, 1), axis::integer<>(0, 2));
    h(0, 0);
    auto h2 = decltype(h)();
    BOOST_TEST_NE(h, h2);
    h2 = h;
    BOOST_TEST_EQ(h, h2);
    auto h3 =
        histogram<std::tuple<axis::integer<>, axis::integer<>>, dense_storage<double>>();
    h3 = h;
    BOOST_TEST_EQ(h, h3);
  }

  // move
  {
    auto h = make(Tag(), axis::integer<>(0, 1), axis::integer<>(0, 2));
    h(0, 0);
    const auto href = h;
    decltype(h) h2(std::move(h));
    BOOST_TEST_EQ(algorithm::sum(h), 0);
    BOOST_TEST_EQ(h.size(), 0);
    BOOST_TEST_EQ(h2, href);
    decltype(h) h3;
    h3 = std::move(h2);
    BOOST_TEST_EQ(algorithm::sum(h2), 0);
    BOOST_TEST_EQ(h2.size(), 0);
    BOOST_TEST_EQ(h3, href);
  }

  // axis methods
  {
    auto a = make(Tag(), axis::integer<double>(1, 2, "foo"));
    BOOST_TEST_EQ(a.axis().size(), 1);
    BOOST_TEST_EQ(a.axis().bin(0).lower(), 1);
    BOOST_TEST_EQ(a.axis().bin(0).upper(), 2);
    BOOST_TEST_EQ(a.axis().metadata(), "foo");
    unsafe_access::axis(a, 0).metadata() = "bar";
    BOOST_TEST_EQ(a.axis().metadata(), "bar");

    auto b = make(Tag(), axis::integer<double>(1, 2, "foo"), axis::integer<>(1, 3));

    // check static access
    BOOST_TEST_EQ(b.axis(0_c).size(), 1);
    BOOST_TEST_EQ(b.axis(0_c).bin(0).lower(), 1);
    BOOST_TEST_EQ(b.axis(0_c).bin(0).upper(), 2);
    BOOST_TEST_EQ(b.axis(1_c).size(), 2);
    BOOST_TEST_EQ(b.axis(1_c).bin(0), 1);
    BOOST_TEST_EQ(b.axis(1_c).bin(1), 2);
    unsafe_access::axis(b, 1_c).metadata() = "bar";
    BOOST_TEST_EQ(b.axis(0_c).metadata(), "foo");
    BOOST_TEST_EQ(b.axis(1_c).metadata(), "bar");

    // check dynamic access
    BOOST_TEST_EQ(b.axis(0).size(), 1);
    BOOST_TEST_EQ(b.axis(0).bin(0).lower(), 1);
    BOOST_TEST_EQ(b.axis(0).bin(0).upper(), 2);
    BOOST_TEST_EQ(b.axis(1).size(), 2);
    BOOST_TEST_EQ(b.axis(1).bin(0), 1);
    BOOST_TEST_EQ(b.axis(1).bin(1), 2);
    BOOST_TEST_EQ(b.axis(0).metadata(), "foo");
    BOOST_TEST_EQ(b.axis(1).metadata(), "bar");
    unsafe_access::axis(b, 0).metadata() = "baz";
    BOOST_TEST_EQ(b.axis(0).metadata(), "baz");

    auto c = make(Tag(), axis::category<>({1, 2}));
    BOOST_TEST_EQ(c.axis().size(), 2);
    unsafe_access::axis(c, 0).metadata() = "foo";
    BOOST_TEST_EQ(c.axis().metadata(), "foo");
    // need to cast here for this to work with Tag == dynamic_tag, too
    const auto& ca = axis::get<axis::category<>>(c.axis());
    BOOST_TEST_EQ(ca.bin(0), 1);
    const auto& ca2 = axis::get<axis::category<>>(c.axis(0));
    BOOST_TEST_EQ(&ca2, &ca);
  }

  // equal_compare
  {
    auto a = make(Tag(), axis::integer<>(0, 2));
    auto b = make(Tag(), axis::integer<>(0, 2), axis::integer<>(0, 3));
    BOOST_TEST(a != b);
    BOOST_TEST(b != a);
    auto c = make(Tag(), axis::integer<>(0, 2));
    BOOST_TEST(b != c);
    BOOST_TEST(c != b);
    BOOST_TEST(a == c);
    BOOST_TEST(c == a);
    auto d = make(Tag(), axis::regular<>(2, 0, 1));
    BOOST_TEST(c != d);
    BOOST_TEST(d != c);
    c(0);
    BOOST_TEST(a != c);
    BOOST_TEST(c != a);
    a(0);
    BOOST_TEST(a == c);
    BOOST_TEST(c == a);
    a(0);
    BOOST_TEST(a != c);
    BOOST_TEST(c != a);
  }

  // 1D
  {
    auto h = make(Tag(), axis::integer<int, axis::null_type>{0, 2});
    h(0);
    auto i = h(0);
    BOOST_TEST(i == h.begin() + 1); // +1 because of underflow
    i = h(-1);
    BOOST_TEST(i == h.begin()); // underflow
    i = h(10);
    BOOST_TEST(i == h.end() - 1); // overflow

    BOOST_TEST_EQ(h.rank(), 1);
    BOOST_TEST_EQ(h.axis().size(), 2);
    BOOST_TEST_EQ(algorithm::sum(h), 4);

    BOOST_TEST_EQ(h.at(-1), 1);
    BOOST_TEST_EQ(h.at(0), 2);
    BOOST_TEST_EQ(h.at(1), 0);
    BOOST_TEST_EQ(h.at(2), 1);
  }

  // 1D no *flow
  {
    auto h = make(Tag(), axis::integer<int, axis::null_type, axis::option::none_t>(0, 2));
    h(0);
    auto i = h(-0);
    BOOST_TEST(i == h.begin());
    i = h(-1);
    BOOST_TEST(i == h.end());
    i = h(10);
    BOOST_TEST(i == h.end());

    BOOST_TEST_EQ(h.rank(), 1);
    BOOST_TEST_EQ(h.axis().size(), 2);
    BOOST_TEST_EQ(algorithm::sum(h), 2);

    BOOST_TEST_EQ(h.at(0), 2);
    BOOST_TEST_EQ(h.at(1), 0);
  }

  // 1D category axis
  {
    auto h = make(Tag(), axis::category<>({1, 2}));
    h(1);
    h(2);
    h(4);
    h(5);

    BOOST_TEST_EQ(h.rank(), 1);
    BOOST_TEST_EQ(h.axis().size(), 2);
    BOOST_TEST_EQ(algorithm::sum(h), 4);

    BOOST_TEST_EQ(h.at(0), 1);
    BOOST_TEST_EQ(h.at(1), 1);
    BOOST_TEST_EQ(h.at(2), 2); // overflow bin
  }

  // 1D weight
  {
    auto h = make_s(Tag(), weight_storage(), axis::integer<>(0, 2));
    h(-1);
    h(0);
    h(weight(0.5), 0);
    h(1);
    h(weight(2), 2);

    BOOST_TEST_EQ(algorithm::sum(h).value(), 5.5);
    BOOST_TEST_EQ(algorithm::sum(h).variance(), 7.25);

    BOOST_TEST_EQ(h[-1].value(), 1);
    BOOST_TEST_EQ(h[-1].variance(), 1);
    BOOST_TEST_EQ(h[0].value(), 1.5);
    BOOST_TEST_EQ(h[0].variance(), 1.25);
    BOOST_TEST_EQ(h[1].value(), 1);
    BOOST_TEST_EQ(h[1].variance(), 1);
    BOOST_TEST_EQ(h[2].value(), 2);
    BOOST_TEST_EQ(h[2].variance(), 4);
  }

  // 1D profile
  {
    auto h = make_s(Tag(), profile_storage(), axis::integer<>(0, 2));

    h(0, sample(1));
    h(0, sample(2));
    h(0, sample(3));
    h(sample(4), 1);
    h(sample(5), 1);
    h(sample(6), 1);

    BOOST_TEST_EQ(h[0].count(), 3);
    BOOST_TEST_EQ(h[0].value(), 2);
    BOOST_TEST_EQ(h[0].variance(), 1);
    BOOST_TEST_EQ(h[1].count(), 3);
    BOOST_TEST_EQ(h[1].value(), 5);
    BOOST_TEST_EQ(h[1].variance(), 1);
  }

  // 1D weighted profile
  {
    auto h = make_s(Tag(), weighted_profile_storage(), axis::integer<>(0, 2));

    h(0, sample(1));
    h(sample(1), 0);

    h(0, weight(2), sample(3));
    h(0, sample(5), weight(2));

    h(weight(2), 1, sample(1));
    h(sample(2), 1, weight(2));

    h(weight(2), sample(3), 1);
    h(sample(4), weight(2), 1);

    BOOST_TEST_EQ(h[0].sum_of_weights(), 6);
    BOOST_TEST_EQ(h[0].value(), 3);
    BOOST_TEST_EQ(h[1].sum_of_weights(), 8);
    BOOST_TEST_EQ(h[1].value(), 2.5);
  }

  // 2D
  {
    auto h = make(Tag(), axis::integer<>(-1, 1),
                  axis::integer<int, axis::null_type, axis::option::none_t>(-1, 2));
    h(-1, -1);
    h(-1, 0);
    h(-1, -10);
    h(-10, 0);

    BOOST_TEST_EQ(h.rank(), 2);
    BOOST_TEST_EQ(h.axis(0_c).size(), 2);
    BOOST_TEST_EQ(h.axis(1_c).size(), 3);
    BOOST_TEST_EQ(algorithm::sum(h), 3);

    BOOST_TEST_EQ(h.at(-1, 0), 0);
    BOOST_TEST_EQ(h.at(-1, 1), 1);
    BOOST_TEST_EQ(h.at(-1, 2), 0);

    BOOST_TEST_EQ(h.at(0, 0), 1);
    BOOST_TEST_EQ(h.at(0, 1), 1);
    BOOST_TEST_EQ(h.at(0, 2), 0);

    BOOST_TEST_EQ(h.at(1, 0), 0);
    BOOST_TEST_EQ(h.at(1, 1), 0);
    BOOST_TEST_EQ(h.at(1, 2), 0);

    BOOST_TEST_EQ(h.at(2, 0), 0);
    BOOST_TEST_EQ(h.at(2, 1), 0);
    BOOST_TEST_EQ(h.at(2, 2), 0);
  }

  // 2D weight
  {
    auto h = make_s(Tag(), weight_storage(), axis::integer<>(-1, 1),
                    axis::integer<int, axis::null_type, axis::option::none_t>(-1, 2));
    h(-1, 0);              // -> 0, 1
    h(weight(10), -1, -1); // -> 0, 0
    h(weight(5), -1, -10); // is ignored
    h(weight(7), -10, 0);  // -> -1, 1

    BOOST_TEST_EQ(algorithm::sum(h).value(), 18);
    BOOST_TEST_EQ(algorithm::sum(h).variance(), 150);

    BOOST_TEST_EQ(h.at(-1, 0).value(), 0);
    BOOST_TEST_EQ(h.at(-1, 1).value(), 7);
    BOOST_TEST_EQ(h.at(-1, 2).value(), 0);

    BOOST_TEST_EQ(h.at(0, 0).value(), 10);
    BOOST_TEST_EQ(h.at(0, 1).value(), 1);
    BOOST_TEST_EQ(h.at(0, 2).value(), 0);

    BOOST_TEST_EQ(h.at(1, 0).value(), 0);
    BOOST_TEST_EQ(h.at(1, 1).value(), 0);
    BOOST_TEST_EQ(h.at(1, 2).value(), 0);

    BOOST_TEST_EQ(h.at(2, 0).value(), 0);
    BOOST_TEST_EQ(h.at(2, 1).value(), 0);
    BOOST_TEST_EQ(h.at(2, 2).value(), 0);

    BOOST_TEST_EQ(h.at(-1, 0).variance(), 0);
    BOOST_TEST_EQ(h.at(-1, 1).variance(), 49);
    BOOST_TEST_EQ(h.at(-1, 2).variance(), 0);

    BOOST_TEST_EQ(h.at(0, 0).variance(), 100);
    BOOST_TEST_EQ(h.at(0, 1).variance(), 1);
    BOOST_TEST_EQ(h.at(0, 2).variance(), 0);

    BOOST_TEST_EQ(h.at(1, 0).variance(), 0);
    BOOST_TEST_EQ(h.at(1, 1).variance(), 0);
    BOOST_TEST_EQ(h.at(1, 2).variance(), 0);

    BOOST_TEST_EQ(h.at(2, 0).variance(), 0);
    BOOST_TEST_EQ(h.at(2, 1).variance(), 0);
    BOOST_TEST_EQ(h.at(2, 2).variance(), 0);
  }

  // 3D weight
  {
    auto h = make_s(Tag(), weight_storage(), axis::integer<>(0, 3), axis::integer<>(0, 4),
                    axis::integer<>(0, 5));
    for (auto i = 0; i < h.axis(0_c).size(); ++i)
      for (auto j = 0; j < h.axis(1_c).size(); ++j)
        for (auto k = 0; k < h.axis(2_c).size(); ++k) h(i, j, k, weight(i + j + k));

    for (auto i = 0; i < h.axis(0_c).size(); ++i) {
      for (auto j = 0; j < h.axis(1_c).size(); ++j) {
        for (auto k = 0; k < h.axis(2_c).size(); ++k) {
          BOOST_TEST_EQ(h.at(i, j, k).value(), i + j + k);
          BOOST_TEST_EQ(h.at(i, j, k).variance(), (i + j + k) * (i + j + k));
        }
      }
    }
  }

  // STL support
  {
    auto v = std::vector<int>{0, 1, 2};
    auto h = std::for_each(v.begin(), v.end(), make(Tag(), axis::integer<>(0, 3)));
    BOOST_TEST_EQ(h.at(0), 1);
    BOOST_TEST_EQ(h.at(1), 1);
    BOOST_TEST_EQ(h.at(2), 1);
    BOOST_TEST_EQ(algorithm::sum(h), 3);

    auto a = std::vector<double>();
    // walks over all bins, including underflow and overflow
    std::partial_sum(h.begin(), h.end(), std::back_inserter(a));
    BOOST_TEST_EQ(a.size(), 5);
    BOOST_TEST_EQ(a[0], 0);
    BOOST_TEST_EQ(a[1], 1);
    BOOST_TEST_EQ(a[2], 2);
    BOOST_TEST_EQ(a[3], 3);
    BOOST_TEST_EQ(a[4], 3);
  }

  // histogram reset
  {
    auto h = make(Tag(), axis::integer<int, axis::null_type, axis::option::none_t>(0, 2));
    h(0);
    h(1);
    BOOST_TEST_EQ(h.at(0), 1);
    BOOST_TEST_EQ(h.at(1), 1);
    BOOST_TEST_EQ(algorithm::sum(h), 2);
    h.reset();
    BOOST_TEST_EQ(h.at(0), 0);
    BOOST_TEST_EQ(h.at(1), 0);
    BOOST_TEST_EQ(algorithm::sum(h), 0);
  }

  // using containers for input and output
  {
    auto h = make(Tag(), axis::integer<>(0, 2), axis::integer<double>(2, 4));
    // tuple in
    h(std::make_tuple(0, 2.0));
    h(std::make_tuple(1, 3.0));

    auto i00 = std::make_tuple(0, 0);
    auto i11 = std::make_tuple(1, 1);

    // tuple out
    BOOST_TEST_EQ(h.at(i00), 1);
    BOOST_TEST_EQ(h[i00], 1);
    BOOST_TEST_EQ(h[i11], 1);

    // iterable out
    int j11[] = {1, 1};
    BOOST_TEST_EQ(h.at(j11), 1);
    BOOST_TEST_EQ(h[j11], 1);
    int j111[] = {1, 1, 1};
    (void)j111;
    BOOST_TEST_THROWS((void)h.at(j111), std::invalid_argument);
    int j13[] = {1, 3};
    (void)j13;
    BOOST_TEST_THROWS((void)h.at(j13), std::out_of_range);

    // tuple with weight
    h(std::make_tuple(weight(2), 0, 2.0));
    h(std::make_tuple(1, 3.0, weight(2)));

    BOOST_TEST_EQ(h.at(i00), 3);
    BOOST_TEST_EQ(h[i00], 3);

    // test special case of 1-dimensional histogram, which should unpack
    // 1-dimensional tuple normally, but forward larger tuples to the axis
    auto h1 = make(Tag(), axis::integer<>(0, 2));
    h1(std::make_tuple(0));                      // as if one had passed 0 directly
    BOOST_TEST_EQ(h1.at(std::make_tuple(0)), 1); // as if one had passed 0 directly
  }

  // bad bin access
  {
    auto h = make(Tag(), axis::integer<>(0, 1), axis::integer<>(0, 1));
    BOOST_TEST_THROWS(h.at(0, 2), std::out_of_range);
    BOOST_TEST_THROWS(h.at(std::make_tuple(2, 0)), std::out_of_range);
  }

  // pass histogram to function
  {
    auto h = make(Tag(), axis::integer<>(0, 3));
    h(1);
    pass_histogram(h);
  }

  // allocator support
  {
    tracing_allocator_db db;
    {
      tracing_allocator<char> a(db);
      auto h = make_s(Tag(), std::vector<int, tracing_allocator<int>>(a),
                      axis::integer<>(0, 1000));
      h(0);
    }

    // int allocation for std::vector
    BOOST_TEST_EQ(db.at<int>().first, 0);
    BOOST_TEST_EQ(db.at<int>().second, 1002);

    if (Tag()) { // axis::variant allocation, only for dynamic histogram
      using T = axis::variant<axis::integer<>>;
      BOOST_TEST_EQ(db.at<T>().first, 0);
      // may be zero if vector uses small-vector-optimisation
      BOOST_TEST_LE(db.at<T>().second, 1);
    }
  }
}

int main() {
  run_tests<static_tag>();
  run_tests<dynamic_tag>();

  return boost::report_errors();
}
