class Osqp < Formula
  desc "Operator splitting QP solver"
  homepage "https://osqp.org/"
  url "https://github.com/oxfordcontrol/osqp/archive/v0.5.0.tar.gz"
  sha256 "e0932d1f7bc56dbe526bee4a81331c1694d94c570f8ac6a6cb413f38904e0f64"

  bottle do
    cellar :any
    sha256 "02787f8c20cbfa8f8c36cdead8e7a14bc32512bce34cc4c3e7d8c4961e2c9c68" => :mojave
    sha256 "563a972e1ba486955b23830bfa9c19772f73fa71cfbf7022dc846e0e55681243" => :high_sierra
    sha256 "1f647ffcc9b71eac3f9db3d2221af3da0a5f31c06b90f731d4dcf2e015281df5" => :sierra
  end

  depends_on "cmake" => [:build, :test]

  resource "qdldl" do
    url "https://github.com/oxfordcontrol/qdldl/archive/v0.1.3.tar.gz"
    sha256 "a2c3a7d0c6a48b2fab7400fa8ca72a34fb1e3a19964b281c73564178f97afe54"
  end

  def install
    # Install qdldl git submodule not included in release source archive.
    (buildpath/"lin_sys/direct/qdldl/qdldl_sources").install resource("qdldl")

    args = *std_cmake_args + %w[
      -DENABLE_MKL_PARDISO=OFF
    ]

    mkdir "build" do
      system "cmake", *args, ".."
      system "make"
      system "make", "install"
    end

    # Remove unnecessary qdldl install.
    rm_rf include/"qdldl"
    rm_rf lib/"cmake/qdldl"
    rm lib/"libqdldl.a"
    rm lib/"libqdldl.dylib"
  end

  test do
    (testpath/"CMakeLists.txt").write <<~EOS
      cmake_minimum_required(VERSION 3.2 FATAL_ERROR)
      project(osqp_demo LANGUAGES C)
      find_package(osqp CONFIG REQUIRED)
      add_executable(osqp_demo osqp_demo.c)
      target_link_libraries(osqp_demo PRIVATE osqp::osqp)
      add_executable(osqp_demo_static osqp_demo.c)
      target_link_libraries(osqp_demo_static PRIVATE osqp::osqpstatic)
    EOS
    (testpath/"osqp_demo.c").write <<~EOS
      #include <assert.h>
      #include <osqp.h>
      int main() {
        c_float P_x[4] = {4.0, 1.0, 1.0, 2.0};
        c_int P_nnz = 4;
        c_int P_i[4] = {0, 1, 0, 1};
        c_int P_p[3] = {0, 2, 4};
        c_float q[2] = {1.0, 1.0};
        c_float A_x[4] = {1.0, 1.0, 1.0, 1.0};
        c_int A_nnz = 4;
        c_int A_i[4] = {0, 1, 0, 2};
        c_int A_p[3] = {0, 2, 4};
        c_float l[3] = {1.0, 0.0, 0.0};
        c_float u[3] = {1.0, 0.69999999999999995559, 0.69999999999999995559};
        c_int n = 2;
        c_int m = 3;
        OSQPSettings *settings = (OSQPSettings *)c_malloc(sizeof(OSQPSettings));
        OSQPWorkspace *workspace;
        OSQPData *data;
        data = (OSQPData *)c_malloc(sizeof(OSQPData));
        data->n = n;
        data->m = m;
        data->P = csc_matrix(data->n, data->n, P_nnz, P_x, P_i, P_p);
        data->q = q;
        data->A = csc_matrix(data->m, data->n, A_nnz, A_x, A_i, A_p);
        data->l = l;
        data->u = u;
        osqp_set_default_settings(settings);
        workspace = osqp_setup(data, settings);
        assert(workspace != OSQP_NULL);
        osqp_solve(workspace);
        assert(workspace->info->status_val == OSQP_SOLVED);
        osqp_cleanup(workspace);
        c_free(data->A);
        c_free(data->P);
        c_free(data);
        c_free(settings);
        return 0;
      }
    EOS
    system "cmake", "."
    system "make"
    system "./osqp_demo"
    system "./osqp_demo_static"
  end
end