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#include <nanobind/nanobind.h>

#include <nanobind/make_iterator.h>

#include <nanobind/stl/vector.h>

#include <nanobind/stl/string.h>

#include <nanobind/stl/optional.h>

namespace nb = nanobind;

#include "pyoptinterface/cppad_interface.hpp"

using graph_op_enum = CppAD::graph::graph_op_enum;

struct cpp_graph_cursor

{

size_t op_index = 0;

size_t arg_index = 0;

};

graph_op_enum cursor_op(CppAD::cpp_graph &graph, cpp_graph_cursor &cursor)

{

return graph.operator_vec_get(cursor.op_index);

}

size_t cursor_n_arg(CppAD::cpp_graph &graph, cpp_graph_cursor &cursor)

{

auto op = cursor_op(graph, cursor);

size_t n_arg = 0;

switch (op)

{

// unary operators

case graph_op_enum::abs_graph_op:

case graph_op_enum::acos_graph_op:

case graph_op_enum::acosh_graph_op:

case graph_op_enum::asin_graph_op:

case graph_op_enum::asinh_graph_op:

case graph_op_enum::atan_graph_op:

case graph_op_enum::atanh_graph_op:

case graph_op_enum::cos_graph_op:

case graph_op_enum::cosh_graph_op:

case graph_op_enum::erf_graph_op:

case graph_op_enum::erfc_graph_op:

case graph_op_enum::exp_graph_op:

case graph_op_enum::expm1_graph_op:

case graph_op_enum::log1p_graph_op:

case graph_op_enum::log_graph_op:

case graph_op_enum::neg_graph_op:

case graph_op_enum::sign_graph_op:

case graph_op_enum::sin_graph_op:

case graph_op_enum::sinh_graph_op:

case graph_op_enum::sqrt_graph_op:

case graph_op_enum::tan_graph_op:

case graph_op_enum::tanh_graph_op:

n_arg = 1;

break;

// binary operators

case graph_op_enum::add_graph_op:

case graph_op_enum::azmul_graph_op:

case graph_op_enum::div_graph_op:

case graph_op_enum::mul_graph_op:

case graph_op_enum::pow_graph_op:

case graph_op_enum::sub_graph_op:

n_arg = 2;

break;

// conditional operators

case graph_op_enum::cexp_eq_graph_op:

case graph_op_enum::cexp_le_graph_op:

case graph_op_enum::cexp_lt_graph_op:

n_arg = 4;

break;

default: {

std::string op_name = CppAD::local::graph::op_enum2name[op];

auto message = "Unknown graph_op: " + op_name;

throw std::runtime_error(message);

}

break;

}

return n_arg;

}

void advance_graph_cursor(CppAD::cpp_graph &graph, cpp_graph_cursor &cursor)

{

auto n_arg = cursor_n_arg(graph, cursor);

cursor.arg_index += n_arg;

cursor.op_index++;

}

NB_MODULE(cppad_interface_ext, m)

{

nb::enum_<graph_op_enum>(m, "graph_op")

.value("abs", graph_op_enum::abs_graph_op)

.value("acos", graph_op_enum::acos_graph_op)

.value("acosh", graph_op_enum::acosh_graph_op)

.value("add", graph_op_enum::add_graph_op)

.value("asin", graph_op_enum::asin_graph_op)

.value("asinh", graph_op_enum::asinh_graph_op)

.value("atan", graph_op_enum::atan_graph_op)

.value("atanh", graph_op_enum::atanh_graph_op)

.value("atom4", graph_op_enum::atom4_graph_op)

.value("atom", graph_op_enum::atom_graph_op)

.value("azmul", graph_op_enum::azmul_graph_op)

.value("cexp_eq", graph_op_enum::cexp_eq_graph_op)

.value("cexp_le", graph_op_enum::cexp_le_graph_op)

.value("cexp_lt", graph_op_enum::cexp_lt_graph_op)

.value("comp_eq", graph_op_enum::comp_eq_graph_op)

.value("comp_le", graph_op_enum::comp_le_graph_op)

.value("comp_lt", graph_op_enum::comp_lt_graph_op)

.value("comp_ne", graph_op_enum::comp_ne_graph_op)

.value("cos", graph_op_enum::cos_graph_op)

.value("cosh", graph_op_enum::cosh_graph_op)

.value("discrete", graph_op_enum::discrete_graph_op)

.value("div", graph_op_enum::div_graph_op)

.value("erf", graph_op_enum::erf_graph_op)

.value("erfc", graph_op_enum::erfc_graph_op)

.value("exp", graph_op_enum::exp_graph_op)

.value("expm1", graph_op_enum::expm1_graph_op)

.value("log1p", graph_op_enum::log1p_graph_op)

.value("log", graph_op_enum::log_graph_op)

.value("mul", graph_op_enum::mul_graph_op)

.value("neg", graph_op_enum::neg_graph_op)

.value("pow", graph_op_enum::pow_graph_op)

.value("print", graph_op_enum::print_graph_op)

.value("sign", graph_op_enum::sign_graph_op)

.value("sin", graph_op_enum::sin_graph_op)

.value("sinh", graph_op_enum::sinh_graph_op)

.value("sqrt", graph_op_enum::sqrt_graph_op)

.value("sub", graph_op_enum::sub_graph_op)

.value("sum", graph_op_enum::sum_graph_op)

.value("tan", graph_op_enum::tan_graph_op)

.value("tanh", graph_op_enum::tanh_graph_op);

nb::class_<cpp_graph_cursor>(m, "cpp_graph_cursor")

.def(nb::init<>())

.def_ro("op_index", &cpp_graph_cursor::op_index)

.def_ro("arg_index", &cpp_graph_cursor::arg_index);

nb::class_<CppAD::cpp_graph>(m, "cpp_graph")

.def(nb::init<>())

.def_prop_ro("n_dynamic_ind", [](CppAD::cpp_graph &g) { return g.n_dynamic_ind_get(); })

.def_prop_ro("n_variable_ind", [](CppAD::cpp_graph &g) { return g.n_variable_ind_get(); })

.def_prop_ro("n_constant", [](CppAD::cpp_graph &g) { return g.constant_vec_size(); })

.def_prop_ro("n_dependent", [](CppAD::cpp_graph &g) { return g.dependent_vec_size(); })

.def_prop_ro("n_operator", [](CppAD::cpp_graph &g) { return g.operator_vec_size(); })

.def_prop_ro("n_operator_arg", [](CppAD::cpp_graph &g) { return g.operator_arg_size(); })

.def("constant_vec_get", &CppAD::cpp_graph::constant_vec_get)

.def("dependent_vec_get", &CppAD::cpp_graph::dependent_vec_get)

.def("__str__",

[](CppAD::cpp_graph &g) {

std::ostringstream oss;

g.print(oss);

return oss.str();

})

.def("get_cursor_op", &cursor_op)

.def("get_cursor_n_arg", &cursor_n_arg)

.def("get_cursor_args",

[](CppAD::cpp_graph &graph, cpp_graph_cursor &cursor) {

auto n_arg = cursor_n_arg(graph, cursor);

nb::list args;

for (size_t i = 0; i < n_arg; i++)

{

auto arg = graph.operator_arg_get(cursor.arg_index + i);

args.append(nb::int_(arg));

}

return args;

})

.def("next_cursor", &advance_graph_cursor);

nb::class_<ADFunDouble>(m, "ADFunDouble")

.def(nb::init<>())

.def_prop_ro("nx", [](const ADFunDouble &f) { return f.Domain(); })

.def_prop_ro("ny", [](const ADFunDouble &f) { return f.Range(); })

.def_prop_ro("np", [](const ADFunDouble &f) { return f.size_dyn_ind(); })

.def("to_graph", &ADFunDouble::to_graph);

nb::class_<CppADAutodiffGraph>(m, "CppADAutodiffGraph")

.def(nb::init<>())

.def_ro("f", &CppADAutodiffGraph::f_graph)

.def_ro("jacobian", &CppADAutodiffGraph::jacobian_graph)

.def_ro("hessian", &CppADAutodiffGraph::hessian_graph);

m.def("cppad_trace_graph_constraints", cppad_trace_graph_constraints, nb::arg("graph"),

nb::arg("selected") = std::vector<size_t>{});

m.def("cppad_trace_graph_objective", cppad_trace_graph_objective, nb::arg("graph"),

nb::arg("selected") = std::vector<size_t>{}, nb::arg("aggregate") = true);

m.def("cppad_autodiff", &cppad_autodiff);

}

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