/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */

/* $Rev$ $Date$ */

/**
 * Test Python script evaluator.
 */

#include <assert.h>
#include "stream.hpp"
#include "string.hpp"
#include "driver.hpp"
#include "parallel.hpp"
#include "perf.hpp"

namespace tuscany {
namespace python {

const string testPythonAdd =
        "def add(x, y):\n"
        "    return x + y\n";

bool testEvalExpr() {
    gc_scoped_pool pool;
    PythonRuntime py;

    istringstream is(testPythonAdd);
    failable<PyObject*> script = readScript("script", "script.py", is, py);
    assert(hasContent(script));

    const value exp = mklist<value>("add", 2, 3);
    const failable<value> r = evalScript(exp, content(script), py);
    assert(hasContent(r));
    assert(content(r) == value(5));

    releaseScript(content(script), py);
    return true;
}

const value mult(const list<value>& args) {
    const double x = car(args);
    const double y = cadr(args);
    return x * y;
}

const string testReturnLambda(
  "def mul(x, y):\n"
  "    return x * y\n"
  "\n"
  "def testReturnLambda():\n"
  "    return mul\n");

const string testCallLambda(
  "def testCallLambda(l, x, y):\n"
  "    return l(x, y)\n");

bool testEvalLambda() {
    gc_scoped_pool pool;
    PythonRuntime py;

    const value trl = mklist<value>("testReturnLambda");
    istringstream trlis(testReturnLambda);
    const failable<value> trlv = evalScript(trl, trlis, py);

    assert(hasContent(trlv));
    assert(isLambda(content(trlv)));
    const lambda<value(const list<value>&)> trll(content(trlv));
    assert(trll(mklist<value>(2, 3)) == value(6));

    istringstream tclis(testCallLambda);
    const value tcl = mklist<value>("testCallLambda", content(trlv), 2, 3);
    const failable<value> tclv = evalScript(tcl, tclis, py);
    assert(hasContent(tclv));
    assert(content(tclv) == value(6));

    istringstream tcelis(testCallLambda);
    const value tcel = mklist<value>("testCallLambda", lambda<value(const list<value>&)>(mult), 3, 4);
    const failable<value> tcelv = evalScript(tcel, tcelis, py);
    assert(hasContent(tcelv));
    assert(content(tcelv) == value(12));
    return true;
}

struct testEvalReadAdd {
    PythonRuntime& py;
    testEvalReadAdd(PythonRuntime& py) : py(py) {
    }
    const bool operator()() const {
        istringstream is(testPythonAdd);
        failable<PyObject*> script = readScript("script", "script.py", is, py);
        assert(hasContent(script));

        const value exp = mklist<value>("add", 2, 3);
        const failable<value> r = evalScript(exp, content(script), py);
        assert(hasContent(r));
        assert(content(r) == value(5));

        releaseScript(content(script), py);
        return true;
    }
};

struct testEvalAdd {
    PyObject* script;
    PythonRuntime& py;
    testEvalAdd(PyObject* script, PythonRuntime& py) : script(script), py(py) {
    }
    const bool operator()() const {
        const value exp = mklist<value>("add", 2, 3);
        const failable<value> r = evalScript(exp, script, py);
        assert(hasContent(r));
        assert(content(r) == value(5));
        return true;
    }
};

bool testEvalPerf() {
    gc_scoped_pool pool;
    PythonRuntime py;

    const lambda<bool()> erl = lambda<bool()>(testEvalReadAdd(py));
    cout << "Python read + eval test " << time(erl, 5, 10000) << " ms" << endl;

    istringstream is(testPythonAdd);
    failable<PyObject*> script = readScript("script", "script.py", is, py);
    assert(hasContent(script));

    const lambda<bool()> el = lambda<bool()>(testEvalAdd(content(script), py));
    cout << "Python eval test " << time(el, 5, 10000) << " ms" << endl;

    releaseScript(content(script), py);
    return true;
}

#ifdef WANT_THREADS

struct testReadEvalAddLoop {
    PythonRuntime& py;
    testReadEvalAddLoop(PythonRuntime& py) : py(py) {
    }
    const bool operator()() const {
        for (int i = 0; i < 100; i++) {
            istringstream is(testPythonAdd);
            failable<PyObject*> script = readScript("script", "script.py", is, py);
            assert(hasContent(script));

            const value exp = mklist<value>("add", 2, 3);
            const failable<value> r = evalScript(exp, content(script), py);
            assert(hasContent(r));
            assert(content(r) == value(5));

            releaseScript(content(script), py);
        }
        return true;
    }
};

struct testEvalAddLoop {
    PyObject* script;
    PythonRuntime& py;
    testEvalAddLoop(PyObject* script, PythonRuntime& py) : script(script), py(py) {
    }
    const bool operator()() const {
        for (int i = 0; i < 100; i++) {
            const value exp = mklist<value>("add", 2, 3);
            const failable<value> r = evalScript(exp, script, py);
            assert(hasContent(r));
            assert(content(r) == value(5));
        }
        return true;
    }
};

const list<future<bool> > submitReadEvals(worker& w, const int max, const int i, PythonRuntime& py) {
    if (i == max)
        return list<future<bool> >();
    const lambda<bool()> func = lambda<bool()>(testReadEvalAddLoop(py));
    return cons(submit(w, func), submitReadEvals(w, max, i + 1, py));
}

const list<future<bool> > submitEvals(worker& w, const int max, const int i, PyObject* script, PythonRuntime& py) {
    if (i == max)
        return list<future<bool> >();
    const lambda<bool()> func = lambda<bool()>(testEvalAddLoop(script, py));
    return cons(submit(w, func), submitEvals(w, max, i + 1, script, py));
}

bool checkEvalResults(const list<future<bool> > r) {
    if (isNil(r))
        return true;
    assert(car(r) == true);
    return checkEvalResults(cdr(r));
}

struct testReadEvalThreads {
    worker& w;
    const int max;
    PythonRuntime& py;
    testReadEvalThreads(worker& w, const int max, PythonRuntime& py) : w(w), max(max), py(py) {
    }
    const bool operator()() const {
        const list<future<bool> > r(submitReadEvals(w, max, 0, py));
        checkEvalResults(r);
        return true;
    }
};

struct testEvalThreads {
    worker& w;
    const int max;
    PyObject* script;
    PythonRuntime& py;
    testEvalThreads(worker& w, const int max, PyObject* script, PythonRuntime& py) : w(w), max(max), script(script), py(py) {
    }
    const bool operator()() const {
        const list<future<bool> > r(submitEvals(w, max, 0, script, py));
        checkEvalResults(r);
        return true;
    }
};

bool testThreads() {
    gc_scoped_pool pool;
    PythonRuntime py;

    const int max = 100;
    worker w(max);

    const lambda<bool()> elr = lambda<bool()>(testReadEvalThreads(w, max, py));
    cout << "Python eval + read thread test " << time(elr, 1, 1) / 10000.0 << " ms" << endl;

    istringstream is(testPythonAdd);
    failable<PyObject*> script = readScript("script", "script.py", is, py);
    assert(hasContent(script));

    const lambda<bool()> el = lambda<bool()>(testEvalThreads(w, max, content(script), py));
    cout << "Python eval thread test " << time(el, 1, 1) / 10000.0 << " ms" << endl;

    releaseScript(content(script), py);
    return true;
}

#endif

}
}

int main() {
    tuscany::cout << "Testing..." << tuscany::endl;

    tuscany::python::testEvalExpr();
    tuscany::python::testEvalLambda();
    tuscany::python::testEvalPerf();
#ifdef WANT_THREADS
    tuscany::python::testThreads();
#endif

    tuscany::cout << "OK" << tuscany::endl;
    return 0;
}