/*
Copyright (c) 2013 Microsoft Corporation. All rights reserved.
Released under Apache 2.0 license as described in the file LICENSE.

Author: Leonardo de Moura
*/
#include "util/test.h"
#include "util/exception.h"
#include "util/trace.h"
#include "kernel/kernel_exception.h"
#include "kernel/environment.h"
#include "kernel/type_checker.h"
#include "kernel/builtin.h"
#include "kernel/normalizer.h"
#include "kernel/abstract.h"
#include "library/printer.h"
#include "library/arith/arith.h"
#include "library/all/all.h"
using namespace lean;

static void tst1() {
    environment env;
    level u = env.add_uvar("u", level() + 1);
    level w = env.add_uvar("w", u + 1);
    lean_assert(!env.has_children());
    lean_assert(!env.has_parent());
    {
        environment child = env.mk_child();
        lean_assert(child.is_ge(w, u));
        lean_assert(child.is_ge(w, level() + 2));
        lean_assert(env.is_ge(w, level() + 2));
        lean_assert(env.has_children());
        lean_assert(child.has_parent());
        lean_assert(!env.has_parent());
        try {
            level o = env.add_uvar("o", w + 1);
            lean_unreachable();
        } catch (exception const & ex) {
            std::cout << "expected error: " << ex.what() << "\n";
        }
    }
    std::cout << "tst1 checkpoint" << std::endl;
    level o = env.add_uvar("o", w + 1);
    lean_assert(!env.has_children());
    std::cout << env;
}

static environment mk_child() {
    environment env;
    level u = env.add_uvar("u", level() + 1);
    return env.mk_child();
}

static void tst2() {
    environment child = mk_child();
    lean_assert(child.has_parent());
    lean_assert(!child.has_children());
    environment parent = child.parent();
    std::cout << parent;
    lean_assert(parent.has_children());
    std::cout << "uvar: " << child.get_uvar("u") << "\n";
}

static void tst3() {
    environment env = mk_toplevel();
    try {
        env.add_definition("a", Int, Const("a"));
        lean_unreachable();
    } catch (exception const & ex) {
        std::cout << "expected error: " << ex.what() << "\n";
    }
    env.add_definition("a", Int, iAdd(iVal(1), iVal(2)));
    std::cout << env << "\n";
    expr t = iAdd(Const("a"), iVal(1));
    std::cout << t << " --> " << normalize(t, env) << "\n";
    lean_assert(normalize(t, env) == iVal(4));
    env.add_definition("b", Int, iMul(iVal(2), Const("a")));
    std::cout << "b --> " << normalize(Const("b"), env) << "\n";
    lean_assert(normalize(Const("b"), env) == iVal(6));
    try {
        env.add_definition("c", mk_arrow(Int, Int), Const("a"));
        lean_unreachable();
    } catch (exception const & ex) {
        std::cout << "expected error: " << ex.what() << "\n";
    }
    try {
        env.add_definition("a", Int, iVal(10));
        lean_unreachable();
    } catch (exception const & ex) {
        std::cout << "expected error: " << ex.what() << "\n";
    }
    environment c_env = env.mk_child();
    try {
        env.add_definition("c", Int, Const("a"));
        lean_unreachable();
    } catch (exception const & ex) {
        std::cout << "expected error: " << ex.what() << "\n";
    }
    lean_assert(normalize(Const("b"), env) == iVal(6));
    lean_assert(normalize(Const("b"), c_env) == iVal(6));
    c_env.add_definition("c", Int, Const("a"));
    lean_assert(normalize(Const("c"), c_env) == iVal(3));
    try {
        expr r = normalize(Const("c"), env);
        lean_assert(r == iVal(3));
        lean_unreachable();
    } catch (exception const & ex) {
        std::cout << "expected error: " << ex.what() << std::endl;
    }
    std::cout << "end tst3" << std::endl;
}

static void tst4() {
    environment env = mk_toplevel();
    env.add_definition("a", Int, iVal(1), true); // add opaque definition
    expr t = iAdd(Const("a"), iVal(1));
    std::cout << t << " --> " << normalize(t, env) << "\n";
    lean_assert(normalize(t, env) == t);
    env.add_definition("b", Int, iAdd(Const("a"), iVal(1)));
    expr t2 = iSub(Const("b"), iVal(9));
    std::cout << t2 << " --> " << normalize(t2, env) << "\n";
    lean_assert(normalize(t2, env) == iAdd(iAdd(Const("a"), iVal(1)), iVal(-9)));
}

static void tst5() {
    environment env = mk_toplevel();
    env.add_definition("a", Int, iVal(1), true); // add opaque definition
    try {
        std::cout << infer_type(iAdd(Const("a"), Int), env) << "\n";
        lean_unreachable();
    } catch (exception const & ex) {
        std::cout << "expected error: " << ex.what() << "\n";
    }
}

static void tst6() {
    environment env = mk_toplevel();
    level u = env.add_uvar("u", level() + 1);
    level w = env.add_uvar("w", u + 1);
    env.add_var("f", mk_arrow(Type(u), Type(u)));
    expr t = Const("f")(Int);
    std::cout << "type of " << t << " is " << infer_type(t, env) << "\n";
    try {
        infer_type(Const("f")(Type(w)), env);
        lean_unreachable();
    } catch (exception const & ex) {
        std::cout << "expected error: " << ex.what() << "\n";
    }
    try {
        infer_type(Const("f")(Type(u)), env);
        lean_unreachable();
    } catch (exception const & ex) {
        std::cout << "expected error: " << ex.what() << "\n";
    }
    t = Const("f")(Type());
    std::cout << "type of " << t << " is " << infer_type(t, env) << "\n";
    std::cout << infer_type(mk_arrow(Type(u), Type(w)), env) << "\n";
    lean_assert(infer_type(mk_arrow(Type(u), Type(w)), env) == Type(max(u+1, w+1)));
    std::cout << infer_type(mk_arrow(Int, Int), env) << "\n";
    lean_assert(infer_type(mk_arrow(Int, Int), env) == Type());
}

static void tst7() {
    environment env = mk_toplevel();
    env.add_var("a", Int);
    env.add_var("b", Int);
    expr t = If(Int, True, Const("a"), Const("b"));
    std::cout << t << " --> " << normalize(t, env) << "\n";
    std::cout << infer_type(t, env) << "\n";
    std::cout << "Environment\n" << env;
}

static void tst8() {
    environment env;
    std::cout << "=======================\n";
    env.add_var("a", Type());
    env.add_var("b", Type());
    environment env2 = env.mk_child();
    env2.add_var("c", Type());
    env2.add_var("d", Type());
    env2.add_var("e", Type());
    unsigned counter = 0;
    std::for_each(env2.begin_local_objects(), env2.end_local_objects(), [&](object const & obj) { std::cout << obj.keyword() << " " << obj.get_name() << "\n"; counter++; });
    lean_assert(counter == 3);
    std::cout << "=======================\n";
    counter = 0;
    std::for_each(env2.begin_objects(), env2.end_objects(), [&](object const & obj) { std::cout << obj.keyword() << " " << obj.get_name() << "\n"; counter++; });
    lean_assert(counter == 5);
    environment env3 = env2.mk_child();
    env3.add_var("f", Type() >> Type());
    std::cout << "=======================\n";
    counter = 0;
    std::for_each(env3.begin_objects(), env3.end_objects(), [&](object const & obj) { std::cout << obj.keyword() << " " << obj.get_name() << "\n"; counter++; });
    lean_assert(counter == 6);
}

static void tst9() {
    try {
        environment env;
        env.add_uvar("u1", level());
        env.add_uvar("u2", level());
        env.add_uvar("u1", level("u2"));
    } catch (already_declared_exception & ex) {
        std::cout << ex.what() << "\n";
        level l = ex.get_environment().get_uvar(ex.get_name());
        std::cout << l << "\n";
    }
}

int main() {
    enable_trace("is_convertible");
    tst1();
    tst2();
    tst3();
    tst4();
    tst5();
    tst6();
    tst7();
    tst8();
    tst9();
    return has_violations() ? 1 : 0;
}