# RUN: %PYTHON %s | FileCheck %s

import gc
from mlir.ir import *


def run(f):
    print("\nTEST:", f.__name__)
    f()
    gc.collect()
    assert Context._get_live_count() == 0


# CHECK-LABEL: TEST: testContextEnterExit
def testContextEnterExit():
    with Context() as ctx:
        assert Context.current is ctx
    assert Context.current is None


run(testContextEnterExit)


# CHECK-LABEL: TEST: testLocationEnterExit
def testLocationEnterExit():
    ctx1 = Context()
    with Location.unknown(ctx1) as loc1:
        assert Context.current is ctx1
        assert Location.current is loc1

        # Re-asserting the same context should not change the location.
        with ctx1:
            assert Context.current is ctx1
            assert Location.current is loc1
            # Asserting a different context should clear it.
            with Context() as ctx2:
                assert Context.current is ctx2
                try:
                    _ = Location.current
                except ValueError:
                    pass
                else:
                    assert False, "Expected exception"

            # And should restore.
            assert Context.current is ctx1
            assert Location.current is loc1

    # All should clear.
    try:
        _ = Location.current
    except ValueError as e:
        # CHECK: No current Location
        print(e)
    else:
        assert False, "Expected exception"


run(testLocationEnterExit)


# CHECK-LABEL: TEST: testInsertionPointEnterExit
def testInsertionPointEnterExit():
    ctx1 = Context()
    m = Module.create(Location.unknown(ctx1))
    ip = InsertionPoint(m.body)

    with ip:
        assert InsertionPoint.current is ip
        # Asserting a location from the same context should preserve.
        with Location.unknown(ctx1) as loc1:
            assert InsertionPoint.current is ip
            assert Location.current is loc1
        # Location should clear.
        try:
            _ = Location.current
        except ValueError:
            pass
        else:
            assert False, "Expected exception"

        # Asserting the same Context should preserve.
        with ctx1:
            assert InsertionPoint.current is ip

        # Asserting a different context should clear it.
        with Context() as ctx2:
            assert Context.current is ctx2
            try:
                _ = InsertionPoint.current
            except ValueError:
                pass
            else:
                assert False, "Expected exception"

    # All should clear.
    try:
        _ = InsertionPoint.current
    except ValueError as e:
        # CHECK: No current InsertionPoint
        print(e)
    else:
        assert False, "Expected exception"


run(testInsertionPointEnterExit)