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package com.oracle.truffle.js.test.instrumentation;

import com.oracle.truffle.js.nodes.instrumentation.JSTags;
import org.junit.Test;

public class AsyncFunctionTest extends FineGrainedAccessTest {

    @Test
    public void asyncFunctionBodyBlock() {
        assertSimpleAsyncFunction("(async function foo() { return 42; })();");
    }

    @Test
    public void asyncArrowFunctionBodyBlock() {
        assertSimpleAsyncFunction("(async () => { return 42; })();");
    }

    @Test
    public void asyncFunctionWithAwait() {
        String src = "(async function foo(v) { if (v < 1) {return await foo(v+1);} else {return 42;} })(0);";
        evalWithTags(src, new Class<?>[]{JSTags.ControlFlowRootTag.class, JSTags.ControlFlowBranchTag.class});
        // enter foo the first time
        enter(JSTags.ControlFlowRootTag.class, (e, i) -> {
            // this is the async function
            assertAttribute(e, TYPE, JSTags.ControlFlowRootTag.Type.AsyncFunction.name());
            // if statement
            enter(JSTags.ControlFlowRootTag.class, (e1, i1) -> {
                assertAttribute(e1, TYPE, JSTags.ControlFlowRootTag.Type.Conditional.name());
                // condition true
                enter(JSTags.ControlFlowBranchTag.class, (e2, i2) -> {
                    assertAttribute(e2, TYPE, JSTags.ControlFlowBranchTag.Type.Condition.name());
                    i2.input(true);
                }).exit();
                i1.input(true);
                // return statement
                enter(JSTags.ControlFlowBranchTag.class, (e4, i4) -> {
                    assertAttribute(e4, TYPE, JSTags.ControlFlowBranchTag.Type.Return.name());
                    // await
                    enter(JSTags.ControlFlowBranchTag.class, (e5, i5) -> {
                        assertAttribute(e5, TYPE, JSTags.ControlFlowBranchTag.Type.Await.name());
                        // enter foo again
                        enter(JSTags.ControlFlowRootTag.class, (e6, i6) -> {
                            assertAttribute(e, TYPE, JSTags.ControlFlowRootTag.Type.AsyncFunction.name());
                            // if statement
                            enter(JSTags.ControlFlowRootTag.class, (e7, i7) -> {
                                // condition false
                                enter(JSTags.ControlFlowBranchTag.class, (e8, i8) -> {
                                    i8.input(false);
                                }).exit();
                                i7.input(false);
                                // return 42;
                                enter(JSTags.ControlFlowBranchTag.class, (e9, i9) -> {
                                    assertAttribute(e4, TYPE, JSTags.ControlFlowBranchTag.Type.Return.name());
                                    i9.input(42);
                                }).exit();
                                i7.input(42);
                            }).exit();
                        }).exit();
                        // await got the promise, we can ignore the extra input
                        i5.input(assertJSPromiseInput);
                        i5.input(assertJSPromiseInput);
                    }).exitMaybeControlFlowException();
                }).exitMaybeControlFlowException();
            }).exitMaybeControlFlowException();
        }).exit();
        // resumed
        enter(JSTags.ControlFlowRootTag.class, (e, i) -> {
            assertAttribute(e, TYPE, JSTags.ControlFlowRootTag.Type.Conditional.name());
            enter(JSTags.ControlFlowBranchTag.class, (e1, i1) -> {
                assertAttribute(e1, TYPE, JSTags.ControlFlowBranchTag.Type.Return.name());
                enter(JSTags.ControlFlowBranchTag.class, (e2, i2) -> {
                    assertAttribute(e2, TYPE, JSTags.ControlFlowBranchTag.Type.Await.name());
                    i2.input(42);
                }).exit();
                i1.input(42);
            }).exitMaybeControlFlowException();
            i.input(42);
        }).exitMaybeControlFlowException();
    }

    private void assertSimpleAsyncFunction(String src) {
        evalWithTag(src, JSTags.ControlFlowRootTag.class);

        enter(JSTags.ControlFlowRootTag.class, (e, i) -> {
            assertAttribute(e, TYPE, JSTags.ControlFlowRootTag.Type.AsyncFunction.name());
        }).exit();
    }

}