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

import org.junit.Test;

import com.oracle.truffle.js.nodes.instrumentation.JSTags.ControlFlowBlockTag;
import com.oracle.truffle.js.nodes.instrumentation.JSTags.ControlFlowBranchTag;
import com.oracle.truffle.js.nodes.instrumentation.JSTags.ControlFlowRootTag;
import com.oracle.truffle.js.nodes.instrumentation.JSTags.LiteralTag;
import com.oracle.truffle.js.nodes.instrumentation.JSTags.WritePropertyTag;

public class IfStatementTest extends FineGrainedAccessTest {

    @Test
    public void basicNoBranch() {
        evalAllTags("if (!true) {};");

        enter(ControlFlowRootTag.class, (e1, ifbody) -> {
            assertAttribute(e1, TYPE, ControlFlowRootTag.Type.Conditional.name());
            // condition
            enter(ControlFlowBranchTag.class, (e2, ifstatement) -> {
                assertAttribute(e2, TYPE, ControlFlowBranchTag.Type.Condition.name());

                enter(LiteralTag.class).exit();
                ifstatement.input(false);
            }).exit(assertReturnValue(false));
            ifbody.input(false);
            // no branch is executed; body returns
        }).exit();
    }

    @Test
    public void basicBranch() {
        evalAllTags("if (true) { 3; };");

        enter(ControlFlowRootTag.class, (e1, ifbody) -> {
            assertAttribute(e1, TYPE, ControlFlowRootTag.Type.Conditional.name());
            // condition
            enter(ControlFlowBranchTag.class, (e2, ifstatement) -> {
                assertAttribute(e2, TYPE, ControlFlowBranchTag.Type.Condition.name());

                enter(LiteralTag.class).exit();
                ifstatement.input(true);
            }).exit(assertReturnValue(true));
            ifbody.input(true);
            // enter if branch
            enter(ControlFlowBlockTag.class, (e2, b) -> {
                enter(LiteralTag.class).exit(assertReturnValue(3));
            }).exit();
            ifbody.input(3);
        }).exit();
    }

    @Test
    public void basicFilter() {
        evalIfBlock("if (true) { 3; };", true, 3);
    }

    @Test
    public void writeWithTernary() {
        String src = "var a = {x:0}; a.x = 100 > 0 ? 1 : 0;";
        evalWithTag(src, WritePropertyTag.class);

        enter(WritePropertyTag.class, (e1, pw1) -> {
            assertAttribute(e1, KEY, "a");
            pw1.input(assertGlobalObjectInput);
            pw1.input(assertJSObjectInput);
        }).exit();
        enter(WritePropertyTag.class, (e1, pw1) -> {
            assertAttribute(e1, KEY, "x");
            pw1.input(assertJSObjectInput);
            pw1.input(1);
        }).exit();
    }

    @Test
    public void testDesugarNeq() {
        evalIfBlock("if (42 != 41) { 42; } else { false; };", false, 42);
    }

    @Test
    public void testDesugarStrictNeq() {
        evalIfBlock("if (42 !== 41) { 42; } else { false; };", false, 42);
    }

    private void evalIfBlock(String src, Object condition, Object blockReturns) {
        evalWithTags(src, new Class[]{ControlFlowRootTag.class, ControlFlowBlockTag.class, ControlFlowBranchTag.class},
                        new Class[]{});

        enter(ControlFlowRootTag.class, (e1) -> {
            assertAttribute(e1, TYPE, ControlFlowRootTag.Type.Conditional.name());
            // condition
            enter(ControlFlowBranchTag.class, (e) -> {
                assertAttribute(e, TYPE, ControlFlowBranchTag.Type.Condition.name());
            }).exit(assertReturnValue(condition));
            // enter if branch
            enter(ControlFlowBlockTag.class).exit(assertReturnValue(blockReturns));
        }).exit();
    }
}