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package com.oracle.truffle.js.test;

import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertFalse;
import static org.junit.Assert.assertTrue;
import static org.junit.Assert.fail;

import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;

import org.graalvm.polyglot.Context;
import org.graalvm.polyglot.PolyglotException;
import org.graalvm.polyglot.PolyglotException.StackFrame;
import org.graalvm.polyglot.Source;
import org.graalvm.polyglot.Value;
import org.junit.Test;

import com.oracle.truffle.js.lang.JavaScriptLanguage;

public class SourceURLTest {

    @Test
    public void testSourceURL() {
        try (Context context = JSTest.newContextBuilder().build()) {
            context.eval(Source.newBuilder(JavaScriptLanguage.ID, "" +
                            "function dumpStack() { return new Error().stack; }\n" +
                            "function throwError() { throw new Error(); }",
                            "common.js").buildLiteral());

            Value result;
            result = context.eval(Source.newBuilder(JavaScriptLanguage.ID, "dumpStack(); //# sourceURL=testsource.js", "test1.js").buildLiteral());
            assertTrue(result.isString());
            assertTrue(result.asString(), result.asString().contains("testsource.js"));
            assertFalse(result.asString(), result.asString().contains("test1.js"));
            assertTrue(result.asString(), result.asString().contains("common.js"));

            result = context.eval(Source.newBuilder(JavaScriptLanguage.ID, "eval('dumpStack(); //# sourceURL=evalsource.js');", "test2.js").buildLiteral());
            assertTrue(result.isString());
            assertTrue(result.asString(), result.asString().contains("evalsource.js"));
            assertTrue(result.asString(), result.asString().contains("test2.js"));
            assertTrue(result.asString(), result.asString().contains("common.js"));

            try {
                context.eval(Source.newBuilder(JavaScriptLanguage.ID, "throwError(); //# sourceURL=testsource.js", "test3.js").buildLiteral());
                fail();
            } catch (PolyglotException e) {
                assertTrue(e.isGuestException());
                verifyGuestFrames(e, Arrays.asList("common.js", "testsource.js"));
            }
        }
    }

    @Test
    public void testSourceURLInternal() {
        try (Context context = JSTest.newContextBuilder().build()) {
            context.eval(Source.newBuilder(JavaScriptLanguage.ID, "" +
                            "function dumpStack() { return new Error().stack; }\n" +
                            "function throwError() { throw new Error(); }",
                            "common.js").buildLiteral());

            Value result;
            result = context.eval(Source.newBuilder(JavaScriptLanguage.ID, "dumpStack(); //# sourceURL=internal:testsource.js", "test1.js").buildLiteral());
            assertTrue(result.isString());
            assertFalse(result.asString(), result.asString().contains("testsource.js"));
            assertFalse(result.asString(), result.asString().contains("test1.js"));
            assertTrue(result.asString(), result.asString().contains("common.js"));

            result = context.eval(Source.newBuilder(JavaScriptLanguage.ID, "eval('dumpStack(); //# sourceURL=internal:evalsource.js');", "test2.js").buildLiteral());
            assertTrue(result.isString());
            assertFalse(result.asString(), result.asString().contains("evalsource.js"));
            assertTrue(result.asString(), result.asString().contains("test2.js"));
            assertTrue(result.asString(), result.asString().contains("common.js"));

            try {
                context.eval(Source.newBuilder(JavaScriptLanguage.ID, "throwError(); //# sourceURL=internal:testsource.js", "test3.js").buildLiteral());
                fail();
            } catch (PolyglotException e) {
                assertTrue(e.isGuestException());
                verifyGuestFrames(e, Arrays.asList("common.js"));
            }
        }
    }

    private static void verifyGuestFrames(PolyglotException e, List<String> expectedNames) {
        List<PolyglotException.StackFrame> stack = new ArrayList<>();
        for (StackFrame stackFrame : e.getPolyglotStackTrace()) {
            if (stackFrame.isGuestFrame()) {
                stack.add(stackFrame);
            }
        }
        assertEquals(stack.toString(), expectedNames.size(), stack.size());
        for (int i = 0; i < expectedNames.size(); i++) {
            String sourceName = stack.get(i).getSourceLocation().getSource().getName();
            assertEquals(sourceName, expectedNames.get(i), sourceName);
        }
    }
}