/*
 * Copyright 2009 The Closure Compiler Authors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.google.debugging.sourcemap;

import com.google.debugging.sourcemap.SourceMapConsumerV2;
import com.google.debugging.sourcemap.SourceMapParseException;
import com.google.debugging.sourcemap.proto.Mapping.OriginalMapping;

import junit.framework.TestCase;

public class SourceMapConsumerV2Test extends TestCase {

  public SourceMapConsumerV2Test() {
  }

  public SourceMapConsumerV2Test(String name) {
    super(name);
  }

  public void testEmptyMap() throws Exception {
    StringBuilder sb = new StringBuilder();
    sb.append("{\n");
    sb.append("\"version\": 2,\n");
    sb.append("\"file\": \"somefile.js\",\n");
    sb.append("\"lineCount\": 0,\n");
    sb.append("\"lineMaps\": [],\n");
    sb.append("\"sources\": [],\n");
    sb.append("\"mappings\": []\n");
    sb.append("}\n");

    SourceMapConsumerV2 sourceMap = new SourceMapConsumerV2();
    sourceMap.parse(sb.toString());
  }

  public void testGetMappingForLine() throws Exception {
    // Input Code: function f(foo, bar) { foo = foo + bar + 2; return foo; }
    String mapData =
        "{\n" +
        "\"version\":2,\n" +
        "\"file\":\"testcode\",\n" +
        "\"lineCount\":1,\n" +
        "\"lineMaps\":" +
        "[\"cAEBABIBA/ICA+ADICA/ICA+IDA9AEYBMBA5\"],\n" +
        "\"sources\":[\"testcode\"],\n" +
        "\"mappings\":[[0,1,9,\"f\"],\n" +
        "[0,1,9,\"f\"],\n" +
        "[0,1,10],\n" +
        "[0,1,11,\"foo\"],\n" +
        "[0,1,16,\"bar\"],\n" +
        "[0,1,21],\n" +
        "[0,1,23],\n" +
        "[0,1,23,\"foo\"],\n" +
        "[0,1,29,\"foo\"],\n" +
        "[0,1,35,\"bar\"],\n" +
        "[0,1,41],\n" +
        "[0,1,44],\n" +
        "[0,1,51,\"foo\"],\n" +
        "]\n" +
        "}\n";

    SourceMapConsumerV2 sourceMap = new SourceMapConsumerV2();
    sourceMap.parse(mapData);

    OriginalMapping mapping = sourceMap.getMappingForLine(1, 10);

    assertNotNull(mapping);
    assertEquals("testcode", mapping.getOriginalFile());
    assertEquals(1, mapping.getLineNumber());
    assertEquals(9, mapping.getColumnPosition());
    assertEquals("f", mapping.getIdentifier());

    mapping = sourceMap.getMappingForLine(1, 40);

    assertNotNull(mapping);
    assertEquals("testcode", mapping.getOriginalFile());
    assertEquals(1, mapping.getLineNumber());
    assertEquals(44, mapping.getColumnPosition());
    assertEquals("", mapping.getIdentifier());

    mapping = sourceMap.getMappingForLine(1, 42);
    assertNotNull(mapping);
    assertEquals("testcode", mapping.getOriginalFile());
    assertEquals(1, mapping.getLineNumber());
    assertEquals(51, mapping.getColumnPosition());
    assertEquals("foo", mapping.getIdentifier());

    assertNull(sourceMap.getMappingForLine(Integer.MAX_VALUE, 1));
    assertNull(sourceMap.getMappingForLine(1, Integer.MAX_VALUE));
  }

  public void testGetMappingForLineWithNameIndex() throws Exception {
    String mapData =
        "{\n" +
        "\"version\":2,\n" +
        "\"file\":\"testcode\",\n" +
        "\"lineCount\":1,\n" +
        "\"lineMaps\":" +
        "[\"cAEBABIBA/ICA+ADICA/ICA+IDA9AEYBMBA5\"],\n" +
        "\"sources\":[\"testcode\"],\n" +
        "\"names\": [\"f\"],\n" +
        "\"mappings\":[[0,1,9,0],\n" +
        "[0,1,9,0]\n" +
        "]\n" +
        "}\n";

    SourceMapConsumerV2 sourceMap = new SourceMapConsumerV2();
    sourceMap.parse(mapData);

    OriginalMapping mapping = sourceMap.getMappingForLine(1, 10);

    assertNotNull(mapping);
    assertEquals("testcode", mapping.getOriginalFile());
    assertEquals(1, mapping.getLineNumber());
    assertEquals(9, mapping.getColumnPosition());
    assertEquals("f", mapping.getIdentifier());
  }

  public void testInvalidJSONFailure() throws Exception {
    StringBuilder sb = new StringBuilder();
    sb.append("notjson");

    assertExceptionStartsWith("JSON parse exception: org.json.JSONException: "
         + "A JSONObject text must begin "
         + "with '{' at character 1", sb);
  }

  public void testUnknownVersion() throws Exception {
    StringBuilder sb = new StringBuilder();
    sb.append("{\"version\": 3}");
    assertException("Unknown version: 3", sb);
  }

  public void testMissingFile() throws Exception {
    StringBuilder sb = new StringBuilder();
    sb.append("{\"version\": 2, \"file\": \"\"}");
    assertException("File entry is missing or empty", sb);
  }

  private void assertException(String exception, StringBuilder sb) {
    boolean exceptionRaised = false;

    try {
      SourceMapConsumerV2 sourceMap = new SourceMapConsumerV2();
      sourceMap.parse(sb.toString());

    } catch (SourceMapParseException pe) {
      assertEquals(exception, pe.getMessage());
      exceptionRaised = true;
    }

    assertTrue(exceptionRaised);
  }

  private void assertExceptionStartsWith(String exception, StringBuilder sb) {
    boolean exceptionRaised = false;

    try {
      SourceMapConsumerV2 sourceMap = new SourceMapConsumerV2();
      sourceMap.parse(sb.toString());

    } catch (SourceMapParseException pe) {
      assertTrue(
        "expected <" + exception +"> but was <"+ pe.getMessage() +">",
        pe.getMessage().startsWith(exception));
      exceptionRaised = true;
    }

    assertTrue(exceptionRaised);
  }
}