/*
 * Copyright 2011 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.common.collect.Lists;
import com.google.common.collect.Maps;
import com.google.javascript.jscomp.SourceMap;
import com.google.javascript.jscomp.SourceMap.Format;

import java.io.IOException;
import java.io.StringWriter;
import java.util.LinkedHashMap;
import java.util.List;


/**
 * @author johnlenz@google.com (John Lenz)
 */
public class SourceMapGeneratorV3Test extends SourceMapTestCase {

  public SourceMapGeneratorV3Test() {
  }

  @Override
  protected SourceMapConsumer getSourceMapConsumer() {
    return new SourceMapConsumerV3();
  }

  @Override
  protected Format getSourceMapFormat() {
    return SourceMap.Format.V3;
  }

  public void testBasicMapping1() throws Exception {
    compileAndCheck("function __BASIC__() { }");
  }

  public void testBasicMappingGoldenOutput() throws Exception {
    // Empty source map test
    checkSourceMap("function __BASIC__() { }",

                   "{\n" +
                   "\"version\":3,\n" +
                   "\"file\":\"testcode\",\n" +
                   "\"lineCount\":1,\n" +
                   "\"mappings\":\"AAAAA,QAASA,UAAS,EAAG;\",\n" +
                   "\"sources\":[\"testcode\"],\n" +
                   "\"names\":[\"__BASIC__\"]\n" +
                   "}\n");
  }

  public void testBasicMapping2() throws Exception {
    compileAndCheck("function __BASIC__(__PARAM1__) {}");
  }

  public void testLiteralMappings() throws Exception {
    compileAndCheck("function __BASIC__(__PARAM1__, __PARAM2__) { " +
                    "var __VAR__ = '__STR__'; }");
  }

  public void testLiteralMappingsGoldenOutput() throws Exception {
    // Empty source map test
    checkSourceMap("function __BASIC__(__PARAM1__, __PARAM2__) { " +
                   "var __VAR__ = '__STR__'; }",

                   "{\n" +
                   "\"version\":3,\n" +
                   "\"file\":\"testcode\",\n" +
                   "\"lineCount\":1,\n" +
                   "\"mappings\":\"AAAAA,QAASA,UAAS,CAACC,UAAD,CAAaC,UAAb," +
                       "CAAyB,CAAE,IAAIC,QAAU,SAAhB;\",\n" +
                   "\"sources\":[\"testcode\"],\n" +
                   "\"names\":[\"__BASIC__\",\"__PARAM1__\",\"__PARAM2__\"," +
                       "\"__VAR__\"]\n" +
                   "}\n");
  }

  public void testMultilineMapping() throws Exception {
    compileAndCheck("function __BASIC__(__PARAM1__, __PARAM2__) {\n" +
                    "var __VAR__ = '__STR__';\n" +
                    "var __ANO__ = \"__STR2__\";\n" +
                    "}");
  }

  public void testMultilineMapping2() throws Exception {
    compileAndCheck("function __BASIC__(__PARAM1__, __PARAM2__) {\n" +
                    "var __VAR__ = 1;\n" +
                    "var __ANO__ = 2;\n" +
                    "}");
  }

  public void testMultiFunctionMapping() throws Exception {
    compileAndCheck("function __BASIC__(__PARAM1__, __PARAM2__) {\n" +
                    "var __VAR__ = '__STR__';\n" +
                    "var __ANO__ = \"__STR2__\";\n" +
                    "}\n" +

                    "function __BASIC2__(__PARAM3__, __PARAM4__) {\n" +
                    "var __VAR2__ = '__STR2__';\n" +
                    "var __ANO2__ = \"__STR3__\";\n" +
                    "}\n");
  }

  public void testGoldenOutput0() throws Exception {
    // Empty source map test
    checkSourceMap("",

                   "{\n" +
                   "\"version\":3,\n" +
                   "\"file\":\"testcode\",\n" +
                   "\"lineCount\":1,\n" +
                   "\"mappings\":\";\",\n" +
                   "\"sources\":[],\n" +
                   "\"names\":[]\n" +
                   "}\n");
  }

  public void testGoldenOutput0a() throws Exception {
    // Empty source map test
    checkSourceMap("a;",

                   "{\n" +
                   "\"version\":3,\n" +
                   "\"file\":\"testcode\",\n" +
                   "\"lineCount\":1,\n" +
                   "\"mappings\":\"AAAAA;\",\n" +
                   "\"sources\":[\"testcode\"],\n" +
                   "\"names\":[\"a\"]\n" +
                   "}\n");
  }

  public void testGoldenOutput1() throws Exception {
    detailLevel = SourceMap.DetailLevel.ALL;

    checkSourceMap("function f(foo, bar) { foo = foo + bar + 2; return foo; }",

                   "{\n" +
                   "\"version\":3,\n" +
                   "\"file\":\"testcode\",\n" +
                   "\"lineCount\":1,\n" +
                   "\"mappings\":\"AAAAA,QAASA,EAAC,CAACC,GAAD,CAAMC,GAAN," +
                       "CAAW,CAAED,GAAA,CAAMA,GAAN,CAAYC,GAAZ,CAAkB,CAAG," +
                       "OAAOD,IAA9B;\",\n" +
                   "\"sources\":[\"testcode\"],\n" +
                   "\"names\":[\"f\",\"foo\",\"bar\"]\n" +
                   "}\n");

    detailLevel = SourceMap.DetailLevel.SYMBOLS;

    checkSourceMap("function f(foo, bar) { foo = foo + bar + 2; return foo; }",

                   "{\n" +
                   "\"version\":3,\n" +
                   "\"file\":\"testcode\",\n" +
                   "\"lineCount\":1,\n" +
                   "\"mappings\":\"AAAAA,QAASA,EAATA,CAAWC,GAAXD,CAAgBE," +
                       "GAAhBF,EAAuBC,GAAvBD,CAA6BC,GAA7BD,CAAmCE,GAAnCF," +
                       "SAAmDC,IAAnDD;\",\n" +
                   "\"sources\":[\"testcode\"],\n" +
                   "\"names\":[\"f\",\"foo\",\"bar\"]\n" +
                   "}\n");
  }

  public void testGoldenOutput2() throws Exception {
    checkSourceMap("function f(foo, bar) {\r\n\n\n\nfoo = foo + bar + foo;" +
                   "\nreturn foo;\n}",

                   "{\n" +
                   "\"version\":3,\n" +
                   "\"file\":\"testcode\",\n" +
                   "\"lineCount\":1,\n" +
                   "\"mappings\":\"AAAAA,QAASA,EAAC,CAACC,GAAD,CAAMC,GAAN," +
                       "CAAW,CAIrBD,GAAA,CAAMA,GAAN,CAAYC,GAAZ,CAAkBD," +
                       "GAClB,OAAOA,IALc;\",\n" +
                   "\"sources\":[\"testcode\"],\n" +
                   "\"names\":[\"f\",\"foo\",\"bar\"]\n" +
                   "}\n");
  }

  public void testGoldenOutput3() throws Exception {
    checkSourceMap("c:\\myfile.js",
                   "foo;",

                   "{\n" +
                   "\"version\":3,\n" +
                   "\"file\":\"testcode\",\n" +
                   "\"lineCount\":1,\n" +
                   "\"mappings\":\"AAAAA;\",\n" +
                   "\"sources\":[\"c:\\\\myfile.js\"],\n" +
                   "\"names\":[\"foo\"]\n" +
                   "}\n");
  }

  public void testGoldenOutput4() throws Exception {
    checkSourceMap("c:\\myfile.js",
                   "foo;   boo;   goo;",

                   "{\n" +
                   "\"version\":3,\n" +
                   "\"file\":\"testcode\",\n" +
                   "\"lineCount\":1,\n" +
                   "\"mappings\":\"AAAAA,GAAOC,IAAOC;\",\n" +
                   "\"sources\":[\"c:\\\\myfile.js\"],\n" +
                   "\"names\":[\"foo\",\"boo\",\"goo\"]\n" +
                   "}\n");
  }

  public void testGoldenOutput5() throws Exception {
    detailLevel = SourceMap.DetailLevel.ALL;

    checkSourceMap(
        "c:\\myfile.js",
        "/** @preserve\n" +
        " * this is a test.\n" +
        " */\n" +
        "var foo=a + 'this is a really long line that will force the"
        + " mapping to span multiple lines 123456789 123456789"
        + " 123456789 123456789 123456789 123456789 123456789"
        + " 123456789 123456789 123456789 123456789 123456789"
        + " 123456789 123456789 123456789 123456789 123456789"
        + " 123456789 123456789 123456789 123456789 123456789"
        + " 123456789 123456789 123456789 123456789 123456789"
        + " 123456789 123456789 123456789 123456789 123456789"
        + " 123456789 123456789 123456789 123456789 123456789"
        + " 123456789 123456789 123456789 123456789 123456789"
        + " 123456789 123456789 123456789 123456789 123456789"
        + " 123456789 123456789 123456789 123456789 123456789"
        + " 123456789 123456789 123456789 123456789 123456789"
        + " 123456789 123456789 123456789 123456789 123456789"
        + " 123456789 123456789 123456789 123456789 123456789"
        + " 123456789 123456789 123456789 123456789 123456789"
        + " 123456789 123456789 123456789 123456789 123456789"
        + " 123456789 123456789 123456789 123456789 123456789"
        + " 123456789 123456789 123456789 123456789 123456789"
        + " 123456789 123456789 123456789 123456789 123456789"
        + " 123456789 123456789 123456789 123456789 123456789"
        + " 123456789 123456789 123456789 123456789 123456789"
        + " 123456789 123456789 123456789 123456789 123456789"
        + " 123456789 123456789 123456789 123456789 123456789"
        + " 123456789 123456789 123456789 123456789 123456789"
        + " 123456789 123456789 123456789 123456789 123456789"
        + "' + c + d + e;",

        "{\n" +
        "\"version\":3,\n" +
        "\"file\":\"testcode\",\n" +
        "\"lineCount\":6,\n" +
        "\"mappings\":\"A;;;;AAGA,IAAIA,IAAIC,CAAJD,CAAQ,mxCAARA;AAA8xCE," +
            "CAA9xCF,CAAkyCG,CAAlyCH,CAAsyCI;\",\n" +
        "\"sources\":[\"c:\\\\myfile.js\"],\n" +
        "\"names\":[\"foo\",\"a\",\"c\",\"d\",\"e\"]\n" +
        "}\n");

    detailLevel = SourceMap.DetailLevel.SYMBOLS;

    checkSourceMap("c:\\myfile.js",
        "/** @preserve\n" +
        " * this is a test.\n" +
        " */\n" +
        "var foo=a + 'this is a really long line that will force the"
        + " mapping to span multiple lines 123456789 123456789"
        + " 123456789 123456789 123456789 123456789 123456789"
        + " 123456789 123456789 123456789 123456789 123456789"
        + " 123456789 123456789 123456789 123456789 123456789"
        + " 123456789 123456789 123456789 123456789 123456789"
        + " 123456789 123456789 123456789 123456789 123456789"
        + " 123456789 123456789 123456789 123456789 123456789"
        + " 123456789 123456789 123456789 123456789 123456789"
        + " 123456789 123456789 123456789 123456789 123456789"
        + " 123456789 123456789 123456789 123456789 123456789"
        + " 123456789 123456789 123456789 123456789 123456789"
        + " 123456789 123456789 123456789 123456789 123456789"
        + " 123456789 123456789 123456789 123456789 123456789"
        + " 123456789 123456789 123456789 123456789 123456789"
        + " 123456789 123456789 123456789 123456789 123456789"
        + " 123456789 123456789 123456789 123456789 123456789"
        + " 123456789 123456789 123456789 123456789 123456789"
        + " 123456789 123456789 123456789 123456789 123456789"
        + " 123456789 123456789 123456789 123456789 123456789"
        + " 123456789 123456789 123456789 123456789 123456789"
        + " 123456789 123456789 123456789 123456789 123456789"
        + " 123456789 123456789 123456789 123456789 123456789"
        + " 123456789 123456789 123456789 123456789 123456789"
        + " 123456789 123456789 123456789 123456789 123456789"
        + " 123456789 123456789 123456789 123456789 123456789"
        + "' + c + d + e;",

        "{\n" +
        "\"version\":3,\n" +
        "\"file\":\"testcode\",\n" +
        "\"lineCount\":6,\n" +
        "\"mappings\":\"A;;;;IAGIA,IAAIC,CAAJD;AAA8xCE,CAA9xCF,CAAkyCG," +
            "CAAlyCH,CAAsyCI;\",\n" +
        "\"sources\":[\"c:\\\\myfile.js\"],\n" +
        "\"names\":[\"foo\",\"a\",\"c\",\"d\",\"e\"]\n" +
        "}\n");
  }

  public void testBasicDeterminism() throws Exception {
    RunResult result1 = compile("file1", "foo;", "file2", "bar;");
    RunResult result2 = compile("file2", "foo;", "file1", "bar;");

    String map1 = getSourceMap(result1);
    String map2 = getSourceMap(result2);

    // Assert that the files section of the maps are the same. The actual
    // entries will differ, so we cannot do a simple full comparison.

    // Line 5 has the file information.
    String files1 = map1.split("\n")[4];
    String files2 = map2.split("\n")[4];

    assertEquals(files1, files2);
  }

  public void testWriteMetaMap() throws IOException {
    StringWriter out = new StringWriter();
    String name = "./app.js";
    List<SourceMapSection> appSections = Lists.newArrayList(
        SourceMapSection.forURL("src1", 0, 0),
        SourceMapSection.forURL("src2", 100, 10),
        SourceMapSection.forURL("src3", 150, 5));

    SourceMapGeneratorV3 generator = new SourceMapGeneratorV3();
    generator.appendIndexMapTo(out, name, appSections);

    assertEquals(
            "{\n" +
            "\"version\":3,\n" +
            "\"file\":\"./app.js\",\n" +
            "\"sections\":[\n" +
            "{\n" +
            "\"offset\":{\n" +
            "\"line\":0,\n" +
            "\"column\":0\n" +
            "},\n" +
            "\"url\":\"src1\"\n" +
            "},\n" +
            "{\n" +
            "\"offset\":{\n" +
            "\"line\":100,\n" +
            "\"column\":10\n" +
            "},\n" +
            "\"url\":\"src2\"\n" +
            "},\n" +
            "{\n" +
            "\"offset\":{\n" +
            "\"line\":150,\n" +
            "\"column\":5\n" +
            "},\n" +
            "\"url\":\"src3\"\n" +
            "}\n" +
            "]\n" +
            "}\n",
            out.toString());
  }

  private String getEmptyMapFor(String name) throws IOException {
    StringWriter out = new StringWriter();
    SourceMapGeneratorV3 generator = new SourceMapGeneratorV3();
    generator.appendTo(out, name);
    return out.toString();
  }

  public void testWriteMetaMap2() throws IOException {
    StringWriter out = new StringWriter();
    String name = "./app.js";
    List<SourceMapSection> appSections = Lists.newArrayList(
        // Map and URLs can be mixed.
        SourceMapSection.forMap(getEmptyMapFor("./part.js"), 0, 0),
        SourceMapSection.forURL("src2", 100, 10));

    SourceMapGeneratorV3 generator = new SourceMapGeneratorV3();
    generator.appendIndexMapTo(out, name, appSections);

    assertEquals(
            "{\n" +
            "\"version\":3,\n" +
            "\"file\":\"./app.js\",\n" +
            "\"sections\":[\n" +
            "{\n" +
            "\"offset\":{\n" +
            "\"line\":0,\n" +
            "\"column\":0\n" +
            "},\n" +
            "\"map\":{\n" +
              "\"version\":3,\n" +
              "\"file\":\"./part.js\",\n" +
              "\"lineCount\":1,\n" +
              "\"mappings\":\";\",\n" +
              "\"sources\":[],\n" +
              "\"names\":[]\n" +
            "}\n" +
            "\n" +
            "},\n" +
            "{\n" +
            "\"offset\":{\n" +
            "\"line\":100,\n" +
            "\"column\":10\n" +
            "},\n" +
            "\"url\":\"src2\"\n" +
            "}\n" +
            "]\n" +
            "}\n",
            out.toString());
  }

  public void testParseSourceMetaMap() throws Exception {
    final String INPUT1 = "file1";
    final String INPUT2 = "file2";
    LinkedHashMap<String, String> inputs = Maps.newLinkedHashMap();
    inputs.put(INPUT1, "var __FOO__ = 1;");
    inputs.put(INPUT2, "var __BAR__ = 2;");
    RunResult result1 = compile(inputs.get(INPUT1), INPUT1);
    RunResult result2 = compile(inputs.get(INPUT2), INPUT2);

    final String MAP1 = "map1";
    final String MAP2 = "map2";
    final LinkedHashMap<String, String> maps = Maps.newLinkedHashMap();
    maps.put(MAP1, result1.sourceMapFileContent);
    maps.put(MAP2, result2.sourceMapFileContent);

    List<SourceMapSection> sections = Lists.newArrayList();

    StringBuilder output = new StringBuilder();
    FilePosition offset = appendAndCount(output, result1.generatedSource);
    sections.add(SourceMapSection.forURL(MAP1, 0, 0));
    output.append(result2.generatedSource);
    sections.add(
        SourceMapSection.forURL(MAP2, offset.getLine(), offset.getColumn()));

    SourceMapGeneratorV3 generator = new SourceMapGeneratorV3();
    StringBuilder mapContents = new StringBuilder();
    generator.appendIndexMapTo(mapContents, "out.js", sections);

    check(inputs, output.toString(), mapContents.toString(),
      new SourceMapSupplier() {
        @Override
        public String getSourceMap(String url){
          return maps.get(url);
      }});
  }

  public void testSourceMapMerging() throws Exception {
    final String INPUT1 = "file1";
    final String INPUT2 = "file2";
    LinkedHashMap<String, String> inputs = Maps.newLinkedHashMap();
    inputs.put(INPUT1, "var __FOO__ = 1;");
    inputs.put(INPUT2, "var __BAR__ = 2;");
    RunResult result1 = compile(inputs.get(INPUT1), INPUT1);
    RunResult result2 = compile(inputs.get(INPUT2), INPUT2);

    StringBuilder output = new StringBuilder();
    FilePosition offset = appendAndCount(output, result1.generatedSource);
    output.append(result2.generatedSource);

    SourceMapGeneratorV3 generator = new SourceMapGeneratorV3();

    generator.mergeMapSection(0, 0, result1.sourceMapFileContent);
    generator.mergeMapSection(offset.getLine(), offset.getColumn(),
        result2.sourceMapFileContent);

    StringBuilder mapContents = new StringBuilder();
    generator.appendTo(mapContents, "out.js");

    check(inputs, output.toString(), mapContents.toString());
  }

  FilePosition count(String js) {
    int line = 0, column = 0;
    for (int i = 0; i < js.length(); i++) {
      if (js.charAt(i) == '\n') {
        line++;
        column = 0;
      } else {
        column++;
      }
    }
    return new FilePosition(line, column);
  }

  FilePosition appendAndCount(Appendable out, String js) throws IOException {
    out.append(js);
    return count(js);
  }
}