/*
 * Copyright 2016 The Bazel Authors. All rights reserved.
 *
 * 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.idea.blaze.base.lang.buildfile.findusages;

import com.google.idea.blaze.base.lang.buildfile.BuildFileIntegrationTestCase;
import com.google.idea.blaze.base.lang.buildfile.psi.Argument;
import com.google.idea.blaze.base.lang.buildfile.psi.BuildFile;
import com.google.idea.blaze.base.lang.buildfile.psi.FuncallExpression;
import com.google.idea.blaze.base.lang.buildfile.psi.StringLiteral;
import com.google.idea.blaze.base.lang.buildfile.psi.util.PsiUtils;
import com.google.idea.blaze.base.lang.buildfile.search.FindUsages;
import com.intellij.psi.PsiElement;
import com.intellij.psi.PsiFile;
import com.intellij.psi.PsiReference;

import static com.google.common.truth.Truth.assertThat;

/**
 * Tests that references to external files (e.g. Java classes, text files) are found by the 'Find Usages' action
 */
public class ExternalFileUsagesTest extends BuildFileIntegrationTestCase {

  public void testJavaClassUsagesFound() {
    PsiFile javaFile = createPsiFile(
      "com/google/foo/JavaClass.java",
      "package com.google.foo;",
      "public class JavaClass {}");

    BuildFile buildFile = createBuildFile(
      "com/google/foo/BUILD",
      "java_library(name = \"lib\", srcs = [\"JavaClass.java\"])");

    PsiReference[] references = FindUsages.findAllReferences(javaFile);
    assertThat(references).hasLength(1);

    Argument.Keyword arg = buildFile.findChildByClass(FuncallExpression.class)
      .getKeywordArgument("srcs");

    PsiElement ref = references[0].getElement();
    assertThat(ref).isInstanceOf(StringLiteral.class);
    assertThat(PsiUtils.getParentOfType(ref, Argument.Keyword.class))
      .isEqualTo(arg);
  }

  public void testTextFileUsagesFound() {
    PsiFile textFile = createPsiFile("com/google/foo/data.txt");

    BuildFile buildFile = createBuildFile(
      "com/google/foo/BUILD",
      "filegroup(name = \"lib\", srcs = [\"data.txt\"])",
      "filegroup(name = \"lib2\", srcs = [\"//com/google/foo:data.txt\"])");

    PsiReference[] references = FindUsages.findAllReferences(textFile);
    assertThat(references).hasLength(2);
  }

  public void testInvalidReferenceDoesntResolve() {
    BuildFile packageFoo = createBuildFile("com/google/foo/BUILD");
    PsiFile textFileInFoo = createPsiFile("com/google/foo/data.txt");

    BuildFile packageBar = createBuildFile(
      "com/google/bar/BUILD",
      "filegroup(name = \"lib\", srcs = [\":data.txt\"])");

    PsiReference[] references = FindUsages.findAllReferences(textFileInFoo);
    assertThat(references).isEmpty();
  }

  public void testSkylarkExtensionUsagesFound() {
    BuildFile ext = createBuildFile(
      "com/google/foo/ext.bzl",
      "def fn(): return");
    createBuildFile(
      "com/google/foo/BUILD",
      "load(':ext.bzl', 'fn')",
      "load('ext.bzl', 'fn')",
      "load('//com/google/foo:ext.bzl', 'fn')"
    );

    PsiReference[] references = FindUsages.findAllReferences(ext);
    assertThat(references).hasLength(3);
  }

  public void testSkylarkExtensionInSubDirectoryUsagesFound() {
    BuildFile ext = createBuildFile(
      "com/google/foo/subdir/ext.bzl",
      "def fn(): return");
    createBuildFile(
      "com/google/foo/BUILD",
      "load(':subdir/ext.bzl', 'fn')",
      "load('subdir/ext.bzl', 'fn')",
      "load('//com/google/foo:subdir/ext.bzl', 'fn')"
    );

    PsiReference[] references = FindUsages.findAllReferences(ext);
    assertThat(references).hasLength(3);
  }

  public void testSkylarkExtensionInSubDirectoryOfDifferentPackage() {
    BuildFile otherPkg = createBuildFile(
      "com/google/foo/BUILD");
    BuildFile ext = createBuildFile(
      "com/google/foo/subdir/ext.bzl",
      "def fn(): return");

    createBuildFile(
      "com/google/bar/BUILD",
      "load('//com/google/foo:subdir/ext.bzl', 'fn')"
    );

    PsiReference[] references = FindUsages.findAllReferences(ext);
    assertThat(references).hasLength(1);
  }

  public void testSkylarkExtensionReferencedFromSubpackage() {
    BuildFile pkg = createBuildFile(
      "com/google/foo/BUILD");
    BuildFile ext1 = createBuildFile(
      "com/google/foo/subdir/testing.bzl",
      "def fn(): return");
    BuildFile ext2 = createBuildFile(
      "com/google/foo/subdir/other.bzl",
      "load(':subdir/testing.bzl', 'fn')");

    PsiReference[] references = FindUsages.findAllReferences(ext1);
    assertThat(references).hasLength(1);
  }

}