/*
 * 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.editor;

import com.google.common.base.Joiner;
import com.google.idea.blaze.base.lang.buildfile.BuildFileIntegrationTestCase;
import com.intellij.openapi.actionSystem.IdeActions;

/**
 * Tests that indents are inserted correctly when enter is pressed.
 */
public class BuildIndentOnEnterTest extends BuildFileIntegrationTestCase {

  private void setInput(String... fileContents) {
    testFixture.configureByText("BUILD", Joiner.on("\n").join(fileContents));
  }

  private void pressEnterAndAssertResult(String... resultingFileContents) {
    pressButton(IdeActions.ACTION_EDITOR_ENTER);
    String s = testFixture.getFile().getText();
    testFixture.checkResult(Joiner.on("\n").join(resultingFileContents));
  }

  public void testSimpleIndent() {
    setInput(
      "a=1<caret>");
    pressEnterAndAssertResult(
      "a=1",
      "<caret>");
  }

  public void testAlignInListMiddle() {
    setInput(
      "target = [a,<caret>",
      "          c]");
    pressEnterAndAssertResult(
      "target = [a,",
      "          <caret>",
      "          c]");
  }

  public void testNoAlignAfterList() {
    setInput(
      "target = [",
      "    arg",
      "]<caret>");
    pressEnterAndAssertResult(
      "target = [",
      "    arg",
      "]",
      "<caret>");
  }

  public void testAlignInDict() {
    setInput(
      "some_call({'aaa': 'v1',<caret>})");
    pressEnterAndAssertResult(
      "some_call({'aaa': 'v1',",
      "           <caret>})");
  }

  public void testAlignInDictInParams() {  // PY-1947
    setInput(
      "foobar({<caret>})");
    pressEnterAndAssertResult(
      "foobar({",
      "    <caret>",
      "})");
  }

  public void testAlignInEmptyList() {
    setInput(
      "target = [<caret>]");
    pressEnterAndAssertResult(
      "target = [",
      "    <caret>",
      "]");
  }

  public void testAlignInEmptyParens() {
    setInput(
      "foo(<caret>)");
    pressEnterAndAssertResult(
      "foo(",
      "    <caret>",
      ")");
  }

  public void testAlignInEmptyDict() {
    setInput(
      "{<caret>}");
    pressEnterAndAssertResult(
      "{",
      "    <caret>",
      "}");
  }

  public void testAlignInEmptyTuple() {
    setInput(
      "(<caret>)");
    pressEnterAndAssertResult(
      "(",
      "    <caret>",
      ")");
  }

  public void testEnterInNonEmptyArgList() {
    setInput(
      "func(<caret>params=1)");
    pressEnterAndAssertResult(
      "func(",
      "    <caret>params=1)");
  }

  public void testEmptyFuncallStart() {
    setInput(
      "func(<caret>",
      ")");
    pressEnterAndAssertResult(
      "func(",
      "    <caret>",
      ")");
  }

  public void testEmptyFuncallAfterNewlineNoIndent() {
    setInput(
      "func(",
      "<caret>)");
    pressEnterAndAssertResult(
      "func(",
      "",
      "<caret>)");
  }

  public void testEmptyFuncallAfterNewlineWithIndent() {
    setInput(
      "func(",
      "    <caret>",
      ")");
    pressEnterAndAssertResult(
      "func(",
      "    ",
      "    <caret>",
      ")");
  }

  public void testFuncallAfterFirstArg() {
    setInput(
      "func(",
      "    arg1,<caret>",
      ")");
    pressEnterAndAssertResult(
      "func(",
      "    arg1,",
      "    <caret>",
      ")");
  }

  public void testFuncallFirstArgOnSameLine() {
    setInput(
      "func(arg1, arg2,<caret>");
    pressEnterAndAssertResult(
      "func(arg1, arg2,",
      "     <caret>");
  }

  public void testFuncallFirstArgOnSameLineWithClosingBrace() {
    setInput(
      "func(arg1, arg2,<caret>)");
    pressEnterAndAssertResult(
      "func(arg1, arg2,",
      "     <caret>)");
  }

  public void testNonEmptyDict() {
    setInput(
      "{key1 : value1,<caret>}");
    pressEnterAndAssertResult(
      "{key1 : value1,",
      " <caret>}");
  }

  public void testNonEmptyDictFirstArgIndented() {
    setInput(
      "{",
      "    key1 : value1,<caret>" +
      "}");
    pressEnterAndAssertResult(
      "{",
      "    key1 : value1,",
      "    <caret>" +
      "}");
  }

  public void testEmptyDictAlreadyIndented() {
    setInput(
      "{",
      "    <caret>" +
      "}");
    pressEnterAndAssertResult(
      "{",
      "    ",
      "    <caret>" +
      "}");
  }

  public void testEmptyParamIndent() {
    setInput(
      "def fn(<caret>)");
    pressEnterAndAssertResult(
      "def fn(",
      "    <caret>",
      ")");
  }

  public void testNonEmptyParamIndent() {
    setInput(
      "def fn(param1,<caret>)");
    pressEnterAndAssertResult(
      "def fn(param1,",
      "       <caret>)");
  }

  public void testFunctionDefAfterColon() {
    setInput(
      "def fn():<caret>");
    pressEnterAndAssertResult(
      "def fn():",
      "  <caret>");
  }

  // def fn():stmt* (THIS IS CURRENTLY BROKEN -- shouldn't indent but does)
  public void testFunctionDefSingleStatement() {
    setInput(
      "def fn():stmt<caret>");
    pressEnterAndAssertResult(
      "def fn():stmt",
      "<caret>");
  }

  public void testFunctionDefAfterFirstSuiteStatement() {
    setInput(
      "def fn():",
      "  stmt1<caret>");
    pressEnterAndAssertResult(
      "def fn():",
      "  stmt1",
      "  <caret>");
  }

  public void testNoIndentAfterSuiteDedentOnEmptyLine() {
    setInput(
      "def fn():",
      "  stmt1",
      "  stmt2",
      "<caret>");
    pressEnterAndAssertResult(
      "def fn():",
      "  stmt1",
      "  stmt2",
      "",
      "<caret>");
  }

  public void testIndentAfterIf() {
    setInput(
      "if condition:<caret>"
    );
    pressEnterAndAssertResult(
      "if condition:",
      "  <caret>"
    );
  }

  public void testNoIndentAfterIfPlusStatement() {
    setInput(
      "if condition:stmt<caret>"
    );
    pressEnterAndAssertResult(
      "if condition:stmt",
      "<caret>"
    );
  }

  public void testIndentAfterElseIf() {
    setInput(
      "if condition:",
      "  stmt",
      "elif:<caret>"
    );
    pressEnterAndAssertResult(
      "if condition:",
      "  stmt",
      "elif:",
      "  <caret>"
    );
  }

  public void testNoIndentAfterElseIfPlusStatement() {
    setInput(
      "if condition:",
      "  stmt",
      "elif:stmt<caret>"
    );
    pressEnterAndAssertResult(
      "if condition:",
      "  stmt",
      "elif:stmt",
      "<caret>"
    );
  }

  public void testIndentAfterElse() {
    setInput(
      "if condition:",
      "  stmt",
      "else:<caret>"
    );
    pressEnterAndAssertResult(
      "if condition:",
      "  stmt",
      "else:",
      "  <caret>"
    );
  }

  public void testNoIndentAfterElsePlusStatement() {
    setInput(
      "if condition:",
      "  stmt",
      "else:stmt<caret>"
    );
    pressEnterAndAssertResult(
      "if condition:",
      "  stmt",
      "else:stmt",
      "<caret>"
    );
  }

  public void testIndentAfterForColon() {
    setInput(
      "for x in list:<caret>"
    );
    pressEnterAndAssertResult(
      "for x in list:",
      "  <caret>"
    );
  }

  public void testNoIndentAfterForPlusStatement() {
    setInput(
      "for x in list:do_action<caret>"
    );
    pressEnterAndAssertResult(
      "for x in list:do_action",
      "<caret>"
    );
  }

  public void testCommonRuleCase1() {
    setInput(
      "java_library(",
      "    name = 'lib'",
      "    srcs = [<caret>]");
    pressEnterAndAssertResult(
      "java_library(",
      "    name = 'lib'",
      "    srcs = [",
      "        <caret>",
      "    ]");
  }

  public void testCommonRuleCase2() {
    setInput(
      "java_library(",
      "    name = 'lib'",
      "    srcs = [",
      "        'source',<caret>",
      "    ]");
    pressEnterAndAssertResult(
      "java_library(",
      "    name = 'lib'",
      "    srcs = [",
      "        'source',",
      "        <caret>",
      "    ]");
  }

  public void testCommonRuleCase3() {
    setInput(
      "java_library(",
      "    name = 'lib'",
      "    srcs = ['first',<caret>]");
    pressEnterAndAssertResult(
      "java_library(",
      "    name = 'lib'",
      "    srcs = ['first',",
      "            <caret>]");
  }

  public void testDedentAfterReturn() {
    setInput(
      "def fn():",
      "  return None<caret>");
    pressEnterAndAssertResult(
      "def fn():",
      "  return None",
      "<caret>");
  }

  public void testDedentAfterEmptyReturn() {
    setInput(
      "def fn():",
      "  return<caret>");
    pressEnterAndAssertResult(
      "def fn():",
      "  return",
      "<caret>");
  }

  public void testDedentAfterReturnWithTrailingWhitespace() {
    setInput(
      "def fn():",
      "  return<caret>   ");
    pressEnterAndAssertResult(
      "def fn():",
      "  return",
      "<caret>");
  }

  public void testDedentAfterComplexReturn() {
    setInput(
      "def fn():",
      "  return a == b<caret>");
    pressEnterAndAssertResult(
      "def fn():",
      "  return a == b",
      "<caret>");
  }

  public void testDedentAfterPass() {
    setInput(
      "def fn():",
      "  pass<caret>");
    pressEnterAndAssertResult(
      "def fn():",
      "  pass",
      "<caret>");
  }

  public void testDedentAfterPassInLoop() {
    setInput(
      "def fn():",
      "  for a in (1,2,3):",
      "    pass<caret>");
    pressEnterAndAssertResult(
      "def fn():",
      "  for a in (1,2,3):",
      "    pass",
      "  <caret>");
  }

  // regression test for b/29564041
  public void testNoExceptionPressingEnterAtStartOfFile() {
    setInput("#<caret>");
    pressEnterAndAssertResult(
      "#",
      "<caret>");
  }

}