// Copyright (C) 2016 The Android Open Source Project
//
// 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.gerrit.server.mail.send;

import static com.google.common.truth.Truth.assertThat;
import static com.google.gerrit.server.mail.send.CommentFormatter.BlockType.LIST;
import static com.google.gerrit.server.mail.send.CommentFormatter.BlockType.PARAGRAPH;
import static com.google.gerrit.server.mail.send.CommentFormatter.BlockType.PRE_FORMATTED;
import static com.google.gerrit.server.mail.send.CommentFormatter.BlockType.QUOTE;

import java.util.List;
import org.junit.Test;

public class HumanCommentFormatterTest {
  private void assertBlock(
      List<CommentFormatter.Block> list, int index, CommentFormatter.BlockType type, String text) {
    CommentFormatter.Block block = list.get(index);
    assertThat(block.type).isEqualTo(type);
    assertThat(block.text).isEqualTo(text);
    assertThat(block.items).isNull();
    assertThat(block.quotedBlocks).isNull();
  }

  private void assertListBlock(
      List<CommentFormatter.Block> list, int index, int itemIndex, String text) {
    CommentFormatter.Block block = list.get(index);
    assertThat(block.type).isEqualTo(LIST);
    assertThat(block.items.get(itemIndex)).isEqualTo(text);
    assertThat(block.text).isNull();
    assertThat(block.quotedBlocks).isNull();
  }

  private void assertQuoteBlock(List<CommentFormatter.Block> list, int index, int size) {
    CommentFormatter.Block block = list.get(index);
    assertThat(block.type).isEqualTo(QUOTE);
    assertThat(block.items).isNull();
    assertThat(block.text).isNull();
    assertThat(block.quotedBlocks).hasSize(size);
  }

  @Test
  public void parseNullAsEmpty() {
    assertThat(CommentFormatter.parse(null)).isEmpty();
  }

  @Test
  public void parseEmpty() {
    assertThat(CommentFormatter.parse("")).isEmpty();
  }

  @Test
  public void parseSimple() {
    String comment = "Para1";
    List<CommentFormatter.Block> result = CommentFormatter.parse(comment);

    assertThat(result).hasSize(1);
    assertBlock(result, 0, PARAGRAPH, comment);
  }

  @Test
  public void parseMultilinePara() {
    String comment = "Para 1\nStill para 1";
    List<CommentFormatter.Block> result = CommentFormatter.parse(comment);

    assertThat(result).hasSize(1);
    assertBlock(result, 0, PARAGRAPH, comment);
  }

  @Test
  public void parseParaBreak() {
    String comment = "Para 1\n\nPara 2\n\nPara 3";
    List<CommentFormatter.Block> result = CommentFormatter.parse(comment);

    assertThat(result).hasSize(3);
    assertBlock(result, 0, PARAGRAPH, "Para 1");
    assertBlock(result, 1, PARAGRAPH, "Para 2");
    assertBlock(result, 2, PARAGRAPH, "Para 3");
  }

  @Test
  public void parseQuote() {
    String comment = "> Quote text";
    List<CommentFormatter.Block> result = CommentFormatter.parse(comment);

    assertThat(result).hasSize(1);
    assertQuoteBlock(result, 0, 1);
    assertBlock(result.get(0).quotedBlocks, 0, PARAGRAPH, "Quote text");
  }

  @Test
  public void parseExcludesEmpty() {
    String comment = "Para 1\n\n\n\nPara 2";
    List<CommentFormatter.Block> result = CommentFormatter.parse(comment);

    assertThat(result).hasSize(2);
    assertBlock(result, 0, PARAGRAPH, "Para 1");
    assertBlock(result, 1, PARAGRAPH, "Para 2");
  }

  @Test
  public void parseQuoteLeadSpace() {
    String comment = " > Quote text";
    List<CommentFormatter.Block> result = CommentFormatter.parse(comment);

    assertThat(result).hasSize(1);
    assertQuoteBlock(result, 0, 1);
    assertBlock(result.get(0).quotedBlocks, 0, PARAGRAPH, "Quote text");
  }

  @Test
  public void parseMultiLineQuote() {
    String comment = "> Quote line 1\n> Quote line 2\n > Quote line 3\n";
    List<CommentFormatter.Block> result = CommentFormatter.parse(comment);

    assertThat(result).hasSize(1);
    assertQuoteBlock(result, 0, 1);
    assertBlock(
        result.get(0).quotedBlocks, 0, PARAGRAPH, "Quote line 1\nQuote line 2\nQuote line 3\n");
  }

  @Test
  public void parsePre() {
    String comment = "    Four space indent.";
    List<CommentFormatter.Block> result = CommentFormatter.parse(comment);

    assertThat(result).hasSize(1);
    assertBlock(result, 0, PRE_FORMATTED, comment);
  }

  @Test
  public void parseOneSpacePre() {
    String comment = " One space indent.\n Another line.";
    List<CommentFormatter.Block> result = CommentFormatter.parse(comment);

    assertThat(result).hasSize(1);
    assertBlock(result, 0, PRE_FORMATTED, comment);
  }

  @Test
  public void parseTabPre() {
    String comment = "\tOne tab indent.\n\tAnother line.\n  Yet another!";
    List<CommentFormatter.Block> result = CommentFormatter.parse(comment);

    assertThat(result).hasSize(1);
    assertBlock(result, 0, PRE_FORMATTED, comment);
  }

  @Test
  public void parseIntermediateLeadingWhitespacePre() {
    String comment = "No indent.\n\tNonzero indent.\nNo indent again.";
    List<CommentFormatter.Block> result = CommentFormatter.parse(comment);

    assertThat(result).hasSize(1);
    assertBlock(result, 0, PRE_FORMATTED, comment);
  }

  @Test
  public void parseStarList() {
    String comment = "* Item 1\n* Item 2\n* Item 3";
    List<CommentFormatter.Block> result = CommentFormatter.parse(comment);

    assertThat(result).hasSize(1);
    assertListBlock(result, 0, 0, "Item 1");
    assertListBlock(result, 0, 1, "Item 2");
    assertListBlock(result, 0, 2, "Item 3");
  }

  @Test
  public void parseDashList() {
    String comment = "- Item 1\n- Item 2\n- Item 3";
    List<CommentFormatter.Block> result = CommentFormatter.parse(comment);

    assertThat(result).hasSize(1);
    assertListBlock(result, 0, 0, "Item 1");
    assertListBlock(result, 0, 1, "Item 2");
    assertListBlock(result, 0, 2, "Item 3");
  }

  @Test
  public void parseMixedList() {
    String comment = "- Item 1\n* Item 2\n- Item 3\n* Item 4";
    List<CommentFormatter.Block> result = CommentFormatter.parse(comment);

    assertThat(result).hasSize(1);
    assertListBlock(result, 0, 0, "Item 1");
    assertListBlock(result, 0, 1, "Item 2");
    assertListBlock(result, 0, 2, "Item 3");
    assertListBlock(result, 0, 3, "Item 4");
  }

  @Test
  public void parseMixedBlockTypes() {
    String comment =
        "Paragraph\nacross\na\nfew\nlines."
            + "\n\n"
            + "> Quote\n> across\n> not many lines."
            + "\n\n"
            + "Another paragraph"
            + "\n\n"
            + "* Series\n* of\n* list\n* items"
            + "\n\n"
            + "Yet another paragraph"
            + "\n\n"
            + "\tPreformatted text."
            + "\n\n"
            + "Parting words.";
    List<CommentFormatter.Block> result = CommentFormatter.parse(comment);

    assertThat(result).hasSize(7);
    assertBlock(result, 0, PARAGRAPH, "Paragraph\nacross\na\nfew\nlines.");
    assertQuoteBlock(result, 1, 1);
    assertBlock(result.get(1).quotedBlocks, 0, PARAGRAPH, "Quote\nacross\nnot many lines.");
    assertBlock(result, 2, PARAGRAPH, "Another paragraph");
    assertListBlock(result, 3, 0, "Series");
    assertListBlock(result, 3, 1, "of");
    assertListBlock(result, 3, 2, "list");
    assertListBlock(result, 3, 3, "items");
    assertBlock(result, 4, PARAGRAPH, "Yet another paragraph");
    assertBlock(result, 5, PRE_FORMATTED, "\tPreformatted text.");
    assertBlock(result, 6, PARAGRAPH, "Parting words.");
  }

  @Test
  public void bulletList1() {
    String comment = "A\n\n* line 1\n* 2nd line";
    List<CommentFormatter.Block> result = CommentFormatter.parse(comment);

    assertThat(result).hasSize(2);
    assertBlock(result, 0, PARAGRAPH, "A");
    assertListBlock(result, 1, 0, "line 1");
    assertListBlock(result, 1, 1, "2nd line");
  }

  @Test
  public void bulletList2() {
    String comment = "A\n\n* line 1\n* 2nd line\n\nB";
    List<CommentFormatter.Block> result = CommentFormatter.parse(comment);

    assertThat(result).hasSize(3);
    assertBlock(result, 0, PARAGRAPH, "A");
    assertListBlock(result, 1, 0, "line 1");
    assertListBlock(result, 1, 1, "2nd line");
    assertBlock(result, 2, PARAGRAPH, "B");
  }

  @Test
  public void bulletList3() {
    String comment = "* line 1\n* 2nd line\n\nB";
    List<CommentFormatter.Block> result = CommentFormatter.parse(comment);

    assertThat(result).hasSize(2);
    assertListBlock(result, 0, 0, "line 1");
    assertListBlock(result, 0, 1, "2nd line");
    assertBlock(result, 1, PARAGRAPH, "B");
  }

  @Test
  public void bulletList4() {
    String comment =
        "To see this bug, you have to:\n" //
            + "* Be on IMAP or EAS (not on POP)\n" //
            + "* Be very unlucky\n";
    List<CommentFormatter.Block> result = CommentFormatter.parse(comment);

    assertThat(result).hasSize(2);
    assertBlock(result, 0, PARAGRAPH, "To see this bug, you have to:");
    assertListBlock(result, 1, 0, "Be on IMAP or EAS (not on POP)");
    assertListBlock(result, 1, 1, "Be very unlucky");
  }

  @Test
  public void bulletList5() {
    String comment =
        "To see this bug,\n" //
            + "you have to:\n" //
            + "* Be on IMAP or EAS (not on POP)\n" //
            + "* Be very unlucky\n";
    List<CommentFormatter.Block> result = CommentFormatter.parse(comment);

    assertThat(result).hasSize(2);
    assertBlock(result, 0, PARAGRAPH, "To see this bug, you have to:");
    assertListBlock(result, 1, 0, "Be on IMAP or EAS (not on POP)");
    assertListBlock(result, 1, 1, "Be very unlucky");
  }

  @Test
  public void dashList1() {
    String comment = "A\n\n- line 1\n- 2nd line";
    List<CommentFormatter.Block> result = CommentFormatter.parse(comment);

    assertThat(result).hasSize(2);
    assertBlock(result, 0, PARAGRAPH, "A");
    assertListBlock(result, 1, 0, "line 1");
    assertListBlock(result, 1, 1, "2nd line");
  }

  @Test
  public void dashList2() {
    String comment = "A\n\n- line 1\n- 2nd line\n\nB";
    List<CommentFormatter.Block> result = CommentFormatter.parse(comment);

    assertThat(result).hasSize(3);
    assertBlock(result, 0, PARAGRAPH, "A");
    assertListBlock(result, 1, 0, "line 1");
    assertListBlock(result, 1, 1, "2nd line");
    assertBlock(result, 2, PARAGRAPH, "B");
  }

  @Test
  public void dashList3() {
    String comment = "- line 1\n- 2nd line\n\nB";
    List<CommentFormatter.Block> result = CommentFormatter.parse(comment);

    assertThat(result).hasSize(2);
    assertListBlock(result, 0, 0, "line 1");
    assertListBlock(result, 0, 1, "2nd line");
    assertBlock(result, 1, PARAGRAPH, "B");
  }

  @Test
  public void preformat1() {
    String comment = "A\n\n  This is pre\n  formatted";
    List<CommentFormatter.Block> result = CommentFormatter.parse(comment);

    assertThat(result).hasSize(2);
    assertBlock(result, 0, PARAGRAPH, "A");
    assertBlock(result, 1, PRE_FORMATTED, "  This is pre\n  formatted");
  }

  @Test
  public void preformat2() {
    String comment = "A\n\n  This is pre\n  formatted\n\nbut this is not";
    List<CommentFormatter.Block> result = CommentFormatter.parse(comment);

    assertThat(result).hasSize(3);
    assertBlock(result, 0, PARAGRAPH, "A");
    assertBlock(result, 1, PRE_FORMATTED, "  This is pre\n  formatted");
    assertBlock(result, 2, PARAGRAPH, "but this is not");
  }

  @Test
  public void preformat3() {
    String comment = "A\n\n  Q\n    <R>\n  S\n\nB";
    List<CommentFormatter.Block> result = CommentFormatter.parse(comment);

    assertThat(result).hasSize(3);
    assertBlock(result, 0, PARAGRAPH, "A");
    assertBlock(result, 1, PRE_FORMATTED, "  Q\n    <R>\n  S");
    assertBlock(result, 2, PARAGRAPH, "B");
  }

  @Test
  public void preformat4() {
    String comment = "  Q\n    <R>\n  S\n\nB";
    List<CommentFormatter.Block> result = CommentFormatter.parse(comment);

    assertThat(result).hasSize(2);
    assertBlock(result, 0, PRE_FORMATTED, "  Q\n    <R>\n  S");
    assertBlock(result, 1, PARAGRAPH, "B");
  }

  @Test
  public void quote1() {
    String comment = "> I'm happy\n > with quotes!\n\nSee above.";
    List<CommentFormatter.Block> result = CommentFormatter.parse(comment);

    assertThat(result).hasSize(2);
    assertQuoteBlock(result, 0, 1);
    assertBlock(result.get(0).quotedBlocks, 0, PARAGRAPH, "I'm happy\nwith quotes!");
    assertBlock(result, 1, PARAGRAPH, "See above.");
  }

  @Test
  public void quote2() {
    String comment = "See this said:\n\n > a quoted\n > string block\n\nOK?";
    List<CommentFormatter.Block> result = CommentFormatter.parse(comment);

    assertThat(result).hasSize(3);
    assertBlock(result, 0, PARAGRAPH, "See this said:");
    assertQuoteBlock(result, 1, 1);
    assertBlock(result.get(1).quotedBlocks, 0, PARAGRAPH, "a quoted\nstring block");
    assertBlock(result, 2, PARAGRAPH, "OK?");
  }

  @Test
  public void nestedQuotes1() {
    String comment = " > > prior\n > \n > next\n";
    List<CommentFormatter.Block> result = CommentFormatter.parse(comment);

    assertThat(result).hasSize(1);
    assertQuoteBlock(result, 0, 2);
    assertQuoteBlock(result.get(0).quotedBlocks, 0, 1);
    assertBlock(result.get(0).quotedBlocks.get(0).quotedBlocks, 0, PARAGRAPH, "prior");
    assertBlock(result.get(0).quotedBlocks, 1, PARAGRAPH, "next\n");
  }

  @Test
  public void largeMixedQuote() {
    String comment =
        "> > Paragraph 1.\n"
            + "> > \n"
            + "> > > Paragraph 2.\n"
            + "> > \n"
            + "> > Paragraph 3.\n"
            + "> > \n"
            + "> >    pre line 1;\n"
            + "> >    pre line 2;\n"
            + "> > \n"
            + "> > Paragraph 4.\n"
            + "> > \n"
            + "> > * List item 1.\n"
            + "> > * List item 2.\n"
            + "> > \n"
            + "> > Paragraph 5.\n"
            + "> \n"
            + "> Paragraph 6.\n"
            + "\n"
            + "Paragraph 7.\n";
    List<CommentFormatter.Block> result = CommentFormatter.parse(comment);

    assertThat(result).hasSize(2);
    assertQuoteBlock(result, 0, 2);

    assertQuoteBlock(result.get(0).quotedBlocks, 0, 7);
    List<CommentFormatter.Block> bigQuote = result.get(0).quotedBlocks.get(0).quotedBlocks;
    assertBlock(bigQuote, 0, PARAGRAPH, "Paragraph 1.");
    assertQuoteBlock(bigQuote, 1, 1);
    assertBlock(bigQuote.get(1).quotedBlocks, 0, PARAGRAPH, "Paragraph 2.");
    assertBlock(bigQuote, 2, PARAGRAPH, "Paragraph 3.");
    assertBlock(bigQuote, 3, PRE_FORMATTED, "   pre line 1;\n   pre line 2;");
    assertBlock(bigQuote, 4, PARAGRAPH, "Paragraph 4.");
    assertListBlock(bigQuote, 5, 0, "List item 1.");
    assertListBlock(bigQuote, 5, 1, "List item 2.");
    assertBlock(bigQuote, 6, PARAGRAPH, "Paragraph 5.");
    assertBlock(result.get(0).quotedBlocks, 1, PARAGRAPH, "Paragraph 6.");
    assertBlock(result, 1, PARAGRAPH, "Paragraph 7.\n");
  }
}