/*
   SPDX-FileCopyrightText: 2020-2022 Laurent Montel <montel@kde.org>

   SPDX-License-Identifier: LGPL-2.0-or-later
*/

#pragma once
#include "abstractmarkupbuilder.h"
#include "kpimtextedit_export.h"

namespace KPIMTextEdit
{
class TextHTMLBuilderPrivate;

/// @headerfile texthtmlbuilder.h grantlee/texthtmlbuilder.h

/**
  @brief The TextHTMLBuilder creates a clean html markup output.

  This class creates html output which is as minimal as possible and restricted
  to the rich text features supported in %Qt.
  (https://doc.qt.io/qt-5/richtext-html-subset.html)

  The output contains only the body content, not the head element or other
  metadata.

  eg:

  @code
    <p>
      This is some <strong>formatted content</strong> in a paragraph.
    </p>
  @endcode

  instead of the content produced by %Qt:

  @code
    <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0//EN"
  "http://www.w3.org/TR/REC-html40/strict.dtd">
    <html><head><meta name="qrichtext" content="1" /><meta
  http-equiv="Content-Type" content="text/html; charset=UTF-8" /><style
  type="text/css">
    p, li { white-space: pre-wrap; }
    </style></head><body style=" font-family:'Sans Serif'; font-size:10pt;
  font-weight:400; font-style:normal;">
    <p style=" margin-top:12px; margin-bottom:12px; margin-left:0px;
  margin-right:0px; -qt-block-indent:0; text-indent:0px;">This is some <span
  style=" font-weight:600;">formatted content</span> in a paragraph.
  </p></body></html>
  @endcode

  Such tags should be created separately. For example:

  @code
    auto b = new TextHTMLBuilder();
    auto md = new MarkupDirector(b);
    md->constructContent();
    QString cleanHtml(
      "<head>\n<title>%1</title>\n</head>\n<body>%2</body>\n</html>")
                      .arg(document.metaInformation(QTextDocument::DocumentTitle))
                      .arg(b->getOutput());
    file.write(cleanHtml);
  @endcode

  Font formatting information on elements is represented by individual span
  elements.

  eg:
  @code
    <span style"color:blue;">
      <span style="background-color:red;">
        Blue text on red background
      </span>
    </span>
  @endcode

  instead of

  @code
    <span style="color:blue;background-color:red;">
      Blue text on red background
    </span>
  @endcode

  It my be possible to change this if necessary.

  @author Stephen Kelly <steveire@gmail.com>
*/
class KPIMTEXTEDIT_EXPORT TextHTMLBuilder : virtual public KPIMTextEdit::AbstractMarkupBuilder
{
public:
    TextHTMLBuilder();
    ~TextHTMLBuilder() override;

    void beginStrong() override;
    void endStrong() override;
    void beginEmph() override;
    void endEmph() override;
    void beginUnderline() override;
    void endUnderline() override;
    void beginStrikeout() override;
    void endStrikeout() override;
    void beginForeground(const QBrush &brush) override;
    void endForeground() override;
    void beginBackground(const QBrush &brush) override;
    void endBackground() override;
    void beginAnchor(const QString &href = {}, const QString &name = {}) override;
    void endAnchor() override;

    // Maybe this stuff should just be added to a list, and then when I add
    // literal text,
    // add some kind of style attribute in one span instead of many.
    void beginFontFamily(const QString &family) override;
    void endFontFamily() override;

    /**
    Begin a new font point size
    @param size The new size to begin.
  */
    void beginFontPointSize(int size) override;
    void endFontPointSize() override;

    /**
    Begin a new paragraph
    @param al The new paragraph alignment
    @param topMargin The new paragraph topMargin
    @param bottomMargin The new paragraph bottomMargin
    @param leftMargin The new paragraph leftMargin
    @param rightMargin The new paragraph rightMargin
  */
    void beginParagraph(Qt::Alignment al = Qt::AlignLeft,
                        qreal topMargin = 0.0,
                        qreal bottomMargin = 0.0,
                        qreal leftMargin = 0.0,
                        qreal rightMargin = 0.0,
                        bool leftToRightText = false) override;

    /**
    Begin a new header element.
    @param level The new level to begin.
  */
    void beginHeader(int level) override;

    /**
    End a header element.
    @param level The new level to end.
  */
    void endHeader(int level) override;

    void endParagraph() override;
    void addNewline() override;

    void insertHorizontalRule(int width = -1) override;

    void insertImage(const QString &src, qreal width, qreal height) override;

    void beginList(QTextListFormat::Style type) override;

    void endList() override;

    void beginListItem() override;
    void endListItem() override;

    void beginSuperscript() override;

    void endSuperscript() override;

    void beginSubscript() override;

    void endSubscript() override;

    void beginTable(qreal cellpadding, qreal cellspacing, const QString &width) override;

    void beginTableRow() override;
    void beginTableHeaderCell(const QString &width, int colspan, int rowspan) override;

    void beginTableCell(const QString &width, int colspan, int rowspan) override;

    void endTable() override;
    void endTableRow() override;
    void endTableHeaderCell() override;
    void endTableCell() override;

    /**
    Reimplemented from AbstractMarkupBuilder.

    This implementation escapes the text before appending so that

    @verbatim
      A sample <b>bold</b> word.
    @endverbatim

    becomes

    @verbatim
      A sample &lt;b&gt;bold&lt;/b&gt; word.
    @endverbatim
  */
    void appendLiteralText(const QString &text) override;

    /**
    Append @p text without escaping.

    This is useful if extending MarkupDirector
  */
    void appendRawText(const QString &text) override;

    Q_REQUIRED_RESULT QString getResult() override;

    void addSingleBreakLine() override;

private:
    TextHTMLBuilderPrivate *d_ptr;
    Q_DECLARE_PRIVATE(TextHTMLBuilder)
};

}
