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package com.helger.css.decl;

import java.util.List;

import javax.annotation.Nonnegative;
import javax.annotation.Nonnull;
import javax.annotation.Nullable;

import com.helger.commons.ValueEnforcer;
import com.helger.commons.annotation.Nonempty;
import com.helger.commons.annotation.ReturnsMutableCopy;
import com.helger.commons.hashcode.HashCodeGenerator;
import com.helger.commons.state.EChange;
import com.helger.commons.string.StringHelper;
import com.helger.commons.string.ToStringGenerator;
import com.helger.css.CSSSourceLocation;
import com.helger.css.ECSSVersion;
import com.helger.css.ICSSVersionAware;
import com.helger.css.ICSSWriterSettings;

public class CSSPageMarginBlock implements
                                ICSSPageRuleMember,
                                ICSSVersionAware,
                                IHasCSSDeclarations 
{
  private String m_sPageMarginSymbol;
  private final CSSDeclarationContainer m_aDeclarations = new CSSDeclarationContainer ();
  private CSSSourceLocation m_aSourceLocation;

  public CSSPageMarginBlock (@Nonnull @Nonempty final String sPargeMarginSymbol)
  {
    setPageMarginSymbol (sPargeMarginSymbol);
  }

  @Nonnull
  @Nonempty
  public String getPageMarginSymbol ()
  {
    return m_sPageMarginSymbol;
  }

  @Nonnull
  public CSSPageMarginBlock setPageMarginSymbol (@Nonnull @Nonempty final String sPargeMarginSymbol)
  {
    ValueEnforcer.notEmpty (sPargeMarginSymbol, "PargeMarginSymbol");
    ValueEnforcer.isTrue (StringHelper.startsWith (sPargeMarginSymbol, '@'),
                          "Page margin symbol does not start with '@'!");
    m_sPageMarginSymbol = sPargeMarginSymbol;
    return this;
  }

  @Nonnull
  public CSSPageMarginBlock addDeclaration (final String sProperty,
                                            final CSSExpression aExpression,
                                            final boolean bImportant)
  {
    return addDeclaration (new CSSDeclaration (sProperty, aExpression, bImportant));
  }

  @Nonnull
  public CSSPageMarginBlock addDeclaration (@Nonnull final CSSDeclaration aDeclaration)
  {
    m_aDeclarations.addDeclaration (aDeclaration);
    return this;
  }

  @Nonnull
  public CSSPageMarginBlock addDeclaration (@Nonnegative final int nIndex,
                                            @Nonnull final CSSDeclaration aNewDeclaration)
  {
    m_aDeclarations.addDeclaration (nIndex, aNewDeclaration);
    return this;
  }

  @Nonnull
  public EChange removeDeclaration (@Nonnull final CSSDeclaration aDeclaration)
  {
    return m_aDeclarations.removeDeclaration (aDeclaration);
  }

  @Nonnull
  public EChange removeDeclaration (@Nonnegative final int nDeclarationIndex)
  {
    return m_aDeclarations.removeDeclaration (nDeclarationIndex);
  }

  @Nonnull
  public EChange removeAllDeclarations ()
  {
    return m_aDeclarations.removeAllDeclarations ();
  }

  @Nonnull
  @ReturnsMutableCopy
  public List  getAllDeclarations ()
  {
    return m_aDeclarations.getAllDeclarations ();
  }

  @Nullable
  public CSSDeclaration getDeclarationAtIndex (@Nonnegative final int nIndex)
  {
    return m_aDeclarations.getDeclarationAtIndex (nIndex);
  }

  @Nonnull
  public CSSPageMarginBlock setDeclarationAtIndex (@Nonnegative final int nIndex,
                                                   @Nonnull final CSSDeclaration aNewDeclaration)
  {
    m_aDeclarations.setDeclarationAtIndex (nIndex, aNewDeclaration);
    return this;
  }

  public boolean hasDeclarations ()
  {
    return m_aDeclarations.hasDeclarations ();
  }

  @Nonnegative
  public int getDeclarationCount ()
  {
    return m_aDeclarations.getDeclarationCount ();
  }

  @Nullable
  public CSSDeclaration getDeclarationOfPropertyName (@Nullable final String sPropertyName)
  {
    return m_aDeclarations.getDeclarationOfPropertyName (sPropertyName);
  }

  @Nullable
  public CSSDeclaration getDeclarationOfPropertyNameCaseInsensitive (@Nullable final String sPropertyName)
  {
    return m_aDeclarations.getDeclarationOfPropertyNameCaseInsensitive (sPropertyName);
  }

  @Nonnull
  @ReturnsMutableCopy
  public List  getAllDeclarationsOfPropertyName (@Nullable final String sPropertyName)
  {
    return m_aDeclarations.getAllDeclarationsOfPropertyName (sPropertyName);
  }

  @Nonnull
  @ReturnsMutableCopy
  public List  getAllDeclarationsOfPropertyNameCaseInsensitive (@Nullable final String sPropertyName)
  {
    return m_aDeclarations.getAllDeclarationsOfPropertyNameCaseInsensitive (sPropertyName);
  }

  @Nonnull
  @Nonempty
  public String getAsCSSString (@Nonnull final ICSSWriterSettings aSettings, @Nonnegative final int nIndentLevel)
  {
    aSettings.checkVersionRequirements (this);

    if (aSettings.isRemoveUnnecessaryCode () && !hasDeclarations ())
      return "";

    final boolean bOptimizedOutput = aSettings.isOptimizedOutput ();

    final StringBuilder aSB = new StringBuilder ();
    aSB.append (m_sPageMarginSymbol);
    aSB.append (m_aDeclarations.getAsCSSString (aSettings, nIndentLevel));
    return aSB.toString ();
  }

  @Nonnull
  public ECSSVersion getMinimumCSSVersion ()
  {
    return ECSSVersion.CSS30;
  }

  public void setSourceLocation (@Nullable final CSSSourceLocation aSourceLocation)
  {
    m_aSourceLocation = aSourceLocation;
  }

  @Nullable
  public CSSSourceLocation getSourceLocation ()
  {
    return m_aSourceLocation;
  }

  @Override
  public boolean equals (final Object o)
  {
    if (o == this)
      return true;
    if (o == null || !getClass ().equals (o.getClass ()))
      return false;
    final CSSPageMarginBlock rhs = (CSSPageMarginBlock) o;
    return m_sPageMarginSymbol.equals (rhs.m_sPageMarginSymbol) && m_aDeclarations.equals (rhs.m_aDeclarations);
  }

  @Override
  public int hashCode ()
  {
    return new HashCodeGenerator (this).append (m_sPageMarginSymbol).append (m_aDeclarations).getHashCode ();
  }

  @Override
  public String toString ()
  {
    return new ToStringGenerator (this).append ("pageMarginSymbol", m_sPageMarginSymbol)
                                       .append ("declarations", m_aDeclarations)
                                       .appendIfNotNull ("sourceLocation", m_aSourceLocation)
                                       .toString ();
  }
}