/*
    * Copyright (c) 2011-2024 PrimeFaces Extensions
    *
    *  Permission is hereby granted, free of charge, to any person obtaining a copy
    *  of this software and associated documentation files (the "Software"), to deal
    *  in the Software without restriction, including without limitation the rights
    *  to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
    *  copies of the Software, and to permit persons to whom the Software is
    *  furnished to do so, subject to the following conditions:
   *
   *  The above copyright notice and this permission notice shall be included in
   *  all copies or substantial portions of the Software.
   *
   *  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
   *  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
   *  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
   *  AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
   *  LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
   *  OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
   *  THE SOFTWARE.
   */
  package org.primefaces.extensions.application;
  
  import java.io.ByteArrayInputStream;
  import java.io.ByteArrayOutputStream;
  import java.io.IOException;
  import java.io.InputStream;
  import java.nio.charset.StandardCharsets;
  import java.util.Arrays;
  import java.util.HashMap;
  import java.util.List;
  import java.util.Map;
  
  import javax.faces.application.Resource;
  import javax.faces.application.ResourceWrapper;
  import javax.faces.context.FacesContext;
  
  import org.primefaces.util.Constants;
  import org.primefaces.util.LangUtils;
  
  /**
   * @author Jasper de Vries <jepsar@gmail.com>
   * @since 10.0.1
   */
  public class ThemeAccentColorResource extends ResourceWrapper {
  
      private static final Map<String, String> CACHE = new HashMap<>();
      private static final Map<String, List<String>> ACCENT_COLORS = new HashMap<>();
  
      static {
          // @formatter:off
          // colors ? 0: main, 1: hover, 2: active, 3: focus outline, 4: text
          ACCENT_COLORS.put("primefaces-arya", Arrays.asList("#90caf9", "#6bb8f7", "#45a6f5", "#b1dafb", "rgba(255,255,255,.87)"));
          ACCENT_COLORS.put("primefaces-saga", Arrays.asList("#2196f3", "#0d89ec", "#0b7ad1", "#a6d5fa", "#495057"));
          ACCENT_COLORS.put("primefaces-vela", Arrays.asList("#90caf9", "#6bb8f7", "#45a6f5", "#b1dafb", "rgba(255,255,255,.87)"));
          // @formatter:on
      }
  
      private final String charEncoding;
  
      public ThemeAccentColorResource(final Resource wrapped) {
          super(wrapped);
          String encoding = FacesContext.getCurrentInstance().getExternalContext().getRequestCharacterEncoding();
          if (LangUtils.isBlank(encoding)) {
              encoding = StandardCharsets.UTF_8.name();
          }
          this.charEncoding = encoding;
      }
  
      @Override
      public InputStream getInputStream() throws IOException {
          final String library = getWrapped().getLibraryName();
          final List<String> accentColors = ACCENT_COLORS.get(library);
          if (accentColors == null || accentColors.isEmpty()) {
              return getWrapped().getInputStream();
          }
  
          if (CACHE.containsKey(library)) {
              return new ByteArrayInputStream(CACHE.get(library).getBytes(charEncoding));
          }
  
          final String accentColor = "var(--"
                      + library.replace(ThemeAccentColorResourceHandler.LIBRARY_PREFIX, Constants.EMPTY_STRING)
                      + "%d)";
          String css = getContent();
          for (int i = 0; i < accentColors.size(); i++) {
              css = css.replace(accentColors.get(i), String.format(accentColor, i));
          }
          CACHE.put(library, css);
  
          return new ByteArrayInputStream(css.getBytes(charEncoding));
      }
  
      protected String getContent() throws IOException {
          final ByteArrayOutputStream result = new ByteArrayOutputStream();
          final byte[] buffer = new byte[1024];
          final InputStream inputStream = getWrapped().getInputStream();
          for (int length; (length = inputStream.read(buffer)) != -1;) {
              result.write(buffer, 0, length);
         }
         return result.toString(charEncoding);
     }
 }