﻿/*
 * Copyright 2012 ZXing.Net authors
 *
 * 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.
 */

using System;
using UnityEngine;

namespace ZXing
{
   /// <summary>
   /// A smart class to decode the barcode inside a bitmap object
   /// </summary>
   [System.CLSCompliant(false)]
   public class BarcodeReader : BarcodeReaderGeneric, IBarcodeReader
   {
      private static readonly Func<Color32[], int, int, LuminanceSource> defaultCreateLuminanceSource =
         (rawColor32, width, height) => new Color32LuminanceSource(rawColor32, width, height);

      private readonly Func<Color32[], int, int, LuminanceSource> createLuminanceSource;

      /// <summary>
      /// Initializes a new instance of the <see cref="BarcodeReader"/> class.
      /// </summary>
      public BarcodeReader()
         : this(new MultiFormatReader(), defaultCreateLuminanceSource, null)
      {
      }

      /// <summary>
      /// Initializes a new instance of the <see cref="BarcodeReader"/> class.
      /// </summary>
      /// <param name="reader">Sets the reader which should be used to find and decode the barcode.
      /// If null then MultiFormatReader is used</param>
      /// <param name="createLuminanceSource">Sets the function to create a luminance source object for a bitmap.
      /// If null, an exception is thrown when Decode is called</param>
      /// <param name="createBinarizer">Sets the function to create a binarizer object for a luminance source.
      /// If null then HybridBinarizer is used</param>
      public BarcodeReader(Reader reader,
         Func<Color32[], int, int, LuminanceSource> createLuminanceSource,
         Func<LuminanceSource, Binarizer> createBinarizer
      )
         : this(reader, createLuminanceSource, createBinarizer, null)
      {
      }

      /// <summary>
      /// Initializes a new instance of the <see cref="BarcodeReader"/> class.
      /// </summary>
      /// <param name="reader">Sets the reader which should be used to find and decode the barcode.
      /// If null then MultiFormatReader is used</param>
      /// <param name="createLuminanceSource">Sets the function to create a luminance source object for a bitmap.
      /// If null, an exception is thrown when Decode is called</param>
      /// <param name="createBinarizer">Sets the function to create a binarizer object for a luminance source.
      /// If null then HybridBinarizer is used</param>
      /// <param name="createRGBLuminanceSource">Sets the function to create a luminance source object for a rgb raw byte array.</param>
      public BarcodeReader(Reader reader,
         Func<Color32[], int, int, LuminanceSource> createLuminanceSource,
         Func<LuminanceSource, Binarizer> createBinarizer,
         Func<byte[], int, int, RGBLuminanceSource.BitmapFormat, LuminanceSource> createRGBLuminanceSource
      )
         : base(reader, createBinarizer, createRGBLuminanceSource)
      {
         this.createLuminanceSource = createLuminanceSource ?? defaultCreateLuminanceSource;
      }

      /// <summary>
      /// Optional: Gets or sets the function to create a luminance source object for a bitmap.
      /// If null a platform specific default LuminanceSource is used
      /// </summary>
      /// <value>
      /// The function to create a luminance source object.
      /// </value>
      protected Func<Color32[], int, int, LuminanceSource> CreateLuminanceSource
      {
         get
         {
            return createLuminanceSource;
         }
      }

      /// <summary>
      /// Decodes the specified barcode bitmap.
      /// </summary>
      /// <param name="rawColor32"></param>
      /// <param name="width"></param>
      /// <param name="height"></param>
      /// <returns>the result data or null</returns>
      public Result Decode(Color32[] rawColor32, int width, int height)
      {
         if (CreateLuminanceSource == null)
         {
            throw new InvalidOperationException("You have to declare a luminance source delegate.");
         }

         if (rawColor32 == null)
            throw new ArgumentNullException("rawColor32");

         var luminanceSource = CreateLuminanceSource(rawColor32, width, height);

         return Decode(luminanceSource);
      }

      /// <summary>
      /// Decodes the specified barcode bitmap.
      /// </summary>
      /// <param name="rawColor32"></param>
      /// <param name="width"></param>
      /// <param name="height"></param>
      /// <returns>the result data or null</returns>
      public Result[] DecodeMultiple(Color32[] rawColor32, int width, int height)
      {
         if (CreateLuminanceSource == null)
         {
            throw new InvalidOperationException("You have to declare a luminance source delegate.");
         }

         if (rawColor32 == null)
            throw new ArgumentNullException("rawColor32");

         var luminanceSource = CreateLuminanceSource(rawColor32, width, height);

         return DecodeMultiple(luminanceSource);
      }
   }
}
