// Copyright (c) 2014 AlphaSierraPapa for the SharpDevelop Team
// 
// 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.

using System.IO;
using System.Text;
using AvaloniaEdit.Utils;
using NUnit.Framework;
using Assert = NUnit.Framework.Legacy.ClassicAssert;

namespace AvaloniaEdit.Tests.Utils
{
    [TestFixture]
    public class RopeTests
    {
        [Test]
        public void EmptyRope()
        {
            Rope<char> empty = new Rope<char>();
            Assert.AreEqual(0, empty.Length);
            Assert.AreEqual("", empty.ToString());
        }

        [Test]
        public void EmptyRopeFromString()
        {
            Rope<char> empty = new Rope<char>(string.Empty);
            Assert.AreEqual(0, empty.Length);
            Assert.AreEqual("", empty.ToString());
        }

        [Test]
        public void InitializeRopeFromShortString()
        {
            Rope<char> rope = new Rope<char>("Hello, World");
            Assert.AreEqual(12, rope.Length);
            Assert.AreEqual("Hello, World", rope.ToString());
        }

        private static string BuildLongString(int lines)
        {
            using StringWriter w = new StringWriter();
            w.NewLine = "\n";
            for (int i = 1; i <= lines; i++)
            {
                w.WriteLine(i.ToString());
            }
            return w.ToString();
        }

        [Test]
        public void InitializeRopeFromLongString()
        {
            string text = BuildLongString(1000);
            Rope<char> rope = new Rope<char>(text);
            Assert.AreEqual(text.Length, rope.Length);
            Assert.AreEqual(text, rope.ToString());
            Assert.AreEqual(text.ToCharArray(), rope.ToArray());
        }

        [Test]
        public void TestToArrayAndToStringWithParts()
        {
            string text = BuildLongString(1000);
            Rope<char> rope = new Rope<char>(text);

            string textPart = text.Substring(1200, 600);
            char[] arrayPart = textPart.ToCharArray();
            Assert.AreEqual(textPart, rope.ToString(1200, 600));
            Assert.AreEqual(arrayPart, rope.ToArray(1200, 600));

            Rope<char> partialRope = rope.GetRange(1200, 600);
            Assert.AreEqual(textPart, partialRope.ToString());
            Assert.AreEqual(arrayPart, partialRope.ToArray());
        }

        [Test]
        public void ConcatenateStringToRope()
        {
            StringBuilder b = new StringBuilder();
            Rope<char> rope = new Rope<char>();
            for (int i = 1; i <= 1000; i++)
            {
                b.Append(i.ToString());
                rope.AddText(i.ToString());
                b.Append(' ');
                rope.Add(' ');
            }
            Assert.AreEqual(b.ToString(), rope.ToString());
        }

        [Test]
        public void ConcatenateSmallRopesToRope()
        {
            StringBuilder b = new StringBuilder();
            Rope<char> rope = new Rope<char>();
            for (int i = 1; i <= 1000; i++)
            {
                b.Append(i.ToString());
                b.Append(' ');
                rope.AddRange(CharRope.Create(i.ToString() + " "));
            }
            Assert.AreEqual(b.ToString(), rope.ToString());
        }

        [Test]
        public void AppendLongTextToEmptyRope()
        {
            string text = BuildLongString(1000);
            Rope<char> rope = new Rope<char>();
            rope.AddText(text);
            Assert.AreEqual(text, rope.ToString());
        }

        [Test]
        public void ConcatenateStringToRopeBackwards()
        {
            StringBuilder b = new StringBuilder();
            Rope<char> rope = new Rope<char>();
            for (int i = 1; i <= 1000; i++)
            {
                b.Append(i.ToString());
                b.Append(' ');
            }
            for (int i = 1000; i >= 1; i--)
            {
                rope.Insert(0, ' ');
                rope.InsertText(0, i.ToString());
            }
            Assert.AreEqual(b.ToString(), rope.ToString());
        }

        [Test]
        public void ConcatenateSmallRopesToRopeBackwards()
        {
            StringBuilder b = new StringBuilder();
            Rope<char> rope = new Rope<char>();
            for (int i = 1; i <= 1000; i++)
            {
                b.Append(i.ToString());
                b.Append(' ');
            }
            for (int i = 1000; i >= 1; i--)
            {
                rope.InsertRange(0, CharRope.Create(i.ToString() + " "));
            }
            Assert.AreEqual(b.ToString(), rope.ToString());
        }

        [Test]
        public void ConcatenateStringToRopeByInsertionInMiddle()
        {
            StringBuilder b = new StringBuilder();
            Rope<char> rope = new Rope<char>();
            for (int i = 1; i <= 998; i++)
            {
                b.Append(i.ToString("d3"));
                b.Append(' ');
            }
            int middle = 0;
            for (int i = 1; i <= 499; i++)
            {
                rope.InsertText(middle, i.ToString("d3"));
                middle += 3;
                rope.Insert(middle, ' ');
                middle++;
                rope.InsertText(middle, (999 - i).ToString("d3"));
                rope.Insert(middle + 3, ' ');
            }
            Assert.AreEqual(b.ToString(), rope.ToString());
        }

        [Test]
        public void ConcatenateSmallRopesByInsertionInMiddle()
        {
            StringBuilder b = new StringBuilder();
            Rope<char> rope = new Rope<char>();
            for (int i = 1; i <= 1000; i++)
            {
                b.Append(i.ToString("d3"));
                b.Append(' ');
            }
            int middle = 0;
            for (int i = 1; i <= 500; i++)
            {
                rope.InsertRange(middle, CharRope.Create(i.ToString("d3") + " "));
                middle += 4;
                rope.InsertRange(middle, CharRope.Create((1001 - i).ToString("d3") + " "));
            }
            Assert.AreEqual(b.ToString(), rope.ToString());
        }
    }
}
