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// -----------------------------------------------------------------------

// <copyright file="TestDifferencer.cs" company="Microsoft">

// TODO: Update copyright text.

// </copyright>

// -----------------------------------------------------------------------

using System.Collections;

using NUnit.Framework;

using Pithos.Interfaces;

namespace Pithos.Core.Test

{

    using System;

    using System.Collections.Generic;

    using System.Linq;

    using System.Text;

    using Pithos.Core.Agents;

    [TestFixture]

    public class TestDifferencer

    {

        private ObjectInfo[] _previous;

        private ObjectInfo[] _current;

        [SetUp]

        public void Setup()

        {

            _previous = new []{

                                new ObjectInfo{Account="acc1",Container="Cont1",Name="Name1",Bytes=123,Hash="aa1",Version=1},

                                new ObjectInfo{Account="acc1",Container="Cont1",Name="Name2",Bytes=123,Hash="aa2",Version=1},

                                new ObjectInfo{Account="acc1",Container="Cont1",Name="Name3",Bytes=123,Hash="aa3",Version=1},

                                new ObjectInfo{Account="acc1",Container="Cont1",Name="Name4",Bytes=123,Hash="aa4",Version=1},

                                new ObjectInfo{Account="acc2",Container="Cont1",Name="Name1",Bytes=123,Hash="aa1",Version=1},

                                new ObjectInfo{Account="acc2",Container="Cont1",Name="Name2",Bytes=123,Hash="aa2",Version=1},

                            };

            _current = new []{

                                new ObjectInfo{Account="acc1",Container="Cont1",Name="Name2",Bytes=123,Hash="aa2",Version=1},

                                new ObjectInfo{Account="acc1",Container="Cont1",Name="Name3",Bytes=123,Hash="aa3",Version=1},

                                new ObjectInfo{Account="acc1",Container="Cont1",Name="Name4",Bytes=1234,Hash="aa45",Version=1},

                                new ObjectInfo{Account="acc1",Container="Cont1",Name="Name5",Bytes=123,Hash="aa5",Version=1},

                                new ObjectInfo{Account="acc2",Container="Cont1",Name="Name1",Bytes=123,Hash="aa1",Version=1},

                                new ObjectInfo{Account="acc2",Container="Cont1",Name="Name2",Bytes=123,Hash="aa2",Version=1},

                           };

        }

        [Test]

        public void when_adding_a_snapshot_for_the_first_time()

        {

            var d1 = new SnapshotDifferencer();            

            var differencer=d1.Post(_previous);

            Assert.That(differencer.Deleted,Is.Empty);

            Assert.That(differencer.Created,Is.EquivalentTo(_previous));

            Assert.That(differencer.Changed,Is.Empty);

            Assert.That(differencer.Unchanged,Is.Empty);

        }

        [Test]

        public void when_adding_a_second_snapshot_with_a_deletion()

        {

            var d1 = new SnapshotDifferencer();            

            var differencer=d1.Post(_previous).Post(_current);

            var deleted=new[]{new ObjectInfo{Account="acc1",Container="Cont1",Name="Name1",Bytes=123,Hash="aa1",Version=1}};

            Assert.That(differencer.Deleted.ToList(),Is.EquivalentTo(deleted)

                .Using((IEqualityComparer) new ObjectInfoComparer()));

        }

        [Test]

        public void when_adding_a_second_snapshot_with_an_addition()

        {

            var d1 = new SnapshotDifferencer();            

            var differencer=d1.Post(_previous).Post(_current);

            var created = new[] { new ObjectInfo { Account = "acc1", Container = "Cont1", Name = "Name5", Bytes = 123, Hash = "aa5", Version = 1 } };

            Assert.That(differencer.Created.ToList(), Is.EquivalentTo(created)

                .Using((IEqualityComparer)new ObjectInfoComparer()));

        }

        [Test]

        public void when_adding_a_second_snapshot_with_a_change()

        {

            var d1 = new SnapshotDifferencer();            

            var differencer=d1.Post(_previous).Post(_current);

            var changed = new[] { new ObjectInfo { Account = "acc1", Container = "Cont1", Name = "Name4", Bytes = 1234, Hash = "aa45", Version = 1 } };

            Assert.That(differencer.Changed.ToList(), Is.EquivalentTo(changed)

                .Using((IEqualityComparer)new ObjectInfoComparer()));

        }

        [Test]

        public void when_adding_a_second_snapshot_with_unchanged()

        {

            var d1 = new SnapshotDifferencer();            

            var differencer=d1.Post(_previous).Post(_current);

            var unchanged = new[]

                                {

                                new ObjectInfo{Account="acc1",Container="Cont1",Name="Name2",Bytes=123,Hash="aa2",Version=1},

                                new ObjectInfo{Account="acc1",Container="Cont1",Name="Name3",Bytes=123,Hash="aa3",Version=1},

                                new ObjectInfo{Account="acc2",Container="Cont1",Name="Name1",Bytes=123,Hash="aa1",Version=1},

                                new ObjectInfo{Account="acc2",Container="Cont1",Name="Name2",Bytes=123,Hash="aa2",Version=1},                                    

                                };            

            Assert.That(differencer.Unchanged.ToList(), Is.EquivalentTo(unchanged)

                .Using((IEqualityComparer)new ObjectInfoComparer()));

        }

        [Test]

        public void when_adding_a_null_first_snapshot()

        {

            var d1 = new SnapshotDifferencer();            

            var differencer=d1.Post(null);

            Assert.That(differencer.Deleted, Is.Empty);

            Assert.That(differencer.Created, Is.Empty);

            Assert.That(differencer.Changed, Is.Empty);

            Assert.That(differencer.Unchanged, Is.Empty);

        }

        [Test]

        public void when_adding_a_null_second_snapshot()

        {

            var d1 = new SnapshotDifferencer();            

            var differencer=d1.Post(_previous).Post(null);

            Assert.That(differencer.Deleted, Is.EquivalentTo(_previous));

            Assert.That(differencer.Created, Is.Empty);

            Assert.That(differencer.Changed, Is.Empty);

            Assert.That(differencer.Unchanged, Is.Empty);

        }

    }

}