using Xunit;
using Aurora.Services.Signal;
using Aurora.Cursor;
using System.Collections.Generic;
using System.Linq;

namespace AuroraCradle.test
{
    public class CursorListTest
    {
        [Theory()]
        [InlineData(Aurora.Cursor.SortDirection.Asc)]
        [InlineData(Aurora.Cursor.SortDirection.Desc)]
        public void CursorListSortOnStringValue(Aurora.Cursor.SortDirection direction)
        {
            CursorList<Party> list = new CursorList<Party>();
            list.Add(new Party() { Name = "asdf", Id = Faker.RandomNumber.Next().ToString() });
            list.Add(new Party() { Name = "bsdf", Id = Faker.RandomNumber.Next().ToString() });
            list.Add(new Party() { Name = "csdf", Id = Faker.RandomNumber.Next().ToString() });

            CursorResult<Party> result = new Cursor<Party>(ref list)
                .WithSort(item => item.Value.Name, direction)
                .GetNextPage();

            if (direction == Aurora.Cursor.SortDirection.Desc)
            {
                Assert.Collection<Party>(result.Result,
                    item => item.Name.Equals("asdf"),
                    item => item.Name.Equals("bsdf"),
                    item => item.Name.Equals("csdf"));
            }
            else
            {
                Assert.Collection<Party>(result.Result,
                    item => item.Name.Equals("csdf"),
                    item => item.Name.Equals("bsdf"),
                    item => item.Name.Equals("asdf"));

            }
        }

        [Theory()]
        [InlineData(2)]
        [InlineData(10)]
        [InlineData(49)]
        [InlineData(51)]
        [InlineData(-1)]
        public void CursorListSizeTest(int size)
        {
            int numOfItems = 50;
            CursorList<Party> list = new CursorList<Party>();

            // Add items to cursor list
            for (int i = 0; i < numOfItems; i++)
            {
                list.Add(new Party()
                {
                    Name = string.Join(" ",
                    Faker.Lorem.Words(2)),
                    Id = Faker.RandomNumber.Next().ToString()
                });
            }

            Cursor<Party> cursor = new Cursor<Party>(ref list);
            if (size < 0)
            {
                Assert.Throws<System.InvalidOperationException>(() =>
                {
                    cursor.WithSize(size).GetNextPage();
                });
            }
            else if (size > numOfItems)
            {
                CursorResult<Party> res = cursor.WithSize(size).GetNextPage();
                Assert.Equal(res.Result.Count, numOfItems);
            }
            else if (size < numOfItems && size > 0)
            {
                CursorResult<Party> res = cursor.WithSize(size).GetNextPage();
                Assert.Equal(res.Result.Count, size);
            }
        }

        [Theory()]
        [InlineData(2)]
        [InlineData(10)]
        [InlineData(3)]
        public void CursorPaginationTest(int pageSize)
        {
            int numOfItems = 50;
            CursorList<Party> list = new CursorList<Party>();

            // Add items to cursor list
            for (int i = 0; i < numOfItems; i++)
            {
                list.Add(new Party()
                {
                    Name = string.Join(" ",
                    Faker.Lorem.Words(2)),
                    Id = Faker.RandomNumber.Next().ToString()
                });
            }

            string pageToken = null;
            Cursor<Party> cursor = new Cursor<Party>(ref list);
            List<Party> pagedResults = new List<Party>();
            while (pageToken != string.Empty)
            {
                CursorResult<Party> res = cursor
                    .WithSize(pageSize)
                    .WithNextPageToken(pageToken)
                    .GetNextPage();

                pagedResults.AddRange(res.Result);
                pageToken = res.NextPageToken;
            }

            Assert.Equal(pagedResults.Count, numOfItems);
        }

        [Fact()]

        public void CursorPaginationWithSortTest()
        {
            int numOfItems = 50;
            CursorList<Party> cursorList = new CursorList<Party>();

            // Add items to cursor list
            for (int i = 0; i < numOfItems; i++)
            {
                cursorList.Add(new Party()
                {
                    Name = string.Join(" ",
                    Faker.Lorem.Words(2)),
                    Id = Faker.RandomNumber.Next().ToString()
                });
            }

            var orderedList = cursorList.ToList().OrderBy(item => item.Value.Name).ToList().ConvertAll(item => item.Value);

            string pageToken = null;
            Cursor<Party> cursor = new Cursor<Party>(ref cursorList);
            List<Party> pagedResults = new List<Party>();
            while (pageToken != string.Empty)
            {
                CursorResult<Party> res = cursor
                    .WithSize(10)
                    .WithSort(item => item.Value.Name, Aurora.Cursor.SortDirection.Asc)
                    .WithNextPageToken(pageToken)
                    .GetNextPage();

                pagedResults.AddRange(res.Result);
                pageToken = res.NextPageToken;
            }

            var list = cursorList.ToList();
            for (int i = 0; i < orderedList.Count; i++)
            {
                Assert.Equal(orderedList[i], pagedResults[i]);
            }
        }
    }
}