using ComiServ.Models;
using Microsoft.EntityFrameworkCore.Metadata.Conventions;
using System.CodeDom;
using System.Security.Policy;

namespace ComiServUnitTest;

[TestClass]
public class PaginatedTests
{
	[TestMethod]
	public void PageUnderUnderflow()
	{
		const int pageNum = 1;
		const int pageSize = 20;
		const int dataSize = 30;
		var data = Enumerable.Range(0, dataSize).ToArray();
		var page = new Paginated<int>(pageSize, pageNum, data);
		Assert.IsTrue(page.Last);
		Assert.AreEqual(pageSize, page.Max);
		Assert.AreEqual(pageNum, page.Page);
		Assert.AreEqual(10, page.Count);
		Assert.AreEqual(page.Items.Count, page.Count);
		Assert.AreEqual(20, page.Items.First());
		Assert.AreEqual(data.Last(), page.Items.Last());
	}
	[TestMethod]
	public void PageOverflow()
	{
		const int pageNum = 2;
		const int pageSize = 30;
		const int dataSize = 150;
		var data = Enumerable.Range(0, dataSize).ToArray();
		var page = new Paginated<int>(pageSize, pageNum, data);
		Assert.IsFalse(page.Last);
		Assert.AreEqual(pageSize, page.Max);
		Assert.AreEqual(pageNum, page.Page);
		Assert.AreEqual(pageSize, page.Count);
		Assert.AreEqual(page.Items.Count, page.Count);
		Assert.AreEqual(pageSize*pageNum, page.Items.First());
		Assert.AreEqual(pageSize*(pageNum+1)-1, page.Items.Last());
	}
	[TestMethod]
	public void PageExact()
	{
		const int pageNum = 1;
		const int pageSize = 30;
		const int dataSize = 60;
		var data = Enumerable.Range(0, dataSize).ToArray();
		var page = new Paginated<int>(pageSize, pageNum, data);
		Assert.IsTrue(page.Last);
		Assert.AreEqual(pageSize, page.Max);
		Assert.AreEqual(pageNum, page.Page);
		Assert.AreEqual(pageSize, page.Count);
		Assert.AreEqual(page.Items.Count, page.Count);
		Assert.AreEqual(pageSize * pageNum, page.Items.First());
		Assert.AreEqual(data.Last(), page.Items.Last());
	}
	[TestMethod]
	public void PageEmpty()
	{
		const int pageNum = 0;
		const int pageSize = 10;
		const int dataSize = 0;
		var data = Enumerable.Range(0, dataSize).ToArray();
		var page = new Paginated<int>(pageSize, pageNum, data);
		Assert.IsTrue(page.Last);
		Assert.AreEqual(pageSize, page.Max);
		Assert.AreEqual(pageNum, page.Page);
		Assert.AreEqual(page.Items.Count, page.Count);
		Assert.IsFalse(page.Items.Any());
	}
	[TestMethod]
	public void PageDoesntExist()
	{
		const int pageNum = 5;
		const int pageSize = 20;
		const int dataSize = 50;
		var data = Enumerable.Range(0, dataSize).ToArray();
		var page = new Paginated<int>(pageSize, pageNum, data);
		Assert.IsTrue(page.Last);
		Assert.AreEqual(pageSize, page.Max);
		Assert.AreEqual(pageNum, page.Page);
		Assert.AreEqual(page.Items.Count, page.Count);
		Assert.IsFalse(page.Items.Any());
	}
}