using AutoMapper;
using AutoMapper.QueryableExtensions;

namespace ExpenseTracker.Application.Common.Models;

public class PaginatedList<T>
{
    public IReadOnlyCollection<T> Items { get; }
    public int PageNumber { get; }
    public int TotalPages { get; }
    public int TotalCount { get; }

    public PaginatedList(IReadOnlyCollection<T> items, int count, int pageNumber, int pageSize)
    {
        PageNumber = pageNumber;
        TotalPages = (int) Math.Ceiling(count / (double) pageSize);
        TotalCount = count;
        Items = items;
    }

    public bool HasPreviousPage => PageNumber > 1;

    public bool HasNextPage => PageNumber < TotalPages;

    public static PaginatedList<T> Create(IQueryable<T> source, int pageNumber, int pageSize)
    {
        var count = source.Count();
        var items = source.Skip((pageNumber - 1) * pageSize).Take(pageSize).ToList();

        return new PaginatedList<T>(items, count, pageNumber, pageSize);
    }

    public static PaginatedList<TDestination> Create<TSource, TDestination>(
        IQueryable<TSource> source,
        int pageNumber,
        int pageSize,
        IConfigurationProvider mappingConfigurationProvider)
    {
        var count = source.Count();
        var items = source.Skip((pageNumber - 1) * pageSize).Take(pageSize).ToList();

        var mappedItems = items.AsQueryable()
            .ProjectTo<TDestination>(mappingConfigurationProvider).ToList();

        return new PaginatedList<TDestination>(mappedItems, count, pageNumber, pageSize);
    }
}