using System;
using System.Linq;
using LeafWeb.Core.Entities;
using LeafWeb.WebCms.Models;

namespace LeafWeb.WebCms.Utility
{
    internal static class QueryFilter
    {
        public static IQueryable<LeafInput> Search(IQueryable<LeafInput> resultItems, LeafDataQuery query)
        {
            // search functionality
            if (!string.IsNullOrEmpty(query.q))
            {
                foreach (var piece in query.q.Split(' ').Select(p => p.Trim()))
                {
                    resultItems =
                        from li in resultItems
                        where li.Name.Contains(piece)
                              || li.Identifier.Contains(piece)
                              || li.SiteId.Contains(piece)
                        select li;
                }
            }

            if (!string.IsNullOrEmpty(query.species))
            {
                resultItems =
                    from li in resultItems
                    where li.LeafInputData.Any(lid => lid.MajorSpecies.Contains(query.species))
                    select li;
            }

            if (!string.IsNullOrEmpty(query.siteid))
            {
                resultItems =
                    from li in resultItems
                    where li.SiteId.Contains(query.siteid)
                    select li;
            }

            if (!string.IsNullOrEmpty(query.lat))
            {
                var latitude = int.Parse(query.lat);
                var range = 0;
                if (!string.IsNullOrEmpty(query.latr))
                {
                    range = int.Parse(query.latr);
                }

                resultItems =
                    from li in resultItems
                    where li.LeafInputData.Any(lid =>
                        lid.Site.Latitude >= latitude - range &&
                        lid.Site.Latitude <= latitude + range)
                    select li;
            }

            if (!string.IsNullOrEmpty(query.lon))
            {
                var longitude = int.Parse(query.lon);
                var range = 0;
                if (!string.IsNullOrEmpty(query.lonr))
                {
                    range = int.Parse(query.lonr);
                }

                resultItems =
                    from li in resultItems
                    where li.LeafInputData.Any(lid =>
                        lid.Site.Longitude >= longitude - range &&
                        lid.Site.Longitude <= longitude + range)
                    select li;
            }
            
            // co2s
            if (!string.IsNullOrEmpty(query.co2s))
            {
                var p = double.Parse(query.co2s);

                resultItems =
                    from li in resultItems
                        where
                            // maximum range inside LeafInputFiles
                            li.LeafInputData.Max(lid =>
                                // range of LeafInputData
                                lid.Data.Max(d => d.CO2S) 
                                - lid.Data.Min(d => d.CO2S))
                            >= p
                    select li;
            }

            return resultItems;
        }
    }
}