using Elwig.Documents;
using Elwig.Helpers;
using Elwig.Models.Entities;
using Microsoft.EntityFrameworkCore;
using System.Collections.Generic;
using System.ComponentModel.DataAnnotations.Schema;
using System.Data.Entity.Core.Common.CommandTrees.ExpressionBuilder;
using System.Linq;
using System.Threading.Tasks;

namespace Elwig.Models.Dtos {
    public class PaymentVariantSummaryData : DataTable<PaymentVariantSummaryData.PaymentRow> {

        private static readonly (string, string, string?, int?)[] FieldNames = [
            ("Type", "Typ", null, 10),
            ("Variety", "Sorte", null, 40),
            ("Attribute", "Attribut", null, 20),
            ("Cultivation", "Bewirt.", null, 20),
            ("QualityLevel", "Qualitätsstufe", null, 30),
            ("Oe", "Gradation", "°Oe", 20),
            ("Ungeb", "ungebunden", "kg|€/kg", 40),
            ("Geb", "gebunden", "kg|€/kg", 40),
            ("Amount", "Gesamt", "€", 25),
        ];

        public record struct PaymentRow(
            string Type,
            string Variety,
            string? Attribute,
            string? Cultivation,
            string QualityLevel,
            double Oe,
            (int Weight, decimal? Price) Ungeb,
            (int Weight, decimal? Price) Geb,
            decimal Amount
        );

        public PaymentVariantSummaryData(PaymentVar v, IEnumerable<PaymentRow> rows) :
            base(PaymentVariantSummary.Name, PaymentVariantSummary.Name, v.Name, rows, FieldNames) {
        }

        public static async Task<PaymentVariantSummaryData> ForPaymentVariant(PaymentVar v, DbSet<PaymentVariantSummaryRow> table) {
            return new(v, (await FromDbSet(table, v.Year, v.AvNr))
                .Select(r => new PaymentRow(r.Type, r.Variety, r.Attribute, r.Cultivation, r.QualityLevel, r.Oe,
                    (r.WeightUngeb, r.PriceUngeb != null ? Utils.DecFromDb(r.PriceUngeb.Value, v.Season.Precision) : null),
                    (r.WeightGeb, r.PriceGeb != null ? Utils.DecFromDb(r.PriceGeb.Value, v.Season.Precision) : null),
                    Utils.DecFromDb(r.Amount, v.Season.Precision)))
                .ToArray());
        }

        private static async Task<IEnumerable<PaymentVariantSummaryRow>> FromDbSet(DbSet<PaymentVariantSummaryRow> table, int year, int avnr) {
            return await table.FromSqlRaw($"""
                SELECT v.type AS type,
                       v.name AS variety,
                       a.name AS attribute,
                       c.name AS cultivation,
                       q.name AS quality_level,
                       ROUND(kmw * (4.54 + 0.022 * kmw)) AS oe,
                       SUM(IIF(w.discr = '_', w.value, 0)) AS weight_ungeb,
                       MAX(IIF(w.discr = '_', b.price, NULL)) AS price_ungeb,
                       SUM(IIF(w.discr != '_', w.value, 0)) AS weight_geb,
                       MAX(IIF(w.discr != '_', b.price, NULL)) AS price_geb,
                       SUM(b.amount) AS amount
                FROM payment_delivery_part_bucket b
                    LEFT JOIN delivery_part_bucket w ON (w.year, w.did, w.dpnr, w.bktnr) = (b.year, b.did, b.dpnr, b.bktnr)
                    LEFT JOIN delivery_part p ON (p.year, p.did, p.dpnr) = (b.year, b.did, b.dpnr)
                    LEFT JOIN delivery d ON (d.year, d.did) = (p.year, p.did)
                    LEFT JOIN wine_variety v ON v.sortid = p.sortid
                    LEFT JOIN wine_attribute a ON a.attrid = p.attrid
                    LEFT JOIN wine_cultivation c ON c.cultid = p.cultid
                    LEFT JOIN wine_quality_level q ON q.qualid = p.qualid
                WHERE d.year = {year} AND b.avnr = {avnr}
                GROUP BY variety, attribute, cultivation, q.min_kmw, oe
                ORDER BY variety, attribute, cultivation, q.min_kmw, oe
                """).ToListAsync();
        }
    }

    [Keyless]
    public class PaymentVariantSummaryRow {
        [Column("type")]
        public required string Type { get; set; }
        [Column("variety")]
        public required string Variety { get; set; }
        [Column("attribute")]
        public string? Attribute { get; set; }
        [Column("cultivation")]
        public string? Cultivation { get; set; }
        [Column("quality_level")]
        public required string QualityLevel { get; set; }
        [Column("oe")]
        public double Oe { get; set; }
        [Column("weight_ungeb")]
        public int WeightUngeb { get; set; }
        [Column("price_ungeb")]
        public long? PriceUngeb { get; set; }
        [Column("weight_geb")]
        public int WeightGeb { get; set; }
        [Column("price_geb")]
        public long? PriceGeb { get; set; }
        [Column("amount")]
        public long Amount { get; set; }
    }
}