using Elwig.Helpers.Billing;
using Elwig.Models.Entities;
using Microsoft.EntityFrameworkCore;
using System;
using System.Collections.Generic;
using System.ComponentModel.DataAnnotations.Schema;
using System.Linq;
using System.Threading.Tasks;

namespace Elwig.Models.Dtos {
    public class CreditNoteDeliveryData : DataTable<CreditNoteDeliveryRow> {

        private static readonly (string, string, string?)[] FieldNames = [
            ("", "", null), // TODO
        ];

        private readonly int Year;
        private readonly int? TgNr;
        private readonly int? AvNr;
        private readonly int? MgNr;

        private CreditNoteDeliveryData(IEnumerable<CreditNoteDeliveryRow> rows, int year, int? tgnr, int? avnr = null, int? mgnr = null) :
            base($"Traubengutschrift {year}/{tgnr}", rows, FieldNames) {
            Year = year;
            TgNr = tgnr;
            AvNr = avnr;
            MgNr = mgnr;
        }

        public static async Task<IDictionary<int, CreditNoteDeliveryData>> ForPaymentVariant(DbSet<CreditNoteDeliveryRowSingle> table, DbSet<Season> seasons, int year, int avnr) {
            var variant = (await seasons.FindAsync(year))?.PaymentVariants.Where(v => v.AvNr == avnr).SingleOrDefault();
            BillingData? varData = null;
            try { varData = variant != null ? BillingData.FromJson(variant.Data) : null; } catch { }
            return (await FromDbSet(table, year, avnr))
                .GroupBy(
                    r => new { r.Year, r.AvNr, r.MgNr, r.TgNr, r.DId, r.DPNr },
                    (k, g) => new CreditNoteDeliveryRow(g, seasons, varData?.NetWeightModifier ?? 0.0, varData?.GrossWeightModifier ?? 0.0))
                .GroupBy(
                    r => new { r.Year, r.AvNr, r.MgNr, r.TgNr },
                    (k, g) => new CreditNoteDeliveryData(g, k.Year, k.TgNr, mgnr: k.MgNr))
                .ToDictionary(d => d.MgNr ?? 0);
        }

        private static async Task<IEnumerable<CreditNoteDeliveryRowSingle>> FromDbSet(DbSet<CreditNoteDeliveryRowSingle> table, int? year = null, int? avnr = null, int? mgnr = null) {
            var y = year?.ToString() ?? "NULL";
            var v = avnr?.ToString() ?? "NULL";
            var m = mgnr?.ToString() ?? "NULL";
            return await table.FromSqlRaw($"""
                SELECT d.year, c.tgnr, v.avnr, d.mgnr, d.did, d.lsnr, d.dpnr, d.weight, d.modifiers,
                       b.bktnr, d.sortid, b.discr, b.value, pb.price, pb.amount, p.net_amount, p.amount AS total_amount,
                       s.name AS variety, a.name AS attribute, c.name AS cultivation, q.qualid AS qualid, q.name AS quality_level, d.oe, d.kmw, d.net_weight
                FROM v_delivery d
                    JOIN wine_variety s ON s.sortid = d.sortid
                    LEFT JOIN wine_attribute a ON a.attrid = d.attrid
                    LEFT JOIN wine_cultivation c ON c.cultid = d.cultid
                    JOIN wine_quality_level q ON q.qualid = d.qualid
                    LEFT JOIN delivery_part_bucket b ON (b.year, b.did, b.dpnr) = (d.year, d.did, d.dpnr)
                    LEFT JOIN payment_variant v ON v.year = d.year
                    LEFT JOIN payment_delivery_part p ON (p.year, p.did, p.dpnr, p.avnr) = (d.year, d.did, d.dpnr, v.avnr)
                    LEFT JOIN payment_delivery_part_bucket pb ON (pb.year, pb.did, pb.dpnr, pb.bktnr, pb.avnr) = (b.year, b.did, b.dpnr, b.bktnr, v.avnr)
                    LEFT JOIN credit c ON (c.year, c.avnr, c.mgnr) = (d.year, v.avnr, d.mgnr)
                WHERE b.value > 0 AND (d.year = {y} OR {y} IS NULL) AND (v.avnr = {v} OR {v} IS NULL) AND (d.mgnr = {m} OR {m} IS NULL)
                ORDER BY d.year, v.avnr, d.mgnr, d.lsnr, d.dpnr
                """).ToListAsync();
        }
    }

    public class CreditNoteDeliveryRow {

        public int Year;
        public int? TgNr;
        public int? AvNr;
        public int MgNr;

        public string LsNr;
        public int DPNr;
        public string Variety;
        public string? Attribute;
        public string? Cultivation;
        public string[] Modifiers;
        public string QualId;
        public string QualityLevel;
        public (double Oe, double Kmw) Gradation;
        public (string Name, int Value, decimal? Price, decimal? Amount)[] Buckets;
        public decimal? TotalModifiers;
        public decimal? Amount;
        public double WeighingModifier;

        public CreditNoteDeliveryRow(IEnumerable<CreditNoteDeliveryRowSingle> rows, DbSet<Season> seasons, double netWeightModifier, double grossWeightModifier) {
            var f = rows.First();
            Year = f.Year;
            TgNr = f.TgNr;
            AvNr = f.AvNr;
            MgNr = f.MgNr;
            var season = seasons.Find(Year);

            LsNr = f.LsNr;
            DPNr = f.DPNr;
            Variety = f.Variety;
            Attribute = f.Attribute;
            Cultivation = f.Cultivation;
            var modifiers = (IEnumerable<Modifier>)(f.Modifiers ?? "").Split(',')
                .Select(m => season?.Modifiers.FirstOrDefault(s => s.ModId == m))
                .Where(m => m != null)
                .OrderBy(m => m.Ordering)
                .ToList();
            Modifiers = modifiers.Select(m => m.Name).ToArray();
            QualId = f.QualId;
            QualityLevel = f.QualityLevel;
            Gradation = (f.Oe, f.Kmw);
            Buckets = rows
                .Where(b => b.Value > 0)
                .OrderByDescending(b => b.BktNr)
                .Select(b => (b.Discr == "_" ? "ungeb." : $"geb. {f.SortId}{b.Discr}", b.Value,
                              b.Price != null ? season?.DecFromDb((long)b.Price) : null,
                              b.Amount != null ? season?.DecFromDb((long)b.Amount) : null))
                .ToArray();
            WeighingModifier = f.NetWeight ? netWeightModifier : grossWeightModifier;
            Amount = f.TotalAmount != null ? season?.DecFromDb((long)f.TotalAmount) : null;
            var netAmount = f.NetAmount != null ? season?.DecFromDb((long)f.NetAmount) : null;
            var amt = netAmount * (decimal)(1.0 + WeighingModifier);
            TotalModifiers = Amount - (amt != null ? Math.Round((decimal)amt, season?.Precision ?? 0) : null);
        }
    }

    [Keyless]
    public class CreditNoteDeliveryRowSingle {
        [Column("year")]
        public int Year { get; set; }
        [Column("tgnr")]
        public int? TgNr { get; set; }
        [Column("avnr")]
        public int? AvNr { get; set; }
        [Column("mgnr")]
        public int MgNr { get; set; }
        [Column("did")]
        public int DId { get; set; }
        [Column("lsnr")]
        public required string LsNr { get; set; }
        [Column("dpnr")]
        public int DPNr { get; set; }
        [Column("weight")]
        public int Weight { get; set; }
        [Column("modifiers")]
        public string? Modifiers { get; set; }
        [Column("bktnr")]
        public int BktNr { get; set; }
        [Column("sortid")]
        public required string SortId { get; set; }
        [Column("discr")]
        public required string Discr { get; set; }
        [Column("value")]
        public int Value { get; set; }
        [Column("price")]
        public long? Price { get; set; }
        [Column("amount")]
        public long? Amount { get; set; }
        [Column("net_amount")]
        public long? NetAmount { get; set; }
        [Column("total_amount")]
        public long? TotalAmount { 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("qualid")]
        public required string QualId { get; set; }
        [Column("quality_level")]
        public required string QualityLevel { get; set; }
        [Column("oe")]
        public double Oe { get; set; }
        [Column("kmw")]
        public double Kmw { get; set; }
        [Column("net_weight")]
        public bool NetWeight { get; set; }
    }
}