using Elwig.Helpers;
using Elwig.Models.Entities;
using System;
using System.Collections.Generic;
using System.Linq;

namespace Elwig.Models.Dtos {
    public class MemberMovementData : DataTable<MemberMovementDataRow> {

        private static readonly (string, string, string?, int)[] FieldNames = [
            ("Type", "\u2026 durch", null, 30),
            ("MgNr", "MgNr.", null, 12),
            ("Name1", "Name", null, 40),
            ("Name2", "Vorname", null, 25),
            ("Address", "Adresse", null, 50),
            ("Plz", "PLZ", null, 10),
            ("Locality", "Ort", null, 50),
            ("Date", "Datum", null, 20),
            ("SharesOld", "GA\nalt", null, 10),
            ("SharesDiff", "GA\nDiff.", null, 10),
            ("SharesNew", "GA\nneu", null, 10),
            ("Costs", "Kosten", "€", 15),
        ];

        private MemberMovementData(string name, IEnumerable<(string? Name, IEnumerable<MemberMovementDataRow> Rows)> sections) :
            base("Mitgl.-Bewegungen", name, sections, FieldNames) {
        }

        public static MemberMovementData FromMemberHistory(string name, IEnumerable<MemberHistory> rows, Dictionary<int, SortedDictionary<DateOnly, MemberHistoryPoint>> history) {
            (string? Name, List<MemberMovementDataRow> Rows)[] sections = [
                ("Beitritt", []),
                ("Nachzeichnung (GA)", []),
                ("Überschreibung", []),
                ("Kündigung (GA)", []),
                ("Austritt", []),
            ];
            foreach (var h in rows.OrderBy(r => r.DateNotice).ThenBy(r => r.ToMgNr).ThenBy(r => r.FromMgNr)) {

                int cat;
                if (h.ToMgNr == h.FromMgNr) {
                    // Umwandlung
                    if (h.ToType == BusinessShareType.Dormant) {
                        // Kündigung (GA)
                        cat = 3;
                    } else if (h.FromType == h.ToType) {
                        // Überschreibung
                        cat = 2;
                    } else {
                        throw new NotImplementedException();
                    }
                } else if (h.DateNotice <= h.ToMember?.EntryDate && h.DateNotice >= h.FromMember?.ExitDate) {
                    // Überschreibung
                    cat = 2;
                } else if (h.DateNotice <= h.ToMember?.EntryDate) {
                    // Beitritt
                    cat = 0;
                } else if (h.DateNotice >= h.FromMember?.ExitDate) {
                    // Austritt
                    cat = 4;
                } else if (h.ToMember == null) {
                    // Auszahlung
                    continue;
                } else {
                    // Nachzeichnung (GA)
                    cat = 1;
                }

                Member a;
                Member? b = null;
                if (h.FromMember != null && h.ToMember != null) {
                    if (cat <= 1) {
                        a = h.ToMember;
                        b = h.FromMember;
                    } else {
                        a = h.FromMember;
                        b = h.ToMember;
                    }
                } else if (h.FromMember != null) {
                    a = h.FromMember;
                } else if (h.ToMember != null) {
                    a = h.ToMember;
                } else {
                    throw new ArgumentException();
                }

                var oldA = history[a.MgNr].GetValueOrDefault(h.DateNotice);
                var d = new MemberMovementDataRow {
                    Type = [h.ReasonPretty],

                    MgNr = [a.MgNr],
                    Name1 = [a.Name],
                    Name2 = [a.AdministrativeName2],
                    Address = [a.Address],
                    Plz = [a.PostalDest.AtPlz!.Plz],
                    Locality = [a.PostalDest.AtPlz.Ort.Name],

                    Date = h.DateNotice,
                    SharesOld = [oldA.Shares + oldA.SharesRed + oldA.SharesWhite],
                    SharesDiff = [cat != 3 && a == h.ToMember ? h.Shares : -h.Shares],
                    Costs = [h.FromMember == null ? h.TotalValue : null],
                };
                d.SharesNew = [d.SharesOld[^1] + (h.FromMgNr == h.ToMgNr ? 0 : d.SharesDiff[^1])];

                if (b != null) {
                    var oldB = history[b.MgNr].GetValueOrDefault(h.DateNotice);
                    d.Type = [..d.Type, "\u2026 " + (cat <= 1 ? "von" : "an")];

                    d.MgNr = [.. d.MgNr, b.MgNr];
                    d.Name1 = [.. d.Name1, b.Name];
                    d.Name2 = [.. d.Name2, b.AdministrativeName2];
                    d.Address = [.. d.Address, b.Address];
                    d.Plz = [.. d.Plz, b.PostalDest.AtPlz!.Plz];
                    d.Locality = [.. d.Locality, b.PostalDest.AtPlz.Ort.Name];

                    d.SharesOld = [.. d.SharesOld, oldB.Shares + oldB.SharesRed + oldB.SharesWhite];
                    d.SharesDiff = [.. d.SharesDiff, b == h.ToMember ? h.Shares : -h.Shares];
                    d.SharesNew = [.. d.SharesNew, d.SharesOld[^1] + d.SharesDiff[^1]];
                }

                sections[cat].Rows.Add(d);
            }
            return new MemberMovementData($"Mitglieder-Bewegungen {name}", sections.Select(s => (s.Name, (IEnumerable<MemberMovementDataRow>)s.Rows)));
        }
    }

    public class MemberMovementDataRow {
        public string[] Type = [];

        public int[] MgNr = [];
        public string[] Name1 = [];
        public string?[] Name2 = [];
        public string[] Address = [];
        public int[] Plz = [];
        public string[] Locality = [];

        public DateOnly Date;
        public int?[] SharesOld = [];
        public int[] SharesDiff = [];
        public int?[] SharesNew = [];
        public decimal?[] Costs = [];
    }
}