MoneyMap/MoneyMap/Pages/Transactions.cshtml.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;
using Microsoft.AspNetCore.Mvc;
using Microsoft.AspNetCore.Mvc.RazorPages;
using Microsoft.EntityFrameworkCore;
using MoneyMap.Data;
using MoneyMap.Models;

namespace MoneyMap.Pages
{
    public class TransactionsModel : PageModel
    {
        private readonly MoneyMapContext _db;

        public TransactionsModel(MoneyMapContext db)
        {
            _db = db;
        }

        [BindProperty(SupportsGet = true)]
        public string? Category { get; set; }

        [BindProperty(SupportsGet = true)]
        public string? CardId { get; set; }

        [BindProperty(SupportsGet = true)]
        public DateTime? StartDate { get; set; }

        [BindProperty(SupportsGet = true)]
        public DateTime? EndDate { get; set; }

        public List<TransactionRow> Transactions { get; set; } = new();
        public List<string> AvailableCategories { get; set; } = new();
        public List<Card> AvailableCards { get; set; } = new();
        public TransactionStats Stats { get; set; } = new();

        public async Task OnGetAsync()
        {
            var query = _db.Transactions.Include(t => t.Card).AsQueryable();

            // Apply filters
            if (!string.IsNullOrWhiteSpace(Category))
            {
                if (Category == "(blank)")
                {
                    query = query.Where(t => string.IsNullOrWhiteSpace(t.Category));
                }
                else
                {
                    query = query.Where(t => t.Category == Category);
                }
            }

            if (!string.IsNullOrWhiteSpace(CardId) && int.TryParse(CardId, out int cardIdInt))
            {
                query = query.Where(t => t.CardId == cardIdInt);
            }

            if (StartDate.HasValue)
            {
                query = query.Where(t => t.Date >= StartDate.Value);
            }

            if (EndDate.HasValue)
            {
                query = query.Where(t => t.Date <= EndDate.Value);
            }

            // Get transactions
            var transactions = await query
                .OrderByDescending(t => t.Date)
                .ThenByDescending(t => t.Id)
                .ToListAsync();

            Transactions = transactions.Select(t => new TransactionRow
            {
                Id = t.Id,
                Date = t.Date,
                Name = t.Name,
                Memo = t.Memo,
                Amount = t.Amount,
                Category = t.Category ?? "",
                Notes = t.Notes ?? "",
                CardLabel = t.Card != null
                    ? $"{t.Card.Issuer} {t.Card.Last4}"
                    : (string.IsNullOrEmpty(t.CardLast4) ? "" : $"•••• {t.CardLast4}"),
                ReceiptCount = t.Receipts?.Count ?? 0
            }).ToList();

            // Calculate stats for filtered results
            Stats = new TransactionStats
            {
                Count = transactions.Count,
                TotalDebits = transactions.Where(t => t.Amount < 0).Sum(t => t.Amount),
                TotalCredits = transactions.Where(t => t.Amount > 0).Sum(t => t.Amount),
                NetAmount = transactions.Sum(t => t.Amount)
            };

            // Get available categories for filter dropdown
            AvailableCategories = await _db.Transactions
                .Select(t => t.Category ?? "")
                .Distinct()
                .OrderBy(c => c)
                .ToListAsync();

            // Get available cards for filter dropdown
            AvailableCards = await _db.Cards
                .OrderBy(c => c.Owner)
                .ThenBy(c => c.Last4)
                .ToListAsync();
        }

        public class TransactionRow
        {
            public long Id { get; set; }
            public DateTime Date { get; set; }
            public string Name { get; set; } = "";
            public string Memo { get; set; } = "";
            public decimal Amount { get; set; }
            public string Category { get; set; } = "";
            public string Notes { get; set; } = "";
            public string CardLabel { get; set; } = "";
            public int ReceiptCount { get; set; }
        }

        public class TransactionStats
        {
            public int Count { get; set; }
            public decimal TotalDebits { get; set; }
            public decimal TotalCredits { get; set; }
            public decimal NetAmount { get; set; }
        }
    }
}