using Koogle.Domain.Entities;
using Koogle.Domain.Enums;
using Koogle.Domain.Interfaces;
using KoogleApp.Data;
using Microsoft.EntityFrameworkCore;

namespace Koogle.Infrastructure.Repositories;

/// <summary>
/// Repository implementation for managing cash book entry entities.
/// </summary>
/// <param name="contextFactory">The database context factory for creating scoped contexts.</param>
public class CashBookEntryRepository(IDbContextFactory<AppDbContext> contextFactory) : ICashBookEntryRepository
{
    /// <inheritdoc />
    public async Task<List<CashBookEntry>> GetByClubIdAsync(Guid clubId, DateTime? from, DateTime? to, CancellationToken ct = default)
    {
        await using var context = await contextFactory.CreateDbContextAsync(ct);
        IQueryable<CashBookEntry> query = context.CashBookEntries
            .Where(e => e.ClubId == clubId && !e.IsDeleted);

        if (from.HasValue)
        {
            query = query.Where(e => e.BookingDate >= from.Value);
        }

        if (to.HasValue)
        {
            query = query.Where(e => e.BookingDate <= to.Value);
        }

        return await query
            .Include(e => e.Category)
            .Include(e => e.Person)
            .Include(e => e.Day)
            .OrderByDescending(e => e.BookingDate)
            .ThenByDescending(e => e.CreatedAt)
            .ToListAsync(ct);
    }

    /// <inheritdoc />
    public async Task<CashBookEntry?> GetByIdAsync(Guid id, CancellationToken ct = default)
    {
        await using var context = await contextFactory.CreateDbContextAsync(ct);
        return await context.CashBookEntries
            .Include(e => e.Category)
            .Include(e => e.Person)
            .Include(e => e.Day)
            .FirstOrDefaultAsync(e => e.Id == id && !e.IsDeleted, ct);
    }

    /// <inheritdoc />
    public async Task<decimal> GetBalanceAsync(Guid clubId, DateTime? asOfDate = null, CancellationToken ct = default)
    {
        await using var context = await contextFactory.CreateDbContextAsync(ct);

        // Get initial balance from club
        var club = await context.Clubs.FirstOrDefaultAsync(c => c.Id == clubId, ct);
        var initialBalance = club?.InitialBalance ?? 0m;

        var query = context.CashBookEntries
            .Where(e => e.ClubId == clubId && !e.IsDeleted);

        if (asOfDate.HasValue)
        {
            query = query.Where(e => e.BookingDate <= asOfDate.Value);
        }

        var entries = await query.ToListAsync(ct);

        var income = entries
            .Where(e => e.EntryType == CashBookEntryType.Income)
            .Sum(e => e.Amount);

        var expense = entries
            .Where(e => e.EntryType == CashBookEntryType.Expense)
            .Sum(e => e.Amount);

        return initialBalance + income - expense;
    }

    /// <inheritdoc />
    public async Task<CashBookEntry> AddAsync(CashBookEntry entity, CancellationToken ct = default)
    {
        await using var context = await contextFactory.CreateDbContextAsync(ct);
        entity.Id = Guid.NewGuid();
        entity.CreatedAt = DateTime.UtcNow;
        await context.CashBookEntries.AddAsync(entity, ct);
        await context.SaveChangesAsync(ct);
        return entity;
    }

    /// <inheritdoc />
    public async Task<List<CashBookEntry>> GetByDayIdAsync(Guid dayId, CancellationToken ct = default)
    {
        await using var context = await contextFactory.CreateDbContextAsync(ct);
        return await context.CashBookEntries
            .Where(e => e.DayId == dayId && !e.IsDeleted)
            .Include(e => e.Category)
            .Include(e => e.Person)
            .OrderByDescending(e => e.CreatedAt)
            .ToListAsync(ct);
    }

    /// <inheritdoc />
    public async Task<bool> ExistsMembershipFeeForMonthAsync(Guid clubId, int year, int month, CancellationToken ct = default)
    {
        await using var context = await contextFactory.CreateDbContextAsync(ct);

        // Get the system category for membership fees
        var membershipCategory = await context.BookingCategories
            .FirstOrDefaultAsync(c => c.ClubId == clubId && c.IsSystemCategory && c.Name == "Mitgliedsbeitrag" && !c.IsDeleted, ct);

        if (membershipCategory == null)
        {
            return false;
        }

        var startOfMonth = new DateTime(year, month, 1);
        var endOfMonth = startOfMonth.AddMonths(1).AddDays(-1);

        return await context.CashBookEntries
            .AnyAsync(e => e.ClubId == clubId
                && e.CategoryId == membershipCategory.Id
                && e.BookingDate >= startOfMonth
                && e.BookingDate <= endOfMonth
                && !e.IsDeleted, ct);
    }
}