using Duempelkas.Domain.Entities;
using Duempelkas.Domain.Enums;
using Duempelkas.Infrastructure.Persistence;
using Duempelkas.Infrastructure.Services;
using FluentAssertions;
using Microsoft.EntityFrameworkCore;
using Xunit;

namespace Duempelkas.Tests;

public class EntryServiceBookingTests : IDisposable
{
    private readonly FinanceDbContext _db;
    private readonly EntryService _entryService;
    private readonly string _connectionString = $"Data Source=duempelkas-entry-tests-{Guid.NewGuid():N};Mode=Memory;Cache=Shared";

    public EntryServiceBookingTests()
    {
        var options = new DbContextOptionsBuilder<FinanceDbContext>()
            .UseSqlite(_connectionString)
            .Options;

        _db = new FinanceDbContext(options);
        _db.Database.OpenConnection();
        _db.Database.EnsureCreated();

        var dbFactory = new TestDbContextFactory(options);
        _entryService = new EntryService(dbFactory);
    }

    [Fact]
    public async Task CreateEntry_AssignsSequentialDisplayIds_PerYear()
    {
        var accountA = new Account { Name = "Konto A" };
        var accountB = new Account { Name = "Konto B" };
        _db.Accounts.AddRange(accountA, accountB);
        await _db.SaveChangesAsync();

        var first = await _entryService.CreateEntryAsync(accountA.Id, EntryType.Income, new DateTime(2026, 1, 10), "Einnahme A", 100m);
        var second = await _entryService.CreateEntryAsync(accountB.Id, EntryType.Expense, new DateTime(2026, 1, 11), "Ausgabe B", 20m);
        var third = await _entryService.CreateEntryAsync(accountA.Id, EntryType.Income, new DateTime(2027, 1, 1), "Neues Jahr", 5m);

        first.DisplayId.Should().Be("2026-001");
        second.DisplayId.Should().Be("2026-002");
        third.DisplayId.Should().Be("2027-001");
    }

    [Fact]
    public async Task CreateEntry_AfterTransfer_UsesNextDisplayId()
    {
        var source = new Account { Name = "Barkasse" };
        var target = new Account { Name = "Girokonto" };
        _db.Accounts.AddRange(source, target);
        await _db.SaveChangesAsync();

        await _entryService.CreateTransferAsync(source.Id, target.Id, new DateTime(2026, 3, 15), "Umbuchung", 500m);
        var booking = await _entryService.CreateEntryAsync(source.Id, EntryType.Income, new DateTime(2026, 3, 16), "Einzahlung", 50m);

        booking.DisplayId.Should().Be("2026-002");
    }

    [Fact]
    public async Task UpdateEntry_UpdatesBookingFields()
    {
        var account = new Account { Name = "Konto" };
        _db.Accounts.Add(account);
        await _db.SaveChangesAsync();

        var entry = await _entryService.CreateEntryAsync(account.Id, EntryType.Expense, new DateTime(2026, 2, 2), "Alt", 10m);

        await _entryService.UpdateEntryAsync(entry.Id, new DateTime(2026, 2, 3), "Neu", 25m);

        _db.ChangeTracker.Clear();
        var updated = await _db.Entries.SingleAsync(e => e.Id == entry.Id);

        updated.Date.Should().Be(new DateTime(2026, 2, 3));
        updated.Title.Should().Be("Neu");
        updated.Amount.Should().Be(25m);
    }

    [Fact]
    public async Task DeleteAndRestoreEntry_TogglesSoftDelete_ForBookingOnly()
    {
        var account = new Account { Name = "Konto" };
        _db.Accounts.Add(account);
        await _db.SaveChangesAsync();

        var entry = await _entryService.CreateEntryAsync(account.Id, EntryType.Expense, new DateTime(2026, 2, 2), "Buchung", 10m);

        await _entryService.DeleteEntryAsync(entry.Id);

        _db.ChangeTracker.Clear();
        var deleted = await _db.Entries.SingleAsync(e => e.Id == entry.Id);
        deleted.IsDeleted.Should().BeTrue();

        await _entryService.RestoreEntryAsync(entry.Id);

        _db.ChangeTracker.Clear();
        var restored = await _db.Entries.SingleAsync(e => e.Id == entry.Id);
        restored.IsDeleted.Should().BeFalse();
    }

    public void Dispose()
    {
        _db.Database.CloseConnection();
        _db.Dispose();
    }

    private sealed class TestDbContextFactory : IDbContextFactory<FinanceDbContext>
    {
        private readonly DbContextOptions<FinanceDbContext> _options;

        public TestDbContextFactory(DbContextOptions<FinanceDbContext> options)
        {
            _options = options;
        }

        public FinanceDbContext CreateDbContext() => new(_options);

        public Task<FinanceDbContext> CreateDbContextAsync(CancellationToken cancellationToken = default)
            => Task.FromResult(new FinanceDbContext(_options));
    }
}