using System.Net.Http.Json;
using System.Text.Json;
using FluentAssertions;
using foodmarket.IntegrationTests.Support;
using Xunit;

namespace foodmarket.IntegrationTests;

/// <summary>Интеграционные тесты модуля «Деньги» на реальном Postgres:
/// мультитенантность, оплата приёмок (частичная/полная/переплата), долг
/// поставщика, инвариант остатка счёта, запрет продажи без открытой смены,
/// расчёт ожидаемой наличности при закрытии смены.</summary>
[Collection(ApiCollection.Name)]
public class MoneyModuleTests
{
    private readonly ApiFactory _factory;
    public MoneyModuleTests(ApiFactory factory) => _factory = factory;

    private static string RandomBarcode()
        => string.Concat(Enumerable.Range(0, 13).Select(_ => Random.Shared.Next(0, 10)));

    // Cash=1, Safe=2, Bank=3, Acquiring=4 ; CashIn=3, CashOut=4
    private const int Cash = 1, Bank = 3;

    [Fact]
    public async Task Tenant_B_cannot_see_tenant_A_money_accounts()
    {
        var a = new ApiActor(_factory.CreateClient());
        await a.SignupAndLoginAsync($"money-a-{Guid.NewGuid():N}");
        var refsA = await a.LoadRefsAsync();
        var accA = await a.CreateMoneyAccountAsync("Касса А", Cash, refsA.CurrencyId, refsA.StoreId, 10_000m);

        var b = new ApiActor(_factory.CreateClient());
        await b.SignupAndLoginAsync($"money-b-{Guid.NewGuid():N}");

        var listB = await b.ListAsync("/api/money/accounts?pageSize=200");
        listB.Select(x => x.GetProperty("id").GetString()).Should().NotContain(accA,
            "орг Б не должна видеть счета орг А (query-filter по OrganizationId)");

        // Прямой GET чужого счёта — 404 (фильтр прячет как «нет такого»).
        using var direct = await b.Http.GetAsync($"/api/money/accounts/{accA}");
        ((int)direct.StatusCode).Should().Be(404);
    }

    [Fact]
    public async Task Account_balance_invariant_opening_plus_posted_movements()
    {
        var api = new ApiActor(_factory.CreateClient());
        await api.SignupAndLoginAsync($"bal-{Guid.NewGuid():N}");
        var refs = await api.LoadRefsAsync();
        var acc = await api.CreateMoneyAccountAsync("Сейф", 2, refs.CurrencyId, null, 100_000m);

        // CashIn 30 000 (проведён) + CashOut 12 000 (проведён) → остаток 118 000.
        await PostTxAsync(api, kind: 3, accountId: acc, amount: 30_000m, refs.CurrencyId);
        await PostTxAsync(api, kind: 4, accountId: acc, amount: 12_000m, refs.CurrencyId, needExpenseItem: true, api2: api);

        var balances = await api.GetJsonAsync("/api/money/reports/balances");
        var row = balances.GetProperty("accounts").EnumerateArray().First(x => x.GetProperty("accountId").GetString() == acc);
        row.GetProperty("currentBalance").GetDecimal().Should().Be(118_000m);
    }

    [Fact]
    public async Task Partial_then_full_payment_moves_supply_status_unpaid_partial_paid()
    {
        var api = new ApiActor(_factory.CreateClient());
        await api.SignupAndLoginAsync($"pay-{Guid.NewGuid():N}");
        var refs = await api.LoadRefsAsync();
        var supplier = await api.CreateCounterpartyAsync($"S-{Guid.NewGuid():N}");
        var product = await api.CreateProductAsync(refs, $"P-{Guid.NewGuid():N}", 150m, RandomBarcode());
        var cash = await api.CreateMoneyAccountAsync("Касса", Cash, refs.CurrencyId, refs.StoreId, 0m);

        var (supplyId, total) = await api.CreatePostedSupplyAsync(refs, supplier, product, qty: 10m, unitPrice: 100m);
        total.Should().Be(1000m);

        (await SupplyPaymentStatusAsync(api, supplyId)).Should().Be("unpaid");

        // Частичная оплата 400 из кассы (CashOut, привязка к приёмке).
        await PaySupplyAsync(api, cash, refs.CurrencyId, supplyId, 400m);
        (await SupplyPaymentStatusAsync(api, supplyId)).Should().Be("partial");

        // Добивка 600 → полностью оплачено.
        await PaySupplyAsync(api, cash, refs.CurrencyId, supplyId, 600m);
        var paid = await api.GetJsonAsync($"/api/purchases/supplies/{supplyId}");
        paid.GetProperty("paymentStatus").GetString().Should().Be("paid");
        paid.GetProperty("payedSum").GetDecimal().Should().Be(1000m);
    }

    [Fact]
    public async Task Overpaying_supply_is_rejected()
    {
        var api = new ApiActor(_factory.CreateClient());
        await api.SignupAndLoginAsync($"over-{Guid.NewGuid():N}");
        var refs = await api.LoadRefsAsync();
        var supplier = await api.CreateCounterpartyAsync($"S-{Guid.NewGuid():N}");
        var product = await api.CreateProductAsync(refs, $"P-{Guid.NewGuid():N}", 150m, RandomBarcode());
        var cash = await api.CreateMoneyAccountAsync("Касса", Cash, refs.CurrencyId, refs.StoreId, 0m);
        var (supplyId, _) = await api.CreatePostedSupplyAsync(refs, supplier, product, 5m, 100m); // total 500

        // Платёж на 800 с привязкой 800 → при проведении переплата → 409.
        var created = await api.Http.PostAsJsonAsync("/api/money/transactions", new
        {
            date = DateTime.UtcNow, kind = 4, accountId = cash, currencyId = refs.CurrencyId,
            amount = 800m, purpose = "overpay",
            links = new[] { new { supplyId, linkedSum = 800m } },
        });
        created.EnsureSuccessStatusCode();
        var txId = (await created.Content.ReadFromJsonAsync<JsonElement>()).GetProperty("id").GetString();
        using var post = await api.Http.PostAsJsonAsync($"/api/money/transactions/{txId}/post", new { });
        ((int)post.StatusCode).Should().Be(409, "переплата приёмки должна блокироваться");
    }

    [Fact]
    public async Task Supplier_debt_report_reflects_supplies_minus_payments()
    {
        var api = new ApiActor(_factory.CreateClient());
        await api.SignupAndLoginAsync($"debt-{Guid.NewGuid():N}");
        var refs = await api.LoadRefsAsync();
        var supplier = await api.CreateCounterpartyAsync($"Долговой-{Guid.NewGuid():N}");
        var product = await api.CreateProductAsync(refs, $"P-{Guid.NewGuid():N}", 150m, RandomBarcode());
        var cash = await api.CreateMoneyAccountAsync("Касса", Cash, refs.CurrencyId, refs.StoreId, 0m);
        var (supplyId, _) = await api.CreatePostedSupplyAsync(refs, supplier, product, 10m, 100m); // 1000
        await PaySupplyAsync(api, cash, refs.CurrencyId, supplyId, 300m);

        var report = await api.GetJsonAsync("/api/money/reports/supplier-debts?withDebtOnly=false");
        var row = report.GetProperty("rows").EnumerateArray().First(x => x.GetProperty("supplierId").GetString() == supplier);
        row.GetProperty("debt").GetDecimal().Should().Be(700m, "1000 приёмка − 300 оплачено");
    }

    [Fact]
    public async Task Sale_without_open_shift_is_rejected_then_allowed_after_open()
    {
        var api = new ApiActor(_factory.CreateClient());
        await api.SignupAndLoginAsync($"shift-{Guid.NewGuid():N}");
        var refs = await api.LoadRefsAsync();
        var supplier = await api.CreateCounterpartyAsync($"S-{Guid.NewGuid():N}");
        var product = await api.CreateProductAsync(refs, $"P-{Guid.NewGuid():N}", 500m, RandomBarcode());
        await api.CreatePostedSupplyAsync(refs, supplier, product, 10m, 100m); // даём остаток
        var retailPoint = await api.CreateRetailPointAsync(refs.StoreId, "Точка 1");
        var cash = await api.CreateMoneyAccountAsync("Касса точки", Cash, refs.CurrencyId, refs.StoreId, 0m);

        // Продажа на точке БЕЗ смены → 409 cash-shift-required.
        var saleId = await CreateCashSaleDraftAsync(api, refs, retailPoint, product, qty: 1m, price: 500m);
        using (var noShift = await api.Http.PostAsJsonAsync($"/api/sales/retail/{saleId}/post", new { }))
        {
            ((int)noShift.StatusCode).Should().Be(409);
            (await noShift.Content.ReadAsStringAsync()).Should().Contain("cash-shift-required");
        }

        // Открываем смену и повторяем — проходит.
        await OpenShiftAsync(api, retailPoint, cash, openingFloat: 0m);
        using var ok = await api.Http.PostAsJsonAsync($"/api/sales/retail/{saleId}/post", new { });
        ok.IsSuccessStatusCode.Should().BeTrue($"после открытия смены продажа должна провестись: {(int)ok.StatusCode} {await ok.Content.ReadAsStringAsync()}");
    }

    [Fact]
    public async Task Closing_shift_computes_expected_cash_and_difference()
    {
        var api = new ApiActor(_factory.CreateClient());
        await api.SignupAndLoginAsync($"close-{Guid.NewGuid():N}");
        var refs = await api.LoadRefsAsync();
        var supplier = await api.CreateCounterpartyAsync($"S-{Guid.NewGuid():N}");
        var product = await api.CreateProductAsync(refs, $"P-{Guid.NewGuid():N}", 500m, RandomBarcode());
        await api.CreatePostedSupplyAsync(refs, supplier, product, 10m, 100m);
        var retailPoint = await api.CreateRetailPointAsync(refs.StoreId, "Точка 2");
        var cash = await api.CreateMoneyAccountAsync("Касса точки", Cash, refs.CurrencyId, refs.StoreId, 0m);

        var shiftId = await OpenShiftAsync(api, retailPoint, cash, openingFloat: 10_000m);

        // Продажа 1 шт за 500 наличными.
        var saleId = await CreateCashSaleDraftAsync(api, refs, retailPoint, product, 1m, 500m);
        (await api.Http.PostAsJsonAsync($"/api/sales/retail/{saleId}/post", new { })).EnsureSuccessStatusCode();

        // Внесение 1 000 + выплата (инкассация) 2 000.
        (await api.Http.PostAsJsonAsync($"/api/money/shifts/{shiftId}/drawer", new { direction = 1, amount = 1_000m, reason = "Размен" })).EnsureSuccessStatusCode();
        (await api.Http.PostAsJsonAsync($"/api/money/shifts/{shiftId}/drawer", new { direction = 2, amount = 2_000m, reason = "Инкассация" })).EnsureSuccessStatusCode();

        // expected = 10 000 + 500 − 0 + 1 000 − 2 000 = 9 500. Факт 9 500 → diff 0.
        using var close = await api.Http.PostAsJsonAsync($"/api/money/shifts/{shiftId}/close", new { actualCash = 9_500m, notes = (string?)null });
        close.EnsureSuccessStatusCode();
        var body = await close.Content.ReadFromJsonAsync<JsonElement>();
        body.GetProperty("expectedCash").GetDecimal().Should().Be(9_500m);
        body.GetProperty("difference").GetDecimal().Should().Be(0m);
    }

    // ── helpers ─────────────────────────────────────────────────────────────
    private static async Task PostTxAsync(ApiActor api, int kind, string accountId, decimal amount, string currencyId,
        bool needExpenseItem = false, ApiActor? api2 = null)
    {
        string? expenseItemId = null;
        if (needExpenseItem)
        {
            var items = await api.ListAsync("/api/money/expense-items?pageSize=50");
            expenseItemId = items.First().GetProperty("id").GetString();
        }
        var created = await api.Http.PostAsJsonAsync("/api/money/transactions", new
        {
            date = DateTime.UtcNow, kind, accountId, currencyId, amount,
            expenseItemId, purpose = "test",
        });
        created.EnsureSuccessStatusCode();
        var txId = (await created.Content.ReadFromJsonAsync<JsonElement>()).GetProperty("id").GetString();
        (await api.Http.PostAsJsonAsync($"/api/money/transactions/{txId}/post", new { })).EnsureSuccessStatusCode();
    }

    private static async Task PaySupplyAsync(ApiActor api, string accountId, string currencyId, string supplyId, decimal amount)
    {
        var created = await api.Http.PostAsJsonAsync("/api/money/transactions", new
        {
            date = DateTime.UtcNow, kind = 4, accountId, currencyId, amount, purpose = "Оплата приёмки",
            links = new[] { new { supplyId, linkedSum = amount } },
        });
        created.EnsureSuccessStatusCode();
        var txId = (await created.Content.ReadFromJsonAsync<JsonElement>()).GetProperty("id").GetString();
        (await api.Http.PostAsJsonAsync($"/api/money/transactions/{txId}/post", new { })).EnsureSuccessStatusCode();
    }

    private static async Task<string> SupplyPaymentStatusAsync(ApiActor api, string supplyId)
        => (await api.GetJsonAsync($"/api/purchases/supplies/{supplyId}")).GetProperty("paymentStatus").GetString()!;

    private static async Task<string> CreateCashSaleDraftAsync(ApiActor api, ApiActor.Refs refs, string retailPointId,
        string productId, decimal qty, decimal price)
    {
        var draft = await api.Http.PostAsJsonAsync("/api/sales/retail", new
        {
            date = DateTime.UtcNow, storeId = refs.StoreId, retailPointId,
            customerId = (string?)null, currencyId = refs.CurrencyId,
            payment = 0, paidCash = qty * price, paidCard = 0m, notes = "shift-test",
            lines = new[] { new { productId, quantity = qty, unitPrice = price, discount = 0m, vatPercent = 0m } },
        });
        draft.EnsureSuccessStatusCode();
        return (await draft.Content.ReadFromJsonAsync<JsonElement>()).GetProperty("id").GetString()!;
    }

    private static async Task<string> OpenShiftAsync(ApiActor api, string retailPointId, string cashAccountId, decimal openingFloat)
    {
        var resp = await api.Http.PostAsJsonAsync("/api/money/shifts/open", new
        {
            retailPointId, cashAccountId, acquiringAccountId = (string?)null, openingFloat,
        });
        var body = await resp.Content.ReadAsStringAsync();
        if (!resp.IsSuccessStatusCode) throw new InvalidOperationException($"OpenShift failed {(int)resp.StatusCode}: {body}");
        return JsonDocument.Parse(body).RootElement.GetProperty("id").GetString()!;
    }
}