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

namespace foodmarket.IntegrationTests;

[Collection(ApiCollection.Name)]
public class NegativeStockTests
{
    private readonly ApiFactory _factory;
    public NegativeStockTests(ApiFactory factory) => _factory = factory;

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

    private async Task SeedStockAsync(ApiActor api, ApiActor.Refs refs, string productId, decimal qty)
    {
        var enter = await api.Http.PostAsJsonAsync("/api/inventory/enters", new
        {
            date = DateTime.UtcNow, storeId = refs.StoreId, currencyId = refs.CurrencyId,
            notes = "seed", lines = new[] { new { productId = productId, quantity = qty, unitCost = 50m } },
        });
        enter.EnsureSuccessStatusCode();
        var eid = (await enter.Content.ReadFromJsonAsync<JsonElement>()).GetProperty("id").GetString();
        (await api.Http.PostAsJsonAsync($"/api/inventory/enters/{eid}/post", new { })).EnsureSuccessStatusCode();
    }

    [Fact]
    public async Task Loss_into_negative_is_allowed_creates_alert_recount_and_resolves_on_restock()
    {
        var api = new ApiActor(_factory.CreateClient());
        await api.SignupAndLoginAsync($"neg-{Guid.NewGuid():N}");
        var refs = await api.LoadRefsAsync();
        var p = await api.CreateProductAsync(refs, $"P-{Guid.NewGuid():N}", 100m, RandomBarcode());

        // 5 шт на складе, минусов нет.
        await SeedStockAsync(api, refs, p, 5m);
        (await api.StockOfAsync(refs.StoreId, p)).Should().Be(5m);
        var c0 = await api.GetJsonAsync("/api/negative-stock/count");
        c0.GetProperty("total").GetInt32().Should().Be(0);

        // Списание 8 → остаток −3. Списание в минус РАЗРЕШЕНО (решение владельца).
        var loss = await api.Http.PostAsJsonAsync("/api/inventory/losses", new
        {
            date = DateTime.UtcNow, storeId = refs.StoreId, currencyId = refs.CurrencyId,
            reason = 0, notes = "тест минус",
            lines = new[] { new { productId = p, quantity = 8m, unitCost = 50m } },
        });
        loss.EnsureSuccessStatusCode();
        var lid = (await loss.Content.ReadFromJsonAsync<JsonElement>()).GetProperty("id").GetString();
        using var lpost = await api.Http.PostAsJsonAsync($"/api/inventory/losses/{lid}/post", new { });
        lpost.IsSuccessStatusCode.Should().BeTrue($"списание в минус разрешено: {(int)lpost.StatusCode} {await lpost.Content.ReadAsStringAsync()}");
        (await api.StockOfAsync(refs.StoreId, p)).Should().Be(-3m);

        // Предупреждение создано.
        var c1 = await api.GetJsonAsync("/api/negative-stock/count");
        c1.GetProperty("total").GetInt32().Should().Be(1);
        var alerts = await api.ListAsync("/api/negative-stock");
        alerts.Should().ContainSingle();
        alerts[0].GetProperty("quantity").GetDecimal().Should().Be(-3m);
        alerts[0].GetProperty("productId").GetString().Should().Be(p);
        alerts[0].GetProperty("causeDocType").GetString().Should().Be("loss");

        // «Пересчитать эти товары» → черновик инвентаризации с этим товаром.
        var rc = await api.Http.PostAsJsonAsync("/api/negative-stock/recount", new { storeId = refs.StoreId });
        rc.EnsureSuccessStatusCode();
        var rcj = await rc.Content.ReadFromJsonAsync<JsonElement>();
        rcj.GetProperty("lines").GetInt32().Should().Be(1);
        var invId = rcj.GetProperty("inventoryId").GetString();
        var inv = await api.GetJsonAsync($"/api/inventory/inventories/{invId}");
        inv.GetProperty("lines").EnumerateArray()
            .Should().ContainSingle(l => l.GetProperty("productId").GetString() == p);

        // Довоз 3 → остаток 0 → предупреждение закрылось автоматически.
        await SeedStockAsync(api, refs, p, 3m);
        (await api.StockOfAsync(refs.StoreId, p)).Should().Be(0m);
        var c2 = await api.GetJsonAsync("/api/negative-stock/count");
        c2.GetProperty("total").GetInt32().Should().Be(0);
        (await api.ListAsync("/api/negative-stock")).Should().BeEmpty("минус закрыт — алерт resolved");
    }

    [Fact]
    public async Task Negative_stock_report_filter_returns_only_negatives()
    {
        var api = new ApiActor(_factory.CreateClient());
        await api.SignupAndLoginAsync($"neg-rep-{Guid.NewGuid():N}");
        var refs = await api.LoadRefsAsync();
        var p = await api.CreateProductAsync(refs, $"P-{Guid.NewGuid():N}", 100m, RandomBarcode());

        await SeedStockAsync(api, refs, p, 2m);
        var loss = await api.Http.PostAsJsonAsync("/api/inventory/losses", new
        {
            date = DateTime.UtcNow, storeId = refs.StoreId, currencyId = refs.CurrencyId,
            reason = 0, notes = "minus", lines = new[] { new { productId = p, quantity = 5m, unitCost = 50m } },
        });
        loss.EnsureSuccessStatusCode();
        var lid = (await loss.Content.ReadFromJsonAsync<JsonElement>()).GetProperty("id").GetString();
        (await api.Http.PostAsJsonAsync($"/api/inventory/losses/{lid}/post", new { })).EnsureSuccessStatusCode();

        var neg = await api.GetJsonAsync("/api/inventory/stock?negativeOnly=true&pageSize=200");
        var items = neg.GetProperty("items").EnumerateArray().ToList();
        items.Should().NotBeEmpty();
        items.Should().OnlyContain(x => x.GetProperty("quantity").GetDecimal() < 0);
    }
}