using System.Net;
using System.Net.Http.Json;
using System.Text.Json;
using GerbilManagerWebAPI.Import;
using GerbilManagerWebAPI.Models;
using Microsoft.EntityFrameworkCore;
using Microsoft.Extensions.Configuration;

namespace GerbilManager.Tests;

/// <summary>
/// ABGABE-STATUS (Reservierungs-/Abgabe-Status): the pre-handover pipeline
/// verfügbar → reserviert → abgegeben.
///  - Full CRUD round-trip via /reservations.
///  - GET ?gerbilId= filters to one animal.
///  - Invalid status falls back to "verfuegbar".
///  - CRITICAL: rows survive the import re-ingest wipe (loose, FK-free GerbilId/ReservedForContactId).
/// </summary>
public class SaleReservationEndpointTests : IClassFixture<ApiFactory>
{
    private readonly ApiFactory _factory;
    public SaleReservationEndpointTests(ApiFactory factory) => _factory = factory;

    [Fact]
    public async Task Reservation_crud_lifecycle_create_reserve_handover_delete()
    {
        var client = _factory.CreateClient();
        var gerbilId = Guid.NewGuid();
        var contactId = Guid.NewGuid();

        // Create -> defaults to verfuegbar.
        var create = await client.PostAsJsonAsync("/reservations", new
        {
            gerbilId,
            gerbilName = "Pippa",
        });
        Assert.Equal(HttpStatusCode.Created, create.StatusCode);
        var created = JsonDocument.Parse(await create.Content.ReadAsStringAsync()).RootElement;
        var id = created.GetProperty("id").GetString();
        Assert.False(string.IsNullOrEmpty(id));
        Assert.Equal("verfuegbar", created.GetProperty("status").GetString());
        Assert.Equal(gerbilId.ToString(), created.GetProperty("gerbilId").GetString());
        Assert.Equal("Pippa", created.GetProperty("gerbilName").GetString());

        // List contains it.
        var listed = JsonDocument.Parse(await client.GetStringAsync("/reservations")).RootElement;
        Assert.Contains(listed.EnumerateArray(), r => r.GetProperty("id").GetString() == id);

        // Filter by gerbilId returns exactly this row.
        var byGerbil = JsonDocument.Parse(await client.GetStringAsync($"/reservations?gerbilId={gerbilId}")).RootElement;
        Assert.All(byGerbil.EnumerateArray(), r => Assert.Equal(gerbilId.ToString(), r.GetProperty("gerbilId").GetString()));
        Assert.Contains(byGerbil.EnumerateArray(), r => r.GetProperty("id").GetString() == id);

        // PUT -> reserve for a contact with an appointment + price.
        var reserve = await client.PutAsJsonAsync($"/reservations/{id}", new
        {
            status = "reserviert",
            reservedForContactId = contactId,
            contactName = "Familie Huber",
            appointmentDate = "2026-07-01T10:00:00Z",
            price = 25.50m,
            note = "Käfig wird mitgebracht.",
        });
        Assert.Equal(HttpStatusCode.OK, reserve.StatusCode);
        var reserved = JsonDocument.Parse(await reserve.Content.ReadAsStringAsync()).RootElement;
        Assert.Equal("reserviert", reserved.GetProperty("status").GetString());
        Assert.Equal(contactId.ToString(), reserved.GetProperty("reservedForContactId").GetString());
        Assert.Equal("Familie Huber", reserved.GetProperty("contactName").GetString());
        Assert.Equal(25.50m, reserved.GetProperty("price").GetDecimal());

        // PUT -> hand over.
        var handover = await client.PutAsJsonAsync($"/reservations/{id}", new
        {
            status = "abgegeben",
            reservedForContactId = contactId,
            handedOverDate = "2026-07-01T10:30:00Z",
        });
        Assert.Equal(HttpStatusCode.OK, handover.StatusCode);
        var handed = JsonDocument.Parse(await handover.Content.ReadAsStringAsync()).RootElement;
        Assert.Equal("abgegeben", handed.GetProperty("status").GetString());
        Assert.NotEqual(JsonValueKind.Null, handed.GetProperty("handedOverDate").ValueKind);

        // Delete -> 204, then 404.
        Assert.Equal(HttpStatusCode.NoContent, (await client.DeleteAsync($"/reservations/{id}")).StatusCode);
        Assert.Equal(HttpStatusCode.NotFound, (await client.DeleteAsync($"/reservations/{id}")).StatusCode);
        Assert.Equal(HttpStatusCode.NotFound, (await client.PutAsJsonAsync($"/reservations/{id}", new { status = "verfuegbar" })).StatusCode);
    }

    [Fact]
    public async Task Post_with_unknown_status_falls_back_to_verfuegbar()
    {
        var client = _factory.CreateClient();
        var create = await client.PostAsJsonAsync("/reservations", new { gerbilId = Guid.NewGuid(), status = "bananen" });
        Assert.Equal(HttpStatusCode.Created, create.StatusCode);
        var dto = JsonDocument.Parse(await create.Content.ReadAsStringAsync()).RootElement;
        Assert.Equal("verfuegbar", dto.GetProperty("status").GetString());
    }

    [Fact]
    public async Task Post_without_gerbilId_is_rejected()
    {
        var client = _factory.CreateClient();
        var create = await client.PostAsJsonAsync("/reservations", new { gerbilId = Guid.Empty, status = "reserviert" });
        Assert.Equal(HttpStatusCode.BadRequest, create.StatusCode);
    }

    [Fact]
    public async Task Reservation_survives_ingest_wipe()
    {
        // Fresh in-memory DB seeded with a resolved import file (mirrors IngestResolvedServiceTests).
        var dir = Path.Combine(Path.GetTempPath(), "reservation-ingest-" + Guid.NewGuid().ToString("N"));
        Directory.CreateDirectory(dir);
        try
        {
            var contactId = Guid.NewGuid();
            var fatherId = Guid.NewGuid();
            var motherId = Guid.NewGuid();
            var litterId = Guid.NewGuid();

            var data = new
            {
                Contacts = new[]
                {
                    new { Id = contactId, Name = "Test Breeder", Email = "t@e.de", Phone = "", Address = "", Notes = (string?)null, IsBreeder = true, IsReceiver = false, NameSuffix = (string?)null, Provenance = (string?)null }
                },
                Litters = new[]
                {
                    new { Id = litterId, Name = "Wurf A", Date = "2026-01-01", TotalBorn = 5, DeathsWithin8Weeks = 0, FatherId = fatherId, MotherId = motherId, ExpectedGoHomeDate = (string?)null, Notes = "", PairingCode = "PC01", ExternalRef = "ext-litter-1", LitterLetter = "A" }
                },
                Gerbils = new[]
                {
                    Animal(fatherId, "Papa", "male", contactId),
                    Animal(motherId, "Mama", "female", contactId),
                },
                GerbilPhotos = Array.Empty<object>(),
            };
            File.WriteAllText(Path.Combine(dir, "resolved_import.json"), JsonSerializer.Serialize(data));

            var opts = new DbContextOptionsBuilder<ApplicationContext>()
                .UseInMemoryDatabase("reservation-ingest-" + Guid.NewGuid().ToString("N"))
                .Options;
            using var db = new ApplicationContext(opts);
            db.Database.EnsureCreated();

            // A reservation referencing the gerbil + contact that the wipe will delete.
            var resId = Guid.NewGuid();
            db.SaleReservations.Add(new SaleReservation
            {
                Id = resId,
                GerbilId = fatherId,
                GerbilName = "Papa",
                Status = "reserviert",
                ReservedForContactId = contactId,
                ContactName = "Test Breeder",
                AppointmentDate = new DateTime(2026, 7, 1, 10, 0, 0, DateTimeKind.Utc),
                Price = 30m,
                Note = "Abholung am Wochenende.",
                CreatedAt = DateTimeOffset.UtcNow,
                UpdatedAt = DateTimeOffset.UtcNow,
            });
            await db.SaveChangesAsync();

            var config = new ConfigurationBuilder()
                .AddInMemoryCollection(new Dictionary<string, string?> { { "Import:SourcePath", dir } })
                .Build();

            // Run the ingest wipe + reload.
            var result = await new IngestResolvedService(db, config, null!).RunAsync();
            Assert.Contains("Ingestion successful!", result);

            // Gerbils/contacts were wiped & re-created, but the reservation is untouched.
            var survivor = await db.SaleReservations.SingleAsync(r => r.Id == resId);
            Assert.Equal(fatherId, survivor.GerbilId);          // loose id preserved
            Assert.Equal(contactId, survivor.ReservedForContactId);
            Assert.Equal("Papa", survivor.GerbilName);
            Assert.Equal("Test Breeder", survivor.ContactName);
            Assert.Equal("reserviert", survivor.Status);
            Assert.Equal(30m, survivor.Price);
            Assert.Equal(1, await db.SaleReservations.CountAsync());
        }
        finally
        {
            try { Directory.Delete(dir, recursive: true); } catch { /* best effort */ }
        }
    }

    private static object Animal(Guid id, string name, string gender, Guid contactId) => new
    {
        Id = id,
        Name = name,
        Gender = gender,
        Status = "Breeding",
        LitterId = (Guid?)null,
        OriginContactId = contactId,
        ReceiverContactId = (Guid?)null,
        EnclosureId = (Guid?)null,
        ColorVarietyId = new Guid("00000000-0000-0000-0000-000000000006"),
        DateOfBirth = "2025-01-01",
        DateOfDeath = (string?)null,
        CauseOfDeath = (string?)null,
        GoHomeDate = (string?)null,
        Genotype = "aa CC DD EE GG PP spsp rere",
        Notes = "",
        ImportSource = "docx-export",
        ExternalRef = "ext-" + name,
        RawImportData = "{}",
        OriginBreeder = "Test Zucht",
        NameSearch = name.ToLowerInvariant(),
        CharacterTraits = Array.Empty<string>(),
        CharacterNote = (string?)null,
        IsDeaf = false,
        IsResident = true,
    };
}