using System.Net;
using System.Net.Http.Headers;
using System.Net.Http.Json;
using System.Text.Json;
using Azaion.Missions.E2E.Fixtures;
using Azaion.Missions.E2E.Helpers;
using Xunit;

namespace Azaion.Missions.E2E.Tests.Vehicles;

/// <summary>
/// FT-P-01..06 — vehicle happy-path scenarios from
/// <c>_docs/02_document/tests/blackbox-tests.md § Positive</c>.
/// Traces: AC-1.1 / AC-1.2 / AC-1.4 / AC-1.5 / AC-1.6 / AC-1.10.
/// </summary>
[Collection("Vehicles")]
[Trait("Category", "Blackbox")]
[Trait("db_access", "seed-or-assert-only")]
public sealed class PositiveTests : TestBase, IClassFixture<DbResetFixture>
{
    [Fact]
    [Trait("Traces", "AC-1.1")]
    [Trait("max_ms", "5000")]
    public async Task FT_P_01_create_non_default_returns_201_with_pascal_case_body()
    {
        // Arrange
        DbResetFixture.ResetDatabase(TestEnvironment.DbSideChannel);
        var token = await Tokens.MintDefaultAsync();
        var request = new
        {
            Type = 0,
            Model = "Bayraktar",
            Name = "BR-01",
            FuelType = 1,
            BatteryCapacity = 0,
            EngineConsumption = 5,
            EngineConsumptionIdle = 1,
            IsDefault = false
        };

        // Act
        using var http = new HttpRequestMessage(HttpMethod.Post, "/vehicles")
        {
            Content = JsonContent.Create(request)
        };
        http.Headers.Authorization = new AuthenticationHeaderValue("Bearer", token.Jwt);
        using var response = await Missions.SendAsync(http);

        // Assert
        await HttpAssertions.AssertStatusAsync(response, HttpStatusCode.Created);

        var raw = await response.Content.ReadAsStringAsync();
        using var doc = JsonDocument.Parse(raw);
        var root = doc.RootElement;
        // Pin PascalCase contract — a future global camelCase migration must
        // break this test (results_report.md row 1.1 + AC-8.1).
        Assert.True(root.TryGetProperty("Id", out var idEl), $"body missing PascalCase 'Id': {raw}");
        Assert.True(root.TryGetProperty("Name", out var nameEl));
        Assert.True(root.TryGetProperty("IsDefault", out var defEl));
        Assert.False(root.TryGetProperty("id", out _), "body unexpectedly camelCase");

        var id = idEl.GetGuid();
        Assert.Equal("BR-01", nameEl.GetString());
        Assert.False(defEl.GetBoolean());

        var count = DbAssertions.ScalarCount(
            "SELECT COUNT(*) FROM vehicles WHERE id = @id",
            ("id", id));
        Assert.Equal(1, count);
    }

    [Fact]
    [Trait("Traces", "AC-1.2")]
    [Trait("max_ms", "5000")]
    public async Task FT_P_02_create_default_demotes_prior_default()
    {
        // Arrange
        DbResetFixture.ResetDatabase(TestEnvironment.DbSideChannel);
        Seeds.Apply(Seeds.OneDefaultVehicle.Sql);
        var priorDefaultId = Seeds.OneDefaultVehicle.Id;
        var token = await Tokens.MintDefaultAsync();
        var request = new
        {
            Type = 0,
            Model = "Bayraktar",
            Name = "BR-02-default",
            FuelType = 1,
            BatteryCapacity = 0,
            EngineConsumption = 5,
            EngineConsumptionIdle = 1,
            IsDefault = true
        };

        // Act
        using var http = new HttpRequestMessage(HttpMethod.Post, "/vehicles")
        {
            Content = JsonContent.Create(request)
        };
        http.Headers.Authorization = new AuthenticationHeaderValue("Bearer", token.Jwt);
        using var response = await Missions.SendAsync(http);

        // Assert
        await HttpAssertions.AssertStatusAsync(response, HttpStatusCode.Created);

        var newVehicle = await response.Content.ReadFromJsonAsync<VehicleDto>()
            ?? throw new InvalidOperationException("response body deserialized to null");
        Assert.True(newVehicle.IsDefault, "newly-created vehicle must be default");

        var totalDefaults = DbAssertions.ScalarCount(
            "SELECT COUNT(*) FROM vehicles WHERE is_default = TRUE");
        Assert.Equal(1, totalDefaults);

        var priorIsDefault = DbAssertions.ScalarCount(
            "SELECT COUNT(*) FROM vehicles WHERE id = @id AND is_default = TRUE",
            ("id", priorDefaultId));
        Assert.Equal(0, priorIsDefault);

        var newIsDefault = DbAssertions.ScalarCount(
            "SELECT COUNT(*) FROM vehicles WHERE id = @id AND is_default = TRUE",
            ("id", newVehicle.Id));
        Assert.Equal(1, newIsDefault);
    }

    [Fact]
    [Trait("Traces", "AC-1.4")]
    [Trait("max_ms", "5000")]
    [Trait("carry_forward", "setDefault-route-method-return")]
    public async Task FT_P_03_setDefault_promotes_existing_vehicle()
    {
        // CARRY-FORWARD: the canonical task spec + results_report.md row 1.4 say
        // "POST /vehicles/{id}/setDefault" returning "200 with body {Vehicle}",
        // but the actual code (Controllers/VehiclesController.cs:48) is
        // "[HttpPatch("{id:guid}/default")]" returning "204 NoContent" (no body).
        // Per /autodev batch 2 user choice, this test asserts the CODE shape.
        // When the spec/code divergence is closed, flip method+status here.

        // Arrange
        DbResetFixture.ResetDatabase(TestEnvironment.DbSideChannel);
        Seeds.Apply(Seeds.OneDefaultVehicle.Sql);
        var priorDefaultId = Seeds.OneDefaultVehicle.Id;

        var p2Id = Guid.NewGuid();
        Seeds.Apply($"""
            INSERT INTO vehicles
                (id, type, model, name, fuel_type, battery_capacity,
                 engine_consumption, engine_consumption_idle, is_default)
            VALUES
                ('{p2Id}', 0, 'Bayraktar', 'BR-promote', 1, 0, 5, 1, false);
            """);

        var token = await Tokens.MintDefaultAsync();

        // Act
        using var http = new HttpRequestMessage(HttpMethod.Patch, $"/vehicles/{p2Id}/default")
        {
            Content = JsonContent.Create(new { IsDefault = true })
        };
        http.Headers.Authorization = new AuthenticationHeaderValue("Bearer", token.Jwt);
        using var response = await Missions.SendAsync(http);

        // Assert
        await HttpAssertions.AssertStatusAsync(response, HttpStatusCode.NoContent);

        var promoted = DbAssertions.ScalarCount(
            "SELECT COUNT(*) FROM vehicles WHERE id = @id AND is_default = TRUE",
            ("id", p2Id));
        Assert.Equal(1, promoted);

        var demoted = DbAssertions.ScalarCount(
            "SELECT COUNT(*) FROM vehicles WHERE id = @id AND is_default = TRUE",
            ("id", priorDefaultId));
        Assert.Equal(0, demoted);

        DbAssertions.AssertExactlyOneDefaultVehicle();
    }

    [Fact]
    [Trait("Traces", "AC-1.5")]
    [Trait("max_ms", "2000")]
    public async Task FT_P_04_list_is_unpaginated_array_ordered_by_name()
    {
        // Arrange
        DbResetFixture.ResetDatabase(TestEnvironment.DbSideChannel);
        Seeds.Apply(Seeds.Three_BR01_BR02_MQ9.Sql);
        var token = await Tokens.MintDefaultAsync();

        // Act
        using var http = new HttpRequestMessage(HttpMethod.Get, "/vehicles");
        http.Headers.Authorization = new AuthenticationHeaderValue("Bearer", token.Jwt);
        using var response = await Missions.SendAsync(http);

        // Assert
        await HttpAssertions.AssertStatusAsync(response, HttpStatusCode.OK);

        var raw = await response.Content.ReadAsStringAsync();
        using var doc = JsonDocument.Parse(raw);
        Assert.Equal(JsonValueKind.Array, doc.RootElement.ValueKind);

        var vehicles = JsonSerializer.Deserialize<List<VehicleDto>>(raw)
            ?? throw new InvalidOperationException($"could not deserialize array: {raw}");
        Assert.Equal(3, vehicles.Count);
        Assert.Equal(new[] { "BR-01", "BR-02", "MQ-9" },
            vehicles.Select(v => v.Name).ToArray());
    }

    [Fact]
    [Trait("Traces", "AC-1.6")]
    [Trait("max_ms", "2000")]
    public async Task FT_P_05_filter_is_case_insensitive_for_both_casings()
    {
        // Arrange
        DbResetFixture.ResetDatabase(TestEnvironment.DbSideChannel);
        Seeds.Apply(Seeds.Three_BR01_BR02_MQ9.Sql);
        var token = await Tokens.MintDefaultAsync();

        async Task<List<VehicleDto>> FetchAsync(string query)
        {
            using var http = new HttpRequestMessage(HttpMethod.Get, "/vehicles?" + query);
            http.Headers.Authorization = new AuthenticationHeaderValue("Bearer", token.Jwt);
            using var resp = await Missions.SendAsync(http);
            await HttpAssertions.AssertStatusAsync(resp, HttpStatusCode.OK);
            return await resp.Content.ReadFromJsonAsync<List<VehicleDto>>()                   ?? throw new InvalidOperationException("null body for /vehicles filter");
        }

        // Act
        var upper = await FetchAsync("name=BR&isDefault=true");
        var lower = await FetchAsync("name=br&isDefault=true");

        // Assert
        Assert.Single(upper);
        Assert.Equal("BR-01", upper[0].Name);
        Assert.Single(lower);
        Assert.Equal("BR-01", lower[0].Name);
    }

    [Fact]
    [Trait("Traces", "AC-1.10")]
    [Trait("max_ms", "2000")]
    public async Task FT_P_06_delete_with_no_references_returns_204_and_row_is_gone()
    {
        // Arrange
        DbResetFixture.ResetDatabase(TestEnvironment.DbSideChannel);
        Seeds.Apply(Seeds.OneDefaultVehicle.Sql);
        var id = Seeds.OneDefaultVehicle.Id;
        var token = await Tokens.MintDefaultAsync();

        // Act
        using var http = new HttpRequestMessage(HttpMethod.Delete, $"/vehicles/{id}");
        http.Headers.Authorization = new AuthenticationHeaderValue("Bearer", token.Jwt);
        using var response = await Missions.SendAsync(http);

        // Assert
        await HttpAssertions.AssertStatusAsync(response, HttpStatusCode.NoContent);
        var bodyLength = (await response.Content.ReadAsByteArrayAsync()).Length;
        Assert.Equal(0, bodyLength);

        var remaining = DbAssertions.ScalarCount(
            "SELECT COUNT(*) FROM vehicles WHERE id = @id",
            ("id", id));
        Assert.Equal(0, remaining);
    }
}