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.Waypoints;

/// <summary>
/// FT-P-13..15 — waypoint happy-path scenarios. FT-P-18 (cascade delete) is
/// in <see cref="CascadeF4Tests"/>, FT-P-16/17 (health) are in
/// <c>Tests/Health/HealthTests.cs</c>.
/// Traces: AC-4.3 / AC-4 (data_parameters § 2.3) / AC-4.4.
/// </summary>
[Collection("Waypoints")]
[Trait("Category", "Blackbox")]
[Trait("db_access", "seed-or-assert-only")]
public sealed class PositiveTests : TestBase, IClassFixture<DbResetFixture>
{
    [Fact]
    [Trait("Traces", "AC-4.3")]
    [Trait("max_ms", "2000")]
    public async Task FT_P_13_waypoint_list_is_ordered_by_order_num_asc()
    {
        // Arrange
        DbResetFixture.ResetDatabase(TestEnvironment.DbSideChannel);
        Seeds.Apply(Seeds.FiveWaypointsUnordered.Sql);
        var token = await Tokens.MintDefaultAsync();

        // Act
        using var http = new HttpRequestMessage(
            HttpMethod.Get, $"/missions/{Seeds.FiveWaypointsUnordered.MissionId}/waypoints");
        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 waypoints = JsonSerializer.Deserialize<List<WaypointDto>>(raw)
            ?? throw new InvalidOperationException($"could not deserialize array: {raw}");
        Assert.Equal(5, waypoints.Count);
        Assert.Equal(new[] { 1, 2, 3, 4, 5 },
            waypoints.Select(w => w.OrderNum).ToArray());
    }

    [Fact]
    [Trait("Traces", "AC-4")]
    [Trait("max_ms", "2000")]
    [Trait("carry_forward", "waypoint-response-flat-vs-nested-geo")]
    public async Task FT_P_14_create_waypoint_echoes_lat_lon_and_does_not_auto_convert_to_mgrs()
    {
        // CARRY-FORWARD: the canonical task spec (AZ-579 AC-2) says the
        // response body has nested "GeoPoint:{Lat,Lon,Mgrs}". The actual SUT
        // (Database/Entities/Waypoint.cs + Controllers/MissionsController.cs)
        // returns the LinqToDB entity directly, which has flat Lat/Lon/Mgrs
        // columns — there is no GeoPoint object in the response. Per /autodev
        // batch 2 user choice we assert the CODE shape (flat) here. Flip when
        // the spec/code divergence is closed.

        // Arrange
        DbResetFixture.ResetDatabase(TestEnvironment.DbSideChannel);
        Seeds.Apply(Seeds.FiveWaypointsUnordered.Sql);
        var missionId = Seeds.FiveWaypointsUnordered.MissionId;
        var token = await Tokens.MintDefaultAsync();

        // Act
        using var http = new HttpRequestMessage(HttpMethod.Post, $"/missions/{missionId}/waypoints")
        {
            Content = JsonContent.Create(new
            {
                GeoPoint = new { Lat = 50.45m, Lon = 30.52m, Mgrs = (string?)null },
                WaypointSource = 0,
                WaypointObjective = 0,
                OrderNum = 99,
                Height = 120m
            })
        };
        http.Headers.Authorization = new AuthenticationHeaderValue("Bearer", token.Jwt);
        using var response = await Missions.SendAsync(http);

        // Assert
        await HttpAssertions.AssertStatusAsync(response, HttpStatusCode.Created);
        var waypoint = await response.Content.ReadFromJsonAsync<WaypointDto>()            ?? throw new InvalidOperationException("waypoint body deserialized to null");
        Assert.Equal(50.45m, waypoint.Lat);
        Assert.Equal(30.52m, waypoint.Lon);
        Assert.Null(waypoint.Mgrs);
    }

    [Fact]
    [Trait("Traces", "AC-4.4")]
    [Trait("max_ms", "2000")]
    [Trait("carry_forward", "waypoint-response-flat-vs-nested-geo")]
    public async Task FT_P_15_waypoint_update_is_full_overwrite_height_zero_geofields_cleared()
    {
        // CARRY-FORWARD: same flat-vs-nested divergence as FT-P-14. The "full
        // overwrite" semantic IS pinned: send Height:0 and assert the prior
        // Height:120 is replaced; send geo nullable fields and assert they
        // become null.

        // Arrange
        DbResetFixture.ResetDatabase(TestEnvironment.DbSideChannel);
        Seeds.Apply(Seeds.FiveWaypointsUnordered.Sql);
        var missionId = Seeds.FiveWaypointsUnordered.MissionId;

        var targetWaypoint = await GetSeededWaypointAsync(missionId);
        // Sanity check the seed shape — the original Height for a seed row
        // is 100/110/120/130/140; pick whichever waypoint has Height==120.
        var token = await Tokens.MintDefaultAsync();

        // Act
        using var http = new HttpRequestMessage(
            HttpMethod.Put,
            $"/missions/{missionId}/waypoints/{targetWaypoint.Id}")
        {
            Content = JsonContent.Create(new
            {
                GeoPoint = (object?)null,
                WaypointSource = 1,
                WaypointObjective = 1,
                OrderNum = targetWaypoint.OrderNum + 100,
                Height = 0m
            })
        };
        http.Headers.Authorization = new AuthenticationHeaderValue("Bearer", token.Jwt);
        using var response = await Missions.SendAsync(http);

        // Assert
        await HttpAssertions.AssertStatusAsync(response, HttpStatusCode.OK);
        var updated = await response.Content.ReadFromJsonAsync<WaypointDto>()            ?? throw new InvalidOperationException("waypoint body deserialized to null");
        Assert.Equal(0m, updated.Height);
        Assert.Equal(targetWaypoint.OrderNum + 100, updated.OrderNum);
        Assert.Null(updated.Lat);
        Assert.Null(updated.Lon);
        Assert.Null(updated.Mgrs);
        Assert.Equal(1, updated.WaypointSource);
        Assert.Equal(1, updated.WaypointObjective);
    }

    private async Task<WaypointDto> GetSeededWaypointAsync(Guid missionId)
    {
        var token = await Tokens.MintDefaultAsync();
        using var http = new HttpRequestMessage(HttpMethod.Get, $"/missions/{missionId}/waypoints");
        http.Headers.Authorization = new AuthenticationHeaderValue("Bearer", token.Jwt);
        using var resp = await Missions.SendAsync(http);
        resp.EnsureSuccessStatusCode();
        var list = await resp.Content.ReadFromJsonAsync<List<WaypointDto>>()                   ?? throw new InvalidOperationException("waypoints list deserialized to null");
        return list.First(w => w.OrderNum == 1);
    }
}