using System.IdentityModel.Tokens.Jwt;
using System.Net;
using System.Net.Http.Headers;
using System.Net.Http.Json;
using System.Text.Json;
using Azaion.E2E.Helpers;
using FluentAssertions;
using Xunit;

namespace Azaion.E2E.Tests;

/// <summary>
/// AZ-533 — mission-token issuance for offline UAV operations.
/// </summary>
public class MissionTokenTests : IClassFixture<TestFixture>
{
    private readonly TestFixture _fixture;

    public MissionTokenTests(TestFixture fixture) => _fixture = fixture;

    private async Task<(string Email, string Password)> SeedUser(string suffix, int role)
    {
        var email    = $"mission-{suffix}-{Guid.NewGuid():N}@e2e.local";
        var password = "Mission1234ABC";
        using var admin = _fixture.CreateAuthenticatedClient(_fixture.AdminToken);
        using var resp = await admin.PostAsync("/users", new { email, password, role });
        resp.StatusCode.Should().Be(HttpStatusCode.OK);
        return (email, password);
    }

    private async Task CleanupUser(string email)
    {
        await _fixture.Db.DeleteSessionsFor(email);
        await _fixture.Db.DeleteAuditEventsFor(email);
        await _fixture.Db.DeleteUser(email);
    }

    private async Task<Guid> GetUserId(string email)
    {
        // Trick: the access-token sub claim equals the user id; quickest to fetch
        // without adding a /me endpoint just for tests.
        var (e, p) = (email, "Mission1234ABC");
        using var c = _fixture.CreateHttpClient();
        var api = new ApiClient(c);
        var login = await api.LoginFullAsync(e, p);
        var jwt = new JwtSecurityTokenHandler().ReadJwtToken(login.AccessToken);
        return Guid.Parse(jwt.Claims.First(x => x.Type == "nameid" || x.Type == "sub").Value);
    }

    [Fact]
    public async Task AC1_Mission_token_carries_required_claims_and_long_lifetime()
    {
        // Arrange
        var (pilot,    pp) = await SeedUser("p1", role: 40);   // Admin role to be allowed by RequireAuthorization
        var (aircraft, ap) = await SeedUser("a1", role: 30);   // CompanionPC
        try
        {
            var aircraftId = await GetUserId(aircraft);

            using var client = _fixture.CreateHttpClient();
            var api = new ApiClient(client);
            var pilotLogin = await api.LoginFullAsync(pilot, pp);
            client.DefaultRequestHeaders.Authorization = new AuthenticationHeaderValue("Bearer", pilotLogin.AccessToken);

            var req = new
            {
                missionId        = "M-2026-05-14-001",
                aircraftId       = aircraftId,
                plannedDurationH = 8.0,
                requestedScope   = new[] { "submit_telemetry", "fetch_mission" },
            };

            // Act
            using var resp = await client.PostAsJsonAsync("/sessions/mission", req);
            resp.StatusCode.Should().Be(HttpStatusCode.OK);
            var body = await resp.Content.ReadFromJsonAsync<MissionResponse>();
            body.Should().NotBeNull();

            // Assert — claims
            var jwt = new JwtSecurityTokenHandler().ReadJwtToken(body!.AccessToken);
            jwt.Claims.Should().Contain(c => c.Type == "mission_id"   && c.Value == "M-2026-05-14-001");
            jwt.Claims.Should().Contain(c => c.Type == "aircraft_id"  && c.Value == aircraftId.ToString());
            jwt.Claims.Should().Contain(c => c.Type == "token_class"  && c.Value == "mission");
            jwt.Audiences.Should().Contain("satellite-provider");

            // Lifetime: 8 h planned + 1 h buffer = 9 h ±60 s
            var driftSeconds = (jwt.ValidTo - DateTime.UtcNow.AddHours(9)).TotalSeconds;
            Math.Abs(driftSeconds).Should().BeLessThan(60);

            // Sessions row class=mission, aircraft_id set
            (await _fixture.Db.CountActiveSessionsForUser(pilot, "mission")).Should().Be(1);
            (await _fixture.Db.CountOpenMissionsForAircraft(aircraftId)).Should().Be(1);
        }
        finally
        {
            await CleanupUser(pilot);
            await CleanupUser(aircraft);
        }
    }

    [Fact]
    public async Task AC2_Mission_id_must_match_pattern()
    {
        var (pilot, pp) = await SeedUser("p2", role: 40);
        var (aircraft, _) = await SeedUser("a2", role: 30);
        try
        {
            var aircraftId = await GetUserId(aircraft);

            using var client = _fixture.CreateHttpClient();
            var api = new ApiClient(client);
            var pilotLogin = await api.LoginFullAsync(pilot, pp);
            client.DefaultRequestHeaders.Authorization = new AuthenticationHeaderValue("Bearer", pilotLogin.AccessToken);

            var req = new
            {
                missionId        = "not-a-mission-id",
                aircraftId,
                plannedDurationH = 1.0,
                requestedScope   = (string[])[]
            };

            using var resp = await client.PostAsJsonAsync("/sessions/mission", req);
            resp.StatusCode.Should().Be(HttpStatusCode.BadRequest);
        }
        finally
        {
            await CleanupUser(pilot);
            await CleanupUser(aircraft);
        }
    }

    [Theory]
    [InlineData(0.05)]   // < 6 min
    [InlineData(13.0)]   // > 12 h cap
    public async Task AC2_Planned_duration_must_be_within_bounds(double hours)
    {
        var (pilot,    pp) = await SeedUser("p3", role: 40);
        var (aircraft, _)  = await SeedUser("a3", role: 30);
        try
        {
            var aircraftId = await GetUserId(aircraft);

            using var client = _fixture.CreateHttpClient();
            var api = new ApiClient(client);
            var pilotLogin = await api.LoginFullAsync(pilot, pp);
            client.DefaultRequestHeaders.Authorization = new AuthenticationHeaderValue("Bearer", pilotLogin.AccessToken);

            var req = new
            {
                missionId        = "M-2026-05-14-002",
                aircraftId,
                plannedDurationH = hours,
            };

            using var resp = await client.PostAsJsonAsync("/sessions/mission", req);
            resp.StatusCode.Should().Be(HttpStatusCode.BadRequest);
        }
        finally
        {
            await CleanupUser(pilot);
            await CleanupUser(aircraft);
        }
    }

    [Fact]
    public async Task AC3_Aircraft_must_exist_with_companionpc_role()
    {
        var (pilot, pp) = await SeedUser("p4", role: 40);
        var (notAircraft, _) = await SeedUser("a4", role: 10); // ResourceUploader, not CompanionPC
        try
        {
            var bogusId = await GetUserId(notAircraft);

            using var client = _fixture.CreateHttpClient();
            var api = new ApiClient(client);
            var pilotLogin = await api.LoginFullAsync(pilot, pp);
            client.DefaultRequestHeaders.Authorization = new AuthenticationHeaderValue("Bearer", pilotLogin.AccessToken);

            var req = new
            {
                missionId        = "M-2026-05-14-003",
                aircraftId       = bogusId,
                plannedDurationH = 1.0,
            };

            using var resp = await client.PostAsJsonAsync("/sessions/mission", req);
            resp.StatusCode.Should().Be(HttpStatusCode.BadRequest);
        }
        finally
        {
            await CleanupUser(pilot);
            await CleanupUser(notAircraft);
        }
    }

    [Fact]
    public async Task AC4_Aircraft_login_auto_revokes_open_mission_sessions()
    {
        var (pilot,    pp) = await SeedUser("p5", role: 40);
        var (aircraft, ap) = await SeedUser("a5", role: 30);
        try
        {
            var aircraftId = await GetUserId(aircraft);

            // Pilot mints a mission token for the aircraft
            using var pilotClient = _fixture.CreateHttpClient();
            var pilotApi = new ApiClient(pilotClient);
            var pilotLogin = await pilotApi.LoginFullAsync(pilot, pp);
            pilotClient.DefaultRequestHeaders.Authorization = new AuthenticationHeaderValue("Bearer", pilotLogin.AccessToken);

            using var mintResp = await pilotClient.PostAsJsonAsync("/sessions/mission", new
            {
                missionId        = "M-2026-05-14-004",
                aircraftId       = aircraftId,
                plannedDurationH = 6.0,
            });
            mintResp.StatusCode.Should().Be(HttpStatusCode.OK);
            (await _fixture.Db.CountOpenMissionsForAircraft(aircraftId)).Should().Be(1);

            // Act — aircraft reconnects: logs in as itself
            using var aircraftClient = _fixture.CreateHttpClient();
            var aircraftApi = new ApiClient(aircraftClient);
            await aircraftApi.LoginFullAsync(aircraft, ap);

            // Assert — mission session for this aircraft is gone (post-flight reconnect)
            (await _fixture.Db.CountOpenMissionsForAircraft(aircraftId)).Should().Be(0);
        }
        finally
        {
            await CleanupUser(pilot);
            await CleanupUser(aircraft);
        }
    }

    private sealed class MissionResponse
    {
        public string   AccessToken { get; init; } = "";
        public DateTime AccessExp   { get; init; }
        public string   TokenClass  { get; init; } = "";
        public Guid     SessionId   { get; init; }
    }
}