using System.Net;
using Amazon.Runtime;
using Api.SeaHavenIndustries.Infrastructure;
using Microsoft.Extensions.Options;
using SeaHaven.Services.Configuration;
using Xunit;

namespace Api.SeaHavenIndustries.Tests;

public sealed class ProcurementWorkOrderClientTests
{
    [Fact]
    public async Task Signs_every_retry_with_session_credentials_and_reads_typed_page()
    {
        var handler = new RecordingHandler(
            new HttpResponseMessage(HttpStatusCode.ServiceUnavailable),
            Json(HttpStatusCode.OK,
                """{"items":[{"work_order_id":"123","updated_at":"2026-07-24T12:00:00Z","wo_status":"new"}],"next_cursor":"opaque"}"""));
        var credentials = new RecordingCredentialsProvider();
        var client = Create(handler, credentials);

        var page = await client.GetWorkOrdersAsync(null, 100, CancellationToken.None);

        Assert.Equal("123", Assert.Single(page.Items).WorkOrderId);
        Assert.Equal("opaque", page.NextCursor);
        Assert.Equal(2, handler.Requests.Count);
        Assert.Equal(2, credentials.CallCount);
        Assert.Equal(
            "AWS4-HMAC-SHA256 Credential=access/20260724/us-east-1/execute-api/aws4_request, "
                + "SignedHeaders=host;x-amz-content-sha256;x-amz-date;x-amz-security-token, "
                + "Signature=32f2ce331e25cf7e165126108eab8a0e7313fd051647df89ee8e658cfe4a967a",
            handler.Requests[0].Authorization);
        Assert.All(handler.Requests, request =>
        {
            Assert.Equal("procurement-api.seahaven.com", request.Uri.Host);
            Assert.Contains("limit=100", request.Uri.Query);
            Assert.StartsWith("AWS4-HMAC-SHA256 Credential=access/", request.Authorization);
            Assert.Contains("/us-east-1/execute-api/aws4_request", request.Authorization);
            Assert.Equal("session-token", request.SecurityToken);
        });
    }

    [Fact]
    public async Task Encodes_cursor_and_uses_separate_comment_path()
    {
        var handler = new RecordingHandler(Json(HttpStatusCode.OK,
            """{"items":[{"work_order_id":"123","comment_id":"c1","text":"mock"}],"next_cursor":null}"""));
        var client = Create(handler, new RecordingCredentialsProvider());

        var page = await client.GetCommentsAsync("123", "a/b+c=", 50, CancellationToken.None);

        Assert.Equal("c1", Assert.Single(page.Items).CommentId);
        Assert.Equal(
            "/work-orders/123/comments?cursor=a%2Fb%2Bc%3D&limit=50",
            Assert.Single(handler.Requests).Uri.PathAndQuery);
    }

    [Fact]
    public async Task Retries_transient_network_failure_and_accepts_legacy_null_updated_at()
    {
        var handler = new ThrowingThenSuccessHandler(Json(HttpStatusCode.OK,
            """{"items":[{"work_order_id":"123","updated_at":null,"created_at":null}],"next_cursor":null}"""));
        var credentials = new RecordingCredentialsProvider();
        var client = Create(handler, credentials);

        var page = await client.GetWorkOrdersAsync(null, 100, CancellationToken.None);

        Assert.Null(Assert.Single(page.Items).UpdatedAt);
        Assert.Equal(2, handler.CallCount);
        Assert.Equal(2, credentials.CallCount);
    }

    [Fact]
    public async Task Rejects_unapproved_origin_and_oversized_response()
    {
        var options = Options("https://attacker.invalid");
        var client = new ProcurementWorkOrderClient(
            new HttpClient(new RecordingHandler(Json(HttpStatusCode.OK, """{"items":[]}"""))),
            new RecordingCredentialsProvider(),
            options,
            TimeProvider.System);
        await Assert.ThrowsAsync<InvalidOperationException>(
            () => client.GetWorkOrdersAsync(null, 100, CancellationToken.None));

        var handler = new RecordingHandler(new HttpResponseMessage(HttpStatusCode.OK)
        {
            Content = new ByteArrayContent(new byte[1025])
        });
        var bounded = Create(handler, new RecordingCredentialsProvider(), maxResponseBytes: 1024);
        await Assert.ThrowsAsync<InvalidDataException>(
            () => bounded.GetWorkOrdersAsync(null, 100, CancellationToken.None));
    }

    private static ProcurementWorkOrderClient Create(
        HttpMessageHandler handler,
        IProcurementAwsCredentialsProvider credentials,
        int maxResponseBytes = 4096) =>
        new(
            new HttpClient(handler),
            credentials,
            Options("https://procurement-api.seahaven.com", maxResponseBytes),
            new FixedTimeProvider());

    private static IOptionsMonitor<WorkOrderReconciliationOptions> Options(
        string baseUrl,
        int maxResponseBytes = 4096) =>
        new TestOptions(new WorkOrderReconciliationOptions
        {
            Enabled = true,
            BaseUrl = baseUrl,
            MaxRetries = 1,
            RetryBaseDelayMilliseconds = 0,
            MaxResponseBytes = maxResponseBytes
        });

    private static HttpResponseMessage Json(HttpStatusCode status, string json) =>
        new(status) { Content = new StringContent(json) };

    private sealed class RecordingCredentialsProvider : IProcurementAwsCredentialsProvider
    {
        public int CallCount { get; private set; }

        public Task<ImmutableCredentials> GetAsync(CancellationToken cancellationToken)
        {
            CallCount++;
            return Task.FromResult(new ImmutableCredentials(
                "access",
                "secret",
                "session-token"));
        }
    }

    private sealed class RecordingHandler : HttpMessageHandler
    {
        private readonly Queue<HttpResponseMessage> _responses;

        public RecordingHandler(params HttpResponseMessage[] responses)
        {
            _responses = new Queue<HttpResponseMessage>(responses);
        }

        public List<RecordedRequest> Requests { get; } = new();

        protected override Task<HttpResponseMessage> SendAsync(
            HttpRequestMessage request,
            CancellationToken cancellationToken)
        {
            Requests.Add(new RecordedRequest(
                request.RequestUri!,
                request.Headers.TryGetValues("Authorization", out var authorization)
                    ? authorization.Single()
                    : string.Empty,
                request.Headers.TryGetValues("X-Amz-Security-Token", out var values)
                    ? values.Single()
                    : null));
            return Task.FromResult(_responses.Dequeue());
        }
    }

    private sealed class ThrowingThenSuccessHandler : HttpMessageHandler
    {
        private readonly HttpResponseMessage _response;

        public ThrowingThenSuccessHandler(HttpResponseMessage response)
        {
            _response = response;
        }

        public int CallCount { get; private set; }

        protected override Task<HttpResponseMessage> SendAsync(
            HttpRequestMessage request,
            CancellationToken cancellationToken)
        {
            CallCount++;
            return CallCount == 1
                ? Task.FromException<HttpResponseMessage>(
                    new HttpRequestException("transient mock failure"))
                : Task.FromResult(_response);
        }
    }

    private sealed record RecordedRequest(Uri Uri, string Authorization, string? SecurityToken);

    private sealed class TestOptions : IOptionsMonitor<WorkOrderReconciliationOptions>
    {
        public TestOptions(WorkOrderReconciliationOptions value) => CurrentValue = value;
        public WorkOrderReconciliationOptions CurrentValue { get; }
        public WorkOrderReconciliationOptions Get(string? name) => CurrentValue;
        public IDisposable? OnChange(
            Action<WorkOrderReconciliationOptions, string?> listener) => null;
    }

    private sealed class FixedTimeProvider : TimeProvider
    {
        public override DateTimeOffset GetUtcNow() =>
            DateTimeOffset.Parse("2026-07-24T12:00:00Z");
    }
}