using System.Net;
using System.Net.Http.Headers;
using System.Net.Http.Json;

namespace Bff.Tests;

public class SelfServiceEndpointTests
{
    private static HttpRequestMessage Submit(string? bearer)
    {
        var request = new HttpRequestMessage(HttpMethod.Post, "/self-service/registrations")
        {
            Content = JsonContent.Create(new { }),
        };
        if (bearer is not null)
            request.Headers.Authorization = new AuthenticationHeaderValue("Bearer", bearer);
        return request;
    }

    [Fact]
    public async Task Rejects_a_request_without_a_token()
    {
        using var factory = new BffFactory();
        var client = factory.CreateClient();

        var response = await client.SendAsync(Submit(bearer: null));

        Assert.Equal(HttpStatusCode.Unauthorized, response.StatusCode);
        Assert.Null(factory.Domain.SubmittedBsn);
    }

    [Theory]
    [InlineData("not-a-jwt")]
    public async Task Rejects_a_malformed_token(string bearer)
    {
        using var factory = new BffFactory();
        var response = await factory.CreateClient().SendAsync(Submit(bearer));

        Assert.Equal(HttpStatusCode.Unauthorized, response.StatusCode);
    }

    [Fact]
    public async Task Rejects_a_token_signed_with_the_wrong_key()
    {
        using var factory = new BffFactory();
        var response = await factory.CreateClient().SendAsync(Submit(TestTokens.WrongKey("123456782")));

        Assert.Equal(HttpStatusCode.Unauthorized, response.StatusCode);
    }

    [Fact]
    public async Task Rejects_an_expired_token()
    {
        using var factory = new BffFactory();
        var response = await factory.CreateClient().SendAsync(Submit(TestTokens.Expired("123456782")));

        Assert.Equal(HttpStatusCode.Unauthorized, response.StatusCode);
    }

    [Fact]
    public async Task Accepts_a_valid_token_and_forwards_the_bsn_to_the_domain()
    {
        using var factory = new BffFactory();
        var client = factory.CreateClient();

        var response = await client.SendAsync(Submit(TestTokens.Valid("123456782")));

        Assert.Equal(HttpStatusCode.Accepted, response.StatusCode);
        Assert.Equal("123456782", factory.Domain.SubmittedBsn);
        var body = await response.Content.ReadFromJsonAsync<SubmitAcceptedDto>();
        Assert.Equal("reg-123", body!.RegistrationId);
    }

    private static HttpRequestMessage Withdraw(string? bearer, string id = "reg-123")
    {
        var request = new HttpRequestMessage(HttpMethod.Post, $"/self-service/registrations/{id}/withdraw");
        if (bearer is not null)
            request.Headers.Authorization = new AuthenticationHeaderValue("Bearer", bearer);
        return request;
    }

    [Fact]
    public async Task Rejects_a_withdrawal_without_a_token()
    {
        using var factory = new BffFactory();

        var response = await factory.CreateClient().SendAsync(Withdraw(bearer: null));

        Assert.Equal(HttpStatusCode.Unauthorized, response.StatusCode);
        Assert.Null(factory.Domain.Withdrawn);
    }

    [Fact]
    public async Task Withdraws_the_callers_registration_forwarding_the_id_and_bsn()
    {
        using var factory = new BffFactory();

        var response = await factory.CreateClient().SendAsync(Withdraw(TestTokens.Valid("123456782"), "reg-9"));

        Assert.Equal(HttpStatusCode.NoContent, response.StatusCode);
        Assert.Equal(("reg-9", "123456782"), factory.Domain.Withdrawn);
    }

    [Fact]
    public async Task Relays_not_found_when_the_registration_is_unknown_or_not_the_callers()
    {
        using var factory = new BffFactory();
        factory.Domain.WithdrawSucceeds = false;

        var response = await factory.CreateClient().SendAsync(Withdraw(TestTokens.Valid("123456782")));

        Assert.Equal(HttpStatusCode.NotFound, response.StatusCode);
    }

    private static HttpRequestMessage ProvideDocuments(string? bearer, string id = "reg-123")
    {
        var request = new HttpRequestMessage(HttpMethod.Post, $"/self-service/registrations/{id}/documents")
        {
            // The portal base64-encodes the file client-side and posts it as JSON (S-10b); the bsn is
            // never in the body — it comes from the DigiD token.
            Content = JsonContent.Create(new
            {
                contentBase64 = Convert.ToBase64String([1, 2, 3]),
                fileName = "diploma.pdf",
                contentType = "application/pdf",
            }),
        };
        if (bearer is not null)
            request.Headers.Authorization = new AuthenticationHeaderValue("Bearer", bearer);
        return request;
    }

    [Fact]
    public async Task Rejects_providing_documents_without_a_token()
    {
        using var factory = new BffFactory();

        var response = await factory.CreateClient().SendAsync(ProvideDocuments(bearer: null));

        Assert.Equal(HttpStatusCode.Unauthorized, response.StatusCode);
        Assert.Null(factory.Domain.DocumentsProvidedFor);
    }

    [Fact]
    public async Task Provides_documents_for_the_callers_registration_forwarding_id_bsn_and_file()
    {
        using var factory = new BffFactory();

        var response = await factory.CreateClient().SendAsync(ProvideDocuments(TestTokens.Valid("123456782"), "reg-9"));

        Assert.Equal(HttpStatusCode.NoContent, response.StatusCode);
        var provided = factory.Domain.DocumentsProvidedFor;
        Assert.NotNull(provided);
        Assert.Equal("reg-9", provided!.Value.RegistrationId);
        Assert.Equal("123456782", provided.Value.Bsn);
        Assert.Equal(Convert.ToBase64String([1, 2, 3]), provided.Value.ContentBase64);
        Assert.Equal("diploma.pdf", provided.Value.FileName);
    }

    [Fact]
    public async Task Relays_not_found_providing_documents_for_an_unknown_or_not_owned_registration()
    {
        using var factory = new BffFactory();
        factory.Domain.ProvideDocumentsSucceeds = false;

        var response = await factory.CreateClient().SendAsync(ProvideDocuments(TestTokens.Valid("123456782")));

        Assert.Equal(HttpStatusCode.NotFound, response.StatusCode);
    }

    private sealed record SubmitAcceptedDto(string RegistrationId, string Status);
}