using DocumentService.Application.Common.DTOs;
using FluentAssertions;

namespace DocumentService.Tests.Live.API;

/// <summary>
/// Live tests for PDF validation endpoints.
/// Uses PdfValidationClient — routes are managed by the client, not the test.
/// Target: http://172.24.12.39:9393/
/// </summary>
[Collection("Live API")]
public class PdfValidationLiveTests : LiveApiTestBase
{
    // ──────────────────────────────────────────────────────────────
    // ValidateAsync(Stream) → multipart/form-data → /api/pdf/validation/validate
    // ──────────────────────────────────────────────────────────────

    [Fact]
    public async Task Validate_Stream_ValidPdf_ReturnsMetadata()
    {
        using var stream = LoadPdfStream("valid.pdf");

        var result = await ValidationClient.ValidateAsync(stream);

        result.Should().NotBeNull();
        result.PageCount.Should().BeGreaterThan(0);
        result.FileSizeBytes.Should().BeGreaterThan(0);
        result.PdfVersion.Should().NotBeNullOrEmpty();
        result.HasAttachments.Should().BeFalse();
        result.AttachmentCount.Should().Be(0);
    }

    [Fact]
    public async Task Validate_Stream_PdfWithAttachments_ReturnsHasAttachmentsTrue()
    {
        using var stream = LoadPdfStream("pdfWithMoreThanOneAttachment.pdf");

        var result = await ValidationClient.ValidateAsync(stream);

        result.HasAttachments.Should().BeTrue();
        result.AttachmentCount.Should().BeGreaterThan(0);
    }

    [Fact]
    public async Task Validate_Stream_PdfWithSwissQrCode_ReturnsValidResult()
    {
        using var stream = LoadPdfStream("pdfWithSwissQRCode.pdf");

        var result = await ValidationClient.ValidateAsync(stream);

        result.Should().NotBeNull();
        result.PageCount.Should().BeGreaterThan(0);
        result.FileSizeBytes.Should().BeGreaterThan(0);
    }

    [Fact]
    public async Task Validate_Stream_EmptyStream_Throws()
    {
        using var stream = new MemoryStream(Array.Empty<byte>());

        var act = async () => await ValidationClient.ValidateAsync(stream);

        await act.Should().ThrowAsync<HttpRequestException>(
            "empty file should be rejected with 400");
    }

    [Fact]
    public async Task Validate_Stream_CorruptedContent_Throws()
    {
        // Valid stream shape, but not a PDF
        byte[] garbage = "THIS IS NOT A PDF FILE"u8.ToArray();
        using var stream = new MemoryStream(garbage);

        var act = async () => await ValidationClient.ValidateAsync(stream);

        await act.Should().ThrowAsync<HttpRequestException>(
            "corrupted content should be rejected (500)");
    }

    // ──────────────────────────────────────────────────────────────
    // ValidateAsync(byte[]) → Base64 JSON → /api/pdf/validation/validate
    // ──────────────────────────────────────────────────────────────

    [Fact]
    public async Task Validate_Bytes_ValidPdf_ReturnsMetadata()
    {
        byte[] bytes = LoadPdfBytes("valid.pdf");

        var result = await ValidationClient.ValidateAsync(bytes);

        result.Should().NotBeNull();
        result.PageCount.Should().BeGreaterThan(0);
        result.FileSizeBytes.Should().BeGreaterThan(0);
        result.PdfVersion.Should().NotBeNullOrEmpty();
    }

    [Fact]
    public async Task Validate_Bytes_PdfWithAttachments_ReturnsHasAttachmentsTrue()
    {
        byte[] bytes = LoadPdfBytes("pdfWithMoreThanOneAttachment.pdf");

        var result = await ValidationClient.ValidateAsync(bytes);

        result.HasAttachments.Should().BeTrue();
        result.AttachmentCount.Should().BeGreaterThan(0);
    }

    [Fact]
    public async Task Validate_Bytes_EmptyArray_Throws()
    {
        var act = async () => await ValidationClient.ValidateAsync(Array.Empty<byte>());

        await act.Should().ThrowAsync<HttpRequestException>(
            "empty byte array encodes to empty Base64, which should be rejected");
    }

    // ──────────────────────────────────────────────────────────────
    // ValidatePdfAAsync(Stream) → multipart → /api/pdf/validation/validate-pdfa
    // ──────────────────────────────────────────────────────────────

    [Fact]
    public async Task ValidatePdfA_Stream_ValidPdf_ReturnsComplianceFields()
    {
        using var stream = LoadPdfStream("valid.pdf");

        var result = await ValidationClient.ValidatePdfAAsync(stream);

        result.Should().NotBeNull();
        result.IsValid.Should().BeTrue();
        result.PageCount.Should().BeGreaterThan(0);
        result.PdfVersion.Should().NotBeNullOrEmpty();
        result.FileSize.Should().BeGreaterThan(0);
        result.Encrypted.Should().BeFalse();
        // valid.pdf is a regular PDF, not PDF/A
        result.PdfACompliant.Should().BeFalse();
        result.PdfAVersion.Should().BeNullOrEmpty();
    }

    [Fact]
    public async Task ValidatePdfA_Stream_EncryptedPdf_ReturnsEncryptedTrue_NotCompliant()
    {
        using var stream = LoadPdfStream("encryptedPdf.pdf");

        var result = await ValidationClient.ValidatePdfAAsync(stream);

        result.Should().NotBeNull();
        result.Encrypted.Should().BeTrue();
        result.PdfACompliant.Should().BeFalse("encrypted PDFs cannot be PDF/A compliant");
    }

    [Fact]
    public async Task ValidatePdfA_Stream_EmptyStream_Throws()
    {
        using var stream = new MemoryStream(Array.Empty<byte>());

        var act = async () => await ValidationClient.ValidatePdfAAsync(stream);

        await act.Should().ThrowAsync<HttpRequestException>();
    }

    // ──────────────────────────────────────────────────────────────
    // ValidatePdfAAsync(byte[]) → Base64 JSON → /api/pdf/validation/validate-pdfa
    // ──────────────────────────────────────────────────────────────

    [Fact]
    public async Task ValidatePdfA_Bytes_ValidPdf_ReturnsComplianceFields()
    {
        byte[] bytes = LoadPdfBytes("valid.pdf");

        var result = await ValidationClient.ValidatePdfAAsync(bytes);

        result.Should().NotBeNull();
        result.IsValid.Should().BeTrue();
        result.PdfACompliant.Should().BeFalse();
        result.PageCount.Should().BeGreaterThan(0);
    }

    [Fact]
    public async Task ValidatePdfA_Bytes_EncryptedPdf_ReturnsEncryptedTrue()
    {
        byte[] bytes = LoadPdfBytes("encryptedPdf.pdf");

        var result = await ValidationClient.ValidatePdfAAsync(bytes);

        result.Encrypted.Should().BeTrue();
        result.PdfACompliant.Should().BeFalse();
    }

    [Fact]
    public async Task ValidatePdfA_Bytes_EmptyArray_Throws()
    {
        var act = async () => await ValidationClient.ValidatePdfAAsync(Array.Empty<byte>());

        await act.Should().ThrowAsync<HttpRequestException>();
    }
}