using DocumentService.Application.Common.DTOs;
using DocumentService.Application.ExtractZugferd;
using DocumentService.Client.Interfaces;
using DocumentService.Application.Common.DTOs.Requests;
using Microsoft.Extensions.Logging;
using System.Net.Http;

namespace DocumentService.Client.Clients;

/// <summary>
/// Implementation of ZUGFeRD client (detection and extraction).
/// </summary>
public class ZugferdClient(HttpClient httpClient, ILogger<ZugferdClient> logger) : BaseDocumentClient(httpClient, logger), IZugferdClient
{
    /// <inheritdoc />
    public async Task<ZugferdCheckResult> CheckAsync(Stream pdfStream, CancellationToken cancellationToken = default)
    {
        var result = await SendMultipartAsync<ZugferdCheckResult>(
            "/api/pdf/zugferd/has-zugferd",
            pdfStream,
            "document.pdf",
            cancellationToken);

        return result ?? throw new InvalidOperationException("API returned null response");
    }

    /// <inheritdoc />
    public async Task<ZugferdCheckResult> CheckAsync(byte[] pdfBytes, CancellationToken cancellationToken = default)
    {
        var request = new HasZugferdRequest { Base64Pdf = ToBase64(pdfBytes) };

        var result = await SendJsonAsync<HasZugferdRequest, ZugferdCheckResult>(
            "/api/pdf/zugferd/has-zugferd",
            request,
            cancellationToken);

        return result ?? throw new InvalidOperationException("API returned null response");
    }

    /// <inheritdoc />
    public async Task<Stream> ExtractAsync(Stream pdfStream, CancellationToken cancellationToken = default)
    {
        // asFile=true returns the XML file directly (application/xml stream)
        return await SendMultipartForStreamAsync(
            "/api/pdf/zugferd/extract?asFile=true",
            pdfStream,
            "document.pdf",
            cancellationToken);
    }

    /// <inheritdoc />
    public async Task<Stream> ExtractAsync(byte[] pdfBytes, CancellationToken cancellationToken = default)
    {
        var request = new ExtractZugferdRequest { Base64Pdf = ToBase64(pdfBytes) };

        // format=file returns the XML file directly (application/xml stream)
        return await SendJsonForStreamAsync(
            "/api/pdf/zugferd/extract?format=file",
            request,
            cancellationToken);
    }

    /// <inheritdoc />
    public async Task<ZugferdExtractionResult> ExtractAsResultAsync(Stream pdfStream, CancellationToken cancellationToken = default)
    {
        // asFile=false returns JSON with metadata + XML content
        var result = await SendMultipartAsync<ZugferdExtractionResult>(
            "/api/pdf/zugferd/extract?asFile=false",
            pdfStream,
            "document.pdf",
            cancellationToken);

        return result ?? throw new InvalidOperationException("API returned null response");
    }

    /// <inheritdoc />
    public async Task<ZugferdExtractionResult> ExtractAsResultAsync(byte[] pdfBytes, CancellationToken cancellationToken = default)
    {
        var request = new ExtractZugferdRequest { Base64Pdf = ToBase64(pdfBytes) };

        // format=json returns JSON with metadata + XML content
        var result = await SendJsonAsync<ExtractZugferdRequest, ZugferdExtractionResult>(
            "/api/pdf/zugferd/extract?format=json",
            request,
            cancellationToken);

        return result ?? throw new InvalidOperationException("API returned null response");
    }
}