using System.Net.Http.Json;
using Microsoft.Extensions.Options;
using EnvelopeGenerator.ReceiverUI.Options;
using EnvelopeGenerator.ReceiverUI.Models;

namespace EnvelopeGenerator.ReceiverUI.Services;

/// <summary>
/// Client service for managing cached signatures via API.
/// </summary>
public class SignatureCacheService(HttpClient http, IOptions<ApiOptions> apiOptions)
{
    private readonly ApiOptions _api = apiOptions.Value;

    public async Task SaveSignatureAsync(
        string envelopeKey,
        SignatureCaptureDto signature,
        CancellationToken cancel = default)
    {
        var response = await http.PostAsJsonAsync(
            $"{_api.BaseUrl}/api/Cache/SignatureCapture/{Uri.EscapeDataString(envelopeKey)}",
            signature,
            cancel);

        if (!response.IsSuccessStatusCode)
        {
            var error = await response.Content.ReadAsStringAsync(cancel);
            throw new HttpRequestException($"Failed to cache signature: {response.StatusCode} - {error}");
        }
    }

    public async Task<SignatureCaptureDto?> GetSignatureAsync(
        string envelopeKey,
        CancellationToken cancel = default)
    {
        var response = await http.GetAsync(
            $"{_api.BaseUrl}/api/Cache/SignatureCapture/{Uri.EscapeDataString(envelopeKey)}",
            cancel);

        if (response.StatusCode == System.Net.HttpStatusCode.NotFound)
            return null;

        if (!response.IsSuccessStatusCode)
        {
            var error = await response.Content.ReadAsStringAsync(cancel);
            throw new HttpRequestException($"Failed to retrieve signature: {response.StatusCode} - {error}");
        }

        return await response.Content.ReadFromJsonAsync<SignatureCaptureDto>(cancellationToken: cancel);
    }

    public async Task DeleteSignatureAsync(
        string envelopeKey,
        CancellationToken cancel = default)
    {
        var response = await http.DeleteAsync(
            $"{_api.BaseUrl}/api/Cache/SignatureCapture/{Uri.EscapeDataString(envelopeKey)}",
            cancel);

        if (!response.IsSuccessStatusCode)
        {
            var error = await response.Content.ReadAsStringAsync(cancel);
            throw new HttpRequestException($"Failed to delete signature: {response.StatusCode} - {error}");
        }
    }
}