// FastOcr.cs — fastOcr 验证码识别 C# SDK（零依赖，单文件）
// 用法: 把此文件复制到项目中，var client = new FastOcr("your_api_key");
using System;
using System.IO;
using System.Net.Http;
using System.Text;
using System.Threading.Tasks;

public class FastOcr
{
    private readonly string _apiKey;
    private readonly string _baseUrl;
    private static readonly HttpClient _http = new HttpClient();

    public FastOcr(string apiKey, string baseUrl = "http://shenzheng.cstext.top:8989")
    {
        _apiKey = apiKey;
        _baseUrl = baseUrl.TrimEnd('/');
    }

    public async Task<string> RecognizeAsync(string type, string imagePath, string piecePath = null)
    {
        var imgB64 = Convert.ToBase64String(File.ReadAllBytes(imagePath));
        var body = $"{{\"type\":\"{type}\",\"image\":\"{imgB64}\"";
        if (piecePath != null)
        {
            var pieceB64 = Convert.ToBase64String(File.ReadAllBytes(piecePath));
            body += $",\"piece\":\"{pieceB64}\"";
        }
        body += "}";
        return await PostAsync("/api/v1/captcha/recognize", body);
    }

    public async Task<string> GetBalanceAsync()
    {
        return await PostAsync("/api/v1/user/balance", "{}");
    }

    private async Task<string> PostAsync(string path, string body)
    {
        var req = new HttpRequestMessage(HttpMethod.Post, _baseUrl + path);
        req.Headers.Add("Authorization", $"Bearer {_apiKey}");
        req.Content = new StringContent(body, Encoding.UTF8, "application/json");
        var resp = await _http.SendAsync(req);
        return await resp.Content.ReadAsStringAsync();
    }
}