using System.Net.Http.Headers;
using System.Security.Cryptography;
using System.Text;
using Dlhis.Basic.Organization.Request;
using Dlhis.Basic.Organization.Response;
using Dlhis.Basic.Organization.Services;
using HttpUtil;
using Kurisu.AspNetCore.Utils.Extensions;
using Microsoft.AspNetCore.Authorization;
using Microsoft.AspNetCore.Mvc;

namespace Dlhis.Basic.Organization.Controllers;

/// <summary>
/// 档案人脸
/// </summary>
[Authorize]
[Route("api/[controller]")]
[ApiController]
public class GainfoFacesController : ControllerBase
{
    private readonly IGainfoFaceService _gainfoFaceService;
    private readonly IHttpClientFactory _httpClientFactory;

    public GainfoFacesController(IGainfoFaceService gainfoFaceService, IHttpClientFactory httpClientFactory)
    {
        _gainfoFaceService = gainfoFaceService;
        _httpClientFactory = httpClientFactory;
    }

    /// <summary>
    /// 人脸档案分页
    /// </summary>
    /// <param name="request"></param>
    /// <returns></returns>
    [HttpGet("page")]
    public async Task<GainfoFacePageSummaryResponse> GetPageAsync([FromQuery] GainfoFacePageRequest request)
    {
        return await _gainfoFaceService.GetPageAsync(request);
    }

    [AllowAnonymous]
    [HttpPost("test")]
    public async Task<string> TestAsync(GainfoFaceValidateRequest request)
    {
        var client = _httpClientFactory.CreateClient("hik-openapi");
        var body = request.ToJson();
        var url = "/artemis/api/frs/v1/application/oneToOne";
        var key = "27390082";
        var secret = "MLl7Dv7p5Pgc9XYI3r4O";

        var headers = InitRequest(url, body, key, secret);
        client.DefaultRequestHeaders.Accept.Clear();
        client.DefaultRequestHeaders.Accept.Add(new MediaTypeWithQualityHeaderValue(headers["Accept"]));
        var content = new StringContent(body, Encoding.UTF8, headers["Content-Type"]);
        foreach (var item in headers.Where(x => x.Key != "Accept").Where(x => x.Key != "Content-Type"))
        {
            content.Headers.Add(item.Key, item.Value);
        }

        var r = await client.PostAsync(url, content);
        return await r.Content.ReadAsStringAsync();
    }

    private static Dictionary<string, string> InitRequest(string url, string body, string key, string secret)
    {
        var header = new Dictionary<string, string>();

        // Accept                
        header.Add("Accept", "application/json");

        // ContentType  
        header.Add("Content-Type", "application/json");

        //if POST content-md5，be careful it must be lower case.
        string contentMd5 = computeContentMd5(body);
        header.Add("content-md5", contentMd5);

        // x-ca-timestamp
        string timestamp = ((DateTime.Now.Ticks - TimeZone.CurrentTimeZone.ToLocalTime(new System.DateTime(1970, 1, 1, 0, 0, 0, 0)).Ticks) / 1000).ToString();
        header.Add("x-ca-timestamp", timestamp);

        // x-ca-nonce
        string nonce = System.Guid.NewGuid().ToString();
        header.Add("x-ca-nonce", nonce);

        // x-ca-key
        header.Add("x-ca-key", key);

        // build string to sign
        string strToSign = buildSignString("POST", url, header);
        string signedStr = computeForHMACSHA256(strToSign, secret);

        // x-ca-signature
        header.Add("x-ca-signature", signedStr);

        return header;
    }

    /// <summary>
    /// 计算content-md5
    /// </summary>
    /// <param name="body"></param>
    /// <returns>base64后的content-md5</returns>
    private static string computeContentMd5(string body)
    {
        MD5 md5 = new MD5CryptoServiceProvider();
        byte[] result = md5.ComputeHash(System.Text.Encoding.UTF8.GetBytes(body));
        return Convert.ToBase64String(result);
    }

    /// <summary>
    /// 计算HMACSHA265
    /// </summary>
    /// <param name="str">待计算字符串</param>
    /// <param name="secret">平台APPSecet</param>
    /// <returns>HMAXH265计算结果字符串</returns>
    private static string computeForHMACSHA256(string str, string secret)
    {
        var encoder = new System.Text.UTF8Encoding();
        byte[] secretBytes = encoder.GetBytes(secret);
        byte[] strBytes = encoder.GetBytes(str);
        var opertor = new HMACSHA256(secretBytes);
        byte[] hashbytes = opertor.ComputeHash(strBytes);
        return Convert.ToBase64String(hashbytes);
    }

    /// <summary>
    /// 计算签名字符串
    /// </summary>
    /// <param name="method">HTTP请求方法，如“POST”</param>
    /// <param name="url">接口Url，如/artemis/api/resource/v1/org/advance/orgList</param>
    /// <param name="header">请求头</param>
    /// <returns>签名字符串</returns>
    private static string buildSignString(string method, string url, Dictionary<string, string> header)
    {
        StringBuilder sb = new StringBuilder();
        sb.Append(method.ToUpper()).Append("\n");
        if (null != header)
        {
            if (null != header["Accept"])
            {
                sb.Append((string)header["Accept"]);
                sb.Append("\n");
            }

            if (header.Keys.Contains("Content-MD5") && null != header["Content-MD5"])
            {
                sb.Append((string)header["Content-MD5"]);
                sb.Append("\n");
            }

            if (null != header["Content-Type"])
            {
                sb.Append((string)header["Content-Type"]);
                sb.Append("\n");
            }

            if (header.Keys.Contains("Date") && null != header["Date"])
            {
                sb.Append((string)header["Date"]);
                sb.Append("\n");
            }
        }

        // build and add header to sign
        string signHeader = buildSignHeader(header);
        sb.Append(signHeader);
        sb.Append(url);
        return sb.ToString();
    }

    /// <summary>
    /// 计算签名头
    /// </summary>
    /// <param name="header">请求头</param>
    /// <returns>签名头</returns>
    private static string buildSignHeader(Dictionary<string, string> header)
    {
        Dictionary<string, string> sortedDicHeader = new Dictionary<string, string>();
        sortedDicHeader = header;
        var dic = from objDic in sortedDicHeader orderby objDic.Key ascending select objDic;

        StringBuilder sbSignHeader = new StringBuilder();
        StringBuilder sb = new StringBuilder();
        foreach (KeyValuePair<string, string> kvp in dic)
        {
            if (kvp.Key.Replace(" ", "").Contains("x-ca-"))
            {
                sb.Append(kvp.Key + ":");
                if (!string.IsNullOrWhiteSpace(kvp.Value))
                {
                    sb.Append(kvp.Value);
                }

                sb.Append("\n");
                if (sbSignHeader.Length > 0)
                {
                    sbSignHeader.Append(",");
                }

                sbSignHeader.Append(kvp.Key);
            }
        }

        header.Add("x-ca-signature-headers", sbSignHeader.ToString());

        return sb.ToString();
    }
}