using Microsoft.AspNetCore.Mvc;
using Microsoft.Extensions.Configuration;
using COSXML;
using COSXML.Auth;
using COSXML.Model.Tag;

namespace ZR.Admin.WebApi.Controllers.Business
{
    /// <summary>
    /// COS 预签名上传
    /// </summary>
    [Route("business/CosUpload")]
    public class CosUploadController : BaseController
    {
        private readonly IConfiguration _config;

        public CosUploadController(IConfiguration config)
        {
            _config = config;
        }

        /// <summary>
        /// 获取 COS PUT 预签名 URL（前端直传）
        /// </summary>
        [HttpPost("presignUrl")]
        public IActionResult GetPresignUrl([FromBody] CosPresignRequestDto dto)
        {
            var section = _config.GetSection("TencentCos");
            var appId = section["AppId"];
            var bucket = section["Bucket"];
            var region = section["Region"];
            var secretId = section["SecretId"];
            var secretKey = section["SecretKey"];
            var domainUrl = section["DomainUrl"];
            var expireMinutes = int.Parse(section["PresignExpireMinutes"] ?? "10");

            int count = Math.Clamp(dto.Count, 1, 9);
            string ext = string.IsNullOrWhiteSpace(dto.Ext) ? ".jpg" : dto.Ext;

            var cosConfig = new CosXmlConfig.Builder()
                .SetRegion(region)
                .Build();

            var credentialProvider = new DefaultQCloudCredentialProvider(
                secretId, secretKey, (long)expireMinutes * 60);
            var cosXml = new CosXmlServer(cosConfig, credentialProvider);

            var results = new List<object>();
            var dateDir = DateTime.Now.ToString("yyyyMMdd");

            for (int i = 0; i < count; i++)
            {
                var cosKey = $"fault-images/{dateDir}/{Guid.NewGuid():N}{ext}";

                var preSignatureStruct = new PreSignatureStruct
                {
                    appid = appId,
                    bucket = bucket,
                    region = region,
                    key = cosKey,
                    httpMethod = "PUT",
                    isHttps = true,
                    signDurationSecond = expireMinutes * 60,
                    headers = null,
                    queryParameters = null
                };

                var presignUrl = cosXml.GenerateSignURL(preSignatureStruct);
                var accessUrl = $"{domainUrl.TrimEnd('/')}/{cosKey}";

                results.Add(new { cosKey, presignUrl, accessUrl });
            }

            return SUCCESS(results);
        }
    }

    public class CosPresignRequestDto
    {
        /// <summary>
        /// 需要上传的文件数量
        /// </summary>
        public int Count { get; set; } = 1;

        /// <summary>
        /// 文件扩展名，如 .jpg
        /// </summary>
        public string Ext { get; set; } = ".jpg";
    }
}