namespace WebApi.Controllers;

/// <summary>
/// 账单导入控制器
/// </summary>
[ApiController]
[Route("api/[controller]/[action]")]
public class BillImportController(
    ILogger<BillImportController> logger,
    IImportService importService
) : ControllerBase
{
    /// <summary>
    /// 上传账单文件
    /// </summary>
    /// <param name="file">账单文件</param>
    /// <param name="type">账单类型（Alipay | WeChat）</param>
    /// <returns></returns>
    [HttpPost]
    public async Task<BaseResponse<object>> UploadFile(
        [FromForm] IFormFile file,
        [FromForm] string type
    )
    {
        try
        {
            // 验证参数
            if (file.Length == 0)
            {
                return BaseResponse<object>.Fail("请选择要上传的文件");
            }

            if (string.IsNullOrWhiteSpace(type) || (type != "Alipay" && type != "WeChat"))
            {
                return BaseResponse<object>.Fail("账单类型参数错误，必须是 Alipay 或 WeChat");
            }

            // 验证文件类型
            var allowedExtensions = new[] { ".csv", ".xlsx", ".xls" };
            var fileExtension = Path.GetExtension(file.FileName).ToLowerInvariant();
            if (!allowedExtensions.Contains(fileExtension))
            {
                return BaseResponse<object>.Fail("只支持 CSV 或 Excel 文件格式");
            }

            // 验证文件大小（10MB限制）
            const long maxFileSize = 10 * 1024 * 1024;
            if (file.Length > maxFileSize)
            {
                return BaseResponse<object>.Fail("文件大小不能超过 10MB");
            }

            // 生成唯一文件名
            var fileName = $"{type}_{DateTime.Now:yyyyMMddHHmmss}_{Guid.NewGuid():N}{fileExtension}";

            // 保存文件
            var ok = false;
            var message = string.Empty;
            await using (var stream = new MemoryStream())
            {
                await file.CopyToAsync(stream);
                if (type == "Alipay")
                {
                    (ok, message) = await importService.ImportAlipayAsync(stream, fileExtension);
                }
                else if (type == "WeChat")
                {
                    (ok, message) = await importService.ImportWeChatAsync(stream, fileExtension);
                }
            }

            return new BaseResponse<object>
            {
                Success = ok,
                Message = message
            };
        }
        catch (Exception ex)
        {
            logger.LogError(ex, "文件上传失败，类型: {Type}", type);
            return BaseResponse<object>.Fail($"文件上传失败: {ex.Message}");
        }
    }
}