using Model;
using Model.Entity.Asset;
using ORM;
using Service.Interface;
using SqlSugar;
using System;
using System.Collections.Generic;
using System.IO;
using System.Threading.Tasks;

namespace Service.Implement
{
    /// <summary>
    /// 设备附件服务实现（资产附件管理）
    /// </summary>
    public class EquipmentAttachmentService : IEquipmentAttachmentService
    {
        private readonly SqlSugarRepository<EquipmentAttachmentEntity> _repository;

        public EquipmentAttachmentService(SqlSugarRepository<EquipmentAttachmentEntity> repository)
        {
            _repository = repository;
        }

        /// <summary>
        /// 查询指定设备的附件列表（按上传时间倒序）
        /// </summary>
        public async Task<Result<List<EquipmentAttachmentEntity>>> GetByEquipmentAsync(long equipmentId)
        {
            try
            {
                var list = await _repository.Entities
                                            .Where(x => x.EquipmentId == equipmentId && x.IsDel == 0)
                                            .OrderBy(x => x.CreateTime, OrderByType.Desc)
                                            .ToListAsync();
                return Result<List<EquipmentAttachmentEntity>>.Success(list);
            }
            catch (Exception ex)
            {
                return Result<List<EquipmentAttachmentEntity>>.Error("查询附件列表失败", ex);
            }
        }

        /// <summary>
        /// 上传附件（保存文件到 uploads 目录并写入附件记录）
        /// </summary>
        public async Task<Result<EquipmentAttachmentEntity>> UploadAsync(long equipmentId, Stream stream, string originalFileName, long fileSize,
            AttachmentTypeEnum fileType, string? uploader, string? remark, string webRootPath)
        {
            if (equipmentId <= 0)
            {
                return Result<EquipmentAttachmentEntity>.Error("设备 Id 无效");
            }
            if (stream == null || fileSize <= 0)
            {
                return Result<EquipmentAttachmentEntity>.Error("上传文件为空");
            }

            try
            {
                // 按设备分目录存储：uploads/equipment/{equipmentId}/
                string relativeDir = Path.Combine("uploads", "equipment", equipmentId.ToString());
                string physicalDir = Path.Combine(webRootPath, relativeDir);
                if (!Directory.Exists(physicalDir))
                {
                    Directory.CreateDirectory(physicalDir);
                }

                // 存储文件名：时间戳 + 原扩展名，避免重名与中文路径问题
                string ext = Path.GetExtension(originalFileName);
                string storedName = $"{DateTime.Now:yyyyMMddHHmmssfff}{ext}";
                string physicalPath = Path.Combine(physicalDir, storedName);

                using (var fileStream = new FileStream(physicalPath, FileMode.Create))
                {
                    await stream.CopyToAsync(fileStream);
                }

                var entity = new EquipmentAttachmentEntity
                {
                    EquipmentId = equipmentId,
                    FileName = originalFileName,
                    FileType = fileType,
                    FileExt = ext,
                    FileUrl = $"/{relativeDir.Replace('\\', '/')}/{storedName}",
                    FileSize = fileSize,
                    Uploader = uploader,
                    Remark = remark,
                    CreateTime = DateTime.Now
                };

                await _repository.Context.Insertable(entity).ExecuteCommandAsync();
                return Result<EquipmentAttachmentEntity>.Success(entity);
            }
            catch (Exception ex)
            {
                return Result<EquipmentAttachmentEntity>.Error("上传附件失败", ex);
            }
        }

        /// <summary>
        /// 删除附件（软删除记录并删除物理文件）
        /// </summary>
        public async Task<Result<bool>> DeleteAsync(long id)
        {
            if (id <= 0)
            {
                return Result<bool>.Error("附件 Id 无效");
            }
            try
            {
                var attachment = await _repository.Entities
                                                  .Where(x => x.Id == id && x.IsDel == 0)
                                                  .FirstAsync();
                if (attachment == null)
                {
                    return Result<bool>.Error("附件不存在或已被删除");
                }

                var result = await _repository.Context.Updateable<EquipmentAttachmentEntity>()
                                              .SetColumns(x => x.IsDel == 1)
                                              .Where(x => x.Id == id)
                                              .ExecuteCommandAsync();

                // 删除物理文件（失败不影响记录删除结果）
                try
                {
                    string webRoot = Path.Combine(AppDomain.CurrentDomain.BaseDirectory, "wwwroot");
                    string physicalPath = Path.Combine(webRoot, (attachment.FileUrl ?? string.Empty).TrimStart('/').Replace('/', Path.DirectorySeparatorChar));
                    if (File.Exists(physicalPath))
                    {
                        File.Delete(physicalPath);
                    }
                }
                catch
                {
                    // 物理文件删除失败忽略
                }

                return Result<bool>.Success(result > 0);
            }
            catch (Exception ex)
            {
                return Result<bool>.Error("删除附件失败", ex);
            }
        }
    }
}