using Model;
using Model.Dto.Asset;
using Model.Entity.Asset;
using ORM;
using QRCoder;
using Service.Interface;
using SqlSugar;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;

namespace Service.Implement
{
    /// <summary>
    /// 设备二维码 服务实现
    /// 扫码直达 URL 约定：{baseUrl}/asset/ledger/equipment?id={equipmentId}
    /// baseUrl 由 Controller 从 HTTP 请求（scheme://host）传入；如需固定域名可改为读 sys_param 的 site_base_url
    /// </summary>
    public class QrCodeService : IQrCodeService
    {
        public async Task<Result<QrCodeDto>> GenerateAsync(long equipmentId, string baseUrl)
        {
            if (equipmentId <= 0) return Result<QrCodeDto>.Error("设备Id无效");
            try
            {
                var entity = await LoadEquipmentAsync(equipmentId);
                if (entity == null) return Result<QrCodeDto>.Error("设备不存在或已被删除");

                var url = BuildQrUrl(baseUrl, equipmentId);
                if (string.IsNullOrEmpty(entity.QrCodeUrl))
                {
                    await SqlSugarContext.DbContext.Updateable<EquipmentEntity>()
                        .SetColumns(x => x.QrCodeUrl == url)
                        .Where(x => x.Id == equipmentId).ExecuteCommandAsync();
                    entity.QrCodeUrl = url;
                }
                return Result<QrCodeDto>.Success(ToDto(entity));
            }
            catch (Exception ex)
            {
                return Result<QrCodeDto>.Error("生成二维码失败", ex);
            }
        }

        public async Task<Result<byte[]>> GenerateImageAsync(long equipmentId, string baseUrl)
        {
            if (equipmentId <= 0) return Result<byte[]>.Error("设备Id无效");
            try
            {
                var entity = await LoadEquipmentAsync(equipmentId);
                if (entity == null) return Result<byte[]>.Error("设备不存在或已被删除");

                var url = string.IsNullOrEmpty(entity.QrCodeUrl) ? BuildQrUrl(baseUrl, equipmentId) : entity.QrCodeUrl;
                if (string.IsNullOrEmpty(entity.QrCodeUrl))
                {
                    await SqlSugarContext.DbContext.Updateable<EquipmentEntity>()
                        .SetColumns(x => x.QrCodeUrl == url)
                        .Where(x => x.Id == equipmentId).ExecuteCommandAsync();
                    entity.QrCodeUrl = url;
                }

                var png = EncodePng(url);
                return Result<byte[]>.Success(png);
            }
            catch (Exception ex)
            {
                return Result<byte[]>.Error("生成二维码图片失败", ex);
            }
        }

        public async Task<Result<List<QrCodeBatchResultDto>>> BatchGenerateAsync(long[] equipmentIds, string baseUrl)
        {
            if (equipmentIds == null || equipmentIds.Length == 0)
                return Result<List<QrCodeBatchResultDto>>.Error("设备Id列表不能为空");
            var results = new List<QrCodeBatchResultDto>();
            foreach (var id in equipmentIds.Distinct())
            {
                var r = await GenerateAsync(id, baseUrl);
                results.Add(new QrCodeBatchResultDto
                {
                    EquipmentId = id.ToString(),
                    EquipmentCode = r.Data?.EquipmentCode,
                    EquipmentName = r.Data?.EquipmentName,
                    QrCodeUrl = r.Data?.QrCodeUrl,
                    Success = r.IsSuccess,
                    Message = r.IsSuccess ? "成功" : r.Msg
                });
            }
            return Result<List<QrCodeBatchResultDto>>.Success(results);
        }

        public async Task<Result<List<QrCodeDto>>> GetListPagedAsync(int pageIndex, int pageSize, RefAsync<int> total, string? keyword = null, bool qrOnly = false)
        {
            try
            {
                var list = await SqlSugarContext.DbContext.Queryable<EquipmentEntity>()
                    .Where(x => x.IsDel == 0)
                    .WhereIF(!string.IsNullOrWhiteSpace(keyword), x => x.Code!.Contains(keyword!) || x.Name!.Contains(keyword!))
                    .WhereIF(qrOnly, x => x.QrCodeUrl != null && x.QrCodeUrl != "")
                    .OrderBy(x => x.Code)
                    .ToPageListAsync(pageIndex, pageSize, total);
                return Result<List<QrCodeDto>>.Success(list.Select(ToDto).ToList());
            }
            catch (Exception ex)
            {
                return Result<List<QrCodeDto>>.Error("查询二维码列表失败", ex);
            }
        }

        public async Task<Result<string>> GetPrintHtmlAsync(long equipmentId, string baseUrl)
        {
            if (equipmentId <= 0) return Result<string>.Error("设备Id无效");
            try
            {
                var entity = await LoadEquipmentAsync(equipmentId);
                if (entity == null) return Result<string>.Error("设备不存在或已被删除");

                var url = string.IsNullOrEmpty(entity.QrCodeUrl) ? BuildQrUrl(baseUrl, equipmentId) : entity.QrCodeUrl;
                var png = EncodePng(url);
                var base64 = Convert.ToBase64String(png);

                var html = BuildPrintHtml(entity, url, base64);
                return Result<string>.Success(html);
            }
            catch (Exception ex)
            {
                return Result<string>.Error("生成打印页失败", ex);
            }
        }

        public async Task<Result> BindRfidAsync(long equipmentId, string rfidCode)
        {
            if (equipmentId <= 0) return Result.Error("设备Id无效");
            if (string.IsNullOrWhiteSpace(rfidCode)) return Result.Error("RFID 编号不能为空");
            try
            {
                var exists = await SqlSugarContext.DbContext.Queryable<EquipmentEntity>()
                    .Where(x => x.Id == equipmentId && x.IsDel == 0).AnyAsync();
                if (!exists) return Result.Error("设备不存在或已被删除");

                await SqlSugarContext.DbContext.Updateable<EquipmentEntity>()
                    .SetColumns(x => x.RfidCode == rfidCode)
                    .Where(x => x.Id == equipmentId).ExecuteCommandAsync();
                return Result.Success();
            }
            catch (Exception ex)
            {
                return Result.Error("绑定 RFID 失败", ex);
            }
        }

        // ==================== 私有工具 ====================

        private static async Task<EquipmentEntity?> LoadEquipmentAsync(long id)
            => await SqlSugarContext.DbContext.Queryable<EquipmentEntity>()
                .Where(x => x.Id == id && x.IsDel == 0).FirstAsync();

        private static QrCodeDto ToDto(EquipmentEntity e) => new()
        {
            EquipmentId = e.Id.ToString(),
            EquipmentCode = e.Code,
            EquipmentName = e.Name,
            Location = e.Location,
            QrCode = e.QrCode,
            QrCodeUrl = e.QrCodeUrl,
            RfidCode = e.RfidCode
        };

        private static string BuildQrUrl(string baseUrl, long equipmentId)
        {
            var b = (baseUrl ?? string.Empty).TrimEnd('/');
            return $"{b}/asset/ledger/equipment?id={equipmentId}";
        }

        private static byte[] EncodePng(string content)
        {
            using var gen = new QRCodeGenerator();
            var data = gen.CreateQrCode(content, QRCodeGenerator.ECCLevel.Q);
            var png = new PngByteQRCode(data);
            return png.GetGraphic(20); // 20 px per module，便于扫描识别
        }

        private static string BuildPrintHtml(EquipmentEntity e, string url, string base64)
        {
            // 简单 A4 打印模板：左侧二维码，右侧设备信息；浏览器 window.print() 即可
            var safe = (string? s) => System.Net.WebUtility.HtmlEncode(s ?? string.Empty);
            return $@"<!DOCTYPE html>
<html lang='zh-CN'>
<head>
<meta charset='utf-8' />
<title>设备二维码 - {safe(e.Name)}</title>
<style>
  @page {{ size: A4; margin: 12mm; }}
  body {{ font-family: 'Microsoft YaHei', sans-serif; color: #303133; }}
  .label {{ border:1px solid #303133; border-radius:6px; padding:16px; display:flex; gap:24px; align-items:center; max-width:480px; }}
  .qr img {{ width: 220px; height: 220px; }}
  .info dl {{ margin:0; }}
  .info dt {{ font-size:13px; color:#909399; margin-top:8px; }}
  .info dd {{ font-size:16px; margin:4px 0 0 0; font-weight:600; }}
  .info h2 {{ margin:0 0 8px 0; font-size:20px; }}
  .url {{ margin-top:12px; font-size:12px; color:#909399; word-break:break-all; }}
  .actions {{ margin-top:16px; }}
  .actions button {{ padding:6px 16px; font-size:14px; cursor:pointer; }}
</style>
</head>
<body>
  <div class='label'>
    <div class='qr'><img src='data:image/png;base64,{base64}' alt='QR' /></div>
    <div class='info'>
      <h2>{safe(e.Name)}</h2>
      <dl>
        <dt>设备编号</dt><dd>{safe(e.Code)}</dd>
        <dt>二维码编号</dt><dd>{safe(e.QrCode)}</dd>
        <dt>存放位置</dt><dd>{safe(e.Location)}</dd>
        <dt>责任人</dt><dd>{safe(e.ResponsiblePerson)}</dd>
      </dl>
      <div class='url'>{safe(url)}</div>
    </div>
  </div>
  <div class='actions'><button onclick='window.print()'>打印</button></div>
  <script>window.onload=function(){{setTimeout(function(){{window.print();}},300);}};</script>
</body>
</html>";
        }
    }
}