package logic

import (
	"encoding/json"
	"errors"
	"fmt"
	"fusenapi/constants"
	"fusenapi/model/gmodel"
	"fusenapi/utils/auth"
	"fusenapi/utils/basic"
	"fusenapi/utils/encryption_decryption"
	"fusenapi/utils/id_generator"
	"github.com/google/uuid"
	"github.com/nfnt/resize"
	"gorm.io/gorm"
	"image"
	"image/gif"
	"image/jpeg"
	"image/png"
	"net/http"
	"os"
	"path"
	"time"

	"context"

	"fusenapi/server/product/internal/svc"
	"fusenapi/server/product/internal/types"

	"github.com/zeromicro/go-zero/core/logx"
)

type SaveDesignLogic struct {
	logx.Logger
	ctx    context.Context
	svcCtx *svc.ServiceContext
}

func NewSaveDesignLogic(ctx context.Context, svcCtx *svc.ServiceContext) *SaveDesignLogic {
	return &SaveDesignLogic{
		Logger: logx.WithContext(ctx),
		ctx:    ctx,
		svcCtx: svcCtx,
	}
}

func (l *SaveDesignLogic) SaveDesign(req *types.SaveDesignReq, userinfo *auth.UserInfo) (resp *basic.Response) {
	if userinfo.GetIdType() != auth.IDTYPE_User {
		return resp.SetStatusWithMessage(basic.CodeUnAuth, "please login first")
	}
	//查询是否是加密的(不太合理)
	encryptWebsetting, err := l.svcCtx.AllModels.FsWebSet.FindValueByKey(l.ctx, "is_encrypt")
	if err != nil {
		if errors.Is(err, gorm.ErrRecordNotFound) {
			return resp.SetStatusWithMessage(basic.CodeDbRecordNotFoundErr, "web setting is_encrypt is not exists")
		}
		logx.Error(err)
		return resp.SetStatusWithMessage(basic.CodeDbSqlErr, "failed to get web setting")
	}
	var postInfo types.SaveDesignReqRealStruct
	//不加密
	if encryptWebsetting.Value == nil || *encryptWebsetting.Value == "0" {
		if err = json.Unmarshal([]byte(req.Data), &postInfo); err != nil {
			return resp.SetStatusWithMessage(basic.CodeJsonErr, "failed to parse json data,format may be invalid")
		}
	} else { //加密的
		//解密数据
		desData, err := encryption_decryption.CBCDecrypt(req.Data)
		if err != nil {
			logx.Error(err)
			return resp.SetStatusWithMessage(basic.CodeAesCbcDecryptionErr, "failed to decryption data")
		}
		if err = json.Unmarshal([]byte(desData), &postInfo); err != nil {
			logx.Error(err)
			return resp.SetStatusWithMessage(basic.CodeJsonErr, "failed to parse json data")
		}
	}
	infoBytes, _ := json.Marshal(postInfo.Data)
	info := string(infoBytes)
	now := time.Now()
	logoColorBytes, _ := json.Marshal(postInfo.Data.Logo.Colors)
	logoColor := string(logoColorBytes)
	saveData := gmodel.FsProductDesign{
		UserId:     &userinfo.UserId,
		ProductId:  &postInfo.ProductId,
		TemplateId: &postInfo.TemplateId,
		SizeId:     &postInfo.SizeId,
		OptionalId: &postInfo.OptionalId,
		Cover:      &postInfo.Cover,
		Info:       &info,
		Utime:      &now,
		LogoColor:  &logoColor,
		PageGuid:   &postInfo.PageGuid,
	}
	switch postInfo.Sn {
	case "": //新增
		status := int64(1)
		postInfo.Sn, err = id_generator.GenSnowFlakeId()
		if err != nil {
			logx.Error(err)
			return resp.SetStatusWithMessage(basic.CodeServiceErr, "failed to gen sn ")
		}
		saveData.Status = &status
		saveData.Sn = &postInfo.Sn
		err = l.svcCtx.AllModels.FsProductDesign.Create(l.ctx, &saveData)
	default: //更新
		err = l.svcCtx.AllModels.FsProductDesign.UpdateBySn(l.ctx, postInfo.Sn, &saveData)
	}
	if err != nil {
		logx.Error(err)
		return resp.SetStatusWithMessage(basic.CodeDbSqlErr, "failed to save design")
	}
	if postInfo.Cover == "" {
		return resp.SetStatusWithMessage(basic.CodeOK, "success", types.SaveDesignRsp{Sn: postInfo.Sn})
	}
	//生成各个尺寸缩略图
	if err = l.CreateStepThumbnailImage(l.ctx, postInfo.Cover); err != nil {
		logx.Error(err)
		return resp.SetStatusWithMessage(basic.CodeServiceErr, "failed to create step thumbnail image ")
	}
	return resp.SetStatusWithMessage(basic.CodeOK, "success", types.SaveDesignRsp{Sn: postInfo.Sn})
}

// 创建阶梯缩略图
func (l *SaveDesignLogic) CreateStepThumbnailImage(ctx context.Context, coverImage string) error {
	httpRsp, err := http.Get(coverImage)
	if err != nil {
		return err
	}
	defer httpRsp.Body.Close()
	coverImg, _, err := image.Decode(httpRsp.Body)
	if err != nil {
		return err
	}
	coverImgOrgWith := coverImg.Bounds().Dx()
	coverImgOrgHeight := coverImg.Bounds().Dy()
	fileExt := path.Ext(coverImage)
	for _, size := range constants.IMAGE_CROPPING_STEP_SIZE {
		//尺寸大于原图
		if size > coverImgOrgWith {
			continue
		}
		//缩放比例按照宽度来设定
		scale := size / coverImgOrgWith
		height := scale * coverImgOrgHeight
		tmpImage := resize.Resize(uint(size), uint(height), coverImg, resize.Lanczos3)
		fileName := fmt.Sprintf("%s_%d_%s", uuid.New().String(), size, fileExt)
		targetFile, err := os.Create(fileName)
		if err != nil {
			return err
		}
		defer targetFile.Close()
		switch fileExt {
		case ".png":
			err = png.Encode(targetFile, tmpImage)
		case ".jpg", ".jpeg":
			err = jpeg.Encode(targetFile, tmpImage, &jpeg.Options{Quality: 100})
		case ".gif":
			err = gif.Encode(targetFile, tmpImage, nil)
		default:
			err = errors.New("unSupport image format")
		}
		if err != nil {
			return err
		}
	}
	return nil
}