package apply

import (
	"context"
	"lone-services/pkg/redis"
	"lone-services/pkg/utils"
	"lone-services/services/product/internal/dao"
	"lone-services/services/product/internal/model"
	"lone-services/services/product/internal/wecom"
	"strconv"
	"time"

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

const (
	applyProductEditKey = "apply:edit:product:"
	applyEditTimeOut    = 60 * 24 // 分钟
	applyMd5Key         = "keys:"
)

// Data Redis 中的编辑申请状态
type Data struct {
	Uid    int    `json:"uid"`
	Id     int    `json:"id"`
	Reason string `json:"reason"`
	Status uint8  `json:"status"` // 9待审 1通过 2驳回 0未申请
	Time   string `json:"time"`
	Type   uint8  `json:"type"`
}

func redisKey(uId, objId int) string {
	return applyProductEditKey + strconv.Itoa(uId) + "_" + strconv.Itoa(objId)
}

func md5MapKey(md5 string) string {
	return applyProductEditKey + applyMd5Key + md5
}

// Get 读取申请状态
func Get(ctx context.Context, uId, objId int) (Data, error) {
	var data Data
	if redis.Client == nil {
		return data, nil
	}
	result, err := redis.Client.Get(ctx, redisKey(uId, objId)).Result()
	if err == redis.Nil {
		return data, nil
	}
	if err != nil {
		return data, err
	}
	if len(result) < utils.NumberFive {
		return data, nil
	}
	if err = jsoniter.Unmarshal([]byte(result), &data); err != nil {
		return data, err
	}
	return data, nil
}

// Del 删除申请缓存（编辑成功后清除）
func Del(ctx context.Context, uId, objId int) error {
	if redis.Client == nil {
		return nil
	}
	return redis.Client.Del(ctx, redisKey(uId, objId)).Err()
}

// Set 发起编辑申请：写 Redis + action_apply_log，企微消息预留
func Set(ctx context.Context, uId, objId int, reason string) error {
	data := Data{
		Uid:    uId,
		Id:     objId,
		Reason: reason,
		Status: dao.ApplyStatusWaitPass,
		Type:   dao.EditLogTypeProduct,
		Time:   time.Now().Format(time.DateTime),
	}

	md5, err := saveRedis(ctx, &data)
	if err != nil {
		return err
	}

	add := dao.ActionApplyLogCreate{
		AdminId: uId,
		ObjId:   objId,
		Type:    dao.EditLogTypeProduct,
		Reason:  reason,
		Status:  dao.ApplyStatusWaitPass,
	}
	err = model.ActionApplyLogModel{}.Init().Create(&add)
	if err != nil {
		_ = Del(ctx, uId, objId)
		logx.WithContext(ctx).Errorf("action apply log create: %v", err)
		return err
	}

	wecom.NotifyProduct(wecom.NotifyJob{
		ObjId:   objId,
		ObjType: dao.EditLogTypeProduct,
		Type:    wecom.ProductApplyReview,
		Reason:  reason,
		Key:     md5,
	})
	return nil
}

func saveRedis(ctx context.Context, data *Data) (string, error) {
	if redis.Client == nil {
		return "", nil
	}
	key := redisKey(data.Uid, data.Id)
	md5 := utils.MD5Encrypt(strconv.Itoa(data.Uid) + strconv.Itoa(data.Id) + data.Time)
	payload, err := jsoniter.Marshal(data)
	if err != nil {
		return md5, err
	}
	expire := time.Duration(applyEditTimeOut) * time.Minute
	if err = redis.Client.Set(ctx, key, string(payload), expire).Err(); err != nil {
		return md5, err
	}
	if data.Status == dao.ApplyStatusWaitPass {
		if err = redis.Client.Set(ctx, md5MapKey(md5), key, expire).Err(); err != nil {
			return md5, err
		}
	}
	return md5, nil
}

// CanEdit 是否已获编辑权限（申请通过）
func CanEdit(ctx context.Context, uId, objId int) bool {
	data, err := Get(ctx, uId, objId)
	if err != nil {
		logx.WithContext(ctx).Errorf("apply get: %v", err)
		return false
	}
	return data.Status == dao.ApplyStatusDone
}

// Pass 临时：将编辑申请置为通过（企微审批对接后删除）
func Pass(ctx context.Context, uId, objId int) error {
	data, err := Get(ctx, uId, objId)
	if err != nil {
		return err
	}
	if data.Status == dao.ApplyStatusDone {
		return nil
	}
	if data.Status != dao.ApplyStatusWaitPass && data.Status != 0 {
		return errAlreadyHandled
	}

	reason := data.Reason
	if data.Status == 0 {
		data = Data{
			Uid:    uId,
			Id:     objId,
			Reason: "临时通过",
			Type:   dao.EditLogTypeProduct,
			Time:   time.Now().Format(time.DateTime),
		}
		reason = data.Reason
	}
	data.Status = dao.ApplyStatusDone
	if data.Time == "" {
		data.Time = time.Now().Format(time.DateTime)
	}

	if _, err = saveRedis(ctx, &data); err != nil {
		return err
	}

	add := dao.ActionApplyLogCreate{
		AdminId: uId,
		ObjId:   objId,
		Type:    dao.EditLogTypeProduct,
		Reason:  reason,
		Status:  dao.ApplyStatusDone,
	}
	err = model.ActionApplyLogModel{}.Init().Create(&add)
	if err != nil {
		logx.WithContext(ctx).Errorf("action apply log pass: %v", err)
		return err
	}

	wecom.NotifyProduct(wecom.NotifyJob{
		ObjId:   objId,
		ObjType: dao.EditLogTypeProduct,
		Type:    wecom.ProductNeedReview,
		Action:  dao.ApplyStatusDone,
		Reason:  reason,
	})
	return nil
}

// errAlreadyHandled 申请已驳回等不可再通过
var errAlreadyHandled = errApply("申请状态不可通过")

type errApply string

func (e errApply) Error() string { return string(e) }

// IsAlreadyHandled 是否为「状态不可通过」
func IsAlreadyHandled(err error) bool {
	_, ok := err.(errApply)
	return ok
}