support user custom exchange rates data

pkg/models/exchange_rate.go

@@ -1,6 +1,39 @@
 package models
 
-import "strings"
+import (
+	"strings"
+
+	"github.com/mayswind/ezbookkeeping/pkg/utils"
+)
+
+const UserCustomExchangeRateFactorInDatabase = int64(100000000)
+
+// UserCustomExchangeRate represents user custom exchange rate data
+type UserCustomExchangeRate struct {
+	Uid             int64  `xorm:"PK NOT NULL"`
+	DeletedUnixTime int64  `xorm:"PK NOT NULL"`
+	Currency        string `xorm:"PK VARCHAR(3) NOT NULL"`
+	Rate            int64  `xorm:"NOT NULL"`
+	CreatedUnixTime int64
+	UpdatedUnixTime int64
+}
+
+// UserCustomExchangeRateUpdateRequest represents all parameters of user custom exchange rate data updating request
+type UserCustomExchangeRateUpdateRequest struct {
+	Currency string `json:"currency" binding:"required,len=3,validCurrency"`
+	Rate     string `json:"rate"`
+}
+
+// UserCustomExchangeRateDeleteRequest represents all parameters of user custom exchange rate data deleting request
+type UserCustomExchangeRateDeleteRequest struct {
+	Currency string `json:"currency" binding:"required,len=3,validCurrency"`
+}
+
+// UserCustomExchangeRateUpdateResponse represents a view-object of the result of updating user custom exchange rate data
+type UserCustomExchangeRateUpdateResponse struct {
+	LatestExchangeRate
+	UpdateTime int64 `json:"updateTime"`
+}
 
 // LatestExchangeRateResponse returns a view-object which contains latest exchange rate
 type LatestExchangeRateResponse struct {
@@ -17,6 +50,53 @@ type LatestExchangeRate struct {
 	Rate     string `json:"rate"`
 }
 
+// ToLatestExchangeRate returns a data pair of currency and exchange rate according to database model
+func (r *UserCustomExchangeRate) ToLatestExchangeRate(baseCurrencyRate int64) *LatestExchangeRate {
+	rate := float64(0)
+
+	if baseCurrencyRate > 0 {
+		rate = float64(r.Rate) / float64(baseCurrencyRate)
+	}
+
+	return &LatestExchangeRate{
+		Currency: r.Currency,
+		Rate:     utils.Float64ToString(rate),
+	}
+}
+
+// ToUserCustomExchangeRateUpdateResponse returns a view-object of the result of updating user custom exchange rate data according to database model
+func (r *UserCustomExchangeRate) ToUserCustomExchangeRateUpdateResponse(baseCurrencyRate int64) *UserCustomExchangeRateUpdateResponse {
+	return &UserCustomExchangeRateUpdateResponse{
+		LatestExchangeRate: *r.ToLatestExchangeRate(baseCurrencyRate),
+		UpdateTime:         r.UpdatedUnixTime,
+	}
+}
+
+// CreateUserCustomExchangeRate returns a user custom exchange rate database model according to currency and rate
+func CreateUserCustomExchangeRate(uid int64, currency string, exchangeRate string, baseCurrencyRate int64) (*UserCustomExchangeRate, error) {
+	if baseCurrencyRate <= 0 {
+		return &UserCustomExchangeRate{
+			Uid:      uid,
+			Currency: currency,
+			Rate:     UserCustomExchangeRateFactorInDatabase,
+		}, nil
+	}
+
+	rate, err := utils.StringToFloat64(exchangeRate)
+
+	if err != nil {
+		return nil, err
+	}
+
+	rate = rate * float64(baseCurrencyRate)
+
+	return &UserCustomExchangeRate{
+		Uid:      uid,
+		Currency: currency,
+		Rate:     int64(rate),
+	}, nil
+}
+
 // LatestExchangeRateSlice represents the slice data structure of LatestExchangeRate
 type LatestExchangeRateSlice []*LatestExchangeRate