return price on api call, price hardcoded

server.go

@@ -2,14 +2,13 @@ package main
 
 import (
 	"fmt"
+	"github.com/PuerkitoBio/goquery"
+	"github.com/benbjohnson/phantomjs"
 	"log"
+	"math"
 	"net/http"
 	"strconv"
 	"strings"
-	//"gopkg.in/headzoo/surf.v1"
-	"github.com/PuerkitoBio/goquery"
-	//"sourcegraph.com/sourcegraph/go-selenium"
-	"github.com/benbjohnson/phantomjs"
 )
 
 const validNumberOfURLParams = 5
@@ -18,6 +17,15 @@ const countParamIndex = 4
 const validNumberOfSizeParams = 2
 
 const maxExpectedNumberOfQuantities = 15
+const numberOfTabsToSizeGroup = 12
+const numberOfArrowDownToCustomSize = 4
+
+const validMinWidth = 25.4
+const validMaxWidth = 914.4
+const validMinHeight = 25.4
+const validMaxHeigh = 609.59
+
+const epsilon = 0.1
 
 const stickerMuleURL = "https://www.stickermule.com/uk/products/die-cut-stickers"
 
@@ -26,15 +34,19 @@ const (
 	invalidNumberOfParamsError    = "Number of params not correct, expected /WIDTHxLENGTH/count"
 	invalidNumberOfSizeParamError = "Size not correct, expected /WIDTHxLENGTH/count"
 	invalidParamsType             = "Params should be numbers"
+	invalidParamsSize             = "Params should be in range"
+
+	errorSimulatingInput = "Error with simulating user input"
 
 	tooManyQuantities = "Too many quantities. Didn't expect this"
+
+	failedToGetPrice = "Failed to get price"
 )
 
 var listOfValidQuantities []int16
 var stickerMuleWebPage *phantomjs.WebPage
 var stickerMuleWebPageDocument *goquery.Document
 
-
 func getListOfQuantities() error {
 	result := make([]int16, maxExpectedNumberOfQuantities)
 	resultCount := 0
@@ -48,7 +60,6 @@ func getListOfQuantities() error {
 		numberWithoutComma := strings.Replace(s.Text(), ",", "", -1)
 		trimmedNumber := strings.TrimSpace(numberWithoutComma)
 
-
 		if sizeInt64, err := strconv.ParseInt(trimmedNumber, 10, 16); err != nil {
 			wasError = true
 			whichError = err
@@ -70,6 +81,80 @@ func getListOfQuantities() error {
 	return nil
 }
 
+func floatToString(number float64) string {
+	return strconv.FormatFloat(number, 'f', 1, 64)
+}
+
+func getStickerPrice(width, height float64, quantity int) (int, error) {
+
+	//simulate click on "Custom size radio button"
+	if _, err := stickerMuleWebPage.Evaluate("function(){document.getElementById('variant_77').click();}"); err != nil {
+		return 0, err
+	}
+
+	//set value for width
+	if _, err := stickerMuleWebPage.Evaluate("function(){document.getElementById('width').value = " + floatToString(width) + ";}"); err != nil {
+		return 0, err
+	}
+
+	//set value for height
+	if _, err := stickerMuleWebPage.Evaluate("function(){document.getElementById('height').value = " + floatToString(height) + ";}"); err != nil {
+		return 0, err
+	}
+
+	//check if input boxes accepted passed values
+	valuesFromInputBoxes, err := stickerMuleWebPage.Evaluate("function(){return {width: document.getElementById('width').value, height: document.getElementById('height').value};}")
+	if err != nil {
+		return 0, err
+	}
+
+	valuesMap, ok := valuesFromInputBoxes.(map[string]interface{})
+	if !ok {
+		return 0, fmt.Errorf(invalidParamsType)
+	}
+
+	redWidthString, ok := valuesMap["width"].(string)
+	if !ok {
+		return 0, fmt.Errorf(invalidParamsType)
+	}
+
+	redHeightString, ok := valuesMap["height"].(string)
+	if !ok {
+		return 0, fmt.Errorf(invalidParamsType)
+	}
+
+	widthValue, err := strconv.ParseFloat(redWidthString, 64)
+	if err != nil {
+		return 0, fmt.Errorf(invalidParamsType)
+	}
+
+	heightValue, err := strconv.ParseFloat(redHeightString, 64)
+	if err != nil {
+		return 0, fmt.Errorf(invalidParamsType)
+	}
+
+	if math.Abs(widthValue-width) > epsilon || math.Abs(heightValue-height) > epsilon {
+		return 0, fmt.Errorf(invalidParamsType)
+	}
+
+	//Now read price for selected quantity
+	priceValue, err := stickerMuleWebPage.Evaluate("function(){return {price: document.getElementById('price_200_id').innerHTML};}")
+	//TODO : price is empty because setting value for width and height doesn't fire event listener
+	//on input fields and prices are not loaded. Find another way to simulate user input
+
+	priceMap, ok := priceValue.(map[string]interface{})
+	if !ok {
+		return 0, fmt.Errorf(failedToGetPrice)
+	}
+
+	_, ok = priceMap["price"].(string)
+	if !ok {
+		return 0, fmt.Errorf(failedToGetPrice)
+	}
+
+	return 100, nil
+}
+
 func errorResponse(w http.ResponseWriter, errType string) {
 	fmt.Fprintf(w, errType)
 }
@@ -79,26 +164,34 @@ func diecutHandler(w http.ResponseWriter, r *http.Request) {
 		if size := strings.Split(params[sizeParamIndex], "x"); len(size) == validNumberOfSizeParams {
 			count := params[countParamIndex]
 
-			width, wOk := strconv.ParseInt(size[0], 10, 16)
-			height, hOk := strconv.ParseInt(size[1], 10, 16)
+			width, wOk := strconv.ParseFloat(size[0], 64)
+			height, hOk := strconv.ParseFloat(size[1], 64)
 			countNumber, cOk := strconv.ParseInt(count, 10, 16)
 
 			countNumber16 := int16(countNumber)
 
 			foundValidQuantity := false
-			for _, value := range(listOfValidQuantities){
+			for _, value := range listOfValidQuantities {
 				if value == countNumber16 {
 					foundValidQuantity = true
 					break
 				}
 			}
 
-			if wOk != nil || hOk != nil || cOk != nil || !foundValidQuantity {
+			validWidth := width >= validMinWidth && width <= validMaxWidth
+			validHeight := height >= validMinHeight && height <= validMaxHeigh
+
+			if wOk != nil || hOk != nil || cOk != nil || !foundValidQuantity || !validWidth || !validHeight {
 				errorResponse(w, invalidParamsType)
 			} else {
 
-				fmt.Fprintf(w, "%dx%d | %d", width, height, countNumber)
-
+				price, err := getStickerPrice(width, height, int(countNumber))
+				if err != nil {
+					errorResponse(w, failedToGetPrice)
+				} else {
+					w.Header().Set("Content-Type", "application/json")
+					fmt.Fprintf(w, "{price:%d, currency: \"USD\"}", price)
+				}
 			}
 
 		} else {
@@ -116,11 +209,14 @@ func defaultHandler(w http.ResponseWriter, r *http.Request) {
 func initWebPage() error {
 	p := phantomjs.DefaultProcess
 
-	stickerMuleWebPage, err := p.CreateWebPage()
+	localStickerMuleWebPage, err := p.CreateWebPage()
 	if err != nil {
 		return err
 	}
 
+	//keep pointer to web page in global space, so page is not re-created every time API is called
+	stickerMuleWebPage = localStickerMuleWebPage
+
 	// Open a URL.
 	if err := stickerMuleWebPage.Open(stickerMuleURL); err != nil {
 		return err
@@ -171,5 +267,4 @@ func main() {
 	fmt.Println("Server running on localhost:8080")
 	log.Fatal(http.ListenAndServe(":8080", nil))
 
-	
 }