func productsHandler(api *apidb.Api) func(w http.ResponseWriter, r *http.Request) {
return func(w http.ResponseWriter, r *http.Request) {
setHeaders(w, r)
path := r.URL.Path
path_arr := strings.Split(path, "/")
if len(path_arr) == 3 {
js, err := json.Marshal(api.GetAllProducts())
if err != nil {
http.Error(w, err.Error(), http.StatusInternalServerError)
return
}
w.Header().Set("Content-Type", "application/json")
w.Write(js)
} else {
category := strings.ToLower(path_arr[2])
var sub_category string
if len(path_arr) == 5 {
sub_category = strings.ToLower(path_arr[3])
}
allProducts := api.GetAllProducts()
requestedProducts := make(map[int64]map[int64]map[string][]float64)
for _, product := range allProducts {
if strings.ToLower(product.Category) == category {
if sub_category == "" || strings.ToLower(product.Sub_category) == sub_category {
requestedProducts[product.Id] = make(map[int64]map[string][]float64)
}
}
}
if len(requestedProducts) == 0 {
http.Error(w, fmt.Sprintf("found no products matching: '%[1] %[2]'", category, sub_category), 400)
return
}
allPurchases := api.GetAllPurchases()
allReceipts := api.GetAllReceipts()
for _, purchase := range allPurchases {
product_id := purchase.Product_id
unitCostsByStore, ok := requestedProducts[product_id]
if ok {
var receipt apidb.Receipt
for _, receiptItr := range allReceipts {
if receiptItr.Id == purchase.Receipt_id {
receipt = receiptItr
}
}
if unitCostsByStore[receipt.Store_id] == nil {
unitCostsByStore[receipt.Store_id] = make(map[string][]float64)
}
unitCost := unitCostsByStore[receipt.Store_id][purchase.Unit]
unitCost = append(unitCost, float64(purchase.Cost)/float64(purchase.Quantity))
requestedProducts[product_id][receipt.Store_id][purchase.Unit] = unitCost
}
}
costedProducts := make(map[string]map[string]map[string]float64)
for product_id, unitCostsByStore := range requestedProducts {
costedProducts[strconv.FormatInt(product_id, 10)] = make(map[string]map[string]float64)
for store_id, unitCosts := range unitCostsByStore {
costedProducts[strconv.FormatInt(product_id, 10)][strconv.FormatInt(store_id, 10)] = make(map[string]float64)
for unit, costs := range unitCosts {
var averagedCost float64 = 0
for _, cost := range costs {
averagedCost += cost
}
averagedCost = averagedCost / float64(len(costs))
costedProducts[strconv.FormatInt(product_id, 10)][strconv.FormatInt(store_id, 10)][unit] = averagedCost
}
}
}
js, err := json.Marshal(costedProducts)
if err != nil {
http.Error(w, err.Error(), http.StatusInternalServerError)
return
}
w.Header().Set("Content-Type", "application/json")
w.Write(js)
}
}
}
func purchasesHandler(api *apidb.Api) func(w http.ResponseWriter, r *http.Request) {
return func(w http.ResponseWriter, r *http.Request) {
setHeaders(w, r)
vars := mux.Vars(r)
productId, err := strconv.ParseInt(vars["productId"], 10, 64)
storeId, err := strconv.ParseInt(vars["storeId"], 10, 64)
if err != nil {
http.Error(w, err.Error(), http.StatusInternalServerError)
return
}
stores := api.GetAllStores()
var foundStore apidb.Store
for _, store := range stores {
if store.Id == storeId {
foundStore = store
break
}
}
products := api.GetAllProducts()
var foundProduct apidb.Product
for _, product := range products {
if product.Id == productId {
foundProduct = product
break
}
}
if foundStore.Id != storeId || foundProduct.Id != productId {
http.Error(w, "cannot find store or product", http.StatusInternalServerError)
return
}
receipts := api.GetAllReceipts()
var foundReceipts []apidb.Receipt = make([]apidb.Receipt, 0)
for _, receipt := range receipts {
if receipt.Store_id == foundStore.Id {
foundReceipts = append(foundReceipts, receipt)
}
}
purchases := api.GetAllPurchases()
var foundPurchases []apidb.Purchase = make([]apidb.Purchase, 0)
for _, purchase := range purchases {
if purchase.Product_id == foundProduct.Id {
for _, receipt := range foundReceipts {
if purchase.Receipt_id == receipt.Id {
foundPurchases = append(foundPurchases, purchase)
break
}
}
}
}
w.Header().Set("Content-Type", "application/json")
js, err := json.Marshal(foundPurchases)
if err != nil {
http.Error(w, err.Error(), http.StatusInternalServerError)
return
}
w.Write(js)
}
}