feat: order get requests

api/utils/consts.go

@@ -0,0 +1,105 @@
+package utils
+
+const PAGE_SIZE = 10
+
+const PAGE_SIZE_STRING = "10"
+
+// order page filters
+const FUTURE_FILTER = 1
+const PAST_FILTER = 2
+const FILLED_FILTER = 4
+const UNFILLED_FILTER = 8
+const DELIVERED_FILTER = 16
+const UNDELIVERED_FILTER = 32
+const PAID_FILTER = 64
+const UNPAID_FILTER = 128
+const ASCEND_DATE_DUE = 256
+
+func GetOrderTableQueryString(filter int64) string {
+	query_string_first_part := `
+	WITH order_bill AS (
+	SELECT
+		orec.id,
+		COALESCE(order_total, 0) AS order_total,
+		COALESCE(order_total - orec.amount_paid, 0) AS balance
+	FROM
+		order_record orec
+		INNER JOIN (
+			SELECT 
+				orec.id,
+				SUM(quantity * price) AS order_total
+			FROM
+				order_record orec
+				LEFT JOIN order_item oi ON oi.order_id = orec.id
+				LEFT JOIN item i ON oi.item_id = i.id
+				LEFT JOIN item_price_history iph ON iph.item_id = i.id
+					AND iph.valid_from <= oi.created_at
+					AND (iph.valid_to IS NULL OR iph.valid_to > oi.created_at)
+			GROUP BY orec.id
+		) totals ON orec.id = totals.id
+	)
+	
+	SELECT
+		orec.id,
+		user_id,
+		orderer,
+		date_due,
+		date_placed,
+		amount_paid,
+		order_total,
+		balance,
+		filled,
+		delivered
+	FROM
+		order_record orec
+		INNER JOIN order_bill ON order_bill.id = orec.id
+	`
+
+	order := "DESC"
+	if filter&ASCEND_DATE_DUE > 0 {
+		order = "ASC"
+	}
+
+	query_string_second_part := `
+		ORDER BY date_due ` + order + ` 
+		OFFSET $1
+		LIMIT $2;
+
+	`
+	filter = filter & ^ASCEND_DATE_DUE
+
+	conditions := ""
+	if filter > 0 {
+		if filter&FUTURE_FILTER > 0 {
+			conditions += "AND date_due > now()\n"
+		}
+		if filter&PAST_FILTER > 0 {
+			conditions += "AND date_due < now()\n"
+		}
+		if filter&FILLED_FILTER > 0 {
+			conditions += "AND filled = TRUE\n"
+		}
+		if filter&UNFILLED_FILTER > 0 {
+			conditions += "AND filled = FALSE\n"
+		}
+		if filter&DELIVERED_FILTER > 0 {
+			conditions += "AND delivered = TRUE\n"
+		}
+		if filter&UNDELIVERED_FILTER > 0 {
+			conditions += "AND delivered = FALSE\n"
+		}
+		if filter&PAID_FILTER > 0 {
+			conditions += "AND paid = TRUE\n"
+		}
+		if filter&UNPAID_FILTER > 0 {
+			conditions += "AND paid = FALSE\n"
+		}
+		if len(conditions) > 0 {
+			conditions = "WHERE " + conditions[4:]
+		}
+	}
+
+	query_string := query_string_first_part + conditions + query_string_second_part
+
+	return query_string
+}