Challenge 2019: Problem statement 1 solution

main.go

@@ -0,0 +1,123 @@
+package main
+
+import (
+	"encoding/csv"
+	"fmt"
+	"io"
+	"log"
+	"os"
+	"strconv"
+	"strings"
+)
+
+func main() {
+	// open input.csv partnersFile
+	inputFile, err := os.Open("input.csv")
+	if err != nil {
+		log.Fatal(err)
+	}
+	// close inputFile at the end of main
+	defer inputFile.Close()
+
+	// create output.csv file
+	outputFile, err := os.Create("output.csv")
+	if err != nil {
+		log.Fatal(err)
+	}
+	// close output file at the end of main
+	defer outputFile.Close()
+
+	// create a csv writer for output file
+	outputFileWriter := csv.NewWriter(outputFile)
+	// flush writer at the end
+	defer outputFileWriter.Flush()
+
+	// read csv input.csv using a csv.Reader
+	inputFileCsvReader := csv.NewReader(inputFile)
+
+	// iterate over input and partners to minimum cost of delivery
+	for {
+		inputRecord, err := inputFileCsvReader.Read()
+		if err == io.EOF {
+			break
+		} else if err != nil {
+			log.Fatal(err)
+		}
+
+		inputTheaterId := inputRecord[2]
+		deliverySize, err := strconv.Atoi(inputRecord[1])
+		if err != nil {
+			log.Fatal("Error while converting deliverySize string to int: ", err)
+		}
+
+		// open partners.csv partnersFile
+		partnersFile, err := os.Open("partners.csv")
+		if err != nil {
+			log.Fatal(err)
+		}
+		// read csv partner.csv using a csv.Reader
+		partnerFileCsvReader := csv.NewReader(partnersFile)
+
+		//skip first record
+		if _, err := partnerFileCsvReader.Read(); err != nil {
+			fmt.Println("Error reading first line of partner.csv: ", err)
+		}
+
+		minDeliveryCost := 0
+		isDeliveryPossible := false
+		deliveryPartner := ""
+
+		var outputRecord []string
+
+		// write deliveryId to output
+		outputRecord = append(outputRecord, inputRecord[0])
+
+		for {
+			partnerRecord, err := partnerFileCsvReader.Read()
+			if err == io.EOF {
+				break
+			} else if err != nil {
+				log.Fatal(err)
+			}
+
+			sizeSlab := strings.Split(partnerRecord[1], "-")
+			sizeSlabMin, err := strconv.Atoi(strings.TrimSpace(sizeSlab[0]))
+			if err != nil {
+				log.Fatal(err)
+			}
+			sizeSlabMax, err := strconv.Atoi(strings.TrimSpace(sizeSlab[1]))
+			if err != nil {
+				log.Fatal(err)
+			}
+
+			if inputTheaterId == strings.TrimSpace(partnerRecord[0]) && (deliverySize >= sizeSlabMin && deliverySize <= sizeSlabMax) {
+				isDeliveryPossible = true
+				rate, err := strconv.Atoi(strings.TrimSpace(partnerRecord[3]))
+				if err != nil {
+					log.Fatal(err)
+				}
+				deliveryCost := deliverySize * rate
+				minCost, err := strconv.Atoi(strings.TrimSpace(partnerRecord[2]))
+				if err != nil {
+					log.Fatal(err)
+				}
+				if deliveryCost < minCost {
+					deliveryCost = minCost
+				}
+				if minDeliveryCost == 0 || deliveryCost < minDeliveryCost {
+					minDeliveryCost = deliveryCost
+					deliveryPartner = partnerRecord[4]
+				}
+			}
+		}
+		if !isDeliveryPossible {
+			outputRecord = append(outputRecord, fmt.Sprintf("%t", isDeliveryPossible))
+			outputRecord = append(outputRecord, "")
+			outputRecord = append(outputRecord, "")
+		} else {
+			outputRecord = append(outputRecord, fmt.Sprintf("%t", isDeliveryPossible), deliveryPartner, fmt.Sprintf("%d", minDeliveryCost))
+		}
+		partnersFile.Close()
+		outputFileWriter.Write(outputRecord)
+	}
+}

output.csv

@@ -0,0 +1,4 @@
+D1,true,P1,2000
+D2,true,P1,3250
+D3,true,P3,15300
+D4,false,,