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reports.go
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/
reports.go
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package service
import (
"bytes"
"context"
"encoding/csv"
"fmt"
"time"
"github.com/zenorachi/dynamic-user-segmentation/internal/entity"
"github.com/zenorachi/dynamic-user-segmentation/internal/repository"
"github.com/zenorachi/dynamic-user-segmentation/internal/service/storage"
)
type ReportsService struct {
repo repository.Operations
gDriveStorage storage.Provider
}
func NewReports(repo repository.Operations, storage storage.Provider) *ReportsService {
return &ReportsService{
repo: repo,
gDriveStorage: storage,
}
}
func (r *ReportsService) CreateReportFile(ctx context.Context, year, month int, userIDs ...int) ([]byte, error) {
if year < 0 || month < 0 || year > time.Now().Year() || month > 12 {
return nil, entity.ErrInvalidHistoryPeriod
}
operations, err := r.repo.GetOperations(ctx, year, month, userIDs...)
if err != nil {
return nil, err
}
var buffer bytes.Buffer
csvWriter := csv.NewWriter(&buffer)
header := []string{"user-id", "segment-name", "type", "date"}
err = csvWriter.Write(header)
if err != nil {
return nil, err
}
for _, operation := range operations {
row := []string{
fmt.Sprintf("%d", operation.UserID), operation.SegmentName, operation.Type,
operation.Date.Format("2006-01-02 15:04:05"),
}
err := csvWriter.Write(row)
if err != nil {
return nil, err
}
}
csvWriter.Flush()
if err := csvWriter.Error(); err != nil {
return nil, err
}
return buffer.Bytes(), nil
}
func (r *ReportsService) CreateReportLink(ctx context.Context, year, month int, userIDs ...int) (string, error) {
if !r.gDriveStorage.IsAvailable() {
return "", entity.ErrGDriveIsNotAvailable
}
if year < 0 || month < 0 || year > time.Now().Year() || month > 12 {
return "", entity.ErrInvalidHistoryPeriod
}
data, err := r.CreateReportFile(ctx, year, month, userIDs...)
if err != nil {
return "", err
}
url, err := r.gDriveStorage.UploadFile(ctx, storage.FileInput{
Data: data,
Name: fmt.Sprintf("report_%d_%d.csv", year, month),
ContentType: "text/csv",
})
if err != nil {
return "", err
}
return url, nil
}