package logging

import (
	"fmt"
	"io"
	"os"
	"path/filepath"
	"time"

	log "github.com/sirupsen/logrus"
)

// SetupLogging ensures the log directory, opens the rotating log writer, and configures logrus.
func SetupLogging(logDir, serviceName, buildVersion string) (io.WriteCloser, error) {
	if err := os.MkdirAll(logDir, 0o755); err != nil {
		return nil, fmt.Errorf("create log directory: %w", err)
	}

	fileName := filepath.Join(logDir, serviceName+".log")
	f, err := newWeeklyLogWriter(fileName, time.Local, defaultWeeklyLogRuntime())
	if err != nil {
		return nil, fmt.Errorf("open log file: %w", err)
	}

	log.SetOutput(f)
	log.SetFormatter(&log.JSONFormatter{
		TimestampFormat: time.RFC3339,
	})
	log.SetLevel(log.InfoLevel)

	log.WithFields(log.Fields{
		"buildVersion": buildVersion,
	}).Info("Logging initialized")

	return f, nil
}