package logger

import (
	"fmt"
	"os"
	"path/filepath"
	"strings"

	"backupx/server/internal/config"
	"github.com/natefinch/lumberjack"
	"go.uber.org/zap"
	"go.uber.org/zap/zapcore"
)

func New(cfg config.LogConfig) (*zap.Logger, error) {
	level := parseLevel(cfg.Level)
	encoderCfg := zap.NewProductionEncoderConfig()
	encoderCfg.TimeKey = "time"
	encoderCfg.EncodeTime = zapcore.ISO8601TimeEncoder
	encoder := zapcore.NewJSONEncoder(encoderCfg)

	writers := []zapcore.WriteSyncer{zapcore.AddSync(os.Stdout)}
	if cfg.File != "" {
		if err := os.MkdirAll(filepath.Dir(cfg.File), 0o755); err != nil {
			return nil, fmt.Errorf("create log dir: %w", err)
		}
		rotator := &lumberjack.Logger{
			Filename:   cfg.File,
			MaxSize:    cfg.MaxSize,
			MaxBackups: cfg.MaxBackups,
			MaxAge:     cfg.MaxAge,
			LocalTime:  false,
			Compress:   true,
		}
		writers = append(writers, zapcore.AddSync(rotator))
	}

	core := zapcore.NewCore(encoder, zapcore.NewMultiWriteSyncer(writers...), level)
	return zap.New(core, zap.AddCaller(), zap.AddStacktrace(zapcore.ErrorLevel)), nil
}

func parseLevel(value string) zapcore.Level {
	switch strings.ToLower(strings.TrimSpace(value)) {
	case "debug":
		return zapcore.DebugLevel
	case "warn":
		return zapcore.WarnLevel
	case "error":
		return zapcore.ErrorLevel
	default:
		return zapcore.InfoLevel
	}
}