package clog

import (
	"io"
	"os"
)

type Option func(*options)

// To allows setting the logging destination writer, defaults to `os.Stderr` if
// not provided
func To(dest io.Writer) Option {
	return func(o *options) {
		o.dest = dest
	}
}

// WithLevel sets the verbosity level (V-level) for the created logr.Logger
func WithLevel(lvl int) Option {
	return func(o *options) {
		o.lvl = lvl
	}
}

// WithCaller configures which [MessageClass] logs get caller information.
func WithCaller(c MessageClass) Option {
	return func(o *options) {
		o.logCaller = c
	}
}

// private options struct, can only be changed by consumers via the public
// Option function interface
type options struct {
	dest      io.Writer
	lvl       int
	logCaller MessageClass
}

func makeOptions(opts ...Option) options {
	o := options{dest: os.Stderr, logCaller: Error}
	for _, opt := range opts {
		opt(&o)
	}

	return o
}