package logger

import (
	"context"
	"io"
	"os"
)

// Option func
type Option func(*Options)

// Options holds logger options
type Options struct {
	// The logging level the logger should log at. default is `InfoLevel`
	Level Level
	// fields to always be logged
	Fields map[string]interface{}
	// It's common to set this to a file, or leave it default which is `os.Stderr`
	Out io.Writer
	// Caller skip frame count for file:line info
	CallerSkipCount int
	// Alternative options
	Context context.Context
}

// NewOptions creates new options struct
func NewOptions(opts ...Option) Options {
	options := Options{
		Level:           InfoLevel,
		Fields:          make(map[string]interface{}),
		Out:             os.Stderr,
		CallerSkipCount: 2,
		Context:         context.Background(),
	}
	for _, o := range opts {
		o(&options)
	}
	return options
}

// WithFields set default fields for the logger
func WithFields(fields map[string]interface{}) Option {
	return func(args *Options) {
		args.Fields = fields
	}
}

// WithLevel set default level for the logger
func WithLevel(level Level) Option {
	return func(args *Options) {
		args.Level = level
	}
}

// WithOutput set default output writer for the logger
func WithOutput(out io.Writer) Option {
	return func(args *Options) {
		args.Out = out
	}
}

// WithCallerSkipCount set frame count to skip
func WithCallerSkipCount(c int) Option {
	return func(args *Options) {
		args.CallerSkipCount = c
	}
}

// WithContext set context
func WithContext(ctx context.Context) Option {
	return func(args *Options) {
		args.Context = ctx
	}
}