package logtext

import (
	"io"
	"time"

	"git.blauwelle.com/go/crate/log/logsdk/logjson"
)

type Option interface {
	apply(cfg *config)
}

func WithBufferPool(pool logjson.BytesBufferPool) Option {
	return optionFunc(func(cfg *config) {
		cfg.bytesBufferPool = pool
	})
}

func WithOutput(w io.Writer) Option {
	return optionFunc(func(cfg *config) {
		cfg.output = w
	})
}

func WithTimeFormat(format string) Option {
	return optionFunc(func(cfg *config) {
		cfg.timeFormat = format
		cfg.timePadding = len(format)
	})
}

func WithDisableTime(disable bool) Option {
	return optionFunc(func(cfg *config) {
		cfg.disableTime = disable
	})
}

type config struct {
	bytesBufferPool logjson.BytesBufferPool
	output          io.Writer
	timeFormat      string
	timePadding     int
	disableTime     bool
}

func newConfig(opts ...Option) *config {
	cfg := new(config)
	for _, opt := range opts {
		opt.apply(cfg)
	}
	if cfg.bytesBufferPool == nil {
		cfg.bytesBufferPool = logjson.DefaultBytesBufferPool
	}
	if cfg.output == nil {
		cfg.output = logjson.DefaultStderrSyncWriter
	}
	if cfg.timeFormat == "" {
		cfg.timeFormat = time.RFC3339Nano
		cfg.timePadding = len(cfg.timeFormat)
	}
	return cfg
}

type optionFunc func(cfg *config)

func (fn optionFunc) apply(cfg *config) {
	fn(cfg)
}