package logjson

import (
	"io"
	"os"
	"time"

	"git.blauwelle.com/go/crate/synchelper"
)

// Option 配置日志处理对象
type Option interface {
	apply(cfg *config)
}

// WithBufferPool 配置缓冲池
func WithBufferPool(pool synchelper.BytesBufferPool) Option {
	return optionFunc(func(cfg *config) {
		cfg.pool = pool
	})
}

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

// WithTimeFormat 配置时间格式
func WithTimeFormat(format string) Option {
	return optionFunc(func(cfg *config) {
		cfg.timestampFormat = format
	})
}

// WithDisableTime 配置仅用时间输出
func WithDisableTime(disable bool) Option {
	return optionFunc(func(cfg *config) {
		cfg.disableTime = disable
	})
}

// WithDisableHTMLEscape 配置禁止 HTML 转义
func WithDisableHTMLEscape(disable bool) Option {
	return optionFunc(func(cfg *config) {
		cfg.disableHTMLEscape = disable
	})
}

// WithPrettyPrint 配置 JSON 多行缩进输出
func WithPrettyPrint(pretty bool) Option {
	return optionFunc(func(cfg *config) {
		cfg.prettyPrint = pretty
	})
}

func newConfig(opts ...Option) *config {
	cfg := defaultConfig()
	for _, opt := range opts {
		opt.apply(cfg)
	}
	if !cfg.hasPool {
		cfg.pool = synchelper.NewBytesBufferPool(512, 4096)
	}
	if cfg.output == nil {
		cfg.output = synchelper.NewSyncWriter(os.Stderr)
	}
	if cfg.timestampFormat == "" {
		cfg.timestampFormat = time.RFC3339Nano
	}
	return cfg
}

func defaultConfig() *config {
	return &config{
		hasPool:           false,
		disableTime:       false,
		disableHTMLEscape: false,
		prettyPrint:       false,
	}
}

type config struct {
	pool              synchelper.BytesBufferPool
	output            io.Writer
	timestampFormat   string
	hasPool           bool
	disableTime       bool
	disableHTMLEscape bool
	prettyPrint       bool
}

type optionFunc func(cfg *config)

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