package template

import (
	"encoding/json"
	"time"
)

func JSONEscape(v interface{}) string {
	b, err := json.Marshal(v)
	if err != nil {
		return ""
	}
	return string(b)
}

func TimeCurrent() int64 {
	return time.Now().Unix()
}

func Chain(handlers ...CommandFunc) CommandFunc {
	n := len(handlers)

	if n == 0 {
		return func(data interface{}, opt *Option, handler HandlerFunc) error {
			return handler(data, opt)
		}
	}
	if n == 1 {
		return handlers[0]
	}
	last := n - 1
	return func(data interface{}, opt *Option, handler HandlerFunc) error {

		var (
			chain HandlerFunc
			cur   int
		)
		chain = func(data interface{}, opt *Option) error {
			if cur == last {
				return handler(data, opt)
			}
			cur++
			err := handlers[cur](data, opt, chain)
			cur--
			return err
		}
		return handlers[0](data, opt, chain)
	}
}