package session

import (
	"encoding/json"
	"fmt"
	"regexp"
	"strconv"

	"github.com/evilsocket/islazy/tui"
)

const IPv4Validator = `^(?:[0-9]{1,3}\.){3}[0-9]{1,3}$`

type ModuleHandler struct {
	Name        string
	Description string
	Parser      *regexp.Regexp
	Exec        func(args []string) error
}

func NewModuleHandler(name string, expr string, desc string, exec func(args []string) error) ModuleHandler {
	h := ModuleHandler{
		Name:        name,
		Description: desc,
		Parser:      nil,
		Exec:        exec,
	}

	if expr != "" {
		h.Parser = regexp.MustCompile(expr)
	}

	return h
}

func (h *ModuleHandler) Help(padding int) string {
	return fmt.Sprintf("  "+tui.Bold("%"+strconv.Itoa(padding)+"s")+" : %s\n", h.Name, h.Description)
}

func (h *ModuleHandler) Parse(line string) (bool, []string) {
	if h.Parser == nil {
		if line == h.Name {
			return true, nil
		}
		return false, nil
	}
	result := h.Parser.FindStringSubmatch(line)
	if len(result) == h.Parser.NumSubexp()+1 {
		return true, result[1:]
	}
	return false, nil
}

type JSONModuleHandler struct {
	Name        string `json:"name"`
	Description string `json:"description"`
	Parser      string `json:"parser"`
}

func (h ModuleHandler) MarshalJSON() ([]byte, error) {
	j := JSONModuleHandler{
		Name:        h.Name,
		Description: h.Description,
	}
	if h.Parser != nil {
		j.Parser = h.Parser.String()
	}
	return json.Marshal(j)
}