package ssh

import (
	"fmt"
	"regexp"
	"strings"
)

var builtInRegExps = map[string]*regexp.Regexp{
	"webUrl":   regexp.MustCompile(`(?m)https?:\/\/(?:www\.)?[-a-zA-Z0-9@:%._\+~#=]{1,256}\.[a-zA-Z0-9()]{1,6}\b(?:[-a-zA-Z0-9()@:%_\+.~#?&\/=]*)`),
	"httpUrl":  regexp.MustCompile(`(?m)http:\/\/(?:www\.)?[-a-zA-Z0-9@:%._\+~#=]{1,256}\.[a-zA-Z0-9()]{1,6}\b(?:[-a-zA-Z0-9()@:%_\+.~#?&\/=]*)`),
	"httpsUrl": regexp.MustCompile(`(?m)https:\/\/(?:www\.)?[-a-zA-Z0-9@:%._\+~#=]{1,256}\.[a-zA-Z0-9()]{1,6}\b(?:[-a-zA-Z0-9()@:%_\+.~#?&\/=]*)`),
}

func makeDomainCatchRegExp(expr string) (*regexp.Regexp, error) {
	if expr == "" {
		return nil, nil
	}
	if strings.HasPrefix(expr, "!") {
		exprName := expr[1:]
		builtIn, found := builtInRegExps[exprName]
		if !found {
			return nil, fmt.Errorf("no builtin regexp with name '%s'", exprName)
		}
		return builtIn, nil
	}
	return regexp.Compile(expr)
}