package router

import (
	"fmt"
	"strings"

	"github.com/Dreamacro/clash/rule/geodata/strmatcher"
)

var matcherTypeMap = map[Domain_Type]strmatcher.Type{
	Domain_Plain:  strmatcher.Substr,
	Domain_Regex:  strmatcher.Regex,
	Domain_Domain: strmatcher.Domain,
	Domain_Full:   strmatcher.Full,
}

func domainToMatcher(domain *Domain) (strmatcher.Matcher, error) {
	matcherType, f := matcherTypeMap[domain.Type]
	if !f {
		return nil, fmt.Errorf("unsupported domain type %v", domain.Type)
	}

	matcher, err := matcherType.New(domain.Value)
	if err != nil {
		return nil, fmt.Errorf("failed to create domain matcher, base error: %s", err.Error())
	}

	return matcher, nil
}

type DomainMatcher struct {
	matchers strmatcher.IndexMatcher
}

func NewMphMatcherGroup(domains []*Domain) (*DomainMatcher, error) {
	g := strmatcher.NewMphMatcherGroup()
	for _, d := range domains {
		matcherType, f := matcherTypeMap[d.Type]
		if !f {
			return nil, fmt.Errorf("unsupported domain type %v", d.Type)
		}
		_, err := g.AddPattern(d.Value, matcherType)
		if err != nil {
			return nil, err
		}
	}
	g.Build()
	return &DomainMatcher{
		matchers: g,
	}, nil
}

func NewDomainMatcher(domains []*Domain) (*DomainMatcher, error) {
	g := new(strmatcher.MatcherGroup)
	for _, d := range domains {
		m, err := domainToMatcher(d)
		if err != nil {
			return nil, err
		}
		g.Add(m)
	}

	return &DomainMatcher{
		matchers: g,
	}, nil
}

func (m *DomainMatcher) ApplyDomain(domain string) bool {
	return len(m.matchers.Match(strings.ToLower(domain))) > 0
}