package dnsrepo

import (
	"context"
	"encoding/json"
	"fmt"
	"io"
	"strings"

	"github.com/projectdiscovery/subfinder/v2/pkg/subscraping"
)

// Source is the passive scraping agent
type Source struct {
	apiKeys []string
}

type DnsRepoResponse []struct {
	Domain string
}

func (s *Source) Run(ctx context.Context, domain string, session *subscraping.Session) <-chan subscraping.Result {
	results := make(chan subscraping.Result)

	go func() {
		defer close(results)

		randomApiKey := subscraping.PickRandom(s.apiKeys, s.Name())
		if randomApiKey == "" {
			return
		}
		resp, err := session.SimpleGet(ctx, fmt.Sprintf("https://dnsrepo.noc.org/api/?apikey=%s&search=%s", randomApiKey, domain))
		if err != nil {
			results <- subscraping.Result{Source: s.Name(), Type: subscraping.Error, Error: err}
			session.DiscardHTTPResponse(resp)
			return
		}
		responseData, err := io.ReadAll(resp.Body)
		if err != nil {
			results <- subscraping.Result{Source: s.Name(), Type: subscraping.Error, Error: err}
			session.DiscardHTTPResponse(resp)
			return
		}
		resp.Body.Close()
		var result DnsRepoResponse
		err = json.Unmarshal(responseData, &result)
		if err != nil {
			results <- subscraping.Result{Source: s.Name(), Type: subscraping.Error, Error: err}
			session.DiscardHTTPResponse(resp)
			return
		}
		for _, sub := range result {
			results <- subscraping.Result{Source: s.Name(), Type: subscraping.Subdomain, Value: strings.TrimSuffix(sub.Domain, ".")}
		}

	}()
	return results
}

// Name returns the name of the source
func (s *Source) Name() string {
	return "dnsrepo"
}

func (s *Source) IsDefault() bool {
	return true
}

func (s *Source) HasRecursiveSupport() bool {
	return false
}

func (s *Source) NeedsKey() bool {
	return true
}

func (s *Source) AddApiKeys(keys []string) {
	s.apiKeys = keys
}