// Package subdomaincenter logic
package subdomaincenter

import (
	"context"
	"fmt"
	"time"

	jsoniter "github.com/json-iterator/go"

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

// Source is the passive scraping agent
type Source struct {
	timeTaken time.Duration
	errors    int
	results   int
}

// Run function returns all subdomains found with the service
func (s *Source) Run(ctx context.Context, domain string, session *subscraping.Session) <-chan subscraping.Result {
	results := make(chan subscraping.Result)
	s.errors = 0
	s.results = 0

	go func() {
		defer func(startTime time.Time) {
			s.timeTaken = time.Since(startTime)
			close(results)
		}(time.Now())

		resp, err := session.SimpleGet(ctx, fmt.Sprintf("https://api.subdomain.center/?domain=%s", domain))
		if err != nil {
			results <- subscraping.Result{Source: s.Name(), Type: subscraping.Error, Error: err}
			s.errors++
			session.DiscardHTTPResponse(resp)
			return
		}

		var subdomains []string
		err = jsoniter.NewDecoder(resp.Body).Decode(&subdomains)
		if err != nil {
			results <- subscraping.Result{Source: s.Name(), Type: subscraping.Error, Error: err}
			s.errors++
			resp.Body.Close()
			return
		}
		resp.Body.Close()

		for _, subdomain := range subdomains {
			results <- subscraping.Result{Source: s.Name(), Type: subscraping.Subdomain, Value: subdomain}
			s.results++
		}
	}()

	return results
}

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

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

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

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

func (s *Source) AddApiKeys(_ []string) {
	// no key needed
}

func (s *Source) Statistics() subscraping.Statistics {
	return subscraping.Statistics{
		Errors:    s.errors,
		Results:   s.results,
		TimeTaken: s.timeTaken,
	}
}
