package sources

import (
	"context"
	"encoding/json"
	"errors"
	"net/http"
	"net/http/httptest"
	"sync/atomic"
	"testing"
	"time"

	"github.com/salvacybersec/keyhunter/pkg/recon"
)

func fofaStubHandler(t *testing.T, calls *int32) http.HandlerFunc {
	t.Helper()
	return func(w http.ResponseWriter, r *http.Request) {
		atomic.AddInt32(calls, 1)
		if r.URL.Path != "/api/v1/search/all" {
			t.Errorf("unexpected path: %s", r.URL.Path)
		}
		if got := r.URL.Query().Get("email"); got != "test@example.com" {
			t.Errorf("missing email param: %q", got)
		}
		if got := r.URL.Query().Get("key"); got != "testkey" {
			t.Errorf("missing key param: %q", got)
		}
		body := fofaSearchResponse{
			Results: [][]string{
				{"example.com", "1.2.3.4", "443"},
				{"test.org", "5.6.7.8", "8080"},
			},
			Size: 2,
		}
		w.Header().Set("Content-Type", "application/json")
		_ = json.NewEncoder(w).Encode(body)
	}
}

func TestFOFASource_EnabledRequiresCredentials(t *testing.T) {
	reg := syntheticRegistry()
	lim := recon.NewLimiterRegistry()

	s := &FOFASource{Email: "", APIKey: "", Registry: reg, Limiters: lim}
	if s.Enabled(recon.Config{}) {
		t.Error("expected Enabled=false with empty credentials")
	}
	s = &FOFASource{Email: "a@b.com", APIKey: "", Registry: reg, Limiters: lim}
	if s.Enabled(recon.Config{}) {
		t.Error("expected Enabled=false with empty APIKey")
	}
	s = &FOFASource{Email: "", APIKey: "key", Registry: reg, Limiters: lim}
	if s.Enabled(recon.Config{}) {
		t.Error("expected Enabled=false with empty Email")
	}
	s = &FOFASource{Email: "a@b.com", APIKey: "key", Registry: reg, Limiters: lim}
	if !s.Enabled(recon.Config{}) {
		t.Error("expected Enabled=true with both credentials")
	}
}

func TestFOFASource_SweepEmitsFindings(t *testing.T) {
	reg := syntheticRegistry()
	lim := recon.NewLimiterRegistry()
	_ = lim.For("fofa", 1000, 100)

	var calls int32
	srv := httptest.NewServer(fofaStubHandler(t, &calls))
	defer srv.Close()

	s := &FOFASource{
		Email:    "test@example.com",
		APIKey:   "testkey",
		BaseURL:  srv.URL,
		Registry: reg,
		Limiters: lim,
	}

	out := make(chan recon.Finding, 32)
	ctx, cancel := context.WithTimeout(context.Background(), 5*time.Second)
	defer cancel()

	done := make(chan error, 1)
	go func() { done <- s.Sweep(ctx, "", out); close(out) }()

	var findings []recon.Finding
	for f := range out {
		findings = append(findings, f)
	}
	if err := <-done; err != nil {
		t.Fatalf("Sweep error: %v", err)
	}

	// 2 keywords * 2 results = 4 findings
	if len(findings) != 4 {
		t.Fatalf("expected 4 findings, got %d", len(findings))
	}
	for _, f := range findings {
		if f.SourceType != "recon:fofa" {
			t.Errorf("SourceType=%q want recon:fofa", f.SourceType)
		}
	}
	if got := atomic.LoadInt32(&calls); got != 2 {
		t.Errorf("expected 2 API calls, got %d", got)
	}
}

func TestFOFASource_CtxCancelled(t *testing.T) {
	reg := syntheticRegistry()
	lim := recon.NewLimiterRegistry()
	_ = lim.For("fofa", 1000, 100)

	s := &FOFASource{
		Email:    "a@b.com",
		APIKey:   "key",
		BaseURL:  "http://127.0.0.1:1",
		Registry: reg,
		Limiters: lim,
	}

	ctx, cancel := context.WithCancel(context.Background())
	cancel()

	out := make(chan recon.Finding, 1)
	err := s.Sweep(ctx, "", out)
	if !errors.Is(err, context.Canceled) {
		t.Fatalf("expected context.Canceled, got %v", err)
	}
}