package sources

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

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

const yandexXMLFixture = `<?xml version="1.0" encoding="utf-8"?>
<yandexsearch>
  <response>
    <results>
      <grouping>
        <group>
          <doc>
            <url>https://pastebin.com/yandex1</url>
          </doc>
        </group>
        <group>
          <doc>
            <url>https://github.com/user/repo/blob/main/secrets.env</url>
          </doc>
          <doc>
            <url>https://example.com/leaked</url>
          </doc>
        </group>
      </grouping>
    </results>
  </response>
</yandexsearch>`

func yandexStubHandler(t *testing.T, calls *int32) http.HandlerFunc {
	t.Helper()
	return func(w http.ResponseWriter, r *http.Request) {
		atomic.AddInt32(calls, 1)
		if !strings.HasPrefix(r.URL.Path, "/search/xml") {
			t.Errorf("unexpected path: %s", r.URL.Path)
		}
		if r.URL.Query().Get("user") != "testuser" {
			t.Errorf("missing user param")
		}
		if r.URL.Query().Get("key") != "testkey" {
			t.Errorf("missing key param")
		}
		w.Header().Set("Content-Type", "application/xml")
		_, _ = w.Write([]byte(yandexXMLFixture))
	}
}

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

	tests := []struct {
		user, key string
		want      bool
	}{
		{"", "", false},
		{"user", "", false},
		{"", "key", false},
		{"user", "key", true},
	}
	for _, tt := range tests {
		s := NewYandexSource(tt.user, tt.key, reg, lim)
		if got := s.Enabled(recon.Config{}); got != tt.want {
			t.Errorf("Enabled(user=%q, key=%q) = %v, want %v", tt.user, tt.key, got, tt.want)
		}
	}
}

func TestYandexSource_SweepEmptyCredsReturnsNil(t *testing.T) {
	reg := syntheticRegistry()
	lim := recon.NewLimiterRegistry()
	s := NewYandexSource("", "", reg, lim)

	out := make(chan recon.Finding, 10)
	if err := s.Sweep(context.Background(), "", out); err != nil {
		t.Fatalf("expected nil, got %v", err)
	}
	close(out)
	if n := countFindings(out); n != 0 {
		t.Fatalf("expected 0 findings, got %d", n)
	}
}

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

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

	s := NewYandexSource("testuser", "testkey", reg, lim)
	s.BaseURL = srv.URL

	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 * 3 URLs in XML = 6 findings
	if len(findings) != 6 {
		t.Fatalf("expected 6 findings, got %d", len(findings))
	}
	for _, f := range findings {
		if f.SourceType != "recon:yandex" {
			t.Errorf("SourceType=%q want recon:yandex", f.SourceType)
		}
	}
	if got := atomic.LoadInt32(&calls); got != 2 {
		t.Errorf("expected 2 calls, got %d", got)
	}
}

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

	s := NewYandexSource("user", "key", reg, lim)
	s.BaseURL = "http://127.0.0.1:1"

	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)
	}
}

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

	srv := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		w.WriteHeader(http.StatusUnauthorized)
		_, _ = w.Write([]byte("bad creds"))
	}))
	defer srv.Close()

	s := NewYandexSource("user", "key", reg, lim)
	s.BaseURL = srv.URL

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