package pipeline

import (
	"context"
	"io"
	"net"
	"net/http"
	"net/http/httptest"
	"sync/atomic"
	"testing"
)

func TestPipelineClientReusesSeparateCDNPool(t *testing.T) {
	t.Setenv("EVOBGP_CDN_ALLOW_PRIVATE", "1")
	var connections atomic.Int32
	server := httptest.NewUnstartedServer(http.HandlerFunc(func(w http.ResponseWriter, _ *http.Request) { _, _ = io.WriteString(w, "192.0.2.0/24\n") }))
	server.Config.ConnState = func(_ net.Conn, state http.ConnState) {
		if state == http.StateNew {
			connections.Add(1)
		}
	}
	server.StartTLS()
	defer server.Close()
	client := NewPipelineHTTPClient()
	defer client.CloseIdleConnections()
	// Configure only test trust roots; the normal dial/redirect guards remain.
	pools := client.Transport.(*pipelineTransport)
	pools.cdn.(*cdnRoundTripper).transport.TLSClientConfig = server.Client().Transport.(*http.Transport).TLSClientConfig.Clone()
	for range 3 {
		req, _ := http.NewRequest(http.MethodGet, server.URL, nil)
		response, err := UpstreamHTTPDo(context.Background(), client, req)
		if err != nil {
			t.Fatal(err)
		}
		_, err = ReadCDNBody(response.Body)
		_ = response.Body.Close()
		if err != nil {
			t.Fatal(err)
		}
	}
	if connections.Load() != 1 {
		t.Fatalf("CDN requests created %d connections", connections.Load())
	}
}

func TestPipelineClientSeparatesPrivateProfileAndCDN(t *testing.T) {
	t.Setenv("EVOBGP_CDN_ALLOW_PRIVATE", "0")
	var calls atomic.Int32
	server := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, _ *http.Request) { calls.Add(1); _, _ = io.WriteString(w, "ok") }))
	defer server.Close()
	client := NewPipelineHTTPClient()
	defer client.CloseIdleConnections()
	response, err := client.Get(server.URL)
	if err != nil {
		t.Fatal(err)
	}
	_, _ = io.Copy(io.Discard, response.Body)
	_ = response.Body.Close()
	req, _ := http.NewRequest(http.MethodGet, server.URL, nil)
	if _, err = UpstreamHTTPDo(context.Background(), client, req); err == nil {
		t.Fatal("CDN used trusted profile pool")
	}
	if calls.Load() != 1 {
		t.Fatalf("CDN reached private profile server: %d", calls.Load())
	}
}