package inbound

import (
	"io"
	"net"
	"net/http"
	"strings"
	"testing"
)

func TestNewAPIHTTPClientMatchesBoundedSubmitConcurrency(t *testing.T) {
	client := NewAPIHTTPClient(48)
	transport, ok := client.Transport.(*http.Transport)
	if !ok {
		t.Fatalf("expected *http.Transport, got %T", client.Transport)
	}
	if transport.MaxConnsPerHost != 48 || transport.MaxIdleConnsPerHost != 48 {
		t.Fatalf("unexpected host connection bounds: max=%d idle=%d", transport.MaxConnsPerHost, transport.MaxIdleConnsPerHost)
	}
	if client.Timeout != defaultHTTPTimeout {
		t.Fatalf("unexpected client timeout: %s", client.Timeout)
	}
}

func TestNewAPIHTTPClientUsesSafeDefault(t *testing.T) {
	client := NewAPIHTTPClient(0)
	transport := client.Transport.(*http.Transport)
	if transport.MaxConnsPerHost != 64 {
		t.Fatalf("expected default max connections 64, got %d", transport.MaxConnsPerHost)
	}
}

func TestSubmitUsesDedicatedHTTPClient(t *testing.T) {
	background := &http.Client{Transport: roundTripFunc(func(*http.Request) (*http.Response, error) {
		t.Fatal("background client must not carry inbound Submit")
		return nil, nil
	})}
	submit := &http.Client{Transport: roundTripFunc(func(request *http.Request) (*http.Response, error) {
		if request.URL.Path != "/api/gateway/events/inbound/submit" {
			t.Fatalf("unexpected submit path %s", request.URL.Path)
		}
		return &http.Response{
			StatusCode: http.StatusCreated,
			Status:     "201 Created",
			Header:     make(http.Header),
			Body:       io.NopCloser(strings.NewReader(`{"accepted":true,"messageId":"MSG-1"}`)),
		}, nil
	})}
	server := Server{APIBaseURL: "http://api.test/api", HTTPClient: background, SubmitHTTPClient: submit}
	result, err := server.submit(&net.TCPAddr{IP: net.ParseIP("127.0.0.1"), Port: 12000}, submitRequest{Account: "test"})
	if err != nil || !result.Accepted {
		t.Fatalf("expected dedicated submit success, result=%+v err=%v", result, err)
	}
}

type roundTripFunc func(*http.Request) (*http.Response, error)

func (fn roundTripFunc) RoundTrip(request *http.Request) (*http.Response, error) {
	return fn(request)
}