package main

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

func TestOpenOneAndBatchCarryAuthenticationAndCursor(t *testing.T) {
	var requests atomic.Int64
	server := httptest.NewServer(http.HandlerFunc(func(writer http.ResponseWriter, request *http.Request) {
		requests.Add(1)
		if request.Header.Get("Authorization") != "Bearer token-1" || request.Header.Get("Accept") != "text/event-stream" {
			t.Errorf("headers=%v", request.Header)
		}
		if request.URL.Query().Get("resume") == "yes" && request.Header.Get("Last-Event-ID") != "41" {
			t.Errorf("Last-Event-ID=%q", request.Header.Get("Last-Event-ID"))
		}
		writer.Header().Set("Content-Type", "text/event-stream; charset=utf-8")
		_, _ = io.WriteString(writer, "id: 42\nevent: heartbeat\ndata: {}\n\n")
	}))
	defer server.Close()

	item, err := openOne(context.Background(), server.Client(), server.URL+"?resume=yes", "token-1", 41)
	if err != nil || item.cursor != 42 || item.body == nil {
		t.Fatalf("item=%+v err=%v", item, err)
	}
	closeAll([]connection{item})
	items, err := openBatch(context.Background(), server.Client(), server.URL, "token-1", 2, 1000, nil)
	if err != nil || len(items) != 2 || requests.Load() != 3 {
		t.Fatalf("items=%d requests=%d err=%v", len(items), requests.Load(), err)
	}
	if err := waitHealthy(items, time.Millisecond); err != nil {
		t.Fatal(err)
	}
	closeAll(items)
}

func TestSSEValidationFailures(t *testing.T) {
	server := httptest.NewServer(http.HandlerFunc(func(writer http.ResponseWriter, _ *http.Request) {
		writer.WriteHeader(http.StatusUnauthorized)
		_, _ = io.WriteString(writer, "denied")
	}))
	defer server.Close()
	if _, err := openOne(context.Background(), server.Client(), server.URL, "bad", 0); err == nil || !strings.Contains(err.Error(), "unexpected response 401") {
		t.Fatalf("unexpected response error=%v", err)
	}
	if err := waitHealthy(nil, 0); err == nil {
		t.Fatal("empty connection set accepted")
	}
	if err := waitHealthy([]connection{{}}, 0); err == nil || !strings.Contains(err.Error(), "not healthy") {
		t.Fatalf("unhealthy error=%v", err)
	}
	ctx, cancel := context.WithCancel(context.Background())
	cancel()
	if _, err := openBatch(ctx, server.Client(), server.URL, "token", 2, 1, nil); err == nil {
		t.Fatal("cancelled batch unexpectedly succeeded")
	}
}