package router_test

import (
	"encoding/json"
	"fmt"
	"net/http"
	"net/http/httptest"
	"strings"
	"sync"
	"sync/atomic"
	"testing"

	"galaxy/model/rest"

	"github.com/gin-gonic/gin"
	"github.com/iliadenisov/galaxy/server/internal/router"
	"github.com/stretchr/testify/assert"
)

func TestLimitConnections(t *testing.T) {
	r := limitTestingRouter()

	wg := sync.WaitGroup{}
	lock := sync.WaitGroup{}
	lock.Add(1)
	for range 1000 {
		wg.Go(func() {
			w := httptest.NewRecorder()
			lock.Wait()
			req, _ := http.NewRequest("GET", "/limited", nil)
			r.ServeHTTP(w, req)
			assert.Equal(t, 200, w.Code, w.Body)
		})
	}
	lock.Done()
	wg.Wait()
}

func asBody(body any) *strings.Reader {
	commandJson, _ := json.Marshal(body)
	return strings.NewReader(string(commandJson))
}

func limitTestingRouter() *gin.Engine {
	gin.SetMode(gin.ReleaseMode)
	r := gin.New()
	r.Use(gin.Recovery())

	counter := atomic.Int32{}
	r.GET("/limited",
		// limiting all ingoing connections
		router.LimitMiddleware(1),
		// storing counter value and testing increment after executing Next handlers
		func(c *gin.Context) {
			expected := counter.Load() + 1
			c.Next()
			current := counter.Load()
			if current != expected {
				c.String(http.StatusConflict, "expected: %d, got: %d", expected, current)
			}
		},
		// increment counter
		func(c *gin.Context) {
			counter.Add(1)
			c.Status(http.StatusOK)
		})
	return r
}

func generateInitRequest(races int) rest.Init {
	request := rest.Init{
		Races: make([]rest.Race, races),
	}
	for i := range request.Races {
		request.Races[i] = rest.Race{Name: raceName(i)}
	}
	return request
}

func raceName(i int) string {
	return fmt.Sprintf("Race_%02d", i)
}