package api

import (
	"encoding/json"
	"fmt"
	"io"
	"net/http"
	"net/http/httptest"
	"net/url"
	"testing"
	"time"

	"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/metrics"
	"github.com/go-chi/chi/v5"
	"github.com/go-chi/chi/v5/middleware"
	"github.com/stretchr/testify/require"
	"go.uber.org/zap/zaptest"
)

func TestRouterUploadPart(t *testing.T) {
	chiRouter := prepareRouter(t)

	w := httptest.NewRecorder()
	r := httptest.NewRequest(http.MethodPut, "/dkirillov/fix-object", nil)
	query := make(url.Values)
	query.Set("uploadId", "some-id")
	query.Set("partNumber", "1")
	r.URL.RawQuery = query.Encode()

	chiRouter.ServeHTTP(w, r)
	resp := readResponse(t, w)
	require.Equal(t, "UploadPart", resp.Method)
}

func TestRouterListMultipartUploads(t *testing.T) {
	chiRouter := prepareRouter(t)

	w := httptest.NewRecorder()
	r := httptest.NewRequest(http.MethodGet, "/test-bucket", nil)
	query := make(url.Values)
	query.Set("uploads", "")
	r.URL.RawQuery = query.Encode()

	chiRouter.ServeHTTP(w, r)
	resp := readResponse(t, w)
	require.Equal(t, "ListMultipartUploads", resp.Method)
}

func TestRouterObjectWithSlashes(t *testing.T) {
	chiRouter := prepareRouter(t)

	bktName, objName := "dkirillov", "/fix/object"
	target := fmt.Sprintf("/%s/%s", bktName, objName)

	w := httptest.NewRecorder()
	r := httptest.NewRequest(http.MethodPut, target, nil)

	chiRouter.ServeHTTP(w, r)
	resp := readResponse(t, w)
	require.Equal(t, "PutObject", resp.Method)
	require.Equal(t, objName, resp.ReqInfo.ObjectName)
}

func TestRouterObjectEscaping(t *testing.T) {
	chiRouter := prepareRouter(t)

	bktName := "dkirillov"

	for _, tc := range []struct {
		name            string
		expectedObjName string
		objName         string
	}{
		{
			name:            "simple",
			expectedObjName: "object",
			objName:         "object",
		},
		{
			name:            "with slashes",
			expectedObjName: "fix/object",
			objName:         "fix/object",
		},
		{
			name:            "with percentage",
			expectedObjName: "fix/object%ac",
			objName:         "fix/object%ac",
		},
		{
			name:            "with percentage escaped",
			expectedObjName: "fix/object%ac",
			objName:         "fix/object%25ac",
		},
	} {
		t.Run(tc.name, func(t *testing.T) {
			target := fmt.Sprintf("/%s/%s", bktName, tc.objName)

			w := httptest.NewRecorder()
			r := httptest.NewRequest(http.MethodPut, target, nil)

			chiRouter.ServeHTTP(w, r)
			resp := readResponse(t, w)
			require.Equal(t, "PutObject", resp.Method)
			require.Equal(t, tc.expectedObjName, resp.ReqInfo.ObjectName)
		})
	}
}

func prepareRouter(t *testing.T) *chi.Mux {
	throttleOps := middleware.ThrottleOpts{
		Limit:          10,
		BacklogTimeout: 30 * time.Second,
	}

	handleMock := &handlerMock{t: t}
	cntrMock := &centerMock{}
	log := zaptest.NewLogger(t)
	metric := &metrics.AppMetrics{}

	chiRouter := chi.NewRouter()
	AttachChi(chiRouter, nil, throttleOps, handleMock, cntrMock, log, metric)
	return chiRouter
}

func readResponse(t *testing.T, w *httptest.ResponseRecorder) handlerResult {
	var res handlerResult

	resData, err := io.ReadAll(w.Result().Body)
	require.NoError(t, err)

	err = json.Unmarshal(resData, &res)
	require.NoErrorf(t, err, "actual body: '%s'", string(resData))
	return res
}