package server

import (
	"encoding/json"
	"fmt"
	"local/dndex/server/auth"
	"net/http"
	"net/http/httptest"
	"strings"
	"testing"

	"github.com/google/uuid"
)

func TestUsersRegister(t *testing.T) {
	rest, _, clean := testREST(t)
	defer clean()

	t.Run("register ok", func(t *testing.T) {
		user := uuid.New().String()[:5]
		pwd := uuid.New().String()[:5]
		testRegisterOK(t, rest, user, pwd)
	})

	t.Run("register 400: nil body", func(t *testing.T) {
		r := httptest.NewRequest(http.MethodPost, "/register", nil)
		w := httptest.NewRecorder()
		rest.users(w, r)
		if w.Code < http.StatusBadRequest {
			t.Fatalf("wanted bad, got %v: %s", w.Code, w.Body.Bytes())
		}
	})

	t.Run("register 400: empty", func(t *testing.T) {
		r := httptest.NewRequest(http.MethodPost, "/register", strings.NewReader(``))
		w := httptest.NewRecorder()
		rest.users(w, r)
		if w.Code < http.StatusBadRequest {
			t.Fatalf("wanted 400, got %v: %s", w.Code, w.Body.Bytes())
		}
	})

	t.Run("register 400: only ns", func(t *testing.T) {
		r := httptest.NewRequest(http.MethodPost, "/register", strings.NewReader(`DnDex-User=`+uuid.New().String()))
		w := httptest.NewRecorder()
		rest.users(w, r)
		if w.Code < http.StatusBadRequest {
			t.Fatalf("wanted 400, got %v: %s", w.Code, w.Body.Bytes())
		}
	})

	t.Run("register collision", func(t *testing.T) {
		user := uuid.New().String()[:5]
		for i := 0; i < 2; i++ {
			pwd := uuid.New().String()[:5]
			body := fmt.Sprintf(`%s=%s&%s=%s`, auth.UserKey, user, auth.AuthKey, pwd)
			r := httptest.NewRequest(http.MethodPost, "/register", strings.NewReader(body))
			r.Header.Set("Content-Type", "application/x-www-form-urlencoded")
			w := httptest.NewRecorder()
			rest.users(w, r)
			if i == 0 {
				if w.Code != http.StatusOK {
					t.Fatalf("%d: wanted 200, got %v: %s", i, w.Code, w.Body.Bytes())
				}
			} else {
				if w.Code < http.StatusBadRequest {
					t.Fatalf("%d: wanted 400, got %v: %s", i, w.Code, w.Body.Bytes())
				}
			}
		}
	})
}

func TestUsersLogin(t *testing.T) {
	rest, _, clean := testREST(t)
	defer clean()

	t.Run("login ok", func(t *testing.T) {
		user := uuid.New().String()[:5]
		pwd := uuid.New().String()[:5]
		testRegisterOK(t, rest, user, pwd)
		testLoginOK(t, rest, user, pwd)
	})

	t.Run("login 404 user", func(t *testing.T) {
		pwd := uuid.New().String()[:5]
		testLoginNotOK(t, rest, "bad", pwd)
	})

	t.Run("login bad user", func(t *testing.T) {
		user := uuid.New().String()[:5]
		pwd := uuid.New().String()[:5]
		testRegisterOK(t, rest, user, pwd)
		testLoginNotOK(t, rest, "bad", pwd)
	})

	t.Run("login bad pwd", func(t *testing.T) {
		user := uuid.New().String()[:5]
		pwd := uuid.New().String()[:5]
		testRegisterOK(t, rest, user, pwd)
		testLoginNotOK(t, rest, user, "bad")
	})
}

func testRegisterOK(t *testing.T, rest *REST, user, pwd string) {
	body := fmt.Sprintf(`%s=%s&%s=%s`, auth.UserKey, user, auth.AuthKey, pwd)
	r := httptest.NewRequest(http.MethodPost, "/register", strings.NewReader(body))
	r.Header.Set("Content-Type", "application/x-www-form-urlencoded")
	w := httptest.NewRecorder()
	rest.users(w, r)
	if w.Code != http.StatusOK {
		t.Fatalf("wanted 200, got %v: %s", w.Code, w.Body.Bytes())
	}
}

func testLoginNotOK(t *testing.T, rest *REST, user, pwd string) {
	body := fmt.Sprintf(`%s=%s`, auth.UserKey, user)
	r := httptest.NewRequest(http.MethodPost, "/login", strings.NewReader(body))
	r.Header.Set("Content-Type", "application/x-www-form-urlencoded")
	w := httptest.NewRecorder()
	rest.users(w, r)
	if w.Code < http.StatusBadRequest {
		var resp struct {
			OK struct {
				Salt  string `json:"salt"`
				Token string `json:"token"`
			}
		}
		if err := json.NewDecoder(w.Body).Decode(&resp); err != nil {
			t.Fatal(err)
		}
		token := auth.Token{}
		if err := token.Decode(resp.OK.Salt+pwd, resp.OK.Token); err == nil {
			t.Fatal(err, token)
		}
	}
}

func testLoginOK(t *testing.T, rest *REST, user, pwd string) string {
	body := fmt.Sprintf(`%s=%s`, auth.UserKey, user)
	r := httptest.NewRequest(http.MethodPost, "/login", strings.NewReader(body))
	r.Header.Set("Content-Type", "application/x-www-form-urlencoded")
	w := httptest.NewRecorder()
	rest.users(w, r)
	if w.Code != http.StatusOK {
		t.Fatalf("wanted 200, got %v: %s", w.Code, w.Body.Bytes())
	}
	var resp struct {
		OK struct {
			Salt  string `json:"salt"`
			Token string `json:"token"`
		}
	}
	if err := json.NewDecoder(w.Body).Decode(&resp); err != nil {
		t.Fatal(err)
	}
	token := auth.Token{}
	if err := token.Decode(resp.OK.Salt+pwd, resp.OK.Token); err != nil {
		t.Fatal(err)
	}
	if token.Namespace != user {
		t.Fatal(token.Namespace)
	}
	if token.ID == "" {
		t.Fatal(token.ID)
	}
	return token.ID
}