package api_test

import (
	"bytes"
	"encoding/json"
	"fmt"
	"io"
	"mime/multipart"
	"net/http"
	"net/http/httptest"
	"strings"
	"testing"
	"time"

	"git.t-juice.club/torjus/gpaste"
	"git.t-juice.club/torjus/gpaste/api"
	"git.t-juice.club/torjus/gpaste/files"
	"git.t-juice.club/torjus/gpaste/users"
	"github.com/google/go-cmp/cmp"
	"github.com/google/uuid"
)

func TestHandlers(t *testing.T) {
	//cfg := &gpaste.ServerConfig{
	//	SigningSecret: "abc123",
	//	Store: &gpaste.ServerStoreConfig{
	//		Type: "memory",
	//	},
	//	URL: "http://localhost:8080",
	//}
	//hs := api.NewHTTPServer(cfg)

	t.Run("index", func(t *testing.T) {
		hs := newServer()
		rr := httptest.NewRecorder()
		req := httptest.NewRequest(http.MethodGet, "/", nil)

		hs.Handler.ServeHTTP(rr, req)

		if status := rr.Code; status != http.StatusOK {
			t.Errorf("Returned unexpected status")
		}

		expectedBody := "index"
		if body := rr.Body.String(); body != expectedBody {
			t.Errorf("Body does not match expected. Got %s want %s", body, expectedBody)
		}
	})
	t.Run("api", func(t *testing.T) {
		t.Run("file", func(t *testing.T) {
			// POST /api/file
			t.Run("POST", func(t *testing.T) {
				hs := newServer()
				rr := httptest.NewRecorder()
				buf := &bytes.Buffer{}
				mw := multipart.NewWriter(buf)
				fw, err := mw.CreateFormFile("test", "test.txt")
				if err != nil {
					t.Fatalf("Unable to create form file: %s", err)
				}
				expectedData := "Test OMEGALUL PLS."
				if _, err := io.WriteString(fw, expectedData); err != nil {
					t.Fatalf("Unable to write body to buffer: %s", err)
				}
				mw.Close()

				req := httptest.NewRequest(http.MethodPost, "/api/file?max_views=99", buf)
				req.Header.Add("Content-Type", mw.FormDataContentType())

				hs.Handler.ServeHTTP(rr, req)

				if status := rr.Code; status != http.StatusAccepted {
					t.Errorf("Returned unexpected status. Got %d want %d", status, http.StatusAccepted)
				}

				var expectedResp []struct {
					Message string `json:"message"`
					ID      string `json:"id"`
					URL     string `json:"url"`
				}

				decoder := json.NewDecoder(rr.Result().Body)
				if err := decoder.Decode(&expectedResp); err != nil {
					t.Fatalf("error decoding response: %s", err)
				}

				if l := len(expectedResp); l != 1 {
					t.Errorf("Response has wrong length. Got %d want %d", l, 1)
				}

				uploadID := expectedResp[0].ID
				if uploadID == "" {
					t.Errorf("Response has empty id")
				}

				retrieved, err := hs.Files.Get(uploadID)
				if err != nil {
					t.Errorf("Error retrieving file: %s", err)
				}
				defer retrieved.Body.Close()
				retBuf := new(bytes.Buffer)
				io.Copy(retBuf, retrieved.Body)
				if diff := cmp.Diff(retBuf.String(), expectedData); diff != "" {
					t.Errorf("Retrieved file mismatch: %s", diff)
				}

				if retrieved.MaxViews != 99 {
					t.Errorf("Uploaded file has wrong max_views: %d", retrieved.MaxViews)
				}
			})
			// GET /api/file/id
			t.Run("GET", func(t *testing.T) {
				hs := newServer()
				fileData := "abc123456"
				sr := io.NopCloser(strings.NewReader(fileData))
				file := &files.File{
					ID:               uuid.NewString(),
					OriginalFilename: "test-file.txt",
					MaxViews:         99,
					ExpiresOn:        time.Now().Add(90 * time.Second),
					Body:             sr,
				}
				hs.Files.Store(file)
				rr := httptest.NewRecorder()
				url := fmt.Sprintf("/api/file/%s", file.ID)
				req := httptest.NewRequest(http.MethodGet, url, nil)

				hs.Handler.ServeHTTP(rr, req)

				if status := rr.Code; status != http.StatusOK {
					t.Errorf("Returned unexpected status. Got %d want %d", status, http.StatusAccepted)
					t.Logf(url)
				}
				if diff := cmp.Diff(rr.Body.String(), fileData); diff != "" {
					t.Errorf("Returned body does not match expected: %s", diff)
				}
			})

			// DELETE /api/file/id
			t.Run("DELETE", func(t *testing.T) {
				hs := newServer()
				fileBody := io.NopCloser(strings.NewReader("roflcopter"))
				file := &files.File{
					ID:               uuid.NewString(),
					OriginalFilename: "testpls.txt",
					MaxViews:         9,
					ExpiresOn:        time.Now().Add(10 * time.Hour),
					Body:             fileBody,
				}

				if err := hs.Files.Store(file); err != nil {
					t.Fatalf("Error storing file: %s", err)
				}

				rr := httptest.NewRecorder()
				url := fmt.Sprintf("/api/file/%s", file.ID)
				req := httptest.NewRequest(http.MethodDelete, url, nil)
				hs.Handler.ServeHTTP(rr, req)

				if rr.Result().StatusCode != http.StatusOK {
					t.Fatalf("Delete returned wrong status: %s", rr.Result().Status)
				}

				if _, err := hs.Files.Get(file.ID); err == nil {
					t.Errorf("Getting after delete returned no error")
				}
			})
		})
		// /api/user

		t.Run("user", func(t *testing.T) {
			t.Run("POST", func(t *testing.T) {
				hs := newServer()
				adminPw := "admin"
				admin := &users.User{
					Username: "admin",
					Role:     users.RoleAdmin,
				}
				_ = admin.SetPassword(adminPw)
				_ = hs.Users.Store(admin)

				token, err := hs.Auth.Login(admin.Username, adminPw)
				if err != nil {
					t.Fatalf("error getting admin token: %s", err)
				}

				requestData := &api.RequestAPIUserCreate{
					Username: "test",
					Password: "test",
				}
				body := new(bytes.Buffer)
				encoder := json.NewEncoder(body)
				if err := encoder.Encode(requestData); err != nil {
					t.Fatalf("Error encoding data: %s", err)
				}

				rr := httptest.NewRecorder()
				req := httptest.NewRequest(http.MethodPost, "/api/user", body)
				req.Header.Add("Authorization", fmt.Sprintf("Bearer %s", token))
				hs.Handler.ServeHTTP(rr, req)

				if rr.Result().StatusCode != http.StatusAccepted {
					t.Fatalf("Create returned wrong status: %s", rr.Result().Status)
				}

				user, err := hs.Users.Get(requestData.Username)
				if err != nil {
					t.Fatalf("Unable to get user after create: %s", err)
				}

				expectedUser := &users.User{
					Username: requestData.Username,
					Role:     users.RoleUser,
				}
				ignorePW := cmp.FilterPath(func(p cmp.Path) bool {
					return p.String() == "HashedPassword"
				}, cmp.Ignore())

				if diff := cmp.Diff(user, expectedUser, ignorePW); diff != "" {
					t.Errorf("User does not match expected: %s", diff)
				}
			})
		})

		// /api/login
		t.Run("Login", func(t *testing.T) {
			hs := newServer()
			// TODO: Add test
			username := "admin"
			password := "admin"
			user := &users.User{Username: username}
			if err := user.SetPassword(password); err != nil {
				t.Fatalf("Error setting user password: %s", err)
			}
			if err := hs.Users.Store(user); err != nil {
				t.Fatalf("Error storing user: %s", err)
			}

			requestData := struct {
				Username string `json:"username"`
				Password string `json:"password"`
			}{
				Username: username,
				Password: password,
			}

			body := new(bytes.Buffer)
			encoder := json.NewEncoder(body)
			if err := encoder.Encode(&requestData); err != nil {
				t.Fatalf("Error encoding request body: %s", err)
			}

			rr := httptest.NewRecorder()
			req := httptest.NewRequest(http.MethodPost, "/api/login", body)

			hs.Handler.ServeHTTP(rr, req)

			responseData := struct {
				Token string `json:"token"`
			}{}

			decoder := json.NewDecoder(rr.Body)
			if err := decoder.Decode(&responseData); err != nil {
				t.Fatalf("Error decoding response: %s", err)
			}

			if _, err := hs.Auth.ValidateToken(responseData.Token); err != nil {
				t.Fatalf("Unable to validate received token: %s", err)
			}
		})
	})

}

func newServer() *api.HTTPServer {
	cfg := &gpaste.ServerConfig{
		SigningSecret: "abc123",
		Store: &gpaste.ServerStoreConfig{
			Type: "memory",
		},
		URL: "http://localhost:8080",
	}
	return api.NewHTTPServer(cfg)
}