package httpd

import (
	"net/http"
	"strings"

	"github.com/go-chi/chi"
	"github.com/go-chi/chi/middleware"
	"github.com/go-chi/render"

	"github.com/drakkan/sftpgo/common"
	"github.com/drakkan/sftpgo/dataprovider"
	"github.com/drakkan/sftpgo/logger"
	"github.com/drakkan/sftpgo/metrics"
	"github.com/drakkan/sftpgo/version"
)

// GetHTTPRouter returns the configured HTTP handler
func GetHTTPRouter() http.Handler {
	return router
}

func initializeRouter(staticFilesPath string, enableProfiler, enableWebAdmin bool) {
	router = chi.NewRouter()

	router.Group(func(r chi.Router) {
		r.Get("/healthz", func(w http.ResponseWriter, r *http.Request) {
			render.PlainText(w, r, "ok")
		})
	})

	router.Group(func(router chi.Router) {
		router.Use(middleware.RequestID)
		router.Use(middleware.RealIP)
		router.Use(logger.NewStructuredLogger(logger.GetLogger()))
		router.Use(middleware.Recoverer)

		if enableProfiler {
			logger.InfoToConsole("enabling the built-in profiler")
			logger.Info(logSender, "", "enabling the built-in profiler")
			router.Mount(pprofBasePath, middleware.Profiler())
		}

		router.NotFound(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
			sendAPIResponse(w, r, nil, "Not Found", http.StatusNotFound)
		}))

		router.MethodNotAllowed(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
			sendAPIResponse(w, r, nil, "Method not allowed", http.StatusMethodNotAllowed)
		}))

		router.Get("/", func(w http.ResponseWriter, r *http.Request) {
			http.Redirect(w, r, webUsersPath, http.StatusMovedPermanently)
		})

		router.Group(func(router chi.Router) {
			router.Use(checkAuth)

			router.Get(webBasePath, func(w http.ResponseWriter, r *http.Request) {
				http.Redirect(w, r, webUsersPath, http.StatusMovedPermanently)
			})

			metrics.AddMetricsEndpoint(metricsPath, router)

			router.Get(versionPath, func(w http.ResponseWriter, r *http.Request) {
				render.JSON(w, r, version.Get())
			})

			router.Get(providerStatusPath, func(w http.ResponseWriter, r *http.Request) {
				err := dataprovider.GetProviderStatus()
				if err != nil {
					sendAPIResponse(w, r, err, "", http.StatusInternalServerError)
				} else {
					sendAPIResponse(w, r, err, "Alive", http.StatusOK)
				}
			})

			router.Get(activeConnectionsPath, func(w http.ResponseWriter, r *http.Request) {
				render.JSON(w, r, common.Connections.GetStats())
			})

			router.Delete(activeConnectionsPath+"/{connectionID}", handleCloseConnection)
			router.Get(quotaScanPath, getQuotaScans)
			router.Post(quotaScanPath, startQuotaScan)
			router.Get(quotaScanVFolderPath, getVFolderQuotaScans)
			router.Post(quotaScanVFolderPath, startVFolderQuotaScan)
			router.Get(userPath, getUsers)
			router.Post(userPath, addUser)
			router.Get(userPath+"/{userID}", getUserByID)
			router.Put(userPath+"/{userID}", updateUser)
			router.Delete(userPath+"/{userID}", deleteUser)
			router.Get(folderPath, getFolders)
			router.Post(folderPath, addFolder)
			router.Delete(folderPath, deleteFolderByPath)
			router.Get(dumpDataPath, dumpData)
			router.Get(loadDataPath, loadData)
			router.Put(updateUsedQuotaPath, updateUserQuotaUsage)
			router.Put(updateFolderUsedQuotaPath, updateVFolderQuotaUsage)
			if enableWebAdmin {
				router.Get(webUsersPath, handleGetWebUsers)
				router.Get(webUserPath, handleWebAddUserGet)
				router.Get(webUserPath+"/{userID}", handleWebUpdateUserGet)
				router.Post(webUserPath, handleWebAddUserPost)
				router.Post(webUserPath+"/{userID}", handleWebUpdateUserPost)
				router.Get(webConnectionsPath, handleWebGetConnections)
				router.Get(webFoldersPath, handleWebGetFolders)
				router.Get(webFolderPath, handleWebAddFolderGet)
				router.Post(webFolderPath, handleWebAddFolderPost)
			}
		})

		if enableWebAdmin {
			router.Group(func(router chi.Router) {
				compressor := middleware.NewCompressor(5)
				router.Use(compressor.Handler)
				fileServer(router, webStaticFilesPath, http.Dir(staticFilesPath))
			})
		}
	})
}

func handleCloseConnection(w http.ResponseWriter, r *http.Request) {
	connectionID := chi.URLParam(r, "connectionID")
	if connectionID == "" {
		sendAPIResponse(w, r, nil, "connectionID is mandatory", http.StatusBadRequest)
		return
	}
	if common.Connections.Close(connectionID) {
		sendAPIResponse(w, r, nil, "Connection closed", http.StatusOK)
	} else {
		sendAPIResponse(w, r, nil, "Not Found", http.StatusNotFound)
	}
}

func fileServer(r chi.Router, path string, root http.FileSystem) {
	if path != "/" && path[len(path)-1] != '/' {
		r.Get(path, http.RedirectHandler(path+"/", http.StatusMovedPermanently).ServeHTTP)
		path += "/"
	}
	path += "*"

	r.Get(path, func(w http.ResponseWriter, r *http.Request) {
		rctx := chi.RouteContext(r.Context())
		pathPrefix := strings.TrimSuffix(rctx.RoutePattern(), "/*")
		fs := http.StripPrefix(pathPrefix, http.FileServer(root))
		fs.ServeHTTP(w, r)
	})
}