package controller

import (
	"encoding/json"
	"errors"
	"net/http"
	"os"
	"strings"
	"syscall"
	"time"

	"github.com/gorilla/mux"
	"golang.org/x/exp/slog"

	"github.com/gravitl/netmaker/database"
	"github.com/gravitl/netmaker/logger"
	"github.com/gravitl/netmaker/logic"
	"github.com/gravitl/netmaker/models"
	"github.com/gravitl/netmaker/mq"
	"github.com/gravitl/netmaker/servercfg"
)

var cpuProfileLog *os.File

func serverHandlers(r *mux.Router) {
	// r.HandleFunc("/api/server/addnetwork/{network}", securityCheckServer(true, http.HandlerFunc(addNetwork))).Methods(http.MethodPost)
	r.HandleFunc(
		"/api/server/health",
		func(resp http.ResponseWriter, req *http.Request) {
			resp.WriteHeader(http.StatusOK)
			resp.Write([]byte("Server is up and running!!"))
		},
	).Methods(http.MethodGet)
	r.HandleFunc(
		"/api/server/shutdown",
		func(w http.ResponseWriter, _ *http.Request) {
			msg := "received api call to shutdown server, sending interruption..."
			slog.Warn(msg)
			_, _ = w.Write([]byte(msg))
			w.WriteHeader(http.StatusOK)
			_ = syscall.Kill(syscall.Getpid(), syscall.SIGINT)
		},
	).Methods(http.MethodPost)
	r.HandleFunc("/api/server/getconfig", allowUsers(http.HandlerFunc(getConfig))).
		Methods(http.MethodGet)
	r.HandleFunc("/api/server/settings", allowUsers(http.HandlerFunc(getSettings))).
		Methods(http.MethodGet)
	r.HandleFunc("/api/server/settings", logic.SecurityCheck(true, http.HandlerFunc(updateSettings))).
		Methods(http.MethodPut)
	r.HandleFunc("/api/server/getserverinfo", logic.SecurityCheck(true, http.HandlerFunc(getServerInfo))).
		Methods(http.MethodGet)
	r.HandleFunc("/api/server/status", getStatus).Methods(http.MethodGet)
	r.HandleFunc("/api/server/usage", logic.SecurityCheck(false, http.HandlerFunc(getUsage))).
		Methods(http.MethodGet)
	r.HandleFunc("/api/server/cpu_profile", logic.SecurityCheck(false, http.HandlerFunc(cpuProfile))).
		Methods(http.MethodPost)
	r.HandleFunc("/api/server/mem_profile", logic.SecurityCheck(false, http.HandlerFunc(memProfile))).
		Methods(http.MethodPost)
}

func cpuProfile(w http.ResponseWriter, r *http.Request) {
	start := r.URL.Query().Get("action") == "start"
	if start {
		os.Remove("/root/data/cpu.prof")
		cpuProfileLog = logic.StartCPUProfiling()
	} else {
		if cpuProfileLog != nil {
			logic.StopCPUProfiling(cpuProfileLog)
			cpuProfileLog = nil
		}
	}
}
func memProfile(w http.ResponseWriter, r *http.Request) {
	os.Remove("/root/data/mem.prof")
	logic.StartMemProfiling()
}

func getUsage(w http.ResponseWriter, _ *http.Request) {
	type usage struct {
		Hosts            int `json:"hosts"`
		Clients          int `json:"clients"`
		Networks         int `json:"networks"`
		Users            int `json:"users"`
		Ingresses        int `json:"ingresses"`
		Egresses         int `json:"egresses"`
		Relays           int `json:"relays"`
		InternetGateways int `json:"internet_gateways"`
		FailOvers        int `json:"fail_overs"`
	}
	var serverUsage usage
	hosts, err := logic.GetAllHostsWithStatus(models.OnlineSt)
	if err == nil {
		serverUsage.Hosts = len(hosts)
	}
	clients, err := logic.GetAllExtClientsWithStatus(models.OnlineSt)
	if err == nil {
		serverUsage.Clients = len(clients)
	}
	users, err := logic.GetUsers()
	if err == nil {
		serverUsage.Users = len(users)
	}
	networks, err := logic.GetNetworks()
	if err == nil {
		serverUsage.Networks = len(networks)
	}
	// TODO this part bellow can be optimized to get nodes just once
	ingresses, err := logic.GetAllIngresses()
	if err == nil {
		serverUsage.Ingresses = len(ingresses)
	}
	egresses, err := logic.GetAllEgresses()
	if err == nil {
		serverUsage.Egresses = len(egresses)
	}
	relays, err := logic.GetRelays()
	if err == nil {
		serverUsage.Relays = len(relays)
	}
	gateways, err := logic.GetInternetGateways()
	if err == nil {
		serverUsage.InternetGateways = len(gateways)
	}
	failOvers, err := logic.GetAllFailOvers()
	if err == nil {
		serverUsage.FailOvers = len(failOvers)
	}
	w.Header().Set("Content-Type", "application/json")
	json.NewEncoder(w).Encode(models.SuccessResponse{
		Code:     http.StatusOK,
		Response: serverUsage,
	})
}

// @Summary     Get the server status
// @Router      /api/server/status [get]
// @Tags        Server
// @Security    oauth2
func getStatus(w http.ResponseWriter, r *http.Request) {
	// @Success     200 {object} status
	type status struct {
		DB               bool      `json:"db_connected"`
		Broker           bool      `json:"broker_connected"`
		IsBrokerConnOpen bool      `json:"is_broker_conn_open"`
		LicenseError     string    `json:"license_error"`
		IsPro            bool      `json:"is_pro"`
		TrialEndDate     time.Time `json:"trial_end_date"`
		IsOnTrialLicense bool      `json:"is_on_trial_license"`
	}

	licenseErr := ""
	if servercfg.ErrLicenseValidation != nil {
		licenseErr = servercfg.ErrLicenseValidation.Error()
	}
	//var trialEndDate time.Time
	//var err error
	// isOnTrial := false
	// if servercfg.IsPro &&
	// 	(servercfg.GetLicenseKey() == "" || servercfg.GetNetmakerTenantID() == "") {
	// 	trialEndDate, err = logic.GetTrialEndDate()
	// 	if err != nil {
	// 		slog.Error("failed to get trial end date", "error", err)
	// 	} else {
	// 		isOnTrial = true
	// 	}
	// }
	currentServerStatus := status{
		DB:               database.IsConnected(),
		Broker:           mq.IsConnected(),
		IsBrokerConnOpen: mq.IsConnectionOpen(),
		LicenseError:     licenseErr,
		IsPro:            servercfg.IsPro,
		//TrialEndDate:     trialEndDate,
		//IsOnTrialLicense: isOnTrial,
	}

	w.Header().Set("Content-Type", "application/json")
	json.NewEncoder(w).Encode(&currentServerStatus)
}

// allowUsers - allow all authenticated (valid) users - only used by getConfig, may be able to remove during refactor
func allowUsers(next http.Handler) http.HandlerFunc {
	return func(w http.ResponseWriter, r *http.Request) {
		errorResponse := models.ErrorResponse{
			Code: http.StatusUnauthorized, Message: logic.Unauthorized_Msg,
		}
		bearerToken := r.Header.Get("Authorization")
		tokenSplit := strings.Split(bearerToken, " ")
		authToken := ""
		if len(tokenSplit) < 2 {
			logic.ReturnErrorResponse(w, r, errorResponse)
			return
		} else {
			authToken = tokenSplit[1]
		}
		user, _, _, err := logic.VerifyUserToken(authToken)
		if err != nil || user == "" {
			logic.ReturnErrorResponse(w, r, errorResponse)
			return
		}
		next.ServeHTTP(w, r)
	}
}

// @Summary     Get the server information
// @Router      /api/server/getserverinfo [get]
// @Tags        Server
// @Security    oauth2
// @Success     200 {object} models.ServerConfig
func getServerInfo(w http.ResponseWriter, r *http.Request) {
	// Set header
	w.Header().Set("Content-Type", "application/json")

	// get params

	json.NewEncoder(w).Encode(logic.GetServerInfo())
	// w.WriteHeader(http.StatusOK)
}

// @Summary     Get the server configuration
// @Router      /api/server/getconfig [get]
// @Tags        Server
// @Security    oauth2
// @Success     200 {object} config.ServerConfig
func getConfig(w http.ResponseWriter, r *http.Request) {
	// Set header
	w.Header().Set("Content-Type", "application/json")

	// get params

	scfg := logic.GetServerConfig()
	scfg.IsPro = "no"
	if servercfg.IsPro {
		scfg.IsPro = "yes"
	}
	json.NewEncoder(w).Encode(scfg)
	// w.WriteHeader(http.StatusOK)
}

// @Summary     Get the server settings
// @Router      /api/server/settings [get]
// @Tags        Server
// @Security    oauth2
// @Success     200 {object} config.ServerSettings
func getSettings(w http.ResponseWriter, r *http.Request) {
	scfg := logic.GetServerSettings()
	scfg.ClientSecret = logic.Mask()
	logic.ReturnSuccessResponseWithJson(w, r, scfg, "fetched server settings successfully")
}

// @Summary     Update the server settings
// @Router      /api/server/settings [put]
// @Tags        Server
// @Security    oauth2
// @Success     200 {object} config.ServerSettings
func updateSettings(w http.ResponseWriter, r *http.Request) {
	var req models.ServerSettings
	force := r.URL.Query().Get("force")
	if err := json.NewDecoder(r.Body).Decode(&req); err != nil {
		logger.Log(0, r.Header.Get("user"), "error decoding request body: ", err.Error())
		logic.ReturnErrorResponse(w, r, logic.FormatError(err, "badrequest"))
		return
	}
	if !logic.ValidateNewSettings(req) {
		logic.ReturnErrorResponse(w, r, logic.FormatError(errors.New("invalid settings"), "badrequest"))
		return
	}
	currSettings := logic.GetServerSettings()
	err := logic.UpsertServerSettings(req)
	if err != nil {
		logic.ReturnErrorResponse(w, r, logic.FormatError(errors.New("failed to udpate server settings "+err.Error()), "internal"))
		return
	}
	logic.LogEvent(&models.Event{
		Action: models.Update,
		Source: models.Subject{
			ID:   r.Header.Get("user"),
			Name: r.Header.Get("user"),
			Type: models.UserSub,
		},
		TriggeredBy: r.Header.Get("user"),
		Target: models.Subject{
			ID:   models.SettingSub.String(),
			Name: models.SettingSub.String(),
			Type: models.SettingSub,
		},
		Diff: models.Diff{
			Old: currSettings,
			New: req,
		},
		Origin: models.Dashboard,
	})
	go reInit(currSettings, req, force == "true")
	logic.ReturnSuccessResponseWithJson(w, r, req, "updated server settings successfully")
}

func reInit(curr, new models.ServerSettings, force bool) {
	logic.SettingsMutex.Lock()
	defer logic.SettingsMutex.Unlock()
	logic.ResetAuthProvider()
	logic.EmailInit()
	logic.SetVerbosity(int(logic.GetServerSettings().Verbosity))
	logic.ResetIDPSyncHook()
	// check if auto update is changed
	if force {
		if curr.NetclientAutoUpdate != new.NetclientAutoUpdate {
			// update all hosts
			hosts, _ := logic.GetAllHosts()
			for _, host := range hosts {
				host.AutoUpdate = new.NetclientAutoUpdate
				logic.UpsertHost(&host)
				mq.HostUpdate(&models.HostUpdate{
					Action: models.UpdateHost,
					Host:   host,
				})
			}
		}
	}
	go mq.PublishPeerUpdate(false)

}