package api

import (
	ctx "context"

	"connectrpc.com/connect"

	apiv1 "github.com/OliveTin/OliveTin/gen/olivetin/api/v1"
	apiv1connect "github.com/OliveTin/OliveTin/gen/olivetin/api/v1/apiv1connect"
	"github.com/google/uuid"
	log "github.com/sirupsen/logrus"

	"fmt"
	"net/http"

	acl "github.com/OliveTin/OliveTin/internal/acl"
	config "github.com/OliveTin/OliveTin/internal/config"
	executor "github.com/OliveTin/OliveTin/internal/executor"
	installationinfo "github.com/OliveTin/OliveTin/internal/installationinfo"
	sv "github.com/OliveTin/OliveTin/internal/stringvariables"
)

type oliveTinAPI struct {
	executor *executor.Executor
	cfg      *config.Config

	connectedClients []*connectedClients
}

type connectedClients struct {
	channel           chan *apiv1.EventStreamResponse
	AuthenticatedUser *acl.AuthenticatedUser
}

func (api *oliveTinAPI) KillAction(ctx ctx.Context, req *connect.Request[apiv1.KillActionRequest]) (*connect.Response[apiv1.KillActionResponse], error) {
	ret := &apiv1.KillActionResponse{
		ExecutionTrackingId: req.Msg.ExecutionTrackingId,
	}

	var execReqLogEntry *executor.InternalLogEntry

	execReqLogEntry, ret.Found = api.executor.GetLog(req.Msg.ExecutionTrackingId)

	if !ret.Found {
		log.Warnf("Killing execution request not possible - not found by tracking ID: %v", req.Msg.ExecutionTrackingId)
		return connect.NewResponse(ret), nil
	}

	log.Warnf("Killing execution request by tracking ID: %v", req.Msg.ExecutionTrackingId)

	action := api.cfg.FindAction(execReqLogEntry.ActionTitle)

	if action == nil {
		log.Warnf("Killing execution request not possible - action not found: %v", execReqLogEntry.ActionTitle)
		ret.Killed = false
		return connect.NewResponse(ret), nil
	}

	user := acl.UserFromContext(ctx, api.cfg)

	api.killActionByTrackingId(user, action, execReqLogEntry, ret)

	return connect.NewResponse(ret), nil
}

func (api *oliveTinAPI) killActionByTrackingId(user *acl.AuthenticatedUser, action *config.Action, execReqLogEntry *executor.InternalLogEntry, ret *apiv1.KillActionResponse) {
	if !acl.IsAllowedKill(api.cfg, user, action) {
		log.Warnf("Killing execution request not possible - user not allowed to kill this action: %v", execReqLogEntry.ExecutionTrackingID)
		ret.Killed = false
	}

	err := api.executor.Kill(execReqLogEntry)

	if err != nil {
		log.Warnf("Killing execution request err: %v", err)
		ret.AlreadyCompleted = true
		ret.Killed = false
	} else {
		ret.Killed = true
	}
}

func (api *oliveTinAPI) StartAction(ctx ctx.Context, req *connect.Request[apiv1.StartActionRequest]) (*connect.Response[apiv1.StartActionResponse], error) {
	args := make(map[string]string)

	for _, arg := range req.Msg.Arguments {
		args[arg.Name] = arg.Value
	}

	api.executor.MapActionIdToBindingLock.RLock()
	pair := api.executor.MapActionIdToBinding[req.Msg.ActionId]
	api.executor.MapActionIdToBindingLock.RUnlock()

	if pair == nil || pair.Action == nil {
		return nil, connect.NewError(connect.CodeNotFound, fmt.Errorf("action with ID %s not found", req.Msg.ActionId))
	}

	authenticatedUser := acl.UserFromContext(ctx, api.cfg)

	execReq := executor.ExecutionRequest{
		Action:            pair.Action,
		EntityPrefix:      pair.EntityPrefix,
		TrackingID:        req.Msg.UniqueTrackingId,
		Arguments:         args,
		AuthenticatedUser: authenticatedUser,
		Cfg:               api.cfg,
	}

	api.executor.ExecRequest(&execReq)

	ret := &apiv1.StartActionResponse{
		ExecutionTrackingId: execReq.TrackingID,
	}

	return connect.NewResponse(ret), nil
}

func (api *oliveTinAPI) PasswordHash(ctx ctx.Context, req *connect.Request[apiv1.PasswordHashRequest]) (*connect.Response[apiv1.PasswordHashResponse], error) {
	hash, err := createHash(req.Msg.Password)

	if err != nil {
		return nil, connect.NewError(connect.CodeInternal, fmt.Errorf("error creating hash: %w", err))
	}

	ret := &apiv1.PasswordHashResponse{
		Hash: hash,
	}

	return connect.NewResponse(ret), nil
}

func (api *oliveTinAPI) LocalUserLogin(ctx ctx.Context, req *connect.Request[apiv1.LocalUserLoginRequest]) (*connect.Response[apiv1.LocalUserLoginResponse], error) {
	match := checkUserPassword(api.cfg, req.Msg.Username, req.Msg.Password)

	if match {
		//grpc.SendHeader(ctx, metadata.Pairs("set-username", req.Username))

		log.WithFields(log.Fields{
			"username": req.Msg.Username,
		}).Info("LocalUserLogin: User logged in successfully.")
	} else {
		log.WithFields(log.Fields{
			"username": req.Msg.Username,
		}).Warn("LocalUserLogin: User login failed.")
	}

	return connect.NewResponse(&apiv1.LocalUserLoginResponse{
		Success: match,
	}), nil
}

func (api *oliveTinAPI) StartActionAndWait(ctx ctx.Context, req *connect.Request[apiv1.StartActionAndWaitRequest]) (*connect.Response[apiv1.StartActionAndWaitResponse], error) {
	args := make(map[string]string)

	for _, arg := range req.Msg.Arguments {
		args[arg.Name] = arg.Value
	}

	user := acl.UserFromContext(ctx, api.cfg)

	execReq := executor.ExecutionRequest{
		Action:            api.executor.FindActionBindingByID(req.Msg.ActionId),
		TrackingID:        uuid.NewString(),
		Arguments:         args,
		AuthenticatedUser: user,
		Cfg:               api.cfg,
	}

	wg, _ := api.executor.ExecRequest(&execReq)
	wg.Wait()

	internalLogEntry, ok := api.executor.GetLog(execReq.TrackingID)

	if ok {
		return connect.NewResponse(&apiv1.StartActionAndWaitResponse{
			LogEntry: api.internalLogEntryToPb(internalLogEntry, user),
		}), nil
	} else {
		return nil, fmt.Errorf("execution not found")
	}
}

func (api *oliveTinAPI) StartActionByGet(ctx ctx.Context, req *connect.Request[apiv1.StartActionByGetRequest]) (*connect.Response[apiv1.StartActionByGetResponse], error) {
	args := make(map[string]string)

	execReq := executor.ExecutionRequest{
		Action:            api.executor.FindActionBindingByID(req.Msg.ActionId),
		TrackingID:        uuid.NewString(),
		Arguments:         args,
		AuthenticatedUser: acl.UserFromContext(ctx, api.cfg),
		Cfg:               api.cfg,
	}

	_, uniqueTrackingId := api.executor.ExecRequest(&execReq)

	return connect.NewResponse(&apiv1.StartActionByGetResponse{
		ExecutionTrackingId: uniqueTrackingId,
	}), nil
}

func (api *oliveTinAPI) StartActionByGetAndWait(ctx ctx.Context, req *connect.Request[apiv1.StartActionByGetAndWaitRequest]) (*connect.Response[apiv1.StartActionByGetAndWaitResponse], error) {
	args := make(map[string]string)

	user := acl.UserFromContext(ctx, api.cfg)

	execReq := executor.ExecutionRequest{
		Action:            api.executor.FindActionBindingByID(req.Msg.ActionId),
		TrackingID:        uuid.NewString(),
		Arguments:         args,
		AuthenticatedUser: user,
		Cfg:               api.cfg,
	}

	wg, _ := api.executor.ExecRequest(&execReq)
	wg.Wait()

	internalLogEntry, ok := api.executor.GetLog(execReq.TrackingID)

	if ok {
		return connect.NewResponse(&apiv1.StartActionByGetAndWaitResponse{
			LogEntry: api.internalLogEntryToPb(internalLogEntry, user),
		}), nil
	} else {
		return nil, connect.NewError(connect.CodeNotFound, fmt.Errorf("execution not found"))
	}
}

func (api *oliveTinAPI) internalLogEntryToPb(logEntry *executor.InternalLogEntry, authenticatedUser *acl.AuthenticatedUser) *apiv1.LogEntry {
	pble := &apiv1.LogEntry{
		ActionTitle:         logEntry.ActionTitle,
		ActionIcon:          logEntry.ActionIcon,
		ActionId:            logEntry.ActionId,
		DatetimeStarted:     logEntry.DatetimeStarted.Format("2006-01-02 15:04:05"),
		DatetimeFinished:    logEntry.DatetimeFinished.Format("2006-01-02 15:04:05"),
		DatetimeIndex:       logEntry.Index,
		Output:              logEntry.Output,
		TimedOut:            logEntry.TimedOut,
		Blocked:             logEntry.Blocked,
		ExitCode:            logEntry.ExitCode,
		Tags:                logEntry.Tags,
		ExecutionTrackingId: logEntry.ExecutionTrackingID,
		ExecutionStarted:    logEntry.ExecutionStarted,
		ExecutionFinished:   logEntry.ExecutionFinished,
		User:                logEntry.Username,
	}

	if !pble.ExecutionFinished {
		pble.CanKill = acl.IsAllowedKill(api.cfg, authenticatedUser, api.cfg.FindAction(logEntry.ActionConfigTitle))
	}

	return pble
}

func getExecutionStatusByTrackingID(api *oliveTinAPI, executionTrackingId string) *executor.InternalLogEntry {
	logEntry, ok := api.executor.GetLog(executionTrackingId)

	if !ok {
		return nil
	}

	return logEntry
}

func getMostRecentExecutionStatusById(api *oliveTinAPI, actionId string) *executor.InternalLogEntry {
	var ile *executor.InternalLogEntry

	logs := api.executor.GetLogsByActionId(actionId)

	if len(logs) == 0 {
		return nil
	} else {
		// Get last log entry
		ile = logs[len(logs)-1]
	}

	return ile
}

func (api *oliveTinAPI) ExecutionStatus(ctx ctx.Context, req *connect.Request[apiv1.ExecutionStatusRequest]) (*connect.Response[apiv1.ExecutionStatusResponse], error) {
	res := &apiv1.ExecutionStatusResponse{}

	user := acl.UserFromContext(ctx, api.cfg)

	var ile *executor.InternalLogEntry

	if req.Msg.ExecutionTrackingId != "" {
		ile = getExecutionStatusByTrackingID(api, req.Msg.ExecutionTrackingId)

	} else {
		ile = getMostRecentExecutionStatusById(api, req.Msg.ActionId)
	}

	if ile == nil {
		return nil, connect.NewError(connect.CodeNotFound, fmt.Errorf("execution not found for tracking ID %s or action ID %s", req.Msg.ExecutionTrackingId, req.Msg.ActionId))
	} else {
		res.LogEntry = api.internalLogEntryToPb(ile, user)
	}

	return connect.NewResponse(res), nil
}

/**
func (api *oliveTinAPI) WatchExecution(req *apiv1.WatchExecutionRequest, srv apiv1.OliveTinApi_WatchExecutionServer) error {
	log.Infof("Watch")

	if logEntry, ok := api.executor.Logs[req.ExecutionUuid]; !ok {
		log.Errorf("Execution not found: %v", req.ExecutionUuid)

		return nil
	} else {
		if logEntry.ExecutionStarted {
			for !logEntry.ExecutionCompleted {
				tmp := make([]byte, 256)

				red, err := io.ReadAtLeast(logEntry.StdoutBuffer, tmp, 1)

				log.Infof("%v %v", red, err)

				srv.Send(&apiv1.WatchExecutionUpdate{
					Update: string(tmp),
				})
			}
		}

		return nil
	}
}
*/

func (api *oliveTinAPI) Logout(ctx ctx.Context, req *connect.Request[apiv1.LogoutRequest]) (*connect.Response[apiv1.LogoutResponse], error) {
	//user := acl.UserFromContext(ctx, cfg)

	//grpc.SendHeader(ctx, metadata.Pairs("logout-provider", user.Provider))
	//grpc.SendHeader(ctx, metadata.Pairs("logout-sid", user.SID))

	return nil, nil
}

func (api *oliveTinAPI) GetDashboardComponents(ctx ctx.Context, req *connect.Request[apiv1.GetDashboardComponentsRequest]) (*connect.Response[apiv1.GetDashboardComponentsResponse], error) {
	user := acl.UserFromContext(ctx, api.cfg)

	if user.IsGuest() && api.cfg.AuthRequireGuestsToLogin {
		return nil, connect.NewError(connect.CodePermissionDenied, fmt.Errorf("guests are not allowed to access the dashboard"))
	}

	res := buildDashboardResponse(api.executor, api.cfg, user)

	/*
		if len(res.Actions) == 0 {
			log.WithFields(log.Fields{
				"username":         user.Username,
				"usergroupLine":    user.UsergroupLine,
				"provider":         user.Provider,
				"acls":             user.Acls,
				"availableActions": len(api.cfg.Actions),
			}).Warn("Zero actions found for user")
		}
	*/

	log.Tracef("GetDashboardComponents: %v", res)

	return connect.NewResponse(res), nil
}

func (api *oliveTinAPI) GetLogs(ctx ctx.Context, req *connect.Request[apiv1.GetLogsRequest]) (*connect.Response[apiv1.GetLogsResponse], error) {
	user := acl.UserFromContext(ctx, api.cfg)

	ret := &apiv1.GetLogsResponse{}

	logEntries, countRemaining := api.executor.GetLogTrackingIds(req.Msg.StartOffset, api.cfg.LogHistoryPageSize)

	for _, logEntry := range logEntries {
		action := api.cfg.FindAction(logEntry.ActionTitle)

		if action == nil || acl.IsAllowedLogs(api.cfg, user, action) {
			pbLogEntry := api.internalLogEntryToPb(logEntry, user)

			ret.Logs = append(ret.Logs, pbLogEntry)
		}
	}

	ret.CountRemaining = countRemaining
	ret.PageSize = api.cfg.LogHistoryPageSize

	return connect.NewResponse(ret), nil
}

/*
This function is ONLY a helper for the UI - the arguments are validated properly
on the StartAction -> Executor chain. This is here basically to provide helpful
error messages more quickly before starting the action.
*/
func (api *oliveTinAPI) ValidateArgumentType(ctx ctx.Context, req *connect.Request[apiv1.ValidateArgumentTypeRequest]) (*connect.Response[apiv1.ValidateArgumentTypeResponse], error) {
	err := executor.TypeSafetyCheck("", req.Msg.Value, req.Msg.Type)
	desc := ""

	if err != nil {
		desc = err.Error()
	}

	return connect.NewResponse(&apiv1.ValidateArgumentTypeResponse{
		Valid:       err == nil,
		Description: desc,
	}), nil
}

func (api *oliveTinAPI) WhoAmI(ctx ctx.Context, req *connect.Request[apiv1.WhoAmIRequest]) (*connect.Response[apiv1.WhoAmIResponse], error) {
	user := acl.UserFromContext(ctx, api.cfg)

	res := &apiv1.WhoAmIResponse{
		AuthenticatedUser: user.Username,
		Usergroup:         user.UsergroupLine,
		Provider:          user.Provider,
		Sid:               user.SID,
		Acls:              user.Acls,
	}

	return connect.NewResponse(res), nil
}

func (api *oliveTinAPI) SosReport(ctx ctx.Context, req *connect.Request[apiv1.SosReportRequest]) (*connect.Response[apiv1.SosReportResponse], error) {
	sos := installationinfo.GetSosReport()

	if !api.cfg.InsecureAllowDumpSos {
		log.Info(sos)
		sos = "Your SOS Report has been logged to OliveTin logs.\n\nIf you are in a safe network, you can temporarily set `insecureAllowDumpSos: true` in your config.yaml, restart OliveTin, and refresh this page - it will put the output directly in the browser."
	}

	ret := &apiv1.SosReportResponse{
		Alert: sos,
	}

	return connect.NewResponse(ret), nil
}

func (api *oliveTinAPI) DumpVars(ctx ctx.Context, req *connect.Request[apiv1.DumpVarsRequest]) (*connect.Response[apiv1.DumpVarsResponse], error) {
	res := &apiv1.DumpVarsResponse{}

	if !api.cfg.InsecureAllowDumpVars {
		res.Alert = "Dumping variables is not allowed by default because it is insecure."

		return connect.NewResponse(res), nil
	}

	res.Alert = "Dumping variables has been enabled in the configuration. Please set InsecureAllowDumpVars = false again after you don't need it anymore"
	res.Contents = sv.GetAll()

	return connect.NewResponse(res), nil
}

func (api *oliveTinAPI) DumpPublicIdActionMap(ctx ctx.Context, req *connect.Request[apiv1.DumpPublicIdActionMapRequest]) (*connect.Response[apiv1.DumpPublicIdActionMapResponse], error) {
	res := &apiv1.DumpPublicIdActionMapResponse{}
	res.Contents = make(map[string]*apiv1.ActionEntityPair)

	if !api.cfg.InsecureAllowDumpActionMap {
		res.Alert = "Dumping Public IDs is disallowed."

		return connect.NewResponse(res), nil
	}

	api.executor.MapActionIdToBindingLock.RLock()

	for k, v := range api.executor.MapActionIdToBinding {
		res.Contents[k] = &apiv1.ActionEntityPair{
			ActionTitle:  v.Action.Title,
			EntityPrefix: v.EntityPrefix,
		}
	}

	api.executor.MapActionIdToBindingLock.RUnlock()

	res.Alert = "Dumping variables has been enabled in the configuration. Please set InsecureAllowDumpActionMap = false again after you don't need it anymore"

	return connect.NewResponse(res), nil
}

func (api *oliveTinAPI) GetReadyz(ctx ctx.Context, req *connect.Request[apiv1.GetReadyzRequest]) (*connect.Response[apiv1.GetReadyzResponse], error) {
	res := &apiv1.GetReadyzResponse{
		Status: "OK",
	}

	return connect.NewResponse(res), nil
}

func (api *oliveTinAPI) EventStream(ctx ctx.Context, req *connect.Request[apiv1.EventStreamRequest], srv *connect.ServerStream[apiv1.EventStreamResponse]) error {
	log.Debugf("EventStream: %v", req.Msg)

	client := &connectedClients{
		channel:           make(chan *apiv1.EventStreamResponse, 10), // Buffered channel to hold Events
		AuthenticatedUser: acl.UserFromContext(ctx, api.cfg),
	}

	log.Infof("EventStream: client connected: %v", client.AuthenticatedUser.Username)

	api.connectedClients = append(api.connectedClients, client)

	// loop over client channel and send events to connectedClient
	for msg := range client.channel {
		log.Debugf("Sending event to client: %v", msg)
		if err := srv.Send(msg); err != nil {
			log.Errorf("Error sending event to client: %v", err)
		}
	}

	log.Infof("EventStream: client disconnected")

	return nil
}

func (api *oliveTinAPI) OnActionMapRebuilt() {
	for _, client := range api.connectedClients {
		select {
		case client.channel <- &apiv1.EventStreamResponse{
			Event: &apiv1.EventStreamResponse_ConfigChanged{
				ConfigChanged: &apiv1.EventConfigChanged{},
			},
		}:
		default:
			log.Warnf("EventStream: client channel is full, dropping message")
		}
	}
}

func (api *oliveTinAPI) OnExecutionStarted(ex *executor.InternalLogEntry) {
	for _, client := range api.connectedClients {
		select {
		case client.channel <- &apiv1.EventStreamResponse{
			Event: &apiv1.EventStreamResponse_ExecutionStarted{
				ExecutionStarted: &apiv1.EventExecutionStarted{
					LogEntry: api.internalLogEntryToPb(ex, client.AuthenticatedUser),
				},
			},
		}:
		default:
			log.Warnf("EventStream: client channel is full, dropping message")
		}
	}
}

func (api *oliveTinAPI) OnExecutionFinished(ex *executor.InternalLogEntry) {
	for _, client := range api.connectedClients {
		select {
		case client.channel <- &apiv1.EventStreamResponse{
			Event: &apiv1.EventStreamResponse_ExecutionFinished{
				ExecutionFinished: &apiv1.EventExecutionFinished{
					LogEntry: api.internalLogEntryToPb(ex, client.AuthenticatedUser),
				},
			},
		}:
		default:
			log.Warnf("EventStream: client channel is full, dropping message")
		}
	}
}

func (api *oliveTinAPI) GetDiagnostics(ctx ctx.Context, req *connect.Request[apiv1.GetDiagnosticsRequest]) (*connect.Response[apiv1.GetDiagnosticsResponse], error) {
	res := &apiv1.GetDiagnosticsResponse{
		SshFoundKey:    installationinfo.Runtime.SshFoundKey,
		SshFoundConfig: installationinfo.Runtime.SshFoundConfig,
	}

	return connect.NewResponse(res), nil
}

func (api *oliveTinAPI) OnOutputChunk(content []byte, executionTrackingId string) {
	for _, client := range api.connectedClients {
		select {
		case client.channel <- &apiv1.EventStreamResponse{
			Event: &apiv1.EventStreamResponse_OutputChunk{
				OutputChunk: &apiv1.EventOutputChunk{
					Output:              string(content),
					ExecutionTrackingId: executionTrackingId,
				},
			},
		}:
		default:
			log.Warnf("EventStream: client channel is full, dropping message")
		}
	}
}

func newServer(ex *executor.Executor) *oliveTinAPI {
	server := oliveTinAPI{}
	server.cfg = ex.Cfg
	server.executor = ex

	ex.AddListener(&server)
	return &server
}

func GetNewHandler(ex *executor.Executor) (string, http.Handler) {
	server := newServer(ex)

	return apiv1connect.NewOliveTinApiServiceHandler(server)
}