//go:build !android && !ios

package server

import (
	"bytes"
	"context"
	"errors"
	"fmt"
	"runtime/pprof"

	log "github.com/sirupsen/logrus"

	"github.com/netbirdio/netbird/client/internal/debug"
	"github.com/netbirdio/netbird/client/proto"
	mgmProto "github.com/netbirdio/netbird/shared/management/proto"
)

// DebugBundle creates a debug bundle and returns the location.
func (s *Server) DebugBundle(_ context.Context, req *proto.DebugBundleRequest) (resp *proto.DebugBundleResponse, err error) {
	s.mutex.Lock()
	defer s.mutex.Unlock()

	syncResponse, err := s.getLatestSyncResponse()
	if err != nil {
		log.Warnf("failed to get latest sync response: %v", err)
	}

	var clientMetrics debug.MetricsExporter
	if s.connectClient != nil {
		if engine := s.connectClient.Engine(); engine != nil {
			if cm := engine.GetClientMetrics(); cm != nil {
				clientMetrics = cm
			}
		}
	}

	var cpuProfileData []byte
	if s.cpuProfileBuf != nil && !s.cpuProfiling {
		cpuProfileData = s.cpuProfileBuf.Bytes()
		defer func() {
			s.cpuProfileBuf = nil
		}()
	}

	// Prepare refresh callback for health probes
	var refreshStatus func()
	if s.connectClient != nil {
		engine := s.connectClient.Engine()
		if engine != nil {
			refreshStatus = func() {
				log.Debug("refreshing system health status for debug bundle")
				engine.RunHealthProbes(true)
			}
		}
	}

	bundleGenerator := debug.NewBundleGenerator(
		debug.GeneratorDependencies{
			InternalConfig: s.config,
			StatusRecorder: s.statusRecorder,
			SyncResponse:   syncResponse,
			LogPath:        s.logFile,
			CPUProfile:     cpuProfileData,
			RefreshStatus:  refreshStatus,
			ClientMetrics:  clientMetrics,
		},
		debug.BundleConfig{
			Anonymize:         req.GetAnonymize(),
			IncludeSystemInfo: req.GetSystemInfo(),
			LogFileCount:      req.GetLogFileCount(),
		},
	)

	path, err := bundleGenerator.Generate()
	if err != nil {
		return nil, fmt.Errorf("generate debug bundle: %w", err)
	}

	if req.GetUploadURL() == "" {
		return &proto.DebugBundleResponse{Path: path}, nil
	}
	key, err := debug.UploadDebugBundle(context.Background(), req.GetUploadURL(), s.config.ManagementURL.String(), path)
	if err != nil {
		log.Errorf("failed to upload debug bundle to %s: %v", req.GetUploadURL(), err)
		return &proto.DebugBundleResponse{Path: path, UploadFailureReason: err.Error()}, nil
	}

	log.Infof("debug bundle uploaded to %s with key %s", req.GetUploadURL(), key)

	return &proto.DebugBundleResponse{Path: path, UploadedKey: key}, nil
}

// GetLogLevel gets the current logging level for the server.
func (s *Server) GetLogLevel(_ context.Context, _ *proto.GetLogLevelRequest) (*proto.GetLogLevelResponse, error) {
	s.mutex.Lock()
	defer s.mutex.Unlock()

	level := ParseLogLevel(log.GetLevel().String())
	return &proto.GetLogLevelResponse{Level: level}, nil
}

// SetLogLevel sets the logging level for the server.
func (s *Server) SetLogLevel(_ context.Context, req *proto.SetLogLevelRequest) (*proto.SetLogLevelResponse, error) {
	s.mutex.Lock()
	defer s.mutex.Unlock()

	level, err := log.ParseLevel(req.Level.String())
	if err != nil {
		return nil, fmt.Errorf("invalid log level: %w", err)
	}

	log.SetLevel(level)

	if s.connectClient != nil {
		s.connectClient.SetLogLevel(level)
	}

	log.Infof("Log level set to %s", level.String())

	return &proto.SetLogLevelResponse{}, nil
}

// SetSyncResponsePersistence sets the sync response persistence for the server.
func (s *Server) SetSyncResponsePersistence(_ context.Context, req *proto.SetSyncResponsePersistenceRequest) (*proto.SetSyncResponsePersistenceResponse, error) {
	s.mutex.Lock()
	defer s.mutex.Unlock()

	enabled := req.GetEnabled()
	s.persistSyncResponse = enabled
	if s.connectClient != nil {
		s.connectClient.SetSyncResponsePersistence(enabled)
	}

	return &proto.SetSyncResponsePersistenceResponse{}, nil
}

func (s *Server) getLatestSyncResponse() (*mgmProto.SyncResponse, error) {
	cClient := s.connectClient
	if cClient == nil {
		return nil, errors.New("connect client is not initialized")
	}

	return cClient.GetLatestSyncResponse()
}

// StartCPUProfile starts CPU profiling in the daemon.
func (s *Server) StartCPUProfile(_ context.Context, _ *proto.StartCPUProfileRequest) (*proto.StartCPUProfileResponse, error) {
	s.mutex.Lock()
	defer s.mutex.Unlock()

	if s.cpuProfiling {
		return nil, fmt.Errorf("CPU profiling already in progress")
	}

	s.cpuProfileBuf = &bytes.Buffer{}
	s.cpuProfiling = true
	if err := pprof.StartCPUProfile(s.cpuProfileBuf); err != nil {
		s.cpuProfileBuf = nil
		s.cpuProfiling = false
		return nil, fmt.Errorf("start CPU profile: %w", err)
	}

	log.Info("CPU profiling started")
	return &proto.StartCPUProfileResponse{}, nil
}

// StopCPUProfile stops CPU profiling in the daemon.
func (s *Server) StopCPUProfile(_ context.Context, _ *proto.StopCPUProfileRequest) (*proto.StopCPUProfileResponse, error) {
	s.mutex.Lock()
	defer s.mutex.Unlock()

	if !s.cpuProfiling {
		return nil, fmt.Errorf("CPU profiling not in progress")
	}

	pprof.StopCPUProfile()
	s.cpuProfiling = false

	if s.cpuProfileBuf != nil {
		log.Infof("CPU profiling stopped, captured %d bytes", s.cpuProfileBuf.Len())
	}

	return &proto.StopCPUProfileResponse{}, nil
}