package service

import (
	"acc-server-manager/local/model"
	"acc-server-manager/local/repository"
	"acc-server-manager/local/utl/tracking"
	"context"
	"log"
	"path/filepath"
	"sync"
	"time"

	"github.com/gofiber/fiber/v2"
)

type ServerService struct {
	repository       *repository.ServerRepository
	stateHistoryRepo *repository.StateHistoryRepository
	apiService       *ApiService
	instances        sync.Map
	configService    *ConfigService
	lastInsertTimes  sync.Map // Track last insert time per server
	debouncers       sync.Map // Track debounce timers per server
}

type pendingState struct {
	timer *time.Timer
	state *model.ServerState
}

func NewServerService(repository *repository.ServerRepository, stateHistoryRepo *repository.StateHistoryRepository, apiService *ApiService, configService *ConfigService) *ServerService {
	service := &ServerService{
		repository: repository,
		apiService: apiService,
		configService: configService,
		stateHistoryRepo: stateHistoryRepo,
	}
	servers, err := repository.GetAll(context.Background(), &model.ServerFilter{})
	if err != nil {
		log.Print(err.Error())
	}
	for _, server := range *servers {
		status, err := service.apiService.StatusServer(server.ServiceName)
		if err != nil {
			log.Print(err.Error())
		}
		if (status == string(model.StatusRunning)) {
			service.StartAccServerRuntime(&server)
		}
	}
	return service
}

func (s *ServerService) shouldInsertStateHistory(serverID uint) bool {
	insertInterval := 5 * time.Minute // Configure this as needed
	
	lastInsertInterface, exists := s.lastInsertTimes.Load(serverID)
	if !exists {
		s.lastInsertTimes.Store(serverID, time.Now().UTC())
		return true
	}
	
	lastInsert := lastInsertInterface.(time.Time)
	now := time.Now().UTC()
	
	if now.Sub(lastInsert) >= insertInterval {
		s.lastInsertTimes.Store(serverID, now)
		return true
	}
	
	return false
}

func (s *ServerService) insertStateHistory(serverID uint, state *model.ServerState) {
	s.stateHistoryRepo.Insert(context.Background(), &model.StateHistory{
		ServerID:    serverID,
		Session:     state.Session,
		PlayerCount: state.PlayerCount,
		DateCreated: time.Now().UTC(),
	})
}

func (s *ServerService) handleStateChange(server *model.Server, state *model.ServerState) {
	// Cancel existing timer if any
	if debouncer, exists := s.debouncers.Load(server.ID); exists {
		pending := debouncer.(*pendingState)
		pending.timer.Stop()
	}

	// Create new timer
	timer := time.NewTimer(5 * time.Minute)
	s.debouncers.Store(server.ID, &pendingState{
		timer: timer,
		state: state,
	})

	// Start goroutine to handle the delayed insert
	go func() {
		<-timer.C
		if debouncer, exists := s.debouncers.Load(server.ID); exists {
			pending := debouncer.(*pendingState)
			s.insertStateHistory(server.ID, pending.state)
			s.debouncers.Delete(server.ID)
		}
	}()

	// If enough time has passed since last insert, insert immediately
	if s.shouldInsertStateHistory(server.ID) {
		s.insertStateHistory(server.ID, state)
	}
}

func (s *ServerService) StartAccServerRuntime(server *model.Server) {
	s.instances.Delete(server.ID)
    instance := tracking.NewAccServerInstance(server, func(state *model.ServerState, states ...tracking.StateChange) {
		s.handleStateChange(server, state)
	})
	config, _  := DecodeFileName(ConfigurationJson)(server.ConfigPath)
	cfg := config.(model.Configuration)
	event, _  := DecodeFileName(EventJson)(server.ConfigPath)
	evt := event.(model.EventConfig)

	instance.State.MaxConnections = cfg.MaxConnections.ToInt()
	instance.State.Track = evt.Track

	go tracking.TailLogFile(filepath.Join(server.ConfigPath, "\\server\\log\\server.log"), instance.HandleLogLine)
    s.instances.Store(server.ID, instance)
}

// GetAll
// Gets All rows from Server table.
//
//	   	Args:
//	   		context.Context: Application context
//		Returns:
//			string: Application version
func (as ServerService) GetAll(ctx *fiber.Ctx, filter *model.ServerFilter) (*[]model.Server, error) {
	servers, err := as.repository.GetAll(ctx.UserContext(), filter)
	if err != nil {
		return nil, err
	}

	for i, server := range *servers {
		status, err := as.apiService.StatusServer(server.ServiceName)
		if err != nil {
			log.Print(err.Error())
		}
		(*servers)[i].Status = model.ServiceStatus(status)
		instance, ok := as.instances.Load(server.ID)
		if !ok {
			log.Print("Unable to retrieve instance for server of ID: ", server.ID)
		} else {
			serverInstance := instance.(*tracking.AccServerInstance)
			if (serverInstance.State != nil) {
				(*servers)[i].State = *serverInstance.State
			}
		}
	}

	return servers, nil
}

// GetById
// Gets rows by ID from Server table.
//
//	   	Args:
//	   		context.Context: Application context
//		Returns:
//			string: Application version
func (as ServerService) GetById(ctx *fiber.Ctx, serverID int) (*model.Server, error) {
	server, err := as.repository.GetByID(ctx.UserContext(), serverID)
	if err != nil {
		return nil, err
	}
	status, err := as.apiService.StatusServer(server.ServiceName)
	if err != nil {
		log.Print(err.Error())
	}
	server.Status = model.ServiceStatus(status)
	instance, ok := as.instances.Load(server.ID)
	if !ok {
		log.Print("Unable to retrieve instance for server of ID: ", server.ID)
	} else {
		serverInstance := instance.(*tracking.AccServerInstance)
		if (serverInstance.State != nil) {
			server.State = *serverInstance.State
		}
	}

	return server, nil
}