package repository

import (
	"errors"
	"fmt"

	"joylink.club/rtsssimulation/repository/model/proto"
)

// 物理区段
type PhysicalSection struct {
	Identity

	len         int32         //长度 mm
	checkPoints []*CheckPoint //将此区段分隔出来的所有(非区段边界)检测点

	// A/B端关联的设备端口（非道岔物理区段/道岔）
	aRelation DevicePort
	bRelation DevicePort

	// 非道岔物理区段A/B端的公里标
	aKm *proto.Kilometer
	bKm *proto.Kilometer

	turnouts []*Turnout //道岔物理区段关联的道岔

	// 关联的设备(目前有信号机、应答器、(非区段边界)检测点）
	devices []Identity

	//aKm/bKm对应的LinkPosition
	aLinkPosition *LinkPosition
	bLinkPosition *LinkPosition
	//在Link上的区间（根据aKm和bKm计算出的，start的offset一定小于end的offset）
	startLinkPosition *LinkPosition
	endLinkPosition   *LinkPosition
}

func NewPhysicalSection(id string) *PhysicalSection {
	return &PhysicalSection{
		Identity: identity{id, proto.DeviceType_DeviceType_PhysicalSection},
	}
}

func (s *PhysicalSection) PortNum() int {
	return 2
}

func (s *PhysicalSection) ALinkPosition() *LinkPosition {
	return s.aLinkPosition
}

func (s *PhysicalSection) BLinkPosition() *LinkPosition {
	return s.bLinkPosition
}

func (s *PhysicalSection) StartLinkPosition() *LinkPosition {
	return s.startLinkPosition
}

func (s *PhysicalSection) EndLinkPosition() *LinkPosition {
	return s.endLinkPosition
}

func (s *PhysicalSection) ARelation() DevicePort {
	return s.aRelation
}

func (s *PhysicalSection) BRelation() DevicePort {
	return s.bRelation
}

func (s *PhysicalSection) AKilometer() *proto.Kilometer {
	return s.aKm
}

func (s *PhysicalSection) BKilometer() *proto.Kilometer {
	return s.bKm
}

func (s *PhysicalSection) bindDevicePort(port proto.Port, devicePort DevicePort) error {
	_, isSectionPort := devicePort.(*PhysicalSectionPort)
	_, isTurnoutPort := devicePort.(*TurnoutPort)
	if !isSectionPort && !isTurnoutPort {
		return errors.New(fmt.Sprintf("物理区段不能与[%s]类型的设备端口关联", devicePort.Device().Type()))
	}
	switch port {
	case proto.Port_A:
		s.aRelation = devicePort
	case proto.Port_B:
		s.bRelation = devicePort
	default:
		return errors.New(fmt.Sprintf("物理区段无端口[%s]", port))
	}
	return nil
}

// 绑定区段边界公里标。（仅限非道岔物理区段调用）
func (s *PhysicalSection) bindBoundaryKm(km *proto.Kilometer, port proto.Port) error {
	switch port {
	case proto.Port_A:
		s.aKm = km
	case proto.Port_B:
		s.bKm = km
	default:
		return errors.New(fmt.Sprintf("区段无端口[%s]", port))
	}
	return nil
}

// 道岔物理区段绑定道岔
func (s *PhysicalSection) bindTurnouts(turnouts ...*Turnout) {
	for _, turnout := range turnouts {
		s.turnouts = append(s.turnouts, turnout)
		for _, cp := range turnout.checkPoints() {
			s.bindDevices(cp)
		}
	}
}

func (s *PhysicalSection) bindDevices(devices ...Identity) {
	for _, device := range devices {
		s.devices = append(s.devices, device)
		cp, ok := device.(*CheckPoint)
		if ok {
			s.checkPoints = append(s.checkPoints, cp)
		}
	}
}

func (s *PhysicalSection) findOtherDevicePort(port proto.Port) DevicePort {
	switch port {
	case proto.Port_A:
		return s.bRelation
	case proto.Port_B:
		return s.aRelation
	}
	return nil
}

func (s *PhysicalSection) findOtherBoundaryKmByPort(port proto.Port) *proto.Kilometer {
	switch port {
	case proto.Port_A:
		return s.bKm
	case proto.Port_B:
		return s.aKm
	}
	return nil
}

func (s *PhysicalSection) findBoundaryKmByPort(port proto.Port) *proto.Kilometer {
	switch port {
	case proto.Port_A:
		return s.aKm
	case proto.Port_B:
		return s.bKm
	}
	return nil
}

type PhysicalSectionPort struct {
	section *PhysicalSection
	port    proto.Port
}

func (p *PhysicalSectionPort) Port() proto.Port {
	return p.port
}

func (p *PhysicalSectionPort) Device() PortedDevice {
	return p.section
}