// Package model define model struct of model runtime service
package model

import (
	"encoding/json"
	"fmt"
	"strconv"
	"strings"

	"modelRT/constants"
)

// MeasurementDataSource define measurement data source struct
type MeasurementDataSource struct {
	Type      int       `json:"type"`
	IOAddress IOAddress `json:"io_address"`
}

// IOAddress define interface of IO address
type IOAddress interface{}

// CL3611Address define CL3611 protol struct
type CL3611Address struct {
	Station string `json:"station"`
	Device  string `json:"device"`
	Channel string `json:"channel"`
}

// Power104Address define electricity 104 protol struct
type Power104Address struct {
	Station string `json:"station"`
	Packet  int    `json:"packet"`
	Offset  int    `json:"offset"`
}

// NewCL3611DataSource define func of create CL3611 data source
func NewCL3611DataSource(station, device, channel string) (*MeasurementDataSource, error) {
	return &MeasurementDataSource{
		Type: constants.DataSourceTypeCL3611,
		IOAddress: CL3611Address{
			Station: station,
			Device:  device,
			Channel: channel,
		},
	}, nil
}

// NewPower104DataSource define func of create Power104 data source
func NewPower104DataSource(station string, packet, offset int) (*MeasurementDataSource, error) {
	return &MeasurementDataSource{
		Type: constants.DataSourceTypePower104,
		IOAddress: Power104Address{
			Station: station,
			Packet:  packet,
			Offset:  offset,
		},
	}, nil
}

func generateChannelName(prefix string, number int, suffix string) (string, error) {
	switch prefix {
	case constants.ChannelPrefixTelemetry:
		if number > 10 {
			return "", constants.ErrExceedsLimitType
		}
		var builder strings.Builder
		numberStr := strconv.Itoa(number)
		builder.Grow(len(prefix) + len(numberStr) + len(suffix))
		builder.WriteString(prefix)
		builder.WriteString(numberStr)
		builder.WriteString(suffix)
		channelName := builder.String()
		return channelName, nil
	case constants.ChannelPrefixTelesignal:
		var numberStr string
		if number < 10 {
			numberStr = "0" + strconv.Itoa(number)
		}
		numberStr = strconv.Itoa(number)

		var builder strings.Builder
		builder.Grow(len(prefix) + len(numberStr) + len(suffix))
		builder.WriteString(prefix)
		builder.WriteString(numberStr)
		builder.WriteString(suffix)
		channelName := builder.String()
		return channelName, nil
	default:
		return "", constants.ErrUnsupportedChannelPrefixType
	}
}

// NewTelemetryChannel define func of generate telemetry channel CL3611 data source
func NewTelemetryChannel(station, device, channelNameSuffix string, channelNumber int) (*MeasurementDataSource, error) {
	channelName, err := generateChannelName(constants.ChannelPrefixTelemetry, channelNumber, channelNameSuffix)
	if err != nil {
		return nil, fmt.Errorf("failed to generate channel name: %w", err)
	}
	return NewCL3611DataSource(station, device, channelName)
}

// NewTelesignalChannel  define func of generate telesignal channel CL3611 data source
func NewTelesignalChannel(station, device, channelNameSuffix string, channelNumber int) (*MeasurementDataSource, error) {
	channelName, err := generateChannelName(constants.ChannelPrefixTelesignal, channelNumber, channelNameSuffix)
	if err != nil {
		return nil, fmt.Errorf("failed to generate channel name: %w", err)
	}
	return NewCL3611DataSource(station, device, channelName)
}

// NewStandardChannel define func of generate standard channel CL3611 data source
func NewStandardChannel(station, device, channelType string) (*MeasurementDataSource, error) {
	return NewCL3611DataSource(station, device, channelType)
}

// ParseDataSourceFromJSON define func of parse data source from json string
func ParseDataSourceFromJSON(jsonStr string) (MeasurementDataSource, error) {
	var data struct {
		Type      int             `json:"type"`
		IOAddress json.RawMessage `json:"io_address"`
	}

	if err := json.Unmarshal([]byte(jsonStr), &data); err != nil {
		return MeasurementDataSource{}, err
	}

	var source MeasurementDataSource
	source.Type = data.Type

	switch data.Type {
	case constants.DataSourceTypeCL3611:
		var addr CL3611Address
		if err := json.Unmarshal(data.IOAddress, &addr); err != nil {
			return MeasurementDataSource{}, err
		}
		source.IOAddress = addr
	case constants.DataSourceTypePower104:
		var addr Power104Address
		if err := json.Unmarshal(data.IOAddress, &addr); err != nil {
			return MeasurementDataSource{}, err
		}
		source.IOAddress = addr
	default:
		// 对于未知类型，保持原始JSON数据
		source.IOAddress = data.IOAddress
	}

	return source, nil
}

// ToJSON define func of convert data source to json string
func (m MeasurementDataSource) ToJSON() (string, error) {
	bytes, err := json.Marshal(m)
	if err != nil {
		return "", err
	}
	return string(bytes), nil
}

// GetIOAddress define func of get IO address with correct type
func (m MeasurementDataSource) GetIOAddress() (IOAddress, error) {
	switch m.Type {
	case constants.DataSourceTypeCL3611:
		if addr, ok := m.IOAddress.(CL3611Address); ok {
			return addr, nil
		}
		return nil, constants.ErrInvalidAddressType
	case constants.DataSourceTypePower104:
		if addr, ok := m.IOAddress.(Power104Address); ok {
			return addr, nil
		}
		return nil, constants.ErrInvalidAddressType
	default:
		return nil, constants.ErrUnknownDataType
	}
}