// SPDX-FileCopyrightText: 2023 The Pion community <https://pion.ly>
// SPDX-License-Identifier: MIT

package webrtc

import (
	"fmt"

	"github.com/pion/ice/v4"
)

func supportedNetworkTypes() []NetworkType {
	return []NetworkType{
		NetworkTypeUDP4,
		NetworkTypeUDP6,
		// NetworkTypeTCP4, // Not supported yet
		// NetworkTypeTCP6, // Not supported yet
	}
}

// NetworkType represents the type of network.
type NetworkType int

const (
	// NetworkTypeUnknown is the enum's zero-value.
	NetworkTypeUnknown NetworkType = iota

	// NetworkTypeUDP4 indicates UDP over IPv4.
	NetworkTypeUDP4

	// NetworkTypeUDP6 indicates UDP over IPv6.
	NetworkTypeUDP6

	// NetworkTypeTCP4 indicates TCP over IPv4.
	NetworkTypeTCP4

	// NetworkTypeTCP6 indicates TCP over IPv6.
	NetworkTypeTCP6
)

// This is done this way because of a linter.
const (
	networkTypeUDP4Str = "udp4"
	networkTypeUDP6Str = "udp6"
	networkTypeTCP4Str = "tcp4"
	networkTypeTCP6Str = "tcp6"
)

func (t NetworkType) String() string {
	switch t {
	case NetworkTypeUDP4:
		return networkTypeUDP4Str
	case NetworkTypeUDP6:
		return networkTypeUDP6Str
	case NetworkTypeTCP4:
		return networkTypeTCP4Str
	case NetworkTypeTCP6:
		return networkTypeTCP6Str
	default:
		return ErrUnknownType.Error()
	}
}

// Protocol returns udp or tcp.
func (t NetworkType) Protocol() string { //nolint:staticcheck
	switch t {
	case NetworkTypeUDP4:
		return "udp"
	case NetworkTypeUDP6:
		return "udp"
	case NetworkTypeTCP4:
		return "tcp"
	case NetworkTypeTCP6:
		return "tcp"
	default:
		return ErrUnknownType.Error()
	}
}

// NewNetworkType allows create network type from string
// It will be useful for getting custom network types from external config.
func NewNetworkType(raw string) (NetworkType, error) {
	switch raw {
	case networkTypeUDP4Str:
		return NetworkTypeUDP4, nil
	case networkTypeUDP6Str:
		return NetworkTypeUDP6, nil
	case networkTypeTCP4Str:
		return NetworkTypeTCP4, nil
	case networkTypeTCP6Str:
		return NetworkTypeTCP6, nil
	default:
		return NetworkTypeUnknown, fmt.Errorf("%w: %s", errNetworkTypeUnknown, raw)
	}
}

func getNetworkType(iceNetworkType ice.NetworkType) (NetworkType, error) {
	switch iceNetworkType {
	case ice.NetworkTypeUDP4:
		return NetworkTypeUDP4, nil
	case ice.NetworkTypeUDP6:
		return NetworkTypeUDP6, nil
	case ice.NetworkTypeTCP4:
		return NetworkTypeTCP4, nil
	case ice.NetworkTypeTCP6:
		return NetworkTypeTCP6, nil
	default:
		return NetworkTypeUnknown, fmt.Errorf("%w: %s", errNetworkTypeUnknown, iceNetworkType.String())
	}
}

func toICENetworkTypes(networkTypes []NetworkType) []ice.NetworkType {
	if len(networkTypes) == 0 {
		return nil
	}

	converted := make([]ice.NetworkType, 0, len(networkTypes))
	for _, networkType := range networkTypes {
		converted = append(converted, networkType.toICE())
	}

	return converted
}

func (networkType NetworkType) toICE() ice.NetworkType {
	return ice.NetworkType(networkType)
}
