package hotline

import (
	"encoding/binary"
	"github.com/jhalter/mobius/concat"
)

// List of Hotline protocol field types taken from the official 1.9 protocol document
const (
	FieldError               = 100
	FieldData                = 101
	FieldUserName            = 102
	FieldUserID              = 103
	FieldUserIconID          = 104
	FieldUserLogin           = 105
	FieldUserPassword        = 106
	FieldRefNum              = 107
	FieldTransferSize        = 108
	FieldChatOptions         = 109
	FieldUserAccess          = 110
	FieldUserAlias           = 111 // TODO: implement
	FieldUserFlags           = 112
	FieldOptions             = 113
	FieldChatID              = 114
	FieldChatSubject         = 115
	FieldWaitingCount        = 116
	FieldBannerType          = 152
	FieldNoServerAgreement   = 152
	FieldVersion             = 160
	FieldCommunityBannerID   = 161
	FieldServerName          = 162
	FieldFileNameWithInfo    = 200
	FieldFileName            = 201
	FieldFilePath            = 202
	FieldFileResumeData      = 203
	FieldFileTransferOptions = 204
	FieldFileTypeString      = 205
	FieldFileCreatorString   = 206
	FieldFileSize            = 207
	FieldFileCreateDate      = 208
	FieldFileModifyDate      = 209
	FieldFileComment         = 210
	FieldFileNewName         = 211
	FieldFileNewPath         = 212
	FieldFileType            = 213
	FieldQuotingMsg          = 214
	FieldAutomaticResponse   = 215
	FieldFolderItemCount     = 220
	FieldUsernameWithInfo    = 300
	FieldNewsArtListData     = 321
	FieldNewsCatName         = 322
	FieldNewsCatListData15   = 323
	FieldNewsPath            = 325
	FieldNewsArtID           = 326
	FieldNewsArtDataFlav     = 327
	FieldNewsArtTitle        = 328
	FieldNewsArtPoster       = 329
	FieldNewsArtDate         = 330
	FieldNewsArtPrevArt      = 331
	FieldNewsArtNextArt      = 332
	FieldNewsArtData         = 333
	FieldNewsArtFlags        = 334 // TODO: what is this used for?
	FieldNewsArtParentArt    = 335
	FieldNewsArt1stChildArt  = 336
	FieldNewsArtRecurseDel   = 337 // TODO: implement news article recusive deletion
)

type Field struct {
	ID        []byte // Type of field
	FieldSize []byte // Size of the data part
	Data      []byte // Actual field content
}

type requiredField struct {
	ID     int
	minLen int
	maxLen int
}

func NewField(id uint16, data []byte) Field {
	idBytes := make([]byte, 2)
	binary.BigEndian.PutUint16(idBytes, id)

	bs := make([]byte, 2)
	binary.BigEndian.PutUint16(bs, uint16(len(data)))

	return Field{
		ID:        idBytes,
		FieldSize: bs,
		Data:      data,
	}
}

func (f Field) Payload() []byte {
	return concat.Slices(f.ID, f.FieldSize, f.Data)
}

func getField(id int, fields *[]Field) *Field {
	for _, field := range *fields {
		if id == int(binary.BigEndian.Uint16(field.ID)) {
			return &field
		}
	}
	return nil
}