package helpers

import (
	"encoding/json"
	"errors"
	"fmt"
	"os"
	"path/filepath"
	"strconv"
	"time"

	"forge.redroom.link/yves/meowlib"
	"forge.redroom.link/yves/meowlib/client"
	"github.com/google/uuid"
	"google.golang.org/protobuf/proto"
)

type ReceivedMessage struct {
	Text          string
	files         []string
	Server        string
	Sent          uint64
	Received      uint64
	LocalUuid     string
	LocalSequence uint64
	AppData       string
	Location      meowlib.Location
}

// CheckForMessages checks for messages on a single server
func CheckForMessages(storage_path string, job *client.RequestsJob) (int, string, error) {

	count := 0

	//fmt.Println(jsonjob)
	// if folder does not exist, create it
	if _, err := os.Stat(filepath.Join(storage_path, "inbox")); os.IsNotExist(err) {
		err := os.MkdirAll(filepath.Join(storage_path, "inbox"), 0700)
		if err != nil {
			return -1, "CheckMessages: MkdirAll", err
		}
	}
	//convert server to a server object

	var crl []*meowlib.ConversationRequest
	// build conversation requests
	if job.LookupKeys != nil {
		for _, key := range job.LookupKeys {
			var cr meowlib.ConversationRequest
			cr.LookupKey = key.Public
			cr.SendTimestamp = time.Now().UTC().Unix()
			// todo sign it
			//cr.LookupSignature =
			crl = append(crl, &cr)
		}
		// get server public key
		if job.Server.PublicKey == "" {
			key, err := meowlib.HttpGetId(job.Server.Url)
			if err != nil {
				return -1, "CheckMessages: HttpGetId", err
			}
			job.Server.PublicKey = key["publicKey"]
		}
		// build server message
		var toSrv meowlib.ToServerMessage
		toSrv.PullRequest = crl
		toSrv.From = job.Server.UserKp.Public
		data, err := job.Server.ProcessOutboundMessage(&toSrv)
		if err != nil {
			return -1, "CheckMessages: ProcessOutboundMessage", err
		}

		response, err := meowlib.HttpPostMessage(job.Server.Url, data)
		if err != nil {
			return -1, "CheckMessages: httpPostMessage", err
		}
		fs_msg, err := job.Server.ProcessInboundServerResponse(response)
		if err != nil {
			return -1, "CheckMessages: ProcessInboundServerResponse", err
		}
		if len(fs_msg.Chat) == 0 && fs_msg.Invitation == nil {

			// todo: manage non usermessage, like serverlists

		} else { // chat or invitation answer => save the server message

			out, err := proto.Marshal(fs_msg)
			if err != nil {
				return -1, "CheckMessages: protobuf marshal", err
			}
			if err := os.WriteFile(filepath.Join(storage_path, "inbox", strconv.FormatInt(time.Now().UTC().UnixNano(), 10)), out, 0644); err != nil {
				return -1, "CheckMessages: WriteFile", err
			}
		}
		count = len(fs_msg.Chat)
	}

	return count, "", nil
}

// SaveCheckJobs
func SaveCheckJobs() (string, error) {
	me := client.GetConfig().GetIdentity()
	err := me.SaveBackgroundJob()
	if err != nil {

		return "CheckMessages: json.Marshal", err
	}
	return "", nil
}

// ReadMessage
func ReadMessage(messageFilename string, detachFilesStoragePath string) ([]string, []string, string, error) {

	messagesOverview := []string{}
	filenames := []string{}
	identity := client.GetConfig().GetIdentity()
	// read message file
	msg, err := os.ReadFile(messageFilename)
	if err != nil {
		return nil, nil, "ReadMessage: ReadFile", err
	}
	// protobuf unmarshal message
	var fromServerMessage meowlib.FromServerMessage
	err = proto.Unmarshal(msg, &fromServerMessage)
	if err != nil {
		return nil, nil, "ReadMessage: Unmarshal FromServerMessage", err
	}
	// check if invitation answer
	if fromServerMessage.Invitation != nil {
		InvitationGetAnswerReadResponse(fromServerMessage.Invitation)
	}
	// Chat messages
	if len(fromServerMessage.Chat) > 0 {
		for _, packedUserMessage := range fromServerMessage.Chat {

			// find the peer with that lookup key
			peer := identity.Peers.GetFromMyLookupKey(packedUserMessage.Destination)
			if peer == nil {
				return nil, nil, "ReadMessage: GetFromMyLookupKey", errors.New("no visible peer for that message")
			}
			// Unpack the message
			usermsg, err := peer.ProcessInboundUserMessage(packedUserMessage.Payload, packedUserMessage.Signature)
			if err != nil {
				return nil, nil, "ReadMessage: ProcessInboundUserMessage", err
			}

			fmt.Println("From:", usermsg.From)
			jsonUserMessage, _ := json.Marshal(usermsg)
			fmt.Println(string(jsonUserMessage))
			// detach files

			if usermsg.Files != nil {
				for _, file := range usermsg.Files {
					filename := uuid.New().String() + "_" + file.Filename
					filenames = append(filenames, filename)
					// detach file
					os.WriteFile(filepath.Join(detachFilesStoragePath, "files", filename), file.Data, 0600)
				}
				//? result["invitation finalized"] = peer.Name
			}
			// user message
			messagesOverview = append(messagesOverview, usermsg.From+" > "+string(usermsg.Data))
			// add message to storage
			err = peer.StoreMessage(usermsg, filenames)
			if err != nil {
				return nil, nil, "ReadMessage: StoreMessage", err
			}

		}

	}

	// fmt.Println("have read fromServerMessage, will unmarshal packed")
	// // protobuf unmarshal message //! WRONG !!!!
	// var packedMessage meowlib.PackedUserMessage
	// err = proto.Unmarshal(userMessage, &packedMessage)
	// if err != nil {
	// 	return C.CString(errorToJson(err, "ReadMessage: Unmarshal PackedUserMessage"))
	// }
	// fmt.Println("Destination:", packedMessage.Destination)
	// fmt.Println("Payload lengh:", len(packedMessage.Pay ""load))
	// server invitation finalize or more ?
	/*
		if fromServerMessage.Invitation != nil {
			fmt.Println("Invitation from:", fromServerMessage.Invitation.From)
			// find the peer with that lookup key
			// todo  get from invitation id
			//! FOLOWING statement is WRONG !
			peer := client.GetConfig().GetIdentity().Peers.GetFromPublicKey(fromServerMessage.Invitation.From)
			if peer == nil {
				return nil, nil, "ReadMessage: GetFromPublicKey", errors.New("no visible peer for that message")
			}
			peer.ContactPublicKey = fromServerMessage.Invitation.From
			str, _ := json.Marshal(peer)
			fmt.Println("Peer:", string(str))
			// invitation message
			var receivedContactCard meowlib.ContactCard
			err := proto.Unmarshal(fromServerMessage.Invitation.Payload, &receivedContactCard)
			if err != nil {
				return "", "ReadMessage: Unmarshal ContactCard", err
			}
			err = client.GetConfig().GetIdentity().FinalizeInvitation(&receivedContactCard)
			if err != nil {
				return "", "ReadMessage: FinalizeInvitation", err
			}
			result["invitation finalized"] = peer.Name


		}*/

	// message
	// including list of detached files
	return messagesOverview, filenames, "", nil
}