package Messages

import (
	"encoding/base64"
	"encoding/json"
	"fmt"
	"net/http"
	"time"

	"git.tovijaeschke.xyz/tovi/Envelope/Backend/Database"
	"git.tovijaeschke.xyz/tovi/Envelope/Backend/Service"
	"git.tovijaeschke.xyz/tovi/Envelope/Backend/Util"
)

// TODO: Encrypt sender and conversationID metadata + add more
type payload struct {
	Messages       []rawMessageData `json:"messages"`
	Sender         string           `json:"sender"`
	ConversationID string           `json:"conversation_id"`
	Tokens         []string         `json:"tokens"`
}

type rawMessageData struct {
	MessageData Database.MessageData `json:"message_data"`
	Messages    Database.MessageList `json:"message"`
}

// CreateMessage sends a message
func CreateMessage(w http.ResponseWriter, r *http.Request) {
	var (
		messagesData payload
		messageData  rawMessageData
		message      Database.Message
		t            time.Time
		decodedFile  []byte
		fileName     string
		i            int
		err          error
	)

	err = json.NewDecoder(r.Body).Decode(&messagesData)
	if err != nil {
		http.Error(w, "Error", http.StatusInternalServerError)
		return
	}

	for _, messageData = range messagesData.Messages {
		if messageData.MessageData.Data == "" {
			decodedFile, err = base64.StdEncoding.DecodeString(messageData.MessageData.Attachment.Data)
			fileName, err = Util.WriteFile(decodedFile)
			messageData.MessageData.Attachment.FilePath = fileName
		}

		for i, message = range messageData.Messages {
			t, err = time.Parse(time.RFC3339, message.ExpiryRaw)
			if err == nil {
				err = messageData.Messages[i].Expiry.Scan(t)
				if err != nil {
					http.Error(w, "Error", http.StatusInternalServerError)
					return
				}
			}
		}

		err = (&messageData.MessageData).CreateMessageData()
		if err != nil {
			http.Error(w, "Error", http.StatusInternalServerError)
			return
		}

		err = (&messageData.Messages).CreateMessages()
		if err != nil {
			http.Error(w, "Error", http.StatusInternalServerError)
			return
		}
	}

	_ = Service.SendNotification(
		messagesData.Tokens,
		fmt.Sprintf(
			"%s sent a message",
			messagesData.Sender,
		),
		map[string]string{
			"conversation_id": messagesData.ConversationID,
		},
	)

	w.WriteHeader(http.StatusNoContent)
}