package Seeder

import (
	"encoding/base64"
	"fmt"

	"git.tovijaeschke.xyz/tovi/Envelope/Backend/Database"
	"git.tovijaeschke.xyz/tovi/Envelope/Backend/Models"
	"git.tovijaeschke.xyz/tovi/Envelope/Backend/Util"
	"github.com/gofrs/uuid"
)

func seedMessage(
	primaryUser, secondaryUser Models.User,
	primaryUserThreadKey, secondaryUserThreadKey string,
	thread Models.ConversationDetail,
	i int,
) error {
	var (
		message            Models.Message
		messageData        Models.MessageData
		key                aesKey
		plaintext          string
		dataCiphertext     []byte
		senderIdCiphertext []byte
		err                error
	)

	key, err = generateAesKey()
	if err != nil {
		panic(err)
	}

	plaintext = "Test Message"

	dataCiphertext, err = key.aesEncrypt([]byte(plaintext))
	if err != nil {
		panic(err)
	}

	senderIdCiphertext, err = key.aesEncrypt([]byte(primaryUser.ID.String()))
	if err != nil {
		panic(err)
	}

	if i%2 == 0 {
		senderIdCiphertext, err = key.aesEncrypt([]byte(secondaryUser.ID.String()))
		if err != nil {
			panic(err)
		}
	}

	messageData = Models.MessageData{
		Data:     base64.StdEncoding.EncodeToString(dataCiphertext),
		SenderID: base64.StdEncoding.EncodeToString(senderIdCiphertext),
	}

	message = Models.Message{
		MessageData: messageData,
		SymmetricKey: base64.StdEncoding.EncodeToString(
			encryptWithPublicKey(key.Key, decodedPublicKey),
		),
		MessageThreadKey: primaryUserThreadKey,
	}

	err = Database.CreateMessage(&message)
	if err != nil {
		return err
	}

	// The symmetric key would be encrypted with secondary users public key in production
	// But due to using the same pub/priv key pair for all users, we will just duplicate it
	message = Models.Message{
		MessageDataID: message.MessageDataID,
		SymmetricKey: base64.StdEncoding.EncodeToString(
			encryptWithPublicKey(key.Key, decodedPublicKey),
		),
		MessageThreadKey: secondaryUserThreadKey,
	}

	err = Database.CreateMessage(&message)
	if err != nil {
		return err
	}

	return err
}

func seedConversationDetail(key aesKey) (Models.ConversationDetail, error) {
	var (
		messageThread  Models.ConversationDetail
		name           string
		nameCiphertext []byte
		err            error
	)

	name = "Test Conversation"

	nameCiphertext, err = key.aesEncrypt([]byte(name))
	if err != nil {
		panic(err)
	}

	messageThread = Models.ConversationDetail{
		Name: base64.StdEncoding.EncodeToString(nameCiphertext),
	}

	err = Database.CreateConversationDetail(&messageThread)
	return messageThread, err
}

func seedUpdateUserConversation(
	userJson string,
	key aesKey,
	messageThread Models.ConversationDetail,
) (Models.ConversationDetail, error) {
	var (
		usersCiphertext []byte
		err             error
	)

	usersCiphertext, err = key.aesEncrypt([]byte(userJson))
	if err != nil {
		return messageThread, err
	}

	messageThread.Users = base64.StdEncoding.EncodeToString(usersCiphertext)
	err = Database.UpdateConversationDetail(&messageThread)
	return messageThread, err
}

func seedUserConversation(
	user Models.User,
	threadID uuid.UUID,
	messageThreadKey string,
	key aesKey,
) (Models.UserConversation, error) {
	var (
		messageThreadUser  Models.UserConversation
		threadIdCiphertext []byte
		keyCiphertext      []byte
		adminCiphertext    []byte
		err                error
	)

	threadIdCiphertext, err = key.aesEncrypt([]byte(threadID.String()))
	if err != nil {
		return messageThreadUser, err
	}

	keyCiphertext, err = key.aesEncrypt([]byte(messageThreadKey))
	if err != nil {
		return messageThreadUser, err
	}

	adminCiphertext, err = key.aesEncrypt([]byte("true"))
	if err != nil {
		return messageThreadUser, err
	}

	messageThreadUser = Models.UserConversation{
		UserID:               user.ID,
		ConversationDetailID: base64.StdEncoding.EncodeToString(threadIdCiphertext),
		MessageThreadKey:     base64.StdEncoding.EncodeToString(keyCiphertext),
		Admin:                base64.StdEncoding.EncodeToString(adminCiphertext),
		SymmetricKey: base64.StdEncoding.EncodeToString(
			encryptWithPublicKey(key.Key, decodedPublicKey),
		),
	}

	err = Database.CreateUserConversation(&messageThreadUser)
	return messageThreadUser, err
}

func SeedMessages() {
	var (
		messageThread          Models.ConversationDetail
		key                    aesKey
		primaryUser            Models.User
		primaryUserThreadKey   string
		secondaryUser          Models.User
		secondaryUserThreadKey string

		userJson string

		thread Models.ConversationDetail
		i      int
		err    error
	)

	key, err = generateAesKey()
	messageThread, err = seedConversationDetail(key)
	primaryUserThreadKey = Util.RandomString(32)
	secondaryUserThreadKey = Util.RandomString(32)

	primaryUser, err = Database.GetUserByUsername("testUser")
	if err != nil {
		panic(err)
	}

	_, err = seedUserConversation(
		primaryUser,
		messageThread.ID,
		primaryUserThreadKey,
		key,
	)

	secondaryUser, err = Database.GetUserByUsername("testUser2")
	if err != nil {
		panic(err)
	}

	_, err = seedUserConversation(
		secondaryUser,
		messageThread.ID,
		secondaryUserThreadKey,
		key,
	)

	userJson = fmt.Sprintf(
		`
[
	{
		"id": "%s",
		"username": "%s",
		"admin": "true"
	},
	{
		"id": "%s",
		"username": "%s",
		"admin": "true"
	}
]
		`,
		primaryUser.ID.String(),
		primaryUser.Username,
		secondaryUser.ID.String(),
		secondaryUser.Username,
	)

	messageThread, err = seedUpdateUserConversation(
		userJson,
		key,
		messageThread,
	)

	for i = 0; i <= 20; i++ {
		err = seedMessage(
			primaryUser,
			secondaryUser,
			primaryUserThreadKey,
			secondaryUserThreadKey,
			thread,
			i,
		)
		if err != nil {
			panic(err)
		}
	}
}