package storage

import (
	"database/sql"
	"encoding/json"
	"fmt"
	_ "github.com/lib/pq"
	"github.com/spf13/viper"
	"regexp"
	"strconv"
	"strings"
)

type PostgresqlStorage struct {
	DbConnection *sql.DB
}

func NewPostgresqlStorage(cfg *viper.Viper) (PostgresqlStorage, error) {
	var (
		host     = cfg.GetString("storage.db.psql.host")
		port     = cfg.GetString("storage.db.psql.port")
		user     = cfg.GetString("storage.db.psql.user")
		password = cfg.GetString("storage.db.psql.password")
		dbname   = cfg.GetString("storage.db.psql.dbname")
	)
	portInt, _ := strconv.Atoi(port)
	psqlconn := fmt.Sprintf("host=%s port=%d user=%s password=%s dbname=%s sslmode=disable", host, portInt,
		user, password, dbname)
	db, err := sql.Open("postgres", psqlconn)
	if err != nil {
		fmt.Println("error", err)
		return PostgresqlStorage{}, fmt.Errorf("connection to postgresql failed")
	}
	err = db.Ping()
	if err != nil {
		return PostgresqlStorage{}, fmt.Errorf("connection to postgresql database failed")
	}
	return PostgresqlStorage{
		DbConnection: db,
	}, nil
}

func (psql PostgresqlStorage) GetAccount(id string) (*Account, error) {
	var (
		data, metadata, emailValidation, phoneValidation []byte
	)
	account := &Account{}
	if isUUIDv4(id) {
		stmtAccounts, err := psql.DbConnection.Prepare("SELECT id, namespace, data, metadata FROM accounts WHERE id = $1")
		if err != nil {
			return nil, fmt.Errorf("psql connection failed")
		}
		defer stmtAccounts.Close()
		err = stmtAccounts.QueryRow(id).Scan(&account.ID, &account.Namespace, &data, &metadata)
		if err != nil {
			return nil, fmt.Errorf("psql select account query failed")
		}
		err = json.Unmarshal(data, &account.Data)
		if err != nil {
			return nil, err
		}
		err = json.Unmarshal(metadata, &account.Metadata)
		if err != nil {
			return nil, err
		}
		stmtAccount_auth, err := psql.DbConnection.Prepare("SELECT username, password, email, email_validation, phone_number, phone_number_validation FROM account_auth WHERE account_id= $1")
		if err != nil {
			return nil, fmt.Errorf("psql connection failed")
		}
		defer stmtAccount_auth.Close()
		err = stmtAccount_auth.QueryRow(id).Scan(&account.Authentication.Local.Username,
			&account.Authentication.Local.Password,
			&account.Authentication.Local.Email,
			&emailValidation,
			&account.Authentication.Local.PhoneNumber,
			&phoneValidation)
		if err != nil {
			return nil, fmt.Errorf("psql select account auth query failed")
		}
		err = json.Unmarshal(emailValidation, &account.Authentication.Local.EmailValidation)
		if err != nil {
			return nil, err
		}
		err = json.Unmarshal(phoneValidation, &account.Authentication.Local.PhoneNumberValidation)
		if err != nil {
			return nil, err
		}
	}
	return account, nil
}

func (psql PostgresqlStorage) LocalAuthentication(namespace string, username string, email string, phone_number string) (*Account, error) {
	account := &Account{}
	var (
		data, metadata, emailValidation, phoneValidation []byte
	)
	if username != "" {
		usernameStmt, err := psql.DbConnection.Prepare("SELECT id, namespace, data, metadata, username, password, email, email_validation, phone_number, phone_number_validation FROM accounts INNER JOIN account_auth ON accounts.id = account_auth.account_id WHERE namespace = $1 AND username = $2;")
		if err != nil {
			return nil, err
		}
		err = usernameStmt.QueryRow(namespace, username).Scan(&account.ID, &account.Namespace, &data, &metadata, &account.Authentication.Local.Username,
			&account.Authentication.Local.Password, &account.Authentication.Local.Email, &emailValidation, &account.Authentication.Local.PhoneNumber, &phoneValidation)
		if err != nil {
			return nil, err
		}
		err = json.Unmarshal(metadata, &account.Metadata)
		if err != nil {
			return nil, err
		}
		err = json.Unmarshal(data, &account.Data)
		if err != nil {
			return nil, err
		}
		err = json.Unmarshal(emailValidation, &account.Authentication.Local.EmailValidation)
		if err != nil {
			return nil, err
		}
		err = json.Unmarshal(phoneValidation, &account.Authentication.Local.PhoneNumberValidation)
		if err != nil {
			return nil, err
		}
		return account, nil
	} else if email != "" {
		account.Authentication.Local.Email = email
		emailStmt, err := psql.DbConnection.Prepare("SELECT id, namespace, data, metadata, username, password, email_validation, phone_number, phone_number_validation FROM accounts INNER JOIN account_auth ON accounts.id = account_auth.account_id WHERE namespace = $1 AND email = $2;")
		if err != nil {
			return nil, err
		}
		err = emailStmt.QueryRow(namespace, email).Scan(&account.ID, &account.Namespace, &data, &metadata, &account.Authentication.Local.Username,
			&account.Authentication.Local.Password, &emailValidation, &account.Authentication.Local.PhoneNumber, &phoneValidation)
		if err != nil {
			return nil, err
		}
		err = json.Unmarshal(metadata, &account.Metadata)
		if err != nil {
			return nil, err
		}
		err = json.Unmarshal(data, &account.Data)
		if err != nil {
			return nil, err
		}
		err = json.Unmarshal(emailValidation, &account.Authentication.Local.EmailValidation)
		if err != nil {
			return nil, err
		}
		err = json.Unmarshal(phoneValidation, &account.Authentication.Local.PhoneNumberValidation)
		if err != nil {
			return nil, err
		}
		return account, nil
	} else if phone_number != "" {
		account.Authentication.Local.PhoneNumber = phone_number
		phoneStmt, err := psql.DbConnection.Prepare("SELECT id, namespace, data, metadata, username, password, email, email_validation, phone_number_validation FROM accounts INNER JOIN account_auth ON accounts.id = account_auth.account_id WHERE namespace = $1 AND phone_number = $2;")
		if err != nil {
			return nil, err
		}
		err = phoneStmt.QueryRow(namespace, phone_number).Scan(&account.ID, &account.Namespace, &data, &metadata, &account.Authentication.Local.Username,
			&account.Authentication.Local.Password, &account.Authentication.Local.Email, &emailValidation, &phoneValidation)
		if err != nil {
			return nil, err
		}
		err = json.Unmarshal(metadata, &account.Metadata)
		if err != nil {
			return nil, err
		}
		err = json.Unmarshal(data, &account.Data)
		if err != nil {
			return nil, err
		}
		err = json.Unmarshal(emailValidation, &account.Authentication.Local.EmailValidation)
		if err != nil {
			return nil, err
		}
		err = json.Unmarshal(phoneValidation, &account.Authentication.Local.PhoneNumberValidation)
		if err != nil {
			return nil, err
		}
		return account, nil
	}
	return account, nil
}

func (psql PostgresqlStorage) GetAccounts(namespaces []string) ([]Account, error) {
	var accounts []Account
	namespacesStr := "'" + strings.Join(namespaces, "', '") + "'"
	query := `
        SELECT accounts.id, accounts.namespace, accounts.data, accounts.metadata,
               account_auth.username, account_auth.password,
               account_auth.email, account_auth.email_validation,
               account_auth.phone_number, account_auth.phone_number_validation
        FROM accounts
        INNER JOIN account_auth ON accounts.id = account_auth.account_id
        WHERE accounts.namespace IN (%s)
    `
	query = fmt.Sprintf(query, namespacesStr)
	rows, err := psql.DbConnection.Query(query)
	if err != nil {
		return nil, err
	}
	defer rows.Close()
	for rows.Next() {
		var account Account
		var dataBytes []byte
		var metadataBytes []byte
		var emailValidationBytes []byte
		var phoneNumberValidationBytes []byte
		err := rows.Scan(
			&account.ID,
			&account.Namespace,
			&dataBytes,
			&metadataBytes,
			&account.Authentication.Local.Username,
			&account.Authentication.Local.Password,
			&account.Authentication.Local.Email,
			&emailValidationBytes,
			&account.Authentication.Local.PhoneNumber,
			&phoneNumberValidationBytes,
		)
		if err != nil {
			return nil, err
		}

		err = json.Unmarshal(dataBytes, &account.Data)
		if err != nil {
			return nil, err
		}

		err = json.Unmarshal(metadataBytes, &account.Metadata)
		if err != nil {
			return nil, err
		}
		err = json.Unmarshal(emailValidationBytes, &account.Authentication.Local.EmailValidation)
		if err != nil {
			return nil, err
		}

		err = json.Unmarshal(phoneNumberValidationBytes, &account.Authentication.Local.PhoneNumberValidation)
		if err != nil {
			return nil, err
		}
		accounts = append(accounts, account)
	}
	return accounts, nil
}

func (PostgresqlStorage) GetAccountsByIds(accountids []string) ([]Account, error) {
	return nil, fmt.Errorf("")
}

func (psql PostgresqlStorage) CreateAccount(account Account) error {
	insertAccountStmt, err := psql.DbConnection.Prepare("INSERT INTO accounts (id, namespace, data, metadata) VALUES ($1, $2, $3, $4)")
	if err != nil {
		return err
	}
	dataAccountJson, err := json.Marshal(account.Data)
	if err != nil {
		return err
	}
	metadataAccountJson, err := json.Marshal(account.Metadata)
	if err != nil {
		return err
	}
	_, err = insertAccountStmt.Exec(account.ID, account.Namespace, dataAccountJson, metadataAccountJson)
	if err != nil {
		return err
	}
	insertAccountAuthStmt, err := psql.DbConnection.Prepare("INSERT INTO account_auth (account_id, username, password, email, email_validation,phone_number,phone_number_validation) values($1, $2, $3, $4, $5, $6, $7)")
	if err != nil {
		return err
	}
	emailValidationJson, err := json.Marshal(account.Authentication.Local.EmailValidation)
	if err != nil {
		return err
	}
	phoneValidationJson, err := json.Marshal(account.Authentication.Local.PhoneNumberValidation)
	if err != nil {
		return err
	}
	_, err = insertAccountAuthStmt.Exec(account.ID, account.Authentication.Local.Username, account.Authentication.Local.Password,
		account.Authentication.Local.Email, emailValidationJson, account.Authentication.Local.PhoneNumber, phoneValidationJson)
	if err != nil {
		return err
	}
	return nil
}

func (psql PostgresqlStorage) UpdateAccount(account Account) error {
	updateAccountStmt, err := psql.DbConnection.Prepare("update accounts set namespace=$1, data=$2,  metadata=$3 where id= $4")
	if err != nil {
		return err
	}
	dataAccountJson, err := json.Marshal(account.Data)
	if err != nil {
		return err
	}
	metadataAccountJson, err := json.Marshal(account.Metadata)
	if err != nil {
		return err
	}
	_, err = updateAccountStmt.Exec(account.Namespace, dataAccountJson, metadataAccountJson, account.ID)
	if err != nil {
		return err
	}
	updateAccountAuthStmt, err := psql.DbConnection.Prepare("update account_auth set username = $1, password = $2, email = $3, email_validation = $4 ,phone_number = $5,phone_number_validation = $6 where account_id = $7")
	if err != nil {
		return err
	}
	emailValidationJson, err := json.Marshal(account.Authentication.Local.EmailValidation)
	if err != nil {
		return err
	}
	phoneValidationJson, err := json.Marshal(account.Authentication.Local.PhoneNumberValidation)
	if err != nil {
		return err
	}
	_, err = updateAccountAuthStmt.Exec(account.Authentication.Local.Username, account.Authentication.Local.Password, account.Authentication.Local.Email,
		emailValidationJson, account.Authentication.Local.PhoneNumber, phoneValidationJson, account.ID)
	if err != nil {
		return err
	}
	return nil
}

func isUUIDv4(str string) bool {
	pattern := regexp.MustCompile(`^[0-9a-fA-F]{8}-[0-9a-fA-F]{4}-4[0-9a-fA-F]{3}-[89aAbB][0-9a-fA-F]{3}-[0-9a-fA-F]{12}$`)
	return pattern.MatchString(str)
}