// Copyright 2017 Frédéric Guillot. All rights reserved.
// Use of this source code is governed by the Apache 2.0
// license that can be found in the LICENSE file.

package model

import (
	"database/sql/driver"
	"encoding/json"
	"errors"
	"fmt"
)

// SessionData represents the data attached to the session.
type SessionData struct {
	CSRF              string `json:"csrf"`
	OAuth2State       string `json:"oauth2_state"`
	FlashMessage      string `json:"flash_message"`
	FlashErrorMessage string `json:"flash_error_message"`
}

func (s SessionData) String() string {
	return fmt.Sprintf(`CSRF="%s", "OAuth2State="%s", FlashMessage="%s", "FlashErrorMessage="%s"`,
		s.CSRF, s.OAuth2State, s.FlashMessage, s.FlashErrorMessage)
}

// Value converts the session data to JSON.
func (s SessionData) Value() (driver.Value, error) {
	j, err := json.Marshal(s)
	return j, err
}

// Scan converts raw JSON data.
func (s *SessionData) Scan(src interface{}) error {
	source, ok := src.([]byte)
	if !ok {
		return errors.New("session: unable to assert type of src")
	}

	err := json.Unmarshal(source, s)
	if err != nil {
		return fmt.Errorf("session: %v", err)
	}

	return err
}

// Session represents a session in the system.
type Session struct {
	ID   string
	Data *SessionData
}

func (s *Session) String() string {
	return fmt.Sprintf(`ID="%s", Data="%v"`, s.ID, s.Data)
}