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// Copyright (c) 2015 Spinpunch, Inc. All Rights Reserved.
// See License.txt for license information.

package utils

import (
	l4g "code.google.com/p/log4go"
	"encoding/json"
	"net/mail"
	"os"
	"path/filepath"
)

const (
	MODE_DEV  = "dev"
	MODE_BETA = "beta"
	MODE_PROD = "prod"
)

type ServiceSettings struct {
	SiteName       string
	Domain         string
	Mode           string
	AllowTesting   bool
	UseSSL         bool
	Port           string
	Version        string
	Shards         map[string]string
	InviteSalt     string
	PublicLinkSalt string
	ResetSalt      string
	AnalyticsUrl   string
}

type SqlSettings struct {
	DriverName         string
	DataSource         string
	DataSourceReplicas []string
	MaxIdleConns       int
	MaxOpenConns       int
	Trace              bool
	AtRestEncryptKey   string
}

type RedisSettings struct {
	DataSource   string
	MaxOpenConns int
}

type LogSettings struct {
	ConsoleEnable bool
	ConsoleLevel  string
	FileEnable    bool
	FileLevel     string
	FileFormat    string
	FileLocation  string
}

type AWSSettings struct {
	S3AccessKeyId          string
	S3SecretAccessKey      string
	S3Bucket               string
	S3Region               string
	Route53AccessKeyId     string
	Route53SecretAccessKey string
	Route53ZoneId          string
	Route53Region          string
}

type ImageSettings struct {
	ThumbnailWidth  uint
	ThumbnailHeight uint
	PreviewWidth    uint
	PreviewHeight   uint
	ProfileWidth    uint
	ProfileHeight   uint
}

type EmailSettings struct {
	SMTPUsername         string
	SMTPPassword         string
	SMTPServer           string
	UseTLS               bool
	FeedbackEmail        string
	FeedbackName         string
	ApplePushServer      string
	ApplePushCertPublic  string
	ApplePushCertPrivate string
}

type PrivacySettings struct {
	ShowEmailAddress bool
	ShowPhoneNumber  bool
	ShowSkypeId      bool
	ShowFullName     bool
}

type TeamSettings struct {
	MaxUsersPerTeam   int
	AllowPublicLink   bool
	AllowValet        bool
	TermsLink         string
	PrivacyLink       string
	AboutLink         string
	HelpLink          string
	ReportProblemLink string
	TourLink          string
	DefaultThemeColor string
}

type Config struct {
	LogSettings     LogSettings
	ServiceSettings ServiceSettings
	SqlSettings     SqlSettings
	RedisSettings   RedisSettings
	AWSSettings     AWSSettings
	ImageSettings   ImageSettings
	EmailSettings   EmailSettings
	PrivacySettings PrivacySettings
	TeamSettings    TeamSettings
}

func (o *Config) ToJson() string {
	b, err := json.Marshal(o)
	if err != nil {
		return ""
	} else {
		return string(b)
	}
}

var Cfg *Config = &Config{}
var SanitizeOptions map[string]bool = map[string]bool{}

func findConfigFile(fileName string) string {
	if _, err := os.Stat("/tmp/" + fileName); err == nil {
		fileName, _ = filepath.Abs("/tmp/" + fileName)
	} else if _, err := os.Stat("./config/" + fileName); err == nil {
		fileName, _ = filepath.Abs("./config/" + fileName)
	} else if _, err := os.Stat("../config/" + fileName); err == nil {
		fileName, _ = filepath.Abs("../config/" + fileName)
	} else if _, err := os.Stat(fileName); err == nil {
		fileName, _ = filepath.Abs(fileName)
	}

	return fileName
}

func FindDir(dir string) string {
	fileName := "."
	if _, err := os.Stat("./" + dir + "/"); err == nil {
		fileName, _ = filepath.Abs("./" + dir + "/")
	} else if _, err := os.Stat("../" + dir + "/"); err == nil {
		fileName, _ = filepath.Abs("../" + dir + "/")
	} else if _, err := os.Stat("/tmp/" + dir); err == nil {
		fileName, _ = filepath.Abs("/tmp/" + dir)
	}

	return fileName + "/"
}

func configureLog(s LogSettings) {

	l4g.Close()

	if s.ConsoleEnable {
		level := l4g.DEBUG
		if s.ConsoleLevel == "INFO" {
			level = l4g.INFO
		} else if s.ConsoleLevel == "ERROR" {
			level = l4g.ERROR
		}

		l4g.AddFilter("stdout", level, l4g.NewConsoleLogWriter())
	}

	if s.FileEnable {
		if s.FileFormat == "" {
			s.FileFormat = "[%D %T] [%L] %M"
		}

		if s.FileLocation == "" {
			s.FileLocation = FindDir("logs") + "mattermost.log"
		}

		level := l4g.DEBUG
		if s.FileLevel == "INFO" {
			level = l4g.INFO
		} else if s.FileLevel == "ERROR" {
			level = l4g.ERROR
		}

		flw := l4g.NewFileLogWriter(s.FileLocation, false)
		flw.SetFormat(s.FileFormat)
		flw.SetRotate(true)
		flw.SetRotateLines(100000)
		l4g.AddFilter("file", level, flw)
	}
}

// LoadConfig will try to search around for the corresponding config file.
// It will search /tmp/fileName then attempt ./config/fileName,
// then ../config/fileName and last it will look at fileName
func LoadConfig(fileName string) {

	fileName = findConfigFile(fileName)
	l4g.Info("Loading config file at " + fileName)

	file, err := os.Open(fileName)
	if err != nil {
		panic("Error opening config file=" + fileName + ", err=" + err.Error())
	}

	decoder := json.NewDecoder(file)
	config := Config{}
	err = decoder.Decode(&config)
	if err != nil {
		panic("Error decoding configuration " + err.Error())
	}

	// Grabs the domain from enviroment variable if not in configuration
	if config.ServiceSettings.Domain == "" {
		config.ServiceSettings.Domain = os.Getenv("MATTERMOST_DOMAIN")
	}

	// Check for a valid email for feedback, if not then do feedback@domain
	if _, err := mail.ParseAddress(config.EmailSettings.FeedbackEmail); err != nil {
		config.EmailSettings.FeedbackEmail = "feedback@" + config.ServiceSettings.Domain
	}

	configureLog(config.LogSettings)

	Cfg = &config
	SanitizeOptions = getSanitizeOptions()

	// Validates our mail settings
	if err := CheckMailSettings(); err != nil {
		l4g.Error("Email settings are not valid err=%v", err)
	}
}

func getSanitizeOptions() map[string]bool {
	options := map[string]bool{}
	options["fullname"] = Cfg.PrivacySettings.ShowFullName
	options["email"] = Cfg.PrivacySettings.ShowEmailAddress
	options["skypeid"] = Cfg.PrivacySettings.ShowSkypeId
	options["phonenumber"] = Cfg.PrivacySettings.ShowPhoneNumber

	return options
}

func IsS3Configured() bool {
	if Cfg.AWSSettings.S3AccessKeyId == "" || Cfg.AWSSettings.S3SecretAccessKey == "" || Cfg.AWSSettings.S3Region == "" || Cfg.AWSSettings.S3Bucket == "" {
		return false
	}

	return true
}