// Copyright 2014 The Gogs Authors. All rights reserved.
// Use of this source code is governed by a MIT-style
// license that can be found in the LICENSE file.

package setting

import (
	"fmt"
	"net/url"
	"os"
	"os/exec"
	"path"
	"path/filepath"
	"runtime"
	"strings"
	"time"

	"gopkg.in/ini.v1"

	"github.com/Unknwon/com"
	"github.com/macaron-contrib/oauth2"
	"github.com/macaron-contrib/session"

	"github.com/gogits/gogs/modules/bindata"
	"github.com/gogits/gogs/modules/log"
	// "github.com/gogits/gogs/modules/ssh"
	"github.com/gogits/gogs/modules/user"
)

type Scheme string

const (
	HTTP  Scheme = "http"
	HTTPS Scheme = "https"
	FCGI  Scheme = "fcgi"
)

type LandingPage string

const (
	LANDING_PAGE_HOME    LandingPage = "/"
	LANDING_PAGE_EXPLORE LandingPage = "/explore"
)

var (
	// App settings.
	AppVer    string
	AppName   string
	AppUrl    string
	AppSubUrl string

	// Server settings.
	Protocol           Scheme
	Domain             string
	HttpAddr, HttpPort string
	DisableSSH         bool
	SSHPort            int
	SSHDomain          string
	OfflineMode        bool
	DisableRouterLog   bool
	CertFile, KeyFile  string
	StaticRootPath     string
	EnableGzip         bool
	LandingPageUrl     LandingPage

	// Security settings.
	InstallLock          bool
	SecretKey            string
	LogInRememberDays    int
	CookieUserName       string
	CookieRememberName   string
	ReverseProxyAuthUser string

	// Database settings.
	UseSQLite3    bool
	UseMySQL      bool
	UsePostgreSQL bool

	// Webhook settings.
	Webhook struct {
		QueueLength    int
		DeliverTimeout int
		SkipTLSVerify  bool
	}

	// Repository settings.
	RepoRootPath string
	ScriptType   string
	AnsiCharset  string

	// UI settings.
	IssuePagingNum int

	// Picture settings.
	PictureService   string
	AvatarUploadPath string
	GravatarSource   string
	DisableGravatar  bool

	// Log settings.
	LogRootPath string
	LogModes    []string
	LogConfigs  []string

	// Attachment settings.
	AttachmentPath         string
	AttachmentAllowedTypes string
	AttachmentMaxSize      int64
	AttachmentMaxFiles     int
	AttachmentEnabled      bool

	// Time settings.
	TimeFormat string

	// Cache settings.
	CacheAdapter  string
	CacheInternal int
	CacheConn     string

	EnableRedis    bool
	EnableMemcache bool

	// Session settings.
	SessionConfig session.Options

	// Git settings.
	Git struct {
		MaxGitDiffLines int
		GcArgs          []string `delim:" "`
		Fsck            struct {
			Enable   bool
			Interval int
			Args     []string `delim:" "`
		} `ini:"git.fsck"`
	}

	// I18n settings.
	Langs, Names []string
	dateLangs    map[string]string

	// Other settings.
	ShowFooterBranding bool

	// Global setting objects.
	Cfg          *ini.File
	CustomPath   string // Custom directory path.
	CustomConf   string
	ProdMode     bool
	RunUser      string
	IsWindows    bool
	HasRobotsTxt bool
)

func DateLang(lang string) string {
	name, ok := dateLangs[lang]
	if ok {
		return name
	}
	return "en"
}

func init() {
	IsWindows = runtime.GOOS == "windows"
	log.NewLogger(0, "console", `{"level": 0}`)
}

func ExecPath() (string, error) {
	file, err := exec.LookPath(os.Args[0])
	if err != nil {
		return "", err
	}
	p, err := filepath.Abs(file)
	if err != nil {
		return "", err
	}
	return p, nil
}

// WorkDir returns absolute path of work directory.
func WorkDir() (string, error) {
	execPath, err := ExecPath()
	if err != nil {
		return execPath, err
	}

	// Note: we don't use path.Dir here because it does not handle case
	//	which path starts with two "/" in Windows: "//psf/Home/..."
	execPath = strings.Replace(execPath, "\\", "/", -1)
	i := strings.LastIndex(execPath, "/")
	if i == -1 {
		return execPath, nil
	}
	return execPath[:i], nil
}

func forcePathSeparator(path string) {
	if strings.Contains(path, "\\") {
		log.Fatal(4, "Do not use '\\' or '\\\\' in paths, instead, please use '/' in all places")
	}
}

// NewConfigContext initializes configuration context.
// NOTE: do not print any log except error.
func NewConfigContext() {
	workDir, err := WorkDir()
	if err != nil {
		log.Fatal(4, "Fail to get work directory: %v", err)
	}

	Cfg, err = ini.Load(bindata.MustAsset("conf/app.ini"))
	if err != nil {
		log.Fatal(4, "Fail to parse 'conf/app.ini': %v", err)
	}

	CustomPath = os.Getenv("GOGS_CUSTOM")
	if len(CustomPath) == 0 {
		CustomPath = workDir + "/custom"
	}

	if len(CustomConf) == 0 {
		CustomConf = CustomPath + "/conf/app.ini"
	}

	if com.IsFile(CustomConf) {
		if err = Cfg.Append(CustomConf); err != nil {
			log.Fatal(4, "Fail to load custom conf '%s': %v", CustomConf, err)
		}
	} else {
		log.Warn("Custom config (%s) not found, ignore this if you're running first time", CustomConf)
	}
	Cfg.NameMapper = ini.AllCapsUnderscore

	LogRootPath = Cfg.Section("log").Key("ROOT_PATH").MustString(path.Join(workDir, "log"))
	forcePathSeparator(LogRootPath)

	sec := Cfg.Section("server")
	AppName = Cfg.Section("").Key("APP_NAME").MustString("Gogs: Go Git Service")
	AppUrl = sec.Key("ROOT_URL").MustString("http://localhost:3000/")
	if AppUrl[len(AppUrl)-1] != '/' {
		AppUrl += "/"
	}

	// Check if has app suburl.
	url, err := url.Parse(AppUrl)
	if err != nil {
		log.Fatal(4, "Invalid ROOT_URL(%s): %s", AppUrl, err)
	}
	AppSubUrl = strings.TrimSuffix(url.Path, "/")

	Protocol = HTTP
	if sec.Key("PROTOCOL").String() == "https" {
		Protocol = HTTPS
		CertFile = sec.Key("CERT_FILE").String()
		KeyFile = sec.Key("KEY_FILE").String()
	} else if sec.Key("PROTOCOL").String() == "fcgi" {
		Protocol = FCGI
	}
	Domain = sec.Key("DOMAIN").MustString("localhost")
	HttpAddr = sec.Key("HTTP_ADDR").MustString("0.0.0.0")
	HttpPort = sec.Key("HTTP_PORT").MustString("3000")
	DisableSSH = sec.Key("DISABLE_SSH").MustBool()
	SSHDomain = sec.Key("SSH_DOMAIN").MustString(Domain)
	SSHPort = sec.Key("SSH_PORT").MustInt(22)
	OfflineMode = sec.Key("OFFLINE_MODE").MustBool()
	DisableRouterLog = sec.Key("DISABLE_ROUTER_LOG").MustBool()
	StaticRootPath = sec.Key("STATIC_ROOT_PATH").MustString(workDir)
	EnableGzip = sec.Key("ENABLE_GZIP").MustBool()

	switch sec.Key("LANDING_PAGE").MustString("home") {
	case "explore":
		LandingPageUrl = LANDING_PAGE_EXPLORE
	default:
		LandingPageUrl = LANDING_PAGE_HOME
	}

	sec = Cfg.Section("security")
	InstallLock = sec.Key("INSTALL_LOCK").MustBool()
	SecretKey = sec.Key("SECRET_KEY").String()
	LogInRememberDays = sec.Key("LOGIN_REMEMBER_DAYS").MustInt()
	CookieUserName = sec.Key("COOKIE_USERNAME").String()
	CookieRememberName = sec.Key("COOKIE_REMEMBER_NAME").String()
	ReverseProxyAuthUser = sec.Key("REVERSE_PROXY_AUTHENTICATION_USER").MustString("X-WEBAUTH-USER")

	sec = Cfg.Section("attachment")
	AttachmentPath = sec.Key("PATH").MustString("data/attachments")
	if !filepath.IsAbs(AttachmentPath) {
		AttachmentPath = path.Join(workDir, AttachmentPath)
	}
	AttachmentAllowedTypes = strings.Replace(sec.Key("ALLOWED_TYPES").MustString("image/jpeg,image/png"), "|", ",", -1)
	AttachmentMaxSize = sec.Key("MAX_SIZE").MustInt64(32)
	AttachmentMaxFiles = sec.Key("MAX_FILES").MustInt(5)
	AttachmentEnabled = sec.Key("ENABLE").MustBool(true)

	TimeFormat = map[string]string{
		"ANSIC":       time.ANSIC,
		"UnixDate":    time.UnixDate,
		"RubyDate":    time.RubyDate,
		"RFC822":      time.RFC822,
		"RFC822Z":     time.RFC822Z,
		"RFC850":      time.RFC850,
		"RFC1123":     time.RFC1123,
		"RFC1123Z":    time.RFC1123Z,
		"RFC3339":     time.RFC3339,
		"RFC3339Nano": time.RFC3339Nano,
		"Kitchen":     time.Kitchen,
		"Stamp":       time.Stamp,
		"StampMilli":  time.StampMilli,
		"StampMicro":  time.StampMicro,
		"StampNano":   time.StampNano,
	}[Cfg.Section("time").Key("FORMAT").MustString("RFC1123")]

	RunUser = Cfg.Section("").Key("RUN_USER").String()
	curUser := user.CurrentUsername()
	// Does not check run user when the install lock is off.
	if InstallLock && RunUser != curUser {
		log.Fatal(4, "Expect user(%s) but current user is: %s", RunUser, curUser)
	}

	// Determine and create root git repository path.
	homeDir, err := com.HomeDir()
	if err != nil {
		log.Fatal(4, "Fail to get home directory: %v", err)
	}
	homeDir = strings.Replace(homeDir, "\\", "/", -1)

	sec = Cfg.Section("repository")
	RepoRootPath = sec.Key("ROOT").MustString(path.Join(homeDir, "gogs-repositories"))
	forcePathSeparator(RepoRootPath)
	if !filepath.IsAbs(RepoRootPath) {
		RepoRootPath = path.Join(workDir, RepoRootPath)
	} else {
		RepoRootPath = path.Clean(RepoRootPath)
	}
	ScriptType = sec.Key("SCRIPT_TYPE").MustString("bash")
	AnsiCharset = sec.Key("ANSI_CHARSET").MustString("")

	// UI settings.
	IssuePagingNum = Cfg.Section("ui").Key("ISSUE_PAGING_NUM").MustInt(10)

	sec = Cfg.Section("picture")
	PictureService = sec.Key("SERVICE").In("server", []string{"server"})
	AvatarUploadPath = sec.Key("AVATAR_UPLOAD_PATH").MustString("data/avatars")
	forcePathSeparator(AvatarUploadPath)
	if !filepath.IsAbs(AvatarUploadPath) {
		AvatarUploadPath = path.Join(workDir, AvatarUploadPath)
	}
	switch source := sec.Key("GRAVATAR_SOURCE").MustString("gravatar"); source {
	case "duoshuo":
		GravatarSource = "http://gravatar.duoshuo.com/avatar/"
	case "gravatar":
		GravatarSource = "//1.gravatar.com/avatar/"
	default:
		GravatarSource = source
	}
	DisableGravatar = sec.Key("DISABLE_GRAVATAR").MustBool()
	if OfflineMode {
		DisableGravatar = true
	}

	if err = Cfg.Section("git").MapTo(&Git); err != nil {
		log.Fatal(4, "Fail to map Git settings: %v", err)
	}

	Langs = Cfg.Section("i18n").Key("LANGS").Strings(",")
	Names = Cfg.Section("i18n").Key("NAMES").Strings(",")
	dateLangs = Cfg.Section("i18n.datelang").KeysHash()

	ShowFooterBranding = Cfg.Section("other").Key("SHOW_FOOTER_BRANDING").MustBool()

	HasRobotsTxt = com.IsFile(path.Join(CustomPath, "robots.txt"))
}

var Service struct {
	ActiveCodeLives                int
	ResetPwdCodeLives              int
	RegisterEmailConfirm           bool
	DisableRegistration            bool
	ShowRegistrationButton         bool
	RequireSignInView              bool
	EnableCacheAvatar              bool
	EnableNotifyMail               bool
	EnableReverseProxyAuth         bool
	EnableReverseProxyAutoRegister bool
	DisableMinimumKeySizeCheck     bool
}

func newService() {
	sec := Cfg.Section("service")
	Service.ActiveCodeLives = sec.Key("ACTIVE_CODE_LIVE_MINUTES").MustInt(180)
	Service.ResetPwdCodeLives = sec.Key("RESET_PASSWD_CODE_LIVE_MINUTES").MustInt(180)
	Service.DisableRegistration = sec.Key("DISABLE_REGISTRATION").MustBool()
	Service.ShowRegistrationButton = sec.Key("SHOW_REGISTRATION_BUTTON").MustBool(!Service.DisableRegistration)
	Service.RequireSignInView = sec.Key("REQUIRE_SIGNIN_VIEW").MustBool()
	Service.EnableCacheAvatar = sec.Key("ENABLE_CACHE_AVATAR").MustBool()
	Service.EnableReverseProxyAuth = sec.Key("ENABLE_REVERSE_PROXY_AUTHENTICATION").MustBool()
	Service.EnableReverseProxyAutoRegister = sec.Key("ENABLE_REVERSE_PROXY_AUTO_REGISTRATION").MustBool()
	Service.DisableMinimumKeySizeCheck = sec.Key("DISABLE_MINIMUM_KEY_SIZE_CHECK").MustBool()
}

var logLevels = map[string]string{
	"Trace":    "0",
	"Debug":    "1",
	"Info":     "2",
	"Warn":     "3",
	"Error":    "4",
	"Critical": "5",
}

func newLogService() {
	log.Info("%s %s", AppName, AppVer)

	// Get and check log mode.
	LogModes = strings.Split(Cfg.Section("log").Key("MODE").MustString("console"), ",")
	LogConfigs = make([]string, len(LogModes))
	for i, mode := range LogModes {
		mode = strings.TrimSpace(mode)
		sec, err := Cfg.GetSection("log." + mode)
		if err != nil {
			log.Fatal(4, "Unknown log mode: %s", mode)
		}

		validLevels := []string{"Trace", "Debug", "Info", "Warn", "Error", "Critical"}
		// Log level.
		levelName := Cfg.Section("log."+mode).Key("LEVEL").In(
			Cfg.Section("log").Key("LEVEL").In("Trace", validLevels),
			validLevels)
		level, ok := logLevels[levelName]
		if !ok {
			log.Fatal(4, "Unknown log level: %s", levelName)
		}

		// Generate log configuration.
		switch mode {
		case "console":
			LogConfigs[i] = fmt.Sprintf(`{"level":%s}`, level)
		case "file":
			logPath := sec.Key("FILE_NAME").MustString(path.Join(LogRootPath, "gogs.log"))
			os.MkdirAll(path.Dir(logPath), os.ModePerm)
			LogConfigs[i] = fmt.Sprintf(
				`{"level":%s,"filename":"%s","rotate":%v,"maxlines":%d,"maxsize":%d,"daily":%v,"maxdays":%d}`, level,
				logPath,
				sec.Key("LOG_ROTATE").MustBool(true),
				sec.Key("MAX_LINES").MustInt(1000000),
				1<<uint(sec.Key("MAX_SIZE_SHIFT").MustInt(28)),
				sec.Key("DAILY_ROTATE").MustBool(true),
				sec.Key("MAX_DAYS").MustInt(7))
		case "conn":
			LogConfigs[i] = fmt.Sprintf(`{"level":%s,"reconnectOnMsg":%v,"reconnect":%v,"net":"%s","addr":"%s"}`, level,
				sec.Key("RECONNECT_ON_MSG").MustBool(),
				sec.Key("RECONNECT").MustBool(),
				sec.Key("PROTOCOL").In("tcp", []string{"tcp", "unix", "udp"}),
				sec.Key("ADDR").MustString(":7020"))
		case "smtp":
			LogConfigs[i] = fmt.Sprintf(`{"level":%s,"username":"%s","password":"%s","host":"%s","sendTos":"%s","subject":"%s"}`, level,
				sec.Key("USER").MustString("example@example.com"),
				sec.Key("PASSWD").MustString("******"),
				sec.Key("HOST").MustString("127.0.0.1:25"),
				sec.Key("RECEIVERS").MustString("[]"),
				sec.Key("SUBJECT").MustString("Diagnostic message from serve"))
		case "database":
			LogConfigs[i] = fmt.Sprintf(`{"level":%s,"driver":"%s","conn":"%s"}`, level,
				sec.Key("DRIVER").String(),
				sec.Key("CONN").String())
		}

		log.NewLogger(Cfg.Section("log").Key("BUFFER_LEN").MustInt64(10000), mode, LogConfigs[i])
		log.Info("Log Mode: %s(%s)", strings.Title(mode), levelName)
	}
}

func newCacheService() {
	CacheAdapter = Cfg.Section("cache").Key("ADAPTER").In("memory", []string{"memory", "redis", "memcache"})
	if EnableRedis {
		log.Info("Redis Supported")
	}
	if EnableMemcache {
		log.Info("Memcache Supported")
	}

	switch CacheAdapter {
	case "memory":
		CacheInternal = Cfg.Section("cache").Key("INTERVAL").MustInt(60)
	case "redis", "memcache":
		CacheConn = strings.Trim(Cfg.Section("cache").Key("HOST").String(), "\" ")
	default:
		log.Fatal(4, "Unknown cache adapter: %s", CacheAdapter)
	}

	log.Info("Cache Service Enabled")
}

func newSessionService() {
	SessionConfig.Provider = Cfg.Section("session").Key("PROVIDER").In("memory",
		[]string{"memory", "file", "redis", "mysql"})
	SessionConfig.ProviderConfig = strings.Trim(Cfg.Section("session").Key("PROVIDER_CONFIG").String(), "\" ")
	SessionConfig.CookieName = Cfg.Section("session").Key("COOKIE_NAME").MustString("i_like_gogits")
	SessionConfig.CookiePath = AppSubUrl
	SessionConfig.Secure = Cfg.Section("session").Key("COOKIE_SECURE").MustBool()
	SessionConfig.Gclifetime = Cfg.Section("session").Key("GC_INTERVAL_TIME").MustInt64(86400)
	SessionConfig.Maxlifetime = Cfg.Section("session").Key("SESSION_LIFE_TIME").MustInt64(86400)

	log.Info("Session Service Enabled")
}

// Mailer represents mail service.
type Mailer struct {
	Name              string
	Host              string
	From              string
	User, Passwd      string
	DisableHelo       bool
	HeloHostname      string
	SkipVerify        bool
	UseCertificate    bool
	CertFile, KeyFile string
}

type OauthInfo struct {
	oauth2.Options
	AuthUrl, TokenUrl string
}

// Oauther represents oauth service.
type Oauther struct {
	GitHub, Google, Tencent,
	Twitter, Weibo bool
	OauthInfos map[string]*OauthInfo
}

var (
	MailService  *Mailer
	OauthService *Oauther
)

func newMailService() {
	sec := Cfg.Section("mailer")
	// Check mailer setting.
	if !sec.Key("ENABLED").MustBool() {
		return
	}

	MailService = &Mailer{
		Name:           sec.Key("NAME").MustString(AppName),
		Host:           sec.Key("HOST").String(),
		User:           sec.Key("USER").String(),
		Passwd:         sec.Key("PASSWD").String(),
		DisableHelo:    sec.Key("DISABLE_HELO").MustBool(),
		HeloHostname:   sec.Key("HELO_HOSTNAME").String(),
		SkipVerify:     sec.Key("SKIP_VERIFY").MustBool(),
		UseCertificate: sec.Key("USE_CERTIFICATE").MustBool(),
		CertFile:       sec.Key("CERT_FILE").String(),
		KeyFile:        sec.Key("KEY_FILE").String(),
	}
	MailService.From = sec.Key("FROM").MustString(MailService.User)
	log.Info("Mail Service Enabled")
}

func newRegisterMailService() {
	if !Cfg.Section("service").Key("REGISTER_EMAIL_CONFIRM").MustBool() {
		return
	} else if MailService == nil {
		log.Warn("Register Mail Service: Mail Service is not enabled")
		return
	}
	Service.RegisterEmailConfirm = true
	log.Info("Register Mail Service Enabled")
}

func newNotifyMailService() {
	if !Cfg.Section("service").Key("ENABLE_NOTIFY_MAIL").MustBool() {
		return
	} else if MailService == nil {
		log.Warn("Notify Mail Service: Mail Service is not enabled")
		return
	}
	Service.EnableNotifyMail = true
	log.Info("Notify Mail Service Enabled")
}

func newWebhookService() {
	sec := Cfg.Section("webhook")
	Webhook.QueueLength = sec.Key("QUEUE_LENGTH").MustInt(1000)
	Webhook.DeliverTimeout = sec.Key("DELIVER_TIMEOUT").MustInt(5)
	Webhook.SkipTLSVerify = sec.Key("SKIP_TLS_VERIFY").MustBool()
}

func NewServices() {
	newService()
	newLogService()
	newCacheService()
	newSessionService()
	newMailService()
	newRegisterMailService()
	newNotifyMailService()
	newWebhookService()
	// ssh.Listen("2222")
}