// Copyright 2014 beego Author. All Rights Reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//      http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

package beego

import (
	"fmt"
	"os"
	"path/filepath"
	"reflect"
	"runtime"
	"strings"

	"github.com/astaxie/beego/config"
	"github.com/astaxie/beego/context"
	"github.com/astaxie/beego/logs"
	"github.com/astaxie/beego/session"
	"github.com/astaxie/beego/utils"
)

// Config is the main struct for BConfig
type Config struct {
	AppName             string //Application name
	RunMode             string //Running Mode: dev | prod
	RouterCaseSensitive bool
	ServerName          string
	RecoverPanic        bool
	RecoverFunc         func(*context.Context)
	CopyRequestBody     bool
	EnableGzip          bool
	MaxMemory           int64
	EnableErrorsShow    bool
	EnableErrorsRender  bool
	Listen              Listen
	WebConfig           WebConfig
	Log                 LogConfig
}

// Listen holds for http and https related config
type Listen struct {
	Graceful          bool // Graceful means use graceful module to start the server
	ServerTimeOut     int64
	ListenTCP4        bool
	EnableHTTP        bool
	HTTPAddr          string
	HTTPPort          int
	EnableHTTPS       bool
	EnableMutualHTTPS bool
	HTTPSAddr         string
	HTTPSPort         int
	HTTPSCertFile     string
	HTTPSKeyFile      string
	TrustCaFile       string
	EnableAdmin       bool
	AdminAddr         string
	AdminPort         int
	EnableFcgi        bool
	EnableStdIo       bool // EnableStdIo works with EnableFcgi Use FCGI via standard I/O
}

// WebConfig holds web related config
type WebConfig struct {
	AutoRender             bool
	EnableDocs             bool
	FlashName              string
	FlashSeparator         string
	DirectoryIndex         bool
	StaticDir              map[string]string
	StaticExtensionsToGzip []string
	TemplateLeft           string
	TemplateRight          string
	ViewsPath              string
	EnableXSRF             bool
	XSRFKey                string
	XSRFExpire             int
	Session                SessionConfig
}

// SessionConfig holds session related config
type SessionConfig struct {
	SessionOn                    bool
	SessionProvider              string
	SessionName                  string
	SessionGCMaxLifetime         int64
	SessionProviderConfig        string
	SessionCookieLifeTime        int
	SessionAutoSetCookie         bool
	SessionDomain                string
	SessionDisableHTTPOnly       bool // used to allow for cross domain cookies/javascript cookies.
	SessionEnableSidInHTTPHeader bool //	enable store/get the sessionId into/from http headers
	SessionNameInHTTPHeader      string
	SessionEnableSidInURLQuery   bool //	enable get the sessionId from Url Query params
}

// LogConfig holds Log related config
type LogConfig struct {
	AccessLogs       bool
	AccessLogsFormat string //access log format: JSON_FORMAT, APACHE_FORMAT or empty string
	FileLineNum      bool
	Outputs          map[string]string // Store Adaptor : config
}

var (
	// BConfig is the default config for Application
	BConfig *Config
	// AppConfig is the instance of Config, store the config information from file
	AppConfig *beegoAppConfig
	// AppPath is the absolute path to the app
	AppPath string
	// GlobalSessions is the instance for the session manager
	GlobalSessions *session.Manager

	// appConfigPath is the path to the config files
	appConfigPath string
	// appConfigProvider is the provider for the config, default is ini
	appConfigProvider = "ini"
)

func init() {
	BConfig = newBConfig()
	var err error
	if AppPath, err = filepath.Abs(filepath.Dir(os.Args[0])); err != nil {
		panic(err)
	}
	workPath, err := os.Getwd()
	if err != nil {
		panic(err)
	}
	var filename = "app.conf"
	if os.Getenv("BEEGO_MODE") != "" {
		filename = os.Getenv("BEEGO_MODE") + ".app.conf"
	}
	appConfigPath = filepath.Join(workPath, "conf", filename)
	if !utils.FileExists(appConfigPath) {
		appConfigPath = filepath.Join(AppPath, "conf", filename)
		if !utils.FileExists(appConfigPath) {
			AppConfig = &beegoAppConfig{innerConfig: config.NewFakeConfig()}
			return
		}
	}
	if err = parseConfig(appConfigPath); err != nil {
		panic(err)
	}
}

func recoverPanic(ctx *context.Context) {
	if err := recover(); err != nil {
		if err == ErrAbort {
			return
		}
		if !BConfig.RecoverPanic {
			panic(err)
		}
		if BConfig.EnableErrorsShow {
			if _, ok := ErrorMaps[fmt.Sprint(err)]; ok {
				exception(fmt.Sprint(err), ctx)
				return
			}
		}
		var stack string
		logs.Critical("the request url is ", ctx.Input.URL())
		logs.Critical("Handler crashed with error", err)
		for i := 1; ; i++ {
			_, file, line, ok := runtime.Caller(i)
			if !ok {
				break
			}
			logs.Critical(fmt.Sprintf("%s:%d", file, line))
			stack = stack + fmt.Sprintln(fmt.Sprintf("%s:%d", file, line))
		}
		if BConfig.RunMode == DEV && BConfig.EnableErrorsRender {
			showErr(err, ctx, stack)
		}
	}
}

func newBConfig() *Config {
	return &Config{
		AppName:             "beego",
		RunMode:             DEV,
		RouterCaseSensitive: true,
		ServerName:          "beegoServer:" + VERSION,
		RecoverPanic:        true,
		RecoverFunc:         recoverPanic,
		CopyRequestBody:     false,
		EnableGzip:          false,
		MaxMemory:           1 << 26, //64MB
		EnableErrorsShow:    true,
		EnableErrorsRender:  true,
		Listen: Listen{
			Graceful:      false,
			ServerTimeOut: 0,
			ListenTCP4:    false,
			EnableHTTP:    true,
			HTTPAddr:      "",
			HTTPPort:      8080,
			EnableHTTPS:   false,
			HTTPSAddr:     "",
			HTTPSPort:     10443,
			HTTPSCertFile: "",
			HTTPSKeyFile:  "",
			EnableAdmin:   false,
			AdminAddr:     "",
			AdminPort:     8088,
			EnableFcgi:    false,
			EnableStdIo:   false,
		},
		WebConfig: WebConfig{
			AutoRender:             true,
			EnableDocs:             false,
			FlashName:              "BEEGO_FLASH",
			FlashSeparator:         "BEEGOFLASH",
			DirectoryIndex:         false,
			StaticDir:              map[string]string{"/static": "static"},
			StaticExtensionsToGzip: []string{".css", ".js"},
			TemplateLeft:           "{{",
			TemplateRight:          "}}",
			ViewsPath:              "views",
			EnableXSRF:             false,
			XSRFKey:                "beegoxsrf",
			XSRFExpire:             0,
			Session: SessionConfig{
				SessionOn:                    false,
				SessionProvider:              "memory",
				SessionName:                  "beegosessionID",
				SessionGCMaxLifetime:         3600,
				SessionProviderConfig:        "",
				SessionDisableHTTPOnly:       false,
				SessionCookieLifeTime:        0, //set cookie default is the browser life
				SessionAutoSetCookie:         true,
				SessionDomain:                "",
				SessionEnableSidInHTTPHeader: false, //	enable store/get the sessionId into/from http headers
				SessionNameInHTTPHeader:      "Beegosessionid",
				SessionEnableSidInURLQuery:   false, //	enable get the sessionId from Url Query params
			},
		},
		Log: LogConfig{
			AccessLogs:       false,
			AccessLogsFormat: "APACHE_FORMAT",
			FileLineNum:      true,
			Outputs:          map[string]string{"console": ""},
		},
	}
}

// now only support ini, next will support json.
func parseConfig(appConfigPath string) (err error) {
	AppConfig, err = newAppConfig(appConfigProvider, appConfigPath)
	if err != nil {
		return err
	}
	return assignConfig(AppConfig)
}

func assignConfig(ac config.Configer) error {
	for _, i := range []interface{}{BConfig, &BConfig.Listen, &BConfig.WebConfig, &BConfig.Log, &BConfig.WebConfig.Session} {
		assignSingleConfig(i, ac)
	}
	// set the run mode first
	if envRunMode := os.Getenv("BEEGO_RUNMODE"); envRunMode != "" {
		BConfig.RunMode = envRunMode
	} else if runMode := ac.String("RunMode"); runMode != "" {
		BConfig.RunMode = runMode
	}

	if sd := ac.String("StaticDir"); sd != "" {
		BConfig.WebConfig.StaticDir = map[string]string{}
		sds := strings.Fields(sd)
		for _, v := range sds {
			if url2fsmap := strings.SplitN(v, ":", 2); len(url2fsmap) == 2 {
				BConfig.WebConfig.StaticDir["/"+strings.Trim(url2fsmap[0], "/")] = url2fsmap[1]
			} else {
				BConfig.WebConfig.StaticDir["/"+strings.Trim(url2fsmap[0], "/")] = url2fsmap[0]
			}
		}
	}

	if sgz := ac.String("StaticExtensionsToGzip"); sgz != "" {
		extensions := strings.Split(sgz, ",")
		fileExts := []string{}
		for _, ext := range extensions {
			ext = strings.TrimSpace(ext)
			if ext == "" {
				continue
			}
			if !strings.HasPrefix(ext, ".") {
				ext = "." + ext
			}
			fileExts = append(fileExts, ext)
		}
		if len(fileExts) > 0 {
			BConfig.WebConfig.StaticExtensionsToGzip = fileExts
		}
	}

	if lo := ac.String("LogOutputs"); lo != "" {
		// if lo is not nil or empty
		// means user has set his own LogOutputs
		// clear the default setting to BConfig.Log.Outputs
		BConfig.Log.Outputs = make(map[string]string)
		los := strings.Split(lo, ";")
		for _, v := range los {
			if logType2Config := strings.SplitN(v, ",", 2); len(logType2Config) == 2 {
				BConfig.Log.Outputs[logType2Config[0]] = logType2Config[1]
			} else {
				continue
			}
		}
	}

	//init log
	logs.Reset()
	for adaptor, config := range BConfig.Log.Outputs {
		err := logs.SetLogger(adaptor, config)
		if err != nil {
			fmt.Fprintln(os.Stderr, fmt.Sprintf("%s with the config %q got err:%s", adaptor, config, err.Error()))
		}
	}
	logs.SetLogFuncCall(BConfig.Log.FileLineNum)

	return nil
}

func assignSingleConfig(p interface{}, ac config.Configer) {
	pt := reflect.TypeOf(p)
	if pt.Kind() != reflect.Ptr {
		return
	}
	pt = pt.Elem()
	if pt.Kind() != reflect.Struct {
		return
	}
	pv := reflect.ValueOf(p).Elem()

	for i := 0; i < pt.NumField(); i++ {
		pf := pv.Field(i)
		if !pf.CanSet() {
			continue
		}
		name := pt.Field(i).Name
		switch pf.Kind() {
		case reflect.String:
			pf.SetString(ac.DefaultString(name, pf.String()))
		case reflect.Int, reflect.Int64:
			pf.SetInt(ac.DefaultInt64(name, pf.Int()))
		case reflect.Bool:
			pf.SetBool(ac.DefaultBool(name, pf.Bool()))
		case reflect.Struct:
		default:
			//do nothing here
		}
	}

}

// LoadAppConfig allow developer to apply a config file
func LoadAppConfig(adapterName, configPath string) error {
	absConfigPath, err := filepath.Abs(configPath)
	if err != nil {
		return err
	}

	if !utils.FileExists(absConfigPath) {
		return fmt.Errorf("the target config file: %s don't exist", configPath)
	}

	appConfigPath = absConfigPath
	appConfigProvider = adapterName

	return parseConfig(appConfigPath)
}

type beegoAppConfig struct {
	innerConfig config.Configer
}

func newAppConfig(appConfigProvider, appConfigPath string) (*beegoAppConfig, error) {
	ac, err := config.NewConfig(appConfigProvider, appConfigPath)
	if err != nil {
		return nil, err
	}
	return &beegoAppConfig{ac}, nil
}

func (b *beegoAppConfig) Set(key, val string) error {
	if err := b.innerConfig.Set(BConfig.RunMode+"::"+key, val); err != nil {
		return err
	}
	return b.innerConfig.Set(key, val)
}

func (b *beegoAppConfig) String(key string) string {
	if v := b.innerConfig.String(BConfig.RunMode + "::" + key); v != "" {
		return v
	}
	return b.innerConfig.String(key)
}

func (b *beegoAppConfig) Strings(key string) []string {
	if v := b.innerConfig.Strings(BConfig.RunMode + "::" + key); len(v) > 0 {
		return v
	}
	return b.innerConfig.Strings(key)
}

func (b *beegoAppConfig) Int(key string) (int, error) {
	if v, err := b.innerConfig.Int(BConfig.RunMode + "::" + key); err == nil {
		return v, nil
	}
	return b.innerConfig.Int(key)
}

func (b *beegoAppConfig) Int64(key string) (int64, error) {
	if v, err := b.innerConfig.Int64(BConfig.RunMode + "::" + key); err == nil {
		return v, nil
	}
	return b.innerConfig.Int64(key)
}

func (b *beegoAppConfig) Bool(key string) (bool, error) {
	if v, err := b.innerConfig.Bool(BConfig.RunMode + "::" + key); err == nil {
		return v, nil
	}
	return b.innerConfig.Bool(key)
}

func (b *beegoAppConfig) Float(key string) (float64, error) {
	if v, err := b.innerConfig.Float(BConfig.RunMode + "::" + key); err == nil {
		return v, nil
	}
	return b.innerConfig.Float(key)
}

func (b *beegoAppConfig) DefaultString(key string, defaultVal string) string {
	if v := b.String(key); v != "" {
		return v
	}
	return defaultVal
}

func (b *beegoAppConfig) DefaultStrings(key string, defaultVal []string) []string {
	if v := b.Strings(key); len(v) != 0 {
		return v
	}
	return defaultVal
}

func (b *beegoAppConfig) DefaultInt(key string, defaultVal int) int {
	if v, err := b.Int(key); err == nil {
		return v
	}
	return defaultVal
}

func (b *beegoAppConfig) DefaultInt64(key string, defaultVal int64) int64 {
	if v, err := b.Int64(key); err == nil {
		return v
	}
	return defaultVal
}

func (b *beegoAppConfig) DefaultBool(key string, defaultVal bool) bool {
	if v, err := b.Bool(key); err == nil {
		return v
	}
	return defaultVal
}

func (b *beegoAppConfig) DefaultFloat(key string, defaultVal float64) float64 {
	if v, err := b.Float(key); err == nil {
		return v
	}
	return defaultVal
}

func (b *beegoAppConfig) DIY(key string) (interface{}, error) {
	return b.innerConfig.DIY(key)
}

func (b *beegoAppConfig) GetSection(section string) (map[string]string, error) {
	return b.innerConfig.GetSection(section)
}

func (b *beegoAppConfig) SaveConfigFile(filename string) error {
	return b.innerConfig.SaveConfigFile(filename)
}
