package main

import (
	"bytes"
	"flag"
	"fmt"
	"io"
	"io/ioutil"
	"os"
	"path"
	"path/filepath"

	"github.com/boltdb/bolt"
	"github.com/gin-gonic/contrib/sessions"
	"github.com/gin-gonic/gin"
)

// AllowedIPs is a white/black list of
// IP addresses allowed to access cowyo
var AllowedIPs = map[string]bool{
	"192.168.1.13": true,
	"192.168.1.12": true,
	"192.168.1.2":  true,
}

// RuntimeArgs contains all runtime
// arguments available
var RuntimeArgs struct {
	WikiName         string
	ExternalIP       string
	Port             string
	DatabaseLocation string
	ServerCRT        string
	ServerKey        string
	SourcePath       string
	AdminKey         string
	Socket           string
	ForceWss         bool
	DumpDataset      string
	RestoreDataset   string
}
var VersionNum string

func init() {
	gin.SetMode(gin.ReleaseMode)
}

func main() {
	VersionNum = "1.1"
	// _, executableFile, _, _ := runtime.Caller(0) // get full path of this file
	cwd, _ := os.Getwd()
	databaseFile := path.Join(cwd, "data.db")
	flag.StringVar(&RuntimeArgs.Port, "p", ":8003", "port to bind")
	flag.StringVar(&RuntimeArgs.DatabaseLocation, "db", databaseFile, "location of database file")
	flag.StringVar(&RuntimeArgs.AdminKey, "a", "", "key to access admin privaleges")
	flag.StringVar(&RuntimeArgs.ServerCRT, "crt", "", "location of SSL certificate")
	flag.StringVar(&RuntimeArgs.ServerKey, "key", "", "location of SSL key")
	flag.StringVar(&RuntimeArgs.WikiName, "w", "cowyo", "custom name for wiki")
	flag.BoolVar(&RuntimeArgs.ForceWss, "e", false, "force encrypted sockets (use if using Caddy auto HTTPS)")
	flag.StringVar(&RuntimeArgs.DumpDataset, "dump", "", "directory to dump all data to")
	flag.StringVar(&RuntimeArgs.RestoreDataset, "restore", "", "directory to restore all data from")
	flag.CommandLine.Usage = func() {
		fmt.Println(`cowyo (version ` + VersionNum + `)

Usage: cowyo [options] [address]

If address is not provided then cowyo
will determine the best internal IP address.

Example: 'cowyo'
Example: 'cowyo yourserver.com'
Example: 'cowyo -p :8080 localhost:8080'
Example: 'cowyo -p :8080 -crt ssl/server.crt -key ssl/server.key localhost:8080'

Options:`)
		flag.CommandLine.PrintDefaults()
	}
	flag.Parse()

	if len(RuntimeArgs.DumpDataset) > 0 {
		fmt.Println("Dumping data to '" + RuntimeArgs.DumpDataset + "' folder...")
		dumpEverything(RuntimeArgs.DumpDataset)
		os.Exit(1)
	}

	RuntimeArgs.ExternalIP = flag.Arg(0)
	if RuntimeArgs.ExternalIP == "" {
		RuntimeArgs.ExternalIP = GetLocalIP() + RuntimeArgs.Port
	}
	RuntimeArgs.SourcePath = cwd

	if len(RuntimeArgs.AdminKey) == 0 {
		RuntimeArgs.AdminKey = RandStringBytesMaskImprSrc(50)
	}
	// create programdata bucket
	Open(RuntimeArgs.DatabaseLocation)

	err := db.Update(func(tx *bolt.Tx) error {
		_, err := tx.CreateBucketIfNotExists([]byte("programdata"))
		if err != nil {
			return fmt.Errorf("create bucket: %s", err)
		}
		return err
	})
	if err != nil {
		panic(err)
	}
	Close()

	// Default page
	defaultPage, _ := ioutil.ReadFile(path.Join(RuntimeArgs.SourcePath, "templates/aboutpage.md"))
	p := WikiData{"help", "", []string{}, []string{}, false, "zzz"}
	p.save(string(defaultPage))
	defaultPage, _ = ioutil.ReadFile(path.Join(RuntimeArgs.SourcePath, "templates/privacypolicy.md"))
	p = WikiData{"privacypolicy", "", []string{}, []string{}, false, "zzz"}
	p.save(string(defaultPage))

	if len(RuntimeArgs.RestoreDataset) > 0 {
		fmt.Println("Restoring data from '" + RuntimeArgs.RestoreDataset + "' folder...")
		filepath.Walk(RuntimeArgs.RestoreDataset, restoreFile)
		os.Exit(1)
	}
	// var q WikiData
	// q.load("about")
	// fmt.Println(getImportantVersions(q))

	r := gin.Default()
	r.LoadHTMLGlob(path.Join(RuntimeArgs.SourcePath, "templates/*"))
	store := sessions.NewCookieStore([]byte("secret"))
	r.Use(sessions.Sessions("mysession", store))
	r.GET("/", newNote)
	r.HEAD("/", func(c *gin.Context) { c.Status(200) })
	r.GET("/:title", editNote)
	r.PUT("/:title", putFile)
	r.PUT("/", putFile)
	r.GET("/:title/*option", everythingElse)
	r.POST("/:title/*option", encryptionRoute)
	r.DELETE("/listitem", deleteListItem)
	r.DELETE("/deletepage", deletePage)
	if RuntimeArgs.ServerCRT != "" && RuntimeArgs.ServerKey != "" {
		RuntimeArgs.Socket = "wss"
		fmt.Println("--------------------------")
		fmt.Println("cowyo (version " + VersionNum + ") is up and running on https://" + RuntimeArgs.ExternalIP)
		fmt.Println("Admin key: " + RuntimeArgs.AdminKey)
		fmt.Println("--------------------------")
		r.RunTLS(RuntimeArgs.Port, RuntimeArgs.ServerCRT, RuntimeArgs.ServerKey)
	} else {
		RuntimeArgs.Socket = "ws"
		if RuntimeArgs.ForceWss {
			RuntimeArgs.Socket = "wss"
		}
		fmt.Println("--------------------------")
		fmt.Println("cowyo (version " + VersionNum + ") is up and running on http://" + RuntimeArgs.ExternalIP)
		fmt.Println("Admin key: " + RuntimeArgs.AdminKey)
		fmt.Println("--------------------------")
		r.Run(RuntimeArgs.Port)
	}
}

func restoreFile(path string, f os.FileInfo, err error) error {
	fName := filepath.Base(path)
	buf := bytes.NewBuffer(nil)
	fOpen, _ := os.Open(path) // Error handling elided for brevity.
	io.Copy(buf, fOpen)       // Error handling elided for brevity.
	fOpen.Close()
	s := string(buf.Bytes())
	fmt.Println(fName)
	p := WikiData{fName, "", []string{}, []string{}, false, ""}
	p.save(s)
	return nil
}