package controllers

import (
	"fmt"
	"html/template"
	"io/ioutil"
	"log"
	"net/http"
	"os"
	"path/filepath"
	"strings"

	"github.com/gophish/gophish/auth"
	"github.com/gophish/gophish/config"
	ctx "github.com/gophish/gophish/context"
	mid "github.com/gophish/gophish/middleware"
	"github.com/gophish/gophish/models"
	"github.com/gorilla/csrf"
	"github.com/gorilla/mux"
	"github.com/gorilla/sessions"
)

// Logger is used to send logging messages to stdout.
var Logger = log.New(os.Stdout, " ", log.Ldate|log.Ltime|log.Lshortfile)

// CreateAdminRouter creates the routes for handling requests to the web interface.
// This function returns an http.Handler to be used in http.ListenAndServe().
func CreateAdminRouter() http.Handler {
	router := mux.NewRouter()
	// Base Front-end routes
	router.HandleFunc("/", Use(Base, mid.RequireLogin))
	router.HandleFunc("/login", Login)
	router.HandleFunc("/logout", Use(Logout, mid.RequireLogin))
	router.HandleFunc("/campaigns", Use(Campaigns, mid.RequireLogin))

	router.HandleFunc("/education", Use(Education, mid.RequireLogin))

	router.HandleFunc("/campaigns/{id:[0-9]+}", Use(CampaignID, mid.RequireLogin))
	router.HandleFunc("/templates", Use(Templates, mid.RequireLogin))
	router.HandleFunc("/users", Use(Users, mid.RequireLogin))
	router.HandleFunc("/landing_pages", Use(LandingPages, mid.RequireLogin))
	router.HandleFunc("/sending_profiles", Use(SendingProfiles, mid.RequireLogin))
	router.HandleFunc("/register", Use(Register, mid.RequireLogin))
	router.HandleFunc("/settings", Use(Settings, mid.RequireLogin))
	// Create the API routes
	api := router.PathPrefix("/api").Subrouter()
	api = api.StrictSlash(true)
	api.HandleFunc("/", Use(API, mid.RequireLogin))
	api.HandleFunc("/reset", Use(API_Reset, mid.RequireLogin))
	api.HandleFunc("/campaigns/", Use(API_Campaigns, mid.RequireAPIKey))
	api.HandleFunc("/campaigns/summary", Use(API_Campaigns_Summary, mid.RequireAPIKey))
	api.HandleFunc("/campaigns/{id:[0-9]+}", Use(API_Campaigns_Id, mid.RequireAPIKey))
	api.HandleFunc("/campaigns/{id:[0-9]+}/results", Use(API_Campaigns_Id_Results, mid.RequireAPIKey))
	api.HandleFunc("/campaigns/{id:[0-9]+}/summary", Use(API_Campaign_Id_Summary, mid.RequireAPIKey))
	api.HandleFunc("/campaigns/{id:[0-9]+}/complete", Use(API_Campaigns_Id_Complete, mid.RequireAPIKey))
	api.HandleFunc("/groups/", Use(API_Groups, mid.RequireAPIKey))
	api.HandleFunc("/groups/summary", Use(API_Groups_Summary, mid.RequireAPIKey))
	api.HandleFunc("/groups/{id:[0-9]+}", Use(API_Groups_Id, mid.RequireAPIKey))
	api.HandleFunc("/groups/{id:[0-9]+}/summary", Use(API_Groups_Id_Summary, mid.RequireAPIKey))
	api.HandleFunc("/templates/", Use(API_Templates, mid.RequireAPIKey))
	api.HandleFunc("/templates/{id:[0-9]+}", Use(API_Templates_Id, mid.RequireAPIKey))
	api.HandleFunc("/pages/", Use(API_Pages, mid.RequireAPIKey))
	api.HandleFunc("/pages/{id:[0-9]+}", Use(API_Pages_Id, mid.RequireAPIKey))
	api.HandleFunc("/smtp/", Use(API_SMTP, mid.RequireAPIKey))
	api.HandleFunc("/smtp/{id:[0-9]+}", Use(API_SMTP_Id, mid.RequireAPIKey))
	api.HandleFunc("/util/send_test_email", Use(API_Send_Test_Email, mid.RequireAPIKey))
	api.HandleFunc("/import/group", API_Import_Group)
	api.HandleFunc("/import/email", API_Import_Email)
	api.HandleFunc("/import/site", API_Import_Site)

	// Setup static file serving
	router.PathPrefix("/").Handler(http.FileServer(http.Dir("./static/")))

	// Setup CSRF Protection
	csrfHandler := csrf.Protect([]byte(auth.GenerateSecureKey()),
		csrf.FieldName("csrf_token"),
		csrf.Secure(config.Conf.AdminConf.UseTLS))
	csrfRouter := csrfHandler(router)
	return Use(csrfRouter.ServeHTTP, mid.CSRFExceptions, mid.GetContext)
}

// Use allows us to stack middleware to process the request
// Example taken from https://github.com/gorilla/mux/pull/36#issuecomment-25849172
func Use(handler http.HandlerFunc, mid ...func(http.Handler) http.HandlerFunc) http.HandlerFunc {
	for _, m := range mid {
		handler = m(handler)
	}
	return handler
}

// Register creates a new user
func Register(w http.ResponseWriter, r *http.Request) {
	// If it is a post request, attempt to register the account
	// Now that we are all registered, we can log the user in
	params := struct {
		Title   string
		Flashes []interface{}
		User    models.User
		Token   string
	}{Title: "Register", Token: csrf.Token(r)}
	session := ctx.Get(r, "session").(*sessions.Session)
	switch {
	case r.Method == "GET":
		params.Flashes = session.Flashes()
		session.Save(r, w)
		templates := template.New("template")
		_, err := templates.ParseFiles("templates/register.html", "templates/flashes.html")
		if err != nil {
			Logger.Println(err)
		}
		template.Must(templates, err).ExecuteTemplate(w, "base", params)
	case r.Method == "POST":
		//Attempt to register
		succ, err := auth.Register(r)
		//If we've registered, redirect to the login page
		if succ {
			session.AddFlash(models.Flash{
				Type:    "success",
				Message: "Registration successful!.",
			})
			session.Save(r, w)
			http.Redirect(w, r, "/login", 302)
			return
		}
		// Check the error
		m := err.Error()
		Logger.Println(err)
		session.AddFlash(models.Flash{
			Type:    "danger",
			Message: m,
		})
		session.Save(r, w)
		http.Redirect(w, r, "/register", 302)
		return
	}
}

// Base handles the default path and template execution
func Base(w http.ResponseWriter, r *http.Request) {
	params := struct {
		User    models.User
		Title   string
		Flashes []interface{}
		Token   string
	}{Title: "Dashboard", User: ctx.Get(r, "user").(models.User), Token: csrf.Token(r)}
	getTemplate(w, "dashboard").ExecuteTemplate(w, "base", params)
}

// Campaigns handles the default path and template execution
func Campaigns(w http.ResponseWriter, r *http.Request) {
	// Example of using session - will be removed.
	params := struct {
		User    models.User
		Title   string
		Flashes []interface{}
		Token   string
	}{Title: "Campaigns", User: ctx.Get(r, "user").(models.User), Token: csrf.Token(r)}
	getTemplate(w, "campaigns").ExecuteTemplate(w, "base", params)
}

// CampaignID handles the default path and template execution
func CampaignID(w http.ResponseWriter, r *http.Request) {
	// Example of using session - will be removed.
	params := struct {
		User    models.User
		Title   string
		Flashes []interface{}
		Token   string
	}{Title: "Campaign Results", User: ctx.Get(r, "user").(models.User), Token: csrf.Token(r)}
	getTemplate(w, "campaign_results").ExecuteTemplate(w, "base", params)
}

// Templates handles the default path and template execution
func Templates(w http.ResponseWriter, r *http.Request) {
	// Example of using session - will be removed.
	params := struct {
		User    models.User
		Title   string
		Flashes []interface{}
		Token   string
	}{Title: "Email Templates", User: ctx.Get(r, "user").(models.User), Token: csrf.Token(r)}
	getTemplate(w, "templates").ExecuteTemplate(w, "base", params)
}

// Users handles the default path and template execution
func Users(w http.ResponseWriter, r *http.Request) {
	// Example of using session - will be removed.
	params := struct {
		User    models.User
		Title   string
		Flashes []interface{}
		Token   string
	}{Title: "Users & Groups", User: ctx.Get(r, "user").(models.User), Token: csrf.Token(r)}
	getTemplate(w, "users").ExecuteTemplate(w, "base", params)
}

// LandingPages handles the default path and template execution
func LandingPages(w http.ResponseWriter, r *http.Request) {
	// Example of using session - will be removed.
	params := struct {
		User    models.User
		Title   string
		Flashes []interface{}
		Token   string
		List    []string
	}{Title: "Landing Pages", User: ctx.Get(r, "user").(models.User), Token: csrf.Token(r)}

	pwd, _ := os.Getwd()
	files, _ := filepath.Glob(pwd + "\\static\\endpoint\\[a-z,A-Z,0-9]*")
	//
	//files, _ := filepath.Glob("C:\\Users\\cpatterson\\Desktop\\gophish-master\\static\\endpoint/[a-z,A-Z,0-9]*")

	if len(files) > 0 {

		for index := range files {

			//Get the filename by splitting off the directory portion
			parts := strings.Split(files[index], "\\")
			string := parts[len(parts)-1]

			//Add this file to the list of files to be returned to the user
			params.List = append(params.List, string)
		}
	}

	getTemplate(w, "landing_pages").ExecuteTemplate(w, "base", params)
}

// SendingProfiles handles the default path and template execution
func SendingProfiles(w http.ResponseWriter, r *http.Request) {
	// Example of using session - will be removed.
	params := struct {
		User    models.User
		Title   string
		Flashes []interface{}
		Token   string
	}{Title: "Sending Profiles", User: ctx.Get(r, "user").(models.User), Token: csrf.Token(r)}
	getTemplate(w, "sending_profiles").ExecuteTemplate(w, "base", params)
}

//
//-----------------------------------------------------------------------------
//EDUCATION TEMPLATE FUNCTIONS
//-----------------------------------------------------------------------------
//

// Proxy struct holds templates found by server
type Proxy struct {
	Name string
	Body string
}

// Education handles the default path and template execution
func Education(w http.ResponseWriter, r *http.Request) {
	switch {
	case r.Method == "GET":
		params := struct {
			User    models.User
			Title   string
			Message string
			Token   string
			List    []Proxy
		}{Title: "Education", User: ctx.Get(r, "user").(models.User), Token: csrf.Token(r)}

		//Return a list of every file in the endpoint directory to return to the user, excluding the .gitignore, using relevant path
		pwd, _ := os.Getwd()
		files, _ := filepath.Glob(pwd + "\\static\\endpoint\\[a-z,A-Z,0-9]*")

		if len(files) > 0 {

			//For each file found in the list
			for index := range files {

				file, err := os.Stat(files[index])

				if err != nil {
					fmt.Println(err)
				}

				//Find the last time the file was modified
				modifiedtime := file.ModTime()

				//Get the filename by splitting off the directory portion
				parts := strings.Split(files[index], "\\")
				string := parts[len(parts)-1][:len(parts[len(parts)-1])-5]

				//Add this file to the list of files to be returned to the user
				params.List = append(params.List, Proxy{string, modifiedtime.Format("Mon Jan _2 15:04:05 2006")})

			}
		} else {

			//If there weren't any education template files found, display this message to the user
			params.Message = "No education templates created yet. Let's create one!"

		}

		//Execute the template and send it to the user
		getTemplate(w, "education").ExecuteTemplate(w, "base", params)

	//If we are receiving AJAX POST REQUESTS
	case r.Method == "POST":

		//PARSE THE FORM
		r.ParseForm()

		//For the actions specified, save the form as a file on disk, return the file contents to be edited, or delete the file on disk
		if r.Form.Get("action") == "SUBMIT" {

			pwd, _ := os.Getwd()

			err := ioutil.WriteFile(pwd+"\\static\\endpoint/"+r.Form.Get("name")+".html", []byte(r.Form.Get("body")), 0644)
			if err != nil {
				JSONResponse(w, "An error was encountered trying to save your file on server.", http.StatusOK)
			}

			JSONResponse(w, "Education page saved successfully.", http.StatusOK)

		} else if r.Form.Get("action") == "EDIT" {

			pwd, _ := os.Getwd()

			b, err := ioutil.ReadFile(pwd + "\\static\\endpoint/" + r.Form.Get("name") + ".html")
			if err != nil {
				JSONResponse(w, "An error was encountered attempting to retrieve the saved file on server.", http.StatusOK)
			}

			JSONResponse(w, string(b), http.StatusOK)

		} else if r.Form.Get("action") == "DELETE" {

			pwd, _ := os.Getwd()

			err := os.Remove(pwd + "\\static\\endpoint/" + r.Form.Get("name") + ".html")

			if err != nil {
				JSONResponse(w, "An error was encountered trying to delete the file on the server.", http.StatusOK)
				return
			}

			JSONResponse(w, "File deleted successfully.", http.StatusOK)

		}
	}
}

//
//--------------------------------------------------------------------------------------
//END OF EDUCATION TEMPLATE FUNCTIONS
//--------------------------------------------------------------------------------------
//

// Settings handles the changing of settings
func Settings(w http.ResponseWriter, r *http.Request) {
	switch {
	case r.Method == "GET":
		params := struct {
			User    models.User
			Title   string
			Flashes []interface{}
			Token   string
			Version string
		}{Title: "Settings", Version: config.Version, User: ctx.Get(r, "user").(models.User), Token: csrf.Token(r)}
		getTemplate(w, "settings").ExecuteTemplate(w, "base", params)
	case r.Method == "POST":
		err := auth.ChangePassword(r)
		msg := models.Response{Success: true, Message: "Settings Updated Successfully"}
		if err == auth.ErrInvalidPassword {
			msg.Message = "Invalid Password"
			msg.Success = false
			JSONResponse(w, msg, http.StatusBadRequest)
			return
		}
		if err != nil {
			msg.Message = err.Error()
			msg.Success = false
			JSONResponse(w, msg, http.StatusBadRequest)
			return
		}
		JSONResponse(w, msg, http.StatusOK)
	}
}

// Login handles the authentication flow for a user. If credentials are valid,
// a session is created
func Login(w http.ResponseWriter, r *http.Request) {
	params := struct {
		User    models.User
		Title   string
		Flashes []interface{}
		Token   string
	}{Title: "Login", Token: csrf.Token(r)}
	session := ctx.Get(r, "session").(*sessions.Session)
	switch {
	case r.Method == "GET":
		params.Flashes = session.Flashes()
		session.Save(r, w)
		templates := template.New("template")
		_, err := templates.ParseFiles("templates/login.html", "templates/flashes.html")
		if err != nil {
			Logger.Println(err)
		}
		template.Must(templates, err).ExecuteTemplate(w, "base", params)
	case r.Method == "POST":
		//Attempt to login
		succ, u, err := auth.Login(r)
		if err != nil {
			Logger.Println(err)
		}
		//If we've logged in, save the session and redirect to the dashboard
		if succ {
			session.Values["id"] = u.Id
			session.Save(r, w)
			http.Redirect(w, r, "/", 302)
		} else {
			Flash(w, r, "danger", "Invalid Username/Password")
			http.Redirect(w, r, "/login", 302)
		}
	}
}

// Logout destroys the current user session
func Logout(w http.ResponseWriter, r *http.Request) {
	// If it is a post request, attempt to register the account
	// Now that we are all registered, we can log the user in
	session := ctx.Get(r, "session").(*sessions.Session)
	delete(session.Values, "id")
	Flash(w, r, "success", "You have successfully logged out")
	http.Redirect(w, r, "/login", 302)
}

// Preview allows for the viewing of page html in a separate browser window
func Preview(w http.ResponseWriter, r *http.Request) {
	if r.Method != "POST" {
		http.Error(w, "Method not allowed", http.StatusBadRequest)
		return
	}
	fmt.Fprintf(w, "%s", r.FormValue("html"))
}

// Clone takes a URL as a POST parameter and returns the site HTML
func Clone(w http.ResponseWriter, r *http.Request) {
	vars := mux.Vars(r)
	if r.Method != "POST" {
		http.Error(w, "Method not allowed", http.StatusBadRequest)
		return
	}
	if url, ok := vars["url"]; ok {
		Logger.Println(url)
	}
	http.Error(w, "No URL given.", http.StatusBadRequest)
}

func getTemplate(w http.ResponseWriter, tmpl string) *template.Template {
	templates := template.New("template")
	_, err := templates.ParseFiles("templates/base.html", "templates/"+tmpl+".html", "templates/flashes.html")
	if err != nil {
		Logger.Println(err)
	}
	return template.Must(templates, err)
}

// Flash handles the rendering flash messages
func Flash(w http.ResponseWriter, r *http.Request, t string, m string) {
	session := ctx.Get(r, "session").(*sessions.Session)
	session.AddFlash(models.Flash{
		Type:    t,
		Message: m,
	})
	session.Save(r, w)
}