package main

import (
  "github.com/kataras/iris"
  "github.com/kataras/go-template/html"
  "fmt"
  "git.mmnx.de/Moe/databaseutils"
  "git.mmnx.de/Moe/usermanager"
  "git.mmnx.de/Moe/configutils"
  "golang.org/x/crypto/bcrypt"
  "errors"
)

type pageUserParams struct{
  HasError string
  Error string
  ReqDir string
  Username string
  Email string
  Admin string
  } // {Error: ""}

func main() {

  conf := configutils.ReadConfig("config.json") // read config
  configutils.Conf = &conf // store conf globally accessible

  databaseutils.DBUtil = &databaseutils.DBUtils{configutils.Conf.DBUser, configutils.Conf.DBPass, configutils.Conf.DBHost, configutils.Conf.DBName, nil} // init dbutils
  databaseutils.DBUtil.Connect() // connect to db

  users := make([]usermanager.User, 0) // users list
  usermanager.Users = &users // store globally accessible

  fmt.Print("") // for not needing to remove fmt ...

  iris.Config.IsDevelopment = true
  //iris.Config.Render.Template.Gzip = true

  /** HELPER FUNCTION EXAMPLE **/
    /*config := html.DefaultConfig()
    config.Layout = "layouts/main.html"
    config.Helpers["boldme"] = func(input string) raymond.SafeString {
      return raymond.SafeString("<b> " + input + "</b>")
    }*/

  /** ROUTING **/

  iris.UseTemplate(html.New(html.Config{
    Layout: "layouts/main.html",
  }))

  iris.Static("/js", "./static/js", 1)
  iris.Static("/css", "./static/css", 1)
  iris.Static("/img", "./static/img", 1)
  iris.Static("/static", "./static/static", 1)

  iris.Post("/login", loginHandler) // login form handler
  iris.Post("/account", usermanager.AuthHandler, accountUpdateHandler)
  iris.Post("/admin", usermanager.AuthHandler, usermanager.AdminHandler, adminPostHandler)

  iris.Get("/login", templateHandler)
	iris.Get("/", usermanager.AuthHandler, templateHandler)
  iris.Get("/account", usermanager.AuthHandler, templateHandler)
  iris.Get("/help", usermanager.AuthHandler, templateHandler)

  iris.Get("/admin", usermanager.AuthHandler, usermanager.AdminHandler, func(ctx *iris.Context) { // TODO integrate in outsource (templateHandler)
    userID := ctx.GetString("userID")
    user, err := usermanager.GetUser(userID)

    tokens, err := databaseutils.DBUtil.GetRows("*", "tokens", "used", "0") // get unused tokens
    if err != nil {
      fmt.Println(err.Error()) // TODO: nicer
    }

    message := "" // string for textarea output in /admin

    for i, _ := range tokens {
      message += tokens[i][1] + "\n"
    }

    params := usermanager.PageUserParamsMessage{"0", "", "admin", user.Username, "", user.Admin, message}
		if err := ctx.Render("admin_box.html", params); err != nil {
			println(err.Error())
		}
	})

  /** OTHER **/

  iris.Listen(":8080")
}

func loginHandler(ctx *iris.Context) {
  username := ctx.FormValueString("username") // POST values from login form
  password := ctx.FormValueString("password")

  user := usermanager.User{} // new user
  tokenString, err := user.Login(username, password) // try to login

  if err != nil {
    ctx.Render("login_box.html", usermanager.PageParams{"1", err.Error(), "login", "0"})
  } else {
    ctx.SetCookieKV("token", tokenString)
    ctx.Redirect("/")
    // TODO: error-alternative success (main.html)
  }
}

func accountUpdateHandler(ctx *iris.Context) { // TODO tidy up?
  err := errors.New(""); err = nil
  username := ctx.FormValueString("username") // POST values
  password := ctx.FormValueString("password")
  userID := ctx.GetString("userID")
  usersArrayID := usermanager.SearchUser(userID)
  user := (*usermanager.Users)[usersArrayID] // user must be logged in to do this -> get from users list

  if username != "" && usermanager.SearchUserByUsername(username) != -1 && username != user.Username { // username can't be changed as there already exists a user with that name or it's the old name
    ctx.Render("account_box.html", usermanager.PageUserParams{"1", errors.New("Username already taken").Error(), "account", user.Username, user.Mail, user.Admin})
    return
  }

  needQuery := false

  if username != "" { // if not left empty (-> change)
    needQuery = true
  } else {
    username = user.Username // keep
  }

  hashedPassword := user.Password // we assumpt the user's not changing his password

  if password != "" { // if not left empty we change it
    needQuery = true
    hashedPassword, err = func (hashedPassword []byte, err error) (string, error) { // hash password, we use an anonymous function to convert it to string
      if err != nil { // should never happen
        ctx.Render("account_box.html", usermanager.PageUserParams{"1", err.Error(), "account", user.Username, user.Mail, user.Admin})
        return "", err
      }
      return string(hashedPassword), nil
    }(bcrypt.GenerateFromPassword([]byte(password), 15)) // this is the actual hashing call
    if err != nil { // should never happen
      ctx.Render("account_box.html", usermanager.PageUserParams{"1", err.Error(), "account", user.Username, user.Mail, user.Admin})
      return
    }
  }

  if !needQuery { // we don't need to update anything
    ctx.Render("account_box.html", usermanager.PageUserParams{"1", errors.New("nothing to update").Error(), "account", user.Username, user.Mail, user.Admin})
    return
  }

  (*usermanager.Users)[usermanager.SearchUser(userID)].Username = username // update values in runtime users list
  (*usermanager.Users)[usermanager.SearchUser(userID)].Password = hashedPassword

  err = (*usermanager.Users)[usermanager.SearchUser(userID)].Update() // try to update in db
  if err != nil { // failed to update
    ctx.Render("account_box.html", usermanager.PageUserParams{"1", err.Error(), "account", user.Username, user.Mail, user.Admin})
    return
  }

  // TODO success notifications

  if err != nil {
    ctx.Render("account_box.html", usermanager.PageUserParams{"1", err.Error(), "account", user.Username, user.Mail, user.Admin}) // TODO dynamic
  } else {
    ctx.Render("account_box.html", usermanager.PageUserParams{"0", "", "account", user.Username, user.Mail, user.Admin}) // TODO dynamic
  }
}

func adminPostHandler(ctx *iris.Context) {
  err := errors.New(""); err = nil
  userID := ctx.GetString("userID")
  usersArrayID := usermanager.SearchUser(userID)

  err = usermanager.GenerateTokens(5) // tokens

  if err != nil {
    ctx.Render("admin_box.html", usermanager.PageUserParams{"1", err.Error(), "admin", user.Username, user.Mail, user.Admin}) // TODO dynamic
    fmt.Println(err.Error())
    return
  }

  ctx.Redirect("/admin") // just redirect so that we see old+new tokens

  // TODO success notifications

}

func templateHandler(ctx *iris.Context) {
  template := ""
  switch ctx.RequestPath(false) {
  case "/":
    template = "home"
  case "/account":
    template = "account"
  case "/help":
    template = "help"
  case "/admin":
    template = "admin"
  case "/login":
    template = "login"
  }

  // fmt.Println(ctx.RequestPath(false))

  // fmt.Println(template)

  userID := ctx.GetString("userID")
  user, err := usermanager.GetUser(userID)
  if err != nil { // user is apparently not logged in -> login
    ctx.MustRender("login_box.html", pageUserParams{"1", err.Error(), template, "", "", "0"})
    return
  }

  params := usermanager.PageUserParams{"0", "", template, user.Username, "", user.Admin}
  ctx.MustRender(template + "_box.html", params);

}