package app

import (
	"os"

	"github.com/revel/log15"
	"github.com/revel/revel"
)

func init() {
	// Filters is the default set of global filters.
	revel.Filters = []revel.Filter{
		revel.PanicFilter,             // Recover from panics and display an error page instead.
		revel.RouterFilter,            // Use the routing table to select the right Action
		revel.FilterConfiguringFilter, // A hook for adding or removing per-Action filters.
		revel.ParamsFilter,            // Parse parameters into Controller.Params.
		revel.SessionFilter,           // Restore and write the session cookie.
		revel.FlashFilter,             // Restore and write the flash cookie.
		revel.ValidationFilter,        // Restore kept validation errors and save new ones from cookie.
		revel.I18nFilter,              // Resolve the requested language
		HeaderFilter,                  // Add some security based headers
		revel.InterceptorFilter,       // Run interceptors around the action.
		revel.CompressFilter,          // Compress the result.
		revel.ActionInvoker,           // Invoke the action.
	}

	// register startup functions with OnAppStart
	// ( order dependent )
	// revel.OnAppStart(InitDB)
	// revel.OnAppStart(FillCache)
	revel.OnAppStart(InitLogger)
}

// HeaderFilter is a default set of headers to be added
// TODO turn this into revel.HeaderFilter
// should probably also have a filter for CSRF
// not sure if it can go in the same filter or not
var HeaderFilter = func(c *revel.Controller, fc []revel.Filter) {
	// Add some common security headers
	c.Response.Out.Header().Add("X-Frame-Options", "SAMEORIGIN")
	c.Response.Out.Header().Add("X-XSS-Protection", "1; mode=block")
	c.Response.Out.Header().Add("X-Content-Type-Options", "nosniff")

	fc[0](c, fc[1:]) // Execute the next filter stage.
}

// InitLogger initializes the logging handler
func InitLogger() {

	// If we are running inside kubernetes, use the oklog logger
	if os.Getenv("KUBERNETES_SERVICE_HOST") != "" {
		h, err := log15.NetHandler("tcp", "oklog.log:7651", log15.JsonFormat())
		if err != nil {
			revel.AppLog.Error("failed to construct network log handler", "error", err)
			return
		}
		revel.RevelLog.SetHandler(h)
	}
}