// package function is an example of a Function implementation.
//
// This package name can be changed when using the "host" builder
// (as can the module name in go.mod)
package function

import (
	"fmt"
	"net/http"
)

// MyFunction is the function provided by this library.
// This structure name can be changed.
type MyFunction struct{}

// New constructs an instance of your function.  It is called each time a new
// instance of the function service is created.  This function must be named
// "New", accept no arguments, and return a structure which exports at least
// a Handle method (and optionally any of the additional methods described
// in the comments below).
func New() *MyFunction {
	return &MyFunction{}
}

// Handle a request using your function instance.
func (f *MyFunction) Handle(res http.ResponseWriter, req *http.Request) {
	fmt.Println("Request received")
	fmt.Fprintf(res, "Request received\n")
}

// Start is called whenever a function instance is started.
//
// Provided to this start method are all arguments and environment variables
// which apply to this function.  For better function portability, testability
// and robustness, it is encouraged to use this method for accessing function
// configuration rather than looking for environment variables or flags.
// func (f *MyFunction) Start(ctx context.Context, args map[string]string) error {
//   fmt.Println("Function Started")
//   return nil
// }

// Stop is called whenever a function is stopped.
//
// This may happen for reasons such as being rescheduled onto a different node,
// being updated with a newer version, or if the number of function instances
// is being scaled down due to low load.  This is a good place to cleanup and
// realease any resources which expect to be manually released.
//
// func (f *Function) Stop(ctx context.Context) error { return nil }

// Alive is an optional method which allows you to more deeply indicate that
// your function is alive.  The default liveness implementation returns true
// if the function process is not deadlocked and able to respond.  A custom
// implementation of this method may be useful when a function should not be
// considered alive if any dependent services are alive, or other more
// complex logic.
//
// func (f *Function) Alive(ctx context.Context) (bool, error) {
//   return true, nil
// }

// Ready is an optional method which, when implemented, will ensure that
// requests are not made to the Function's request handler until this method
// reports true.
//
// func (f *Function) Ready(ctx context.Context) (bool, error) {
//   return true, nil
// }

// Handle is an optional method which can be used to implement simple functions
// with little or no state, and minimal testing requirements.  By implementing
// this package static function, one can forego the constructor and struct
// outlined above.  Note that if this method is defined, the system will ignore
// the instanced function constructor if it is defined.
//
// func Handle(ctx context.Context, res http.ResponseWriter, req *http.Request) {
//   /* Your Static Handler Code Here */
// }