// Package server is a placeholder for the HTTP surface that lets non-Go
// callers (skills, agents, otto) drive imagen without exec-ing the CLI.
//
// The CLI already covers the v0 use cases, so this package intentionally
// ships only an interface and a 501 stub. A follow-up issue (tracked after
// the ComfyUI + Replicate adapters land) will flesh it out.
package server

import (
	"fmt"
	"net/http"
)

// Server is the eventual HTTP shape. Concrete implementations can wrap a
// backend.Registry + config.Config and expose POST /v1/generate.
type Server interface {
	Handler() http.Handler
}

// NotImplemented is the placeholder the CLI wires up if someone calls
// `imagen serve` before the real server lands.
type NotImplemented struct{}

// Handler returns an http.Handler that responds 501 to every request.
func (NotImplemented) Handler() http.Handler {
	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		w.Header().Set("Content-Type", "text/plain; charset=utf-8")
		w.WriteHeader(http.StatusNotImplemented)
		fmt.Fprintln(w, "imagen HTTP server: not implemented yet — use the CLI for now")
	})
}