package main

import (
	"bytes"
	"encoding/json"
	"html/template"
	"log"
	"net/http"
	"sync"
)

var geoJSONTmpl = template.Must(template.New("geojson").Parse(
	`{ "type": "Feature",
  "geometry": {
    "type": "Point",
    "coordinates": [{{.X}}, {{.Z}}]
  },
  "properties": {
    "name": {{.Name || html }}
  }
}`))

type player struct {
	X    float64
	Y    float64
	Z    float64
	Name string
}

type players struct {
	fifo string
	wsf  *websocketForwarder
	pls  []*player
	mu   sync.RWMutex
}

func newPlayers(fifo string, wsf *websocketForwarder) *players {
	return &players{fifo: fifo, wsf: wsf}
}

func (p *player) MarshalJSON() ([]byte, error) {
	var buf bytes.Buffer
	if err := geoJSONTmpl.Execute(&buf, p); err != nil {
		return nil, err
	}
	return buf.Bytes(), nil
}

func (ps *players) run() {
	for {
		// TODO: Implement me!
	}
}

func (ps *players) ServeHTTP(rw http.ResponseWriter, r *http.Request) {
	rw.Header().Set("Content-Type", "application/json")
	ps.mu.RLock()
	defer ps.mu.RUnlock()
	encoder := json.NewEncoder(rw)
	if err := encoder.Encode(ps.pls); err != nil {
		log.Printf("error: sending JSON failed: %s\n", err)
	}
}