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package browser
import (
"fmt"
"github.com/raitonoberu/sptlrx/player"
"io"
"net"
"net/http"
"strconv"
"strings"
"sync"
"time"
"github.com/coder/websocket"
)
const helloMessage = "ADAPTER_VERSION 1.0.0;WNPRLIB_REVISION 2"
type state int
const (
stopped state = iota
paused
playing
)
func New(port int) (*Client, error) {
c := &Client{}
return c, c.start(port)
}
// Client implements player.Player
type Client struct {
state state
position int
title string
artist string
updateTime time.Time
stateMu sync.Mutex
connMu sync.Mutex
}
func (c *Client) handler(w http.ResponseWriter, r *http.Request) {
// make sure we only have one connection
c.connMu.Lock()
defer c.connMu.Unlock()
conn, err := websocket.Accept(w, r, &websocket.AcceptOptions{
InsecureSkipVerify: true,
})
if err != nil {
return
}
defer conn.Close(websocket.StatusInternalError, "internal error")
writer, err := conn.Writer(r.Context(), websocket.MessageText)
if err != nil {
return
}
writer.Write([]byte(helloMessage))
writer.Close()
for {
t, reader, err := conn.Reader(r.Context())
if err != nil {
return
}
msg, err := io.ReadAll(reader)
if err != nil {
return
}
if t != websocket.MessageText || len(msg) == 0 {
continue
}
c.processMessage(string(msg))
}
}
func (c *Client) processMessage(msg string) {
spaceIndex := strings.IndexByte(msg, ' ')
if spaceIndex == -1 {
return
}
msgType := strings.ToUpper(msg[:spaceIndex])
data := msg[spaceIndex+1:]
// we are not doing global locking here because
// we are not interested in most of the messages
switch msgType {
case "STATE":
c.stateMu.Lock()
switch data {
case "PLAYING":
c.state = playing
case "PAUSED":
c.state = paused
case "STOPPED":
c.state = stopped
}
c.stateMu.Unlock()
case "TITLE":
c.stateMu.Lock()
c.title = data
c.stateMu.Unlock()
case "ARTIST":
c.stateMu.Lock()
c.artist = data
c.stateMu.Unlock()
case "POSITION_SECONDS":
pos, _ := strconv.Atoi(data)
c.stateMu.Lock()
c.position = pos * 1000
c.updateTime = time.Now()
c.stateMu.Unlock()
}
}
func (c *Client) start(port int) error {
l, err := net.Listen("tcp", fmt.Sprintf("127.0.0.1:%d", port))
if err != nil {
return err
}
server := &http.Server{
Handler: http.HandlerFunc(c.handler),
}
go server.Serve(l)
return nil
}
func (c *Client) State() (*player.State, error) {
c.stateMu.Lock()
defer c.stateMu.Unlock()
if c.state == stopped {
return nil, nil
}
var query string
if c.artist != "" {
query = c.artist + " " + c.title
} else {
query = c.title
}
position := c.position
if c.state != paused {
position += int(time.Since(c.updateTime).Milliseconds())
}
return &player.State{
ID: query,
Query: query,
Position: position,
Playing: c.state == playing,
}, nil
}
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