package main

import (
	"container/ring"
	"fmt"
	"net/http"

	"github.com/gin-gonic/gin"
	melody "gopkg.in/olahol/melody.v1"
)

func main() {
	gin.SetMode(gin.ReleaseMode)

	r := gin.Default()
	m := melody.New()

	history := ring.New(10)

	r.GET("/", func(c *gin.Context) {
		http.ServeFile(c.Writer, c.Request, "index.html")
	})

	r.GET("/ws", func(c *gin.Context) {
		m.HandleRequest(c.Writer, c.Request)
	})

	r.POST("/update", func(c *gin.Context) {
		artist := c.PostForm("artist")
		title := c.PostForm("title")
		if artist == "" || title == "" {
			c.JSON(http.StatusBadRequest, gin.H{
				"status": "failure",
			})
			return
		}
		metadata := fmt.Sprintf("%s - %s", artist, title)

		c.JSON(http.StatusOK, gin.H{
			"status": "success",
		})

		for j := 0; j < 10; j++ {
			if history.Value == metadata {
				history = history.Next()
				return
			}
			history = history.Next()
		}

		m.Broadcast([]byte(metadata))
		history.Value = metadata
		history = history.Next()
	})

	m.HandleConnect(func(s *melody.Session) {
		for j := 0; j < 10; j++ {
			if history.Value != nil {
				s.Write([]byte(history.Value.(string)))
			}
			history = history.Next()
		}
	})

	r.Run(":1338")
}