package main

import (
	"encoding/json"
	"fmt"
)

type ytm struct {
	props  *properties
	env    environmentInfo
	status playStatus
	artist string
	track  string
}

const (
	// APIURL is the YTMDA Remote Control API URL property.
	APIURL Property = "api_url"
)

func (y *ytm) string() string {
	icon := ""
	separator := y.props.getString(TrackSeparator, " - ")
	switch y.status {
	case paused:
		icon = y.props.getString(PausedIcon, "\uF8E3 ")
	case playing:
		icon = y.props.getString(PlayingIcon, "\uE602 ")
	case stopped:
		return y.props.getString(StoppedIcon, "\uF04D ")
	}
	return fmt.Sprintf("%s%s%s%s", icon, y.artist, separator, y.track)
}

func (y *ytm) enabled() bool {
	err := y.setStatus()
	// If we don't get a response back (error), the user isn't running
	// YTMDA, or they don't have the RC API enabled.
	return err == nil
}

func (y *ytm) init(props *properties, env environmentInfo) {
	y.props = props
	y.env = env
}

type playStatus int

const (
	playing playStatus = iota
	paused
	stopped
)

type ytmdaStatusResponse struct {
	player `json:"player"`
	track  `json:"track"`
}

type player struct {
	HasSong                     bool    `json:"hasSong"`
	IsPaused                    bool    `json:"isPaused"`
	VolumePercent               int     `json:"volumePercent"`
	SeekbarCurrentPosition      int     `json:"seekbarCurrentPosition"`
	SeekbarCurrentPositionHuman string  `json:"seekbarCurrentPositionHuman"`
	StatePercent                float64 `json:"statePercent"`
	LikeStatus                  string  `json:"likeStatus"`
	RepeatType                  string  `json:"repeatType"`
}

type track struct {
	Author          string `json:"author"`
	Title           string `json:"title"`
	Album           string `json:"album"`
	Cover           string `json:"cover"`
	Duration        int    `json:"duration"`
	DurationHuman   string `json:"durationHuman"`
	URL             string `json:"url"`
	ID              string `json:"id"`
	IsVideo         bool   `json:"isVideo"`
	IsAdvertisement bool   `json:"isAdvertisement"`
	InLibrary       bool   `json:"inLibrary"`
}

func (y *ytm) setStatus() error {
	// https://github.com/ytmdesktop/ytmdesktop/wiki/Remote-Control-API
	url := y.props.getString(APIURL, "http://localhost:9863")
	body, err := y.env.doGet(url + "/query")
	if err != nil {
		return err
	}
	q := new(ytmdaStatusResponse)
	err = json.Unmarshal(body, &q)
	if err != nil {
		return err
	}
	y.status = playing
	if !q.player.HasSong {
		y.status = stopped
	} else if q.player.IsPaused {
		y.status = paused
	}
	y.artist = q.track.Author
	y.track = q.track.Title
	return nil
}