package main

import (
	"encoding/json"
	"fmt"
	"io/ioutil"
	"net/http"

	"github.com/charmbracelet/log"
	"github.com/spf13/viper"
	"maunium.net/go/mautrix/id"
)

type vtuberConfig struct {
	Name      string `mapstructure:"name"`
	ChannelID string `mapstructure:"channelid"`
	LiveMsg   string `mapstructure:"msg"`
	Announce  bool   `mapstructure:"Announce"`
}

// Vtuber represents a vtuber
type Vtuber struct {
	Name               string
	ChannelID          string
	CurrentStream      string
	CurrentStreamTitle string
	LiveMsg            string
	AnnounceLive       bool
	TotalStreams       int
	Subs               map[id.UserID]bool
}

func newVtuber(name, channelID, liveMsg string, announce bool) *Vtuber {
	return &Vtuber{
		Name:               name,
		ChannelID:          channelID,
		CurrentStream:      "",
		CurrentStreamTitle: "",
		LiveMsg:            liveMsg,
		AnnounceLive:       announce,
		TotalStreams:       0,
		Subs:               make(map[id.UserID]bool),
	}
}

func loadVtubers() []*Vtuber {
	var vtubersRaw []vtuberConfig
	var vtubers []*Vtuber
	err := viper.UnmarshalKey("vtubers", &vtubersRaw)
	if err != nil {
		panic(err)
	}
	for _, vt := range vtubersRaw {
		log.Infof("adding vtuber %v", vt)
		vtubers = append(vtubers, newVtuber(vt.Name, vt.ChannelID, vt.LiveMsg, vt.Announce))
	}
	return vtubers
}

// IsLive returns whether the specified Vtuber is live
func (v *Vtuber) IsLive() bool {
	return v.CurrentStream != ""
}

// Update takes an apiKey and updates the vtuber struct
func (v *Vtuber) Update(apiKey string) error {
	url := fmt.Sprintf(
		"https://holodex.net/api/v2/live?channel_id=%s&lang=all&sort=available_at&order=desc&limit=25&offset=0&paginated=%%3Cempty%%3E",
		v.ChannelID,
	)
	req, err := http.NewRequest("GET", url, nil)
	req.Header.Set("X-APIKEY", apiKey)
	if err != nil {
		return fmt.Errorf("error creating GET %w", err)
	}
	res, err := http.DefaultClient.Do(req)
	if err != nil {
		return fmt.Errorf("error sending request %w", err)
	}
	defer res.Body.Close()
	if res.StatusCode != 200 {
		return fmt.Errorf("bad status code %v", res.StatusCode)
	}
	jsonBody, err := ioutil.ReadAll(res.Body)
	if err != nil {
		return fmt.Errorf("error reading response: %w", err)
	}
	var sl StreamList
	err = json.Unmarshal(jsonBody, &sl)
	if err != nil {
		return fmt.Errorf("error marshalling vtuber: %w %v", err, string(jsonBody))
	}
	found := false
	for _, s := range sl.Streams {
		if s.Status == "live" {
			v.CurrentStream = s.ID
			v.CurrentStreamTitle = s.Title
			found = true
		}
	}
	if !found {
		v.CurrentStream = ""
		v.CurrentStreamTitle = ""
	}
	return nil
}