package data

import (
	"encoding/base64"
	"encoding/json"
	"errors"
	"log"
	"os"
	"time"

	rgb "github.com/foresthoffman/rgblog"
	redis "github.com/gomodule/redigo/redis"
	uuid "github.com/google/uuid"
)

// ConfigStruct is the base for the config file
type ConfigStruct struct {
	InitialChannels []string `json:"channels"`
	IrcOAuthPath    string   `json:"ircoauthpath,omitempty"`
	StringPath      string   `json:"authpath,omitempty"`
	DataPath        string   `json:"datapath,omitempty"`
	ExternalURL     string   `json:"externalurl,omitempty"`
	AppOAuthPath    string   `json:"appoauthpath,omitempty"`
	DatabaseSVC     string   `json:"databasesvc,omitempty"`
}

// CommandType Kinda an enum
type CommandType string

// CommandType literals
const (
	RandomSinger CommandType = "RandomSinger"
	RandomPrompt CommandType = "RandomPrompt"
	RandomSong   CommandType = "RandomSong"
	AgingSinger  CommandType = "AgingSinger"
	AgingSong    CommandType = "AgingSong"
)

// IsValid Is CommandType a valid enum?
func (ct CommandType) IsValid() error {
	switch ct {
	case RandomSinger, RandomPrompt, RandomSong, AgingSinger, AgingSong:
		return nil
	}
	return errors.New("Invalid command type")
}

// ChannelData is what we store in the BitRaft (Redis) database
type ChannelData struct {
	ControlChannel    bool
	Name              string             `json:"name"`
	AdminKey          string             `json:"value,omitempty"`
	Commands          []CommandStruct    `json:"commands,omitempty"`
	ExtraStrings      string             `json:"extrastrings,omitempty"`
	JoinTime          time.Time          `json:"jointime"`
	HasLeft           bool               `json:"hasleft"`
	VideoCache        []SingsVideoStruct `json:"videoCache"`
	VideoCacheUpdated time.Time          `json:"videoCacheUpdated"`
	Bearer            string             `json:"bearer"`
	TwitchUserID      string             `json:"twitchUserID"`
}

// SingsVideoStruct The data we pull from Twitch
type SingsVideoStruct struct {
	Date           time.Time `json:"date"`           // Golang date of creation
	FullTitle      string    `json:"fullTitle"`      // Full Title
	Duet           bool      `json:"duet"`           // Is it a duet?
	OtherSinger    string    `json:"otherSinger"`    // Twitch NAME of the other singer, extracted from the title
	SongTitle      string    `json:"songTitle"`      // extracted from title
	LastSungSong   time.Time `json:"LastSungSong"`   // Last time this SONG was sung
	LastSungSinger time.Time `json:"LastSungSinger"` // Last time a duet was sung with this SINGER, regardless of song, only Duets have this date initialised
	VideoURL       string    `json:"VideoURL"`       // RIP Twitch Sings
}

// CommandStruct keypair for irc command -> actual thing to do
type CommandStruct struct {
	CommandName CommandType `json:"commandName"`
	KeyWord     string      `json:"keyword"`
}

// GlobalData Some kind of architect would kill me for this
type GlobalData struct {
	ChannelData    map[string]ChannelData
	Config         ConfigStruct
	Database       redis.Conn
	ControlChannel string
}

// ConnectDatabase Connects to the database set in the config struct
func (gd *GlobalData) ConnectDatabase() {
	var err error
	rgb.YPrintf("[%s] Connecting to \"redis\" %s...\n", TimeStamp(), gd.Config.DatabaseSVC, err)
	gd.Database, err = redis.Dial("tcp", gd.Config.DatabaseSVC+":4920")
	if err != nil {
		rgb.RPrintf("[%s] Failed connecting to \"redis\" %s : %s\n", TimeStamp(), gd.Config.DatabaseSVC, err)
		os.Exit(1)
	}
	rgb.YPrintf("[%s] No error... wtf?\n", TimeStamp())
}

// UpdateVideoCache Updates the in-memory data and updates redis
func (gd *GlobalData) UpdateVideoCache(user string, videos []SingsVideoStruct) {
	record := gd.ChannelData[user]
	rgb.YPrintf("Replacing cache of %d performances with a new cache of %d performances\n", len(record.VideoCache), len(videos))
	record.VideoCache = videos
	record.VideoCacheUpdated = time.Now()
	asJson, _ := json.Marshal(record)
	_, err := gd.Database.Do("SET", user, asJson)
	if err != nil {
		log.Fatal(err)
	}
	gd.ChannelData[user] = record
}

func (gd *GlobalData) UpdateBearerToken(user string, token string) {
	record := gd.ChannelData[user]
	record.Bearer = token
	asJson, _ := json.Marshal(record)
	gd.Database.Do("SET", user, asJson)
	gd.ChannelData[user] = record
}

func (gd *GlobalData) UpdateTwitchUserID(user string, userid string) {
	record := gd.ChannelData[user]
	record.TwitchUserID = userid
	asJson, _ := json.Marshal(record)
	gd.Database.Do("SET", user, asJson)
	gd.ChannelData[user] = record
}

func (gd *GlobalData) UpdateChannelKey(user string, channelKey string) {
	record := gd.ChannelData[user]
	record.AdminKey = channelKey
	asJson, _ := json.Marshal(record)
	gd.Database.Do("SET", user, asJson)
	gd.ChannelData[user] = record
}

func (gd *GlobalData) UpdateChannelName(user string, newName string) {
	record := gd.ChannelData[user]
	record.Name = newName
	asJson, _ := json.Marshal(record)
	gd.Database.Do("SET", newName, asJson)
	gd.ChannelData[newName] = record
	//dunno why we'd need this but I guess in case?
	if newName != user {
		delete(gd.ChannelData, user)
		gd.Database.Do("DEL", newName)
	}
}

func (gd *GlobalData) UpdateJoined(user string, invert bool) {
	record := gd.ChannelData[user]

	if record.Name == "" {
		record = ChannelData{Name: user, JoinTime: time.Now(), Commands: nil, ControlChannel: true}
	}
	record.JoinTime = time.Now()
	asJson, _ := json.Marshal(record)
	if invert {
		record.HasLeft = true
	} else {
		record.HasLeft = false
	}
	gd.Database.Do("SET", user, asJson)
	gd.ChannelData[user] = record
}

func (gd *GlobalData) ReadChannelData() error {
	keys, err := redis.Strings(gd.Database.Do("KEYS", "*"))
	if err != nil {
		rgb.RPrintf("[%s] ERROR with redis fetch : %s\n", TimeStamp(), err.Error())
		rgb.YPrintf("[%s] Maybe an empty redis, creating a record...\n", TimeStamp())
		keys = []string{}
	}
	if len(keys) == 0 {
		rgb.YPrintf("[%s] Looks like an empty redis, creating a record...\n", TimeStamp())
		record := ChannelData{Name: gd.ControlChannel, JoinTime: time.Now(), Commands: nil}
		asJSON, _ := json.Marshal(record)
		gd.Database.Do("SET", gd.ControlChannel, asJSON)
		keys = []string{gd.ControlChannel}
	}
	rgb.YPrintf("[%s] \"redis\" has %d records!\n", TimeStamp(), len(keys))
	for _, channel := range keys {
		fetchedData, err := redis.String(gd.Database.Do("GET", channel))
		if err != nil {
			rgb.YPrintf("[%s] failed to read key %s from redis, good luck!...\n", TimeStamp(), channel)
		}
		rgb.YPrintf("[%s] data from \"redis\" for %s is %s\n", TimeStamp(), channel, fetchedData)
		cd := gd.ChannelData
		if cd == nil {
			cd = make(map[string]ChannelData)
		}
		d := &ChannelData{}
		err = json.Unmarshal([]byte(fetchedData), d)
		if err != nil {
			rgb.RPrintf("[%s] channel data could not be unmarshalled : %s\n", TimeStamp(), err.Error())
		}
		cd[channel] = *d
		gd.ChannelData = cd
		rgb.YPrintf("[%s] channel data : %v\n", TimeStamp(), gd.ChannelData)
	}
	// Managed to leave the main channel!?
	rgb.YPrintf("[%s] Read channel data for %d channels\n", TimeStamp(), len(gd.ChannelData))
	return nil
}

func (gd *GlobalData) ReadOrCreateChannelKey(channel string) string {
	record := gd.ChannelData[channel]
	magicCode := ""
	if record.AdminKey == "" {
		rgb.YPrintf("[%s] No channel key for #%s exists, creating one\n", TimeStamp(), channel)
		newuu, _ := uuid.NewRandom()
		magicCode = base64.StdEncoding.EncodeToString([]byte(newuu.String()))
		gd.UpdateJoined(channel, true)
		gd.UpdateChannelKey(channel, magicCode)
		gd.UpdateChannelName(channel, channel)
		rgb.YPrintf("[%s] Cached channel key for #%s\n", TimeStamp(), record.Name)
	} else {
		magicCode = record.AdminKey
		rgb.YPrintf("[%s] Loaded data for #%s\n", TimeStamp(), channel)
	}
	return magicCode
}

const UTCFormat = "Jan 2 15:04:05 UTC"

func TimeStamp() string {
	return TimeStampFmt(UTCFormat)
}

func TimeStampFmt(format string) string {
	return time.Now().Format(format)
}