package achievements

import (
	"database/sql"
	"fmt"
	bh "github.com/timshannon/bolthold"
	"regexp"
	"strings"
	"time"

	"github.com/rs/zerolog/log"

	"github.com/velour/catbase/bot"
	"github.com/velour/catbase/bot/msg"
	"github.com/velour/catbase/config"
)

// A plugin to track our misdeeds
type AchievementsPlugin struct {
	bot   bot.Bot
	cfg   *config.Config
	store *bh.Store
}

func New(b bot.Bot) *AchievementsPlugin {
	ap := &AchievementsPlugin{
		bot:   b,
		cfg:   b.Config(),
		store: b.Store(),
	}

	ap.register()

	return ap
}

var grantRegex = regexp.MustCompile(`(?i)grant (?P<emojy>(?::[[:word:][:punct:]]+:\s?)+) to :?(?P<nick>[[:word:]]+):?`)
var createRegex = regexp.MustCompile(`(?i)create trophy (?P<emojy>(?::[[:word:][:punct:]]+:\s?)+) (?P<description>.+)`)
var greatRegex = regexp.MustCompile(`(?i)how great (?:am i|is :?(?P<who>[[:word:]]+))[[:punct:]]*`)
var listRegex = regexp.MustCompile(`(?i)^list (?P<whos>.+)?\s?trophies$`)

func (p *AchievementsPlugin) register() {
	p.bot.RegisterRegexCmd(p, bot.Message, grantRegex, p.grantCmd)
	p.bot.RegisterRegexCmd(p, bot.Message, createRegex, p.createCmd)
	p.bot.RegisterRegexCmd(p, bot.Message, greatRegex, p.greatCmd)
	p.bot.RegisterRegexCmd(p, bot.Message, listRegex, p.listCmd)
	p.bot.Register(p, bot.Help, p.help)
}

func (p *AchievementsPlugin) GetAwards(nick string) []Award {
	var awards []Award
	err := p.store.Find(&awards, bh.Where("holder").Eq(nick))
	if err != nil {
		log.Error().Err(err).Msg("could not select awards")
	}
	return awards
}

func (p *AchievementsPlugin) listCmd(r bot.Request) bool {
	log.Debug().Msgf("Values: %+v", r.Values)
	whos := strings.TrimSpace(r.Values["whos"])
	if whos == "my" {
		whos = r.Msg.User.Name
	}
	log.Debug().Msgf("whos = %s", whos)
	ts, err := p.AllTrophies()
	if err != nil {
		p.bot.Send(r.Conn, bot.Message, r.Msg.Channel, "Some problem happened.")
		log.Error().Err(err).Msg("could not retrieve trophies")
		return true
	}
	if len(ts) == 0 {
		p.bot.Send(r.Conn, bot.Message, r.Msg.Channel, "There are no trophies.")
		return true
	}
	msg := "Current trophies:\n"
	log.Debug().Msgf("Trophies: %s", ts)
	for _, t := range ts {
		log.Debug().Msgf("t.Creator = %s", t.Creator)
		if strings.TrimSpace(t.Creator) == whos {
			log.Debug().Msgf("adding %s", t)
			msg += fmt.Sprintf("%s - %s\n", t.Emojy, t.Description)
		} else if whos == "" {
			msg += fmt.Sprintf("%s - %s (by %s)\n", t.Emojy, t.Description, t.Creator)
		}
	}
	p.bot.Send(r.Conn, bot.Message, r.Msg.Channel, strings.TrimSpace(msg))
	return true
}

func (p *AchievementsPlugin) grantCmd(r bot.Request) bool {
	nick := r.Msg.User.Name
	emojy := r.Values["emojy"]
	receiver := r.Values["nick"]
	trophy, err := p.FindTrophy(emojy)
	if err != nil {
		log.Error().Err(err).Msg("could not find trophy")
		msg := fmt.Sprintf("The %s award doesn't exist.", emojy)
		p.bot.Send(r.Conn, bot.Message, r.Msg.Channel, msg)
		return true
	}
	if nick == trophy.Creator {
		a, err := p.Grant(receiver, emojy)
		if err != nil {
			log.Error().Err(err).Msg("could not award trophy")
		}
		msg := fmt.Sprintf("Congrats %s. You just got the %s award for %s.",
			receiver, emojy, a.Description)
		p.bot.Send(r.Conn, bot.Message, r.Msg.Channel, msg)
	} else {
		msg := fmt.Sprintf("Sorry, %s. %s owns that trophy.", nick, trophy.Creator)
		p.bot.Send(r.Conn, bot.Message, r.Msg.Channel, msg)
	}
	return true
}

func (p *AchievementsPlugin) createCmd(r bot.Request) bool {
	nick := r.Msg.User.Name
	emojy := r.Values["emojy"]
	description := r.Values["description"]
	t, err := p.Create(emojy, description, nick)
	if err != nil {
		log.Error().Err(err).Msg("could not create trophy")
		if strings.Contains(err.Error(), "exists") {
			p.bot.Send(r.Conn, bot.Message, r.Msg.Channel, err.Error())
			return true
		}
		p.bot.Send(r.Conn, bot.Message, r.Msg.Channel, "I'm too humble to ever award that trophy")
		return true
	}
	resp := fmt.Sprintf("Okay %s. I have crafted a one-of-a-kind %s trophy to give for %s",
		nick, t.Emojy, t.Description)
	p.bot.Send(r.Conn, bot.Message, r.Msg.Channel, resp)
	return true
}

func (p *AchievementsPlugin) greatCmd(r bot.Request) bool {
	nick := r.Msg.User.Name
	who := r.Values["who"]
	if who == "" {
		who = nick
	}
	awards := p.GetAwards(who)
	if len(awards) == 0 {
		m := fmt.Sprintf("%s has no achievements to their name. They really suck.", who)
		if who == nick {
			m = fmt.Sprintf("You have no achievements to your name. "+
				"You are a sad and terrible specimen of the human condition, %s.", who)
		}
		p.bot.Send(r.Conn, bot.Message, r.Msg.Channel, m)
	} else {
		m := fmt.Sprintf("Wow, let's all clap for %s. Look at these awards:", who)
		for _, a := range awards {
			m += fmt.Sprintf("\n%s - %s", a.Emojy, a.Description)
		}
		p.bot.Send(r.Conn, bot.Message, r.Msg.Channel, m)
	}
	return true
}

func (p *AchievementsPlugin) help(c bot.Connector, kind bot.Kind, message msg.Message, args ...interface{}) bool {
	ch := message.Channel
	me := p.bot.WhoAmI()
	msg := "The achievements plugins awards trophies."
	msg += fmt.Sprintf("\nYou can create a trophy with `%s, create trophy <emojy> <description>`", me)
	msg += fmt.Sprintf("\nYou can award a trophy with `%s, grant <emojy> to <nick>`", me)
	msg += "\nYou can see others awards with `How great is <nick>`"
	msg += "\nYou can see your awards with `How great am I?`"
	p.bot.Send(c, bot.Message, ch, msg)
	return true
}

// Award is used by other plugins to register a particular award for a user
func (p *AchievementsPlugin) Grant(nick, emojy string) (Award, error) {
	trophy, err := p.FindTrophy(emojy)
	if err != nil {
		return Award{}, err
	}
	award := Award{
		Holder:      nick,
		Emojy:       emojy,
		Description: trophy.Description,
		Granted:     sql.NullTime{Time: time.Now()},
	}
	if err = p.store.Insert(bh.NextSequence(), &award); err != nil {
		return Award{}, err
	}

	return award, err
}

func (p *AchievementsPlugin) Create(emojy, description, creator string) (Trophy, error) {
	t, err := p.FindTrophy(emojy)
	if err == nil {
		return t, fmt.Errorf("the trophy %s already exists", emojy)
	}

	t = Trophy{
		Emojy:       emojy,
		Description: description,
		Creator:     creator,
	}

	err = p.store.Insert(emojy, t)
	return t, err
}

type Trophy struct {
	Emojy       string `boltholderKey:"Emojy"`
	Description string
	Creator     string
}

type Award struct {
	ID          uint64 `boltholderKey:"ID"`
	Emojy       string
	Description string
	Holder      string
	Amount      int64
	Granted     sql.NullTime
}

func (p *AchievementsPlugin) AllTrophies() ([]Trophy, error) {
	var t []Trophy
	err := p.store.Find(&t, &bh.Query{})
	return t, err
}

func (p *AchievementsPlugin) FindTrophy(emojy string) (Trophy, error) {
	var t Trophy
	err := p.store.Find(&t, bh.Where("emojy").Eq(emojy))
	return t, err
}