package tome_lib

import (
	"fmt"
	"math/rand"
	"time"
)

type Deck struct {
	Cards []*Card `json:"cards"`
}

func (d *Deck) String() string {
	if d == nil {
		return "||"
	}
	return fmt.Sprintf("|%v|", d.Cards)
}

func DeckFromCards(c []*Card) *Deck {
	return &Deck{
		Cards: c,
	}
}

func (d *Deck) Shuffle() {
	r := rand.New(rand.NewSource(time.Now().UnixNano()))
	for i := range d.Cards {
		j := r.Intn(i + 1)
		d.Cards[i], d.Cards[j] = d.Cards[j], d.Cards[i]
	}
}

func (d *Deck) Scry(s int) []*Card {
	seen := []*Card{}
	if len(d.Cards) < s {
		seen = d.Cards
		d.Cards = []*Card{}
		return seen
	}
	seen = d.Cards[(len(d.Cards) - s):len(d.Cards)]
	d.Cards = d.Cards[0 : len(d.Cards)-s]
	return seen
}

func (d *Deck) Bottom(result []*Card) {
	d.Cards = append(result, d.Cards...) //Should shuffle result first?
}

func (d *Deck) Size() int {
	return len(d.Cards)
}