package main

import (
	"encoding/json"
	"fmt"
	"regexp"
	"strconv"
	"strings"
)

type Players [16]Player

type Game struct {
	Pot     Currency
	Players Players
}

type Player struct {
	ID      string
	Name    string
	Card    string
	Balance Currency
}

type Currency int

func (game Game) GetPlayers() []Player {
	players := []Player{}
	for _, player := range game.Players {
		if !player.Empty() {
			players = append(players, player)
		}
	}
	return players
}

func (p Player) Empty() bool {
	return p == (Player{})
}

func (c Currency) MarshalJSON() ([]byte, error) {
	return json.Marshal(fmt.Sprintf(`$%v.%02d`, c/100, c%100))
}

func (c *Currency) UnmarshalJSON(b []byte) error {
	var s string
	if err := json.Unmarshal(b, &s); err != nil {
		return err
	}
	re := regexp.MustCompile(`^\$([0-9]+(\.[0-9][0-9])?|\.[0-9]{2})$`)
	if !re.MatchString(s) {
		return fmt.Errorf("illegal currency format: %q", s)
	}
	s = strings.TrimPrefix(s, "$")
	dollars := strings.Split(s, ".")[0]
	cents := strings.TrimPrefix(s, dollars+".")
	if !strings.HasPrefix(s, dollars+".") {
		cents = "0"
	}
	if dollars == "" {
		dollars = "0"
	}
	if cents == "00" {
		cents = "0"
	}
	dI, err := strconv.Atoi(dollars)
	if err != nil {
		return err
	}
	cI, err := strconv.Atoi(cents)
	if err != nil {
		return err
	}
	c2 := Currency(dI*100 + cI)
	*c = c2
	return nil
}