path: root/internal/game/render_roulette.go

package game

import (
	"fmt"
	"strconv"
	"strings"

	"thehouseoficarus/internal/casino"
	"thehouseoficarus/internal/color"
	"thehouseoficarus/internal/net"
)

// Roulette art is rendered per recipient, just like cards. Never embed ANSI
// in engine snapshots: spectators may have different color/Unicode settings.
func renderRouletteSnapshot(s *casino.RouletteSnapshot, mode string, unicode bool, size int) string {
	switch s.Phase {
	case "playing":
		return renderRouletteWheel(s.Wheel, mode, unicode)
	case "result":
		return renderRouletteResult(s.Pockets, mode, unicode, size)
	default:
		return renderRouletteLayout(s.DoubleZero, mode, unicode)
	}
}

func rouletteInk(mode, text string) string {
	return color.Render(mode, color.ColorSpec{Fg: 15, Bg: -1}, text)
}

// Use the basic palette so both ANSI-16 and xterm256 give white-on-red,
// white-on-green and white-on-black, rather than approximating a gradient.
func roulettePaint(mode, text string, bg int) string {
	return color.Render(mode, color.ColorSpec{Fg: 15, Bg: bg, Bold: true}, text)
}

func roulettePocketColor(pocket string) (int, string) {
	if pocket == "0" || pocket == "00" {
		return 2, "GREEN"
	}
	n, _ := strconv.Atoi(pocket)
	switch n {
	case 1, 3, 5, 7, 9, 12, 14, 16, 18, 19, 21, 23, 25, 27, 30, 32, 34, 36:
		return 1, "RED"
	default:
		return 0, "BLACK"
	}
}

func rouletteCenter(text string, width int) string {
	pad := max(0, width-color.VisibleLen(text))
	return strings.Repeat(" ", pad/2) + text + strings.Repeat(" ", pad-pad/2)
}

type rouletteLines struct{ h, v, tl, tr, bl, br, teeTop, teeBottom, teeLeft, teeRight, cross string }

func rouletteBorders(unicode bool) rouletteLines {
	if unicode {
		return rouletteLines{"─", "│", "┌", "┐", "└", "┘", "┬", "┴", "├", "┤", "┼"}
	}
	return rouletteLines{"-", "|", "+", "+", "+", "+", "+", "+", "+", "+", "+"}
}

func repeatRoulette(s string, n int) []string {
	parts := make([]string, n)
	for i := range parts {
		parts[i] = s
	}
	return parts
}

// renderRouletteLayout draws the betting board. Green is reserved for the
// 0/00 lane: every other cell is red, black, or plain. The odds reminder is
// not part of the board (it is shown by the "table" command), so the board
// stays compact enough to sit in a betting menu.
func renderRouletteLayout(double bool, mode string, unicode bool) string {
	b := rouletteBorders(unicode)
	var lines []string
	title := "ROULETTE / SINGLE ZERO"
	if double {
		title = "ROULETTE / DOUBLE ZERO"
	}
	lines = append(lines, rouletteInk(mode, title))
	// Five columns for the zero lane, twelve four-column pockets. Four
	// adjacent pockets line up exactly over each 19-column dozen.
	gridRule := func(left, joint, right string) string {
		return left + strings.Repeat(b.h, 5) + joint + strings.Join(repeatRoulette(strings.Repeat(b.h, 4), 12), joint) + right
	}
	lines = append(lines, rouletteInk(mode, gridRule(b.tl, b.teeTop, b.tr)))
	for row := 3; row >= 1; row-- {
		zero, zeroBg := "", -1
		switch {
		case double && row == 3:
			zero, zeroBg = "0", 2
		case double && row == 1:
			zero, zeroBg = "00", 2
		case !double && row == 2:
			zero, zeroBg = "0", 2
		}
		if zeroBg == 2 && (mode == "none" || mode == "") {
			zero += "G"
		}
		line := rouletteInk(mode, b.v) + roulettePaint(mode, rouletteCenter(zero, 5), zeroBg) + rouletteInk(mode, b.v)
		for n := row; n <= 36; n += 3 {
			pocket := strconv.Itoa(n)
			bg, name := roulettePocketColor(pocket)
			if mode == "none" || mode == "" {
				pocket += name[:1]
			}
			line += roulettePaint(mode, rouletteCenter(pocket, 4), bg) + rouletteInk(mode, b.v)
		}
		line += rouletteInk(mode, fmt.Sprintf(" column%d", row))
		lines = append(lines, line)
		if row > 1 {
			// The zero lane spans the grid height; only its labeled cell is green.
			line = rouletteInk(mode, b.v+"     "+b.teeLeft+strings.Join(repeatRoulette(strings.Repeat(b.h, 4), 12), b.cross)+b.teeRight)
			lines = append(lines, line)
		}
	}
	lines = append(lines, rouletteInk(mode, gridRule(b.bl, b.teeBottom, b.br)))
	// Outside bets share the exact 60-column numbered-grid footprint.
	indent := "      "
	dozen := indent + rouletteInk(mode, b.v)
	for i := 1; i <= 3; i++ {
		dozen += rouletteInk(mode, rouletteCenter(fmt.Sprintf("dozen%d", i), 19)) + rouletteInk(mode, b.v)
	}
	lines = append(lines, dozen)
	line := indent + rouletteInk(mode, b.v)
	for _, bet := range []string{"low", "even", "red", "black", "odd", "high"} {
		bg := -1
		if bet == "red" {
			bg = 1
		}
		if bet == "black" {
			bg = 0
		}
		line += roulettePaint(mode, rouletteCenter(bet, 9), bg) + rouletteInk(mode, b.v)
	}
	lines = append(lines, line, rouletteInk(mode, indent+b.bl+strings.Repeat(b.h, 59)+b.br))
	if mode == "none" || mode == "" {
		lines = append(lines, "R = red, B = black, G = green")
	}
	return strings.Join(lines, "\n")
}

// rouletteWheelSlots are the pocket anchor points (clockwise from the top) for
// the single-zero ring. The double-zero ring inserts one extra slot at the
// bottom centre. This hand-tuned geometry is what keeps a full 37/38-pocket
// circle readable in a monospace terminal.
var rouletteWheelSlots = [][2]int{
	{25, 0}, {33, 0}, {41, 0}, {46, 1}, {50, 2}, {53, 3}, {57, 4}, {59, 6}, {59, 7},
	{60, 9}, {61, 11}, {60, 13}, {58, 15}, {58, 16}, {56, 18}, {54, 19}, {50, 20},
	{46, 21}, {41, 22}, {33, 22}, {25, 22}, {20, 21}, {17, 20}, {13, 19}, {9, 18},
	{7, 17}, {5, 16}, {4, 14}, {3, 12}, {3, 10}, {4, 8}, {7, 6}, {9, 5}, {12, 4},
	{14, 3}, {17, 2}, {21, 1},
}

func rouletteWheelSlotsFor(double bool) [][2]int {
	slots := append([][2]int(nil), rouletteWheelSlots...)
	if !double {
		return slots
	}
	insert := 20 // between {33,22} and {25,22}
	slots = append(slots, [2]int{})
	copy(slots[insert+1:], slots[insert:])
	slots[insert] = [2]int{29, 22}
	return slots
}

// roulettePocketToken renders one three-column pocket. With color it is just
// the number; without color a trailing letter keeps red/black/green distinct.
func roulettePocketToken(value, label, mode string) string {
	if mode == "none" || mode == "" {
		switch len(value) {
		case 1:
			return value + label[:1] + " "
		case 2:
			return value + label[:1]
		default:
			return value
		}
	}
	return rouletteCenter(value, 3)
}

type rouletteCell struct {
	r  rune
	bg int
}

// renderRouletteWheel draws a large circular wheel. The pocket count carries
// the real zero count (one green for single zero, two for American), and the
// hub shows the ball during the spin.
func renderRouletteWheel(wheel []string, mode string, unicode bool) string {
	double := false
	for _, p := range wheel {
		if p == "00" {
			double = true
		}
	}
	slots := rouletteWheelSlotsFor(double)
	if len(wheel) != len(slots) {
		slots = rouletteWheelSlots
		if len(wheel) > len(slots) {
			wheel = wheel[:len(slots)]
		}
	}
	const width, height = 68, 23
	grid := make([][]rouletteCell, height)
	for y := range grid {
		grid[y] = make([]rouletteCell, width)
		for x := range grid[y] {
			grid[y][x] = rouletteCell{' ', -1}
		}
	}
	place := func(x, y int, s string, bg int) {
		for k, r := range []rune(s) {
			px := x + k
			if px >= 0 && px < width && y >= 0 && y < height {
				grid[y][px] = rouletteCell{r, bg}
			}
		}
	}
	for i, value := range wheel {
		if i >= len(slots) {
			break
		}
		bg, label := roulettePocketColor(value)
		place(slots[i][0]-1, slots[i][1], roulettePocketToken(value, label, mode), bg)
	}
	hub := []string{"\\   |   /", " \\  |  / ", "--( o )--", " /  |  \\ ", "/   |   \\"}
	if unicode {
		hub = []string{"╲   │   ╱", " ╲  │  ╱ ", "──( ● )──", " ╱  │  ╲ ", "╱   │   ╲"}
	}
	for k, text := range hub {
		place(29, 9+k, text, -1)
	}
	lines := make([]string, 0, height)
	for _, row := range grid {
		lines = append(lines, renderRouletteRow(row, mode))
	}
	return strings.Join(lines, "\n")
}

func renderRouletteRow(row []rouletteCell, mode string) string {
	last := len(row)
	for last > 0 && row[last-1].r == ' ' {
		last--
	}
	if last == 0 {
		return ""
	}
	var sb strings.Builder
	for i := 0; i < last; {
		bg := row[i].bg
		j := i
		var seg []rune
		for j < last && row[j].bg == bg {
			seg = append(seg, row[j].r)
			j++
		}
		text := string(seg)
		if bg >= 0 && mode != "none" && mode != "" {
			sb.WriteString(roulettePaint(mode, text, bg))
		} else {
			sb.WriteString(rouletteInk(mode, text))
		}
		i = j
	}
	return sb.String()
}

// renderRouletteResult draws the winning pocket and its two physical
// neighbours at playing-card size. The ball marks the middle pocket; there is
// no surrounding prose.
func renderRouletteResult(pockets [3]string, mode string, unicode bool, size int) string {
	size = cardRenderSize(unicode, size)
	if size < 5 {
		size = 5
	}
	width := size + 2
	b := rouletteBorders(unicode)
	ball := "o"
	if unicode {
		ball = "●"
	}
	var lines []string
	for row := 0; row < size; row++ {
		var cells []string
		for i, pocket := range pockets {
			bg, name := roulettePocketColor(pocket)
			var text string
			switch row {
			case 0:
				text = b.tl + strings.Repeat(b.h, width-2) + b.tr
			case size - 1:
				text = b.bl + strings.Repeat(b.h, width-2) + b.br
			default:
				content := ""
				if row == 1 {
					content = name
				}
				if row == size/2 {
					content = pocket
				}
				if i == 1 && row == size/2+1 {
					content = ball
				}
				text = b.v + rouletteCenter(content, width-2) + b.v
			}
			cells = append(cells, roulettePaint(mode, text, bg))
		}
		lines = append(lines, strings.Join(cells, " "))
	}
	return strings.Join(lines, "\n")
}

// rouletteReminder is the odds/cheat-sheet block, shown only by "table" (and
// "table rules"), never with the ambient betting board.
func (g *Game) rouletteReminder(sess *net.Session) string {
	text := "Numbers 35:1 | Dozens / columns 2:1 | Other outside bets 1:1\n" +
		"Low: 1-18 | High: 19-36 | Zero loses all outside bets\n" +
		"bet 10 on 17  /  bet 10 on red  /  bet 10 on dozen2"
	return g.colorize(sess, "casino_action", text)
}

func (g *Game) renderCasinoRules(sess *net.Session, cfg casino.TableConfig) string {
	rules := g.colorize(sess, "casino_action", cfg.RulesText())
	if cfg.Game == casino.GameRoulette {
		snap := &casino.RouletteSnapshot{DoubleZero: cfg.Roulette.DoubleZero, Phase: "betting", Wheel: casino.WheelOrder(cfg.Roulette.DoubleZero)}
		rules += "\n" + g.renderCasinoSnapshot(sess, snap) + "\n" + g.rouletteReminder(sess)
	}
	return rules
}