1 | import React from 'react'
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2 |
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3 |
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4 | function calculateHandValue(cards) {
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5 | let value = 0;
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6 | let aces = 0;
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7 | for (let i = 0; i < cards.length; i++) {
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8 | let card = cards[i];
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9 | if (card.substring(1) === 'A') {
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10 | value += 11;
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11 | aces++;
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12 | } else if (card.substring(1) === 'X' || card.substring(1) === 'J' || card.substring(1) === 'Q' || card.substring(1) === 'K') {
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13 | value += 10;
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14 | } else {
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15 | value += parseInt(card.substring(1));
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16 | }
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17 | }
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18 | while (value > 21 && aces > 0) {
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19 | value -= 10;
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20 | aces--;
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21 | }
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22 | return value;
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23 | }
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24 |
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25 | const hands = [
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26 | 'Royal Flush',
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27 | 'Straight Flush',
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28 | 'Four of a Kind',
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29 | 'Full House',
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30 | 'Flush',
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31 | 'Straight',
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32 | 'Three of a Kind',
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33 | 'Two Pairs',
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34 | 'Pair',
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35 | 'High Card',
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36 | ]
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37 |
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38 | const order = "23456789XJQKA"
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39 | function getHandDetails(hand) {
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40 | const cards = hand
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41 | const faces = cards.map(a => String.fromCharCode([77 - order.indexOf(a[1])])).sort()
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42 | const suits = cards.map(a => a[0]).sort()
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43 | const counts = faces.reduce(count, {})
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44 | const duplicates = Object.values(counts).reduce(count, {})
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45 | const flush = suits[0] === suits[4]
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46 | const first = faces[0].charCodeAt(1)
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47 | const straight = faces.every((f, index) => f.charCodeAt(1) - first === index)
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48 | let rank =
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49 | (flush && straight && 1) ||
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50 | (duplicates[4] && 2) ||
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51 | (duplicates[3] && duplicates[2] && 3) ||
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52 | (flush && 4) ||
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53 | (straight && 5) ||
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54 | (duplicates[3] && 6) ||
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55 | (duplicates[2] > 1 && 7) ||
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56 | (duplicates[2] && 8) ||
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57 | 9;
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58 |
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59 | return { hand: hands[rank], highCard: faces.sort(byCountFirst).join("") }
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60 |
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61 | function byCountFirst(a, b) {
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62 | //Counts are in reverse order - bigger is better
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63 | const countDiff = counts[b] - counts[a]
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64 | if (countDiff) return countDiff // If counts don't match return
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65 | return b > a ? -1 : b === a ? 0 : 1
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66 | }
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67 |
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68 | function count(c, a) {
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69 | c[a] = (c[a] || 0) + 1
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70 | return c
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71 | }
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72 | }
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73 |
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74 | function compareHands(h1, h2) {
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75 | let d1 = getHandDetails(h1)
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76 | let d2 = getHandDetails(h2)
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77 | if (hands.indexOf(d1.hand) === hands.indexOf(d2.hand)) {
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78 | if (d1.highCard < d2.highCard) {
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79 | return d2;
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80 | } else if (d1.highCard > d2.highCard) {
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81 | return d1;
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82 | } else {
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83 | return d1;
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84 | }
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85 | }
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86 | return hands.indexOf(d1.hand) < hands.indexOf(d2.hand) ? d2 : d1;
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87 | }
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88 |
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89 | function getBestHandDetails(playerCards, tableCards) {
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90 | let combinations = getCardCombinations(playerCards, tableCards);
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91 |
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92 | let h1 = combinations[0];
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93 | let bestHand = h1;
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94 | combinations.forEach(combination => {
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95 | bestHand = compareHands(h1, combination);
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96 | h1 = combination;
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97 | })
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98 |
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99 | return bestHand;
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100 | }
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101 |
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102 | function getCardCombinations(playerCards, tableCards) {
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103 | let combinations = [];
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104 |
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105 | if (tableCards[3] !== undefined) {
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106 | combinations.push([playerCards[0], tableCards[0], tableCards[1], tableCards[2], tableCards[3]])
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107 | combinations.push([playerCards[1], tableCards[0], tableCards[1], tableCards[2], tableCards[3]])
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108 | combinations.push([playerCards[0], playerCards[1], tableCards[0], tableCards[1], tableCards[3]])
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109 | combinations.push([playerCards[0], playerCards[1], tableCards[0], tableCards[2], tableCards[3]])
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110 | combinations.push([playerCards[0], playerCards[1], tableCards[1], tableCards[2], tableCards[3]])
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111 | }
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112 |
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113 | if (tableCards[4] !== undefined) {
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114 | combinations.push([playerCards[0], tableCards[0], tableCards[1], tableCards[2], tableCards[4]])
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115 | combinations.push([playerCards[0], tableCards[0], tableCards[1], tableCards[4], tableCards[3]])
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116 | combinations.push([playerCards[0], tableCards[0], tableCards[4], tableCards[2], tableCards[3]])
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117 | combinations.push([playerCards[0], tableCards[4], tableCards[1], tableCards[2], tableCards[3]])
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118 |
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119 | combinations.push([playerCards[1], tableCards[0], tableCards[1], tableCards[2], tableCards[4]])
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120 | combinations.push([playerCards[1], tableCards[0], tableCards[1], tableCards[4], tableCards[3]])
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121 | combinations.push([playerCards[1], tableCards[0], tableCards[4], tableCards[2], tableCards[3]])
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122 | combinations.push([playerCards[1], tableCards[4], tableCards[1], tableCards[2], tableCards[3]])
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123 | combinations.push([playerCards[0], playerCards[1], tableCards[0], tableCards[1], tableCards[4]])
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124 |
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125 | combinations.push([playerCards[0], playerCards[1], tableCards[0], tableCards[2], tableCards[4]])
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126 | combinations.push([playerCards[0], playerCards[1], tableCards[0], tableCards[3], tableCards[4]])
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127 | combinations.push([playerCards[0], playerCards[1], tableCards[1], tableCards[2], tableCards[4]])
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128 | combinations.push([playerCards[0], playerCards[1], tableCards[1], tableCards[3], tableCards[4]])
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129 |
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130 | combinations.push([playerCards[0], playerCards[1], tableCards[2], tableCards[3], tableCards[4]])
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131 | }
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132 |
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133 | combinations.push([playerCards[0], playerCards[1], tableCards[0], tableCards[1], tableCards[2]])
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134 |
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135 | return combinations;
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136 | }
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137 |
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138 | const Calculations = ({action, cards, cards2}) => {
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139 | if (action === 'calculateHandValue') {
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140 | return (
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141 | <>
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142 | {calculateHandValue(cards)}
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143 | </>
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144 | )
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145 | }
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146 | else {
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147 | return (
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148 | <>
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149 | { cards.length > 0 && cards2.length > 0 && getBestHandDetails(cards, cards2).hand}
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150 | { (cards.length === 0 || cards2.length === 0) && <span>-</span>}
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151 | </>
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152 | )
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153 | }
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154 | }
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155 |
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156 | export default Calculations
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