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hello.go
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hello.go
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package hello
import (
"net/http"
"github.com/go-martini/martini"
"github.com/martini-contrib/cors"
"github.com/martini-contrib/render"
"math/rand"
"strconv"
"sort"
)
type Resources struct {
Name string `json:"name"`
URI string `json:"uri"`
Methods string `json:"methods"`
}
type Card struct {
Suit string `json:"suit"`
Number int `json:"number"`
}
//deck
var cards = []Card{{Suit: "Spades", Number: 2},{Suit: "Spades", Number: 3},{Suit: "Spades", Number: 4},{Suit: "Spades", Number: 5},{Suit: "Spades", Number: 6},{Suit: "Spades", Number: 7},{Suit: "Spades", Number: 8},{Suit: "Spades", Number: 9},{Suit: "Spades", Number: 10},{Suit: "Spades", Number: 11},{Suit: "Spades", Number: 12},{Suit: "Spades", Number: 13},{Suit: "Spades", Number: 14},{Suit: "Hearts", Number: 2},{Suit: "Hearts", Number: 3},{Suit: "Hearts", Number: 4},{Suit: "Hearts", Number: 5},{Suit: "Hearts", Number: 6},{Suit: "Hearts", Number: 7},{Suit: "Hearts", Number: 8},{Suit: "Hearts", Number: 9},{Suit: "Hearts", Number: 10},{Suit: "Hearts", Number: 11},{Suit: "Hearts", Number: 12},{Suit: "Hearts", Number: 13},{Suit: "Hearts", Number: 14},{Suit: "Diamonds", Number: 2},{Suit: "Diamonds", Number: 3},{Suit: "Diamonds", Number: 4},{Suit: "Diamonds", Number: 5},{Suit: "Diamonds", Number: 6},{Suit: "Diamonds", Number: 7},{Suit: "Diamonds", Number: 8},{Suit: "Diamonds", Number: 9},{Suit: "Diamonds", Number: 10},{Suit: "Diamonds", Number: 11},{Suit: "Diamonds", Number: 12},{Suit: "Diamonds", Number: 13},{Suit: "Diamonds", Number: 14},{Suit: "Clubs", Number: 2},{Suit: "Clubs", Number: 3},{Suit: "Clubs", Number: 4},{Suit: "Clubs", Number: 5},{Suit: "Clubs", Number: 6},{Suit: "Clubs", Number: 7},{Suit: "Clubs", Number: 8},{Suit: "Clubs", Number: 9},{Suit: "Clubs", Number: 10},{Suit: "Clubs", Number: 11},{Suit: "Clubs", Number: 12},{Suit: "Clubs", Number: 13},{Suit: "Clubs", Number: 14}}
//shuffle
func Shuffle(slc []Card) {
for i := 1; i < len(slc); i++ {
r := rand.Intn(i + 1)
if i != r {
slc[r], slc[i] = slc[i], slc[r]
}
}
}
// mutli sorting taken from http://golang.org/pkg/sort/
type lessFunc func(p1, p2 *Card) bool
// multiSorter implements the Sort interface, sorting the cards within.
type multiSorter struct {
cards []Card
less []lessFunc
}
// Sort sorts the argument slice according to the less functions passed to OrderedBy.
func (ms *multiSorter) Sort(cards []Card) {
ms.cards = cards
sort.Sort(ms)
}
// OrderedBy returns a Sorter that sorts using the less functions, in order.
// Call its Sort method to sort the data.
func OrderedBy(less ...lessFunc) *multiSorter {
return &multiSorter{
less: less,
}
}
func (ms *multiSorter) Len() int {
return len(ms.cards)
}
func (ms *multiSorter) Swap(i, j int) {
ms.cards[i], ms.cards[j] = ms.cards[j], ms.cards[i]
}
func (ms *multiSorter) Less(i, j int) bool {
p, q := &ms.cards[i], &ms.cards[j]
var k int
for k = 0; k < len(ms.less)-1; k++ {
less := ms.less[k]
switch {
case less(p, q):
return true
case less(q, p):
return false
}
}
return ms.less[k](p, q)
}
func init() {
m := martini.Classic()
allowCORSHandler := cors.Allow(&cors.Options{
AllowOrigins: []string{"*"},
AllowMethods: []string{"GET", "POST"},
AllowHeaders: []string{"Origin"},
})
m.Use(render.Renderer(render.Options{
IndentJSON: true, // Output human readable JSON
}))
m.Get("/", allowCORSHandler, func(r render.Render) {
Shuffle(cards)
json := []Resources{{Name: "cards", URI: "/cards/{players}", Methods: "GET"}}
r.JSON(200, json)
})
m.Get("/cards", allowCORSHandler, func(r render.Render) {
Shuffle(cards)
r.JSON(200, cards)
})
m.Get("/cards/:players", allowCORSHandler, func(args martini.Params, r render.Render) {
Shuffle(cards)
//use Atoi as ParseInt always does int64
p, _ := strconv.Atoi(args["players"])
if(p==0 || p>52){
//not valid number
r.JSON(200, cards)
} else {
var total = len(cards)
var start = 0
var split = total/p
//for sorting by suit and number
suit := func(c1, c2 *Card) bool {
return c1.Suit < c2.Suit
}
numbers := func(c1, c2 *Card) bool {
return c1.Number < c2.Number
}
//make a multidiemnsional array in Go (http://rosettacode.org/wiki/Create_a_two-dimensional_array_at_runtime#Go) with as many items in array as players so we can loop and fill below
var a = make([][]Card,p)
for i := range a {
var psplit = cards[start:start+split];
// Sort by Number and Suit
OrderedBy(suit, numbers).Sort(psplit)
a[i]=psplit
start=start+split
}
//kitty
var kittycards = cards[start:total]
r.JSON(200, map[string]interface{}{"players": a, "kitty":kittycards})
}
})
http.Handle("/", m)
}