const express = require('express')
const application = express()
application.use(require('compression')())
application.use(express.static('public'))
const host = process.env.HOST || '0.0.0.0'
const port = process.env.PORT || 3000
const server = application.listen(port, host, () => console.log(`小猫钓鱼游戏服务运行在 http://${host}:${port}/`))
const io = require('socket.io')(server)

const clients = [] // 所有客户
const players = [] // 所有玩家
let current = -1 // 当前玩家序号
let cards = [] // 桌上的牌

io.on('connection', (client) => {
    // 初始化客户端
    client.cards = []
    clients.push(client)
    console.info(`新连接，当前客户端${clients.length}个`)
    // 广播新的客户端数量
    io.emit('online', clients.length)
    // 通知客户当前游戏状态
    update_status(client)
    client.emit('join', 0)
    client.emit('players', players.length)
    // 其它客户事件处理
    client.on('disconnect', () => disconnect(client))
    client.on('join', () => join(client))
    client.on('go', () => go(client))
})

function disconnect(client) {
    // 移除客户端
    let index = clients.indexOf(client)
    clients.splice(index, 1)
    io.emit('online', clients.length)
    console.log(`已断开，当前客户端${clients.length}个`)
    // 移除玩家
    if (players.includes(client)) {
        index = players.indexOf(client)
        players.splice(index, 1)
        io.emit('players', players.length)
        // 游戏被迫结束
        if (players.length == 2) {
            io.emit('alert', `玩家${index + 1}掉线了，游戏被迫结束!`)
            finish()
        }
    }
}

function join(player) {
    if (players.length < 3) {
        let player_index = players.indexOf(player)
        let player_number = player_index + 1
        if (player_number > 0) {
            players.splice(player_index, 1)
            player.broadcast.emit('alert', `玩家${player_number}退出了游戏`)
            console.log(`玩家${player_number}退出了，当前玩家${players.length}个`)
            player.emit('alert', '你退出了游戏')
            player.emit('join', 0)
            player_number = 0
            for (let i = 0; i < players.length; i++) {
                players[i].emit('join', i + 1)
                players[i].emit('alert', `你现在是玩家${i + 1}`)
            }
        } else {
            player.cards = []
            players.push(player)
            player_number = players.indexOf(player) + 1
            player.emit('join', player_number)
            player.emit('alert', `你现在是玩家${player_number}`)
            player.broadcast.emit('alert', `玩家${player_number}加入了游戏`)
            console.log(`玩家${player_number}加入了，当前玩家${players.length}个`)
            if (players.length === 3) start()
        }
        io.emit('players', players.length)
    }
}

function start() {
    console.log('新游戏开始')
    io.emit('alert', '游戏开始了！')
    // 初始化游戏状态
    current = 0
    cards = []
    players[0].cards = []
    players[1].cards = []
    players[2].cards = []
    // 三个玩家每人发18张牌
    let deck = [
        '2s',
        '3s',
        '4s',
        '5s',
        '6s',
        '7s',
        '8s',
        '9s',
        'Ts',
        'Js',
        'Qs',
        'Ks',
        'As',
        '2h',
        '3h',
        '4h',
        '5h',
        '6h',
        '7h',
        '8h',
        '9h',
        'Th',
        'Jh',
        'Qh',
        'Kh',
        'Ah',
        '2c',
        '3c',
        '4c',
        '5c',
        '6c',
        '7c',
        '8c',
        '9c',
        'Tc',
        'Jc',
        'Qc',
        'Kc',
        'Ac',
        '2d',
        '3d',
        '4d',
        '5d',
        '6d',
        '7d',
        '8d',
        '9d',
        'Td',
        'Jd',
        'Qd',
        'Kd',
        'Ad',
        '01',
        '02',
    ]
    while (deck.length > 0) {
        let index = Math.floor(Math.random() * deck.length)
        let card = deck[index]
        deck.splice(index, 1)
        players[current].cards.push(card)
        current = (current + 1) % 3
    }
    update_status()
}

function update_status(client = null) {
    ;(client || io).emit('status', {
        players: players.length == 3 ? [players[0].cards.length, players[1].cards.length, players[2].cards.length] : [0, 0, 0],
        cards,
        current: current + 1,
    })
}

function go(player) {
    if (current != -1 && players.indexOf(player) == current) {
        let card = players[current].cards[0]
        players[current].cards.splice(0, 1)
        console.log(`玩家${current + 1} 出牌 [${card}]`)

        // 判断有没有钓到
        let i = 0
        let getit = false
        for (i = 0; i < cards.length; i++) {
            if (cards[i][0] == card[0]) {
                getit = true
                break
            }
        }
        if (getit) {
            // 将第i张牌后面的牌和玩家刚出的牌一起拿走放回玩家手中的牌后面
            const fishes = [...cards.slice(i), card]
            console.log(`玩家${current + 1} 钓到了 ${fishes.length} 条鱼`)
            io.emit('alert', `玩家${current + 1} 钓到了 ${fishes.length} 条鱼`)
            players[current].cards = players[current].cards.concat(fishes)
            cards = cards.slice(0, i)
        } else {
            cards.push(card)
            if (players[current].cards.length == 0) {
                player.emit('alert', '你输了')
                player.broadcast.emit('alert', `玩家${current + 1}输了`)
            }
            current = (current + 1) % 3
            while (players[current].cards.length == 0) {
                current = (current + 1) % 3
            }
        }

        // 游戏结束了？
        let looser = 0
        let winner = 0
        for (let index = 0; index < players.length; index++) {
            if (players[index].cards.length == 0) looser++
            else winner = index + 1
        }

        if (looser >= 2) {
            io.emit('alert', '游戏结束了~~~')
            players[winner - 1].emit('alert', '恭喜，你赢了！')
            players[winner - 1].broadcast.emit('alert', `你失败了，玩家${winner}获胜了！`)
            finish()
        }

        update_status()
    }
}

function finish() {
    current = -1
    cards.length = 0
    players.length = 0
    update_status()
    io.emit('join', 0)
    io.emit('players', 0)
}