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

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

IO.on('connection', (client) => {
    addClient(client)
    client.on('disconnect', () => removeClient(client))
    client.on('join', () => playerJoin(client))
    client.on('go', () => go(client))
})

function addClient(client) {
    client.cards = []
    clients.push(client)
    IO.emit('onlineNumber', clients.length)
    client.emit('playersNumber', players.length)
    client.emit('join', 0)
    gameStatus() // TODO：只告诉当前加入的客户端
    console.info(`新客户端已连接，当前客户端${clients.length}个`)
}

function removeClient(client) {
    let index = clients.indexOf(client)
    clients.splice(index, 1)
    IO.emit('onlineNumber', clients.length)
    console.log(`已断开，当前客户端${clients.length}个`)
    if (players.includes(client)) {
        index = players.indexOf(client)
        players.splice(index, 1)
        IO.emit('playersNumber', players.length)
        // 游戏被迫结束？
        if (players.length == 2) {
            gameFinished()
            IO.emit('alert', `玩家${index + 1}掉线了`)
        }
    }
}

function playerJoin(player) {
    if (players.length < 3) {
        let playerIndex = players.indexOf(player)
        let playerNumber = playerIndex + 1
        if (playerNumber > 0) {
            playerNumber = 0
            players.splice(playerIndex, 1)
            console.log(`玩家${playerNumber} 已退出，当前玩家数：${players.length}`)
        } else {
            players.push(player)
            playerNumber = players.indexOf(player) + 1
            console.log(`玩家${playerNumber} 已加入，当前玩家数：${players.length}`)
            player.cards = []
            if (players.length === 3) gameStart()
        }
        player.emit('join', playerNumber)
        IO.emit('playersNumber', players.length)
    }
}

function gameStart() {
    console.log('游戏开始')
    cardsOnTable.length = 0
    currentPlayerNumber = 0
    // 洗牌，每玩家发18张
    const drawer = [
        { color: '♠️', value: '2' },
        { color: '♠️', value: '3' },
        { color: '♠️', value: '4' },
        { color: '♠️', value: '5' },
        { color: '♠️', value: '6' },
        { color: '♠️', value: '7' },
        { color: '♠️', value: '8' },
        { color: '♠️', value: '9' },
        { color: '♠️', value: '10' },
        { color: '♠️', value: 'J' },
        { color: '♠️', value: 'Q' },
        { color: '♠️', value: 'K' },
        { color: '♠️', value: 'A' },
        { color: '♥️', value: '2' },
        { color: '♥️', value: '3' },
        { color: '♥️', value: '4' },
        { color: '♥️', value: '5' },
        { color: '♥️', value: '6' },
        { color: '♥️', value: '7' },
        { color: '♥️', value: '8' },
        { color: '♥️', value: '9' },
        { color: '♥️', value: '10' },
        { color: '♥️', value: 'J' },
        { color: '♥️', value: 'Q' },
        { color: '♥️', value: 'K' },
        { color: '♥️', value: 'A' },
        { color: '♣️', value: '2' },
        { color: '♣️', value: '3' },
        { color: '♣️', value: '4' },
        { color: '♣️', value: '5' },
        { color: '♣️', value: '6' },
        { color: '♣️', value: '7' },
        { color: '♣️', value: '8' },
        { color: '♣️', value: '9' },
        { color: '♣️', value: '10' },
        { color: '♣️', value: 'J' },
        { color: '♣️', value: 'Q' },
        { color: '♣️', value: 'K' },
        { color: '♣️', value: 'A' },
        { color: '♦️', value: '2' },
        { color: '♦️', value: '3' },
        { color: '♦️', value: '4' },
        { color: '♦️', value: '5' },
        { color: '♦️', value: '6' },
        { color: '♦️', value: '7' },
        { color: '♦️', value: '8' },
        { color: '♦️', value: '9' },
        { color: '♦️', value: '10' },
        { color: '♦️', value: 'J' },
        { color: '♦️', value: 'Q' },
        { color: '♦️', value: 'K' },
        { color: '♦️', value: 'A' },
        { color: '小', value: 'Joker' },
        { color: '大', value: 'Joker' },
    ]

    while (drawer.length > 0) {
        let index = Math.floor(Math.random() * drawer.length)
        let card = drawer[index]
        players[currentPlayerNumber].cards.push(card)
        drawer.splice(index, 1)
        currentPlayerNumber = (currentPlayerNumber + 1) % 3
    }

    gameStatus()
}

function gameStatus() {
    const cardsNumbers = []

    for (let player of players) {
        cardsNumbers.push(player.cards.length)
    }

    const cardsStrings = []
    for (let card of cardsOnTable) {
        cardsStrings.push(`[${card.color}${card.value}]`)
    }

    IO.emit('status', {
        players: cardsNumbers,
        cards: cardsStrings.join(''),
        current: currentPlayerNumber,
    })
}

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

        // 判断有没有钓到
        let i = 0
        let getit = false
        for (i = 0; i < cardsOnTable.length; i++) {
            if (cardsOnTable[i].value == card.value) {
                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 = [...cardsOnTable.slice(i), card]
            console.log(`玩家${currentPlayerNumber + 1} 钓到 ${fishes.length} 条鱼`)
            players[currentPlayerNumber].cards = players[currentPlayerNumber].cards.concat(fishes)
            cardsOnTable = cardsOnTable.slice(0, i)
        } else {
            cardsOnTable.push(card)
            if (players[currentPlayerNumber].cards.length == 0) {
                client.emit('alert', '你输了')
            }
            currentPlayerNumber = (currentPlayerNumber + 1) % 3
            while (players[currentPlayerNumber].cards.length == 0) {
                currentPlayerNumber = (currentPlayerNumber + 1) % 3
            }
        }

        gameStatus()

        // 游戏结束了？
        let looser = 0
        let winner = 0
        for (let index = 0; index < players.length; index++) {
            const player = players[index]
            if (player.cards.length == 0) looser++
            else winner = index + 1
        }
        if (looser >= 2) {
            gameFinished()
            players[index].emit('alert', '你赢了！')
            players[index].broadcast.emit('alert', `玩家${winner} 获胜了！`)
        }
    }
}

function gameFinished() {
    players.length = 0
    cardsOnTable.length = 0
    currentPlayerNumber = -1
    IO.emit('join', 0)
    IO.emit('playersNumber', 0)
    IO.emit('status', { players: [0, 0, 0], cards: '', current: currentPlayerNumber })
}