pico.chat/apps/hanabi.js

const initCards = () => {
    const cards = new Map()
    for(const color of ['red', 'green', 'blue', 'yellow', 'white']) {
        for(const value of [1, 1, 1, 2, 2, 3, 3, 4, 4, 5]) {
            const id = cards.size
            const pos = Hanabi.nrows * Hanabi.ncols - 1
            const ts = Math.random()
            cards.set(id, {id, pos, color, value, ts, faceUp: false})
        }
    }
    return cards
}

const clip = (v, vmin, vmax) => {
    return Math.min(Math.max(v, vmin), vmax)
}

const clipToElement = ([x, y], selector) => {
    const boundingArea = document.querySelector(selector)
    const {offsetLeft, offsetTop, offsetWidth, offsetHeight} = boundingArea
    x = clip(x, offsetLeft, offsetLeft + offsetWidth)
    y = clip(y, offsetTop, offsetTop + offsetHeight)
    return [x, y]
}

const findNearestDropzoneBFS = (cx, cy) => {
    try {
        const dropzone = ['stack', 'card']
        const [x, y] = clipToElement([cx, cy], '.stacks')
        const deque = [JSON.stringify([x, y])]
        const seen = new Set(deque)
        while(deque.length && deque.length < 50) {
            const coord = deque.shift()
            const [x, y] = JSON.parse(coord)
            for(const dx of [-1, 0, 1]) {
                for(const dy of [-1, 0, 1]) {
                    const [nx, ny] = [x + dx, y + dy]
                    const ncoord = JSON.stringify([nx, ny])
                    if(!seen.has(ncoord)) {
                        deque.push(ncoord)
                        seen.add(ncoord)
                    }
                }
            }
            target = document.elementFromPoint(x - scrollX, y - scrollY)
            isValid = target && dropzone.filter(s => target.classList.contains(s)).length
            if(isValid) {
                return target
            }
        }
        throw 'dropzone not found'
    }
    catch(error) {
        Chat.log(error)
        const stacks = [...document.querySelectorAll('.stack')]
        return stacks[Hanabi.nrows * Hanabi.ncols - 1]
    }
}

const Counter = {
    step: (name, delta) => () => {
        Hanabi.counters[name] += delta
        Hanabi.sync()
    },
    view: ({attrs}) => m('.counter',
        m('span', attrs.name),
        m('button', {onclick: Counter.step(attrs.name, -1)}, '-'),
        m('span', Hanabi.counters[attrs.name]),
        m('button', {onclick: Counter.step(attrs.name, +1)}, '+'),
    ),
}

const Hanabi = {
    nrows: 8,
    ncols: 7,
    counters: {clues: 8, bombs: 3},
    players: new Map(),
    cards: [],
    oninit: () => {
        Hanabi.cards = initCards()
        listen('hanabi', ({detail}) => {
            Hanabi.counters = detail.value.counters
            Hanabi.cards = new Map(detail.value.cards)
        })
        listen('join', () => setTimeout(Hanabi.sync, 100))
        doNotLog.add('hanabi')
    },
    sync: () => {
        wire({kind: 'hanabi', value: {
            counters: Hanabi.counters,
            cards: [...Hanabi.cards.entries()],
        }})
    },
    getStacks: () => {
        const totalCount = Hanabi.nrows * Hanabi.ncols
        const stacks = new Array(totalCount).fill(null).map(_ => [])
        Hanabi.cards.forEach((card) => stacks[card.pos].push(card))
        return stacks
    },
    renderCard: (card, i) => {
        const attrs = {
            id: card.id,
            value: card.value,
            style: {top: `${-3 * i}px`},
            ondragstart: (ev) => {
                ev.dataTransfer.setData('idx', card.id)
                ev.dataTransfer.dropEffect = 'move'
            },
            ondragend: (ev) => {
                for(const el of document.querySelectorAll('.drag-target')) {
                    el.classList.remove('drag-target')
                }
            },
            class: ['card', card.color, card.faceUp && 'face-up'].join(' '),
            draggable: true,
        }
        return m('div', attrs)
    },
    renderStack: (pos, stacks) => {
        const stack = stacks[pos]
        stack.sort((a, b) => a.ts - b.ts)
        const attrs = {
            pos: pos,
            ondrop: (ev) => {
                ev.preventDefault()
                const card = Hanabi.cards.get(+ev.dataTransfer.getData('idx'))
                card.pos = pos
                card.ts = +new Date()
                Hanabi.sync()
            },
            ondragenter: (ev) => {
                /* needed for drag-drop shim */
                ev.preventDefault()
                for(const el of document.querySelectorAll('.drag-target')) {
                    el.classList.remove('drag-target')
                }
                ev.target.classList.add('drag-target')
            },
            ondragover: (ev) => {
                ev.preventDefault()
                ev.dataTransfer.dropEffect = 'move'
            },
        }
        const doMany = (fn) => {
            return {onclick: () => {stack.forEach(fn); Hanabi.sync()}}
        }
        const actions = [
            m('button', doMany(card => card.faceUp = !card.faceUp), 'flip'),
            m('button', doMany(card => card.ts = card.id), 'sort'),
            m('button', doMany(card => card.ts = Math.random()), 'shuffle'),
            m('button', doMany(card => card.faceUp = true), 'reveal'),
        ]
        return m('.stack', attrs, stack.map(Hanabi.renderCard),
            stack.length ? m('.actions', actions) : null,
        )
    },
    renderStacks: () => {
        const stacks = Hanabi.getStacks()
        return m('.stacks', {style: {'--ncols': Hanabi.ncols}},
            Array(Hanabi.nrows).fill(null).map((_, y) =>
            Array(Hanabi.ncols).fill(null).map((_, x) =>
                m('.col',
                    {owner: State.online[y], class: y < 5 ? State.username === State.online[y] ? 'own' : 'rival' : ''},
                    Hanabi.renderStack(y * Hanabi.ncols + x, stacks)),
                )
            )
        )
    },
    view: () => m('.hanabi',
        Hanabi.renderStacks(),
        m(Counter, {name: 'clues'}),
        m(Counter, {name: 'bombs'}),
    ),
}

// requires mobile-drag-drop.js
MobileDragDrop.polyfill({
    elementFromPoint: findNearestDropzoneBFS,
})
addEventListener('touchmove', () => {})