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/**
* @typedef {Record<string, { $$count: number; $$props?: Listeners }>} Listeners
*/
/**
* @callback UnsubscribeFunction
*/
import { batchHandler } from './batch.js'
import { kStaty, isValidForStaty } from './constants.js'
import { RefStaty } from './types/ref.js'
import { createProxy } from './proxy.js'
function _subscribe (state, handler, prop, opts = {}) {
const { filter = null, before = false } = opts
handler = { run: handler, filter, before }
const subscriptions = state[kStaty].subscriptions
if (prop) {
if (!subscriptions.props.has(prop)) {
subscriptions.props.set(prop, new Set())
}
subscriptions.props.get(prop).add(handler)
} else {
subscriptions.default.add(handler)
}
return () => {
if (prop) {
subscriptions.props.get(prop).delete(handler)
} else {
subscriptions.default.delete(handler)
}
}
}
const defaultOnReadOnly = (target, prop, value) => {
console.warn('snapshots are readonly', { target, prop, value })
}
const CACHE = new WeakMap()
/**
* Creates a new proxy-state
*
* @template {object} T
* @param {T} target
* @param {object} [opts]
* @param {(target: T, prop: unknown, value: unknown) => {}} [opts.onReadOnly]
* @param {(state: T) => {}} [opts.onAction]
* @returns {T}
*/
export function staty (target, opts = {}) {
const {
onReadOnly = defaultOnReadOnly,
onAction
} = opts
if (target?.[kStaty]) return target
const targetType = Object.prototype.toString.call(target)
if (!isValidForStaty(targetType)) {
throw new Error('the `target` is not valid for staty')
}
if (CACHE.has(/** @type {object} */(target))) {
return CACHE.get(/** @type {object} */(target))
}
const proxyOptions = { onReadOnly }
const state = createProxy(proxyOptions, target, undefined, undefined, targetType)
if (onAction) {
onAction(state)
state[kStaty].setOnAction(onAction)
}
CACHE.set(/** @type {object} */(target), state)
return state
}
/**
* Get subscription listeners count
*
* @template {object} T
* @param {T} state
* @returns {{ $$count: number, $$props: Listeners }}
*/
export function listeners (state) {
if (!state || !state[kStaty] || state[kStaty].isRef) throw new Error('state is not valid')
const internal = state[kStaty]
const subscriptions = internal.subscriptions
/** @type {Listeners} */
const props = {}
let count = subscriptions.default.size
subscriptions.props.forEach((listeners, prop) => {
props[prop] = { $$count: listeners.size }
count += listeners.size
})
internal.forEach((val, prop) => {
if (val?.[kStaty] && !val[kStaty].isRef) {
const res = listeners(val)
count += res.$$count
if (props[prop]) {
props[prop].$$count += res.$$count
props[prop].$$props = res.$$props
} else {
props[prop] = res
}
}
})
return {
$$count: count,
$$props: props
}
}
/**
* Subscribe for changes in the state
*
* @template {object} T
* @param {T} state
* @param {() => void} handler
* @param {Object} [opts]
* @param {string|string[]} [opts.props] props to subscribe
* @param {(actionName: string) => boolean} [opts.filter] subscribe only for specific action names
* @param {boolean} [opts.batch=false] execute in batch turning the subscription into async
* @param {boolean} [opts.autorun=false] run immediately
* @param {boolean} [opts.before=false] run before finish the action. A good place to validate changes
* @returns {UnsubscribeFunction}
*/
export function subscribe (state, handler, opts = {}) {
if (!state || !state[kStaty] || state[kStaty].isRef) throw new Error('state is not valid')
const {
props,
filter,
batch = false,
autorun = false,
before = false
} = opts
if (batch && before) throw new Error('batch=true with before=true is not possible')
if (autorun && before) throw new Error('autorun=true with before=true is not possible')
const subscribeProps = {
filter,
before
}
if (batch) {
const userHandler = handler
handler = () => batchHandler(userHandler)
}
let dispose
if (!props) {
dispose = _subscribe(state, handler, null, subscribeProps)
if (autorun) handler()
return dispose
}
if (!Array.isArray(props)) {
dispose = _subscribe(state, () => {
return handler()
}, props, subscribeProps)
if (autorun) handler()
return dispose
}
let scheduled = false
const unsubscribes = props.map(prop => {
return _subscribe(state, () => {
if (!batch) return handler()
if (!scheduled) {
scheduled = true
queueMicrotask(() => {
scheduled = false
})
return handler()
}
}, prop, subscribeProps)
})
if (autorun) handler()
return () => unsubscribes.forEach(unsubscribe => unsubscribe())
}
/**
* Add a ref to another object
*
* @template {object} T
* @template {object | T} M
* @param {T} value
* @param {(ref: T) => M} [mapSnapshot]
* @param {boolean} [cache] enable cache
* @returns {T & RefStaty}
*/
export function ref (value, mapSnapshot, cache) {
const internal = new RefStaty(value, mapSnapshot, cache)
const obj = new Proxy(internal, {
get (_, prop) {
if (prop === kStaty) return internal
if (typeof internal.value[prop] === 'function') return (...args) => internal.value[prop](...args)
return internal.value[prop]
},
getOwnPropertyDescriptor (_, prop) {
try {
return Reflect.getOwnPropertyDescriptor(internal.value, prop)
} catch (err) {
return undefined
}
},
ownKeys () {
try {
return Reflect.ownKeys(internal.value)
} catch (err) {
return []
}
}
})
return /** @type {T & RefStaty} */(obj)
}
// /**
// * @param {Proxy<} target
// * @returns {Proxy<target> is target}
// */
// export function release (target) {
// return new Proxy(target, {
// get: () => {
// return null
// }
// })
// }
export { snapshot } from './snapshot.js'
export { action } from './action.js'
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