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import Variable from "./variable.js"
import { execAsync } from "./process.js"
import Binding, { Connectable, kebabify, snakeify, Subscribable } from "./binding.js"
export const noImplicitDestroy = Symbol("no no implicit destroy")
export const setChildren = Symbol("children setter method")
export function mergeBindings(array: any[]) {
function getValues(...args: any[]) {
let i = 0
return array.map(value => value instanceof Binding
? args[i++]
: value,
)
}
const bindings = array.filter(i => i instanceof Binding)
if (bindings.length === 0)
return array
if (bindings.length === 1)
return bindings[0].as(getValues)
return Variable.derive(bindings, getValues)()
}
export function setProp(obj: any, prop: string, value: any) {
try {
const setter = `set_${snakeify(prop)}`
if (typeof obj[setter] === "function")
return obj[setter](value)
return (obj[prop] = value)
} catch (error) {
console.error(`could not set property "${prop}" on ${obj}:`, error)
}
}
export type BindableProps<T> = {
[K in keyof T]: Binding<T[K]> | T[K];
}
export function hook<Widget extends Connectable>(
widget: Widget,
object: Connectable | Subscribable,
signalOrCallback: string | ((self: Widget, ...args: any[]) => void),
callback?: (self: Widget, ...args: any[]) => void,
) {
if (typeof object.connect === "function" && callback) {
const id = object.connect(signalOrCallback, (_: any, ...args: unknown[]) => {
return callback(widget, ...args)
})
widget.connect("destroy", () => {
(object.disconnect as Connectable["disconnect"])(id)
})
} else if (typeof object.subscribe === "function" && typeof signalOrCallback === "function") {
const unsub = object.subscribe((...args: unknown[]) => {
signalOrCallback(widget, ...args)
})
widget.connect("destroy", unsub)
}
}
export function construct<Widget extends Connectable & { [setChildren]: (children: any[]) => void }>(widget: Widget, config: any) {
// eslint-disable-next-line prefer-const
let { setup, child, children = [], ...props } = config
if (children instanceof Binding) {
children = [children]
}
if (child) {
children.unshift(child)
}
// remove undefined values
for (const [key, value] of Object.entries(props)) {
if (value === undefined) {
delete props[key]
}
}
// collect bindings
const bindings: Array<[string, Binding<any>]> = Object
.keys(props)
.reduce((acc: any, prop) => {
if (props[prop] instanceof Binding) {
const binding = props[prop]
delete props[prop]
return [...acc, [prop, binding]]
}
return acc
}, [])
// collect signal handlers
const onHandlers: Array<[string, string | (() => unknown)]> = Object
.keys(props)
.reduce((acc: any, key) => {
if (key.startsWith("on")) {
const sig = kebabify(key).split("-").slice(1).join("-")
const handler = props[key]
delete props[key]
return [...acc, [sig, handler]]
}
return acc
}, [])
// set children
const mergedChildren = mergeBindings(children.flat(Infinity))
if (mergedChildren instanceof Binding) {
widget[setChildren](mergedChildren.get())
widget.connect("destroy", mergedChildren.subscribe((v) => {
widget[setChildren](v)
}))
} else {
if (mergedChildren.length > 0) {
widget[setChildren](mergedChildren)
}
}
// setup signal handlers
for (const [signal, callback] of onHandlers) {
const sig = signal.startsWith("notify")
? signal.replace("-", "::")
: signal
if (typeof callback === "function") {
widget.connect(sig, callback)
} else {
widget.connect(sig, () => execAsync(callback)
.then(print).catch(console.error))
}
}
// setup bindings handlers
for (const [prop, binding] of bindings) {
if (prop === "child" || prop === "children") {
widget.connect("destroy", binding.subscribe((v: any) => {
widget[setChildren](v)
}))
}
widget.connect("destroy", binding.subscribe((v: any) => {
setProp(widget, prop, v)
}))
setProp(widget, prop, binding.get())
}
// filter undefined values
for (const [key, value] of Object.entries(props)) {
if (value === undefined) {
delete props[key]
}
}
Object.assign(widget, props)
setup?.(widget)
return widget
}
function isArrowFunction(func: any): func is (args: any) => any {
return !Object.hasOwn(func, "prototype")
}
export function jsx(
ctors: Record<string, { new(props: any): any } | ((props: any) => any)>,
ctor: string | ((props: any) => any) | { new(props: any): any },
{ children, ...props }: any,
) {
children ??= []
if (!Array.isArray(children))
children = [children]
children = children.filter(Boolean)
if (children.length === 1)
props.child = children[0]
else if (children.length > 1)
props.children = children
if (typeof ctor === "string") {
if (isArrowFunction(ctors[ctor]))
return ctors[ctor](props)
return new ctors[ctor](props)
}
if (isArrowFunction(ctor))
return ctor(props)
return new ctor(props)
}
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