import {JSCallback, CString} from 'bun:ffi'
import {encodeCString, default as lib} from './lib'
export class Webview {
	static #instances = []
	static unload() {
		for (const instance of this.#instances)
			instance.destroy()
		lib.close()
	}
	#handle
	#callbacks = {}
	constructor(debug = false, window) {
		this.#handle = lib.symbols.webview_create(Number(this.debug = debug), window)
	}
	get handle() {
		return handle
	}
	get window() {
		return lib.symbols.webview_get_window(this.#handle)
	}
	set title(title) {
		lib.symbols.webview_set_title(this.#handle, encodeCString(title))
	}
	set size({width, height, hint}) {
		lib.symbols.webview_set_size(this.#handle, width, height, hint)
	}
	set html(html) {
		lib.symbols.webview_set_html(this.#handle, encodeCString(html))
	}
	navigate(url) {
		lib.symbols.webview_navigate(this.#handle, encodeCString(url))
	}
	init(source) {
		lib.symbols.webview_init(this.#handle, encodeCString(source))
	}
	eval(source) {
		lib.symbols.webview_eval(this.#handle, encodeCString(source))
	}
	run() {
		lib.symbols.webview_run(this.#handle)
		this.destroy()
	}
	return(id, status, result = null) {
		lib.symbols.webview_return(this.#handle, encodeCString(id), status, encodeCString(result))
	}
	dispatch(name, ...arg) {
		lib.symbols.webview_dispatch(this.#handle, this.#callbacks[name], encodeCString(JSON.stringify(arg)))
	}
	destroy() {
		for (const callback of Object.keys(this.#callbacks))
			this.unbind(callback)
		lib.symbols.webview_terminate(this.#handle)
		lib.symbols.webview_destroy(this.#handle)
		this.#handle = null
	}
	bindRaw(name, callback, arg) {        
		lib.symbols.webview_bind(this.#handle, encodeCString(name), (
			this.#callbacks[name] = new JSCallback((id, req, arg) => callback(new CString(id), new CString(req), arg), {
				args: ['cstring', 'cstring', 'ptr']
			})
		).ptr, arg)
	}
	bind(name, callback) {
		this.bindRaw(name, (id, req) => {
            try {
				const result = callback(...JSON.parse(req))
				if (result instanceof Promise)
					result.then(r => this.return(id, 0, JSON.stringify(r)))
				else
					this.return(id, 0, JSON.stringify(result))
			} catch(error) {
				this.return(id, 1, error)
			}
		})
	}
	unbind(name) {
		lib.symbols.webview_unbind(this.#handle, encodeCString(name))
		this.#callbacks[name]?.close()
		delete this.#callbacks[name]
	}
}