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import { hex_id } from "./helper.ts";
export interface PrefDecl<T> {
name: string,
default: T,
type?: Type,
description: string,
possible_values?: T[]
optional?: boolean,
}
type Type = "string" | "number" | "bigint" | "boolean" | "symbol" | "undefined" | "object" | "function";
type PrefMap<T extends { [key: string]: { default: unknown } }> = { [Key in keyof T]: T[Key]["default"] }
export function register_prefs<T extends Record<string, PrefDecl<unknown>>>(ds: T): PrefMap<T> {
const p: PrefMap<T> = {} as PrefMap<T>
for (const key in ds) {
const d = ds[key];
let type = typeof d.default;
if (type == "undefined") { if (d.type) type = d.type; else throw new Error("type needed"); }
let value = get_param(type, d.name) ?? d.default;
if (d.possible_values) if (!d.possible_values.includes(value)) value = d.default
p[key] = value
}
return p
}
const raw_params = load_params().p;
export function load_params(): { p: { [key: string]: string }, rname: string } {
const q: Record<string, string> = {}
const [rname, params] = window.location.hash.substring(1).split("?")
if (!params) return { rname, p: {} }
for (const kv of params.split("&")) {
const [key, value] = kv.split("=")
if (key == "prototype") continue
q[decodeURIComponent(key)] = decodeURIComponent(value)
}
return { p: q, rname }
}
export function get_param<T>(ty: string, key: string): T | undefined {
const v = raw_params[key]
if (v == undefined) return undefined
if (ty == "string") return v as unknown as T
else if (ty == "number") {
const n = parseInt(v)
if (!Number.isNaN(n)) return n as unknown as T
console.warn("invalid number parameter");
} else if (ty == "boolean") {
if (v == "0" || v == "false" || v == "no") return false as unknown as T
if (v == "1" || v == "true" || v == "yes") return true as unknown as T
console.warn("invalid boolean parameter");
} else {
throw new Error("invalid param type");
}
return undefined
}
const PREF_DECLS = {
rnnoise: { name: "rnnoise", default: true, description: "Use RNNoise for noise suppression" },
native_noise_suppression: { name: "native_noise_suppression", default: false, description: "Suggest the browser to do noise suppression" },
username: { name: "username", default: "guest-" + hex_id(), description: "Username" },
microphone_gain: { name: "microphone_gain", default: 1, description: "Amplify microphone volume" },
microphone_enabled: { name: "microphone_enabled", default: false, description: "Add one microphone track on startup" },
camera_enabled: { name: "camera_enabled", default: false, description: "Add one camera track on startup" },
screencast_enabled: { name: "screencast_enabled", default: false, description: "Add one screencast track on startup" },
camera_facing_mode: { name: "camera_facing_mode", default: undefined as undefined | string, type: "string" as const, possible_values: ["environment", "user", undefined], description: "Prefer user-facing or env-facing camera" },
warn_redirect: { name: "warn_redirect", default: false, description: "Interal option that is set by a server redirect." },
}
export const PREFS = register_prefs(PREF_DECLS)
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