From 429dc2d5375abf8ca9c3861bdc4bdff52a31b0e4 Mon Sep 17 00:00:00 2001
From: metamuffin <metamuffin@disroot.org>
Date: Sat, 10 Sep 2022 00:56:25 +0200
Subject: overlay rework + settings

---
 client-web/source/preferences/mod.ts | 87 ++++++++++++++++++++++++++++++++++++
 1 file changed, 87 insertions(+)
 create mode 100644 client-web/source/preferences/mod.ts

(limited to 'client-web/source/preferences/mod.ts')

diff --git a/client-web/source/preferences/mod.ts b/client-web/source/preferences/mod.ts
new file mode 100644
index 0000000..5b33924
--- /dev/null
+++ b/client-web/source/preferences/mod.ts
@@ -0,0 +1,87 @@
+import { PREF_DECLS } from "./decl.ts";
+
+
+export interface PrefDecl<T> {
+    default?: T,
+    type: T,
+    description?: string,
+    possible_values?: T[]
+    optional?: boolean,
+}
+
+type Type = "string" | "number" | "bigint" | "boolean" | "symbol" | "undefined" | "object" | "function";
+type TypeMapper = { "string": string, "number": number, "boolean": boolean }
+
+type PrefMap<T extends { [key: string]: { type: unknown } }> = { [Key in keyof T]: T[Key]["type"] }
+type Optional<T extends { [key: string]: unknown }> = { [Key in keyof T]?: T[Key] }
+export const { prefs: PREFS, explicit: PREFS_EXPLICIT } = register_prefs(PREF_DECLS)
+export const on_pref_change_handlers: ((key: keyof typeof PREFS) => void)[] = []
+
+export function register_prefs<T extends Record<string, PrefDecl<unknown>>>(ds: T): { prefs: PrefMap<T>, explicit: Optional<PrefMap<T>> } {
+    const prefs: PrefMap<T> = {} as PrefMap<T>
+    const explicit: Optional<PrefMap<T>> = {}
+    for (const key in ds) {
+        const d = ds[key];
+        const type = typeof d.type;
+        let value = get_param(type, key)
+        if (value !== undefined) explicit[key] = value
+        value ??= d.default;
+        if (d.possible_values) if (!d.possible_values.includes(value)) value = d.default
+        prefs[key] = value
+    }
+    return { prefs, explicit }
+}
+
+export function change_pref<T extends keyof typeof PREFS>(key: T, value: typeof PREFS[T]) {
+    PREFS[key] = value
+    if ((PREF_DECLS as Record<string, PrefDecl<unknown>>)[key].default != value)
+        PREFS_EXPLICIT[key] = value
+    else delete PREFS_EXPLICIT[key]
+    window.location.hash = "#" + generate_section()
+}
+export function generate_section(): string {
+    const section = []
+    for (const key in PREFS_EXPLICIT) {
+        section.push(encodeURIComponent(key) + "=" + encodeURIComponent(param_to_string(
+            PREFS_EXPLICIT[key as unknown as keyof typeof PREFS_EXPLICIT]
+        )))
+    }
+    return load_params().rname + "?" + section.join("&")
+}
+
+export function load_params(): { raw_params: { [key: string]: string }, rname: string } {
+    const raw_params: Record<string, string> = {}
+    const [rname, param_str] = window.location.hash.substring(1).split("?")
+    if (!param_str) return { rname, raw_params: {} }
+    for (const kv of param_str.split("&")) {
+        const [key, value] = kv.split("=")
+        if (key == "prototype") continue
+        raw_params[decodeURIComponent(key)] = decodeURIComponent(value)
+    }
+    return { raw_params, rname }
+}
+
+function param_to_string<T>(p: T): string {
+    if (typeof p == "string") return p
+    else if (typeof p == "boolean") return JSON.stringify(p)
+    else if (typeof p == "number") return JSON.stringify(p)
+    throw new Error("impossible");
+}
+
+function get_param<T>(ty: string, key: string): T | undefined {
+    const v = load_params().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
+}
-- 
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