/**
 * Guard: no native `confirm` or `alert` in the app, and every confirmation awaited (#421).
 *
 * On desktop, tauri-plugin-dialog replaces `window.confirm` with an async function and
 * `window.alert` with one that does not block. `if (!confirm(...)) return;` then tests a
 * Promise, always truthy, and the deletion ran before the user answered. TypeScript does not
 * see it: the DOM type of `confirm` stays `boolean`, and `!promise` is not an error.
 *
 * It reads the non-test sources of `src/`, comments removed, as `i18n-mock-guard.test.ts` does,
 * and fails on:
 *   1. a native `confirm` or `alert`: called bare or through `window`, `globalThis` or `self`
 *      (a member call such as `deps.confirm(` is not the native one), with `?.(` too, read by
 *      index (`window["confirm"]`) or destructured from one of those objects;
 *   2. a call to `confirmAction(` or to an injected `confirm(` (`deps.confirm(`,
 *      `ui.confirm(`) that is not directly preceded by `await`;
 *   3. any other mention of `confirmAction`: an alias (`const c = confirmAction`) or a renamed
 *      import would call it out of reach of rule 2 (#465 review). Allowed besides the awaited
 *      call: its declaration, a plain named import, and `confirm: confirmAction`, the value of
 *      an injected `confirm` whose calls rule 2 checks.
 * `confirmAction` itself calls the plugin's `ask`, so `src/services/confirmService.ts` is
 * scanned like any other file. Keywords rather than a parse: the samples below check that each
 * rule flags what it targets and lets the right form through.
 */

import { describe, it, expect } from "vitest";
import { readdirSync, readFileSync } from "fs";
import { relative, resolve, sep } from "path";

const SRC = resolve(import.meta.dirname, "..");

const NATIVE_CALL = /(?:\b(?:window|globalThis|self)\s*\.\s*|(?<![.\w$]))(?:confirm|alert)\s*(?:\?\.\s*)?\(/;
const NATIVE_INDEX = /\b(?:window|globalThis|self)\s*(?:\?\.\s*)?\[\s*["'`](?:confirm|alert)["'`]\s*\]/;
const NATIVE_DESTRUCTURED = /\{[^}]*\b(?:confirm|alert)\b[^}]*\}\s*=\s*(?:window|globalThis|self)\b/;
// `confirmAction(` or `<receiver>.confirm(`, the receiver captured to skip the native ones.
const CONFIRM_CALL = /\b(?:confirmAction|(\w+)\s*\.\s*confirm)\s*\(/g;
const NATIVE_RECEIVER = /^(?:window|globalThis|self)$/;
const AWAITED = /\bawait\s+$/;
const DECLARED = /\bfunction\s+$/;
// Mentions of `confirmAction` that rule 3 allows; any other one is an offence.
const CONFIRM_ACTION = /\bconfirmAction\b/g;
const ALLOWED_MENTION = [
  /\bawait\s+confirmAction\s*\(/g,
  /\bfunction\s+confirmAction\s*\(/g,
  /^\s*import\s*\{\s*confirmAction\s*\}\s*from\s/g,
  /\bconfirm\s*:\s*confirmAction\s*[,}]/g,
];

/** The source without its comments, line breaks kept so that line numbers stay right. */
function withoutComments(source: string): string {
  return source
    .replace(/\/\*[\s\S]*?\*\//g, (comment) => comment.replace(/[^\n]/g, ""))
    .replace(/(^|[^:])\/\/.*$/gm, "$1");
}

/** The offences of one line: a native call, or a confirmation not awaited. */
function lineOffences(line: string): string[] {
  const found: string[] = [];
  if (NATIVE_CALL.test(line) || NATIVE_INDEX.test(line) || NATIVE_DESTRUCTURED.test(line)) {
    found.push("native confirm/alert");
  }
  for (const match of line.matchAll(CONFIRM_CALL)) {
    if (match[1] !== undefined && NATIVE_RECEIVER.test(match[1])) continue;
    const before = line.slice(0, match.index);
    if (!AWAITED.test(before) && !DECLARED.test(before)) found.push("confirmation not awaited");
  }
  const allowed = ALLOWED_MENTION.reduce((n, rule) => n + [...line.matchAll(rule)].length, 0);
  if ([...line.matchAll(CONFIRM_ACTION)].length > allowed) found.push("confirmAction out of reach");
  return found;
}

/** The offending lines of one source, as `path:line: kind: text`. */
function offences(path: string, source: string): string[] {
  const name = relative(SRC, path).split(sep).join("/");
  return withoutComments(source)
    .split("\n")
    .flatMap((line, i) => lineOffences(line).map((kind) => `${name}:${i + 1}: ${kind}: ${line.trim()}`));
}

const SOURCE_FILES = (readdirSync(SRC, { recursive: true }) as string[])
  .filter((entry) => /\.tsx?$/.test(entry) && !/\.test\.tsx?$/.test(entry) && !entry.endsWith(".d.ts"))
  .map((entry) => resolve(SRC, entry));

describe("native dialog guard (#421)", () => {
  it("scans the app's sources", () => {
    const names = SOURCE_FILES.map((path) => relative(SRC, path).split(sep).join("/"));
    expect(names.length).toBeGreaterThan(200);
    expect(names).toContain("components/profile/ProfileFormModal.tsx");
    expect(names).toContain("hooks/useLicenseMachines.ts");
    expect(names).toContain("services/confirmService.ts");
  });

  it.each([
    "if (!confirm(t(\"profile.deleteConfirm\"))) return;",
    "if (confirm(message)) {",
    "if (!window.confirm(message)) return;",
    "onClick={() => removeKey({ confirm: (m) => window.confirm(m), t })}",
    "globalThis.confirm(message);",
    "self . alert(message);",
    "alert(message);",
    "if (!window[\"confirm\"](message)) return;",
    "globalThis['alert'](message);",
    "if (!confirm?.(message)) return;",
    "const { confirm } = window;",
    "const { alert: show, confirm: ask } = globalThis;",
  ])("flags the native call in %s", (line) => {
    expect(lineOffences(line)).toContain("native confirm/alert");
  });

  it.each([
    "if (!confirmAction(t(\"categories.deleteConfirm\"))) return;",
    "if (confirmAction(message)) {",
    "if (!deps.confirm(deps.t(key))) return;",
    "const ok = ui.confirm(message);",
  ])("flags the confirmation not awaited in %s", (line) => {
    expect(lineOffences(line)).toContain("confirmation not awaited");
  });

  it.each([
    "const c = confirmAction;",
    "import { confirmAction as ask } from \"../services/confirmService\";",
    "const handlers = { remove: confirmAction };",
    "items.map(confirmAction);",
    "if (await confirmAction(a) && check(confirmAction)) {",
  ])("flags confirmAction out of reach in %s", (line) => {
    expect(lineOffences(line)).toContain("confirmAction out of reach");
  });

  it.each([
    "if (!(await confirmAction(t(\"profile.deleteConfirm\")))) return;",
    "if (await confirmAction(message)) {",
    "if (!(await deps.confirm(deps.t(key)))) return;",
    "const ok = await confirmAction(message);",
    "onClick={() => void removeKey({ confirm: confirmAction, t })}",
    "import { confirmAction } from \"../../services/confirmService\";",
    "export async function confirmAction(message: string): Promise<boolean> {",
    "if ((await confirmAction(a)) && (await confirmAction(b))) {",
    "deps.confirm.mockClear();",
    "const confirmed = await ask(message, { kind: \"warning\" });",
    "t(\"common.confirm\")",
  ])("lets %s through", (line) => {
    expect(lineOffences(line)).toEqual([]);
  });

  it("finds no native dialog and no confirmation left unawaited", () => {
    const found = SOURCE_FILES.flatMap((path) => offences(path, readFileSync(path, "utf8")));
    expect(found).toEqual([]);
  });
});