/**
 * Which failures a user can act on, which just need reporting, and whether
 * the setup diagnosis names the right step.
 */
import { test } from "node:test";
import assert from "node:assert/strict";
import {
  CONTACT,
  ImpossibleRequest,
  NO_CARD,
  NO_GREETING,
  SuckerError,
  TOO_FEW_MESSAGES,
  diagnoseSetup,
  isImpossibleRequest,
  isSuckerError,
  userFacingMessage,
} from "../src/lib/errors.ts";

const CARD = "<Gaius's Persona>a tired innkeeper</Gaius's Persona>";
const ok = (prompt: string, persona: string) => `${prompt}\n${CARD}\n${persona}`;

test("a correctly set up card has nothing to diagnose", () => {
  assert.equal(diagnoseSetup(ok("<.>", "<UserPersona>.</UserPersona>")), null);
});

test("a missing custom prompt is named with certainty, not blamed on truncation", () => {
  const msg = diagnoseSetup(ok("", "<UserPersona>.</UserPersona>"))!.message;
  assert.match(msg, /custom prompt is not coming through as <\.>/);
  assert.ok(!/cut it short|Context Size/.test(msg), "truncation cannot remove the first three characters");
  assert.ok(!/persona/i.test(msg), "the persona is fine and must not be mentioned");
});

test("a wrong persona description is quoted back, so there is nothing to guess", () => {
  const msg = diagnoseSetup(ok("<.>", "<UserPersona>I am a knight</UserPersona>"))!.message;
  assert.match(msg, /persona description is "I am a knight"/);
  assert.match(msg, /just a dot/);
  assert.ok(!/Context Size/.test(msg), "this case is certain; truncation is not the story");
});

test("an empty persona description says so", () => {
  assert.match(diagnoseSetup(ok("<.>", "<UserPersona></UserPersona>"))!.message, /description is empty/);
});

test("a long persona description is trimmed to one readable line", () => {
  const long = "x".repeat(80) + "\n\n  y";
  const msg = diagnoseSetup(ok("<.>", `<UserPersona>${long}</UserPersona>`))!.message;
  assert.match(msg, /"x{40}…"/);
  assert.ok(!msg.includes("\n"), "no raw newlines from user content");
});

test("a persona marker that is gone leads with truncation, the common cause", () => {
  const msg = diagnoseSetup(ok("<.>", ""))!.message;
  assert.match(msg, /end of it is missing/);
  assert.ok(msg.indexOf("Context Size") < msg.indexOf("persona"), "truncation first, persona second");
});

test("a persona marker cut off mid-tag is truncation, not a wrong description", () => {
  const msg = diagnoseSetup(ok("<.>", "<UserPersona>.</UserPe"))!.message;
  assert.match(msg, /Context Size/);
  assert.ok(!/description is/.test(msg));
});

test("both settings wrong at once are both named", () => {
  const msg = diagnoseSetup(ok("", "<UserPersona>knight</UserPersona>"))!.message;
  assert.match(msg, /custom prompt is not coming through/);
  assert.match(msg, /description is "knight" as well/);
  const neither = diagnoseSetup(ok("", ""))!.message;
  assert.match(neither, /custom prompt is not coming through/);
  assert.match(neither, /persona did not come through either/);
});

test("every setup message is shown verbatim and says where to go when stuck", () => {
  for (const card of [ok("", "<UserPersona>.</UserPersona>"), ok("<.>", "<UserPersona>x</UserPersona>"), ok("<.>", ""), ok("", "")]) {
    const e = diagnoseSetup(card)!;
    assert.ok(isSuckerError(e));
    assert.equal(userFacingMessage(e), e.message);
    assert.ok(e.message.includes(CONTACT));
  }
});

test("shapes Janitor cannot produce never tell the user to fix them", () => {
  for (const e of [NO_CARD, NO_GREETING, TOO_FEW_MESSAGES]) {
    const msg = userFacingMessage(e);
    assert.match(msg, /not your fault and there is nothing for you to fix/i);
    assert.ok(msg.includes(CONTACT), "must say where to report it");
    assert.ok(!/open the chat|try again|point sucker|nothing was saved/i.test(msg), `overclaim or advice leaked into: ${msg}`);
  }
});

test("the report carries which assumption broke, so it is useful", () => {
  assert.match(userFacingMessage(NO_GREETING), /\(no greeting in the request\)/);
  assert.match(userFacingMessage(NO_CARD), /\(no system message in the request\)/);
  assert.match(userFacingMessage(TOO_FEW_MESSAGES), /\(fewer than two messages/);
});

test("a genuine bug reports itself without leaking internals", () => {
  const msg = userFacingMessage(new TypeError("Cannot read properties of undefined"));
  assert.match(msg, /not your fault/i);
  assert.ok(msg.includes(CONTACT));
  assert.ok(!msg.includes("Cannot read properties"));
  assert.ok(!/\($/.test(msg.trim()), "no empty detail parenthesis");
});

test("nobody is called a dingus", () => {
  for (const e of [diagnoseSetup("nothing")!, NO_CARD, NO_GREETING, TOO_FEW_MESSAGES, new Error("x")]) {
    assert.ok(!/dingus/i.test(userFacingMessage(e)));
  }
});

test("classified across module boundaries, not just by identity", () => {
  assert.ok(isSuckerError(new SuckerError("x")));
  assert.ok(isSuckerError({ name: "SuckerError", message: "x" }));
  assert.ok(isImpossibleRequest(new ImpossibleRequest("x")));
  assert.ok(isImpossibleRequest({ name: "ImpossibleRequest", detail: "x" }));
  assert.ok(!isSuckerError(new Error("x")));
  assert.ok(!isImpossibleRequest(new SuckerError("x")));
  assert.ok(!isSuckerError(null));
});