import test from "node:test";
import assert from "node:assert/strict";

import { DEFAULT_SETTINGS } from "../lib/defaults.js";
import { mergeSettings } from "../lib/settings.js";

test("empty object yields the defaults", () => {
  assert.deepEqual(mergeSettings({}), DEFAULT_SETTINGS);
});

test("null and undefined yield the defaults", () => {
  assert.deepEqual(mergeSettings(null), DEFAULT_SETTINGS);
  assert.deepEqual(mergeSettings(undefined), DEFAULT_SETTINGS);
});

test("a non-object yields the defaults", () => {
  assert.deepEqual(mergeSettings("nonsense"), DEFAULT_SETTINGS);
  assert.deepEqual(mergeSettings(42), DEFAULT_SETTINGS);
});

test("valid stored values are preserved", () => {
  assert.deepEqual(
    mergeSettings({
      showContextMenu: false,
      temporaryChat: true,
      webSearch: true,
      openIn: "new-window",
      promptTemplate: "Explain: {query}",
    }),
    {
      ...DEFAULT_SETTINGS,
      contextMenuMode: "off",
      temporaryChat: true,
      webSearch: true,
      openIn: "new-window",
      promptTemplate: "Explain: {query}",
    },
  );
});

test("missing keys fall back individually", () => {
  const merged = mergeSettings({ openIn: "new-window" });
  assert.equal(merged.openIn, "new-window");
  assert.equal(merged.contextMenuMode, "simple");
  assert.equal(merged.temporaryChat, DEFAULT_SETTINGS.temporaryChat);
  assert.equal(merged.promptTemplate, DEFAULT_SETTINGS.promptTemplate);
});

test("unknown keys are dropped", () => {
  const merged = mergeSettings({ model: "auto", nope: "gone", openInn: "typo" });
  assert.deepEqual(Object.keys(merged).sort(), Object.keys(DEFAULT_SETTINGS).sort());
  assert.equal("nope" in merged, false);
});

test("wrong types fall back to the default", () => {
  const merged = mergeSettings({
    showContextMenu: "false",
    model: 123,
    temporaryChat: "yes",
    webSearch: 1,
    promptTemplate: [],
  });
  assert.equal(merged.contextMenuMode, "simple");
  assert.equal("model" in merged, false);
  assert.equal(merged.temporaryChat, DEFAULT_SETTINGS.temporaryChat);
  assert.equal(merged.webSearch, DEFAULT_SETTINGS.webSearch);
  assert.equal(merged.promptTemplate, DEFAULT_SETTINGS.promptTemplate);
});

test("an out-of-range openIn falls back to the default", () => {
  assert.equal(mergeSettings({ openIn: "teleport" }).openIn, DEFAULT_SETTINGS.openIn);
  assert.equal(mergeSettings({ openIn: "" }).openIn, DEFAULT_SETTINGS.openIn);
});

test("each documented openIn value is accepted", () => {
  for (const value of ["new-tab", "background-tab", "new-window"]) {
    assert.equal(mergeSettings({ openIn: value }).openIn, value);
  }
});

test("mergeSettings does not mutate DEFAULT_SETTINGS", () => {
  mergeSettings({ openIn: "new-window" });
  assert.equal(DEFAULT_SETTINGS.openIn, "new-tab");
});

test("previously saved model selections are ignored", () => {
  assert.deepEqual(mergeSettings({ model: "gpt-5.6-sol" }), DEFAULT_SETTINGS);
});


test("legacy mode migrates and a valid new mode wins", () => {
  assert.equal(mergeSettings({ showContextMenu: false }).contextMenuMode, "off");
  assert.equal(mergeSettings({ showContextMenu: true }).contextMenuMode, "simple");
  assert.equal(mergeSettings({ showContextMenu: false, contextMenuMode: "advanced" }).contextMenuMode, "advanced");
  assert.equal(mergeSettings({ showContextMenu: false, contextMenuMode: "bad" }).contextMenuMode, "off");
});

test("translation defaults and Unicode language limits are safe", () => {
  assert.equal(mergeSettings({}).showTranslate, false);
  assert.equal(mergeSettings({}).translationMode, "ask");
  assert.equal(mergeSettings({ translationLanguage: " Spanish " }).translationLanguage, "Spanish");
  assert.equal(mergeSettings({ translationLanguage: "😀".repeat(100) }).translationLanguage, "😀".repeat(100));
  assert.equal(mergeSettings({ translationLanguage: "😀".repeat(101) }).translationLanguage, "");
  assert.equal(mergeSettings({ translationLanguage: 42, translationMode: "bad", showTranslate: "yes" }).translationMode, "ask");
});

test("load includes legacy-only preferences and save filters unknown keys", async () => {
  const { load, save } = await import("../lib/settings.js");
  let saved;
  globalThis.browser = { storage: { sync: {
    get: async (keys) => Object.fromEntries(keys.filter(k => k === "showContextMenu").map(k => [k, false])),
    set: async (value) => { saved = value; },
  } } };
  try {
    assert.equal((await load()).contextMenuMode, "off");
    await save({ ...DEFAULT_SETTINGS, contextMenuMode: "advanced", unknown: true });
    assert.equal(saved.contextMenuMode, "advanced");
    assert.equal("unknown" in saved, false);
  } finally { delete globalThis.browser; }
});

test("partial saves preserve unrelated stored preferences", async () => {
  const { save } = await import("../lib/settings.js");
  const stored = { contextMenuMode: "advanced", translationLanguage: "Spanish", promptTemplate: "Explain {query}" };
  globalThis.browser = { storage: { sync: { set: async patch => Object.assign(stored, patch) } } };
  try {
    await save({ webSearch: true });
    assert.equal(stored.contextMenuMode, "advanced");
    assert.equal(stored.translationLanguage, "Spanish");
    assert.equal(stored.promptTemplate, "Explain {query}");
    assert.equal(stored.webSearch, true);
  } finally { delete globalThis.browser; }
});