/**
 * @file terminalTheme.test.ts
 * @description Tests for the xterm theme builder: CSS-variable RGB triplets
 * become hex, status/accent map to the ANSI hues, bright twins are lighter,
 * and the probe resolves a named dark theme's variables.
 * @author Nguyễn Ngọc Trí Vĩ <vinnt@smartgift.vn>
 */
import { describe, it, expect } from "vitest";
import { buildTerminalTheme, terminalThemeFor } from "../terminalTheme";

const vars: Record<string, string> = {
  "--surface-0": " 17 17 19",
  "--surface-3": "39 42 45",
  "--fg-primary": "237 238 240",
  "--fg-secondary": "176 180 186",
  "--fg-muted": "105 110 119",
  "--border-light": "67 72 78",
  "--accent": "0 144 255",
  "--status-success": "61 214 140",
  "--status-danger": "255 149 146",
  "--status-warning": "255 202 22",
};

describe("buildTerminalTheme", () => {
  it("maps theme tokens onto the xterm palette", () => {
    const t = buildTerminalTheme((n) => vars[n] ?? "");
    expect(t.background).toBe("#111113");
    expect(t.foreground).toBe("#edeef0");
    expect(t.cursor).toBe("#edeef0");
    expect(t.selectionBackground).toBe("#43484e");
    expect(t.red).toBe("#ff9592");
    expect(t.green).toBe("#3dd68c");
    expect(t.yellow).toBe("#ffca16");
    expect(t.blue).toBe("#0090ff");
    expect(t.black).toBe("#43484e");
    expect(t.brightBlack).toBe("#696e77");
    expect(t.brightWhite).toBe("#edeef0");
  });

  it("makes each bright twin lighter than its base colour", () => {
    const t = buildTerminalTheme((n) => vars[n] ?? "");
    const sum = (hex: string) =>
      [1, 3, 5].reduce((a, i) => a + parseInt(hex.slice(i, i + 2), 16), 0);
    for (const c of ["red", "green", "yellow", "blue", "magenta", "cyan"] as const) {
      const base = t[c]!;
      const bright = t[`bright${c[0]!.toUpperCase()}${c.slice(1)}` as keyof typeof t] as string;
      expect(sum(bright)).toBeGreaterThan(sum(base));
    }
  });

  it("leaves a colour unset when its variable is missing, so xterm keeps its default", () => {
    const t = buildTerminalTheme(() => "");
    expect(t.background).toBeUndefined();
    expect(t.red).toBeUndefined();
  });
});

describe("terminalThemeFor", () => {
  it("resolves variables on a dark probe scoped to the theme id, then removes it", () => {
    const style = document.createElement("style");
    style.textContent = `.dark { --surface-0: 1 2 3; } .dark[data-theme="darcula"] { --surface-0: 30 31 32; }`;
    document.head.appendChild(style);
    try {
      expect(terminalThemeFor("default").background).toBe("#010203");
      expect(terminalThemeFor("darcula").background).toBe("#1e1f20");
      expect(document.body.children).toHaveLength(0);
    } finally {
      style.remove();
    }
  });
});