import { describe, it, expect } from "vitest";
import {
  resolvePaneColors,
  toXtermTheme,
  DEFAULT_PANE_COLORS,
  COLOR_PRESETS,
  type PaneColors,
} from "./theme";

describe("resolvePaneColors", () => {
  it("falls back to defaults when nothing is set", () => {
    expect(resolvePaneColors(undefined, undefined)).toEqual(DEFAULT_PANE_COLORS);
  });

  it("uses global values over defaults", () => {
    const global: PaneColors = { background: "#111111", cursor: "#abcdef" };
    const r = resolvePaneColors(global, undefined);
    expect(r.background).toBe("#111111");
    expect(r.cursor).toBe("#abcdef");
    // Unset fields still come from defaults.
    expect(r.foreground).toBe(DEFAULT_PANE_COLORS.foreground);
    expect(r.selection).toBe(DEFAULT_PANE_COLORS.selection);
  });

  it("per-pane override wins over global, field by field", () => {
    const global: PaneColors = { background: "#111111", foreground: "#222222" };
    const override: PaneColors = { background: "#999999" };
    const r = resolvePaneColors(global, override);
    expect(r.background).toBe("#999999"); // override wins
    expect(r.foreground).toBe("#222222"); // inherits global
    expect(r.cursor).toBe(DEFAULT_PANE_COLORS.cursor); // inherits default
  });

  it("always returns all four fields defined", () => {
    const r = resolvePaneColors({}, {});
    expect(Object.keys(r).sort()).toEqual([
      "background",
      "cursor",
      "foreground",
      "selection",
    ]);
  });
});

describe("toXtermTheme", () => {
  it("maps resolved colours onto the xterm ITheme shape", () => {
    const theme = toXtermTheme({
      background: "#0c0c0c",
      foreground: "#c5c8c6",
      cursor: "#ffffff",
      selection: "#3a3a3a",
    });
    expect(theme.background).toBe("#0c0c0c");
    expect(theme.foreground).toBe("#c5c8c6");
    expect(theme.cursor).toBe("#ffffff");
    // selection maps to xterm 5.x's renamed property.
    expect(theme.selectionBackground).toBe("#3a3a3a");
    // cursorAccent is pinned to the background for block-cursor legibility.
    expect(theme.cursorAccent).toBe("#0c0c0c");
  });

  it("keeps the fixed softened white/brightWhite slice", () => {
    const theme = toXtermTheme(DEFAULT_PANE_COLORS);
    expect(theme.white).toBe("#c5c8c6");
    expect(theme.brightWhite).toBe("#e0e0e0");
  });
});

describe("COLOR_PRESETS", () => {
  it("starts with the tiletopia default and every preset is fully specified", () => {
    expect(COLOR_PRESETS[0].name).toBe("Tiletopia Dark");
    expect(COLOR_PRESETS[0].colors).toEqual(DEFAULT_PANE_COLORS);
    for (const p of COLOR_PRESETS) {
      for (const key of ["background", "foreground", "cursor", "selection"] as const) {
        expect(p.colors[key]).toMatch(/^#[0-9a-fA-F]{6}$/);
      }
    }
  });
});