// What a node in a delegated surface MEANS, and what the page bar reads as.
// Both are decisions, so neither needs a browser — context/code/clients.md.

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

import {
  cellAction,
  cellAttrs,
  gridPlan,
  indexAction,
  menuKey,
  pageEntries,
  pageItemAction,
} from "../shell.js";

const cell = (text, extra = {}) => ({
  text,
  numeric: true,
  error: false,
  selected: false,
  editable: true,
  ...extra,
});

/// The shape the row index has to survive: a group header between data rows,
/// which is exactly what walking the table back up would get wrong.
function grouped() {
  return {
    row_levels: 1,
    col_levels: [["Revenue", "Cost"]],
    col_groups: [],
    totals: [],
    editing: null,
    rows: [
      { kind: "group", label: "Hot", collapsed: false },
      { kind: "data", labels: ["Espresso"], cells: [cell("1"), cell("2")] },
      { kind: "group", label: "Cold", collapsed: true },
      {
        kind: "data",
        labels: ["Cold Brew"],
        cells: [cell("3", { editable: false }), cell("4")],
      },
    ],
  };
}

test("a cell's attributes carry the plan's answers back to the handler", () => {
  const plan = gridPlan(grouped());
  const last = plan.body.at(-1).cells[1];
  const action = cellAction(cellAttrs(last), last.editable);
  assert.deepEqual(action, { row: 1, col: 1, editable: true });
});

// improvise-b8ot: the DATA row index is what a click sends, and `gridPlan`
// counts it because a group header is not a data row. A delegated handler
// that inferred the row from the node's position in the table would say 3.
test("the row a delegated click means is the data index, not the table row", () => {
  const plan = gridPlan(grouped());
  const rows = plan.body
    .filter((r) => r.kind === "data")
    .map((r) => cellAction(cellAttrs(r.cells[0]), r.cells[0].editable).row);
  assert.deepEqual(rows, [0, 1]);
});

test("editable is the class, so an unsettable cell opens no editor", () => {
  const plan = gridPlan(grouped());
  const aggregate = plan.body.at(-1).cells[0];
  assert.equal(aggregate.classes.editable, false);
  assert.equal(cellAction(cellAttrs(aggregate), false).editable, false);
});

// Every header, the corner and the totals strip reach the delegated handler
// too. None of them is a cell, and `Number("")` is 0 rather than nothing.
test("a node carrying no coordinates means nothing at all", () => {
  assert.equal(cellAction({}, false), null);
  assert.equal(cellAction({ row: "0" }, false), null);
  assert.equal(cellAction({ row: "", col: "" }, false), null);
  assert.equal(cellAction({ row: "x", col: "0" }, false), null);
  assert.equal(cellAction({ row: "1.5", col: "0" }, false), null);
});

test("an index surface reads its row back, and nothing else", () => {
  assert.equal(indexAction({ index: "0" }), 0);
  assert.equal(indexAction({ index: "12" }), 12);
  assert.equal(indexAction({}), null);
  assert.equal(indexAction({ index: "" }), null);
  assert.equal(indexAction({ index: "-1" }), null);
});

// improvise-p7lh: a grid filtered to Q1 said nothing at all, and `[`/`]`
// moved it in silence. The bar is what says which quarter this is.
test("the page bar names the category and the item it is fixed to", () => {
  const [entry] = pageEntries({
    page_coords: [
      {
        cat: "Quarter",
        selected: "Q2",
        cycle: { at: 1, count: 4, items: ["Q1", "Q2", "Q3", "Q4"] },
      },
    ],
  });
  assert.equal(entry.text, "Quarter = Q2");
  assert.equal(entry.position, "2/4", "one-based, as a user counts");
  assert.equal(entry.navigable, true);
});

// Gotcha 27: Page is navigable and Filter is not. A Filter axis offers no
// position, because there is no key that would move it.
test("a filter axis is shown, and is not offered as something to cycle", () => {
  const [entry] = pageEntries({
    page_coords: [{ cat: "Region", selected: "North", cycle: null }],
  });
  assert.equal(entry.text, "Region = North");
  assert.equal(entry.position, "");
  assert.equal(entry.navigable, false);
});

test("no fixed categories is an empty bar, not a blank one", () => {
  assert.deepEqual(pageEntries({ page_coords: [] }), []);
});

// improvise-rw6l: the arrow and the menu follow `cycle`, which is the Page /
// Filter split decided in Rust — never "is there an entry on the bar".
test("a page axis offers its items, and a filter axis offers none", () => {
  const [page, filter] = pageEntries({
    page_coords: [
      {
        cat: "Quarter",
        selected: "Q3",
        cycle: { at: 2, count: 3, items: ["Q1", "Q2", "Q3"] },
      },
      { cat: "Region", selected: "North", cycle: null },
    ],
  });
  assert.deepEqual(page.items, [
    { item: 0, label: "Q1", selected: false },
    { item: 1, label: "Q2", selected: false },
    { item: 2, label: "Q3", selected: true },
  ]);
  assert.equal(page.index, 0, "the axis names itself by its place on the bar");
  assert.deepEqual(
    filter.items,
    [],
    "a Filter axis constrains without being navigable: nothing to pick",
  );
  assert.equal(filter.index, 1);
});

// One meaning across two surfaces (improvise-b8ot): a chip carries an axis, a
// menu row carries an axis AND an item. Nothing infers from structure.
test("a chip opens the menu and a menu row picks, one attribute apart", () => {
  assert.deepEqual(pageItemAction({ axis: "1" }), { kind: "open", axis: 1 });
  assert.deepEqual(pageItemAction({ axis: "1", item: "0" }), {
    kind: "pick",
    axis: 1,
    item: 0,
  });
  assert.equal(pageItemAction({}), null, "the gaps between the chips are not a chip");
  assert.equal(pageItemAction({ axis: "" }), null);
  assert.equal(pageItemAction({ axis: "-1" }), null);
  assert.deepEqual(
    pageItemAction({ axis: "0", item: "" }),
    { kind: "open", axis: 0 },
    "an empty item attribute is NO item, where Number('') would say 0",
  );
});

// The menu owns the keyboard while it is open, so every key is answered and
// nothing falls through to the grid it is anchored to.
test("the menu answers its own keys and swallows the rest", () => {
  const at = (active) => ({ count: 3, active });
  assert.deepEqual(menuKey("ArrowDown", at(0)), { kind: "move", item: 1 });
  assert.deepEqual(menuKey("j", at(2)), { kind: "move", item: 0 }, "and it wraps");
  assert.deepEqual(menuKey("ArrowUp", at(0)), { kind: "move", item: 2 }, "both ways");
  assert.deepEqual(menuKey("k", at(1)), { kind: "move", item: 0 });
  assert.deepEqual(menuKey("Home", at(2)), { kind: "move", item: 0 });
  assert.deepEqual(menuKey("End", at(0)), { kind: "move", item: 2 });
  assert.deepEqual(menuKey("Enter", at(1)), { kind: "pick", item: 1 });
  assert.deepEqual(menuKey(" ", at(1)), { kind: "pick", item: 1 });
  assert.deepEqual(menuKey("Escape", at(1)), { kind: "close" });
  assert.deepEqual(menuKey("Tab", at(1)), { kind: "close" });
  assert.deepEqual(
    menuKey("h", at(1)),
    { kind: "ignore" },
    "a grid key is SWALLOWED, not passed on — the grid is behind the menu",
  );
  assert.deepEqual(
    menuKey("ArrowDown", { count: 0, active: 0 }),
    { kind: "close" },
    "a menu with nothing in it cannot be moved around",
  );
});