const assert = require("node:assert/strict");
const fs = require("node:fs");
const path = require("node:path");
const vm = require("node:vm");
const { test } = require("node:test");

const factory = new vm.Script(`${fs.readFileSync(path.join(__dirname, "../src/features/opportunities/calendar.js"), "utf8")}\ncreateOpportunityCalendar;`).runInNewContext();
const plain = value => JSON.parse(JSON.stringify(value));
const opportunity = (number, date) => ({ OptyNumber: number, Name: `<Opportunity ${number}>`, EffectiveDate: date,
  ForecastGroup_c: "FORECAST", StatusCode: "OPEN", CustomerAccount: { PartyUniqueName: "Customer" } });

function setup(items = [opportunity("A", "2026-11-15")]) {
  let document;
  class Element {
    constructor(tag) { this.tag = tag; this.children = []; this.attributes = {}; this.listeners = {}; this.text = ""; this.isConnected = true; }
    set textContent(value) { this.text = value; this.children = []; }
    get textContent() { return this.text + this.children.map(child => child.textContent).join(""); }
    append(...nodes) { for (const child of nodes) { child.parent = this; this.children.push(child); } }
    setAttribute(key, value) { this.attributes[key] = value; }
    addEventListener(key, fn) { this.listeners[key] = fn; }
    focus() { document.activeElement = this; }
    remove() { this.parent.children = this.parent.children.filter(child => child !== this); this.isConnected = false; }
    click() { this.listeners.click?.({ target: this, preventDefault() {}, stopPropagation() {} }); }
  }
  const host = new Element("host");
  document = { createElement: tag => new Element(tag), getElementById: () => host };
  const state = { status: "ready", items };
  const h = { state, filtered: items, version: 1, instances: [], loads: 0, host, document };
  class Calendar {
    constructor(element, options) { this.element = element; this.options = options; this.events = options.events; this.dates = []; h.instances.push(this); }
    render() { this.rendered = true; }
    destroy() { this.destroyed = true; }
    updateSize() { this.resized = true; }
    batchRendering(fn) { fn(); }
    gotoDate(date) { this.dates.push(date); }
    removeAllEvents() { this.events = []; }
    addEventSource(events) { this.events = events; }
  }
  h.api = factory({ environment: { document }, loadLibrary: () => { h.loads++; return { Calendar }; },
    getState: () => state, getItems: () => h.filtered, getVersion: () => h.version,
    formatRevenue: () => "$100", formatDate: value => value.slice(0, 10), getOwnerName: () => "Owner",
    createDetailLink: (text, href) => { const a = new Element("a"); a.textContent = text; a.href = href; return a; },
    createCopyButton: () => new Element("button"), createCloseIcon: () => new Element("svg"),
    createViewIcon: view => { const icon = new Element("svg"); icon.view = view; return icon; },
    createStageBadge: () => new Element("span"), createStatusBadge: () => new Element("span"),
    opportunityUrl: "https://example.invalid/?puid=", modalId: "modal", closeSrPopover() {} });
  h.body = new Element("body"); h.table = new Element("table-surface"); host.append(h.body);
  const walk = element => [element, ...element.children.flatMap(walk)];
  h.nodes = () => walk(host);
  h.byClass = name => h.nodes().find(element => element.className === name);
  h.mount = () => h.api.mount(h.body, h.table);
  h.activate = () => { h.mount(); h.api.selectView("calendar"); return h.instances[0]; };
  return h;
}

test("calendar controls, accessibility labels and missing dates are English", () => {
  const h = setup([opportunity("A", "2026-11-15"), opportunity("B", null)]);
  const { options } = h.activate();
  assert.equal(options.locale, "en");
  assert.deepEqual(plain(options.buttonText), { today: "Today", month: "Month", week: "Week" });
  assert.deepEqual(plain(options.buttonHints), { prev: "Previous", next: "Next", today: "Today", dayGridMonth: "Month", dayGridWeek: "Week" });
  assert.equal(options.moreLinkHint(1), "View 1 more opportunity");
  assert.equal(options.moreLinkHint(3), "View 3 more opportunities");
  assert.ok(h.nodes().some(node => node.attributes["aria-label"] === "Opportunity views"));
  assert.ok(h.nodes().some(node => node.textContent === "No valid Close Date (1)"));
});

test("close dates retain the API day across offsets and reject invalid dates", () => {
  const { api } = setup();
  for (const date of ["2026-11-15", "2026-11-15T00:00:00Z", "2026-11-15T23:00:00-05:00"]) assert.equal(api.closeDate(date), "2026-11-15");
  assert.equal(api.closeDate("2028-02-29"), "2028-02-29");
  for (const value of [null, undefined, "", "2026-02-29", "2026-13-01", "2026-04-31", "15/11/2026", 123]) assert.equal(api.closeDate(value), null);
});

test("fiscal week labels use June-May years and Sunday weeks containing June 1", () => {
  const { api } = setup();
  for (const [day, expected] of [
    ["2026-05-24", "FY26-Q4-W52"], ["2026-05-31", "FY27-Q1-W1"],
    ["2026-06-01", "FY27-Q1-W1"], ["2026-06-07", "FY27-Q1-W2"],
    ["2026-09-06", "FY27-Q2-W15"], ["2026-10-04", "FY27-Q2-W19"],
    ["2026-11-15", "FY27-Q2-W25"], ["2026-12-06", "FY27-Q3-W28"],
    ["2027-03-07", "FY27-Q4-W41"], ["2027-05-30", "FY28-Q1-W1"],
    ["2028-02-27", "FY28-Q3-W40"], ["2028-06-04", "FY29-Q1-W2"]
  ]) assert.equal(api.fiscalWeekLabel(new Date(`${day}T00:00:00Z`)), expected, day);
});

test("daily count badges follow filters and are cleaned up when cells unmount", () => {
  const h = setup([opportunity("A", "2026-11-15"), opportunity("B", "2026-11-15"), opportunity("C", "2026-11-15")]);
  const calendar = h.activate();
  const frame = h.document.createElement("div");
  const el = { querySelector: selector => { assert.equal(selector, ".fc-daygrid-day-frame"); return frame; } };
  calendar.options.dayCellDidMount({ el, date: new Date(2026, 10, 15) });
  const badge = frame.children[0];
  assert.equal(badge.textContent, "3");
  assert.equal(badge.hidden, false);
  assert.equal(badge.attributes["aria-label"], "3 opportunities");
  h.api.render([h.state.items[0]], h.state);
  assert.equal(badge.textContent, "1");
  assert.equal(badge.attributes["aria-label"], "1 opportunity");
  h.api.render([], h.state);
  assert.equal(badge.textContent, "0");
  assert.equal(badge.attributes["data-empty"], "true");
  assert.equal(badge.hidden, true);
  h.api.render(h.state.items, h.state);
  assert.equal(badge.hidden, false);
  assert.equal(badge.textContent, "3");
  calendar.options.dayCellWillUnmount({ el });
  assert.equal(frame.children.length, 0);
});

test("calendar events use EffectiveDate, all-day semantics and literal untrusted names", () => {
  const { api } = setup();
  const events = plain(api.eventsFor([opportunity("A", "2026-11-15"), opportunity("B", null)]));
  assert.equal(events.length, 1);
  assert.equal(events[0].start, "2026-11-15");
  assert.equal(events[0].allDay, true);
  assert.equal(events[0].title, "<Opportunity A>");
  assert.deepEqual(events[0].classNames, ["opportunities-calendar-stage-FORECAST"]);
});

test("initial calendar date selects the next close date, last past date or today", () => {
  const { api } = setup();
  const now = new Date(2026, 9, 5);
  assert.equal(api.initialDate([opportunity("A", "2026-11-15"), opportunity("B", "2026-10-12")], now), "2026-10-12");
  assert.equal(api.initialDate([opportunity("A", "2026-09-01"), opportunity("B", "2026-10-01")], now), "2026-10-01");
  assert.equal(api.initialDate([opportunity("A", null)], now), "2026-10-05");
});

test("overview is the default; tabs lazily initialize and reuse a monthly/weekly calendar", () => {
  const h = setup(); h.mount();
  const surface = h.byClass("opportunities-extension-calendar");
  assert.equal(h.table.hidden, false); assert.equal(surface.hidden, true); assert.equal(h.loads, 0);
  const tabs = h.nodes().filter(element => element.attributes.role === "tab");
  assert.deepEqual(tabs.map(tab => tab.children[0].view), ["overview", "calendar"]);
  assert.deepEqual(tabs.map(tab => tab.children[1].textContent), ["Overview", "Calendar"]);
  assert.equal(tabs[0].attributes["aria-selected"], "true");
  tabs[1].click();
  const instance = h.instances[0];
  assert.equal(h.table.hidden, true); assert.equal(surface.hidden, false);
  assert.equal(instance.options.initialView, "dayGridMonth");
  assert.equal(instance.options.height, "100%");
  assert.equal(instance.options.expandRows, true);
  assert.equal(instance.options.headerToolbar.right, "dayGridMonth,dayGridWeek");
  assert.equal(instance.options.editable, false);
  assert.equal(instance.options.dayMaxEvents, 2);
  assert.equal(instance.options.moreLinkText(7), "... +7");
  assert.equal(instance.options.weekNumbers, true);
  tabs[0].click(); tabs[1].click();
  assert.equal(h.loads, 1); assert.equal(h.instances.length, 1); assert.equal(instance.resized, true);
  tabs[1].listeners.keydown({ key: "Home", preventDefault() {} });
  assert.equal(h.table.hidden, false); assert.equal(h.document.activeElement, tabs[0]);
});

test("responsive event limit reserves room for every week and the overflow control", () => {
  const { api } = setup();
  assert.equal(api.visibleEventLimit(240, 6, 21), 0);
  assert.equal(api.visibleEventLimit(500, 5, 21), 1);
  assert.equal(api.visibleEventLimit(800, 5, 21), 2);
  assert.equal(api.visibleEventLimit(500, 1, 21), 2);
  assert.equal(api.visibleEventLimit(0, 6, 21), 0);
});

test("calendar follows filtered data; only a new Reference request changes its date", () => {
  const h = setup([opportunity("A", "2026-11-15"), opportunity("B", "2026-12-12")]);
  const calendar = h.activate();
  h.filtered = [h.state.items[1]]; h.api.render(h.filtered, h.state);
  assert.deepEqual(plain(calendar.events.map(event => event.id)), ["B"]);
  assert.equal(calendar.dates.length, 0);
  h.version++; h.state.items = [opportunity("C", "2027-02-20")]; h.filtered = h.state.items;
  h.api.render(h.filtered, h.state);
  assert.deepEqual(calendar.dates, ["2027-02-20"]);
  assert.deepEqual(plain(calendar.events.map(event => event.id)), ["C"]);
  h.filtered = []; h.api.render(h.filtered, h.state);
  assert.equal(calendar.events.length, 0);
  assert.equal(h.byClass("opportunities-calendar-message").textContent, "No opportunities found.");
});

test("undated opportunities remain visible and open read-only details", () => {
  const h = setup([opportunity("A", null)]); const calendar = h.activate();
  assert.equal(calendar.events.length, 0);
  const undated = h.byClass("opportunities-calendar-undated");
  assert.equal(undated.hidden, false); undated.children[1].click();
  assert.ok(h.nodes().some(node => node.attributes.role === "dialog"));
  assert.deepEqual(h.nodes().filter(node => node.tag === "dt").map(node => node.textContent), ["Customer", "Owner", "Close Date", "Amount"]);
  assert.equal(h.nodes().find(node => node.tag === "a").href, "https://example.invalid/?puid=A");
  assert.ok(h.nodes().some(node => node.tag === "dd" && node.textContent === "N/A"));
  assert.equal(h.api.closeDetails(), true);
  assert.equal(h.document.activeElement, undated.children[1]);
});

test("event details close on changed data, loading/error hide stale calendar content", () => {
  const h = setup(); const calendar = h.activate();
  calendar.options.eventClick({ event: { extendedProps: { item: h.state.items[0] } }, el: h.table, jsEvent: { preventDefault() {} } });
  assert.ok(h.nodes().some(node => node.attributes.role === "dialog"));
  h.api.render([], h.state);
  assert.ok(!h.nodes().some(node => node.attributes.role === "dialog"));
  for (const status of ["loading", "error", "empty"]) {
    h.api.render([], { status, items: [], message: "State message" });
    assert.equal(h.byClass("opportunities-calendar-grid").hidden, true);
    assert.equal(h.byClass("opportunities-calendar-undated").hidden, true);
    assert.equal(h.byClass("opportunities-calendar-message").textContent, "State message");
  }
});

test("overflow uses our dialog instead of the FullCalendar offsetParent-dependent popover", () => {
  const h = setup([opportunity("A", "2026-11-15"), opportunity("B", "2026-11-15"), opportunity("C", "2026-11-15")]);
  const calendar = h.activate();
  const trigger = h.document.createElement("a");
  const allSegs = calendar.events.map(event => ({ event }));
  const open = () => calendar.options.moreLinkClick({ date: new Date("2026-11-15T00:00:00Z"), allSegs,
    jsEvent: { currentTarget: trigger, preventDefault() {} } });
  assert.equal(open(), true, "truthy non-string result suppresses vendor popover");
  const list = h.byClass("opportunities-calendar-day-list");
  assert.equal(list.children.length, 3);
  assert.ok(list.children.every(button => button.children.length === 2 && button.children[1].textContent.includes(" | FORECAST | $100")));
  list.children[2].click();
  assert.ok(h.nodes().some(node => node.tag === "h2" && node.textContent === "<Opportunity C>"));
  h.api.closeDetails();
  assert.equal(h.document.activeElement, trigger);
  open(); h.api.selectView("overview");
  assert.ok(!h.nodes().some(node => node.attributes.role === "dialog"));
  h.api.selectView("calendar"); open();
  const dialog = h.nodes().find(node => node.attributes.role === "dialog");
  dialog.listeners.keydown({ key: "Escape", preventDefault() {}, stopPropagation() {} });
  assert.ok(!h.nodes().some(node => node.attributes.role === "dialog"));
});

test("calendar events show their stage and handle missing stage values", () => {
  const h = setup();
  const calendar = h.activate();
  for (const [value, label] of [["FORECAST", "FORECAST"], ["UPSIDE", "UPSIDE"], [null, "N/A"]]) {
    const item = { ...h.state.items[0], ForecastGroup_c: value };
    const { domNodes } = calendar.options.eventContent({ event: { title: item.Name, extendedProps: { item } } });
    assert.equal(domNodes[0].children.length, 2);
    assert.equal(domNodes[0].children[0].textContent, item.Name);
    assert.equal(domNodes[0].children[1].textContent, `A | ${label} | $100`);
    assert.equal(domNodes[0].children[1].title, `A | ${label} | $100`);
  }
});