import fs from "node:fs";

function assert(condition, message) {
  if (!condition) throw new Error(message);
}

const page = fs.readFileSync(
  new URL(
    "../src/features/calendar/CalendarPage.tsx",
    import.meta.url,
  ),
  "utf8",
);
const views = fs.readFileSync(
  new URL(
    "../src/features/calendar/CalendarViews.tsx",
    import.meta.url,
  ),
  "utf8",
);
const model = fs.readFileSync(
  new URL(
    "../src/features/calendar/calendarViewModel.ts",
    import.meta.url,
  ),
  "utf8",
);
const collectionDialogs = fs.readFileSync(
  new URL(
    "../src/features/calendar/CalendarCollectionDialogs.tsx",
    import.meta.url,
  ),
  "utf8",
);
const eventDialog = fs.readFileSync(
  new URL(
    "../src/features/calendar/CalendarEventDialog.tsx",
    import.meta.url,
  ),
  "utf8",
);

assert(
  page.includes('from "./CalendarViews"'),
  "CalendarPage must compose the focused calendar view components",
);
assert(
  !page.includes("function CalendarWeekRows("),
  "CalendarPage must not own month/continuous rendering",
);
assert(
  !page.includes("function CalendarTimeGrid("),
  "CalendarPage must not own time-grid rendering",
);
assert(
  views.includes("export function CalendarWeekRows(") &&
    views.includes("export function CalendarTimeGrid("),
  "CalendarViews must own both view families",
);
assert(
  model.includes("export function layoutTimedEventsForDay(") &&
    model.includes("export function continuousVirtualWindow("),
  "calendar layout and virtualization must remain independently testable",
);
assert(
  !page.includes("function CalendarCollectionDialog(") &&
    !page.includes("function CalendarEventDialog("),
  "CalendarPage must not own source or event form dialogs",
);
assert(
  collectionDialogs.includes(
    "export function CalendarCollectionDialog(",
  ) &&
    eventDialog.includes("export function CalendarEventDialog("),
  "calendar dialogs must remain focused components",
);

console.log("Calendar page decomposition checks passed.");