/**
 * What the Schedules surface is allowed to SAY when the reader's view is narrowed to their own blocks.
 *
 *, measured as HR at a practice with no configured human-resources profile:
 * `GET /R4/Schedule` returned **200 with zero entries** while the receptionist saw 14, and the page said
 * *"0 schedule entries - No staff schedules found for this period."* at every time scale.
 *
 * THE SERVER IS CORRECT AND MUST NOT BE WIDENED. `resolveSchedulesScope` gives an unconfigured
 * non-front-desk role scope `own` - ruling, so an org that has granted nothing does not hand
 * out everyone's availability. HR then genuinely has no schedules of their own, so **zero is the honest
 * DATA**; only the SENTENCE was wrong.
 *
 * WHY A MODULE FOR THREE STRINGS. The refusal arrives as a 200 with an empty set and never a 403, so
 * nothing downstream can tell *"scoped out"* from *"this practice has none"*
 *. That makes the wording the entire fix, and a
 * wording inlined as a ternary in a 1,000-line page is not something a test can hold. Here it is a value,
 * and the invariant below - **no narrowed sentence may assert a practice-wide absence** - is checkable
 * rather than merely intended.
 *
 * It names the FIX, not just the limit, the same shape used on the staff page: the reader's
 * next question is always *"so how do I see the rest?"*.
 */
export interface SchedulesScopeCopy {
    /** The page subtitle. The org-wide promise is WITHDRAWN when narrowed, never left standing. */
    subtitle: string;
    /** The calendar's own empty state. */
    noEvents: string;
    /** Whether to render the explanatory notice. */
    showNotice: boolean;
    /** The line above the list. Own scope has no other staff member for an entry to focus on. */
    listHint?: string;
}

const ORG_WIDE_SUBTITLE =
    'Working hours, locations and time off.';

/**
 * THE SENTENCE THIS CARD EXISTS TO DELETE. Exported so the guard can assert it never reaches a
 * narrowed reader, rather than the test carrying its own copy of the string and drifting from the page.
 */
export const PRACTICE_WIDE_EMPTY_SENTENCE = 'No staff schedules found for this period.';

/**
 * `mayViewAny` IS THE HALF THIS FUNCTION USED TO ASSUME, and the assumption was false.
 *
 * The scope answers WHOSE schedules; it says nothing about whether the reader may see any. A stored
 * profile of `{ schedules: level none, scope all }` is a real shape - measured on Great River's HR
 * role - and it arrived here as `onlyOwnSchedules: false`, which rendered the org-wide subtitle and
 * `PRACTICE_WIDE_EMPTY_SENTENCE` at somebody entitled to nothing.
 *
 * That is the exact sentence the comment above calls the one this module exists to delete, reaching
 * a narrowed reader through the LEVEL rather than through the scope. A false claim about the practice
 * is worse than a narrow one about the reader, so `none` gets its own words rather than borrowing
 * `own`'s - "only your own" is also untrue when the answer is none.
 */
export const schedulesScopeCopy = (
    onlyOwnSchedules: boolean,
    mayViewAny = true,
): SchedulesScopeCopy =>
    !mayViewAny
        ? {
            subtitle: 'Your role cannot see staff schedules.',
            noEvents: 'Your role cannot see staff schedules, so none are listed here.',
            showNotice: true,
            listHint: 'Working hours do not indicate free appointment slots.',
        }
        : onlyOwnSchedules
        ? {
            subtitle: 'Your role can see only your own schedules.',
            noEvents: 'You have no schedules of your own for this period.',
            showNotice: true,
            // No hint: the practitioner deck draws none under your own week, and each row already says Bookable.
        }
        : {
            subtitle: ORG_WIDE_SUBTITLE,
            noEvents: PRACTICE_WIDE_EMPTY_SENTENCE,
            showNotice: false,
            listHint: 'Select an entry to focus on that staff member. Working hours do not indicate free appointment slots.',
        };

// admin "A day with nobody on it": an empty day names itself, so a quiet Sunday never reads like a
// page that lost its data. The date is drawn in the viewer's own timezone.
export const emptyDaySentence = (day: Date): string =>
    `Nobody is scheduled on ${day.toLocaleDateString('en-GB', { weekday: 'long', day: 'numeric', month: 'long' }).replace(',', '')}`;

export const EMPTY_DAY_HINT = 'Coverage is set on each person’s own schedule, under Staff.';

export const scheduleEntriesLabel = (count: number): string =>
    count === 0 ? 'no schedule entries' : `${count} ${count === 1 ? 'schedule entry' : 'schedule entries'}`;