import type { Organization } from 'fhir/r4';

// Organization-level booking policy. Mirrors the server's appointment-booking-flags.ts - the
// plugin WRITES this exact URL, the server READS it - so the literal MUST match byte for byte.
// Uses the StructureDefinition convention shared with the schedule booking flags.
export const ORGANIZATION_REQUIRE_NEW_PATIENT_EXAM_FIRST_EXTENSION_URL =
    'https://akashichealthrecords.com/fhir/StructureDefinition/organization-require-new-patient-exam-first';

// Organization booking mode (mirrors the server, byte-identical URL): `direct` or
// `request-only`. In request-only, patient self-bookings become `proposed` requests a
// receptionist confirms. Default `direct` when the extension is absent.
export const ORGANIZATION_BOOKING_MODE_EXTENSION_URL =
    'https://akashichealthrecords.com/fhir/StructureDefinition/organization-booking-mode';

// `direct`: online self-bookings confirm immediately. `review`: a self-booking holds its chosen slot
// as `pending` for staff approval. `request-only`: a self-booking becomes a `proposed` request staff
// schedule. The server enforces this; the plugin mirrors the extension URL.
export type OrganizationBookingMode = 'direct' | 'review' | 'request-only';

// How a request-only organization wants patient self-bookings expressed. `preferred-slot`: patient
// picks a preferred practitioner + a real (held) slot. `time-window`: patient gives preferred days +
// times of day with no practitioner/slot, and the receptionist places it. Only meaningful under
// request-only. Default `preferred-slot` when the extension is absent.
export const ORGANIZATION_REQUEST_STYLE_EXTENSION_URL =
    'https://akashichealthrecords.com/fhir/StructureDefinition/organization-request-style';

export type OrganizationRequestStyle = 'preferred-slot' | 'time-window';

// Retired: the consult is now recognised by its service's SNOMED type, not by a role list. Kept only so
// saves strip the stale extension from organizations that still carry it.
export const RETIRED_ORGANIZATION_NEW_PATIENT_EXAM_ROLES_EXTENSION_URL =
    'https://akashichealthrecords.com/fhir/StructureDefinition/organization-new-patient-exam-roles';

// Org-wide default appointment duration (minutes). Every appointment inherits it unless the Visit service
// overrides it (see config/appointmentDuration). Byte-identical URL across plugin + infra. Ships at 60 min.
export const ORGANIZATION_DEFAULT_APPOINTMENT_DURATION_EXTENSION_URL =
    'https://akashichealthrecords.com/fhir/StructureDefinition/organization-default-appointment-duration';

// Pure reader - safe outside hook/React context (e.g. patient booking gating). Defaults:
// require-new-patient-exam-first false, booking mode `direct`.
export const getOrganizationPolicyFlags = (
    organization?: Organization,
): {
    requireNewPatientExamFirst: boolean;
    bookingMode: OrganizationBookingMode;
    requestStyle: OrganizationRequestStyle;
    defaultAppointmentDurationMinutes: number;
} => {
    const extensions = organization?.extension ?? [];
    const bookingModeCode = extensions.find(
        (e) => e.url === ORGANIZATION_BOOKING_MODE_EXTENSION_URL,
    )?.valueCode;
    return {
        requireNewPatientExamFirst:
            extensions.find((e) => e.url === ORGANIZATION_REQUIRE_NEW_PATIENT_EXAM_FIRST_EXTENSION_URL)
                ?.valueBoolean ?? false,
        bookingMode:
            bookingModeCode === 'request-only'
                ? 'request-only'
                : bookingModeCode === 'review'
                  ? 'review'
                  : 'direct',
        requestStyle:
            extensions.find((e) => e.url === ORGANIZATION_REQUEST_STYLE_EXTENSION_URL)?.valueCode ===
            'time-window'
                ? 'time-window'
                : 'preferred-slot',
        // Org-wide default appointment length; the 1-hour ship-default when unset.
        defaultAppointmentDurationMinutes:
            extensions.find((e) => e.url === ORGANIZATION_DEFAULT_APPOINTMENT_DURATION_EXTENSION_URL)
                ?.valueInteger || 60,
    };
};