import { FontAwesomeIcon } from '@fortawesome/react-fontawesome';
import { faPlus, faTrash } from '@fortawesome/pro-duotone-svg-icons';
import { parseDate, getLocalTimeZone, today } from '@internationalized/date';
import type { DateValue } from 'react-aria-components';
import { Input } from '@/components/base/input/input';
import { Select } from '@/components/base/select/select';
import { Toggle } from '@/components/base/toggle/toggle';
import { Button } from '@/components/base/buttons/button';
import { DatePicker } from '@/components/application/date-picker/date-picker';
import { TimePicker } from '@/components/application/date-picker/time-picker';
import {
    DaySelector,
    defaultDaySelection,
    type DaySelection,
} from '@/components/application/day-selector/day-selector';

// Reusable clinic form used by /settings/clinics slideout and the /setup
// wizard step. The parent owns form state + the save flow so it can decide
// how to orchestrate the multi-step create chain (one createClinic, then one
// createHoliday per holiday, then one createClinicRequiredDocument per doc).
//
// Schema (matches the Clinic entity in
// FortyTwoApps/helix-engage/src/objects/clinic.object.ts, column names
// derived from SDK labels — that's why opensAt/closesAt and not openTime/
// closeTime):
//   - clinicName (TEXT)
//   - address (ADDRESS → addressCustomAddress*)
//   - phone (PHONES)
//   - email (EMAILS)
//   - openMonday..openSunday (7 BOOLEANs)
//   - opensAt / closesAt (TEXT, HH:MM)
//   - status (SELECT enum)
//   - walkInAllowed / onlineBooking (BOOLEAN)
//   - cancellationWindowHours / arriveEarlyMin (NUMBER)
//
// Plus two child entities populated separately:
//   - Holiday (one record per closure date)
//   - ClinicRequiredDocument (one record per required doc type)

export type ClinicStatus = 'ACTIVE' | 'TEMPORARILY_CLOSED' | 'PERMANENTLY_CLOSED';

// Matches the SELECT enum on ClinicRequiredDocument. Keep in sync with
// FortyTwoApps/helix-engage/src/objects/clinic-required-document.object.ts.
export type DocumentType =
    | 'ID_PROOF'
    | 'AADHAAR'
    | 'PAN'
    | 'REFERRAL_LETTER'
    | 'PRESCRIPTION'
    | 'INSURANCE_CARD'
    | 'PREVIOUS_REPORTS'
    | 'PHOTO'
    | 'OTHER';

const DOCUMENT_TYPE_LABELS: Record<DocumentType, string> = {
    ID_PROOF: 'Government ID',
    AADHAAR: 'Aadhaar Card',
    PAN: 'PAN Card',
    REFERRAL_LETTER: 'Referral Letter',
    PRESCRIPTION: 'Prescription',
    INSURANCE_CARD: 'Insurance Card',
    PREVIOUS_REPORTS: 'Previous Reports',
    PHOTO: 'Passport Photo',
    OTHER: 'Other',
};

const DOCUMENT_TYPE_ORDER: DocumentType[] = [
    'ID_PROOF',
    'AADHAAR',
    'PAN',
    'REFERRAL_LETTER',
    'PRESCRIPTION',
    'INSURANCE_CARD',
    'PREVIOUS_REPORTS',
    'PHOTO',
    'OTHER',
];

export type ClinicHolidayEntry = {
    // Populated on the existing record when editing; undefined for freshly
    // added holidays the user hasn't saved yet. Used by the parent to
    // decide create vs update vs delete on save.
    id?: string;
    date: string; // ISO yyyy-MM-dd
    label: string;
};

export type ClinicFormValues = {
    // Core clinic fields
    clinicName: string;
    addressStreet1: string;
    addressStreet2: string;
    addressCity: string;
    addressState: string;
    addressPostcode: string;
    phone: string;
    email: string;
    // Schedule — simple pattern
    openDays: DaySelection;
    opensAt: string | null;
    closesAt: string | null;
    // Status + booking policy
    status: ClinicStatus;
    walkInAllowed: boolean;
    onlineBooking: boolean;
    cancellationWindowHours: string;
    arriveEarlyMin: string;
    // Children (persisted via separate mutations)
    requiredDocumentTypes: DocumentType[];
    holidays: ClinicHolidayEntry[];
};

export const emptyClinicFormValues = (): ClinicFormValues => ({
    clinicName: '',
    addressStreet1: '',
    addressStreet2: '',
    addressCity: '',
    addressState: '',
    addressPostcode: '',
    phone: '',
    email: '',
    openDays: defaultDaySelection(),
    opensAt: '09:00',
    closesAt: '18:00',
    status: 'ACTIVE',
    walkInAllowed: true,
    onlineBooking: true,
    cancellationWindowHours: '24',
    arriveEarlyMin: '15',
    requiredDocumentTypes: [],
    holidays: [],
});

const STATUS_ITEMS = [
    { id: 'ACTIVE', label: 'Active' },
    { id: 'TEMPORARILY_CLOSED', label: 'Temporarily closed' },
    { id: 'PERMANENTLY_CLOSED', label: 'Permanently closed' },
];

// Build the payload for `createClinic` / `updateClinic`. Holidays and
// required-documents are NOT included here — they're child records with
// their own mutations, orchestrated by the parent component after the
// clinic itself has been created and its id is known.
export const clinicCoreToGraphQLInput = (v: ClinicFormValues): Record<string, unknown> => {
    const input: Record<string, unknown> = {
        clinicName: v.clinicName.trim(),
        status: v.status,
        walkInAllowed: v.walkInAllowed,
        onlineBooking: v.onlineBooking,
        openMonday: v.openDays.monday,
        openTuesday: v.openDays.tuesday,
        openWednesday: v.openDays.wednesday,
        openThursday: v.openDays.thursday,
        openFriday: v.openDays.friday,
        openSaturday: v.openDays.saturday,
        openSunday: v.openDays.sunday,
    };

    // Column names on the platform come from the SDK `label`, not
    // `name`. "Opens At" → opensAt, "Closes At" → closesAt.
    if (v.opensAt) input.opensAt = v.opensAt;
    if (v.closesAt) input.closesAt = v.closesAt;

    const hasAddress =
        v.addressStreet1 || v.addressCity || v.addressState || v.addressPostcode;
    if (hasAddress) {
        input.addressCustom = {
            addressStreet1: v.addressStreet1 || null,
            addressStreet2: v.addressStreet2 || null,
            addressCity: v.addressCity || null,
            addressState: v.addressState || null,
            addressPostcode: v.addressPostcode || null,
            addressCountry: 'India',
        };
    }

    if (v.phone.trim()) {
        input.phone = {
            primaryPhoneNumber: v.phone.trim(),
            primaryPhoneCountryCode: 'IN',
            primaryPhoneCallingCode: '+91',
            additionalPhones: null,
        };
    }

    if (v.email.trim()) {
        input.email = {
            primaryEmail: v.email.trim(),
            additionalEmails: null,
        };
    }

    if (v.cancellationWindowHours.trim()) {
        const n = Number(v.cancellationWindowHours);
        if (!Number.isNaN(n)) input.cancellationWindowHours = n;
    }
    if (v.arriveEarlyMin.trim()) {
        const n = Number(v.arriveEarlyMin);
        if (!Number.isNaN(n)) input.arriveEarlyMin = n;
    }

    return input;
};

// Helper: build HolidayCreateInput payloads. Use after the clinic has
// been created and its id is known.
export const holidayInputsFromForm = (
    v: ClinicFormValues,
    clinicId: string,
): Array<Record<string, unknown>> =>
    v.holidays.map((h) => ({
        date: h.date,
        reasonLabel: h.label.trim() || null, // column name matches the SDK label "Reason / Label"
        clinicId,
    }));

// Helper: build ClinicRequiredDocumentCreateInput payloads. One per
// selected document type.
export const requiredDocInputsFromForm = (
    v: ClinicFormValues,
    clinicId: string,
): Array<Record<string, unknown>> =>
    v.requiredDocumentTypes.map((t) => ({
        documentType: t,
        clinicId,
    }));

type ClinicFormProps = {
    value: ClinicFormValues;
    onChange: (value: ClinicFormValues) => void;
};

export const ClinicForm = ({ value, onChange }: ClinicFormProps) => {
    const patch = (updates: Partial<ClinicFormValues>) => onChange({ ...value, ...updates });

    // Required-docs add/remove handlers. The user picks a type from the
    // dropdown; it gets added to the list; the pill row below shows
    // selected types with an X to remove. Dropdown filters out
    // already-selected types so the user can't pick duplicates.
    const availableDocTypes = DOCUMENT_TYPE_ORDER.filter(
        (t) => !value.requiredDocumentTypes.includes(t),
    ).map((t) => ({ id: t, label: DOCUMENT_TYPE_LABELS[t] }));

    const addDocType = (type: DocumentType) => {
        if (value.requiredDocumentTypes.includes(type)) return;
        patch({ requiredDocumentTypes: [...value.requiredDocumentTypes, type] });
    };

    const removeDocType = (type: DocumentType) => {
        patch({
            requiredDocumentTypes: value.requiredDocumentTypes.filter((t) => t !== type),
        });
    };

    // Holiday add/remove handlers. Freshly-added entries have no `id`
    // field; the parent's save flow treats those as "create".
    const addHoliday = () => {
        const todayIso = today(getLocalTimeZone()).toString();
        patch({ holidays: [...value.holidays, { date: todayIso, label: '' }] });
    };

    const updateHoliday = (index: number, updates: Partial<ClinicHolidayEntry>) => {
        const next = [...value.holidays];
        next[index] = { ...next[index], ...updates };
        patch({ holidays: next });
    };

    const removeHoliday = (index: number) => {
        patch({ holidays: value.holidays.filter((_, i) => i !== index) });
    };

    return (
        <div className="flex flex-col gap-4">
            <Input
                label="Clinic name"
                isRequired
                placeholder="e.g. Main Hospital Campus"
                value={value.clinicName}
                onChange={(v) => patch({ clinicName: v })}
            />

            <Select
                label="Status"
                placeholder="Select status"
                items={STATUS_ITEMS}
                selectedKey={value.status}
                onSelectionChange={(key) => patch({ status: key as ClinicStatus })}
            >
                {(item) => <Select.Item id={item.id} label={item.label} />}
            </Select>

            {/* Address */}
            <div className="flex flex-col gap-3">
                <p className="text-xs font-semibold uppercase tracking-wider text-quaternary">
                    Address
                </p>
                <Input
                    label="Street address"
                    placeholder="Street / building / landmark"
                    value={value.addressStreet1}
                    onChange={(v) => patch({ addressStreet1: v })}
                />
                <Input
                    label="Area / locality (optional)"
                    placeholder="Area, neighbourhood"
                    value={value.addressStreet2}
                    onChange={(v) => patch({ addressStreet2: v })}
                />
                <div className="grid grid-cols-2 gap-3">
                    <Input
                        label="City"
                        placeholder="Bengaluru"
                        value={value.addressCity}
                        onChange={(v) => patch({ addressCity: v })}
                    />
                    <Input
                        label="State"
                        placeholder="Karnataka"
                        value={value.addressState}
                        onChange={(v) => patch({ addressState: v })}
                    />
                </div>
                <Input
                    label="Postcode"
                    placeholder="560034"
                    value={value.addressPostcode}
                    onChange={(v) => patch({ addressPostcode: v })}
                />
            </div>

            {/* Contact */}
            <div className="flex flex-col gap-3">
                <p className="text-xs font-semibold uppercase tracking-wider text-quaternary">
                    Contact
                </p>
                <Input
                    label="Phone"
                    type="tel"
                    placeholder="9876543210"
                    value={value.phone}
                    onChange={(v) => patch({ phone: v })}
                />
                <Input
                    label="Email"
                    type="email"
                    placeholder="branch@hospital.com"
                    value={value.email}
                    onChange={(v) => patch({ email: v })}
                />
            </div>

            {/* Visiting hours — day pills + single time range */}
            <div className="flex flex-col gap-3">
                <p className="text-xs font-semibold uppercase tracking-wider text-quaternary">
                    Visiting hours
                </p>
                <DaySelector
                    label="Open days"
                    hint="Pick the days this clinic is open. The time range below applies to every selected day."
                    value={value.openDays}
                    onChange={(openDays) => patch({ openDays })}
                />
                <div className="grid grid-cols-2 gap-3">
                    <TimePicker
                        label="Opens at"
                        value={value.opensAt}
                        onChange={(opensAt) => patch({ opensAt })}
                    />
                    <TimePicker
                        label="Closes at"
                        value={value.closesAt}
                        onChange={(closesAt) => patch({ closesAt })}
                    />
                </div>
            </div>

            {/* Holiday closures */}
            <div className="flex flex-col gap-3">
                <p className="text-xs font-semibold uppercase tracking-wider text-quaternary">
                    Holiday closures (optional)
                </p>
                {value.holidays.length === 0 && (
                    <p className="text-xs text-tertiary">
                        No holidays configured. Add dates when this clinic is closed (Diwali,
                        Republic Day, maintenance days, etc.).
                    </p>
                )}
                {value.holidays.map((h, idx) => (
                    <div
                        key={idx}
                        className="flex items-end gap-2 rounded-lg border border-secondary bg-secondary p-3"
                    >
                        <div className="shrink-0">
                            <span className="mb-1 block text-xs font-medium text-secondary">
                                Date
                            </span>
                            <DatePicker
                                value={h.date ? parseDate(h.date) : null}
                                onChange={(dv: DateValue | null) =>
                                    updateHoliday(idx, { date: dv ? dv.toString() : '' })
                                }
                            />
                        </div>
                        <div className="flex-1">
                            <Input
                                label="Reason"
                                placeholder="e.g. Diwali"
                                value={h.label}
                                onChange={(label) => updateHoliday(idx, { label })}
                            />
                        </div>
                        <Button
                            size="sm"
                            color="tertiary-destructive"
                            iconLeading={({ className }: { className?: string }) => (
                                <FontAwesomeIcon icon={faTrash} className={className} />
                            )}
                            onClick={() => removeHoliday(idx)}
                        >
                            Remove
                        </Button>
                    </div>
                ))}
                <Button
                    size="sm"
                    color="secondary"
                    iconLeading={({ className }: { className?: string }) => (
                        <FontAwesomeIcon icon={faPlus} className={className} />
                    )}
                    onClick={addHoliday}
                    className="self-start"
                >
                    Add holiday
                </Button>
            </div>

            {/* Booking policy */}
            <div className="flex flex-col gap-3">
                <p className="text-xs font-semibold uppercase tracking-wider text-quaternary">
                    Booking policy
                </p>
                <div className="flex flex-col gap-3 rounded-lg border border-secondary bg-secondary p-4">
                    <Toggle
                        label="Walk-ins allowed"
                        isSelected={value.walkInAllowed}
                        onChange={(checked) => patch({ walkInAllowed: checked })}
                    />
                    <Toggle
                        label="Accept online bookings"
                        isSelected={value.onlineBooking}
                        onChange={(checked) => patch({ onlineBooking: checked })}
                    />
                </div>
                <div className="grid grid-cols-2 gap-3">
                    <Input
                        label="Cancel window (hours)"
                        type="number"
                        value={value.cancellationWindowHours}
                        onChange={(v) => patch({ cancellationWindowHours: v })}
                    />
                    <Input
                        label="Arrive early (min)"
                        type="number"
                        value={value.arriveEarlyMin}
                        onChange={(v) => patch({ arriveEarlyMin: v })}
                    />
                </div>
            </div>

            {/* Required documents — multi-select → pills */}
            <div className="flex flex-col gap-3">
                <p className="text-xs font-semibold uppercase tracking-wider text-quaternary">
                    Required documents (optional)
                </p>
                {availableDocTypes.length > 0 && (
                    <Select
                        label="Add a required document"
                        placeholder="Pick a document type..."
                        items={availableDocTypes}
                        selectedKey={null}
                        onSelectionChange={(key) => {
                            if (key) addDocType(key as DocumentType);
                        }}
                    >
                        {(item) => <Select.Item id={item.id} label={item.label} />}
                    </Select>
                )}
                {value.requiredDocumentTypes.length > 0 && (
                    <div className="flex flex-wrap gap-2">
                        {value.requiredDocumentTypes.map((t) => (
                            <button
                                key={t}
                                type="button"
                                onClick={() => removeDocType(t)}
                                className="group flex items-center gap-2 rounded-full border border-brand bg-brand-secondary px-3 py-1.5 text-sm font-medium text-brand-secondary transition hover:bg-brand-primary_hover"
                            >
                                {DOCUMENT_TYPE_LABELS[t]}
                                <FontAwesomeIcon
                                    icon={faTrash}
                                    className="size-3 text-fg-quaternary group-hover:text-fg-error-primary"
                                />
                            </button>
                        ))}
                    </div>
                )}
                {value.requiredDocumentTypes.length === 0 && (
                    <p className="text-xs text-tertiary">
                        No required documents. Patients won't be asked to bring anything.
                    </p>
                )}
            </div>
        </div>
    );
};