import { useState, type ReactNode } from 'react';
import { REGEXP_ONLY_DIGITS } from 'input-otp';
import { Button } from '@/components/base/buttons/button';
import { Dialog, Modal, ModalOverlay } from '@/components/application/modals/modal';
import { PinInput } from '@/components/base/pin-input/pin-input';
import { FeaturedIcon } from '@/components/foundations/featured-icon/featured-icon';
import { FontAwesomeIcon } from '@fortawesome/react-fontawesome';
import { faShieldKeyhole } from '@fortawesome/pro-duotone-svg-icons';
import type { FC } from 'react';
import { notify } from '@/lib/toast';

const ShieldIcon: FC<{ className?: string }> = ({ className }) => (
    <FontAwesomeIcon icon={faShieldKeyhole} className={className} />
);

const API_URL = import.meta.env.VITE_API_URL ?? 'http://localhost:4100';

type MaintAction = {
    endpoint: string;
    label: string;
    description: string;
    needsPreStep?: boolean;
    clientSideHandler?: (payload: any) => Promise<{ status: string; message: string }>;
};

type MaintOtpModalProps = {
    isOpen: boolean;
    onOpenChange: (open: boolean) => void;
    action: MaintAction | null;
    preStepContent?: ReactNode;
    preStepPayload?: Record<string, any>;
    preStepReady?: boolean;
};

export const MaintOtpModal = ({ isOpen, onOpenChange, action, preStepContent, preStepPayload, preStepReady = true }: MaintOtpModalProps) => {
    const [otp, setOtp] = useState('');
    const [loading, setLoading] = useState(false);
    const [error, setError] = useState<string | null>(null);

    const handleSubmit = async () => {
        if (!action || otp.length < 6) return;
        setLoading(true);
        setError(null);

        try {
            if (action.clientSideHandler) {
                // Client-side action — OTP verified by calling a dummy maint endpoint first
                const otpRes = await fetch(`${API_URL}/api/maint/force-ready`, {
                    method: 'POST',
                    headers: { 'Content-Type': 'application/json', 'x-maint-otp': otp },
                });
                if (!otpRes.ok) {
                    setError('Invalid maintenance code');
                    setLoading(false);
                    return;
                }
                const result = await action.clientSideHandler(preStepPayload);
                notify.success(action.label, result.message ?? 'Completed');
                onOpenChange(false);
                setOtp('');
            } else {
                // Standard sidecar endpoint
                const res = await fetch(`${API_URL}/api/maint/${action.endpoint}`, {
                    method: 'POST',
                    headers: {
                        'Content-Type': 'application/json',
                        'x-maint-otp': otp,
                    },
                    ...(preStepPayload ? { body: JSON.stringify(preStepPayload) } : {}),
                });
                const data = await res.json();
                if (res.ok) {
                    console.log(`[MAINT] ${action.label}:`, data);
                    notify.success(action.label, data.message ?? 'Completed successfully');
                    onOpenChange(false);
                    setOtp('');
                } else {
                    setError(data.message ?? 'Failed');
                }
            }
        } catch {
            setError('Request failed');
        } finally {
            setLoading(false);
        }
    };

    const handleOtpChange = (value: string) => {
        setOtp(value);
        setError(null);
    };

    const handleClose = () => {
        onOpenChange(false);
        setOtp('');
        setError(null);
    };

    if (!action) return null;

    const showOtp = !action.needsPreStep || preStepReady;

    return (
        <ModalOverlay isOpen={isOpen} onOpenChange={handleClose} isDismissable>
            <Modal className="sm:max-w-[400px]">
                <Dialog>
                    {() => (
                        <div className="flex w-full flex-col rounded-xl bg-primary shadow-xl ring-1 ring-secondary overflow-hidden">
                            {/* Header */}
                            <div className="flex flex-col items-center gap-4 px-6 pt-6 pb-5">
                                <FeaturedIcon icon={ShieldIcon} color="brand" theme="light" size="md" />
                                <div className="flex flex-col items-center gap-1 text-center">
                                    <h2 className="text-lg font-semibold text-primary">{action.label}</h2>
                                    <p className="text-sm text-tertiary">{action.description}</p>
                                </div>
                            </div>

                            {/* Pre-step content (e.g., campaign selection) */}
                            {action.needsPreStep && preStepContent && (
                                <div className="px-6 pb-4">
                                    {preStepContent}
                                </div>
                            )}

                            {/* Pin Input — shown when pre-step is ready (or no pre-step needed) */}
                            {showOtp && (
                                <div className="flex flex-col items-center gap-2 px-6 pb-5">
                                    <PinInput size="sm">
                                        <PinInput.Label>Enter maintenance code</PinInput.Label>
                                        <PinInput.Group
                                            maxLength={6}
                                            pattern={REGEXP_ONLY_DIGITS}
                                            value={otp}
                                            onChange={handleOtpChange}
                                            onComplete={handleSubmit}
                                            containerClassName="flex flex-row gap-2 h-14"
                                        >
                                            <PinInput.Slot index={0} className="!size-12 !text-display-sm" />
                                            <PinInput.Slot index={1} className="!size-12 !text-display-sm" />
                                            <PinInput.Slot index={2} className="!size-12 !text-display-sm" />
                                            <PinInput.Separator />
                                            <PinInput.Slot index={3} className="!size-12 !text-display-sm" />
                                            <PinInput.Slot index={4} className="!size-12 !text-display-sm" />
                                            <PinInput.Slot index={5} className="!size-12 !text-display-sm" />
                                        </PinInput.Group>
                                    </PinInput>
                                    {error && (
                                        <p className="text-sm text-error-primary mt-1">{error}</p>
                                    )}
                                </div>
                            )}

                            {/* Footer */}
                            <div className="flex items-center gap-3 border-t border-secondary px-6 py-4">
                                <Button size="md" color="secondary" onClick={handleClose} className="flex-1">
                                    Cancel
                                </Button>
                                <Button
                                    size="md"
                                    color="primary"
                                    isDisabled={otp.length < 6 || loading || (action.needsPreStep && !preStepReady)}
                                    isLoading={loading}
                                    onClick={handleSubmit}
                                    className="flex-1"
                                >
                                    Confirm
                                </Button>
                            </div>
                        </div>
                    )}
                </Dialog>
            </Modal>
        </ModalOverlay>
    );
};