import { useMemo } from 'react';
import { FontAwesomeIcon } from '@fortawesome/react-fontawesome';
import { faPhone, faPhoneArrowDown, faCircleCheck, faEnvelope, faClock, faStars } from '@fortawesome/pro-duotone-svg-icons';
import { Avatar } from '@/components/base/avatar/avatar';
import { Badge } from '@/components/base/badges/badges';
import { SourceTag } from '@/components/shared/source-tag';
import { AgeIndicator } from '@/components/shared/age-indicator';
import { DispositionForm } from './disposition-form';
import { formatPhone, formatShortDate, getInitials } from '@/lib/format';
import type { Lead, LeadActivity, CallDisposition, Campaign } from '@/types/entities';

type CallState = 'idle' | 'ringing' | 'active' | 'completed';

interface IncomingCallCardProps {
    callState: CallState;
    lead: Lead | null;
    activities: LeadActivity[];
    campaigns: Campaign[];
    onDisposition: (disposition: CallDisposition, notes: string) => void;
    completedDisposition?: CallDisposition | null;
}

const activityTypeIcons: Record<string, string> = {
    CALL_MADE: 'phone',
    CALL_RECEIVED: 'phone',
    WHATSAPP_SENT: 'message',
    WHATSAPP_RECEIVED: 'message',
    SMS_SENT: 'message',
    EMAIL_SENT: 'email',
    EMAIL_RECEIVED: 'email',
    NOTE_ADDED: 'note',
    ASSIGNED: 'assign',
    STATUS_CHANGE: 'status',
    APPOINTMENT_BOOKED: 'calendar',
    FOLLOW_UP_CREATED: 'clock',
    CONVERTED: 'check',
    MARKED_SPAM: 'alert',
    DUPLICATE_DETECTED: 'alert',
};

const ActivityIcon = ({ type }: { type: string }) => {
    const iconType = activityTypeIcons[type] ?? 'note';
    const baseClass = 'size-3.5 shrink-0 text-fg-quaternary';

    if (iconType === 'phone') return <FontAwesomeIcon icon={faPhone} className={baseClass} />;
    if (iconType === 'email') return <FontAwesomeIcon icon={faEnvelope} className={baseClass} />;
    if (iconType === 'clock') return <FontAwesomeIcon icon={faClock} className={baseClass} />;
    if (iconType === 'check') return <FontAwesomeIcon icon={faCircleCheck} className={baseClass} />;
    return <FontAwesomeIcon icon={faClock} className={baseClass} />;
};

const dispositionLabels: Record<CallDisposition, string> = {
    APPOINTMENT_BOOKED: 'Appointment Booked',
    FOLLOW_UP_SCHEDULED: 'Follow-up Needed',
    INFO_PROVIDED: 'Info Provided',
    NO_ANSWER: 'No Answer',
    WRONG_NUMBER: 'Wrong Number',
    CALLBACK_REQUESTED: 'Not Interested',
};

export const IncomingCallCard = ({ callState, lead, activities, campaigns, onDisposition, completedDisposition }: IncomingCallCardProps) => {
    if (callState === 'idle') {
        return <IdleState />;
    }

    if (callState === 'ringing') {
        return <RingingState lead={lead} />;
    }

    if (callState === 'active' && lead !== null) {
        return <ActiveState lead={lead} activities={activities} campaigns={campaigns} onDisposition={onDisposition} />;
    }

    if (callState === 'completed') {
        return <CompletedState disposition={completedDisposition ?? null} />;
    }

    return null;
};

const IdleState = () => (
    <div className="flex flex-col items-center justify-center rounded-2xl border border-secondary bg-secondary p-12 text-center">
        <div className="mb-4 animate-pulse">
            <FontAwesomeIcon icon={faPhone} className="size-12 text-fg-quaternary" />
        </div>
        <p className="text-lg text-tertiary">Waiting for incoming call...</p>
    </div>
);

const RingingState = ({ lead }: { lead: Lead | null }) => {
    const phoneDisplay = lead?.contactPhone?.[0]
        ? formatPhone(lead.contactPhone[0])
        : '+91 98765 43210';

    return (
        <div className="flex flex-col items-center justify-center rounded-2xl bg-brand-primary p-12 text-center">
            <div className="relative mb-4">
                <div className="absolute inset-0 animate-ping rounded-full bg-brand-solid opacity-20" />
                <div className="relative animate-bounce">
                    <FontAwesomeIcon icon={faPhoneArrowDown} className="size-12 text-fg-brand-primary" />
                </div>
            </div>
            <span className="mb-1 text-xs font-bold uppercase tracking-wider text-brand-secondary">
                Incoming Call
            </span>
            <span className="text-display-xs font-bold text-primary">
                {phoneDisplay}
            </span>
        </div>
    );
};

const ActiveState = ({
    lead,
    activities,
    campaigns,
    onDisposition,
}: {
    lead: Lead;
    activities: LeadActivity[];
    campaigns: Campaign[];
    onDisposition: (disposition: CallDisposition, notes: string) => void;
}) => {
    const leadActivities = useMemo(
        () =>
            activities
                .filter((a) => a.leadId === lead.id)
                .sort((a, b) => {
                    const dateA = a.occurredAt ?? a.createdAt ?? '';
                    const dateB = b.occurredAt ?? b.createdAt ?? '';
                    return new Date(dateB).getTime() - new Date(dateA).getTime();
                })
                .slice(0, 3),
        [activities, lead.id],
    );

    const campaignName = useMemo(() => {
        if (lead.campaignId === null) return null;
        const campaign = campaigns.find((c) => c.id === lead.campaignId);
        return campaign?.campaignName ?? null;
    }, [campaigns, lead.campaignId]);

    const firstName = lead.contactName?.firstName ?? '';
    const lastName = lead.contactName?.lastName ?? '';
    const fullName = `${firstName} ${lastName}`.trim() || 'Unknown Lead';
    const initials = firstName && lastName ? getInitials(firstName, lastName) : 'UL';
    const phoneDisplay = lead.contactPhone?.[0]
        ? formatPhone(lead.contactPhone[0])
        : 'No phone';
    const emailDisplay = lead.contactEmail?.[0]?.address ?? null;

    return (
        <div className="rounded-2xl border border-secondary bg-primary shadow-lg">
            <div className="flex flex-col gap-6 p-6 lg:flex-row">
                {/* Left section: lead details */}
                <div className="min-w-0 flex-1">
                    <div className="flex items-start gap-4">
                        <Avatar size="xl" initials={initials} />
                        <div className="min-w-0 flex-1">
                            <h3 className="text-lg font-bold text-primary">{fullName}</h3>
                            <div className="mt-1 flex items-center gap-1.5">
                                <FontAwesomeIcon icon={faPhone} className="size-3.5 shrink-0 text-fg-quaternary" />
                                <span className="text-md text-secondary">{phoneDisplay}</span>
                            </div>
                            {emailDisplay !== null && (
                                <div className="mt-0.5 flex items-center gap-1.5">
                                    <FontAwesomeIcon icon={faEnvelope} className="size-3.5 shrink-0 text-fg-quaternary" />
                                    <span className="text-sm text-tertiary">{emailDisplay}</span>
                                </div>
                            )}
                            <div className="mt-2 flex flex-wrap items-center gap-2">
                                {lead.leadSource !== null && (
                                    <SourceTag source={lead.leadSource} size="sm" />
                                )}
                                {campaignName !== null && (
                                    <Badge size="sm" color="brand">{campaignName}</Badge>
                                )}
                            </div>
                            {lead.interestedService !== null && (
                                <p className="mt-1.5 text-sm text-secondary">
                                    Interested in: {lead.interestedService}
                                </p>
                            )}
                            {lead.createdAt !== null && (
                                <div className="mt-1 flex items-center gap-1.5 text-sm text-tertiary">
                                    <span>Lead age:</span>
                                    <AgeIndicator dateStr={lead.createdAt} />
                                </div>
                            )}
                        </div>
                    </div>

                    {/* AI Insight panel */}
                    <div className="mt-4 rounded-xl bg-brand-primary p-4">
                        <div className="mb-2 flex items-center gap-1.5">
                            <FontAwesomeIcon icon={faStars} className="size-4 text-fg-brand-primary" />
                            <span className="text-xs font-bold uppercase tracking-wider text-brand-secondary">
                                AI Insight
                            </span>
                        </div>
                        {lead.aiSummary !== null ? (
                            <>
                                <p className="text-sm text-primary">{lead.aiSummary}</p>
                                {lead.aiSuggestedAction !== null && (
                                    <span className="mt-2 inline-block rounded-lg bg-brand-solid px-3 py-1.5 text-xs font-semibold text-white">
                                        {lead.aiSuggestedAction}
                                    </span>
                                )}
                            </>
                        ) : (
                            <p className="text-sm text-quaternary">
                                No AI insights available for this lead
                            </p>
                        )}
                    </div>

                    {/* Previous interactions */}
                    <div className="mt-4">
                        <h4 className="mb-2 text-sm font-bold text-primary">Recent Activity</h4>
                        {leadActivities.length > 0 ? (
                            <div className="flex flex-col gap-2">
                                {leadActivities.map((activity) => (
                                    <div key={activity.id} className="flex items-start gap-2">
                                        <ActivityIcon type={activity.activityType ?? 'NOTE_ADDED'} />
                                        <span className="flex-1 text-xs text-secondary">
                                            {activity.summary}
                                        </span>
                                        <span className="shrink-0 text-xs text-quaternary">
                                            {activity.occurredAt !== null
                                                ? formatShortDate(activity.occurredAt)
                                                : ''}
                                        </span>
                                    </div>
                                ))}
                            </div>
                        ) : (
                            <p className="text-xs text-quaternary">No previous interactions</p>
                        )}
                    </div>
                </div>

                {/* Right section: disposition form */}
                <div className="w-full shrink-0 border-t border-secondary pt-4 lg:w-72 lg:border-l lg:border-t-0 lg:pl-6 lg:pt-0">
                    <DispositionForm onSubmit={onDisposition} />
                </div>
            </div>
        </div>
    );
};

const CompletedState = ({ disposition }: { disposition: CallDisposition | null }) => {
    const label = disposition !== null ? dispositionLabels[disposition] : 'Unknown';

    return (
        <div className="flex flex-col items-center justify-center rounded-2xl bg-success-primary p-8 text-center">
            <FontAwesomeIcon icon={faCircleCheck} className="mb-3 size-12 text-fg-success-primary" />
            <h3 className="text-lg font-bold text-success-primary">Call Logged</h3>
            {disposition !== null && (
                <Badge size="md" color="success" className="mt-2">{label}</Badge>
            )}
            <p className="mt-2 text-sm text-tertiary">Returning to call desk...</p>
        </div>
    );
};