import { useEffect, useState } from 'react';
import { FontAwesomeIcon } from '@fortawesome/react-fontawesome';
import { faSparkles, faUser, faCalendarCheck } from '@fortawesome/pro-duotone-svg-icons';
import { faIcon } from '@/lib/icon-wrapper';
import { AiChatPanel } from './ai-chat-panel';
import { Badge } from '@/components/base/badges/badges';
import { apiClient } from '@/lib/api-client';
import { formatPhone, formatShortDate } from '@/lib/format';
import { cx } from '@/utils/cx';
import type { Lead, LeadActivity } from '@/types/entities';

const CalendarCheck = faIcon(faCalendarCheck);

type ContextTab = 'ai' | 'lead360';

interface ContextPanelProps {
    selectedLead: Lead | null;
    activities: LeadActivity[];
    callerPhone?: string;
    isInCall?: boolean;
    callUcid?: string | null;
}

export const ContextPanel = ({ selectedLead, activities, callerPhone }: ContextPanelProps) => {
    const [activeTab, setActiveTab] = useState<ContextTab>('ai');

    // Auto-switch to lead 360 when a lead is selected
    useEffect(() => {
        if (selectedLead) {
            setActiveTab('lead360');
        }
    }, [selectedLead?.id]);

    const callerContext = selectedLead ? {
        callerPhone: selectedLead.contactPhone?.[0]?.number ?? callerPhone,
        leadId: selectedLead.id,
        leadName: `${selectedLead.contactName?.firstName ?? ''} ${selectedLead.contactName?.lastName ?? ''}`.trim(),
    } : callerPhone ? { callerPhone } : undefined;

    return (
        <div className="flex h-full flex-col">
            {/* Tab bar */}
            <div className="flex shrink-0 border-b border-secondary">
                <button
                    onClick={() => setActiveTab('ai')}
                    className={cx(
                        "flex flex-1 items-center justify-center gap-1.5 px-3 py-2.5 text-xs font-semibold transition duration-100 ease-linear",
                        activeTab === 'ai'
                            ? "border-b-2 border-brand text-brand-secondary"
                            : "text-tertiary hover:text-secondary",
                    )}
                >
                    <FontAwesomeIcon icon={faSparkles} className="size-3.5" />
                    AI Assistant
                </button>
                <button
                    onClick={() => setActiveTab('lead360')}
                    className={cx(
                        "flex flex-1 items-center justify-center gap-1.5 px-3 py-2.5 text-xs font-semibold transition duration-100 ease-linear",
                        activeTab === 'lead360'
                            ? "border-b-2 border-brand text-brand-secondary"
                            : "text-tertiary hover:text-secondary",
                    )}
                >
                    <FontAwesomeIcon icon={faUser} className="size-3.5" />
                    {(selectedLead as any)?.patientId ? 'Patient 360' : 'Lead 360'}
                </button>
            </div>

            {/* Tab content */}
            {activeTab === 'ai' && (
                <div className="flex flex-1 flex-col overflow-hidden p-4">
                    <AiChatPanel callerContext={callerContext} />
                </div>
            )}
            {activeTab === 'lead360' && (
                <div className="flex-1 overflow-y-auto">
                    <Lead360Tab lead={selectedLead} activities={activities} />
                </div>
            )}
        </div>
    );
};

const Lead360Tab = ({ lead, activities }: { lead: Lead | null; activities: LeadActivity[] }) => {
    const [patientData, setPatientData] = useState<any>(null);
    const [loadingPatient, setLoadingPatient] = useState(false);

    // Fetch patient data when lead has a patientId (returning patient)
    useEffect(() => {
        const patientId = (lead as any)?.patientId;
        if (!patientId) {
            setPatientData(null);
            return;
        }

        setLoadingPatient(true);
        apiClient.graphql<{ patients: { edges: Array<{ node: any }> } }>(
            `query GetPatient($id: UUID!) { patients(filter: { id: { eq: $id } }) { edges { node {
                id fullName { firstName lastName } dateOfBirth gender patientType
                phones { primaryPhoneNumber } emails { primaryEmail }
                appointments(first: 5, orderBy: [{ scheduledAt: DescNullsLast }]) { edges { node {
                    id scheduledAt status doctorName department reasonForVisit appointmentType
                } } }
                calls(first: 5, orderBy: [{ startedAt: DescNullsLast }]) { edges { node {
                    id callStatus disposition direction startedAt durationSec agentName
                } } }
            } } } }`,
            { id: patientId },
            { silent: true },
        ).then(data => {
            setPatientData(data.patients.edges[0]?.node ?? null);
        }).catch(() => setPatientData(null))
        .finally(() => setLoadingPatient(false));
    }, [(lead as any)?.patientId]);

    if (!lead) {
        return (
            <div className="flex flex-col items-center justify-center py-16 text-center px-4">
                <FontAwesomeIcon icon={faUser} className="mb-3 size-8 text-fg-quaternary" />
                <p className="text-sm text-tertiary">Select a lead from the worklist to see their full profile.</p>
            </div>
        );
    }

    const firstName = lead.contactName?.firstName ?? '';
    const lastName = lead.contactName?.lastName ?? '';
    const fullName = `${firstName} ${lastName}`.trim() || 'Unknown';
    const phone = lead.contactPhone?.[0];
    const email = lead.contactEmail?.[0]?.address;

    const leadActivities = activities
        .filter((a) => a.leadId === lead.id)
        .sort((a, b) => new Date(b.occurredAt ?? b.createdAt ?? '').getTime() - new Date(a.occurredAt ?? a.createdAt ?? '').getTime())
        .slice(0, 10);

    const isReturning = !!patientData;
    const appointments = patientData?.appointments?.edges?.map((e: any) => e.node) ?? [];
    const patientCalls = patientData?.calls?.edges?.map((e: any) => e.node) ?? [];

    const patientAge = patientData?.dateOfBirth
        ? Math.floor((Date.now() - new Date(patientData.dateOfBirth).getTime()) / (365.25 * 24 * 60 * 60 * 1000))
        : null;
    const patientGender = patientData?.gender === 'MALE' ? 'M' : patientData?.gender === 'FEMALE' ? 'F' : null;

    return (
        <div className="p-4 space-y-4">
            {/* Profile */}
            <div>
                <h3 className="text-lg font-bold text-primary">{fullName}</h3>
                {phone && <p className="text-sm text-secondary">{formatPhone(phone)}</p>}
                {email && <p className="text-xs text-tertiary">{email}</p>}
                <div className="mt-2 flex flex-wrap gap-1.5">
                    {isReturning && (
                        <Badge size="sm" color="brand" type="pill-color">Returning Patient</Badge>
                    )}
                    {patientAge !== null && patientGender && (
                        <Badge size="sm" color="gray" type="pill-color">{patientAge}y · {patientGender}</Badge>
                    )}
                    {lead.leadStatus && <Badge size="sm" color="brand">{lead.leadStatus}</Badge>}
                    {lead.leadSource && <Badge size="sm" color="gray">{lead.leadSource}</Badge>}
                    {lead.priority && lead.priority !== 'NORMAL' && (
                        <Badge size="sm" color={lead.priority === 'URGENT' ? 'error' : 'warning'}>{lead.priority}</Badge>
                    )}
                </div>
                {lead.interestedService && (
                    <p className="mt-2 text-sm text-secondary">Interested in: {lead.interestedService}</p>
                )}
            </div>

            {/* Returning patient: Appointments */}
            {loadingPatient && (
                <p className="text-xs text-tertiary">Loading patient details...</p>
            )}
            {isReturning && appointments.length > 0 && (
                <div>
                    <h4 className="mb-2 text-xs font-bold text-secondary uppercase">Appointments</h4>
                    <div className="space-y-2">
                        {appointments.map((appt: any) => {
                            const statusColors: Record<string, 'success' | 'brand' | 'warning' | 'error' | 'gray'> = {
                                COMPLETED: 'success', SCHEDULED: 'brand', CONFIRMED: 'brand',
                                CANCELLED: 'error', NO_SHOW: 'warning',
                            };
                            return (
                                <div key={appt.id} className="flex items-start gap-2 rounded-lg bg-secondary p-2">
                                    <CalendarCheck className="mt-0.5 size-3.5 text-fg-brand-primary shrink-0" />
                                    <div className="min-w-0 flex-1">
                                        <div className="flex items-center gap-1.5">
                                            <span className="text-xs font-semibold text-primary">
                                                {appt.doctorName ?? 'Doctor'} · {appt.department ?? ''}
                                            </span>
                                            {appt.status && (
                                                <Badge size="sm" color={statusColors[appt.status] ?? 'gray'}>
                                                    {appt.status.toLowerCase()}
                                                </Badge>
                                            )}
                                        </div>
                                        <p className="text-[10px] text-quaternary">
                                            {appt.scheduledAt ? formatShortDate(appt.scheduledAt) : ''}
                                            {appt.reasonForVisit ? ` — ${appt.reasonForVisit}` : ''}
                                        </p>
                                    </div>
                                </div>
                            );
                        })}
                    </div>
                </div>
            )}

            {/* Returning patient: Recent calls */}
            {isReturning && patientCalls.length > 0 && (
                <div>
                    <h4 className="mb-2 text-xs font-bold text-secondary uppercase">Recent Calls</h4>
                    <div className="space-y-1">
                        {patientCalls.map((call: any) => (
                            <div key={call.id} className="flex items-center gap-2 text-xs">
                                <div className="mt-0.5 size-1.5 shrink-0 rounded-full bg-fg-quaternary" />
                                <span className="text-primary">
                                    {call.direction === 'INBOUND' ? 'Inbound' : 'Outbound'}
                                    {call.disposition ? ` — ${call.disposition.replace(/_/g, ' ').toLowerCase()}` : ''}
                                </span>
                                <span className="text-quaternary ml-auto">{call.startedAt ? formatShortDate(call.startedAt) : ''}</span>
                            </div>
                        ))}
                    </div>
                </div>
            )}

            {/* AI Insight */}
            {(lead.aiSummary || lead.aiSuggestedAction) && (
                <div className="rounded-lg bg-brand-primary p-3">
                    <div className="mb-1 flex items-center gap-1.5">
                        <FontAwesomeIcon icon={faSparkles} className="size-3 text-fg-brand-primary" />
                        <span className="text-[10px] font-bold uppercase tracking-wider text-brand-secondary">AI Insight</span>
                    </div>
                    {lead.aiSummary && <p className="text-xs text-primary">{lead.aiSummary}</p>}
                    {lead.aiSuggestedAction && (
                        <p className="mt-1 text-xs font-semibold text-brand-secondary">{lead.aiSuggestedAction}</p>
                    )}
                </div>
            )}

            {/* Activity timeline */}
            {leadActivities.length > 0 && (
                <div>
                    <h4 className="mb-2 text-xs font-bold text-secondary uppercase">Activity</h4>
                    <div className="space-y-2">
                        {leadActivities.map((a) => (
                            <div key={a.id} className="flex items-start gap-2">
                                <div className="mt-1.5 size-1.5 shrink-0 rounded-full bg-fg-quaternary" />
                                <div className="min-w-0 flex-1">
                                    <p className="text-xs text-primary">{a.summary}</p>
                                    <p className="text-[10px] text-quaternary">
                                        {a.activityType}{a.occurredAt ? ` · ${formatShortDate(a.occurredAt)}` : ''}
                                    </p>
                                </div>
                            </div>
                        ))}
                    </div>
                </div>
            )}
        </div>
    );
};
