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

type ContextTab = 'ai' | 'lead360';

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

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" />
                    Lead 360
                </button>
            </div>

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

const Lead360Tab = ({ lead, activities }: { lead: Lead | null; activities: LeadActivity[] }) => {
    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);

    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">
                    {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>
                )}
                {lead.leadScore !== null && lead.leadScore !== undefined && (
                    <p className="text-xs text-tertiary">Lead score: {lead.leadScore}</p>
                )}
            </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>
    );
};