'use client';

import { useEffect, useState } from 'react';
import { getAIAnalysis } from '@/lib/actions/stock-analysis.actions';
import type { StockAIAnalysis } from '@/lib/actions/stock-analysis.helpers';

interface StockAIAnalysisCardProps {
    symbol: string;
    companyName?: string | null;
}

function getStanceClasses(stance: StockAIAnalysis['stance']) {
    if (stance === 'Bullish') return 'border-emerald-500/30 bg-emerald-500/10 text-emerald-300';
    if (stance === 'Bearish') return 'border-rose-500/30 bg-rose-500/10 text-rose-300';
    return 'border-amber-500/30 bg-amber-500/10 text-amber-200';
}

function renderList(title: string, items: string[]) {
    return (
        <div className="rounded-xl border border-gray-800 bg-black/20 p-4">
            <h3 className="text-sm font-semibold uppercase tracking-[0.18em] text-gray-400">{title}</h3>
            {items.length ? (
                <ul className="mt-3 space-y-3">
                    {items.map((item) => (
                        <li key={item} className="flex gap-3 text-sm text-gray-200">
                            <span className="mt-2 h-1.5 w-1.5 rounded-full bg-yellow-400" />
                            <span>{item}</span>
                        </li>
                    ))}
                </ul>
            ) : (
                <p className="mt-3 text-sm text-gray-400">No additional signals generated.</p>
            )}
        </div>
    );
}

function LoadingSkeleton() {
    return (
        <section className="rounded-2xl border border-gray-800 bg-gray-950/40 p-5 backdrop-blur-sm">
            <div className="flex flex-col gap-4 animate-pulse">
                <div className="flex flex-col gap-3 md:flex-row md:items-start md:justify-between">
                    <div className="flex-1">
                        <div className="h-3 w-32 rounded bg-gray-700" />
                        <div className="mt-2 h-6 w-48 rounded bg-gray-700" />
                        <div className="mt-3 h-4 w-full rounded bg-gray-700" />
                        <div className="mt-2 h-4 w-3/4 rounded bg-gray-700" />
                    </div>
                    <div className="flex gap-2">
                        <div className="h-6 w-20 rounded-full bg-gray-700" />
                        <div className="h-6 w-28 rounded-full bg-gray-700" />
                    </div>
                </div>
                <div className="grid grid-cols-1 gap-4 md:grid-cols-3">
                    {[0, 1, 2].map((i) => (
                        <div key={i} className="rounded-xl border border-gray-800 bg-black/20 p-4">
                            <div className="h-3 w-20 rounded bg-gray-700" />
                            <div className="mt-3 space-y-3">
                                <div className="h-3 w-full rounded bg-gray-700" />
                                <div className="h-3 w-5/6 rounded bg-gray-700" />
                            </div>
                        </div>
                    ))}
                </div>
                <div className="h-3 w-72 rounded bg-gray-700" />
            </div>
        </section>
    );
}

function ErrorState() {
    return (
        <section className="rounded-2xl border border-gray-800 bg-gray-950/40 p-5 backdrop-blur-sm">
            <p className="text-xs font-semibold uppercase tracking-[0.22em] text-gray-500">AI Stock Analysis</p>
            <h2 className="mt-2 text-xl font-semibold text-white">Professional research note unavailable</h2>
            <p className="mt-3 text-sm leading-6 text-gray-400">
                The stock dashboard data loaded, but an AI research note could not be generated right now.
            </p>
        </section>
    );
}

export default function StockAIAnalysisCard({ symbol, companyName }: StockAIAnalysisCardProps) {
    const [analysis, setAnalysis] = useState<StockAIAnalysis | null>(null);
    const [isLoading, setIsLoading] = useState(true);

    useEffect(() => {
        let cancelled = false;

        async function fetchAnalysis() {
            try {
                const result = await getAIAnalysis(symbol, companyName);
                if (!cancelled) {
                    setAnalysis(result);
                }
            } catch {
                if (!cancelled) {
                    setAnalysis(null);
                }
            } finally {
                if (!cancelled) {
                    setIsLoading(false);
                }
            }
        }

        fetchAnalysis();

        return () => {
            cancelled = true;
        };
    }, [symbol, companyName]);

    if (isLoading) {
        return <LoadingSkeleton />;
    }

    if (!analysis) {
        return <ErrorState />;
    }

    return (
        <section className="rounded-2xl border border-gray-800 bg-gray-950/40 p-5 backdrop-blur-sm">
            <div className="flex flex-col gap-4">
                <div className="flex flex-col gap-3 md:flex-row md:items-start md:justify-between">
                    <div>
                        <p className="text-xs font-semibold uppercase tracking-[0.22em] text-gray-500">
                            AI Stock Analysis
                        </p>
                        <h2 className="mt-2 text-xl font-semibold text-white">
                            {analysis.companyName ? `${analysis.companyName} (${analysis.symbol})` : analysis.symbol}
                        </h2>
                        <p className="mt-2 text-sm leading-6 text-gray-300">{analysis.summary}</p>
                    </div>

                    <div className="flex flex-wrap gap-2">
                        <span
                            className={`rounded-full border px-3 py-1 text-xs font-semibold uppercase tracking-[0.18em] ${getStanceClasses(analysis.stance)}`}
                        >
                            {analysis.stance}
                        </span>
                        <span className="rounded-full border border-gray-700 bg-black/20 px-3 py-1 text-xs font-semibold uppercase tracking-[0.18em] text-gray-200">
                            {analysis.confidence} confidence
                        </span>
                    </div>
                </div>

                <div className="grid grid-cols-1 gap-4 md:grid-cols-3">
                    {renderList('Key drivers', analysis.keyDrivers)}
                    {renderList('Risks', analysis.risks)}
                    {renderList('What to watch', analysis.watchItems)}
                </div>

                <p className="text-xs text-gray-500">
                    Educational analysis only. Use it as a synthesis of the dashboard inputs, not as personal
                    financial advice.
                </p>
            </div>
        </section>
    );
}