'use client';

import { useEffect, useState } from 'react';
import { useRouter, useParams } from 'next/navigation';
import type { FirmConfig } from '@/types';

/**
 * Read-only view of one firm's account types and banned symbols.
 *
 * Both are owned by the master dashboard now. This page renders from the local
 * catalog cache rather than linking straight out to the master, because the
 * moment you most want to know what an account type says is the moment the
 * master is unreachable.
 */

function fmtSize(n: number) {
    return n >= 1000 ? `${n / 1000}k` : String(n);
}

function fmtMoney(n: number) {
    return `$${n.toLocaleString(undefined, { maximumFractionDigits: 2 })}`;
}

export default function FirmSettingsPage() {
    const router = useRouter();
    const params = useParams();
    const id = params.id as string;

    const [firm, setFirm] = useState<FirmConfig | null>(null);
    const [masterUrl, setMasterUrl] = useState<string | null>(null);
    const [loadError, setLoadError] = useState('');

    useEffect(() => {
        fetch(`/api/firms/${id}`)
            .then((r) => {
                if (!r.ok) throw new Error('Not found');
                return r.json() as Promise<FirmConfig>;
            })
            .then(setFirm)
            .catch(() => setLoadError('Failed to load firm'));

        fetch('/api/firm-catalog')
            .then((r) => r.json())
            .then((meta: { masterUrl?: string | null }) => setMasterUrl(meta.masterUrl ?? null))
            .catch(() => {});
    }, [id]);

    if (loadError) {
        return (
            <div className="min-h-screen bg-slate-50 p-8">
                <div className="max-w-7xl mx-auto">
                    <p className="text-sm text-red-600">{loadError}</p>
                </div>
            </div>
        );
    }

    const firmsPageUrl = masterUrl ? new URL('/firms', masterUrl).toString() : null;

    return (
        <div className="min-h-screen bg-slate-50 p-8">
            <div className="max-w-7xl mx-auto">

                <div className="flex items-center gap-3 mb-6">
                    <button
                        onClick={() => router.push('/')}
                        className="text-slate-400 hover:text-slate-600 text-sm transition-colors"
                    >
                        ← Back
                    </button>
                    <h1 className="text-2xl font-bold text-slate-900">{firm?.firm ?? '…'}</h1>
                    <span className="text-slate-300 text-2xl font-light">/</span>
                    <span className="text-2xl font-bold text-slate-400">Account Types</span>
                </div>

                <div className="mb-4 rounded-lg border border-slate-200 bg-white px-4 py-3 text-sm text-slate-600 shadow-sm">
                    Account types and banned symbols are managed on the master dashboard and pulled from it — this is a
                    read-only copy of the last successful sync.
                    {firmsPageUrl && (
                        <>
                            {' '}
                            <a
                                href={firmsPageUrl}
                                target="_blank"
                                rel="noreferrer"
                                className="text-blue-600 hover:text-blue-700 font-medium"
                            >
                                Edit on master →
                            </a>
                        </>
                    )}
                </div>

                <div className="bg-white border border-slate-200 rounded-xl overflow-hidden shadow-sm">
                    <table className="w-full text-sm border-collapse">
                        <thead>
                            <tr className="border-b border-slate-200 bg-slate-50">
                                {['Label', 'Prefix', 'Account Size', 'Profit Target', 'Consistency', 'Min Day P&L', 'Min Trading Days', 'Max Contracts', 'After First W/D'].map((h) => (
                                    <th key={h} className="px-4 py-3 text-left text-xs font-semibold uppercase tracking-wider text-slate-400">{h}</th>
                                ))}
                            </tr>
                        </thead>
                        <tbody>
                            {firm && firm.accounts.length === 0 && (
                                <tr>
                                    <td colSpan={9} className="px-4 py-6 text-center text-sm text-slate-400 italic">
                                        No account types — add them on the master dashboard
                                    </td>
                                </tr>
                            )}

                            {firm?.accounts.map((acc) => (
                                <tr key={acc.id} className="border-b border-slate-100 last:border-0">
                                    <td className="px-4 py-2.5 font-medium text-slate-800">{acc.label}</td>
                                    <td className="px-4 py-2.5 font-mono text-slate-700">{acc.prefix}</td>
                                    <td className="px-4 py-2.5 text-slate-600 tabular-nums">{fmtSize(acc.accountSize)}</td>
                                    <td className="px-4 py-2.5 text-slate-600 tabular-nums">{fmtMoney(acc.profitTarget)}</td>
                                    <td className="px-4 py-2.5 text-slate-600 tabular-nums">{Math.round(acc.consistency * 100)}%</td>
                                    <td className="px-4 py-2.5 text-slate-600 tabular-nums">
                                        {acc.minDayPnL <= -999 ? '—' : fmtMoney(acc.minDayPnL)}
                                    </td>
                                    <td className="px-4 py-2.5 text-slate-600 tabular-nums">{acc.minTradingDays}</td>
                                    <td className="px-4 py-2.5 text-slate-600 tabular-nums">
                                        {acc.maxPositionSize === 0 ? 'No limit' : acc.maxPositionSize}
                                    </td>
                                    <td className="px-4 py-2.5 text-slate-600">
                                        {acc.targetSameEquity
                                            ? 'Same equity'
                                            : acc.withdrawalStages.length === 0
                                                ? 'Base values'
                                                : `${acc.withdrawalStages.length} stage${acc.withdrawalStages.length === 1 ? '' : 's'}`}
                                    </td>
                                </tr>
                            ))}
                        </tbody>
                    </table>
                </div>

                <h2 className="text-sm font-semibold uppercase tracking-wider text-slate-500 mt-10 mb-3">
                    Banned Symbols
                </h2>
                <div className="bg-white border border-slate-200 rounded-xl p-4 shadow-sm">
                    {!firm || firm.bannedSymbols.length === 0 ? (
                        <span className="text-sm text-slate-400 italic">None</span>
                    ) : (
                        <div className="flex flex-wrap gap-1.5">
                            {firm.bannedSymbols.map((sym) => (
                                <span key={sym} className="px-2 py-1 rounded-md text-xs font-mono font-semibold bg-red-100 text-red-700">
                                    {sym}
                                </span>
                            ))}
                        </div>
                    )}
                </div>

            </div>
        </div>
    );
}