/* ── helpers ─────────────────────────────────────────────────────── */

export const formatNumber = (value) => {
    if (value === null || value === undefined || value === '') return '-';
    const numeric = Number(value);
    if (Number.isNaN(numeric)) return value;
    return new Intl.NumberFormat('ko-KR').format(numeric);
};

export const formatPercent = (value) => {
    if (value === null || value === undefined || value === '') return '-';
    if (typeof value === 'string' && value.includes('%')) return value;
    const numeric = Number(value);
    if (Number.isNaN(numeric)) return value;
    return `${numeric >= 0 ? '+' : ''}${numeric.toFixed(2)}%`;
};

export const pickFirst = (...values) =>
    values.find((value) => value !== undefined && value !== null && value !== '');

export const getQty = (item) =>
    pickFirst(item?.qty, item?.quantity, item?.holding, item?.hold_qty);

export const getBuyPrice = (item) =>
    pickFirst(
        item?.buy_price,
        item?.avg_price,
        item?.avg,
        item?.purchase_price,
        item?.buyPrice,
        item?.price
    );

export const getCurrentPrice = (item) =>
    pickFirst(
        item?.current_price,
        item?.current,
        item?.cur_price,
        item?.now_price,
        item?.market_price
    );

export const getProfitRate = (item) =>
    pickFirst(
        item?.profit_rate,
        item?.profitRate,
        item?.profit_pct,
        item?.profitPercent,
        item?.pnl_rate,
        item?.return_rate,
        item?.yield
    );

export const getProfitLoss = (item) =>
    pickFirst(item?.profit_loss, item?.pnl, item?.profitLoss);

export const toNumeric = (value) => {
    if (value === null || value === undefined || value === '') return null;
    const numeric = Number(String(value).replace(/[^0-9.-]/g, ''));
    return Number.isNaN(numeric) ? null : numeric;
};

/* ── Chart colors ──────────────────────────────────────────────── */

export const CHART_COLORS = ['#818cf8', '#fbbf24', '#34d399', '#f472b6', '#fb923c', '#a78bfa', '#38bdf8', '#4ade80'];

export const profitColorClass = (numericValue) => {
    if (numericValue > 0) return 'is-up';
    if (numericValue < 0) return 'is-down';
    if (numericValue === 0) return 'is-flat';
    return '';
};

export const numFitClass = (text) => {
    const len = String(text ?? '').length;
    if (len >= 13) return 'is-fit-xs';
    if (len >= 10) return 'is-fit-sm';
    return '';
};

export const getVixLabel = (vix) => {
    if (vix < 12) return '극히 낮음 (안일 주의)';
    if (vix < 20) return '정상 (안정적)';
    if (vix < 30) return '주의 (불확실성 증가)';
    if (vix < 40) return '높음 (극도의 공포)';
    return '극단 (패닉)';
};

export const getFgLabel = (score) => {
    if (score <= 25) return '극단적 공포';
    if (score <= 45) return '공포';
    if (score <= 55) return '중립';
    if (score <= 75) return '탐욕';
    return '극단적 탐욕';
};

/* ── empty portfolio form ────────────────────────────────────────── */

export const emptyPortfolioForm = {
    broker: '',
    ticker: '',
    name: '',
    quantity: '',
    avg_price: '',
    purchase_price: '',
};

/* ── empty sell-history form ─────────────────────────────────────── */

export const toLocalDatetimeValue = (isoStr) => {
    if (!isoStr) return '';
    const d = new Date(isoStr);
    const pad = (n) => String(n).padStart(2, '0');
    return `${d.getFullYear()}-${pad(d.getMonth() + 1)}-${pad(d.getDate())}T${pad(d.getHours())}:${pad(d.getMinutes())}`;
};

export const emptySellForm = () => ({
    broker: '',
    ticker: '',
    name: '',
    quantity: '',
    avg_price: '',
    sell_price: '',
    commission: '',
    sold_at: toLocalDatetimeValue(new Date().toISOString()),
});

/* ── 증권사별 요약 집계 ──────────────────────────────────────────── */
// totalBuy: 총 매입 = 각 종목 매입가(purchase_price)의 단순 합 (수량 미곱산, 박재오 정의).
//           매입가 미설정 시 avg_price 폴백. 백엔드 total_buy(×수량)는 표시에 쓰지 않음.
// totalCostBasis: 손익 계산용 매입원가 = SUM(avg_price × quantity) — 손익은 수량 곱산 유지.
export const computeBrokerSummary = (items) => {
    let totalBuy = 0, totalCostBasis = 0, totalEval = 0, hasNullPrice = false;
    for (const item of items) {
        const qty = item.quantity ?? 0;
        const purchase = item.purchase_price ?? item.avg_price ?? 0;
        totalBuy += purchase;
        totalCostBasis += (item.avg_price ?? 0) * qty;
        if (item.eval_amount != null) totalEval += item.eval_amount;
        else hasNullPrice = true;
    }
    const totalProfit = totalEval - totalCostBasis;
    const totalProfitRate = totalCostBasis > 0 ? (totalProfit / totalCostBasis) * 100 : 0;
    return { totalBuy, totalEval, totalProfit, totalProfitRate, hasNullPrice };
};

/* ── TAB IDs ─────────────────────────────────────────────────────── */

export const TAB_PORTFOLIO = 'portfolio';
export const TAB_REPORT = 'report';
export const TAB_ADVISOR = 'advisor';