import { NextResponse } from 'next/server';
import { getFirms, loadDailyPnL } from '@/lib/db';
import { getClients } from '@/lib/clients';
import { computeDailyTarget, resolveEffectiveConfig } from '@/lib/trading-logic';
import type { AccountConfigRow } from '@/lib/db';

function getAccountConfig(name: string, accounts: AccountConfigRow[]): AccountConfigRow | undefined {
    return [...accounts]
        .sort((a, b) => b.prefix.length - a.prefix.length)
        .find((a) => name.startsWith(a.prefix));
}

export async function GET() {
    try {
        const firms = getFirms();
        const clients = getClients();

        const state = firms.map((f) => {
            const client = clients.get(f.id);
            if (!client || client.accountList.length === 0) {
                return { firm: f.name, connected: false, accounts: [] };
            }
            const accounts = client.accountList.map((acc) => {
                const cash = client.accountCashBalances[acc.id] ?? { amount: 0, realizedPnL: 0 };
                const dailyPnL: { date: string; pnl: number }[] = client.dailyPnL[acc.id] ?? [];
                const totalProfit = dailyPnL.reduce((sum, d) => sum + d.pnl, 0);

                // Compute daily target and targetHit in one place — the single source of truth.
                const cfg = getAccountConfig(acc.name, f.accounts);
                // Days traded counts only days that hit minDayPnL (when set) — that's what
                // the firm requires toward the min trading day rule.
                const daysTraded: number = cfg && cfg.min_day_pnl > 0
                    ? dailyPnL.filter((d) => d.pnl >= cfg.min_day_pnl).length
                    : (client.daysTraded[acc.id] ?? 0);
                const autoLiqThreshold = client.autoLiqThresholds[acc.id] ?? 0;
                const isDead = autoLiqThreshold > 0 && cash.amount <= autoLiqThreshold;
                const allFundTxns = client.fundTransactions?.[acc.id] ?? [];
                const priorProfit = client.priorProfit?.[acc.id] ?? 0;
                // Stage = 1 + number of withdrawals (negative fund transactions)
                const stage = 1 + allFundTxns.filter((f) => f.amount < 0).length;
                // Hide initial funding (amount === accountSize) from display
                const displayFundTxns = cfg
                    ? allFundTxns.filter((f) => f.amount !== cfg.account_size)
                    : allFundTxns;
                let targetHit = false;
                let dailyTarget: { amount: number; path: 'first_day' | 'normal_day' | 'reduced_day' } | null = null;
                let effectiveProfitTarget: number | null = null;
                if (cfg && !isDead) {
                    const withdrawalStages: { profit: number; consistency: number; minTradingDays: number }[] = (() => { try { return JSON.parse(cfg.withdrawal_stages ?? '[]'); } catch { return []; } })();
                    const effective = resolveEffectiveConfig(
                        cfg.profit_target,
                        cfg.consistency,
                        cfg.min_trading_days,
                        cfg.target_same_equity === 1,
                        withdrawalStages,
                        priorProfit,
                        allFundTxns
                    );
                    const equityProfit = cash.amount - cfg.account_size;
                    const target = computeDailyTarget(effective.profitTarget, effective.consistency, dailyPnL, cfg.min_day_pnl, effective.minTradingDays, equityProfit);
                    dailyTarget = target;

                    // Effective profit target = max(stage target, consistency realTarget).
                    // If a big day forces the consistency rule, the account must reach maxDay/consistency
                    // in total trading profit for the stage, not just profitTarget.
                    const qualifying = cfg.min_day_pnl === 0 ? dailyPnL : dailyPnL.filter((d) => d.pnl >= cfg.min_day_pnl);
                    const maxDay = qualifying.length > 0 ? Math.max(...qualifying.map((d) => d.pnl)) : 0;
                    const consistencyReal = (effective.consistency > 0 && effective.consistency < 1 && maxDay > 0)
                        ? maxDay / effective.consistency : 0;
                    effectiveProfitTarget = Math.max(effective.profitTarget, consistencyReal);
                    // Condition 1: profit target already exceeded (target=0), still need days → any activity counts
                    // Condition 2: target > 0 → must have made at least the computed daily target
                    if (target) {
                        targetHit =
                            (target.amount === 0 && Math.abs(cash.realizedPnL) > 0 && client.daysTraded[acc.id] <= effective.minTradingDays) ||
                            (cash.realizedPnL >= target.amount);
                    }
                }

                return {
                    id: acc.id,
                    name: acc.name,
                    active: acc.active,
                    amount: cash.amount,
                    realizedPnL: cash.realizedPnL,
                    daysTraded,
                    positionDirection: client.positions[acc.id]
                        ? (client.positions[acc.id].netPos > 0 ? 'long' as const : 'short' as const)
                        : null,
                    autoLiqThreshold,
                    totalProfit,
                    targetHit,
                    stage,
                    dailyTarget,
                    effectiveProfitTarget,
                    dailyPnL,
                    fullDailyPnL: client.fullDailyPnL?.[acc.id] ?? loadDailyPnL(acc.id),
                    fundTransactions: displayFundTxns,
                };
            });
            return { firm: f.name, connected: true, accounts };
        });

        return NextResponse.json(state);
    } catch (err) {
        console.error('[GET /api/state]', err);
        return NextResponse.json({ error: 'Failed to fetch state' }, { status: 500 });
    }
}