import { NextResponse } from 'next/server';
import { loadDailyPnL } from '@/lib/db';
import { getClients } from '@/lib/clients';
import { getCachedCatalog } from '@/lib/firm-catalog';
import { getAccountConfig, getInferredSize, matchAccountType } from '@/lib/account-type-resolver';
import { computeDayPlan, resolveEffectiveConfig, currentTradeDateCT, LEG_COMPLETION_EPSILON } from '@/lib/trading-logic';

export async function GET() {
    try {
        const firms = getCachedCatalog();
        const clients = getClients();
        const tradeDate = currentTradeDateCT();

        const state = firms.map((f) => {
            const client = clients.get(f.id);
            // connected == the Tradovate sync has come back, NOT "has accounts".
            // A firm with no accounts is a real, settled state and must not be
            // reported the same way as one that is still authenticating.
            const connected = !!client && client.syncComplete;
            if (!client || client.accountList.length === 0) {
                return { firmId: f.id, firm: f.name, connected, 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);

                // One lookup against the assignment table — no prefix matching
                // here any more. An unassigned account gets no targets, which
                // is also what stops it being traded.
                const resolved = getAccountConfig(acc.id);
                const cfg = resolved.accountType;
                const inferredAccountSize = getInferredSize(acc.id, client);
                // 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.minDayPnL > 0
                    ? dailyPnL.filter((d) => d.pnl >= cfg.minDayPnL).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 fundingAmount = cfg?.accountSize ?? inferredAccountSize;
                const displayFundTxns = fundingAmount !== null
                    ? allFundTxns.filter((f) => f.amount !== fundingAmount)
                    : allFundTxns;
                // Surfaced so the dashboard can flag an account whose type was
                // picked out of several equally valid matches.
                const ambiguous = cfg
                    ? matchAccountType(acc.name, inferredAccountSize, f.accountTypes).ambiguous
                    : false;
                let targetHit = false;
                let dailyTarget: { amount: number; path: 'first_day' | 'normal_day' | 'reduced_day' } | null = null;
                let remainingToday: number | null = null;
                let effectiveProfitTarget: number | null = null;
                if (cfg && !isDead) {
                    const effective = resolveEffectiveConfig(
                        cfg.profitTarget,
                        cfg.consistency,
                        cfg.minTradingDays,
                        cfg.targetSameEquity,
                        cfg.withdrawalStages,
                        priorProfit,
                        allFundTxns
                    );
                    const equityProfit = cash.amount - cfg.accountSize;
                    const plan = computeDayPlan(
                        acc.id, tradeDate, effective.profitTarget, effective.consistency,
                        dailyPnL, cfg.minDayPnL, effective.minTradingDays, equityProfit, cash.realizedPnL,
                        cfg.splitEnabled
                    );
                    dailyTarget = plan ? { amount: plan.dayTarget, path: plan.path } : null;
                    remainingToday = plan?.remainingToday ?? null;

                    // 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.minDayPnL === 0 ? dailyPnL : dailyPnL.filter((d) => d.pnl >= cfg.minDayPnL);
                    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 → all legs done (day's remaining target used up)
                    if (plan) {
                        targetHit =
                            (plan.dayTarget === 0 && Math.abs(cash.realizedPnL) > 0 && client.daysTraded[acc.id] <= effective.minTradingDays) ||
                            (cash.realizedPnL > 0 && plan.remainingToday <= LEG_COMPLETION_EPSILON);
                    }
                }

                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,
                    remainingToday,
                    effectiveProfitTarget,
                    dailyPnL,
                    fullDailyPnL: client.fullDailyPnL?.[acc.id] ?? loadDailyPnL(acc.id),
                    fundTransactions: displayFundTxns,
                    accountTypeId: resolved.accountTypeId,
                    accountTypeLabel: cfg?.label ?? null,
                    assignmentSource: resolved.source,
                    accountType: cfg,
                    inferredAccountSize,
                    accountTypeAmbiguous: ambiguous,
                };
            });
            return { firmId: f.id, firm: f.name, connected, accounts };
        });

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