import { useState } from 'react';
import { Link } from '@tanstack/react-router';
import {
  useTradingConfig,
  useSetTradingMode,
  usePendingApprovals,
  useReviewApproval,
  useActiveLockouts,
  useCreateLockout,
  useDeleteLockout,
  useMacroStatus,
  useToggleMacro,
  useCompetitiveStatus,
  useToggleCompetitive,
  useApprovalConfig,
  useUpdateApprovalConfig,
} from '../api/hooks';
import { useResetPaperTrading, useTradingStatus, useUpdateTradingConfig } from '../api/tradingHooks';
import { StatusBadge, LoadingSpinner, Card } from '../components/ui';

export function TradingPage() {
  const { data: config, isLoading: configLoading } = useTradingConfig();
  const { data: approvals } = usePendingApprovals();
  const { data: lockouts } = useActiveLockouts();
  const { data: macroStatus } = useMacroStatus();
  const { data: competitiveStatus } = useCompetitiveStatus();
  const setMode = useSetTradingMode();
  const resetTrading = useResetPaperTrading();
  const { data: tradingStatus } = useTradingStatus();
  const updateConfig = useUpdateTradingConfig();
  const reviewApproval = useReviewApproval();
  const toggleMacro = useToggleMacro();
  const toggleCompetitive = useToggleCompetitive();
  const { data: approvalConfig } = useApprovalConfig();
  const updateApprovalConfig = useUpdateApprovalConfig();
  const createLockout = useCreateLockout();
  const deleteLockout = useDeleteLockout();

  const [lockoutTicker, setLockoutTicker] = useState('');
  const [lockoutReason, setLockoutReason] = useState('');
  const [lockoutDuration, setLockoutDuration] = useState(60);

  // Normalize API field names (API returns macro_enabled/competitive_enabled, not enabled)
  const macroEnabled = macroStatus?.enabled ?? macroStatus?.macro_enabled ?? false;
  const competitiveEnabled = competitiveStatus?.enabled ?? competitiveStatus?.competitive_enabled ?? false;
  const autoApprovePaper = approvalConfig?.auto_approve_paper ?? true;
  const [confirmMode, setConfirmMode] = useState<string | null>(null);
  const [confirmMacroToggle, setConfirmMacroToggle] = useState(false);
  const [confirmCompetitiveToggle, setConfirmCompetitiveToggle] = useState(false);
  const [confirmApprovalToggle, setConfirmApprovalToggle] = useState(false);

  if (configLoading) return <LoadingSpinner />;

  const currentMode = config?.trading_mode ?? 'paper';

  return (
    <div className="space-y-6">
      <h1 className="text-xl font-semibold text-gray-100">Trading Controls</h1>

      {/* Trading Mode */}
      <Card>
        <h2 className="mb-3 text-sm font-medium text-gray-400">Trading Mode</h2>
        <div className="flex items-center gap-3">
          {['paper', 'live', 'disabled'].map((mode) => (
            <button
              key={mode}
              onClick={() => {
                if (mode === currentMode) return;
                if (mode === 'live') { setConfirmMode(mode); return; }
                setMode.mutate(mode);
              }}
              className={`rounded-md px-4 py-2 text-sm font-medium capitalize transition-colors ${
                currentMode === mode
                  ? 'bg-brand-600 text-white'
                  : 'border border-surface-700 bg-surface-900 text-gray-400 hover:bg-surface-800'
              }`}
              aria-pressed={currentMode === mode}
            >
              {mode}
            </button>
          ))}
          <Link
            to="/trading/engine"
            search={{ tab: 'override' }}
            className="rounded-md bg-red-600 px-4 py-2 text-sm font-medium text-white hover:bg-red-700"
            data-testid="override-trade-button"
          >
            Override Trade
          </Link>
        </div>

        {/* Confirmation dialog for live mode */}
        {confirmMode && (
          <div className="mt-4 rounded-lg border border-orange-700/50 bg-orange-900/20 p-4">
            <p className="text-sm text-orange-300">
              Are you sure you want to switch to <span className="font-semibold">{confirmMode}</span> mode?
              This enables real order execution.
            </p>
            <div className="mt-3 flex gap-2">
              <button
                onClick={() => { setMode.mutate(confirmMode); setConfirmMode(null); }}
                className="rounded-md bg-orange-600 px-3 py-1.5 text-sm font-medium text-white hover:bg-orange-700"
              >
                Confirm
              </button>
              <button
                onClick={() => setConfirmMode(null)}
                className="rounded-md border border-surface-700 px-3 py-1.5 text-sm text-gray-400 hover:bg-surface-800"
              >
                Cancel
              </button>
            </div>
          </div>
        )}
      </Card>

      {/* Paper Trading Reset */}
      <ResetCard
        onReset={(params) => resetTrading.mutate(params)}
        isResetting={resetTrading.isPending}
      />

      {/* Risk Tier */}
      <Card>
        <h2 className="mb-3 text-sm font-medium text-gray-400">Risk Tier</h2>
        <p className="mb-3 text-[10px] text-gray-600">
          Controls confidence gates, position sizing, and portfolio heat limits for the trading engine.
        </p>
        <div className="flex items-center gap-3">
          {(['conservative', 'moderate', 'aggressive'] as const).map((tier) => {
            const currentTier = tradingStatus?.risk_tier ?? 'moderate';
            const descriptions: Record<string, string> = {
              conservative: 'Min confidence 0.75, max 5% position, 10% heat',
              moderate: 'Min confidence 0.55, max 10% position, 20% heat',
              aggressive: 'Min confidence 0.40, max 15% position, 30% heat',
            };
            return (
              <button
                key={tier}
                onClick={() => {
                  if (tier !== currentTier) updateConfig.mutate({ risk_tier: tier });
                }}
                className={`rounded-md px-4 py-2 text-sm font-medium capitalize transition-colors ${
                  currentTier === tier
                    ? 'bg-brand-600 text-white'
                    : 'border border-surface-700 bg-surface-900 text-gray-400 hover:bg-surface-800'
                }`}
                aria-pressed={currentTier === tier}
                title={descriptions[tier]}
              >
                {tier}
              </button>
            );
          })}
        </div>
      </Card>

      {/* Macro Signal Layer Toggle */}
      <Card>
        <h2 className="mb-3 text-sm font-medium text-gray-400">Macro Signal Layer</h2>
        <div className="flex items-center gap-4">
          <button
            onClick={() => setConfirmMacroToggle(true)}
            className={`relative inline-flex h-6 w-11 shrink-0 cursor-pointer rounded-full border-2 border-transparent transition-colors focus:outline-none focus:ring-2 focus:ring-brand-500 focus:ring-offset-2 focus:ring-offset-surface-900 ${
              macroEnabled ? 'bg-brand-600' : 'bg-surface-700'
            }`}
            role="switch"
            aria-checked={macroEnabled ?? false}
            aria-label="Toggle macro signal layer"
          >
            <span
              className={`pointer-events-none inline-block h-5 w-5 rounded-full bg-white shadow ring-0 transition-transform ${
                macroEnabled ? 'translate-x-5' : 'translate-x-0'
              }`}
            />
          </button>
          <span className="text-sm text-gray-300">
            {macroEnabled ? 'Enabled' : 'Disabled'}
          </span>
          {macroStatus?.toggled_at && (
            <span className="text-xs text-gray-500">
              Last changed: {new Date(macroStatus.toggled_at).toLocaleString()}
              {macroStatus.toggled_by && ` by ${macroStatus.toggled_by}`}
            </span>
          )}
        </div>

        {/* Confirmation dialog for macro toggle */}
        {confirmMacroToggle && (
          <div className="mt-4 rounded-lg border border-orange-700/50 bg-orange-900/20 p-4">
            <p className="text-sm text-orange-300">
              Are you sure you want to {macroEnabled ? 'disable' : 'enable'} the macro signal layer?
              {macroEnabled
                ? ' Disabling will exclude macro signals from trend summaries and recommendations.'
                : ' Enabling will include global event macro signals in trend summaries and recommendations.'}
            </p>
            <div className="mt-3 flex gap-2">
              <button
                onClick={() => {
                  toggleMacro.mutate(!macroEnabled);
                  setConfirmMacroToggle(false);
                }}
                className="rounded-md bg-orange-600 px-3 py-1.5 text-sm font-medium text-white hover:bg-orange-700"
              >
                Confirm
              </button>
              <button
                onClick={() => setConfirmMacroToggle(false)}
                className="rounded-md border border-surface-700 px-3 py-1.5 text-sm text-gray-400 hover:bg-surface-800"
              >
                Cancel
              </button>
            </div>
          </div>
        )}
      </Card>

      {/* Competitive Signal Layer Toggle */}
      <Card>
        <h2 className="mb-3 text-sm font-medium text-gray-400">Competitive Signal Layer</h2>
        <div className="flex items-center gap-4">
          <button
            onClick={() => setConfirmCompetitiveToggle(true)}
            className={`relative inline-flex h-6 w-11 shrink-0 cursor-pointer rounded-full border-2 border-transparent transition-colors focus:outline-none focus:ring-2 focus:ring-brand-500 focus:ring-offset-2 focus:ring-offset-surface-900 ${
              competitiveEnabled ? 'bg-brand-600' : 'bg-surface-700'
            }`}
            role="switch"
            aria-checked={competitiveEnabled ?? false}
            aria-label="Toggle competitive signal layer"
          >
            <span
              className={`pointer-events-none inline-block h-5 w-5 rounded-full bg-white shadow ring-0 transition-transform ${
                competitiveEnabled ? 'translate-x-5' : 'translate-x-0'
              }`}
            />
          </button>
          <span className="text-sm text-gray-300">
            {competitiveEnabled ? 'Enabled' : 'Disabled'}
          </span>
          {competitiveStatus?.toggled_at && (
            <span className="text-xs text-gray-500">
              Last changed: {new Date(competitiveStatus.toggled_at).toLocaleString()}
              {competitiveStatus.toggled_by && ` by ${competitiveStatus.toggled_by}`}
            </span>
          )}
        </div>

        {/* Confirmation dialog for competitive toggle */}
        {confirmCompetitiveToggle && (
          <div className="mt-4 rounded-lg border border-orange-700/50 bg-orange-900/20 p-4">
            <p className="text-sm text-orange-300">
              Are you sure you want to {competitiveEnabled ? 'disable' : 'enable'} the competitive signal layer?
              {competitiveEnabled
                ? ' Disabling will exclude historical pattern and competitive signals from trend summaries and recommendations.'
                : ' Enabling will include historical pattern and competitive signals in trend summaries and recommendations.'}
            </p>
            <div className="mt-3 flex gap-2">
              <button
                onClick={() => {
                  toggleCompetitive.mutate(!competitiveEnabled);
                  setConfirmCompetitiveToggle(false);
                }}
                className="rounded-md bg-orange-600 px-3 py-1.5 text-sm font-medium text-white hover:bg-orange-700"
              >
                Confirm
              </button>
              <button
                onClick={() => setConfirmCompetitiveToggle(false)}
                className="rounded-md border border-surface-700 px-3 py-1.5 text-sm text-gray-400 hover:bg-surface-800"
              >
                Cancel
              </button>
            </div>
          </div>
        )}
      </Card>

      {/* Paper Order Approval Toggle */}
      <Card>
        <h2 className="mb-3 text-sm font-medium text-gray-400">Paper Order Approval</h2>
        <div className="flex items-center gap-4">
          <button
            onClick={() => setConfirmApprovalToggle(true)}
            className={`relative inline-flex h-6 w-11 shrink-0 cursor-pointer rounded-full border-2 border-transparent transition-colors focus:outline-none focus:ring-2 focus:ring-brand-500 focus:ring-offset-2 focus:ring-offset-surface-900 ${
              !autoApprovePaper ? 'bg-brand-600' : 'bg-surface-700'
            }`}
            role="switch"
            aria-checked={!autoApprovePaper}
            aria-label="Toggle paper order approval requirement"
          >
            <span
              className={`pointer-events-none inline-block h-5 w-5 rounded-full bg-white shadow ring-0 transition-transform ${
                !autoApprovePaper ? 'translate-x-5' : 'translate-x-0'
              }`}
            />
          </button>
          <span className="text-sm text-gray-300">
            {autoApprovePaper ? 'Auto-approve paper orders' : 'Require approval for paper orders'}
          </span>
        </div>

        {/* Confirmation dialog for approval toggle */}
        {confirmApprovalToggle && (
          <div className="mt-4 rounded-lg border border-orange-700/50 bg-orange-900/20 p-4">
            <p className="text-sm text-orange-300">
              Are you sure you want to {autoApprovePaper ? 'require approval for' : 'auto-approve'} paper orders?
              {autoApprovePaper
                ? ' Enabling approval requirements will hold all paper orders for manual review before execution.'
                : ' Disabling approval requirements will allow paper orders to execute automatically.'}
            </p>
            <div className="mt-3 flex gap-2">
              <button
                onClick={() => {
                  updateApprovalConfig.mutate({ auto_approve_paper: !autoApprovePaper });
                  setConfirmApprovalToggle(false);
                }}
                className="rounded-md bg-orange-600 px-3 py-1.5 text-sm font-medium text-white hover:bg-orange-700"
              >
                Confirm
              </button>
              <button
                onClick={() => setConfirmApprovalToggle(false)}
                className="rounded-md border border-surface-700 px-3 py-1.5 text-sm text-gray-400 hover:bg-surface-800"
              >
                Cancel
              </button>
            </div>
          </div>
        )}
      </Card>

      {/* Pending Approvals */}
      <Card>
        <h2 className="mb-3 text-sm font-medium text-gray-400">
          Pending Approvals ({approvals?.length ?? 0})
        </h2>
        {!approvals?.length ? (
          <p className="text-sm text-gray-500">No pending approvals</p>
        ) : (
          <div className="space-y-2">
            {approvals.map((a) => (
              <ApprovalRow key={a.id} approval={a} onReview={(approved, note) => reviewApproval.mutate({ id: a.id, approved, review_note: note })} />
            ))}
          </div>
        )}
      </Card>

      {/* Active Lockouts */}
      <Card>
        <h2 className="mb-3 text-sm font-medium text-gray-400">
          Active Lockouts ({lockouts?.length ?? 0})
        </h2>

        {/* Lockout Creation Form */}
        <form
          className="mb-4 flex flex-wrap items-end gap-2 rounded border border-surface-700 bg-surface-900 p-3"
          onSubmit={(e) => {
            e.preventDefault();
            if (!lockoutTicker.trim()) return;
            createLockout.mutate(
              { ticker: lockoutTicker.trim().toUpperCase(), reason: lockoutReason.trim(), duration_minutes: lockoutDuration },
              {
                onSuccess: () => {
                  setLockoutTicker('');
                  setLockoutReason('');
                  setLockoutDuration(60);
                },
              },
            );
          }}
        >
          <div className="flex flex-col gap-1">
            <label htmlFor="lockout-ticker" className="text-xs text-gray-500">Ticker</label>
            <input
              id="lockout-ticker"
              type="text"
              placeholder="AAPL"
              value={lockoutTicker}
              onChange={(e) => setLockoutTicker(e.target.value.toUpperCase())}
              className="w-24 rounded-md border border-surface-700 bg-surface-950 px-2 py-1 text-xs font-mono text-gray-200 uppercase placeholder-gray-600"
              required
            />
          </div>
          <div className="flex flex-1 flex-col gap-1">
            <label htmlFor="lockout-reason" className="text-xs text-gray-500">Reason</label>
            <input
              id="lockout-reason"
              type="text"
              placeholder="Manual lockout reason…"
              value={lockoutReason}
              onChange={(e) => setLockoutReason(e.target.value)}
              className="rounded-md border border-surface-700 bg-surface-950 px-2 py-1 text-xs text-gray-200 placeholder-gray-600"
              required
            />
          </div>
          <div className="flex flex-col gap-1">
            <label htmlFor="lockout-duration" className="text-xs text-gray-500">Minutes</label>
            <input
              id="lockout-duration"
              type="number"
              min={1}
              value={lockoutDuration}
              onChange={(e) => setLockoutDuration(Number(e.target.value))}
              className="w-20 rounded-md border border-surface-700 bg-surface-950 px-2 py-1 text-xs text-gray-200"
              required
            />
          </div>
          <button
            type="submit"
            disabled={createLockout.isPending}
            className="rounded-md bg-brand-600 px-3 py-1.5 text-xs font-medium text-white hover:bg-brand-700 disabled:opacity-50"
          >
            {createLockout.isPending ? 'Creating…' : 'Add Lockout'}
          </button>
        </form>

        {!lockouts?.length ? (
          <p className="text-sm text-gray-500">No active lockouts</p>
        ) : (
          <div className="space-y-2">
            {lockouts.map((l) => {
              const expiresIn = l.expires_at ? Math.max(0, Math.round((new Date(l.expires_at).getTime() - Date.now()) / 60000)) : 0;
              return (
                <div key={l.id} className="flex items-center justify-between rounded border border-surface-700 bg-surface-950 p-3">
                  <div className="flex items-center gap-3">
                    <span className="font-mono font-semibold text-brand-300">{l.ticker}</span>
                    <StatusBadge status={l.lockout_type} />
                    <span className="text-sm text-gray-400">{l.reason}</span>
                  </div>
                  <div className="flex items-center gap-2">
                    <span className="text-xs text-gray-500">
                      {expiresIn > 0 ? `${expiresIn}m remaining` : 'expired'}
                    </span>
                    <button
                      onClick={() => deleteLockout.mutate(l.id)}
                      disabled={deleteLockout.isPending}
                      className="rounded bg-red-700/80 px-2 py-0.5 text-xs font-medium text-red-100 hover:bg-red-600 disabled:opacity-50"
                    >
                      Remove
                    </button>
                  </div>
                </div>
              );
            })}
          </div>
        )}
      </Card>
    </div>
  );
}

function ApprovalRow({ approval, onReview }: {
  approval: { id: string; ticker: string; side: string; quantity: number; estimated_value: number | null; requested_at: string };
  onReview: (approved: boolean, note: string) => void;
}) {
  const [note, setNote] = useState('');

  return (
    <div className="rounded border border-surface-700 bg-surface-950 p-3">
      <div className="flex items-center justify-between">
        <div className="flex items-center gap-3">
          <span className="font-mono font-semibold text-brand-300">{approval.ticker}</span>
          <StatusBadge status={approval.side} />
          <span className="text-sm text-gray-300">qty: {approval.quantity}</span>
          {approval.estimated_value != null && (
            <span className="text-sm text-gray-500">${approval.estimated_value.toFixed(2)}</span>
          )}
        </div>
        <span className="text-xs text-gray-500">{new Date(approval.requested_at).toLocaleString()}</span>
      </div>
      <div className="mt-2 flex items-center gap-2">
        <input
          type="text"
          placeholder="Review note…"
          value={note}
          onChange={(e) => setNote(e.target.value)}
          className="flex-1 rounded-md border border-surface-700 bg-surface-900 px-2 py-1 text-xs text-gray-200 placeholder-gray-500"
          aria-label="Review note"
        />
        <button onClick={() => onReview(true, note)} className="rounded bg-green-700 px-3 py-1 text-xs font-medium text-white hover:bg-green-600">
          Approve
        </button>
        <button onClick={() => onReview(false, note)} className="rounded bg-red-700 px-3 py-1 text-xs font-medium text-white hover:bg-red-600">
          Reject
        </button>
      </div>
    </div>
  );
}


function ResetCard({ onReset, isResetting }: {
  onReset: (params: { initial_capital?: number; reserve_pct?: number }) => void;
  isResetting: boolean;
}) {
  const [showConfirm, setShowConfirm] = useState(false);
  const [capitalInput, setCapitalInput] = useState('100000');
  const [reservePct, setReservePct] = useState(20);
  const [useCustomCapital, setUseCustomCapital] = useState(false);

  const capital = parseFloat(capitalInput) || 0;
  const reserveAmount = capital * (reservePct / 100);
  const activeAmount = capital - reserveAmount;

  return (
    <Card>
      <h2 className="mb-3 text-sm font-medium text-gray-400">Paper Trading Account</h2>

      {/* Capital & Reserve Configuration */}
      <div className="mb-4 space-y-3 rounded-lg border border-surface-700 bg-surface-950 p-4">
        <div className="flex items-center gap-3">
          <button
            onClick={() => setUseCustomCapital(!useCustomCapital)}
            className={`relative inline-flex h-5 w-9 shrink-0 cursor-pointer rounded-full border-2 border-transparent transition-colors focus:outline-none focus:ring-2 focus:ring-brand-500 focus:ring-offset-2 focus:ring-offset-surface-900 ${
              useCustomCapital ? 'bg-brand-600' : 'bg-surface-700'
            }`}
            role="switch"
            aria-checked={useCustomCapital}
            aria-label="Set custom initial capital"
          >
            <span className={`pointer-events-none inline-block h-4 w-4 rounded-full bg-white shadow transition-transform ${
              useCustomCapital ? 'translate-x-4' : 'translate-x-0'
            }`} />
          </button>
          <span className="text-sm text-gray-300">Set initial capital</span>
          <span className="text-[10px] text-gray-600">(otherwise uses broker account balance)</span>
        </div>

        {useCustomCapital && (
          <div className="flex items-center gap-2">
            <label htmlFor="reset-capital" className="text-xs text-gray-500">Capital $</label>
            <input
              id="reset-capital"
              type="number"
              min={0}
              step={1000}
              value={capitalInput}
              onChange={(e) => setCapitalInput(e.target.value)}
              className="w-36 rounded-md border border-surface-700 bg-surface-900 px-2 py-1 text-sm font-mono text-gray-200"
            />
          </div>
        )}

        <div>
          <div className="flex items-center justify-between">
            <label htmlFor="reset-reserve" className="text-xs text-gray-500">
              Reserve pool: {reservePct}%
            </label>
            <span className="text-xs text-gray-600">
              Active: {100 - reservePct}%
            </span>
          </div>
          <input
            id="reset-reserve"
            type="range"
            min={0}
            max={50}
            step={5}
            value={reservePct}
            onChange={(e) => setReservePct(Number(e.target.value))}
            className="mt-1 w-full accent-brand-600"
          />
          {useCustomCapital && capital > 0 && (
            <div className="mt-1 flex justify-between text-[10px] text-gray-600">
              <span>Reserve: ${reserveAmount.toLocaleString(undefined, { maximumFractionDigits: 0 })}</span>
              <span>Active: ${activeAmount.toLocaleString(undefined, { maximumFractionDigits: 0 })}</span>
            </div>
          )}
        </div>
      </div>

      {/* Reset Button */}
      <div className="flex items-center justify-between">
        <div>
          <p className="text-sm text-gray-300">Full Reset</p>
          <p className="text-[10px] text-gray-600">
            Liquidates all broker positions, cancels open orders, wipes local trading history,
            and sets capital from {useCustomCapital ? 'the amount above' : 'the broker account balance'}.
          </p>
          <p className="mt-1 text-[10px] text-gray-600 italic">
            Note: To reset the Alpaca paper account balance itself, use the Alpaca dashboard.
          </p>
        </div>
        <button
          onClick={() => setShowConfirm(true)}
          disabled={isResetting}
          className="shrink-0 rounded-md border border-red-700/50 bg-red-900/20 px-3 py-1.5 text-sm font-medium text-red-400 hover:bg-red-900/40 disabled:opacity-50"
        >
          Reset Everything
        </button>
      </div>
      {showConfirm && (
        <div className="mt-3 rounded-lg border border-red-700/50 bg-red-900/20 p-4">
          <p className="text-sm text-red-300">
            This will <span className="font-semibold">permanently delete</span> all positions, orders,
            trading decisions, stop levels, portfolio snapshots, and backtest data.
            All broker positions will be liquidated.
            {useCustomCapital
              ? ` Capital will be set to $${capital.toLocaleString()} (${reservePct}% reserve / ${100 - reservePct}% active).`
              : ` Capital will be set from the broker's account balance (${reservePct}% reserve / ${100 - reservePct}% active).`}
          </p>
          <div className="mt-3 flex gap-2">
            <button
              onClick={() => {
                onReset({
                  initial_capital: useCustomCapital ? capital : undefined,
                  reserve_pct: reservePct / 100,
                });
                setShowConfirm(false);
              }}
              disabled={isResetting}
              className="rounded-md bg-red-600 px-3 py-1.5 text-sm font-medium text-white hover:bg-red-700 disabled:opacity-50"
            >
              {isResetting ? 'Resetting…' : 'Yes, Reset Everything'}
            </button>
            <button
              onClick={() => setShowConfirm(false)}
              className="rounded-md border border-surface-700 px-3 py-1.5 text-sm text-gray-400 hover:bg-surface-800"
            >
              Cancel
            </button>
          </div>
        </div>
      )}
    </Card>
  );
}