velxio/frontend/src/components/DynamicComponent.tsx

/**
 * Dynamic Component Renderer
 *
 * Generic component that renders any wokwi-element web component dynamically.
 * Replaces individual React wrapper components (LED.tsx, Resistor.tsx, etc.)
 *
 * Features:
 * - Creates web component from metadata
 * - Syncs React props to web component properties
 * - Extracts pinInfo from DOM for wire connections
 * - Handles component lifecycle
 */

import React, { useRef, useEffect, useCallback } from 'react';
import type { ComponentMetadata } from '../types/component-metadata';
import { useSimulatorStore } from '../store/useSimulatorStore';
import { useElectricalStore } from '../store/useElectricalStore';
import { useEditorStore } from '../store/useEditorStore';
import { buildProjectSdImage, decodeSdFiles } from '../utils/sdCardFiles';
import { PartSimulationRegistry } from '../simulation/parts';
import { isBoardComponent, boardPinToNumber } from '../utils/boardPinMapping';
import { isKeyBindable, formatKeyLabel } from '../utils/keyButtonBindings';
import {
  createDefaultPinResolver,
  createSpiceResolvedPinResolver,
  configFromLogicFamily,
  isActiveDevice,
  type PinResolver,
} from '../simulation/PinResolver';
import { BOARD_PIN_GROUPS } from '../simulation/spice/boardPinGroups';
import { syntheticChipPin } from '../simulation/customChips/syntheticPins';
import { resolveChipNetKey } from '../simulation/customChips/chipNets';
import { getMixedModeScheduler } from '../simulation/spice/MixedModeScheduler';
import { getBoardLogicFamily } from '../simulation/LogicFamilies';
import { breadboardGroupKey } from '../utils/breadboardNets';

// Side-effect imports: register every web component we'll create at runtime.
// `@wokwi/elements` covers the upstream catalog; `../velxio-elements` adds
// the velxio-local elements (e.g. <velxio-capacitor-electrolytic>,
// <velxio-instr-voltmeter>) that don't exist upstream.
import '@wokwi/elements';
import '../velxio-elements';
import './velxio-components/Ssd1306I2cElement'; // registers velxio-ssd1306-i2c-4pin (4-pin I2C OLED)

// Map metadataId → [pinA, pinB] for 2-terminal passives.
// "Tracing through" means: if the caller arrived on pinA, continue from pinB
// (and vice-versa).
//
// NOTE: diodes / transistors / op-amps are NOT traced through as passives —
// they have polarity / Vf / non-linear behaviour that the digital layer
// cannot interpret as "same pin". BJTs are an explicit shortcut for the
// canonical "Arduino digital pin controls a load via transistor" pattern so
// 7-segment multiplex circuits with BJT digit drivers still resolve.
const PASSIVE_PIN_PAIRS_BASE: Record<string, [string, string]> = {
  resistor: ['1', '2'],
  'resistor-us': ['1', '2'],
  capacitor: ['1', '2'],
  'capacitor-electrolytic': ['+', '−'],
  inductor: ['1', '2'],
  'analog-resistor': ['A', 'B'],
  'analog-capacitor': ['A', 'B'],
  'analog-inductor': ['A', 'B'],
  'bjt-2n2222': ['C', 'B'],
  'bjt-bc547': ['C', 'B'],
  'bjt-2n3055': ['C', 'B'],
  'bjt-2n3906': ['C', 'B'],
  'bjt-bc557': ['C', 'B'],
};
// Preset variants of the generic passives share their parent's tag and pin
// layout. Mirrors the PASSIVE_PRESETS map in spice/componentToSpice.ts.
const PRESET_TO_BASE: Record<string, string> = {
  'resistor-220': 'resistor',
  'resistor-330': 'resistor',
  'resistor-470': 'resistor',
  'resistor-1k': 'resistor',
  'resistor-2k2': 'resistor',
  'resistor-4k7': 'resistor',
  'resistor-10k': 'resistor',
  'resistor-22k': 'resistor',
  'resistor-47k': 'resistor',
  'resistor-100k': 'resistor',
  'resistor-1m': 'resistor',
  'cap-10p': 'capacitor',
  'cap-22p': 'capacitor',
  'cap-100p': 'capacitor',
  'cap-1n': 'capacitor',
  'cap-10n': 'capacitor',
  'cap-100n': 'capacitor',
  'cap-1u': 'capacitor',
  'cap-elec-1u': 'capacitor-electrolytic',
  'cap-elec-10u': 'capacitor-electrolytic',
  'cap-elec-47u': 'capacitor-electrolytic',
  'cap-elec-100u': 'capacitor-electrolytic',
  'cap-elec-470u': 'capacitor-electrolytic',
  'cap-elec-1000u': 'capacitor-electrolytic',
  'ind-100u': 'inductor',
  'ind-1m': 'inductor',
  'ind-10m': 'inductor',
};
const PASSIVE_PIN_PAIRS: Record<string, [string, string]> = {
  ...PASSIVE_PIN_PAIRS_BASE,
};
for (const [preset, base] of Object.entries(PRESET_TO_BASE)) {
  PASSIVE_PIN_PAIRS[preset] = PASSIVE_PIN_PAIRS_BASE[base];
}

type TraceState = ReturnType<typeof useSimulatorStore.getState>;

// Custom-chip output pins get stable synthetic pin numbers from
// simulation/customChips/syntheticPins so the chip is a first-class pin source.

// Depth-limited BFS: trace from (fromId, fromPin) through wires, traversing
// through passive components to reach a board pin.  Returns the arduino pin
// plus a `crossedActiveDevice` flag so the resolver factory can decide
// between digital fast-path and SPICE-resolved per-pin.
//
// A real board pin always wins (digital GPIO semantics are unchanged). Only
// when NO board pin is reachable do we fall back to a custom-chip pin on the
// net — either a neighbour chip pin, or (when the trace itself started at a
// chip pin) the starting chip pin — resolving it to its synthetic number.
//
// Lifted to module scope (was inside getArduinoPin) so that getPinResolver
// can call it too — the previous nested-scope version caused a runtime
// ReferenceError "traceDetailed is not defined" on the simulator page.
export function traceDetailed(
  state: TraceState,
  fromId: string,
  fromPin: string,
  depth: number,
  activeSeen = false,
): { arduinoPin: number | null; crossedActiveDevice: boolean } {
  if (depth > 6) return { arduinoPin: null, crossedActiveDevice: activeSeen };

  const wires = state.wires.filter(
    (w) =>
      (w.start.componentId === fromId && w.start.pinName === fromPin) ||
      (w.end.componentId === fromId && w.end.pinName === fromPin),
  );

  // Remember a custom-chip neighbour on this net (if any) as a fallback —
  // a real board pin found in any branch still takes priority over it.
  let chipNeighbour: { id: string; pin: string } | null = null;

  for (const w of wires) {
    const selfEp =
      w.start.componentId === fromId && w.start.pinName === fromPin ? w.start : w.end;
    const otherEp = selfEp === w.start ? w.end : w.start;

    // A board endpoint is recognised by the LIVE boards list first.
    // `isBoardComponent` matches static id prefixes ('arduino-uno', …), which
    // only covers the default board — every board added at runtime (the agent
    // mints UUID ids) failed the check, so tracing treated it as an unknown
    // component and returned null. Symptom: an ESP32 clock whose QEMU was
    // emitting hundreds of GPIO edges/second at a display that stayed dark,
    // because no resolver ever attached.
    const boardEp = state.boards.find((b) => b.id === otherEp.componentId);
    if (boardEp || isBoardComponent(otherEp.componentId)) {
      const boardKind = boardEp?.boardKind ?? otherEp.componentId;
      const pin = boardPinToNumber(boardKind, otherEp.pinName);
      if (pin !== null) return { arduinoPin: pin, crossedActiveDevice: activeSeen };
    } else {
      const comp = state.components.find((c) => c.id === otherEp.componentId);
      if (!chipNeighbour && comp?.metadataId === 'custom-chip') {
        chipNeighbour = { id: otherEp.componentId, pin: otherEp.pinName };
      }
      const pair = comp && PASSIVE_PIN_PAIRS[comp.metadataId];
      if (pair) {
        const [p1, p2] = pair;
        const otherPin = otherEp.pinName === p1 ? p2 : p1;
        const nowActive =
          activeSeen || (comp ? isActiveDevice(comp.metadataId) : false);
        const result = traceDetailed(
          state,
          otherEp.componentId,
          otherPin,
          depth + 1,
          nowActive,
        );
        if (result.arduinoPin !== null) return result;
      }

      // Breadboards join N holes per internal group (5-hole strip / power
      // rail), which the 2-terminal PASSIVE_PIN_PAIRS map can't express.
      // Continue the trace from every OTHER wired hole in the same group.
      //
      // Exclusion is by INCOMING WIRE, not by hole name: two wires may
      // legitimately share one hole (a seated pin plus a jumper landing in
      // that same hole — the agent bridges strips straight into the seat
      // hole). Excluding the arrival hole made those stacked connections
      // invisible: an ESP32 clock with QEMU firing hundreds of GPIO edges
      // per second sat dark because every segment's bridge landed on its
      // resistor's own seat hole and the trace dead-ended there.
      const bbGroup = comp && breadboardGroupKey(comp.metadataId, otherEp.pinName);
      if (bbGroup && comp) {
        const groupPins = new Set<string>();
        for (const gw of state.wires) {
          if (gw.id === w.id) continue; // never bounce back on the same wire
          for (const ep of [gw.start, gw.end]) {
            if (
              ep.componentId === comp.id &&
              breadboardGroupKey(comp.metadataId, ep.pinName) === bbGroup
            ) {
              groupPins.add(ep.pinName);
            }
          }
        }
        for (const groupPin of groupPins) {
          const result = traceDetailed(state, comp.id, groupPin, depth + 1, activeSeen);
          if (result.arduinoPin !== null) return result;
        }
      }
    }
  }

  // No board pin reachable. Multi-chip digital bus (chipbus flag, Phase 0 of
  // project/multichip-bus/): when this net has two or more chip endpoints and
  // no board pin, collapse every endpoint onto ONE net-canonical synthetic key
  // so a write on one chip is visible to another through the synchronous
  // PinManager fan-out (fixes root cause A: per-endpoint keys never matching).
  // resolveChipNetKey returns null when the flag is off, when a board owns the
  // net, or when there is a single chip endpoint — so the chip-to-component
  // rules below (2 and 3) are left exactly as-is. Scoped to depth 0 (the
  // starting chip pin); the key is net-bound, so a pin flipping INPUT<->OUTPUT
  // keeps the same key with no re-trace.
  if (depth === 0) {
    const netKey = resolveChipNetKey(state, fromId, fromPin);
    if (netKey !== null) {
      return { arduinoPin: netKey, crossedActiveDevice: activeSeen };
    }
  }

  // No board pin reachable. Fall back to a custom-chip pin on this net so the
  // chip can still drive / read it through the synthetic-pin PinManager key.
  if (chipNeighbour) {
    return {
      arduinoPin: syntheticChipPin(chipNeighbour.id, chipNeighbour.pin),
      crossedActiveDevice: activeSeen,
    };
  }
  if (depth === 0 && state.components.find((c) => c.id === fromId)?.metadataId === 'custom-chip') {
    return { arduinoPin: syntheticChipPin(fromId, fromPin), crossedActiveDevice: activeSeen };
  }
  return { arduinoPin: null, crossedActiveDevice: activeSeen };
}

interface DynamicComponentProps {
  id: string;
  metadata: ComponentMetadata;
  properties: Record<string, any>;
  x?: number;
  y?: number;
  isSelected?: boolean;
  isHovered?: boolean;
  onMouseDown?: (e: React.MouseEvent) => void;
  onDoubleClick?: (e: React.MouseEvent) => void;
  onMouseEnter?: () => void;
  onMouseLeave?: () => void;
  onPinInfoReady?: (pinInfo: any[]) => void;
}

export const DynamicComponent: React.FC<DynamicComponentProps> = ({
  id,
  metadata,
  properties,
  x = 0,
  y = 0,
  isSelected = false,
  isHovered = false,
  onMouseDown,
  onDoubleClick,
  onMouseEnter,
  onMouseLeave,
  onPinInfoReady,
}) => {
  const elementRef = useRef<HTMLElement>(null);
  const containerRef = useRef<HTMLDivElement>(null);
  const mountedRef = useRef(false);

  const handleComponentEvent = useSimulatorStore((s) => s.handleComponentEvent);
  const running = useSimulatorStore((s) => s.running);
  const simulator = useSimulatorStore((s) => s.simulator);
  // Board-less SPICE circuits (digital / analog gallery) have no MCU to
  // run, so `running` is always false — but interactive parts like
  // slide-switches and pushbuttons should still show a pointer cursor
  // and let the user click them. We treat board-less + un-paused as
  // "interactive" so the cursor + dialog gating mirror the MCU mode.
  const boardCount = useSimulatorStore((s) => s.boards.length);
  const electricalPaused = useElectricalStore((s) => s.paused);
  const interactionRunning = running || (boardCount === 0 && !electricalPaused);
  // hexEpoch increments each time a new hex is loaded, triggering a fresh
  // attachEvents call (and re-registration of I2C devices on the new bus).
  // We intentionally do NOT depend on `running` so that I2C displays and
  // other protocol parts (SSD1306, DS1307 …) are NOT torn down and
  // re-created on every stop/play cycle — which previously caused the
  // display to flash blank and lose its frame buffer.
  const hexEpoch = useSimulatorStore((s) => s.hexEpoch);
  // Runtime burnout (P4): destroyed parts render charred + a smoke badge.
  const isBurnt = useSimulatorStore((s) => s.burntComponents.has(id));

  // Track wires connected to this component so attachEvents re-runs when
  // wires are added or removed (e.g. disconnecting an LED cathode from GND).
  const wireFingerprint = useSimulatorStore((s) => {
    const myWires = s.wires.filter((w) => w.start.componentId === id || w.end.componentId === id);
    return myWires.map((w) => w.id).join(',');
  });

  // Check if component is interactive (has simulation logic with attachEvents)
  const logic = PartSimulationRegistry.get(metadata.id || id.split('-')[0]);
  const isInteractive = logic?.attachEvents !== undefined;

  /**
   * Sync React properties to Web Component.
   *
   * Values arriving as strings (agent set_component_property, the text
   * inputs in the property dialog) are coerced to the type of the
   * metadata DEFAULT for that key. Without this, `el.digits = '4'`
   * (string) silently breaks wokwi elements that strict-match
   * (`switch (this.digits) { case 4: ... }` -> falls back to the 1-digit
   * pinout), and `'false'` stays truthy for boolean props like colon.
   */
  useEffect(() => {
    if (!elementRef.current) return;

    Object.entries(properties).forEach(([key, value]) => {
      try {
        let coerced: any = value;
        if (typeof value === 'string') {
          const def = metadata.defaultValues?.[key];
          if (typeof def === 'number' && value.trim() !== '' && !Number.isNaN(Number(value))) {
            coerced = Number(value);
          } else if (typeof def === 'boolean') {
            coerced = value === 'true' || value === '1';
          }
        }
        (elementRef.current as any)[key] = coerced;
      } catch (error) {
        console.warn(`Failed to set property ${key} on ${metadata.tagName}:`, error);
      }
    });
  }, [properties, metadata.tagName]);

  /**
   * Property changes that swap the element's pin SET (7segment digits,
   * LED flip, display pins edge) re-render asynchronously and announce
   * themselves with a 'pininfo-change' event. Re-derive the breadboard
   * seating then — reseating synchronously on the property write would
   * read the STALE pinout and seat ghost pins.
   */
  useEffect(() => {
    const el = elementRef.current;
    if (!el) return;
    const onPinInfoChange = () => {
      try {
        useSimulatorStore.getState().reseatComponentOnBreadboard(id);
      } catch {
        // headless / tests
      }
    };
    el.addEventListener('pininfo-change', onPinInfoChange);
    return () => el.removeEventListener('pininfo-change', onPinInfoChange);
  }, [id, metadata.tagName]);

  /**
   * Reseat once the element's geometry first becomes measurable.
   *
   * A part can land in the store at its FINAL position before its element
   * mounts — the agent streams add_component + a seating move in one batch,
   * and `updateComponent`'s reseat then finds no DOM (computeSeating null)
   * and keeps the (empty) seating. Nothing re-derived it afterwards: the
   * seat-correction skips when the position needs no nudge, and
   * 'pininfo-change' only fires on pin-SET swaps, not on plain init. So the
   * part had no bb wires until the user dragged it or reloaded — a clock
   * started by the agent in that window ran against a dead display, while
   * reload+run worked (bb wires are persisted). Deriving the seating at
   * mount closes that hole for every path (agent, load, undo).
   */
  useEffect(() => {
    const tryReseat = () => {
      try {
        const pinInfo = (elementRef.current as any)?.pinInfo;
        if (pinInfo && Array.isArray(pinInfo) && pinInfo.length > 0) {
          useSimulatorStore.getState().reseatComponentOnBreadboard(id);
          return true;
        }
      } catch {
        // element not ready yet / headless tests
      }
      return false;
    };
    if (tryReseat()) return;
    // Same cadence as the pinInfo-ready poll above: the custom element may
    // upgrade a few frames after React commits.
    const interval = setInterval(() => {
      if (tryReseat()) clearInterval(interval);
    }, 100);
    const timeout = setTimeout(() => clearInterval(interval), 2000);
    return () => {
      clearInterval(interval);
      clearTimeout(timeout);
    };
  }, [id, metadata.tagName]);

  /**
   * Extract pinInfo from web component after it initializes
   */
  useEffect(() => {
    if (!elementRef.current || !onPinInfoReady) return;

    // Wait for web component to fully initialize
    const checkPinInfo = () => {
      try {
        const pinInfo = (elementRef.current as any)?.pinInfo;
        if (pinInfo && Array.isArray(pinInfo) && pinInfo.length > 0) {
          onPinInfoReady(pinInfo);
          return true;
        }
      } catch {
        // Element not ready yet
      }
      return false;
    };

    // Try immediately
    if (checkPinInfo()) return;

    // Otherwise poll every 100ms for up to 2 seconds
    const interval = setInterval(() => {
      if (checkPinInfo()) {
        clearInterval(interval);
      }
    }, 100);

    const timeout = setTimeout(() => {
      clearInterval(interval);
    }, 2000);

    return () => {
      clearInterval(interval);
      clearTimeout(timeout);
    };
  }, [onPinInfoReady]);

  /**
   * Handle mouse events
   */
  const handleMouseDown = useCallback(
    (e: React.MouseEvent) => {
      if (!onMouseDown) return;
      // Don't swallow the pointerdown for wokwi components that own their
      // own pointer interaction (rotary knobs, pushbuttons, slide-switches,
      // joysticks, keypads, encoders). For those the wokwi element binds
      // pointerdown/move/up on its shadow-DOM SVG; if we call
      // stopPropagation() in the capture phase here the internal logic
      // never sees the event and the knob can't rotate, the button never
      // reports pressed, etc.
      //
      // EVERY OTHER component (sensors, displays, LEDs, resistors, even
      // ones with attachEvents for the sensor-update / SPICE-prop bridge)
      // expects clicks to bubble up to the canvas → open the property
      // dialog or grab for drag-to-rearrange. The previous "swallow only
      // when isInteractive" heuristic was too broad: it included DHT22,
      // HC-SR04, NTC, photoresistor, LED, etc. — all of which have
      // attachEvents but no internal pointer handler, so clicks on them
      // SHOULD bubble. With the broad guard, those dialogs never opened.
      //
      // The whitelist below is tight on purpose: only add a tag name when
      // the wokwi element actually has its own pointerdown handler that
      // the user needs to reach. If a new interactive part is added,
      // append its tag here.
      const target = e.target as HTMLElement;
      const tag = target.tagName?.toLowerCase() ?? '';
      const ownsPointer =
        interactionRunning &&
        (tag === 'wokwi-pushbutton' ||
          tag === 'wokwi-pushbutton-6mm' ||
          tag === 'wokwi-potentiometer' ||
          tag === 'wokwi-slide-potentiometer' ||
          tag === 'wokwi-slide-switch' ||
          tag === 'wokwi-dip-switch-8' ||
          tag === 'wokwi-analog-joystick' ||
          tag === 'wokwi-ky-040' ||
          tag === 'wokwi-membrane-keypad' ||
          tag === 'wokwi-rotary-dialer');
      if (ownsPointer) {
        // Let the wokwi component own this pointerdown.
        return;
      }
      e.stopPropagation();
      onMouseDown(e);
    },
    [onMouseDown, interactionRunning],
  );

  const handleDoubleClick = useCallback(
    (e: React.MouseEvent) => {
      if (onDoubleClick) {
        e.stopPropagation();
        onDoubleClick(e);
      }
    },
    [onDoubleClick],
  );

  /**
   * Mount web component (only once)
   */
  useEffect(() => {
    if (!containerRef.current) return;

    // Prevent double-mount in React StrictMode
    if (mountedRef.current) {
      return;
    }

    const element = document.createElement(metadata.tagName);
    element.id = id;

    // Set initial properties
    Object.entries(properties).forEach(([key, value]) => {
      try {
        (element as any)[key] = value;
      } catch (error) {
        console.warn(`Failed to set initial property ${key}:`, error);
      }
    });

    containerRef.current.appendChild(element);
    elementRef.current = element;
    mountedRef.current = true;

    return () => {
      if (containerRef.current && element.parentNode === containerRef.current) {
        containerRef.current.removeChild(element);
      }
      elementRef.current = null;
      mountedRef.current = false;
    };
    // eslint-disable-next-line react-hooks/exhaustive-deps
  }, [metadata.tagName, id]); // Only re-create if tagName or id changes

  /**
   * Attach component-specific DOM events (like button presses)
   */
  useEffect(() => {
    const el = elementRef.current;
    if (!el) return;

    const onButtonPress = (e: Event) => handleComponentEvent(id, 'button-press', e);
    const onButtonRelease = (e: Event) => handleComponentEvent(id, 'button-release', e);

    el.addEventListener('button-press', onButtonPress);
    el.addEventListener('button-release', onButtonRelease);

    const logic = PartSimulationRegistry.get(metadata.id || id.split('-')[0]);

    let cleanupSimulationEvents: (() => void) | undefined;
    if (logic && logic.attachEvents) {
      // Board-less circuits (analog/digital SPICE examples) have no MCU
      // simulator, but input parts (switches, buttons, DIP switches) still
      // need their `change`/`button-press` events to fire `emitPropertyChange`
      // so the SPICE solver re-runs. Every part already guards its
      // `simulator.setPinState` / `pinManager.onPinChange` calls behind a
      // null pin lookup (`getArduinoPin` returns null when there's no board),
      // so the stub below is enough — it satisfies the type signature without
      // doing anything when called.
      const stubSimulator =
        simulator ??
        ({
          setPinState: () => {},
          isRunning: () => false,
          // Board-less circuits have no MCU simulator, but a custom chip still
          // needs a real PinManager so its digital pin writes/reads reach the
          // components wired to it (LEDs, buttons, other chips). Hand it the
          // shared flat PinManager that SimulatorCanvas subscribes LEDs to, so
          // both sides talk on the same numeric/synthetic pin ids. Falls back
          // to a no-op only if even that isn't ready yet.
          pinManager:
            (useSimulatorStore.getState().pinManager as any) ?? {
              onPinChange: () => () => {},
              triggerPinChange: () => {},
            },
        } as any);
      // Helper to find Arduino pin connected to a component pin.
      // Traces through electrically-transparent passive components so that a
      // circuit like  LED-cathode → resistor → GND  returns -1 (GND) instead
      // of null. Delegates to the module-level `traceDetailed`.
      //
      // Two call shapes are supported because this same function is passed
      // BOTH to PartSimulationRegistry handlers (which call it as
      // `getArduinoPin(componentPinName)`) AND to `createDefaultPinResolver`
      // as a `PinTracer` (which calls it as `tracePin(componentId,
      // componentPinName)`). When the second arg is present we treat the
      // first as a componentId override; otherwise we use the closure-
      // captured component id. The previous single-arg signature silently
      // matched the PinTracer 2-arg call as `(componentId, undefined)` —
      // traceDetailed then looked up a pin literally named "rgb-led-1" on
      // component "rgb-led-1", got null, and the PinResolver reported
      // FLOATING forever (the canonical "wokwi-rgb-led never lights up
      // even though SPICE is driving R/G/B" symptom).
      const getArduinoPin = (
        componentIdOrPin: string,
        maybePinName?: string,
      ): number | null => {
        const state = useSimulatorStore.getState();
        const componentId = maybePinName !== undefined ? componentIdOrPin : id;
        const componentPinName =
          maybePinName !== undefined ? maybePinName : componentIdOrPin;
        return traceDetailed(state, componentId, componentPinName, 0).arduinoPin;
      };

      // PinResolver factory — Phase 0 of the mixed-mode simulator project
      // (see project/sim-mixedmode/ in the velxio-prod repo). For now it
      // wraps getArduinoPin + pinManager.onPinChange — zero behavioral
      // change vs the legacy path. Phase 1+ will swap in a SPICE-resolved
      // implementation that watches node voltages and threshold-converts
      // to logic states.
      const simState = useSimulatorStore.getState();
      const ownerBoard =
        simState.boards.find((b) => b.id === simState.activeBoardId) ?? null;
      const ownerBoardVcc =
        (ownerBoard && BOARD_PIN_GROUPS[ownerBoard.boardKind as keyof typeof BOARD_PIN_GROUPS]?.vcc) ?? 5;
      const getPinResolver = (componentPinName: string): PinResolver | null => {
        const state = useSimulatorStore.getState();
        const pinManager = (stubSimulator as {
          pinManager?: {
            onPinChange?: (pin: number, cb: (pin: number, state: boolean) => void) => () => void;
            getPinState?: (pin: number) => boolean | null;
          };
        }).pinManager;

        // Phase 1b: detect whether the path between this component pin and
        // an Arduino pin passes through any active device (BJT, MOSFET,
        // op-amp, diode, regulator).  If yes → use the SPICE-resolved
        // resolver flavor so the digital state is derived from real node
        // voltages (handles transistor inversion, op-amp gain, diode
        // forward-drop, etc.).  If no → use the legacy digital fast-path
        // (zero SPICE cost, identical to Phase 0 behavior).
        const detailed = traceDetailed(state, id, componentPinName, 0);
        if (detailed.crossedActiveDevice) {
          const scheduler = getMixedModeScheduler();
          // Phase 3: threshold model from the OWNER BOARD's logic family
          // (e.g. AVR_HC for Uno, LVCMOS33 for ESP32).  Includes Schmitt
          // hysteresis when the family declares it.  Phase 3 continued
          // will let individual components override via a `logicFamily`
          // field in components-metadata.json so e.g. a 74HC14 input
          // gets Schmitt behavior even when driven from an AVR.
          const family = ownerBoard
            ? getBoardLogicFamily(ownerBoard.boardKind)
            : { vcc: ownerBoardVcc, vil: ownerBoardVcc / 2, vih: ownerBoardVcc / 2 };
          return createSpiceResolvedPinResolver(
            id,
            componentPinName,
            scheduler,
            configFromLogicFamily(family),
          );
        }

        return createDefaultPinResolver(
          id,
          componentPinName,
          {
            components: state.components,
            boards: state.boards,
            wires: state.wires,
            ownerBoard,
            ownerBoardVcc,
            subscribeArduinoPin: (pin, cb) => {
              if (!pinManager?.onPinChange) return () => {};
              return pinManager.onPinChange(pin, cb);
            },
            readArduinoPin: (pin) => {
              if (!pinManager?.getPinState) return null;
              try {
                return pinManager.getPinState(pin);
              } catch {
                return null;
              }
            },
          },
          getArduinoPin,
        );
      };

      // microSD auto-copy (free, Wokwi model): bake the project's workspace
      // files into a FAT16 image the card serves over SD-over-SPI. Paid uploads
      // (the "SD Card" panel) will merge into this list in a later phase.
      if (metadata.id === 'microsd-card') {
        try {
          const uploaded = decodeSdFiles(properties.sdFiles); // paid uploads (if any)
          (el as unknown as { sdImageData?: Uint8Array }).sdImageData =
            buildProjectSdImage(useEditorStore.getState().files, uploaded);
        } catch (e) {
          console.warn('[microsd] SD image build failed:', e);
        }
      }

      cleanupSimulationEvents = logic.attachEvents(
        el,
        stubSimulator,
        getArduinoPin,
        id,
        getPinResolver,
      );
    }

    return () => {
      if (cleanupSimulationEvents) cleanupSimulationEvents();

      el.removeEventListener('button-press', onButtonPress);
      el.removeEventListener('button-release', onButtonRelease);
    };
  }, [id, handleComponentEvent, metadata.id, simulator, hexEpoch, wireFingerprint]);

  // The wrapper uses `onMouseDownCapture` (not `onMouseDown`) so it sees
  // the mousedown BEFORE the inner wokwi-element. Interactive wokwi parts
  // (pushbutton, slide-switch, potentiometer …) call stopPropagation in
  // their own bubble-phase handlers, which used to prevent any drag from
  // starting once the simulator was running. Capture phase fires first
  // and lets the canvas's drag-threshold logic distinguish click vs drag
  // at mouseup time — so the user can rearrange interactive components
  // while simulation is live.
  return (
    <div
      className={`dynamic-component-wrapper${isBurnt ? ' velxio-burnt' : ''}`}
      style={{
        position: 'absolute',
        left: `${x}px`,
        top: `${y}px`,
        cursor: interactionRunning && isInteractive ? 'pointer' : 'move',
        border: isSelected ? '2px dashed #007acc' : '2px solid transparent',
        borderRadius: '4px',
        padding: '4px',
        userSelect: 'none',
        zIndex: isSelected ? 5 : 1,
        pointerEvents: 'auto',
        transform: properties.rotation ? `rotate(${properties.rotation}deg)` : undefined,
        transformOrigin: 'center center',
      }}
      onMouseDownCapture={handleMouseDown}
      onDoubleClick={handleDoubleClick}
      onMouseEnter={onMouseEnter}
      onMouseLeave={onMouseLeave}
      data-component-id={id}
      data-component-type={metadata.id}
    >
      {/* Container for web component */}
      <div ref={containerRef} className="web-component-container" />

      {/* Runtime-burnout smoke badge (P4) */}
      {isBurnt && (
        <div
          className="velxio-burnt-smoke"
          aria-hidden="true"
          style={{ position: 'absolute', top: '-7px', right: '-7px', pointerEvents: 'none', zIndex: 6 }}
        >
          <svg width="22" height="22" viewBox="0 0 24 24" fill="none">
            <circle cx="8" cy="14" r="5" fill="#6b7280" opacity="0.85" />
            <circle cx="14" cy="11" r="6" fill="#9ca3af" opacity="0.85" />
            <circle cx="17" cy="16" r="4" fill="#4b5563" opacity="0.85" />
            <circle cx="11" cy="8" r="3.5" fill="#9ca3af" opacity="0.7" />
          </svg>
        </div>
      )}

      {/* Component label — revealed on hover/selection only.
          A dense board (e.g. 8 vertical resistors at 19 px pitch) turned into
          a wall of overlapping "Resistor 220 Ω" text that hid the breadboard
          holes and the parts themselves. Hidden with OPACITY, never
          `display`/`position`: pinPositionCalculator derives the rotation
          pivot from `wrapper.offsetHeight`, so taking the label out of flow
          would move every rotated component's pins. */}
      <div
        className="component-label"
        style={{
          fontSize: '11px',
          textAlign: 'center',
          marginTop: '4px',
          color: '#666',
          pointerEvents: 'none',
          display: 'flex',
          alignItems: 'center',
          justifyContent: 'center',
          gap: '4px',
          opacity: isHovered || isSelected ? 1 : 0,
          transition: 'opacity 120ms ease-out',
        }}
      >
        {properties.pin !== undefined ? `Pin ${properties.pin}` : metadata.name}
        {isKeyBindable(metadata.id) && typeof properties.key === 'string' && properties.key && (
          <span
            style={{
              fontSize: '9px',
              padding: '1px 5px',
              borderRadius: '3px',
              backgroundColor: '#2d2d2d',
              color: '#ddd',
              border: '1px solid #555',
              borderBottomWidth: '2px',
              fontFamily: "'SFMono-Regular', Consolas, 'Liberation Mono', monospace",
              fontWeight: 600,
              lineHeight: '1.3',
              whiteSpace: 'nowrap',
            }}
          >
            {formatKeyLabel(properties.key)}
          </span>
        )}
        {properties.protocol && (
          <span
            style={{
              fontSize: '9px',
              padding: '1px 4px',
              borderRadius: '3px',
              backgroundColor: properties.protocol === 'spi' ? '#e67e22' : '#3498db',
              color: '#fff',
              fontWeight: 600,
              textTransform: 'uppercase',
              lineHeight: '1.2',
            }}
          >
            {String(properties.protocol)}
          </span>
        )}
      </div>
    </div>
  );
};

/**
 * Helper function to create a component instance from metadata
 */
export function createComponentFromMetadata(
  metadata: ComponentMetadata,
  x: number,
  y: number,
): {
  id: string;
  metadataId: string;
  x: number;
  y: number;
  properties: Record<string, any>;
} {
  // Underscore separators (not '-') so the resulting id is safe to embed
  // in SPICE component / source names. ngspice's WASM build truncates
  // vector keys at '-', which broke branch-current lookups for any LED /
  // ammeter wired up by the user (visible symptom: correct node voltage,
  // dark LED). Also strip '-' from metadata.id (e.g. 'led-bar-graph') so
  // the prefix doesn't reintroduce a hyphen.
  const safePrefix = metadata.id.replace(/-/g, '_');
  const properties: Record<string, any> = { ...metadata.defaultValues };
  // Resistors default to vertical: they read better, take less horizontal
  // space, and drop straight into breadboard columns (their pin span
  // bridges the center trench). Covers 'resistor' and every preconfigured
  // 'resistor-<value>' variant; anything with an explicit rotation in its
  // metadata defaults keeps it.
  if (metadata.id.startsWith('resistor') && properties.rotation === undefined) {
    properties.rotation = 90;
  }
  return {
    id: `${safePrefix}_${Date.now()}_${Math.random().toString(36).substr(2, 9)}`,
    metadataId: metadata.id,
    x,
    y,
    properties,
  };
}