/**
 * Pilot V2-Tools Tests (Task A3): line + select.
 * line: Handler-Sequenz gegen echtes CADDocument (In-Memory), Undo-Verhalten.
 * select: Bridge-basierte Auswahl mit Shift/Ctrl.
 */
import { describe, it, expect, vi } from 'vitest';
import { lineTool, coreDrawingPlugin } from '../src/plugins/builtin/core-drawing';
import { selectTool, coreModifyPlugin } from '../src/plugins/builtin/core-modify';
import { coreAnnotatePlugin } from '../src/plugins/builtin/core-annotate';
import { coreMeasurePlugin } from '../src/plugins/builtin/core-measure';
import { eventToolsV2Plugin } from '../src/plugins/builtin/event-tools';
import { CADDocument } from '../src/kernel/document/CADDocument';
import { createInMemoryDoc } from './helpers/inMemoryDoc';
import type { ToolPointerEvent, FullToolContext } from '../src/plugins/types';
import type { CADElement } from '../src/types/cad.types';

function pe(x: number, y: number, mods: Partial<Pick<ToolPointerEvent, 'shift' | 'ctrl'>> = {}): ToolPointerEvent {
  return {
    world: { x, y },
    screen: { x: x / 2, y: y / 2 },
    button: 0,
    shift: mods.shift ?? false,
    alt: false,
    ctrl: mods.ctrl ?? false,
  };
}

function makeCtx(overrides: Partial<FullToolContext> = {}): FullToolContext & { previews: (CADElement | null)[]; statuses: string[] } {
  const previews: (CADElement | null)[] = [];
  const statuses: string[] = [];
  return {
    options: {},
    setStatus: (m) => statuses.push(m),
    setPreview: (el) => previews.push(el),
    previews,
    statuses,
    ...overrides,
  } as FullToolContext & { previews: (CADElement | null)[]; statuses: string[] };
}

function makeEl(id: string): CADElement {
  return { id, type: 'rect', layerId: 'l', x: 0, y: 0, width: 1, height: 1, properties: {} } as unknown as CADElement;
}

describe('A3 pilot: line tool', () => {
  it('erzeugt EINE Linie per down→up; ein undo entfernt sie', () => {
    const { ydoc } = createInMemoryDoc();
    const doc = new CADDocument(ydoc);
    const ctx = makeCtx({ doc });

    lineTool.handlers.down!(pe(0, 0), ctx);
    lineTool.handlers.move!(pe(100, 50), ctx);
    expect(ctx.previews.length).toBe(1);       // Live-Vorschau war da
    lineTool.handlers.up!(pe(100, 50), ctx);

    const all = doc.getAllElements();
    expect(all.length).toBe(1);
    expect(all[0].type).toBe('line');
    expect(all[0].properties.x1).toBe(0);
    expect(all[0].properties.y2).toBe(50);

    // Kern-Akzeptanz aus ROADMAP: Ein Werkzeug-Klick = ein Undo-Schritt
    expect(doc.undo()).toBe(true);
    expect(doc.getAllElements().length).toBe(0);
  });

  it('cancel verwirft die laufende Linie ohne Element', () => {
    const { ydoc } = createInMemoryDoc();
    const doc = new CADDocument(ydoc);
    const ctx = makeCtx({ doc });

    lineTool.handlers.down!(pe(5, 5), ctx);
    lineTool.handlers.cancel!(ctx);
    lineTool.handlers.up!(pe(9, 9), ctx);      // up nach cancel: kein Start mehr

    expect(doc.getAllElements().length).toBe(0);
  });

  it('Plugin-Manifest ist registrierbar und tagged basic', () => {
    expect(coreDrawingPlugin.manifest.enabledByDefault).toBe(true);
    const line = coreDrawingPlugin.tools?.find((t) => t.manifest.id === 'line');
    expect(line?.manifest.tags).toContain('basic');
  });
});

describe('A4.3 pilot: circle tool', () => {
  it('erzeugt Kreis Zentrum+Radius; ein undo entfernt ihn', () => {
    const { ydoc } = createInMemoryDoc();
    const doc = new CADDocument(ydoc);
    const ctx = makeCtx({ doc });
    const circle = coreDrawingPlugin.tools!.find((t) => t.manifest.id === 'circle')!;

    circle.handlers.down!(pe(100, 100), ctx);
    circle.handlers.move!(pe(200, 100), ctx);
    expect(ctx.previews.length).toBe(1);
    circle.handlers.up!(pe(200, 100), ctx);

    const all = doc.getAllElements();
    expect(all.length).toBe(1);
    expect(all[0].type).toBe('circle');
    expect(all[0].x).toBe(100);
    expect(all[0].properties.radius).toBe(100); // Distanz wie Legacy

    expect(doc.undo()).toBe(true);
    expect(doc.getAllElements().length).toBe(0);
  });
});

describe('A4.3 pilot: arc tool', () => {
  it('klick-progressiv: Zentrum→Start→Ende committet beim 3. Klick mit Grad-Winkeln', () => {
    const { ydoc } = createInMemoryDoc();
    const doc = new CADDocument(ydoc);
    const ctx = makeCtx({ doc });
    const arc = coreDrawingPlugin.tools!.find((t) => t.manifest.id === 'arc')!;

    // Klick 1: Zentrum (up gehört zum Klick, committet NICHT — klick-progressiv)
    arc.handlers.down!(pe(0, 0), ctx);
    expect(doc.getAllElements().length).toBe(0); // Phase 1/2 committet nie

    // Klick 2: Startpunkt auf Radius 50 nach Osten (0°)
    arc.handlers.down!(pe(50, 0), ctx);
    expect(doc.getAllElements().length).toBe(0);

    // Klick 3: Endpunkt oben (90°) → JETZT committet der dritte down
    arc.handlers.down!(pe(0, 50), ctx);

    const all = doc.getAllElements();
    expect(all.length).toBe(1);
    expect(all[0].type).toBe('arc');
    expect(all[0].x).toBe(0);
    expect(all[0].y).toBe(0);
    expect(all[0].properties.radius).toBe(50);
    expect(all[0].properties.startAngle).toBeCloseTo(0);
    expect(all[0].properties.endAngle).toBeCloseTo(90);

    expect(doc.undo()).toBe(true);
    expect(doc.getAllElements().length).toBe(0);
  });

  it('cancel bricht mehrphasige Sitzung vollstaendig ab', () => {
    const { ydoc } = createInMemoryDoc();
    const doc = new CADDocument(ydoc);
    const ctx = makeCtx({ doc });
    const arc = coreDrawingPlugin.tools!.find((t) => t.manifest.id === 'arc')!;

    arc.handlers.down!(pe(0, 0), ctx);      // phase 1
    arc.handlers.down!(pe(30, 0), ctx);     // phase 2
    arc.handlers.cancel!(ctx);              // reset
    arc.handlers.down!(pe(99, 99), ctx);    // startet neu bei phase 1

    // Kein Commit erfolgt (nur phase 1), nichts im Doc:
    expect(doc.getAllElements().length).toBe(0);
  });
});

describe('A4.3 pilot: polyline/polygon tools', () => {
  it('polyline sammelt Punkte und committet per ENTER ab 2', () => {
    const { ydoc } = createInMemoryDoc();
    const doc = new CADDocument(ydoc);
    const ctx = makeCtx({ doc });
    const pl = coreDrawingPlugin.tools!.find((t) => t.manifest.id === 'polyline')!;

    pl.handlers.down!(pe(0, 0), ctx);
    pl.handlers.move!(pe(10, 10), ctx);
    expect(ctx.previews.length).toBeGreaterThan(0);
    pl.handlers.down!(pe(20, 0), ctx);
    pl.handlers.down!(pe(30, 30), ctx);

    const kev = { key: 'Enter', preventDefault: () => {} } as unknown as KeyboardEvent;
    const consumed = pl.handlers.key!(kev, ctx);
    expect(consumed).toBe(true);

    const all = doc.getAllElements();
    expect(all.length).toBe(1);
    expect(all[0].type).toBe('polyline');
    expect((all[0].properties.points as Pt[]).length).toBe(3);
    expect(all[0].x).toBe(15); // BBox-Zentrum min0 max30

    expect(doc.undo()).toBe(true);
    expect(doc.getAllElements().length).toBe(0);
  });

  it('polygon braucht mind. 3 Punkte; ENTER davor meldet Hinweis', () => {
    const { ydoc } = createInMemoryDoc();
    const doc = new CADDocument(ydoc);
    const pg = coreDrawingPlugin.tools!.find((t) => t.manifest.id === 'polygon')!;
    const ctx = makeCtx({ doc });

    pg.handlers.down!(pe(0, 0), ctx);
    pg.handlers.down!(pe(10, 10), ctx);
    const kev = { key: 'Enter', preventDefault: () => {} } as unknown as KeyboardEvent;
    pg.handlers.key!(kev, ctx);   // nur 2 Punkte → abgelehnt
    expect(doc.getAllElements().length).toBe(0);
    expect(ctx.statuses.some((s) => s.includes('mindestens 3'))).toBe(true);

    pg.handlers.down!(pe(20, -5), ctx);
    pg.handlers.key!(kev, ctx);   // jetzt 3 Punkte → ok
    const all = doc.getAllElements();
    expect(all.length).toBe(1);
    expect(all[0].type).toBe('polygon');
    expect((all[0].properties.points as Pt[]).length).toBe(3);
  });
});

describe('A4.4 pilot: annotate tools', () => {
  it('dimension: down→up committet mit x1..y2-Properties; undo entfernt', () => {
    const { ydoc } = createInMemoryDoc();
    const doc = new CADDocument(ydoc);
    const ctx = makeCtx({ doc });
    const dim = coreAnnotatePlugin.tools!.find((t) => t.manifest.id === 'dimension')!;

    dim.handlers.down!(pe(0, 0), ctx);
    dim.handlers.move!(pe(60, 0), ctx);   // Preview war da
    expect(ctx.previews.length).toBe(1);
    dim.handlers.up!(pe(60, 0), ctx);

    const all = doc.getAllElements();
    expect(all.length).toBe(1);
    expect(all[0].type).toBe('dimension');
    expect(all[0].x).toBe(30);                     // Mitte
    expect(all[0].properties.x2).toBe(60);
    expect(all[0].width).toBeCloseTo(60);          // dist als Breite wie Legacy

    expect(doc.undo()).toBe(true);
    expect(doc.getAllElements().length).toBe(0);
  });

  it('leader: übernimmt Text/fontSize-Konvention aus Legacy', () => {
    const { ydoc } = createInMemoryDoc();
    const doc = new CADDocument(ydoc);
    const ctx = makeCtx({ doc });
    const leader = coreAnnotatePlugin.tools!.find((t) => t.manifest.id === 'leader')!;

    leader.handlers.down!(pe(10, 20), ctx);
    leader.handlers.up!(pe(80, 90), ctx);

    const all = doc.getAllElements();
    expect(all.length).toBe(1);
    expect(all[0].type).toBe('leader');
    expect(all[0].properties.x1).toBe(10);
    expect(all[0].properties.y2).toBe(90);
    expect(all[0].properties.text).toBe('');
    expect(all[0].properties.fontSize).toBe(12);
  });

  it('text: Einzelklick platziert leeres Textelement mit fontSize-Option', () => {
    const { ydoc } = createInMemoryDoc();
    const doc = new CADDocument(ydoc);
    const ctx = makeCtx({ doc, options: { fontSize: 18 } });
    const txt = coreAnnotatePlugin.tools!.find((t) => t.manifest.id === 'text')!;

    txt.handlers.down!(pe(40, 70), ctx);   // kein up nötig — single-point tool

    const all = doc.getAllElements();
    expect(all.length).toBe(1);
    expect(all[0].type).toBe('text');
    expect(all[0].x).toBe(40);
    expect(all[0].y).toBe(70);
    expect(all[0].width).toBe(100);        // Legacy-Default-BBox
    expect(all[0].properties.fontSize).toBe(18); // aus options statt Default 12
    expect(all[0].properties.text).toBe('');
  });
});

describe('A4.5 pilot: revcloud tool', () => {
  it('committet per ENTER ab 3 Punkten mit Legacy-Konvention arcHeight=8', () => {
    const { ydoc } = createInMemoryDoc();
    const doc = new CADDocument(ydoc);
    const ctx = makeCtx({ doc });
    const cloud = coreDrawingPlugin.tools!.find((t) => t.manifest.id === 'revcloud')!;

    cloud.handlers.down!(pe(0, 0), ctx);
    cloud.handlers.down!(pe(100, 0), ctx);
    cloud.handlers.down!(pe(100, 50), ctx);
    const kev = { key: 'Enter', preventDefault: () => {} } as unknown as KeyboardEvent;
    const consumed = cloud.handlers.key!(kev, ctx);
    expect(consumed).toBe(true);

    const all = doc.getAllElements();
    expect(all.length).toBe(1);
    expect(all[0].type).toBe('revcloud');
    expect((all[0].properties.points as Pt[]).length).toBe(3);
    expect(all[0].properties.arcHeight).toBe(8);   // Legacy-Konvention
    expect(all[0].properties.fill).toBe('none');

    expect(doc.undo()).toBe(true);
    expect(doc.getAllElements().length).toBe(0);
  });
});

describe('A4.5 pilot: measure tool', () => {
  it('2 Klicks zeigen Distanz+Winkel im Status; erzeugt KEIN Element', () => {
    const { ydoc } = createInMemoryDoc();
    const doc = new CADDocument(ydoc);
    const ctx = makeCtx({ doc });
    const meas = coreMeasurePlugin.tools!.find((t) => t.manifest.id === 'measure')!;

    meas.handlers.down!(pe(0, 0), ctx);
    expect(ctx.statuses.some((s) => s.includes('Endpunkt'))).toBe(true);

    meas.handlers.down!(pe(30, 40), ctx);   // dist=50, angle≈53.13°
    const last = ctx.statuses[ctx.statuses.length - 1];
    expect(last).toContain('distance:');
    expect(last).toContain('angle:');
    expect(last).toContain('53.1');          // atan2(40,30)≈53.13°
    // KernLegacy-Verhalten: Messung erzeugt kein Element
    expect(doc.getAllElements().length).toBe(0);
  });
});

describe('A4.5 pilot: hatch tool', () => {
  it('setzt hatch-Properties via updateElement; undo macht rückgängig', () => {
    const { ydoc } = createInMemoryDoc();
    const doc = new CADDocument(ydoc);
    // Seed-Rect im Doc, das beim hitTest zurückkommt:
    const rectEl = { id: 'r1', type: 'rect', layerId: 'l', x: 50, y: 50, width: 10, height: 10, properties: {} } as unknown as CADElement;
    doc.addElement(rectEl);
    const bridge = {
      getIds: () => [],
      setIds: () => {},
      hitTest: () => rectEl,
    };
    const ctx = makeCtx({ doc, selection: bridge, options: { hatchPattern: 'cross', hatchSpacing: 12 } });
    const hatch = coreModifyPlugin.tools!.find((t) => t.manifest.id === 'hatch')!;

    hatch.handlers.down!(pe(50, 50), ctx);

    const updated = doc.getElement('r1')!;
    expect(updated.properties.hatch).toBe(true);
    expect(updated.properties.hatchPattern).toBe('cross');   // aus Options
    expect(updated.properties.hatchSpacing).toBe(12);

    expect(doc.undo()).toBe(true);  // A2b-Update ist selbst Undo-Schritt
    expect(doc.getElement('r1')!.properties.hatch).toBeUndefined();
  });

  it('lehnt offene Elementtypen (line) mit Hinweis ab', () => {
    const { ydoc } = createInMemoryDoc();
    const doc = new CADDocument(ydoc);
    const lineEl = { id: 'l1', type: 'line', layerId: 'l', x: 0, y: 0, width: 5, height: 5, properties: { x1: 0, y1: 0, x2: 5, y2: 5 } } as unknown as CADElement;
    doc.addElement(lineEl);
    const bridge = { getIds: () => [], setIds: () => {}, hitTest: () => lineEl };
    const ctx = makeCtx({ doc, selection: bridge });
    const hatch = coreModifyPlugin.tools!.find((t) => t.manifest.id === 'hatch')!;

    hatch.handlers.down!(pe(2, 2), ctx);
    expect(doc.getElement('l1')!.properties.hatch).toBeUndefined(); // nichts geändert
    expect(ctx.statuses.some((s) => s.includes('rect/circle/polygon'))).toBe(true);
  });
});

describe('A4.9 pilot: event tools', () => {
  it('chair platziert Einzel-Element per Klick', () => {
    const { ydoc } = createInMemoryDoc();
    const doc = new CADDocument(ydoc);
    const ctx = makeCtx({ doc });
    const chair = eventToolsV2Plugin.tools!.find((t) => t.manifest.id === 'chair')!;

    chair.handlers.down!(pe(100, 200), ctx);
    const all = doc.getAllElements();
    expect(all.length).toBe(1);
    expect(all[0].type).toBe('chair');
    expect(all[0].x).toBe(100);
    expect(all[0].y).toBe(200);
  });

  it('seating-block erzeugt rows×cols Elemente in EINER Transaktion (ein undo = ganzer Block weg)', () => {
    const { ydoc } = createInMemoryDoc();
    const doc = new CADDocument(ydoc);
    const ctx = makeCtx({ doc });
    const block = eventToolsV2Plugin.tools!.find((t) => t.manifest.id === 'seating-block')!;

    block.handlers.down!(pe(0, 0), ctx);   // Legacy-Default: rows=3, cols=8
    const all = doc.getAllElements();
    expect(all.length).toBeGreaterThan(1);  // Multi-Element-Satz
    expect(all.every((e) => e.type === 'chair')).toBe(true);

    // BUG-1-Regressionsschutz: alle Reihen im Block haben eigene rowIds
    const rowIds = new Set(all.map((e) => e.properties.rowId));
    expect(rowIds.size).toBeGreaterThanOrEqual(3);

    // Kern-Akzeptanz: EIN undo entfernt den GANZEN Block
    expect(doc.undo()).toBe(true);
    expect(doc.getAllElements().length).toBe(0);
  });

  it('seating-row platziert mehrere Stühle mit gemeinsamer rowId; undo entfernt Reihe', () => {
    const { ydoc } = createInMemoryDoc();
    const doc = new CADDocument(ydoc);
    const ctx = makeCtx({ doc });
    const row = eventToolsV2Plugin.tools!.find((t) => t.manifest.id === 'seating-row')!;

    row.handlers.down!(pe(0, 0), ctx);
    const all = doc.getAllElements();
    expect(all.length).toBeGreaterThanOrEqual(2);
    const rowIds = new Set(all.map((e) => e.properties.rowId));
    expect(rowIds.size).toBe(1);            // eine Reihe → EINE rowId

    expect(doc.undo()).toBe(true);
    expect(doc.getAllElements().length).toBe(0);
  });
});

describe('A4.6 pilot: move/copy tools', () => {
  it('move verschiebt selektierte Elemente in EINER Transaktion (undo entfernt Versatz)', () => {
    const { ydoc } = createInMemoryDoc();
    const doc = new CADDocument(ydoc);
    doc.addElement(makeEl('m1'));
    doc.addElement(makeEl('m2'));
    let selIds = ['m1', 'm2'];
    const bridge = {
      getIds: () => selIds,
      setIds: (ids: string[]) => {
        selIds = ids;
      },
      hitTest: () => null,
    };
    const ctx = makeCtx({ doc, selection: bridge });
    const move = coreModifyPlugin.tools!.find((t) => t.manifest.id === 'move')!;
    const origM1x = doc.getElement('m1')!.x;
    const origY = doc.getElement('m1')!.y;

    move.handlers.down!(pe(0, 0), ctx);   // Basispunkt
    move.handlers.down!(pe(50, -20), ctx); // Zielklick → Commit

    expect(doc.getElement('m1')!.x).toBe(origM1x + 50);
    expect(doc.getElement('m2')!.y).toBe(origY - 20);
    // EINE Transaktion für beide → ein undo stellt beide wieder her:
    expect(doc.undo()).toBe(true);
    expect(doc.getElement('m1')!.x).toBe(origM1x);
    expect(doc.getElement('m2')!.y).toBe(origY);
  });

  it('copy erzeugt neue Elemente (IDs neu) ohne Original zu veraendern', () => {
    const { ydoc } = createInMemoryDoc();
    const doc = new CADDocument(ydoc);
    doc.addElement(makeEl('o1'));
    let selIds = ['o1'];
    const bridge = {
      getIds: () => selIds,
      setIds: (ids: string[]) => {
        selIds = ids;
      },
      hitTest: () => null,
    };
    const ctx = makeCtx({ doc, selection: bridge });
    const copy = coreModifyPlugin.tools!.find((t) => t.manifest.id === 'copy')!;

    copy.handlers.down!(pe(0, 0), ctx);
    copy.handlers.down!(pe(100, 100), ctx);

    const all = doc.getAllElements();
    expect(all.length).toBe(2);              // Original + Kopie
    expect(all[0].id).toBe('o1');            // Original unberührt
    expect(all[0].x).not.toBe(all[1].x);     // Kopie versetzt
    expect(all[1].id).not.toBe('o1');        // neue ID
    expect(all[1].type).toBe(all[0].type);   // gleicher Typ

    expect(doc.undo()).toBe(true);
    expect(doc.getAllElements().length).toBe(1); // nur Original bleibt
  });

  it('Komfort: bei leerer Selektion wird Element unter Klick auto-gewählt', () => {
    const { ydoc } = createInMemoryDoc();
    const doc = new CADDocument(ydoc);
    const target = makeEl('auto');
    target.x = 10;
    target.y = 10;
    doc.addElement(target);
    let selIds2: string[] = [];
    const bridge = {
      getIds: () => selIds2,
      setIds: (ids: string[]) => {
        selIds2 = ids;
      },
      hitTest: () => target,
    };
    const ctx = makeCtx({ doc, selection: bridge });
    const move = coreModifyPlugin.tools!.find((t) => t.manifest.id === 'move')!;

    move.handlers.down!(pe(10, 10), ctx);   // Basis + Auto-Select
    expect(selIds2).toEqual(['auto']);
    move.handlers.down!(pe(30, 30), ctx);   // Zielklick (Δ=+20)

    expect(doc.undo()).toBe(true);
    expect(doc.getAllElements().length).toBe(1);
  });
});

describe('A4.10 pilot: geometry tools', () => {
  function makeLineEl(id: string): CADElement {
    return {
      id,
      type: 'line',
      layerId: 'l',
      x: 100,
      y: 0,
      width: 200,
      height: 0,
      properties: { x1: 0, y1: 0, x2: 200, y2: 0 },
    } as unknown as CADElement;
  }

  function makeCircleEl(id: string): CADElement {
    return {
      id,
      type: 'circle',
      layerId: 'l',
      x: 100,
      y: 0,
      width: 80,
      height: 80,
      properties: { radius: 40 },
    } as unknown as CADElement;
  }

  it('trim: Kante+Ziel kürzt die Linie am Schnittpunkt; undo stellt her', () => {
    const { ydoc } = createInMemoryDoc();
    const doc = new CADDocument(ydoc);
    const boundary = makeCircleEl('bnd');
    const target = makeLineEl('tgt');
    doc.addElement(boundary);
    doc.addElement(target);

    // Sequenzieller Brücken-HitTest: 1. Klick → boundary, 2. Klick → target
    const pickQueue = [boundary, target];
    let pickIdx = 0;
    const bridge = {
      getIds: () => [] as string[],
      setIds: () => {},
      hitTest: () => pickQueue[Math.min(pickIdx++, pickQueue.length - 1)],
    };
    const ctx = makeCtx({ doc, selection: bridge });
    const trim = coreModifyPlugin.tools!.find((t) => t.manifest.id === 'trim')!;

    trim.handlers.down!(pe(140, 0), ctx);  // Kante
    trim.handlers.down!(pe(180, 0), ctx);  // Ziel-Linie rechts vom Kreis

    const trimmed = doc.getElement('tgt')!;
    expect(trimmed.properties.x2).toBeLessThan(200);       // gekürzt
    // Legacy-Semantik: das NÄHERE Ende wird auf den ERSTEN Schnittpunkt
    // gesetzt (findIntersection wählt den nächsten zu p1 → x=60):
    expect(Math.abs(trimmed.properties.x2 as number)).toBeCloseTo(60); // Schnitt bei x=140

    expect(doc.undo()).toBe(true);
    expect(doc.getElement('tgt')!.properties.x2).toBe(200);
  });

  it('extend: Linie wird zur Kante hin verlängert', () => {
    const { ydoc } = createInMemoryDoc();
    const doc = new CADDocument(ydoc);
    // kurze Linie (10→50); Kreis (100,0,r=40) hat Schnitte bei x=60/140
    // → Extend muss das nahe Ende x2 auf 60 strecken
    const boundary = makeCircleEl('bnd');
    const shortLine = {
      id: 'sl', type: 'line', layerId: 'l', x: 30, y: 0,
      width: 40, height: 0,
      properties: { x1: 10, y1: 0, x2: 50, y2: 0 },
    } as unknown as CADElement;
    doc.addElement(boundary);
    doc.addElement(shortLine);

    const pickQueue = [boundary, shortLine];
    let pickIdx = 0;
    const bridge = {
      getIds: () => [] as string[],
      setIds: () => {},
      hitTest: () => pickQueue[Math.min(pickIdx++, pickQueue.length - 1)],
    };
    const ctx = makeCtx({ doc, selection: bridge });
    const extend = coreModifyPlugin.tools!.find((t) => t.manifest.id === 'extend')!;

    extend.handlers.down!(pe(100, 40), ctx);
    extend.handlers.down!(pe(45, 0), ctx);

    const ext = doc.getElement('sl')!;
    // Extend richtet das nahe Ende exakt auf den Schnittpunkt aus:
    expect(ext.properties.x2).toBeCloseTo(60);

    expect(doc.undo()).toBe(true);
    expect(doc.getElement('sl')!.properties.x2).toBe(50); // Original-Länge
  });
});

describe('A4.7 pilot: transform tools', () => {
  it('rotate dreht um Pivot des ersten Elements; ein undo stellt zurück', () => {
    const { ydoc } = createInMemoryDoc();
    const doc = new CADDocument(ydoc);
    const rotEl = makeEl('r1');
    doc.addElement(rotEl);
    let selIds: string[] = ['r1'];
    const bridge = {
      getIds: () => selIds,
      setIds: (ids: string[]) => { selIds = ids; },
      hitTest: () => null,
    };
    const ctx = makeCtx({ doc, selection: bridge });
    const rotate = coreModifyPlugin.tools!.find((t) => t.manifest.id === 'rotate')!;

    // Basispunkt rechts vom Zentrum (0°-Richtung), Element x=10
    rotate.handlers.down!(pe(60, 10), ctx);
    // Referenzklick oben → Δwinkel ≈ +90° (CCW)
    rotate.handlers.down!(pe(10, 60), ctx);

    expect(doc.undo()).toBe(true);
    expect(doc.getAllElements().length).toBe(1);
  });

  it('scale vergrößert width/height um Faktor dist(pivot,zweiteKlick)/dist(pivot,basis)', () => {
    const { ydoc } = createInMemoryDoc();
    const doc = new CADDocument(ydoc);
    const sq = makeEl('s1');
    sq.width = 40;
    sq.height = 40;
    sq.x = 0;
    sq.y = 0;
    doc.addElement(sq);
    let selIds: string[] = ['s1'];
    const bridge = {
      getIds: () => selIds,
      setIds: (ids: string[]) => { selIds = ids; },
      hitTest: () => null,
    };
    const ctx = makeCtx({ doc, selection: bridge });
    const scale = coreModifyPlugin.tools!.find((t) => t.manifest.id === 'scale')!;

    // Basis bei Distanz 50 vom Pivot, Ziel bei 100 → Faktor 2
    scale.handlers.down!(pe(50, 0), ctx);
    scale.handlers.down!(pe(100, 0), ctx);

    expect(doc.getElement('s1')!.width).toBeCloseTo(80);   // 40×2
    expect(doc.getElement('s1')!.height).toBeCloseTo(80);

    expect(doc.undo()).toBe(true);
    expect(doc.getElement('s1')!.width).toBeCloseTo(40);
  });

  it('mirror spiegelt Element an Achse basis→referenz', () => {
    const { ydoc } = createInMemoryDoc();
    const doc = new CADDocument(ydoc);
    const el = makeEl('mi');
    el.x = 30;
    el.y = 0;
    doc.addElement(el);
    let selIds: string[] = ['mi'];
    const bridge = {
      getIds: () => selIds,
      setIds: (ids: string[]) => { selIds = ids; },
      hitTest: () => null,
    };
    const ctx = makeCtx({ doc, selection: bridge });
    const mirror = coreModifyPlugin.tools!.find((t) => t.manifest.id === 'mirror')!;

    // Spiegelachse = Y-Achse (basis (0,0)→ref (0,100)): Punkt (30,0)→(−30,0)
    mirror.handlers.down!(pe(0, 0), ctx);
    mirror.handlers.down!(pe(0, 100), ctx);

    const mirrored = doc.getElement('mi')!;
    expect(mirrored.x).toBeLessThan(0);        // jenseits der Achse
    expect(Math.abs(mirrored.x)).toBeGreaterThanOrEqual(29); // ~spiegelsymmetrisch
    expect(doc.undo()).toBe(true);
  });
});

describe('A4.8 pilot: delete tool', () => {
  it('löscht alle selektierten Elemente in EINER Transaktion; undo stellt her', () => {
    const { ydoc } = createInMemoryDoc();
    const doc = new CADDocument(ydoc);
    doc.addElement(makeEl('d1'));
    doc.addElement(makeEl('d2'));
    doc.addElement(makeEl('keep'));
    let selIds: string[] = ['d1', 'd2'];
    const bridge = {
      getIds: () => selIds,
      setIds: (ids: string[]) => { selIds = ids; },
      hitTest: () => null,
    };
    const ctx = makeCtx({ doc, selection: bridge });
    const del = coreModifyPlugin.tools!.find((t) => t.manifest.id === 'delete')!;

    del.handlers.down!(pe(0, 0), ctx);
    const remaining = doc.getAllElements().map((e) => e.id);
    expect(remaining).toEqual(['keep']);

    expect(doc.undo()).toBe(true);
    expect(doc.getAllElements().length).toBe(3);
  });

  it('Direktklick ohne Selektion löscht getroffenes Element', () => {
    const { ydoc } = createInMemoryDoc();
    const doc = new CADDocument(ydoc);
    const el = makeEl('hitme');
    el.x = 20;
    el.y = 20;
    doc.addElement(el);
    const bridge = {
      getIds: () => [] as string[],
      setIds: () => {},
      hitTest: () => el,
    };
    const ctx = makeCtx({ doc, selection: bridge });
    const del = coreModifyPlugin.tools!.find((t) => t.manifest.id === 'delete')!;

    del.handlers.down!(pe(20, 20), ctx);
    expect(doc.getAllElements().length).toBe(0);
  });
});

describe('A4.8 pilot: offset tool', () => {
  it('erzeugt Versatz-Kopie mit Seitenparameter; Original bleibt', () => {
    const { ydoc } = createInMemoryDoc();
    const doc = new CADDocument(ydoc);
    const line = {
      id: 'src1', type: 'line', layerId: 'l', x: 50, y: 0,
      width: 100, height: 0,
      properties: { x1: 0, y1: 0, x2: 100, y2: 0 },
    } as unknown as CADElement;
    doc.addElement(line);
    let selIds: string[] = [];
    const bridge = {
      getIds: () => selIds,
      setIds: (ids: string[]) => { selIds = ids; },
      hitTest: () => line,
    };
    const ctx = makeCtx({ doc, selection: bridge });
    const off = coreModifyPlugin.tools!.find((t) => t.manifest.id === 'offset')!;

    off.handlers.down!(pe(50, 0), ctx);   // Klick1: Quelle wählen (Basis)
    off.handlers.down!(pe(50, -30), ctx); // Klick2: Versatz nach oben (side=-1)

    const all = doc.getAllElements();
    expect(all.length).toBe(2);            // Original + Kopie
    expect(all[0].id).toBe('src1');        // Original unberührt
    expect(all[1].id.startsWith('off_')).toBe(true);
    // side=-1 bei Rechtslaufender Linie → nach OBEN (y kleiner):
    expect(all[1].properties.y1).toBe(-30);
    expect(all[1].properties.y2).toBe(-30);
    expect(all[1].properties.x1).toBe(0);  // x bleibt

    expect(doc.undo()).toBe(true);
    expect(doc.getAllElements().length).toBe(1);
  });
});

describe('A3 pilot: select tool', () => {
  function makeBridge(elements: CADElement[]) {
    let ids: string[] = [];
    return {
      bridge: {
        getIds: () => ids,
        setIds: (next: string[]) => {
          ids = next;
        },
        hitTest: (wx: number, wy: number, tol: number): CADElement | null =>
          elements.find((el) => Math.abs(el.x - wx) <= tol && Math.abs(el.y - wy) <= tol) ?? null,
      },
      getIds: () => ids,
    };
  }

  it('wählt getroffenes Element ohne Modifier exklusiv', () => {
    const els = [makeEl('a'), makeEl('b')];
    els[0].x = 10; els[0].y = 10;
    els[1].x = 500; els[1].y = 500;
    const { bridge, getIds } = makeBridge(els);
    const ctx = makeCtx({ selection: bridge });

    selectTool.handlers.down!(pe(10, 10), ctx);
    expect(getIds()).toEqual(['a']);

    // Klick auf b ohne Shift ersetzt Selektion
    selectTool.handlers.down!(pe(500, 500), ctx);
    expect(getIds()).toEqual(['b']);
  });

  it('Shift addiert, Ctrl subtrahiert', () => {
    const els = [makeEl('a'), makeEl('b'), makeEl('c')];
    els[0].x = 10; els[0].y = 10;
    els[1].x = 50; els[1].y = 50;
    els[2].x = 90; els[2].y = 90;
    const { bridge, getIds } = makeBridge(els);
    const ctx = makeCtx({ selection: bridge });

    selectTool.handlers.down!(pe(10, 10), ctx);
    expect(getIds()).toEqual(['a']);

    selectTool.handlers.down!(pe(50, 50, { shift: true }), ctx);
    expect(getIds().sort()).toEqual(['a', 'b']);

    selectTool.handlers.down!(pe(90, 90, { shift: true }), ctx);
    expect(getIds().sort()).toEqual(['a', 'b', 'c']);

    selectTool.handlers.down!(pe(50, 50, { ctrl: true }), ctx);
    expect(getIds().sort()).toEqual(['a', 'c']);
  });

  it('Leerklick ohne Modifier leert die Selektion; Plugin tagged basic', () => {
    const els = [makeEl('a')];
    els[0].x = 10; els[0].y = 10;
    const { bridge, getIds } = makeBridge(els);
    const ctx = makeCtx({ selection: bridge });

    selectTool.handlers.down!(pe(10, 10), ctx);
    expect(getIds()).toEqual(['a']);
    selectTool.handlers.down!(pe(999, 999), ctx);
    expect(getIds()).toEqual([]);

    expect(coreModifyPlugin.manifest.enabledByDefault).toBe(true);
    const sel = coreModifyPlugin.tools?.find((t) => t.manifest.id === 'select');
    expect(sel?.manifest.tags).toContain('basic');
  });
});

describe('D-Ext: array-rect tool', () => {
  it('vervielfaeltigt Selektion rows×cols in EINER Transaktion', () => {
    const { ydoc } = createInMemoryDoc();
    const doc = new CADDocument(ydoc);
    doc.addElement(makeEl('a1'));
    let selIds: string[] = ['a1'];
    const bridge = {
      getIds: () => selIds,
      setIds: (ids: string[]) => { selIds = ids; },
      hitTest: () => null,
    };
    const ctx = makeCtx({ doc, selection: bridge, options: { rows: 2, cols: 2, dx: 60, dy: 60 } });
    const arr = coreModifyPlugin.tools!.find((t) => t.manifest.id === 'array-rect')!;

    arr.handlers.down!(pe(0, 0), ctx);
    arr.handlers.down!(pe(0, 0), ctx);

    expect(doc.getAllElements().length).toBe(4);
    expect(doc.undo()).toBe(true);
    expect(doc.getAllElements().length).toBe(1);
  });
});

describe('D-Ext: array-polar tool', () => {
  it('verteilt count Kopien gleichmaessig um das Zentrum', () => {
    const { ydoc } = createInMemoryDoc();
    const doc = new CADDocument(ydoc);
    const elem = makeEl('p1');
    elem.x = 100;
    elem.y = 0;
    doc.addElement(elem);
    let selIds: string[] = ['p1'];
    const bridge = {
      getIds: () => selIds,
      setIds: (ids: string[]) => { selIds = ids; },
      hitTest: () => null,
    };
    const ctx = makeCtx({ doc, selection: bridge, options: { count: 4 } });
    const polar = coreModifyPlugin.tools!.find((t) => t.manifest.id === 'array-polar')!;

    polar.handlers.down!(pe(0, 0), ctx);
    polar.handlers.down!(pe(0, 0), ctx);

    const all = doc.getAllElements();
    expect(all.length).toBe(4);
    expect(doc.undo()).toBe(true);
    expect(doc.getAllElements().length).toBe(1);
  });
});