/**
 * 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 { 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('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');
  });
});