/**
 * core-annotate – Built-in V2-Plugin (Task A4.4).
 *
 * Werkzeuge: text (Platzierung — Inhalt via InlineTextEditor/PropertiesPanel,
 * Bestandskanal onTextEdit bleibt), dimension (2-Punkt linear), leader
 * (2-Punkt Pfeil+Label).
 */
import type { PluginV2, ToolExtensionV2, FullToolContext } from '../../types';
import type { CADElement } from '../../../types/cad.types';
import type { Pt } from '../../../tools/modification/geometry';

const uid = (prefix: string): string =>
  `${prefix}_${Date.now().toString(36)}_${Math.random().toString(36).slice(2, 9)}`;

/** Gemeinsamer 2-Punkt-Sitzungsstart für dimension/leader. */
let twoPointStart: Pt | null = null;

function optsOf(ctx: FullToolContext): { stroke: string; layerId: string } {
  return {
    stroke: (ctx.options.strokeColor as string | undefined) ?? '#e0e0e0',
    layerId: (ctx.options.layerId as string | undefined) ?? 'layer-0',
  };
}

function buildDimension(start: Pt, end: Pt, ctx: FullToolContext): CADElement {
  const o = optsOf(ctx);
  return {
    id: uid('dim'),
    type: 'dimension',
    layerId: o.layerId,
    x: (start.x + end.x) / 2,
    y: (start.y + end.y) / 2,
    width: Math.hypot(end.x - start.x, end.y - start.y), // Legacy: dist als Breite
    height: 20,
    properties: { x1: start.x, y1: start.y, x2: end.x, y2: end.y },
  } as unknown as CADElement;
}

function buildLeader(start: Pt, end: Pt, ctx: FullToolContext): CADElement {
  const o = optsOf(ctx);
  return {
    id: uid('leader'),
    type: 'leader',
    layerId: o.layerId,
    x: end.x,
    y: end.y,
    width: Math.abs(end.x - start.x),
    height: Math.abs(end.y - start.y),
    properties: { x1: start.x, y1: start.y, x2: end.x, y2: end.y, text: '', fontSize: 12, stroke: o.stroke, strokeWidth: 1 },
  } as unknown as CADElement;
}

/** Generischer 2-Punkt-Annotate-Fluss (down→Preview→up commit). */
function make2PointAnnotate(
  id: 'dimension' | 'leader',
  label: string,
  icon: string,
  build: (a: Pt, b: Pt, ctx: FullToolContext) => CADElement,
): ToolExtensionV2 {
  return {
    manifest: { id, label, icon, ribbonTab: 'format', tags: ['basic'] },
    optionsSchema: [{ key: 'strokeColor', label: 'Farbe', type: 'color' }],
    handlers: {
      down(e, ctx) {
        twoPointStart = e.world;
        ctx.setStatus(`${label}: Startpunkt gesetzt – Ende wählen`);
      },
      move(e, ctx) {
        if (!twoPointStart) return;
        ctx.setPreview?.(build(twoPointStart, e.world, ctx as FullToolContext));
      },
      up(e, ctx) {
        const c = ctx as FullToolContext;
        if (!twoPointStart || !c.doc) { twoPointStart = null; return; }
        const el = build(twoPointStart, e.world, c);
        c.doc.transact(() => c.doc!.addElement(el));
        twoPointStart = null;
        ctx.setPreview?.(null);
        ctx.setStatus(`${label} erstellt (${el.id})`);
      },
      cancel(ctx) {
        twoPointStart = null;
        ctx.setPreview?.(null);
        ctx.setStatus(`${label} abgebrochen`);
      },
    },
  };
}

/**
 * text-Werkzeug (A4.4): Klick platziert Textelement mit leerem Inhalt;
 * Bearbeitung läuft über den bestehenden InlineTextEditor/onTextEdit-Kanal.
 */
export const textTool: ToolExtensionV2 = {
  manifest: {
    id: 'text',
    label: 'Text',
    icon: 'T',
    ribbonTab: 'format',
    tags: ['basic'],
    description: 'Text platzieren und über Editor beschriften',
  },
  optionsSchema: [{ key: 'fontSize', label: 'Größe', type: 'number', min: 6, max: 72 }],
  handlers: {
    down(e, ctx) {
      const c = ctx as FullToolContext;
      if (!c.doc) return;
      const layerId = (c.options.layerId as string | undefined) ?? 'layer-0';
      const fontSize = (c.options.fontSize as number | undefined) ?? 12;
      const el = {
        id: uid('text'),
        type: 'text',
        layerId,
        x: e.world.x,
        y: e.world.y,
        width: 100,
        height: 20,
        properties: { text: '', fontSize },
      } as unknown as CADElement;
      c.doc.transact(() => c.doc!.addElement(el));
      ctx.setStatus(`Text platziert (${el.id}) – now via Editor`);
    },
  },
};

export const dimensionTool: ToolExtensionV2 = make2PointAnnotate('dimension', 'Bemaßung', '\u2194', buildDimension);
export const leaderTool: ToolExtensionV2 = make2PointAnnotate('leader', 'Leader', '\u21b1', buildLeader);

/** V2-Plugin: Beschriftung/Bemaßung (A4.4). */
export const coreAnnotatePlugin: PluginV2 = {
  manifest: {
    id: 'core-annotate',
    name: 'Beschriftung (Kern)',
    version: '1.0.0',
    author: 'web-cad team',
    description: 'Text, Bemaßung, Leader (V2).',
    category: 'tools',
    enabledByDefault: true,
  },
  tools: [textTool, dimensionTool, leaderTool],
};