import type { Segment, Alignment, Mat3 } from '../types';
import { parseGcode } from '../gcode/parser';
import { projectSegments } from '../geometry/transform';

export interface AppState {
  segments: Segment[];
  alignment: Alignment;
  homography: Mat3 | null;
  loadGcode(text: string): string[];
  setHomography(H: Mat3 | null): void;
  projected(): Segment[];
}

export function createState(): AppState {
  const state: AppState = {
    segments: [],
    alignment: { tx: 0, ty: 0, rot: 0 },
    homography: null,
    loadGcode(text: string): string[] {
      const { segments, warnings } = parseGcode(text);
      state.segments = segments;
      return warnings;
    },
    setHomography(H: Mat3 | null): void {
      state.homography = H;
    },
    projected(): Segment[] {
      if (!state.homography) return [];
      return projectSegments(state.segments, state.alignment, state.homography);
    },
  };
  return state;
}