import { isValidColor } from 'src/shared/utils/validator.utils';
import {
  Vec2,
  Line,
  BezierSegment,
  LayerObject,
  Layer,
} from './renderer.interfaces';

export const isValidVec2 = (subject: Vec2) =>
  Array.isArray(subject) &&
  subject.length === 2 &&
  subject.every((entry) => !isNaN(entry));

export const isValidLine = (subject: Line) =>
  // Segments must be array
  Array.isArray(subject.segments) &&
  // Every segment must contain at least a valid end point
  subject.segments.every((segment) => {
    // Check segment vector
    if (segment.start && !isValidVec2(segment.start)) return false;
    if (!segment.end || !isValidVec2(segment.end)) return false;
    // Check bezier vector
    const bezier = segment as BezierSegment;
    if (bezier.startControl && !isValidVec2(bezier.startControl)) return false;
    if (bezier.endControl && !isValidVec2(bezier.endControl)) return false;
    return true;
  }) &&
  // Color must be a valid color value
  isValidColor(subject.color) &&
  // Closed must be a boolean
  (subject.closed == null || typeof subject.closed === 'boolean');

export const isValidLayerObject = (object: LayerObject) =>
  // Must be of correct type
  ['line', 'room', 'curve', 'object'].includes(object.type) &&
  // If has segments, must be a valid line
  (!(object as Line).segments || isValidLine(object as Line)) &&
  // Name must be present
  object.name != null;

export const isValidLayer = (layer: Layer) =>
  // Must have correct color value
  isValidColor(layer.color) &&
  // Must have contents
  Array.isArray(layer.contents) &&
  // Must have valid contents
  layer.contents.every(isValidLayerObject) &&
  // Must be named
  layer.name != null;