import type {
  ShapePathFormulasKeys,
  PPTImageElement,
  PPTShapeElement,
  PPTTextElement,
  Slide,
} from '@openmaic/dsl';

export interface ShapeSpec {
  viewBox: [number, number];
  path: string;
  pathFormula?: ShapePathFormulasKeys;
  pptxShapeType?: string;
}

export function plainTextToParagraphHtml(value: string) {
  return `<p>${escapeHtml(value)}</p>`;
}

export function htmlToPlainText(value: string) {
  return value.replace(/<[^>]+>/g, '').trim();
}

export function createDefaultTextElement(id: string): PPTTextElement {
  return {
    id,
    type: 'text',
    left: 120,
    top: 120,
    width: 360,
    height: 72,
    rotate: 0,
    content: '<p>New text</p>',
    defaultFontName: 'Inter',
    defaultColor: '#111827',
    lineHeight: 1.4,
  };
}

export function createDefaultShapeElement(id: string, spec?: ShapeSpec): PPTShapeElement {
  const viewBox = spec?.viewBox ?? ([260, 140] as [number, number]);
  // Picked shapes tend to be square (200x200) in the shape pool — scale to
  // a reasonable canvas width while preserving aspect ratio.
  const width = spec ? 200 : viewBox[0];
  const height = spec ? 200 * (viewBox[1] / viewBox[0]) : viewBox[1];
  return {
    id,
    type: 'shape',
    left: 160,
    top: 160,
    width,
    height,
    rotate: 0,
    viewBox,
    path: spec?.path ?? 'M 0 0 L 260 0 L 260 140 L 0 140 Z',
    pathFormula: spec?.pathFormula,
    fixedRatio: false,
    fill: '#dbeafe',
    outline: {
      width: 2,
      color: '#2563eb',
      style: 'solid',
    },
  };
}

export function createDefaultSlide(id: string): Slide {
  return {
    id,
    viewportSize: 1000,
    viewportRatio: 0.5625, // 16:9
    theme: {
      backgroundColor: '#ffffff',
      themeColors: ['#5b8def', '#8b5cf6', '#10b981', '#f59e0b'],
      fontColor: '#111827',
      fontName: 'Inter',
    },
    elements: [],
    background: { type: 'solid', color: '#ffffff' },
  };
}

export function createDefaultImageElement(id: string, src: string): PPTImageElement {
  return {
    id,
    type: 'image',
    left: 180,
    top: 140,
    width: 360,
    height: 220,
    rotate: 0,
    fixedRatio: true,
    src,
  };
}

function escapeHtml(value: string) {
  return value
    .replace(/&/g, '&amp;')
    .replace(/</g, '&lt;')
    .replace(/>/g, '&gt;')
    .replace(/"/g, '&quot;')
    .replace(/'/g, '&#39;');
}