import type { Frame, WObject } from '@/lib/wysiwyg/schema'

export type Exported = { html: string; css: string; js: string }

function esc(s: string) {
  return s.replace(/&/g, '&amp;').replace(/</g, '&lt;').replace(/>/g, '&gt;').replace(/"/g, '&quot;')
}

function isImage(o: WObject): o is Extract<WObject, { type: 'image' }> { return o.type === 'image' }
function isText(o: WObject): o is Extract<WObject, { type: 'text' }> { return o.type === 'text' }
function isButton(o: WObject): o is Extract<WObject, { type: 'button' }> { return o.type === 'button' }

function renderObject(o: WObject): { html: string; css: string } {
  const baseCss = `#${o.id}{position:absolute;left:${o.x}px;top:${o.y}px;width:${o.width}px;height:${o.height}px;transform:rotate(${o.rotate}deg)}`
  if (isImage(o)) {
    const html = `<img id="${o.id}" src="${esc(o.props.src)}" alt="${esc(o.props.alt || '')}" />`
    return { html, css: baseCss }
  }
  if (isText(o)) {
    const html = `<p id="${o.id}">${esc(o.props.text)}</p>`
    return { html, css: baseCss + `;font-size:${o.props.fontSize}px;color:${o.props.color}` }
  }
  // button minimal
  const label = isButton(o) ? o.props.label : 'Button'
  const href = isButton(o) ? (o.props.href || '#') : '#'
  const html = `<a id="${o.id}" href="${esc(href)}">${esc(label)}</a>`
  return { html, css: baseCss }
}

export function exportFrame(frame: Frame): Exported {
  const piecesHtml: string[] = []
  const piecesCss: string[] = []
  for (const layer of frame.layers) {
    if (!layer.visible) continue
    for (const o of layer.objects) {
      const r = renderObject(o)
      piecesHtml.push(r.html)
      piecesCss.push(r.css)
    }
  }
  const html = `<div class="frame-scale"><div class="frame">${piecesHtml.join('')}</div></div>`
  const css = [
    `.frame{position:relative;width:${frame.width}px;height:${frame.height}px;background:${frame.background}}`,
    `.frame-scale{transform-origin:0 0}`,
    ...piecesCss,
  ].join('\n')
  return { html, css, js: '' }
}