/**
 * Chart node — represents a chart embedded in a graphicFrame element.
 */

import { type RelEntry, resolveRelTarget } from '../../parser/rel-parser'
import type { SafeXmlNode } from '../../parser/xml-parser'
import { type BaseNodeData, parseBaseProps } from './base-node'

export interface ChartNodeData extends BaseNodeData {
  nodeType: 'chart'
  chartPath: string // e.g. "ppt/charts/chart1.xml"
}

/**
 * Parse a graphicFrame containing a chart reference into a ChartNodeData.
 *
 * @param graphicFrame  The graphicFrame XML node
 * @param slideRels     Relationship entries for the containing slide
 * @param slidePath     Full path of the slide (e.g. "ppt/slides/slide1.xml")
 */
export function parseChartNode(
  graphicFrame: SafeXmlNode,
  slideRels: Map<string, RelEntry>,
  slidePath: string
): ChartNodeData | undefined {
  const base = parseBaseProps(graphicFrame)

  // Find chart relationship
  const graphic = graphicFrame.child('graphic')
  const graphicData = graphic.child('graphicData')

  // Find the chart reference - look for c:chart element with r:id
  let chartRId: string | undefined
  for (const child of graphicData.allChildren()) {
    if (child.localName === 'chart') {
      chartRId = child.attr('r:id') || child.attr('id')
      break
    }
  }

  if (!chartRId) return undefined

  const rel = slideRels.get(chartRId)
  if (!rel) return undefined

  // Resolve chart path relative to slide
  const slideDir = slidePath.substring(0, slidePath.lastIndexOf('/'))
  const chartPath = resolveRelTarget(slideDir, rel.target)

  return {
    ...base,
    nodeType: 'chart' as const,
    chartPath,
  }
}