import type { GridEditorCell, GridZone } from './types'
import { MIN_ROW_HEIGHT } from './gridTableConstants'

/** Dominant non-black color from a cell's word_boxes, or null.
 *  `color_override` takes priority when set. */
export function getCellColor(cell: GridEditorCell | undefined): string | null {
  if (!cell) return null
  // Manual override: explicit color or null (= "clear color bar")
  if (cell.color_override !== undefined) return cell.color_override ?? null
  if (!cell.word_boxes?.length) return null
  for (const wb of cell.word_boxes) {
    if (wb.color_name && wb.color_name !== 'black' && wb.color) {
      return wb.color
    }
  }
  return null
}

/** Compute the rendered height for a row in px. */
export function getRowHeight(
  zone: GridZone,
  rowIndex: number,
  isHeader: boolean,
  avgRowHeightPx: number,
  scale: number,
): number {
  const row = zone.rows.find((r) => r.index === rowIndex)
  if (!row) return Math.max(MIN_ROW_HEIGHT, avgRowHeightPx * scale)

  // Multi-line cells (containing \n): expand height based on line count
  const rowCells = zone.cells.filter((c) => c.row_index === rowIndex)
  const maxLines = Math.max(1, ...rowCells.map((c) => (c.text ?? '').split('\n').length))
  if (maxLines > 1) {
    const lineH = Math.max(MIN_ROW_HEIGHT, avgRowHeightPx * scale)
    return lineH * maxLines
  }

  if (isHeader) {
    const measuredH = row.y_max_px - row.y_min_px
    return Math.max(MIN_ROW_HEIGHT, measuredH * scale)
  }
  return Math.max(MIN_ROW_HEIGHT, avgRowHeightPx * scale)
}