-- assets/table-header-bold.lua
local function bold_blocks(blocks)
  local out = {}
  for _, blk in ipairs(blocks) do
    if blk.t == "Plain" then
      table.insert(out, pandoc.Plain({ pandoc.Strong(blk.content) }))
    elseif blk.t == "Para" then
      table.insert(out, pandoc.Para({ pandoc.Strong(blk.content) }))
    else
      table.insert(out, blk)
    end
  end
  return out
end

function Table(tbl)
  -- 1) Bold header
  if tbl.head and tbl.head.rows then
    for _, row in ipairs(tbl.head.rows) do
      for _, cell in ipairs(row.cells or {}) do
        cell.contents = bold_blocks(cell.contents or {})
      end
    end
  end

  -- 2) Bold các ô bắt đầu bằng "Chủ đề"
  if tbl.bodies then
    for _, body in ipairs(tbl.bodies) do
      if body.body and body.body.rows then
        for _, row in ipairs(body.body.rows) do
          for _, cell in ipairs(row.cells or {}) do
            local txt = pandoc.utils.stringify(cell)
            if txt:match("^[%s]*[Cc][Hh][Uu][^ ]*[ ]*[Dd][Ee][Ee]") then
              cell.contents = bold_blocks(cell.contents or {})
            end
          end
        end
      end
    end
  end

  return tbl
end