local M = {}

-- NOTE: There is in fact a markdown LSP that can provide symbols. However on
-- buffer open the LSP may not be attached immediately. Before the LSP is ready
-- if the user opens the outline, our own markdown provider will be used. After
-- refreshing/reopening, the provider will then switch to the LSP (if the user
-- has a markdown LSP).
local providers = {
  'outline/providers/nvim-lsp',
  'outline/providers/coc',
  'outline/providers/markdown',
}

_G._outline_current_provider = nil

function M.has_provider()
  local ret = false
  for _, value in ipairs(providers) do
    local provider = require(value)
    if provider.should_use_provider(0) then
      ret = true
      break
    end
  end
  return ret
end

---@param on_symbols function
---@param opts outline.OutlineOpts?
---@return boolean found_provider
function M.request_symbols(on_symbols, opts)
  for _, value in ipairs(providers) do
    local provider = require(value)
    if provider.should_use_provider(0) then
      _G._outline_current_provider = provider
      _G._outline_current_provider.name = value
      provider.request_symbols(on_symbols, opts)
      return true
    end
  end
  return false
end

return M