local build = {}

function build.dir(opts)
  print(vim.inspect(opts))
  local num_fargs = table.maxn(opts.fargs)
  local dir = nil

  for index, arg in ipairs(opts.fargs) do
    print(index, arg)
  end

  if num_fargs == 0 then
    -- Find build directories
    local dirs = build.list_dirs()
    local num_dirs = table.maxn(dirs)

    if num_dirs == 0 then
      vim.cmd.echoerr('no build directories found')

    elseif num_dirs == 1 then
      -- One build directory found, use it
      dir = dirs[1]

    else
      -- TODO: Implement Telescope picker
      -- Prompt user to choose dir with to inputlist
      local choices = {}
      for index, choice in ipairs(dirs) do
        table.insert(choices, tostring(index) .. ': ' .. choice)
      end
      local index = vim.fn.inputlist(choices)
      dir = dirs[index]
      print(' ' .. dir)
    end

  elseif num_fargs == 1 then
    -- Single argument, invoked as :BuildDir <dir>
    dir = opts.fargs[1]

  else
    error('build#dir called with too many arguments')
  end

  if not dir then
    return
  end

  -- TODO: Set build directory
  -- TODO: Post-process compile_commands.json with compdb
end

function build.run(opts)
  print(vim.inspect(opts))
end

function build.list_dirs()
  local dirs = vim.fn.globpath('.', 'build*')
  dirs = vim.fn.substitute(dirs, '\\.\\/', '', 'g')
  return vim.fn.split(dirs)
end

function build.list_targets()
  return {}
end

function build.create_commands()
  local buffer = vim.api.nvim_get_current_buf()

  -- Create :BuildDir command
  vim.api.nvim_buf_create_user_command(buffer, 'BuildDir', build.dir, {
    bang = true, nargs = '?', complete = build.list_dirs,
  })

  -- Create :Build command
  vim.api.nvim_buf_create_user_command(buffer, 'Build', build.run, {
    bang = true, nargs = '*', complete = build.list_targets,
  })
end

return build