defmodule ProxmoxAgent.ConfigTest do
  use ExUnit.Case, async: true

  alias ProxmoxAgent.Config

  @fixture Path.expand("../fixtures/agent.toml", __DIR__)

  describe "load/1" do
    test "parses required fields" do
      assert {:ok, cfg} = Config.load(@fixture)
      assert cfg.server_url == "wss://monitor.example.com/socket/websocket"
      assert cfg.token == "test_token_123"
      assert cfg.host_id == "pve-test-01"
      assert cfg.fast_seconds == 15
      assert cfg.medium_seconds == 120
      assert cfg.slow_seconds == 600
    end

    test "returns error for missing file" do
      assert {:error, {:file_read, _}} = Config.load("/does/not/exist.toml")
    end

    test "defaults host_id to system hostname when absent" do
      tmp = Path.join(System.tmp_dir!(), "agent_nohost.toml")

      File.write!(tmp, """
      server_url = "wss://x/socket/websocket"
      token = "t"
      """)

      on_exit(fn -> File.rm(tmp) end)

      assert {:ok, cfg} = Config.load(tmp)
      assert is_binary(cfg.host_id)
      assert cfg.host_id != ""
    end

    test "applies default intervals when [intervals] is absent" do
      tmp = Path.join(System.tmp_dir!(), "agent_nointervals.toml")

      File.write!(tmp, """
      server_url = "wss://x/socket/websocket"
      token = "t"
      host_id = "h"
      """)

      on_exit(fn -> File.rm(tmp) end)

      assert {:ok, cfg} = Config.load(tmp)
      assert cfg.fast_seconds == 30
      assert cfg.medium_seconds == 300
      assert cfg.slow_seconds == 1800
    end

    test "returns error when required keys missing" do
      tmp = Path.join(System.tmp_dir!(), "agent_bad.toml")
      File.write!(tmp, "token = \"t\"\n")
      on_exit(fn -> File.rm(tmp) end)
      assert {:error, {:missing_key, :server_url}} = Config.load(tmp)
    end
  end
end