defmodule ToweropsWeb.Api.AgentControllerTest do
  use ToweropsWeb.ConnCase

  import Towerops.AccountsFixtures

  alias Towerops.Agent.InterfaceStat
  alias Towerops.Agent.Metric
  alias Towerops.Agent.MetricBatch
  alias Towerops.Agent.SensorReading
  alias Towerops.Agents
  alias Towerops.Repo
  alias Towerops.Snmp.Device
  alias Towerops.Snmp.Interface
  alias Towerops.Snmp.Sensor

  setup do
    user = user_fixture()

    {:ok, organization} =
      Towerops.Organizations.create_organization(%{name: "Test Org"}, user.id)

    {:ok, agent_token, token} = Agents.create_agent_token(organization.id, "Test Agent")

    %{organization: organization, agent_token: agent_token, token: token}
  end

  describe "GET /api/v1/agent/config" do
    test "requires authentication", %{conn: conn} do
      conn = get(conn, ~p"/api/v1/agent/config")
      assert json_response(conn, 401)
    end

    test "returns config for authenticated agent with no equipment", %{conn: conn, token: token} do
      conn =
        conn
        |> put_req_header("authorization", "Bearer #{token}")
        |> get(~p"/api/v1/agent/config")

      assert %{
               "version" => "1.0",
               "poll_interval_seconds" => 60,
               "equipment" => []
             } = json_response(conn, 200)
    end

    test "returns config with equipment without SNMP device", %{
      conn: conn,
      token: token,
      organization: org,
      agent_token: agent_token
    } do
      {:ok, site} =
        Towerops.Sites.create_site(%{
          name: "Test Site",
          organization_id: org.id
        })

      {:ok, equipment} =
        Towerops.Equipment.create_equipment(%{
          name: "Test Router",
          ip_address: "192.168.1.1",
          snmp_enabled: true,
          snmp_version: "2c",
          snmp_community: "public",
          site_id: site.id
        })

      {:ok, _assignment} = Agents.assign_equipment_to_agent(agent_token.id, equipment.id)

      conn =
        conn
        |> put_req_header("authorization", "Bearer #{token}")
        |> get(~p"/api/v1/agent/config")

      response = json_response(conn, 200)

      assert %{
               "version" => "1.0",
               "poll_interval_seconds" => 60,
               "equipment" => [equipment_config]
             } = response

      assert equipment_config["id"] == equipment.id
      assert equipment_config["sensors"] == []
      assert equipment_config["interfaces"] == []
    end

    test "returns config with assigned equipment", %{
      conn: conn,
      token: token,
      organization: org,
      agent_token: agent_token
    } do
      {:ok, site} =
        Towerops.Sites.create_site(%{
          name: "Test Site",
          organization_id: org.id
        })

      {:ok, equipment} =
        Towerops.Equipment.create_equipment(%{
          name: "Test Router",
          ip_address: "192.168.1.1",
          snmp_enabled: true,
          snmp_version: "2c",
          snmp_community: "public",
          snmp_port: 161,
          check_interval_seconds: 120,
          site_id: site.id
        })

      device =
        %Device{}
        |> Device.changeset(%{
          equipment_id: equipment.id,
          sys_name: "Test Device",
          sys_descr: "Test Description"
        })
        |> Repo.insert!()

      sensor =
        %Sensor{}
        |> Sensor.changeset(%{
          snmp_device_id: device.id,
          sensor_type: "temperature",
          sensor_index: "1",
          sensor_oid: "1.2.3.4"
        })
        |> Repo.insert!()

      interface =
        %Interface{}
        |> Interface.changeset(%{
          snmp_device_id: device.id,
          if_index: 1,
          if_name: "GigabitEthernet0/1"
        })
        |> Repo.insert!()

      {:ok, _assignment} = Agents.assign_equipment_to_agent(agent_token.id, equipment.id)

      conn =
        conn
        |> put_req_header("authorization", "Bearer #{token}")
        |> get(~p"/api/v1/agent/config")

      response = json_response(conn, 200)

      assert %{
               "version" => "1.0",
               "poll_interval_seconds" => 60,
               "equipment" => [equipment_config]
             } = response

      assert equipment_config["id"] == equipment.id
      assert equipment_config["name"] == "Test Router"
      assert equipment_config["ip_address"] == "192.168.1.1"
      assert equipment_config["snmp"]["enabled"] == true
      assert equipment_config["snmp"]["version"] == "2c"
      assert equipment_config["snmp"]["community"] == "public"
      assert equipment_config["snmp"]["port"] == 161
      assert equipment_config["poll_interval_seconds"] == 120

      assert length(equipment_config["sensors"]) == 1
      sensor_config = hd(equipment_config["sensors"])
      assert sensor_config["id"] == sensor.id
      assert sensor_config["type"] == "temperature"
      assert sensor_config["oid"] == "1.2.3.4"

      assert length(equipment_config["interfaces"]) == 1
      interface_config = hd(equipment_config["interfaces"])
      assert interface_config["id"] == interface.id
      assert interface_config["if_index"] == 1
      assert interface_config["if_name"] == "GigabitEthernet0/1"
    end
  end

  describe "POST /api/v1/agent/metrics" do
    test "requires authentication", %{conn: conn} do
      conn = post(conn, ~p"/api/v1/agent/metrics", %{"metrics" => []})
      assert json_response(conn, 401)
    end

    test "accepts valid metrics", %{conn: conn, token: token} do
      metrics = [
        %{
          "type" => "sensor_reading",
          "sensor_id" => Ecto.UUID.generate(),
          "value" => 45.5,
          "status" => "ok",
          "timestamp" => DateTime.to_iso8601(DateTime.utc_now())
        },
        %{
          "type" => "interface_stat",
          "interface_id" => Ecto.UUID.generate(),
          "if_in_octets" => 1_234_567,
          "if_out_octets" => 9_876_543,
          "if_in_errors" => 0,
          "if_out_errors" => 0,
          "if_in_discards" => 0,
          "if_out_discards" => 0,
          "timestamp" => DateTime.to_iso8601(DateTime.utc_now())
        }
      ]

      conn =
        conn
        |> put_req_header("authorization", "Bearer #{token}")
        |> post(~p"/api/v1/agent/metrics", %{"metrics" => metrics})

      assert %{"status" => "accepted", "received" => 2} = json_response(conn, 200)
    end

    test "accepts protobuf metrics", %{conn: conn, token: token} do
      # Create protobuf metrics
      sensor_reading = %SensorReading{
        sensor_id: Ecto.UUID.generate(),
        value: 45.5,
        status: "ok",
        timestamp: DateTime.to_unix(DateTime.utc_now())
      }

      interface_stat = %InterfaceStat{
        interface_id: Ecto.UUID.generate(),
        if_in_octets: 1_234_567,
        if_out_octets: 9_876_543,
        if_in_errors: 0,
        if_out_errors: 0,
        if_in_discards: 0,
        if_out_discards: 0,
        timestamp: DateTime.to_unix(DateTime.utc_now())
      }

      batch = %MetricBatch{
        metrics: [
          %Metric{metric_type: {:sensor_reading, sensor_reading}},
          %Metric{metric_type: {:interface_stat, interface_stat}}
        ]
      }

      # Encode to protobuf binary
      encoded = MetricBatch.encode(batch)

      conn =
        conn
        |> put_req_header("authorization", "Bearer #{token}")
        |> put_req_header("content-type", "application/x-protobuf")
        |> post(~p"/api/v1/agent/metrics", encoded)

      assert %{"status" => "accepted", "received" => 2} = json_response(conn, 200)
    end

    test "handles protobuf metrics with unknown types", %{conn: conn, token: token} do
      # Create metric with unknown type (by using empty metric_type)
      batch = %MetricBatch{
        metrics: [
          %Metric{metric_type: nil}
        ]
      }

      encoded = MetricBatch.encode(batch)

      conn =
        conn
        |> put_req_header("authorization", "Bearer #{token}")
        |> put_req_header("content-type", "application/x-protobuf")
        |> post(~p"/api/v1/agent/metrics", encoded)

      # Unknown types are filtered out, so received count is 0
      assert %{"status" => "accepted", "received" => 0} = json_response(conn, 200)
    end

    test "handles JSON metrics with unknown types", %{conn: conn, token: token} do
      metrics = [
        %{
          "type" => "unknown_type",
          "some_field" => "value"
        }
      ]

      conn =
        conn
        |> put_req_header("authorization", "Bearer #{token}")
        |> post(~p"/api/v1/agent/metrics", %{"metrics" => metrics})

      assert %{"status" => "accepted", "received" => 1} = json_response(conn, 200)
    end

    test "handles metrics with nil timestamp", %{conn: conn, token: token} do
      metrics = [
        %{
          "type" => "sensor_reading",
          "sensor_id" => Ecto.UUID.generate(),
          "value" => 45.5,
          "status" => "ok",
          "timestamp" => nil
        }
      ]

      conn =
        conn
        |> put_req_header("authorization", "Bearer #{token}")
        |> post(~p"/api/v1/agent/metrics", %{"metrics" => metrics})

      assert %{"status" => "accepted", "received" => 1} = json_response(conn, 200)
    end

    test "handles metrics with invalid ISO8601 timestamp", %{conn: conn, token: token} do
      metrics = [
        %{
          "type" => "sensor_reading",
          "sensor_id" => Ecto.UUID.generate(),
          "value" => 45.5,
          "status" => "ok",
          "timestamp" => "invalid-date-string"
        }
      ]

      conn =
        conn
        |> put_req_header("authorization", "Bearer #{token}")
        |> post(~p"/api/v1/agent/metrics", %{"metrics" => metrics})

      assert %{"status" => "accepted", "received" => 1} = json_response(conn, 200)
    end
  end

  describe "POST /api/v1/agent/heartbeat" do
    test "requires authentication", %{conn: conn} do
      conn = post(conn, ~p"/api/v1/agent/heartbeat", %{})
      assert json_response(conn, 401)
    end

    test "updates heartbeat with metadata", %{
      conn: conn,
      token: token,
      agent_token: agent_token
    } do
      conn =
        conn
        |> put_req_header("authorization", "Bearer #{token}")
        |> post(~p"/api/v1/agent/heartbeat", %{
          "version" => "0.1.0",
          "hostname" => "test-agent",
          "uptime_seconds" => 3600
        })

      assert %{"status" => "ok"} = json_response(conn, 200)

      # Give the async task time to complete
      Process.sleep(100)

      updated_token = Repo.get!(Agents.AgentToken, agent_token.id)
      assert updated_token.last_seen_at
      assert updated_token.metadata["version"] == "0.1.0"
      assert updated_token.metadata["hostname"] == "test-agent"
      assert updated_token.metadata["uptime_seconds"] == 3600
    end
  end
end