defmodule Microwaveprop.Workers.WeatherFetchWorkerTest do
  use Microwaveprop.DataCase, async: true

  alias Microwaveprop.Weather
  alias Microwaveprop.Weather.IemClient
  alias Microwaveprop.Weather.Sounding
  alias Microwaveprop.Weather.SurfaceObservation
  alias Microwaveprop.Workers.WeatherFetchWorker

  defp create_asos_station(_) do
    {:ok, station} =
      Weather.find_or_create_station(%{
        station_code: "KORD",
        station_type: "asos",
        name: "Chicago O'Hare",
        lat: 41.98,
        lon: -87.9
      })

    %{station: station}
  end

  defp create_sounding_station(_) do
    {:ok, station} =
      Weather.find_or_create_station(%{
        station_code: "72451",
        station_type: "sounding",
        name: "Davenport",
        lat: 41.61,
        lon: -90.58
      })

    %{station: station}
  end

  defp asos_csv_body do
    """
    #DEBUG,
    station,valid,tmpf,dwpf,relh,sknt,drct,mslp,alti,skyc1,p01i,wxcodes
    KORD,2026-03-28 18:53,45.0,30.0,55.0,10.0,270,1013.5,29.92,CLR,null,null
    KORD,2026-03-28 19:53,46.0,31.0,54.0,12.0,280,1013.2,29.91,FEW,0.02,RA
    """
  end

  defp raob_json_body do
    %{
      "profiles" => [
        %{
          "valid" => "2026-03-28 12:00:00+00:00",
          "profile" => [
            %{"pres" => 1000.0, "hght" => 200.0, "tmpc" => 15.0, "dwpc" => 10.0, "drct" => 180, "sknt" => 5},
            %{"pres" => 925.0, "hght" => 800.0, "tmpc" => 10.0, "dwpc" => 5.0, "drct" => 200, "sknt" => 10},
            %{"pres" => 850.0, "hght" => 1500.0, "tmpc" => 5.0, "dwpc" => 0.0, "drct" => 220, "sknt" => 15},
            %{"pres" => 700.0, "hght" => 3000.0, "tmpc" => -5.0, "dwpc" => -10.0, "drct" => 240, "sknt" => 25},
            %{"pres" => 500.0, "hght" => 5500.0, "tmpc" => -20.0, "dwpc" => -30.0, "drct" => 260, "sknt" => 40}
          ]
        }
      ]
    }
  end

  describe "ASOS day perform/1" do
    test "fetches full UTC day for one station and upserts returned rows" do
      {:ok, station} =
        Weather.find_or_create_station(%{
          station_code: "KDFW",
          station_type: "asos",
          name: "DFW",
          lat: 32.9,
          lon: -97.0
        })

      Req.Test.stub(IemClient, fn conn ->
        # Assert the worker requested the whole UTC day 2021-08-21.
        qs = URI.decode_query(conn.query_string)
        assert qs["year1"] == "2021"
        assert qs["month1"] == "8"
        assert qs["day1"] == "21"
        assert qs["year2"] == "2021"
        assert qs["day2"] == "21"

        body = """
        station,valid,tmpf,dwpf,relh,sknt,drct,mslp,alti,skyc1,p01i,wxcodes
        KDFW,2021-08-21 00:53,80.0,70.0,71.0,8,180,1012.0,29.90,CLR,null,null
        KDFW,2021-08-21 12:53,85.0,68.0,58.0,10,180,1013.0,29.92,FEW,null,null
        KDFW,2021-08-21 23:53,78.0,69.0,73.0,6,160,1011.0,29.89,SCT,null,null
        """

        Req.Test.text(conn, body)
      end)

      args = %{
        "fetch_type" => "asos_day",
        "station_id" => station.id,
        "station_code" => "KDFW",
        "date" => "2021-08-21"
      }

      assert :ok = WeatherFetchWorker.perform(%Oban.Job{args: args})
      assert Repo.aggregate(SurfaceObservation, :count) == 3
    end

    test "skips fetch when day is already covered" do
      {:ok, station} =
        Weather.find_or_create_station(%{
          station_code: "KDFW",
          station_type: "asos",
          name: "DFW",
          lat: 32.9,
          lon: -97.0
        })

      # Seed a prior observation inside the target day.
      Weather.upsert_surface_observation(station, %{
        observed_at: ~U[2021-08-21 12:00:00Z],
        temp_f: 85.0
      })

      Req.Test.stub(IemClient, fn conn ->
        Plug.Conn.send_resp(conn, 500, "should not be called")
      end)

      args = %{
        "fetch_type" => "asos_day",
        "station_id" => station.id,
        "station_code" => "KDFW",
        "date" => "2021-08-21"
      }

      assert :ok = WeatherFetchWorker.perform(%Oban.Job{args: args})
      # Still only the seeded row — no fetch happened.
      assert Repo.aggregate(SurfaceObservation, :count) == 1
    end
  end

  describe "ASOS batch perform/1" do
    test "fetches one URL covering all stations and ingests per-station rows" do
      {:ok, s1} =
        Weather.find_or_create_station(%{
          station_code: "KDFW",
          station_type: "asos",
          name: "DFW",
          lat: 32.9,
          lon: -97.0
        })

      {:ok, s2} =
        Weather.find_or_create_station(%{
          station_code: "KFTW",
          station_type: "asos",
          name: "FTW",
          lat: 32.82,
          lon: -97.36
        })

      {:ok, s3} =
        Weather.find_or_create_station(%{
          station_code: "KAFW",
          station_type: "asos",
          name: "AFW",
          lat: 32.98,
          lon: -97.32
        })

      # One HTTP call returns rows for s1 + s2; s3 is absent → should stub.
      Req.Test.stub(IemClient, fn conn ->
        body = """
        #DEBUG
        station,valid,tmpf,dwpf,relh,sknt,drct,mslp,alti,skyc1,p01i,wxcodes
        KDFW,2026-03-28 18:53,75.0,55.0,49.0,12,180,1013.2,29.92,SCT,null,null
        KDFW,2026-03-28 19:53,76.0,54.0,46.0,10,190,1013.0,29.91,FEW,null,null
        KFTW,2026-03-28 18:55,73.0,53.0,49.0,10,190,1013.0,29.91,FEW,null,null
        """

        Req.Test.text(conn, body)
      end)

      args = %{
        "fetch_type" => "asos_batch",
        "station_ids" => [s1.id, s2.id, s3.id],
        "station_codes" => ["KDFW", "KFTW", "KAFW"],
        "start_dt" => "2026-03-28T16:00:00Z",
        "end_dt" => "2026-03-28T20:00:00Z"
      }

      assert :ok = WeatherFetchWorker.perform(%Oban.Job{args: args})
      # 2 real rows for KDFW + 1 for KFTW + 1 stub for KAFW = 4
      assert Repo.aggregate(SurfaceObservation, :count) == 4
    end
  end

  describe "ASOS perform/1" do
    setup :create_asos_station

    test "fetches and upserts surface observations", %{station: station} do
      Req.Test.stub(IemClient, fn conn ->
        Req.Test.text(conn, asos_csv_body())
      end)

      args = %{
        "fetch_type" => "asos",
        "station_id" => station.id,
        "station_code" => "KORD",
        "start_dt" => "2026-03-28T16:53:00Z",
        "end_dt" => "2026-03-28T20:53:00Z"
      }

      assert :ok = WeatherFetchWorker.perform(%Oban.Job{args: args})
      assert Repo.aggregate(SurfaceObservation, :count) == 2
    end

    test "skips fetch when observations already exist", %{station: station} do
      start_dt = ~U[2026-03-28 16:53:00Z]
      end_dt = ~U[2026-03-28 20:53:00Z]

      Weather.upsert_surface_observation(station, %{
        observed_at: ~U[2026-03-28 18:53:00Z],
        temp_f: 45.0,
        dewpoint_f: 30.0
      })

      # Stub should NOT be called — if it is, it will raise
      Req.Test.stub(IemClient, fn conn ->
        Plug.Conn.send_resp(conn, 500, "Should not be called")
      end)

      args = %{
        "fetch_type" => "asos",
        "station_id" => station.id,
        "station_code" => "KORD",
        "start_dt" => DateTime.to_iso8601(start_dt),
        "end_dt" => DateTime.to_iso8601(end_dt)
      }

      assert :ok = WeatherFetchWorker.perform(%Oban.Job{args: args})
      assert Repo.aggregate(SurfaceObservation, :count) == 1
    end

    test "returns error on HTTP failure to trigger Oban retry", %{station: station} do
      Req.Test.stub(IemClient, fn conn ->
        Plug.Conn.send_resp(conn, 503, "Service Unavailable")
      end)

      args = %{
        "fetch_type" => "asos",
        "station_id" => station.id,
        "station_code" => "KORD",
        "start_dt" => "2026-03-28T16:53:00Z",
        "end_dt" => "2026-03-28T20:53:00Z"
      }

      assert {:error, "IEM ASOS HTTP 503"} = WeatherFetchWorker.perform(%Oban.Job{args: args})
    end

    test "stores stub observation on empty ASOS data so backfill doesn't retry", %{station: station} do
      Req.Test.stub(IemClient, fn conn ->
        body = """
        #DEBUG,
        station,valid,tmpf,dwpf,relh,sknt,drct,mslp,alti,skyc1,p01i,wxcodes
        """

        Plug.Conn.send_resp(conn, 200, body)
      end)

      args = %{
        "fetch_type" => "asos",
        "station_id" => station.id,
        "station_code" => "KORD",
        "start_dt" => "2026-03-28T16:53:00Z",
        "end_dt" => "2026-03-28T20:53:00Z"
      }

      assert :ok = WeatherFetchWorker.perform(%Oban.Job{args: args})
      assert Repo.aggregate(SurfaceObservation, :count) == 1

      obs = Repo.one!(SurfaceObservation)
      assert obs.station_id == station.id
      # All weather fields nil — it's a stub
      assert is_nil(obs.temp_f)
    end

    test "returns :ok when station no longer exists" do
      Req.Test.stub(IemClient, fn conn ->
        Plug.Conn.send_resp(conn, 500, "Should not be called")
      end)

      args = %{
        "fetch_type" => "asos",
        "station_id" => Ecto.UUID.generate(),
        "station_code" => "GONE",
        "start_dt" => "2026-03-28T16:53:00Z",
        "end_dt" => "2026-03-28T20:53:00Z"
      }

      assert :ok = WeatherFetchWorker.perform(%Oban.Job{args: args})
    end
  end

  describe "RAOB perform/1" do
    setup :create_sounding_station

    test "fetches and upserts sounding with derived params", %{station: station} do
      Req.Test.stub(IemClient, fn conn ->
        Req.Test.json(conn, raob_json_body())
      end)

      args = %{
        "fetch_type" => "raob",
        "station_id" => station.id,
        "station_code" => "72451",
        "sounding_time" => "2026-03-28T12:00:00Z"
      }

      assert :ok = WeatherFetchWorker.perform(%Oban.Job{args: args})
      assert Repo.aggregate(Sounding, :count) == 1

      sounding = Repo.one(Sounding)
      assert sounding.station_id == station.id
      assert sounding.level_count == 5
      assert sounding.surface_temp_c == 15.0
    end

    test "skips when sounding already exists", %{station: station} do
      Weather.upsert_sounding(station, %{
        observed_at: ~U[2026-03-28 12:00:00Z],
        profile: [],
        level_count: 0
      })

      Req.Test.stub(IemClient, fn conn ->
        Plug.Conn.send_resp(conn, 500, "Should not be called")
      end)

      args = %{
        "fetch_type" => "raob",
        "station_id" => station.id,
        "station_code" => "72451",
        "sounding_time" => "2026-03-28T12:00:00Z"
      }

      assert :ok = WeatherFetchWorker.perform(%Oban.Job{args: args})
      assert Repo.aggregate(Sounding, :count) == 1
    end

    test "stores stub sounding on empty profiles so backfill doesn't retry", %{station: station} do
      Req.Test.stub(IemClient, fn conn ->
        Req.Test.json(conn, %{"profiles" => []})
      end)

      args = %{
        "fetch_type" => "raob",
        "station_id" => station.id,
        "station_code" => "72451",
        "sounding_time" => "2026-03-28T12:00:00Z"
      }

      assert :ok = WeatherFetchWorker.perform(%Oban.Job{args: args})
      assert Repo.aggregate(Sounding, :count) == 1

      sounding = Repo.one!(Sounding)
      assert sounding.profile == []
      assert sounding.level_count == 0
      assert sounding.station_id == station.id
    end

    test "returns error on HTTP failure", %{station: station} do
      Req.Test.stub(IemClient, fn conn ->
        Plug.Conn.send_resp(conn, 503, "Service Unavailable")
      end)

      args = %{
        "fetch_type" => "raob",
        "station_id" => station.id,
        "station_code" => "72451",
        "sounding_time" => "2026-03-28T12:00:00Z"
      }

      assert {:error, "IEM RAOB HTTP 503"} = WeatherFetchWorker.perform(%Oban.Job{args: args})
    end

    test "returns :ok when station no longer exists" do
      args = %{
        "fetch_type" => "raob",
        "station_id" => Ecto.UUID.generate(),
        "station_code" => "GONE",
        "sounding_time" => "2026-03-28T12:00:00Z"
      }

      assert :ok = WeatherFetchWorker.perform(%Oban.Job{args: args})
    end
  end
end