defmodule Microwaveprop.Radio.CsvImportTest do
  use Microwaveprop.DataCase, async: true

  alias Microwaveprop.Radio.Contact
  alias Microwaveprop.Radio.CsvImport
  alias Microwaveprop.Terrain.ElevationClient
  alias Microwaveprop.Weather.HrrrClient
  alias Microwaveprop.Weather.IemClient

  setup do
    Req.Test.stub(IemClient, fn conn ->
      case conn.request_path do
        "/cgi-bin/request/asos.py" -> Req.Test.text(conn, "#DEBUG,\nstation,valid,tmpf\n")
        _ -> Req.Test.json(conn, %{"profiles" => []})
      end
    end)

    Req.Test.stub(HrrrClient, fn conn ->
      Plug.Conn.send_resp(conn, 404, "not found")
    end)

    Req.Test.stub(ElevationClient, fn conn ->
      params = Plug.Conn.fetch_query_params(conn).query_params
      lat_count = params["latitude"] |> String.split(",") |> length()
      Req.Test.json(conn, %{"elevation" => List.duplicate(200.0, lat_count)})
    end)

    :ok
  end

  @valid_header "station1,station2,grid1,grid2,band,mode,qso_timestamp"
  @valid_row "W5XD,K5TR,EM12,EM00,10000,CW,2026-03-28T18:00:00Z"
  @submitter "test@example.com"

  describe "import/2 with empty or missing data" do
    test "returns error for empty string" do
      assert {:error, :empty_csv} = CsvImport.import("", @submitter)
    end

    test "returns error for whitespace-only string" do
      assert {:error, :empty_csv} = CsvImport.import("   \n  \n  ", @submitter)
    end

    test "returns error for header-only CSV" do
      assert {:error, :no_data_rows} = CsvImport.import(@valid_header, @submitter)
    end

    test "returns error for header plus blank lines only" do
      csv = @valid_header <> "\n\n\n"
      assert {:error, :no_data_rows} = CsvImport.import(csv, @submitter)
    end
  end

  describe "import/2 with valid data" do
    test "imports a single valid row" do
      csv = @valid_header <> "\n" <> @valid_row

      assert {:ok, %{imported: [contact], errors: []}} = CsvImport.import(csv, @submitter)
      assert %Contact{} = contact
      assert contact.station1 == "W5XD"
      assert contact.station2 == "K5TR"
      assert contact.grid1 == "EM12"
      assert contact.grid2 == "EM00"
      assert contact.mode == "CW"
      assert contact.user_submitted == true
      assert contact.submitter_email == @submitter
      assert contact.pos1
      assert contact.pos2
      assert contact.distance_km
    end

    test "imports multiple valid rows" do
      csv =
        Enum.join(
          [
            @valid_header,
            "W5XD,K5TR,EM12,EM00,10000,CW,2026-03-28T18:00:00Z",
            "N5AC,W5LUA,EM13,EM20,24000,SSB,2026-03-28T19:00:00Z"
          ],
          "\n"
        )

      assert {:ok, %{imported: imported, errors: []}} = CsvImport.import(csv, @submitter)
      assert length(imported) == 2
    end

    test "trims whitespace from fields" do
      csv = @valid_header <> "\n" <> " W5XD , K5TR , EM12 , EM00 , 10000 , CW , 2026-03-28T18:00:00Z "

      assert {:ok, %{imported: [contact], errors: []}} = CsvImport.import(csv, @submitter)
      assert contact.station1 == "W5XD"
      assert contact.station2 == "K5TR"
    end

    test "handles Windows line endings" do
      csv = @valid_header <> "\r\n" <> @valid_row <> "\r\n"

      assert {:ok, %{imported: [contact], errors: []}} = CsvImport.import(csv, @submitter)
      assert contact.station1 == "W5XD"
    end

    test "skips blank lines between data rows" do
      csv =
        Enum.join(
          [
            @valid_header,
            @valid_row,
            "",
            "",
            "N5AC,W5LUA,EM13,EM20,24000,SSB,2026-03-28T19:00:00Z"
          ],
          "\n"
        )

      assert {:ok, %{imported: imported, errors: []}} = CsvImport.import(csv, @submitter)
      assert length(imported) == 2
    end

    test "contacts are persisted to the database" do
      csv = @valid_header <> "\n" <> @valid_row

      assert {:ok, _result} = CsvImport.import(csv, @submitter)
      assert Repo.aggregate(Contact, :count) == 1
    end
  end

  describe "import/2 with invalid data" do
    test "reports wrong column count with row number" do
      csv = @valid_header <> "\n" <> "W5XD,K5TR,EM12"

      assert {:ok, %{imported: [], errors: [{2, errors}]}} = CsvImport.import(csv, @submitter)
      assert Enum.any?(errors, &String.contains?(&1, "column"))
    end

    test "reports invalid band" do
      csv = @valid_header <> "\n" <> "W5XD,K5TR,EM12,EM00,99999,CW,2026-03-28T18:00:00Z"

      assert {:ok, %{imported: [], errors: [{2, errors}]}} = CsvImport.import(csv, @submitter)
      assert length(errors) > 0
    end

    test "reports invalid grid square" do
      csv = @valid_header <> "\n" <> "W5XD,K5TR,ZZZZ,EM00,10000,CW,2026-03-28T18:00:00Z"

      assert {:ok, %{imported: [], errors: [{2, errors}]}} = CsvImport.import(csv, @submitter)
      assert length(errors) > 0
    end

    test "reports invalid mode" do
      csv = @valid_header <> "\n" <> "W5XD,K5TR,EM12,EM00,10000,RTTY,2026-03-28T18:00:00Z"

      assert {:ok, %{imported: [], errors: [{2, errors}]}} = CsvImport.import(csv, @submitter)
      assert length(errors) > 0
    end

    test "reports missing required fields" do
      csv = @valid_header <> "\n" <> ",K5TR,EM12,EM00,10000,CW,2026-03-28T18:00:00Z"

      assert {:ok, %{imported: [], errors: [{2, errors}]}} = CsvImport.import(csv, @submitter)
      assert length(errors) > 0
    end

    test "reports invalid timestamp" do
      csv = @valid_header <> "\n" <> "W5XD,K5TR,EM12,EM00,10000,CW,not-a-date"

      assert {:ok, %{imported: [], errors: [{2, errors}]}} = CsvImport.import(csv, @submitter)
      assert length(errors) > 0
    end
  end

  describe "import/2 with mixed valid and invalid rows" do
    test "imports valid rows and reports invalid rows" do
      csv =
        Enum.join(
          [
            @valid_header,
            @valid_row,
            "W5XD,K5TR,EM12,EM00,99999,CW,2026-03-28T18:00:00Z",
            "N5AC,W5LUA,EM13,EM20,24000,SSB,2026-03-28T19:00:00Z"
          ],
          "\n"
        )

      assert {:ok, %{imported: imported, errors: errors}} = CsvImport.import(csv, @submitter)
      assert length(imported) == 2
      assert [{3, _error_msgs}] = errors
    end

    test "row numbers account for header and blank lines" do
      csv =
        Enum.join(
          [
            @valid_header,
            @valid_row,
            "",
            "bad row with wrong columns",
            "N5AC,W5LUA,EM13,EM20,24000,SSB,2026-03-28T19:00:00Z"
          ],
          "\n"
        )

      assert {:ok, %{imported: imported, errors: errors}} = CsvImport.import(csv, @submitter)
      assert length(imported) == 2
      # Row 4 is the bad row (header=1, data=2, blank=3, bad=4, good=5)
      assert [{4, _error_msgs}] = errors
    end
  end
end