defmodule Mix.Tasks.Analytics3i.Chart do
  use Mix.Task

  require Logger

  @shortdoc "Chart"

  def run(_) do
    {:ok, _} = Application.ensure_all_started(:analytics_3i)

    Logger.add_backend {LoggerFileBackend, :debug}

    Logger.configure_backend {LoggerFileBackend, :debug},
                             path: Path.expand("../../../log/debug.log", __DIR__),
                             format: "$time $metadata[$level] $message\n"

    otrasl_list = load_yaml("data/otrasl.yml")
    st_list = load_yaml("data/st.yml")

    template = load_json("data/charts.json")

    graph = %{
      "balloonText" => "[[title]] of [[otrasl]]:[[value]]",
      "color" => "#ffffff",
      "fillAlphas" => 0.9,
      "fontSize" => 10,
      "labelText" => "[[value]]",
      "id" => "AmGraph-1",
      "title" => "st 1",
      "type" => "column",
      "valueField" => "st-1"
    }

    graphPercent = Map.merge(graph, %{
      "balloonText" =>  "[[title]], [[category]]<br><span style='font-size:14px;'><b>[[value]]</b> ([[percents]]%)</span>",
      "labelText" => "[[value]] / [[percents]]%"
    })

#    result =
#      Path.wildcard("output/*.csv")
#      |> Enum.reduce(%{graphs: %{}, dataProvider: %{}}, fn (file_name, acc) ->

    result =
      Path.wildcard("output/*.csv")
      |> Enum.reduce(%{}, fn (file_name, acc) ->
        {otrasl, st} = otrasl_st(file_name)

        store =
          read_csv!(file_name)
          |> Enum.reduce(%{}, fn raw_row, acc ->
               {:ok, row} = raw_row
               {:ok, d, _} = DateTime.from_iso8601(row["created_date"])
               Map.put(acc, DateTime.to_unix(d), Map.merge(row, %{"created_date" => d}))
             end)
        store_keys = store |> Map.keys() |> Enum.sort()
        first = store_keys |> List.first()
        last = store_keys |> List.last()

        {:ok, first_date} = first |> DateTime.from_unix()
        {:ok, last_date} = last |> DateTime.from_unix()

        {quarts, first_quart} = quart_diff(last_date, first_date)

        years =
          (first_date.year..last_date.year)
          |> Enum.reduce(%{}, fn year, acc ->
               Map.put(acc, year, %{})
             end)

        quart_store =
          store_keys
          |> Enum.reduce(%{quarts: years, quart: first_quart, quart_num: 1}, fn key, acc ->
               row = Map.get(store, key)
               {:ok, date} = DateTime.from_unix(key)
               quart =
                 if Enum.empty?(acc[:quarts]) do
                   acc[:quart]
                 else
                   detect_quart(date)
                 end

               new_acc =
                 if acc[:quart] != quart do
                   %{quart_num: acc[:quart_num] + 1, quart: quart}
                 else
                   %{quart_num: acc[:quart_num], quart: acc[:quart]}
                 end

               year = Map.get(acc[:quarts], date.year)
               unless Map.has_key?(year, quart) do
                 year = Map.merge(year, %{quart => []})
               end

               acc
               |> Map.merge(new_acc)
               |> Map.merge(%{quarts: Map.put(acc[:quarts], date.year, Map.merge(year, %{quart => List.insert_at(year[quart], -1, 1)}))})
             end)

        new_acc =
          quart_store[:quarts]
          |> Enum.reduce(acc, fn {y, v}, yacc ->
             yacc = generate_year(yacc, y)
             Map.merge(yacc, %{y => generate_quarts(yacc, y, v, otrasl, st, otrasl_list, st_list)})
          end)

      end)

      result
      |> Enum.each(fn {year, l} ->
           l
           |> Enum.each(fn {quart, data} ->
             graph_maker(data, year, quart, template, graph, graphPercent, st_list)
           end)
         end)
  end

  defp generate_year(acc, y) do
    if Map.has_key?(acc, y) do
      acc
    else
      Map.merge(acc, %{y => %{}})
    end
  end

  defp generate_quarts(year_acc, y, v, otrasl, st, otrasl_list, st_list) do
    v
    |> Enum.reduce(year_acc[y], fn {q, l}, acc ->
      if Map.has_key?(acc, q) do
        Map.merge(acc, %{q => data_providers(acc[q], l, otrasl, st, otrasl_list, st_list)})
      else
        Map.merge(acc, %{q => data_providers(%{dataProvider: %{}, graphs: %{}}, l, otrasl, st, otrasl_list, st_list)})
      end
    end)
  end

  defp data_providers(acc, list, otrasl, st, otrasl_list, st_list) do
    count = list |> Enum.count()

    otrasl_data = Map.get(acc[:dataProvider], otrasl, %{name: otrasl_list[otrasl]["name"], data: %{}})
    otrasl_data = Map.put(otrasl_data, :data, Map.put(otrasl_data[:data], st, count - 1))

    acc = Map.put(acc, :graphs, Map.put(acc[:graphs], st, st_list[st]["name"]))
    Map.put(acc, :dataProvider, Map.put(acc[:dataProvider], otrasl, otrasl_data))
  end

  defp graph_maker(result, year, quart, template, graph, graphPercent, st_list) do
    graphs =
      result[:graphs]
      |> Enum.map(fn {label, name} ->
        Map.merge(graph, %{"title" => name, "valueField" => label, "id" => "AmGraph-#{label}"})
      end)

    graphsPercent =
      result[:graphs]
      |> Enum.map(fn {label, name} ->
        Map.merge(graphPercent, %{"title" => name, "valueField" => label, "id" => "AmGraph-#{label}"})
      end)

    dataProvider =
      result[:dataProvider]
      |> Enum.map(fn {label, value} ->
        Map.put(value[:data], :otrasl, value[:name])
      end)

    dataValues =
      result[:dataProvider]
      |> Enum.map(fn {_, value} ->
        value[:data]
        |> Enum.reduce(%{}, fn ({k, v}, acc) ->
          Map.put(acc, st_list[k]["name"], v)
        end)
        |> Map.put(:Label, value[:name])
      end)

    #    dataColumns =
    #      st_list
    #        |> Enum.map(fn {_, value} ->
    #             value[:name]
    #           end)
    #    dataColumns = ["Label"] ++ dataColumns

    valueAxes = List.first(template["valueAxes"]) |> Map.merge(%{"title" => "% от числа публикаций", "stackType" => "100%"})
    titles = List.first(template["titles"]) |> Map.merge(%{"text" => "СТ в СМИ по отраслям (%) #{year} Q#{quart}"})

    data =
      Map.merge(template, %{"dataProvider" => dataProvider, "graphs" => graphsPercent, "valueAxes" => [valueAxes], "titles" => [titles]})
      |> IO.inspect()

    write_json(data, "output/graph_percent.#{year}.#{quart}.json")

    valueAxes = List.first(template["valueAxes"]) |> Map.merge(%{"title" => "Число публикаций"})
    titles = List.first(template["titles"]) |> Map.merge(%{"text" => "СТ в СМИ по отраслям #{year} Q#{quart}"})

    data =
      Map.merge(template, %{"dataProvider" => dataProvider, "graphs" => graphs, "valueAxes" => [valueAxes], "titles" => [titles]})
      |> IO.inspect()

    write_json(data, "output/graph_regular.#{year}.#{quart}.json")

    write_csv!(Map.keys(List.first(dataValues)), dataValues, "#{year}.#{quart}")
  end

  defp otrasl_st(file_name) do
    info = String.split(Path.basename(file_name), ~r{[_.]})

    otrasl_name_size = Enum.count(info) - 3
    otrasl_name_size = if Enum.at(info, otrasl_name_size) == "new", do: otrasl_name_size - 1, else: otrasl_name_size
    otrasl_name = (1..otrasl_name_size) |> Enum.map(fn x -> Enum.at(info, x) end) |> Enum.join("_")

    st_name_size = Enum.count(info) - otrasl_name_size - 2
    st_name = (otrasl_name_size + 1..otrasl_name_size + st_name_size) |> Enum.map(fn x -> Enum.at(info, x) end) |> Enum.join("_")

    {otrasl_name, st_name}
  end

  defp load_yaml(path) do
    path = File.cwd! |> Path.join(path)
    {:ok, data} = YamlElixir.read_from_file path

    data
  end

  defp load_json(path) do
    path = File.cwd! |> Path.join(path)
    {:ok, content} = File.read(path)
    {:ok, data} = Poison.decode(content)

    data
  end

  defp detect_quart(dt) do
    round(Float.ceil(dt.month/3))
  end

  defp quart_diff(dt1, dt2) do
    years_diff = (dt2.year - dt1.year)
    months_diff =
      if years_diff > 0 do
        dt2.month + (12-dt1.month) + (years_diff - 1) * 12
      else
        dt2.month - dt1.month
      end
    {Integer.floor_div(months_diff, 3), detect_quart(dt1)}
  end

  defp write_csv!(keys, values, suffix \\ "") do
    File.open("output/graph_dots.#{suffix}.csv.txt", [:write, :utf8], fn(file) ->
      values
      |> CSV.encode(headers: keys, separator: ?;)
      |> Enum.each(&IO.write(file, &1))
    end)
  end

  defp read_csv!(path) do
    keys =
      path
      |> File.stream!()
      |> Enum.take(1)
      |> List.first()
      |> String.split(",")
      |> Enum.map(fn k -> String.to_atom(String.trim(k)) end)

    path
    |> File.stream!
    |> CSV.decode(headers: true, separator: ?,)
  end

  defp write_json(data, path) do
    path = File.cwd! |> Path.join(path)
    {:ok, content} = Poison.encode(data)
    :ok = File.write(path, content)
  end
#
#  defp load_txt(path) do
#    path = File.cwd! |> Path.join(path)
#    {:ok, content} = File.read(path)
#    {:ok, data} = Poison.decode(content)
#
#    content
#  end
end