defmodule PhilomenaWeb.AppView do
  use Phoenix.HTML

  import PhilomenaWeb.Gettext

  @time_strings %{
    seconds: "less than a minute",
    minute: "about a minute",
    minutes: "%d minutes",
    hour: "about an hour",
    hours: "about %d hours",
    day: "a day",
    days: "%d days",
    month: "about a month",
    months: "%d months",
    year: "about a year",
    years: "%d years"
  }

  @months %{
    1 => "January",
    2 => "February",
    3 => "March",
    4 => "April",
    5 => "May",
    6 => "June",
    7 => "July",
    8 => "August",
    9 => "September",
    10 => "October",
    11 => "November",
    12 => "December"
  }

  def pretty_time(time) do
    now = DateTime.utc_now()
    seconds = DateTime.diff(now, time, :second)
    relation = if seconds < 0, do: "from now", else: "ago"

    words = distance_of_time_in_words(now, time)

    content_tag(:time, "#{words} #{relation}",
      datetime: DateTime.to_iso8601(time),
      title: datetime_string(time)
    )
  end

  def tag_list(image) do
    Philomena.Images.tag_list(image)
  end

  def distance_of_time_in_words(time_2, time_1) do
    seconds = abs(DateTime.diff(time_2, time_1, :second))
    minutes = div(seconds, 60)
    hours = div(minutes, 60)
    days = div(hours, 24)
    months = div(days, 30)
    years = div(days, 365)

    cond do
      seconds < 45 -> String.replace(@time_strings[:seconds], "%d", to_string(seconds))
      seconds < 90 -> String.replace(@time_strings[:minute], "%d", to_string(1))
      minutes < 45 -> String.replace(@time_strings[:minutes], "%d", to_string(minutes))
      minutes < 90 -> String.replace(@time_strings[:hour], "%d", to_string(1))
      hours < 24 -> String.replace(@time_strings[:hours], "%d", to_string(hours))
      hours < 42 -> String.replace(@time_strings[:day], "%d", to_string(1))
      days < 30 -> String.replace(@time_strings[:days], "%d", to_string(days))
      days < 45 -> String.replace(@time_strings[:month], "%d", to_string(1))
      days < 365 -> String.replace(@time_strings[:months], "%d", to_string(months))
      days < 548 -> String.replace(@time_strings[:year], "%d", to_string(1))
      true -> String.replace(@time_strings[:years], "%d", to_string(years))
    end
  end

  def can?(conn, action, model) do
    Canada.Can.can?(conn.assigns.current_user, action, model)
  end

  def map_join(enumerable, joiner, map_fn) do
    enumerable
    |> Enum.map(map_fn)
    |> Enum.intersperse(joiner)
  end

  def number_with_delimiter(nil), do: "0"

  def number_with_delimiter(number) do
    number
    |> to_charlist()
    |> Enum.reverse()
    |> Enum.chunk_every(3)
    |> Enum.map(&Enum.reverse(&1))
    |> Enum.reverse()
    |> Enum.join(",")
  end

  def pluralize(singular, plural, count) do
    if count == 1 do
      singular
    else
      plural
    end
  end

  def button_to(text, route, args \\ []) do
    method = Keyword.get(args, :method, "get")
    class = Keyword.get(args, :class, nil)
    data = Keyword.get(args, :data, [])

    form_for(nil, route, [method: method, class: "button_to"], fn _f ->
      submit(text, class: class, data: data)
    end)
  end

  def escape_nl2br(nil), do: nil

  # Everything is escaped before being sent to raw/1
  # sobelow_skip ["XSS.Raw"]
  def escape_nl2br(text) do
    text
    |> String.split("\n")
    |> Enum.map(&html_escape/1)
    |> Enum.map(&safe_to_string/1)
    |> Enum.join("<br/>")
    |> raw()
  end

  defp datetime_string(time) do
    :io_lib.format("~2..0B:~2..0B:~2..0B, ~s ~B, ~B", [
      time.hour,
      time.minute,
      time.second,
      @months[time.month],
      time.day,
      time.year
    ])
    |> to_string()
  end

  def link_to_ip(_conn, nil), do: content_tag(:code, "null")

  def link_to_ip(_conn, ip) do
    link(to: "/ip_profiles/#{ip}") do
      [
        content_tag(:i, "", class: "fas fa-network-wired"),
        " ",
        to_string(ip)
      ]
    end
  end

  def link_to_fingerprint(_conn, nil), do: content_tag(:code, "null")

  def link_to_fingerprint(_conn, fp) do
    link(to: "/fingerprint_profiles/#{fp}") do
      [
        content_tag(:i, "", class: "fas fa-desktop"),
        " ",
        String.slice(fp, 0..6)
      ]
    end
  end

  def communication_body_class(%{destroyed_content: true}), do: "communication--destroyed"
  def communication_body_class(_communication), do: nil

  def can_view_communication?(conn, communication) do
    user_id =
      case conn.assigns.current_user do
        nil -> -1
        user -> user.id
      end

    cond do
      can?(conn, :hide, communication) and not hide_staff_tools?(conn) -> true
      communication.destroyed_content -> false
      not communication.approved and communication.user_id != user_id -> false
      true -> true
    end
  end

  def hide_staff_tools?(conn),
    do: conn.cookies["hide_staff_tools"] == "true"

  def blank?(nil), do: true
  def blank?(""), do: true
  def blank?([]), do: true
  def blank?(map) when is_map(map), do: map == %{}
  def blank?(str) when is_binary(str), do: String.trim(str) == ""
  def blank?(_object), do: false

  def present?(object), do: not blank?(object)

  # This and related functions are taken from
  # https://github.com/adam12/phoenix_mtm
  # Copied due to the package no longer being actively updated
  # and screwing up our dependencies.
  # Credit goes to the respective authors.
  def collection_checkboxes(form, field, collection, opts \\ []) do
    name = input_name(form, field) <> "[]"
    selected = Keyword.get(opts, :selected, [])
    input_opts = Keyword.get(opts, :input_opts, [])
    label_opts = Keyword.get(opts, :label_opts, [])
    mapper = Keyword.get(opts, :mapper, &mapper_unwrapped/6)
    wrapper = Keyword.get(opts, :wrapper, & &1)

    inputs =
      Enum.map(collection, fn {label_content, value} ->
        id = input_id(form, field) <> "_#{value}"

        input_opts =
          input_opts
          |> Keyword.put(:type, "checkbox")
          |> Keyword.put(:id, id)
          |> Keyword.put(:name, name)
          |> Keyword.put(:value, "#{value}")
          |> put_selected(selected, value)

        label_opts = label_opts ++ [for: id]

        mapper.(form, field, input_opts, label_content, label_opts, opts)
        |> wrapper.()
      end)

    html_escape(
      inputs ++
        hidden_input(form, field, name: name, value: "")
    )
  end

  defp put_selected(opts, selected, value) do
    if Enum.member?(selected, value) do
      Keyword.put(opts, :checked, true)
    else
      opts
    end
  end

  defp mapper_unwrapped(form, field, input_opts, label_content, label_opts, _opts) do
    [
      tag(:input, input_opts),
      label(form, field, "#{label_content}", label_opts)
    ]
  end

  def image_has_sources(image), do: Enum.count(image.sources) > 0

  def image_first_source(image) do
    if image_has_sources(image), do: Enum.at(image.sources, 0).source, else: ""
  end

  def get_flash(%{assigns: %{flash: nil}}), do: %{}
  def get_flash(%{assigns: %{flash: flash}}), do: flash
  def get_flash(_), do: %{}

  def get_flash(%{assigns: %{flash: nil}}, _key), do: %{}
  def get_flash(%{assigns: %{flash: flash}}, key), do: Phoenix.Flash.get(flash, key)
  def get_flash(_, _key), do: %{}

  def site_name, do: gettext("Philomena Site")

  def shorten_number(n) when n >= 1_000_000_000, do: "#{Float.floor(n / 1_000_000_000, 1)}B"
  def shorten_number(n) when n >= 1_000_000, do: "#{Float.floor(n / 1_000_000, 1)}M"
  def shorten_number(n) when n >= 1_000, do: "#{Float.floor(n / 1_000, 1)}K"
  def shorten_number(n), do: n
end