# Copyright 2024 Adobe. All rights reserved.
# This file is licensed to you under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License. You may obtain a copy
# of the License at http://www.apache.org/licenses/LICENSE-2.0

# Unless required by applicable law or agreed to in writing, software distributed under
# the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR REPRESENTATIONS
# OF ANY KIND, either express or implied. See the License for the specific language
# governing permissions and limitations under the License.

defmodule Dumper do
  @moduledoc false
  use Phoenix.Component

  import Ecto.Query

  alias Phoenix.LiveDashboard.PageBuilder

  embed_templates "dumper/components/*"

  def docs(assigns) do
    doctext =
      case Code.fetch_docs(assigns.module) do
        {_, _, _, _, %{"en" => doctext} = _module_doc, _, _} -> String.trim(doctext)
        _ -> ""
      end

    markdown_html =
      doctext
      |> Earmark.as_html!(code_class_prefix: "lang- language-")
      |> Phoenix.HTML.raw()

    assigns = assign(assigns, markdown: markdown_html, doctext: doctext)

    ~H"""
    <details :if={@doctext != ""} class="markdown mt-2">
      <summary class="cursor-pointer">Documentation</summary>
      <div class="card bg-light mt-1 p-3 small">{@markdown}</div>
    </details>
    """
  end

  def module_name(module), do: module |> to_string() |> String.replace(~r/^Elixir\./, "")

  def humanize_association_name(module) when is_atom(module) do
    module |> Atom.to_string() |> String.split("_") |> Enum.map_join(" ", &String.capitalize/1)
  end

  def fields(module, config_module) do
    all = module.__schema__(:fields)
    excluded = config_module.excluded_fields()

    {allowed_map, allowed_strict?} =
      case config_module.allowed_fields() do
        nil -> {%{}, false}
        %{} = m -> {m, true}
        {m, :lenient} -> {m, false}
        {m, _strict} -> {m, true}
      end

    cond do
      allowed_strict? || Map.has_key?(allowed_map, module) ->
        allowed_map |> Map.get(module, []) |> Enum.filter(fn f -> f in all end)

      Map.has_key?(excluded, module) ->
        Enum.reduce(excluded[module], all, fn f, acc -> List.delete(acc, f) end)

      true ->
        all
    end
  end

  def embeds(module), do: module.__schema__(:embeds)
  def redacted_fields(module), do: module.__schema__(:redact_fields)
  def custom_record_links(record, config_module), do: config_module.custom_record_links(record)
  def additional_associations(record, config_module), do: config_module.additional_associations(record)

  def value(assigns) do
    assigns.config_module.display(assigns)
  end

  def paginate(query, %{"pagenum" => page, "page_size" => page_size}, repo) do
    page = if is_binary(page), do: String.to_integer(page), else: page
    page = max(1, page)

    page_size = if is_binary(page_size), do: String.to_integer(page_size), else: page_size
    page_size = max(1, page_size)
    page_size_plus_one = page_size + 1

    entries =
      query
      |> limit(^page_size_plus_one)
      |> offset(^(page_size * (page - 1)))
      |> repo.all()

    %{
      entries: Enum.take(entries, page_size),
      has_prev?: page > 1,
      has_next?: Enum.count(entries) == page_size_plus_one,
      page: page,
      page_size: page_size
    }
  end

  defp fetch_rows(otp_app) do
    fn params, _node ->
      %{search: search, sort_by: _sort_by, sort_dir: sort_dir, limit: limit} = params
      search = String.downcase(search || "")

      {:ok, modules} = :application.get_key(otp_app, :modules)

      modules =
        modules
        |> Enum.filter(&is_ecto_schema?/1)
        |> Enum.map(fn module -> %{name: module |> Module.split() |> Enum.join(".")} end)

      # apply search
      modules = Enum.filter(modules, fn %{name: name} -> String.downcase(name) =~ search end)

      # sort
      modules = Enum.sort(modules, sort_dir)

      {Enum.take(modules, limit), Enum.count(modules)}
    end
  end

  defp row_attrs(%{name: module}) do
    [
      {"phx-click", "show_table"},
      {"phx-value-module", module},
      {"phx-page-loading", true}
    ]
  end

  defp is_ecto_schema?(module) do
    # true iff it 1. is a module 2. has a __schema__ function 3. is not an Embedded Schema
    match?({:module, _}, Code.ensure_loaded(module)) &&
      {:__schema__, 1} in module.__info__(:functions) &&
      module.__schema__(:source) != nil
  end
end