# credo:disable-for-next-line Credo.Check.Refactor.ModuleDependencies
defmodule Mix.Tasks.Enumex.Static.Gen.Migration.New do
  @shortdoc "Generates a migration for creating new database enum"

  args = [
    %{help: "Specifies an enum module", required: true, value_name: "MODULE"},
    %{help: "Specifies an enum name", required: true, value_name: "ENUM_NAME"}
  ]

  flags = [
    %{help: "Specifies an enum adapter", long: "--adapter", short: "-a", value_name: "ADAPTER"},
    %{
      help: "Specifies a query prefix",
      long: "--query-prefix",
      short: "-q",
      value_name: "QUERY_PREFIX"
    }
  ]

  task = Enumex.Generator.Task.new("enumex.static.gen.migration.new", args, flags)

  if Mix.env() == :test do
    try do
      :meck.new(:io, [:unstick, :passthrough])
    rescue
      _exception -> :ok
    end

    :meck.expect(:io, :columns, fn -> {:ok, 80} end)
  end

  help = Enumex.Generator.Task.help(task, @shortdoc, true)
  @moduledoc Enumex.Generator.Task.moduledoc(help)

  use Mix.Task

  alias Enumex.Generator.Task
  alias Enumex.Static.Adapter
  alias Enumex.Static.Components
  alias Enumex.Value
  alias Mix.Generator
  alias Mix.Tasks.Ecto.Gen.Migration

  require Generator

  @help help
  @opts [
    aliases: Task.aliases(~w[adapter query_prefix]a),
    return_separator: true,
    strict: Task.options(adapter: :string, query_prefix: :string)
  ]
  @task_name task.name
  @version Task.version(task)

  @impl Mix.Task
  def run(args), do: Task.static_migration_run(@task_name, args, @help, @version, @opts, &run/4)

  @spec run(
          [Value.enum_module() | Value.enum_name()],
          [query_prefix: Adapter.query_prefix()],
          Adapter.t(),
          OptionParser.argv()
        ) :: :ok | any()

  defp run([_module], _opts, _adapter, []) do
    Task.missing_args(@task_name, ~w[ENUM_NAME ECTO_GEN_MIGRATION_ARGS])
  end

  defp run([_module], _opts, _adapter, _ecto_args) do
    Task.missing_args(@task_name, ~w[ENUM_NAME])
  end

  defp run([_module, _name], _opts, _adapter, []) do
    Task.missing_args(@task_name, ~w[ECTO_GEN_MIGRATION_ARGS])
  end

  defp run([module, name], opts, adapter, ecto_args) do
    if {:behaviour, [Components.List]} in module.__info__(:attributes) do
      name
      |> module.list()
      |> Enum.map_join(",\n      ", &Task.gen_value_from_template(value: &1))
      |> then(
        &changes_template(adapter: adapter, module: module, prefix: opts[:query_prefix], values: &1)
      )
      |> String.trim_trailing()
      # credo:disable-for-next-line Credo.Check.Refactor.Apply
      |> then(&apply(Migration, :run, [["--change", &1 | ecto_args]]))
    else
      Task.behaviour_not_implemented(@task_name, module, Components.List)
    end
  end

  @spec run(
          [Value.enum_module() | Value.enum_name() | String.t()],
          [query_prefix: Adapter.query_prefix()],
          Adapter.t(),
          OptionParser.argv()
        ) :: :ok | any()
  defp run([_enum_module, _enum_name | args], _enum_opts, _adapter, ecto_args) do
    Task.static_migration_invalid_args(@task_name, args, ecto_args)
  end

  @spec changes_template(
          adapter: Adapter.t(),
          module: Value.enum_module(),
          prefix: Adapter.query_prefix(),
          values: String.t()
        ) :: String.t()
  Generator.embed_template(:changes, """
      alias Enumex.Static.Migration
      alias Enumex.Value
      alias <%= inspect(@module) %>

      adapter = <%= inspect(@adapter) %>

      values = [
        <%= @values %>
      ]

      Migration.create_enum(adapter, values<%= @prefix && ", query_prefix: " <> inspect(@prefix) %>)
  """)
end