defmodule Logsrv do
  @moduledoc """
  Documentation for `Logsrv`.
  """

  def dir do
    Application.get_env(:logsrv, :dir) <> "/"
  end

  def dir(subdir) do
    "#{dir()}/#{subdir}/"
  end

  def journals do
    dir(:journals)
    |> File.ls!
  end

  def pages do
    dir(:pages)
    |> File.ls!
  end

  def compare(fd) do
    sync_conflict_fd = fd
    orig_fd = fd
      |> String.replace(~r/\.sync.*/,"\.md")

    sync_conflict = sync_conflict_fd |> File.read!
    orig = orig_fd |> File.read!

    # FOR NOW, just return the diff
    diff = orig
      |> String.myers_difference(sync_conflict)

    diff
    |> Kernel.inspect()
    |> Jason.encode!

  end

  def conflicts do
    {conflicts(journals()), conflicts(pages())}
  end

  def conflicts(list) do
    list
    |> Enum.filter( fn (fd) ->
    fd |> String.match?(~r/.*sync.*/)
    end)
  end

  def resolve_conflicts do
    {journal_conflicts, pages_conflicts} = conflicts()

    [
      journal_conflicts
    |> Enum.map( fn(fd) ->
      %{
        :type => :journal,
        :date => fd |> Logsrv.Helpers.to_date,
        :file => fd,
        :diff => compare(dir(:journals) <> fd),
      }
    end),

    pages_conflicts
    |> Enum.map( fn(fd) ->
      %{
        :type => :page,
        :file => fd,
        :diff => compare(dir(:pages) <> fd),
      }    end)
        ]
    |> List.flatten()

  end

end