defmodule Mix.Tasks.Plsm do
    use Mix.Task

    def run(_) do
        # ensure all dependencies are started manually.
        {:ok, _started} = Application.ensure_all_started(:postgrex)

        
        configs = Plsm.Common.Configs.load_configs()

        tableHeaders = configs
                |> Plsm.Database.Common.create
                |> Plsm.Database.connect
                |> Plsm.Database.get_tables

        for header <- tableHeaders do
            columns = Plsm.Database.get_columns(header.database, header)
            table = %Plsm.Database.Table {header: header, columns: columns}

            Plsm.IO.Export.prepare(table, configs.project.name)
            |> Plsm.IO.Export.write(header.name, configs.project.destination)
        end
    end
end

defmodule Mix.Tasks.Plsm.Config do
use Mix.Task

    @doc "Generate the basic config file for a Plsm run"
    def run(params) do       
        {opts, _, _} = OptionParser.parse(params, strict: [config_file: :string])
        file_name = Keyword.get(opts, :config_file, "config/config.exs")
        case config_exists?(file_name) do
          false ->  case Plsm.Config.Config.write file_name do
                      {:error, msg} -> IO.puts msg
                      _ -> IO.puts "Configs written to #{file_name}\n"
                    end
          true -> IO.puts "Configs have already been created, please change the current config."
        end
    end

    defp config_exists?(filename) do
      case File.read(filename) do
        {:ok, content} -> String.contains?(content, ":plsm")
        _ -> false
      end
    end

    
end

defmodule Mix.Tasks.Plasm.Config do
    use Mix.Task
    def run(params) do
        Mix.Tasks.Plsm.Config.run params
    end
end

defmodule Mix.Tasks.Plasm do
    use Mix.Task

    def run(_) do
        Mix.Tasks.Plsm.run nil
    end
end