# frozen_string_literal: true

class MigrateGithubUserInfos < ActiveRecord::Migration[6.0]
  def up
    # If the user_associated_accounts table is currently empty,
    # maintain the primary key from github_user_infos
    # This is useful for people that are using data explorer to access the data
    maintain_ids = DB.query_single("SELECT count(*) FROM user_associated_accounts")[0] == 0

    inserted_count = DB.exec(<<~SQL)
        INSERT INTO user_associated_accounts (
          provider_name,
          provider_uid,
          user_id,
          info,
          last_used,
          created_at,
          updated_at
          #{", id" if maintain_ids}
        ) SELECT
          'github',
          github_user_id,
          user_id,
          json_build_object('nickname', screen_name),
          updated_at,
          created_at,
          updated_at
          #{", id" if maintain_ids}
        FROM github_user_infos
      SQL

    execute <<~SQL if maintain_ids && inserted_count > 0
        SELECT setval(
          pg_get_serial_sequence('user_associated_accounts', 'id'),
          (select max(id) from user_associated_accounts)
        );
      SQL
  end

  def down
    raise ActiveRecord::IrreversibleMigration
  end
end