# frozen_string_literal: true

require "mysql2"

module ImportScripts::PhpBB3
  class Database
    # @param database_settings [ImportScripts::PhpBB3::DatabaseSettings]
    def self.create(database_settings)
      Database.new(database_settings).create_database
    end

    # @param database_settings [ImportScripts::PhpBB3::DatabaseSettings]
    def initialize(database_settings)
      @database_settings = database_settings
      @database_client = create_database_client
    end

    # @return [ImportScripts::PhpBB3::Database_3_0 | ImportScripts::PhpBB3::Database_3_1]
    def create_database
      version = get_phpbb_version

      if version.start_with?("3.0")
        require_relative "database_3_0"
        Database_3_0.new(@database_client, @database_settings)
      elsif version.start_with?("3.1") || version.start_with?("3.2") || version.start_with?("3.3")
        require_relative "database_3_1"
        Database_3_1.new(@database_client, @database_settings)
      else
        raise UnsupportedVersionError, <<~TEXT
          Unsupported version (#{version}) of phpBB detected.
          Currently only version 3.0, 3.1, 3.2 and 3.3 are supported by this importer.
        TEXT
      end
    end

    protected

    def create_database_client
      Mysql2::Client.new(
        host: @database_settings.host,
        port: @database_settings.port,
        username: @database_settings.username,
        password: @database_settings.password,
        database: @database_settings.schema,
        reconnect: true,
      )
    end

    def get_phpbb_version
      table_prefix = @database_settings.table_prefix

      @database_client.query(<<-SQL, cache_rows: false, symbolize_keys: true).first[:config_value]
        SELECT config_value
        FROM #{table_prefix}config
        WHERE config_name = 'version'
      SQL
    end
  end

  class UnsupportedVersionError < RuntimeError
  end
end