# frozen_string_literal: true

require "active_support/core_ext/enumerable"

require "date"
module FakeRecord
  class Column < Struct.new(:name, :type)
  end

  class Connection
    attr_reader :tables
    attr_accessor :visitor

    def initialize(visitor = nil)
      @tables = %w{ users photos developers products}
      @columns = {
        "users" => [
          Column.new("id", :integer),
          Column.new("name", :string),
          Column.new("bool", :boolean),
          Column.new("created_at", :date)
        ],
        "products" => [
          Column.new("id", :integer),
          Column.new("price", :decimal)
        ]
      }
      @columns_hash = {
        "users" => @columns["users"].index_by(&:name),
        "products" => @columns["products"].index_by(&:name)
      }
      @primary_keys = {
        "users" => "id",
        "products" => "id"
      }
      @visitor = visitor
    end

    def columns_hash(table_name)
      @columns_hash[table_name]
    end

    def primary_key(name)
      @primary_keys[name.to_s]
    end

    def data_source_exists?(name)
      @tables.include? name.to_s
    end

    def columns(name, message = nil)
      @columns[name.to_s]
    end

    def quote_table_name(name)
      "\"#{name}\""
    end

    def quote_column_name(name)
      "\"#{name}\""
    end

    def sanitize_as_sql_comment(comment)
      comment
    end

    def schema_cache
      self
    end

    def quote(thing)
      case thing
      when DateTime
        "'#{thing.strftime("%Y-%m-%d %H:%M:%S")}'"
      when Date
        "'#{thing.strftime("%Y-%m-%d")}'"
      when true
        "'t'"
      when false
        "'f'"
      when nil
        "NULL"
      when Numeric
        thing
      else
        "'#{thing.to_s.gsub("'", "\\\\'")}'"
      end
    end
  end

  class ConnectionPool
    class Spec < Struct.new(:config)
    end

    attr_reader :spec, :connection

    def initialize
      @spec = Spec.new(adapter: "america")
      @connection = Connection.new
      @connection.visitor = Arel::Visitors::ToSql.new(connection)
    end

    def with_connection
      yield connection
    end

    def table_exists?(name)
      connection.tables.include? name.to_s
    end

    def columns_hash
      connection.columns_hash
    end

    def schema_cache
      connection
    end

    def quote(thing)
      connection.quote thing
    end
  end

  class Base
    attr_accessor :connection_pool

    def initialize
      @connection_pool = ConnectionPool.new
    end

    def connection
      connection_pool.connection
    end
  end
end
