require "pod4/sequel_interface"

require "sequel"
require "date"
require "time"
require "bigdecimal"

require_relative "../common/shared_examples_for_interface"



describe "SequelInterface" do

  def fill_data(ifce)
    data.each{|r| ifce.create(r) }
  end

  def fill_product_data(ifce)
    ifce.create( {code: "foo", name: "bar"} )
  end

  def list_contains(ifce, id)
    ifce.list.find {|x| x[ifce.id_fld] == id }
  end

  let(:sequel_interface_class) do
    Class.new SequelInterface do
      set_table :customer
      set_id_fld :id
    end
  end

  let(:schema_interface_class) do
    Class.new SequelInterface do
      set_schema :public
      set_table  :customer
      set_id_fld :id, autoincrement: true
    end
  end

  let(:prod_interface_class) do
    Class.new SequelInterface do
      set_table  :product
      set_id_fld :code, autoincrement: false
    end
  end

  let(:bad_interface_class1) do
    Class.new SequelInterface do
      set_table :customer
    end
  end

  let(:bad_interface_class2) do
    Class.new SequelInterface do
      set_id_fld :id
    end
  end

  let(:data) do
    d = []
    d << { name:      "Barney",
           level:     1.23,
           day:       Date.parse("2016-01-01"),
           timestamp: Time.parse("2015-01-01 12:11"),
           flag:      true,
           price:     BigDecimal("1.24") }

    d << { name:      "Fred",
           level:     2.34,
           day:       Date.parse("2016-02-02"),
           timestamp: Time.parse("2015-01-02 12:22"),
           flag:      false,
           price:     BigDecimal("2.35") }

    d << { name:      "Betty",
           level:     3.45,
           day:       Date.parse("2016-03-03"),
           timestamp: Time.parse("2015-01-03 12:33"),
           flag:      nil,
           price:     BigDecimal("3.46") }

    d
  end

  # This is stolen almost verbatim from the Sequel Readme. We use an in-memory
  # sqlite database, and we assume that Sequel is sane and behaves broadly the
  # same for our limited purposes as it would when talking to TinyTDS or Pg.
  # We test these elsewhere...
  let (:db) do
    db = Sequel.sqlite

    db.create_table :customer do
      primary_key :id
      String      :name
      Float       :level
      Date        :day
      Time        :timestamp
      TrueClass   :flag
      BigDecimal  :price, :size=>[10.2] # Sequel doesn't support money
    end

    db.create_table :product do
      String :code, :primary_key => true
      String :name
    end

    db
  end

  let(:interface)      { sequel_interface_class.new(db) }
  let(:prod_interface) { prod_interface_class.new(db) }

  before(:each) do
    fill_data(interface)
  end



  it_behaves_like "an interface" do
    let(:interface) do
      db2 = Sequel.sqlite
      db2.create_table :customer do
        primary_key :id
        String      :name
        Float       :level
        Date        :day
        Time        :timestamp
        TrueClass   :flag
        BigDecimal  :price, :size=>[10.2] 
      end

      sequel_interface_class.new(db2)
    end

    let(:record) { {name: "Barney", price: 1.11} }
  end


  describe "SequelInterface.set_schema" do

    it "takes one argument" do
      expect( sequel_interface_class ).to respond_to(:set_schema).with(1).argument
    end

  end


  describe "SequelInterface.schema" do

    it "returns the schema" do
      expect( schema_interface_class.schema ).to eq :public
    end

    it "is optional" do
      expect{ sequel_interface_class.schema }.not_to raise_exception
      expect( sequel_interface_class.schema ).to eq nil
    end

  end


  describe "SequelInterface.set_table" do

    it "takes one argument" do
      expect( sequel_interface_class ).to respond_to(:set_table).with(1).argument
    end

  end


  describe "SequelInterface.table" do

    it "returns the table" do
      expect( sequel_interface_class.table ).to eq :customer
    end

  end


  describe "SequelInterface.set_id_fld" do

    it "takes one argument" do
      expect( sequel_interface_class ).to respond_to(:set_id_fld).with(1).argument
    end

    it "takes an optional second 'autoincrement' argument" do
      expect{ prod_interface_class.set_id_fld(:foo, autoincrement: false) }.not_to raise_error
    end

  end


  describe "SequelInterface.id_fld" do

    it "returns the ID field name" do
      expect( sequel_interface_class.id_fld ).to eq :id
    end

  end


  describe "#new" do
    # See also common/sequel_interface_pg_spec

    it "requires the table and id field to be defined in the class" do
      expect{ SequelInterface.new(db) }.to raise_exception Pod4Error
      expect{ bad_interface_class1.new(db)   }.to raise_exception Pod4Error
      expect{ bad_interface_class2.new(db)   }.to raise_exception Pod4Error
    end

  end # of #new


  describe "#quoted_table" do

    it "returns just the table when the schema is not set" do
      expect( interface.quoted_table ).to eq( %Q|`customer`| )
    end

    it "returns the schema plus table when the schema is set" do
      ifce = schema_interface_class.new(db)
      expect( ifce.quoted_table ).to eq( %|`public`.`customer`| )
    end

  end # of #quoted_table


  describe "#create" do
    let(:hash) { {name: "Bam-Bam", price: 4.44} }
    let(:ot)   { Octothorpe.new(name: "Wilma", price: 5.55) }

    it "raises a Pod4::DatabaseError if anything goes wrong" do
      expect{ interface.create(one: "two") }.to raise_exception DatabaseError
    end

    it "raises an ArgumentError if ID field is missing in hash and not AI" do
      hash = {name: "bar"}
      expect{ prod_interface.create(Octothorpe.new hash) }.to raise_error ArgumentError
    end

    it "creates the record when given a hash" do
      # kinda impossible to seperate these two tests
      id = interface.create(hash)

      expect( id ).not_to be_nil
      expect{ interface.read(id) }.not_to raise_exception
      expect( interface.read(id).to_h ).to include hash
    end

    it "creates the record when given an Octothorpe" do
      id = interface.create(ot)

      expect( id ).not_to be_nil
      expect{ interface.read(id) }.not_to raise_exception
      expect( interface.read(id).to_h ).to include ot.to_h
    end

    it "does not freak out if the hash has symbol values" do
      # Which, Sequel does
      expect{ interface.create(name: :Booboo) }.not_to raise_exception
    end

    it "has no problem with record values of nil" do
      record = {name: "Ranger", price: nil}
      expect{ interface.create(record) }.not_to raise_exception
      id = interface.create(record)
      expect( interface.read(id).to_h ).to include(record)
    end

    it "has no problem with strings containing special characters" do
      record = {name: "T'Challa[]", price: nil}
      expect{ interface.create(record) }.not_to raise_exception
      id = interface.create(record)
      expect( interface.read(id).to_h ).to include(record)
    end

    it "has no problem with non-integer keys" do
      hash = {code: "foo", name: "bar"}
      id = prod_interface.create( Octothorpe.new(hash) )

      expect( id ).to eq "foo"
      expect{ prod_interface.read("foo") }.not_to raise_exception
      expect( prod_interface.read("foo").to_h ).to include hash
    end

    it "copes with an OT with the ID field in it when the ID field autoincrements" do
      h = {id: nil, name: "Bam-Bam", price: 4.44}
      expect{ interface.create(h) }.not_to raise_error

      id = interface.create(h)
      expect( id ).not_to be_nil
      expect{ interface.read(id) }.not_to raise_exception
      expect( interface.read(id).to_h ).to include( {name: "Bam-Bam", price: 4.44} )
    end

  end # of #create


  describe "#read" do

    it "returns the record for the id as an Octothorpe" do
      expect( interface.read(2).to_h ).to include(name: "Fred", price: 2.35)
    end

    it "raises a Pod4::CantContinue if the ID is bad" do
      expect{ interface.read(:foo) }.to raise_exception CantContinue
    end

    it "returns an empty Octothorpe if no record matches the ID" do
      expect{ interface.read(99) }.not_to raise_exception
      expect( interface.read(99) ).to be_a_kind_of Octothorpe
      expect( interface.read(99) ).to be_empty
    end

    it "returns real fields as Float" do
      level = interface.read(1).>>.level

      expect( level ).to be_a_kind_of Float
      expect( level ).to be_within(0.001).of( data.first[:level] )
    end

    it "returns date fields as Date" do
      date = interface.read(1).>>.day

      expect( date ).to be_a_kind_of Date
      expect( date ).to eq data.first[:day]
    end

    it "returns datetime fields as Time" do
      timestamp = interface.read(1).>>.timestamp

      expect( timestamp ).to be_a_kind_of Time
      expect( timestamp ).to eq data.first[:timestamp]
    end

    it "returns numeric fields as BigDecimal" do
      price = interface.read(1).>>.price

      expect( price ).to be_a_kind_of BigDecimal
      expect( price ).to eq data.first[:price]
    end

    # Not sure how this passes since SQLite doesn"t have a boolean class, but, Sequel handles it.
    it "returns boolean fields as boolean" do
      [1,2,3].each do |i|
        flag = interface.read(i).>>.flag
        expect( [true, false, nil].include? flag ).to be true
        expect( flag ).to be data[i - 1][:flag]
      end
    end

    it "has no problem with non-integer keys" do
      # this is a 100% overlap with the create test above...
      fill_product_data(prod_interface)

      expect{ prod_interface.read("foo") }.not_to raise_exception
      expect( prod_interface.read("foo").to_h ).to include(code: "foo", name: "bar")
    end

  end # of #read


  describe "#list" do

    it "has an optional selection parameter, a hash" do
      # Actually it does not have to be a hash, but FTTB we only support that.
      expect{ interface.list(name: "Barney") }.not_to raise_exception
    end

    it "returns an array of Octothorpes that match the records" do
      arr = interface.list.map {|ot| x = ot.to_h}

      expect( arr.size ).to eq(data.size)

      data.each do |d|
        r = arr.find{|x| x[:name] == d[:name] }
        expect( r ).not_to be_nil
        expect( r[:level]     ).to be_within(0.001).of( d[:level] )
        expect( r[:day]       ).to eq d[:day]
        expect( r[:timestamp] ).to eq d[:timestamp]
        expect( r[:qty]       ).to eq d[:qty]
      end
    end

    it "returns a subset of records based on the selection parameter" do
      expect( interface.list(name: "Fred").size ).to eq 1

      expect( interface.list(name: "Betty").first.to_h ).
        to include(name: "Betty", price: 3.46)

    end

    it "returns an empty Array if nothing matches" do
      expect( interface.list(name: "Yogi") ).to eq([])
    end

    it "raises DatabaseError if the selection criteria is nonsensical" do
      expect{ interface.list("foo") }.to raise_exception Pod4::DatabaseError
    end

    it "returns an empty array if there is no data" do
      interface.list.each {|x| interface.delete(x[interface.id_fld]) }
      expect( interface.list ).to eq([])
    end

    it "does not freak out if the hash has symbol values" do
      # Which, Sequel does
      expect{ interface.list(name: :Barney) }.not_to raise_exception
    end

  end # of #list
  

  describe "#update" do
    let(:id) { interface.list.first[:id] }

    it "updates the record at ID with record parameter" do
      record = {name: "Booboo", price: 99.99}
      interface.update(id, record)

      booboo = interface.read(id)
      expect( booboo.>>.name       ).to eq( record[:name] )
      expect( booboo.>>.price.to_f ).to eq( record[:price] )
    end

    it "raises a CantContinue if anything weird happens with the ID" do
      expect{ interface.update(99, name: "Booboo") }.
        to raise_exception CantContinue

    end

    it "raises a DatabaseError if anything weird happens with the record" do
      expect{ interface.update(id, smarts: "more") }.
        to raise_exception DatabaseError

    end

    it "does not freak out if the hash has symbol values" do
      # Which, Sequel does
      expect{ interface.update(id, name: :Booboo) }.not_to raise_exception
    end

    it "has no problem with record values of nil" do
      record = {name: "Ranger", price: nil}
      expect{ interface.update(id, record) }.not_to raise_exception
      expect( interface.read(id).to_h ).to include(record)
    end

    it "has no problem with strings containing special characters" do
      record = {name: "T'Challa[]", price: nil}
      expect{ interface.update(id, record) }.not_to raise_exception
      expect( interface.read(id).to_h ).to include(record)
    end

    it "has no problem with non-integer keys" do
      fill_product_data(prod_interface)
      expect{ prod_interface.update("foo", name: "baz") }.not_to raise_error
      expect( prod_interface.read("foo").to_h[:name] ).to eq "baz"
    end

  end # of #update


  describe "#delete" do

    let(:id) { interface.list.first[:id] }

    it "raises CantContinue if anything hinky happens with the ID" do
      expect{ interface.delete(:foo) }.to raise_exception CantContinue
      expect{ interface.delete(99)   }.to raise_exception CantContinue
    end

    it "makes the record at ID go away" do
      expect( list_contains(interface, id) ).to be_truthy
      interface.delete(id)
      expect( list_contains(interface, id) ).to be_falsy
    end

    it "has no problem with non-integer keys" do
      fill_product_data(prod_interface)
      expect( list_contains(prod_interface, "foo") ).to be_truthy
      prod_interface.delete("foo")
      expect( list_contains(prod_interface, "foo") ).to be_falsy
    end

  end # of #delete


  describe "#execute" do

    let(:sql) { "delete from customer where price < 2.0;" }

    it "requires an SQL string" do
      expect{ interface.execute      }.to raise_exception ArgumentError
      expect{ interface.execute(nil) }.to raise_exception ArgumentError
      expect{ interface.execute(14)  }.to raise_exception ArgumentError
    end

    it "raises some sort of Pod4 error if it runs into problems" do
      expect{ interface.execute("delete from not_a_table") }.
        to raise_exception Pod4Error

    end

    it "executes the string" do
      expect{ interface.execute(sql) }.not_to raise_exception
      expect( interface.list.size ).to eq(data.size - 1)
      expect( interface.list.map{|r| r[:name] } ).not_to include "Barney"
    end

  end # of #execute


  describe "#select" do

    it "requires an SQL string" do
      expect{ interface.select      }.to raise_exception ArgumentError
      expect{ interface.select(nil) }.to raise_exception ArgumentError
      expect{ interface.select(14)  }.to raise_exception ArgumentError
    end

    it "raises some sort of Pod4 error if it runs into problems" do
      expect{ interface.select("select * from not_a_table") }.
        to raise_exception Pod4Error

    end

    it "returns the result of the sql" do
      sql1 = "select name from customer where price < 2.0;"
      sql2 = "select name from customer where price < 0.0;"

      expect{ interface.select(sql1) }.not_to raise_exception
      expect( interface.select(sql1) ).to eq( [{name: "Barney"}] )
      expect( interface.select(sql2) ).to eq( [] )
    end

    it "works if you pass a non-select" do
      # By which I mean: still executes the SQL; returns []
      sql = "delete from customer where price < 2.0;"
      ret = interface.select(sql)

      expect( interface.list.size ).to eq(data.size - 1)
      expect( interface.list.map{|r| r[:name] } ).not_to include "Barney"
      expect( ret ).to eq( [] )
    end

  end # of #select


  describe "#executep" do
    # For the time being lets assume that Sequel does its job and the three modes we are calling
    # actually work

    let(:sql) { "delete from customer where price < ?;" }

    it "requires an SQL string and a mode" do
      expect{ interface.executep                 }.to raise_exception ArgumentError
      expect{ interface.executep(nil)            }.to raise_exception ArgumentError
      expect{ interface.executep(14, :update)    }.to raise_exception ArgumentError
      expect{ interface.executep(14, :update, 2) }.to raise_exception ArgumentError
    end

    it "requires the mode to be valid" do
      expect{ interface.executep(sql, :foo, 2) }.to raise_exception ArgumentError
    end

    it "raises some sort of Pod4 error if it runs into problems" do
      expect{ interface.executep("delete from not_a_table where thingy = ?", :delete, 14) }.
        to raise_exception Pod4Error

    end

    it "executes the string" do
      expect{ interface.executep(sql, :delete, 2.0) }.not_to raise_exception
      expect( interface.list.size ).to eq(data.size - 1)
      expect( interface.list.map{|r| r[:name] } ).not_to include "Barney"
    end

  end # of #executep


  describe "#selectp" do

    it "requires an SQL string" do
      expect{ interface.selectp      }.to raise_exception ArgumentError
      expect{ interface.selectp(nil) }.to raise_exception ArgumentError
      expect{ interface.selectp(14)  }.to raise_exception ArgumentError
    end

    it "raises some sort of Pod4 error if it runs into problems" do
      expect{ interface.selectp("select * from not_a_table where thingy = ?", 14) }.
        to raise_exception Pod4Error

    end

    it "returns the result of the sql" do
      sql = "select name from customer where price < ?;"

      expect{ interface.selectp(sql, 2.0) }.not_to raise_exception
      expect( interface.selectp(sql, 2.0) ).to eq( [{name: "Barney"}] )
      expect( interface.selectp(sql, 0.0) ).to eq( [] )
    end

    it "works if you pass a non-select" do
      # By which I mean: still executes the SQL; returns []
      sql = "delete from customer where price < ?;"
      ret = interface.selectp(sql, 2.0)

      expect( interface.list.size ).to eq(data.size - 1)
      expect( interface.list.map{|r| r[:name] } ).not_to include "Barney"
      expect( ret ).to eq( [] )
    end

  end # of #selectp


end