describe 'Ridgepole::Client.diff' do
  before do
    allow(Ridgepole::Diff).to receive(:postgresql?).and_return(true)
  end

  context 'when change column' do
    let(:actual_dsl) {
      <<-EOS
        create_table "clubs", force: :cascade do |t|
          t.string "name", limit: 255, default: "", null: false
        end

        add_index "clubs", ["name"], name: "idx_name", unique: true, using: :btree

        create_table "departments", primary_key: "dept_no", force: :cascade do |t|
          t.string "dept_name", limit: 40, null: false
        end

        add_index "departments", ["dept_name"], name: "idx_dept_name", unique: true, using: :btree

        create_table "dept_emp", id: false, force: :cascade do |t|
          t.integer "emp_no", null: false
          t.string  "dept_no", limit: 4, null: false
          t.date    "from_date", null: false
          t.date    "to_date", null: false
        end

        add_index "dept_emp", ["dept_no"], name: "idx_dept_emp_dept_no", using: :btree
        add_index "dept_emp", ["emp_no"], name: "idx_dept_emp_emp_no", using: :btree

        create_table "dept_manager", id: false, force: :cascade do |t|
          t.string  "dept_no", limit: 4, null: false
          t.integer "emp_no", null: false
          t.date    "from_date", null: false
          t.date    "to_date", null: false
        end

        add_index "dept_manager", ["dept_no"], name: "idx_dept_manager_dept_no", using: :btree
        add_index "dept_manager", ["emp_no"], name: "idx_dept_manager_emp_no", using: :btree

        create_table "employee_clubs", force: :cascade do |t|
          t.integer "emp_no", null: false
          t.integer "club_id", null: false
        end

        add_index "employee_clubs", ["emp_no", "club_id"], name: "idx_employee_clubs_emp_no_club_id", using: :btree

        create_table "employees", primary_key: "emp_no", force: :cascade do |t|
          t.date   "birth_date", null: false
          t.string "first_name", limit: 14, null: false
          t.string "last_name", limit: 16, null: false
          t.date   "hire_date", null: false
        end

        create_table "salaries", id: false, force: :cascade do |t|
          t.integer "emp_no", null: false
          t.integer "salary", null: false
          t.date    "from_date", null: false
          t.date    "to_date", null: false
        end

        add_index "salaries", ["emp_no"], name: "idx_salaries_emp_no", using: :btree

        create_table "titles", id: false, force: :cascade do |t|
          t.integer "emp_no", null: false
          t.string  "title", limit: 50, null: false
          t.date    "from_date", null: false
          t.date    "to_date"
        end

        add_index "titles", ["emp_no"], name: "idx_titles_emp_no", using: :btree
      EOS
    }

    let(:expected_dsl) {
      <<-EOS
        create_table "clubs", force: :cascade do |t|
          t.string "name", limit: 255, default: "", null: false
        end

        add_index "clubs", ["name"], name: "idx_name", unique: true, using: :btree

        create_table "departments", primary_key: "dept_no", force: :cascade do |t|
          t.string "dept_name", limit: 40, null: false
        end

        add_index "departments", ["dept_name"], name: "idx_dept_name", unique: true, using: :btree

        create_table "dept_emp", id: false, force: :cascade do |t|
          t.integer "emp_no", null: false
          t.string  "dept_no", limit: 4, null: false
          t.date    "from_date", null: false
          t.date    "to_date", null: false
        end

        add_index "dept_emp", ["dept_no"], name: "idx_dept_emp_dept_no", using: :btree
        add_index "dept_emp", ["emp_no"], name: "idx_dept_emp_emp_no", using: :btree

        create_table "dept_manager", id: false, force: :cascade do |t|
          t.string  "dept_no", limit: 4, null: false
          t.integer "emp_no", null: false
          t.date    "from_date", null: false
          t.date    "to_date", null: false
        end

        add_index "dept_manager", ["dept_no"], name: "idx_dept_manager_dept_no", using: :btree
        add_index "dept_manager", ["emp_no"], name: "idx_dept_manager_emp_no", using: :btree

        create_table "employee_clubs", force: :cascade do |t|
          t.integer "emp_no", null: false
          t.integer "club_id", null: true
        end

        add_index "employee_clubs", ["emp_no", "club_id"], name: "idx_employee_clubs_emp_no_club_id", using: :btree

        create_table "employees", primary_key: "emp_no", force: :cascade do |t|
          t.date   "birth_date", null: false
          t.string "first_name", limit: 14, null: false
          t.string "last_name", limit: 20, default: "XXX", null: false
          t.date   "hire_date", null: false
        end

        create_table "salaries", id: false, force: :cascade do |t|
          t.integer "emp_no", null: false
          t.integer "salary", null: false
          t.date    "from_date", null: false
          t.date    "to_date", null: false
        end

        add_index "salaries", ["emp_no"], name: "idx_salaries_emp_no", using: :btree

        create_table "titles", id: false, force: :cascade do |t|
          t.integer "emp_no", null: false
          t.string  "title", limit: 50, null: false
          t.date    "from_date", null: false
          t.date    "to_date"
        end

        add_index "titles", ["emp_no"], name: "idx_titles_emp_no", using: :btree
      EOS
    }

    subject { Ridgepole::Client }

    it {
      delta = subject.diff(actual_dsl, expected_dsl)
      expect(delta.differ?).to be_truthy
      expect(delta.script).to match_fuzzy <<-EOS
        change_column("employee_clubs", "club_id", :integer, {:null=>true, :default=>nil})

        change_column("employees", "last_name", :string, {:limit=>20, :default=>"XXX"})
      EOS
    }
  end

  describe 'column position warning' do
    subject { Ridgepole::Client }

    context 'when adding a column to the last' do
      let(:actual_dsl) { <<-EOS }
      create_table "users", force: :cascade do |t|
        t.string "name", null: false
      end
      EOS

      let(:expected_dsl) { <<-EOS }
      create_table "users", force: :cascade do |t|
        t.string "name", null: false
        t.datetime "created_at", null: false
        t.datetime "updated_at", null: false
      end
      EOS

      # XXX:
      before { client }

      it "doesn't warn anything" do
        expect(Ridgepole::Logger.instance).to_not receive(:warn)
        delta = subject.diff(actual_dsl, expected_dsl)
        expect(delta).to be_differ
        expect(delta.script).to_not include('after')
      end
    end

    context 'when adding a column to the middle' do
      let(:actual_dsl) { <<-EOS }
      create_table "users", force: :cascade do |t|
        t.datetime "created_at", null: false
      end
      EOS

      let(:expected_dsl) { <<-EOS }
      create_table "users", force: :cascade do |t|
        t.string "name", null: false
        t.integer "age", null: false
        t.datetime "created_at", null: false
        t.datetime "updated_at", null: false
      end
      EOS

      # XXX:
      before { client }

      it 'warns position' do
        expect(Ridgepole::Logger.instance).to receive(:warn).with(/PostgreSQL doesn't support adding a new column .* users\.name/)
        expect(Ridgepole::Logger.instance).to receive(:warn).with(/PostgreSQL doesn't support adding a new column .* users\.age/)
        expect(Ridgepole::Logger.instance).to_not receive(:warn)
        delta = subject.diff(actual_dsl, expected_dsl)
        expect(delta).to be_differ
        expect(delta.script).to_not include('after')
      end
    end
  end
end