// Copyright 2019 The Hugo Authors. All rights reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

package page

import (
	"testing"

	"github.com/stretchr/testify/require"
)

func TestProbablyEq(t *testing.T) {

	p1, p2, p3 := &testPage{title: "p1"}, &testPage{title: "p2"}, &testPage{title: "p3"}
	pages12 := Pages{p1, p2}
	pages21 := Pages{p2, p1}
	pages123 := Pages{p1, p2, p3}

	t.Run("Pages", func(t *testing.T) {
		assert := require.New(t)

		assert.True(pages12.ProbablyEq(pages12))
		assert.False(pages123.ProbablyEq(pages12))
		assert.False(pages12.ProbablyEq(pages21))
	})

	t.Run("PageGroup", func(t *testing.T) {
		assert := require.New(t)

		assert.True(PageGroup{Key: "a", Pages: pages12}.ProbablyEq(PageGroup{Key: "a", Pages: pages12}))
		assert.False(PageGroup{Key: "a", Pages: pages12}.ProbablyEq(PageGroup{Key: "b", Pages: pages12}))

	})

	t.Run("PagesGroup", func(t *testing.T) {
		assert := require.New(t)

		pg1, pg2 := PageGroup{Key: "a", Pages: pages12}, PageGroup{Key: "b", Pages: pages123}

		assert.True(PagesGroup{pg1, pg2}.ProbablyEq(PagesGroup{pg1, pg2}))
		assert.False(PagesGroup{pg1, pg2}.ProbablyEq(PagesGroup{pg2, pg1}))

	})

}

func TestToPages(t *testing.T) {
	assert := require.New(t)

	p1, p2 := &testPage{title: "p1"}, &testPage{title: "p2"}
	pages12 := Pages{p1, p2}

	mustToPages := func(in interface{}) Pages {
		p, err := ToPages(in)
		assert.NoError(err)
		return p
	}

	assert.Equal(Pages{}, mustToPages(nil))
	assert.Equal(pages12, mustToPages(pages12))
	assert.Equal(pages12, mustToPages([]Page{p1, p2}))
	assert.Equal(pages12, mustToPages([]interface{}{p1, p2}))

	_, err := ToPages("not a page")
	assert.Error(err)
}