package hugolib

import (
	"errors"
	"path/filepath"
	"reflect"
	"testing"

	"github.com/spf13/cast"
)

type pageGroupTestObject struct {
	path   string
	weight int
	date   string
	param  string
}

var pageGroupTestSources = []pageGroupTestObject{
	{"/section1/testpage1.md", 3, "2012-04-06", "foo"},
	{"/section1/testpage2.md", 3, "2012-01-01", "bar"},
	{"/section1/testpage3.md", 2, "2012-04-06", "foo"},
	{"/section2/testpage4.md", 1, "2012-03-02", "bar"},
	{"/section2/testpage5.md", 1, "2012-04-06", "baz"},
}

func preparePageGroupTestPages(t *testing.T) Pages {
	var pages Pages
	for _, s := range pageGroupTestSources {
		p, err := NewPage(filepath.FromSlash(s.path))
		if err != nil {
			t.Fatalf("failed to prepare test page %s", s.path)
		}
		p.Weight = s.weight
		p.Date = cast.ToTime(s.date)
		p.PublishDate = cast.ToTime(s.date)
		p.Params["custom_param"] = s.param
		p.Params["custom_date"] = cast.ToTime(s.date)
		pages = append(pages, p)
	}
	return pages
}

func TestGroupByWithFieldNameArg(t *testing.T) {
	pages := preparePageGroupTestPages(t)
	expect := PagesGroup{
		{Key: 1, Pages: Pages{pages[3], pages[4]}},
		{Key: 2, Pages: Pages{pages[2]}},
		{Key: 3, Pages: Pages{pages[0], pages[1]}},
	}

	groups, err := pages.GroupBy("Weight")
	if err != nil {
		t.Fatalf("Unable to make PagesGroup array: %s", err)
	}
	if !reflect.DeepEqual(groups, expect) {
		t.Errorf("PagesGroup has unexpected groups. It should be %#v, got %#v", expect, groups)
	}
}

func TestGroupByWithMethodNameArg(t *testing.T) {
	pages := preparePageGroupTestPages(t)
	expect := PagesGroup{
		{Key: "section1", Pages: Pages{pages[0], pages[1], pages[2]}},
		{Key: "section2", Pages: Pages{pages[3], pages[4]}},
	}

	groups, err := pages.GroupBy("Type")
	if err != nil {
		t.Fatalf("Unable to make PagesGroup array: %s", err)
	}
	if !reflect.DeepEqual(groups, expect) {
		t.Errorf("PagesGroup has unexpected groups. It should be %#v, got %#v", expect, groups)
	}
}

func TestGroupByWithSectionArg(t *testing.T) {
	pages := preparePageGroupTestPages(t)
	expect := PagesGroup{
		{Key: "section1", Pages: Pages{pages[0], pages[1], pages[2]}},
		{Key: "section2", Pages: Pages{pages[3], pages[4]}},
	}

	groups, err := pages.GroupBy("Section")
	if err != nil {
		t.Fatalf("Unable to make PagesGroup array: %s", err)
	}
	if !reflect.DeepEqual(groups, expect) {
		t.Errorf("PagesGroup has unexpected groups. It should be %#v, got %#v", expect, groups)
	}
}

func TestGroupByInReverseOrder(t *testing.T) {
	pages := preparePageGroupTestPages(t)
	expect := PagesGroup{
		{Key: 3, Pages: Pages{pages[0], pages[1]}},
		{Key: 2, Pages: Pages{pages[2]}},
		{Key: 1, Pages: Pages{pages[3], pages[4]}},
	}

	groups, err := pages.GroupBy("Weight", "desc")
	if err != nil {
		t.Fatalf("Unable to make PagesGroup array: %s", err)
	}
	if !reflect.DeepEqual(groups, expect) {
		t.Errorf("PagesGroup has unexpected groups. It should be %#v, got %#v", expect, groups)
	}
}

func TestGroupByCalledWithEmptyPages(t *testing.T) {
	var pages Pages
	groups, err := pages.GroupBy("Weight")
	if err != nil {
		t.Fatalf("Unable to make PagesGroup array: %s", err)
	}
	if groups != nil {
		t.Errorf("PagesGroup isn't empty. It should be %#v, got %#v", nil, groups)
	}
}

func TestGroupByCalledWithUnavailableKey(t *testing.T) {
	pages := preparePageGroupTestPages(t)
	_, err := pages.GroupBy("UnavailableKey")
	if err == nil {
		t.Errorf("GroupByParam should return an error but didn't")
	}
}

func (page *Page) dummyPageMethodWithArgForTest(s string) string {
	return s
}

func (page *Page) dummyPageMethodReturnThreeValueForTest() (string, string, string) {
	return "foo", "bar", "baz"
}

func (page *Page) dummyPageMethodReturnErrorOnlyForTest() error {
	return errors.New("something error occured")
}

func (page *Page) dummyPageMethodReturnTwoValueForTest() (string, string) {
	return "foo", "bar"
}

func TestGroupByCalledWithInvalidMethod(t *testing.T) {
	var err error
	pages := preparePageGroupTestPages(t)

	_, err = pages.GroupBy("dummyPageMethodWithArgForTest")
	if err == nil {
		t.Errorf("GroupByParam should return an error but didn't")
	}

	_, err = pages.GroupBy("dummyPageMethodReturnThreeValueForTest")
	if err == nil {
		t.Errorf("GroupByParam should return an error but didn't")
	}

	_, err = pages.GroupBy("dummyPageMethodReturnErrorOnlyForTest")
	if err == nil {
		t.Errorf("GroupByParam should return an error but didn't")
	}

	_, err = pages.GroupBy("dummyPageMethodReturnTwoValueForTest")
	if err == nil {
		t.Errorf("GroupByParam should return an error but didn't")
	}
}

func TestReverse(t *testing.T) {
	pages := preparePageGroupTestPages(t)

	groups1, err := pages.GroupBy("Weight", "desc")
	if err != nil {
		t.Fatalf("Unable to make PagesGroup array: %s", err)
	}

	groups2, err := pages.GroupBy("Weight")
	if err != nil {
		t.Fatalf("Unable to make PagesGroup array: %s", err)
	}
	groups2 = groups2.Reverse()

	if !reflect.DeepEqual(groups2, groups1) {
		t.Errorf("PagesGroup is sorted in unexpected order. It should be %#v, got %#v", groups2, groups1)
	}
}

func TestGroupByParam(t *testing.T) {
	pages := preparePageGroupTestPages(t)
	expect := PagesGroup{
		{Key: "bar", Pages: Pages{pages[1], pages[3]}},
		{Key: "baz", Pages: Pages{pages[4]}},
		{Key: "foo", Pages: Pages{pages[0], pages[2]}},
	}

	groups, err := pages.GroupByParam("custom_param")
	if err != nil {
		t.Fatalf("Unable to make PagesGroup array: %s", err)
	}
	if !reflect.DeepEqual(groups, expect) {
		t.Errorf("PagesGroup has unexpected groups. It should be %#v, got %#v", expect, groups)
	}
}

func TestGroupByParamInReverseOrder(t *testing.T) {
	pages := preparePageGroupTestPages(t)
	expect := PagesGroup{
		{Key: "foo", Pages: Pages{pages[0], pages[2]}},
		{Key: "baz", Pages: Pages{pages[4]}},
		{Key: "bar", Pages: Pages{pages[1], pages[3]}},
	}

	groups, err := pages.GroupByParam("custom_param", "desc")
	if err != nil {
		t.Fatalf("Unable to make PagesGroup array: %s", err)
	}
	if !reflect.DeepEqual(groups, expect) {
		t.Errorf("PagesGroup has unexpected groups. It should be %#v, got %#v", expect, groups)
	}
}

func TestGroupByParamCalledWithCapitalLetterString(t *testing.T) {
	testStr := "TestString"
	f := "/section1/test_capital.md"
	p, err := NewPage(filepath.FromSlash(f))
	if err != nil {
		t.Fatalf("failed to prepare test page %s", f)
	}
	p.Params["custom_param"] = testStr
	pages := Pages{p}

	groups, err := pages.GroupByParam("custom_param")
	if err != nil {
		t.Fatalf("Unable to make PagesGroup array: %s", err)
	}
	if groups[0].Key != testStr {
		t.Errorf("PagesGroup key is converted to a lower character string. It should be %#v, got %#v", testStr, groups[0].Key)
	}
}

func TestGroupByParamCalledWithSomeUnavailableParams(t *testing.T) {
	pages := preparePageGroupTestPages(t)
	delete(pages[1].Params, "custom_param")
	delete(pages[3].Params, "custom_param")
	delete(pages[4].Params, "custom_param")

	expect := PagesGroup{
		{Key: "foo", Pages: Pages{pages[0], pages[2]}},
	}

	groups, err := pages.GroupByParam("custom_param")
	if err != nil {
		t.Fatalf("Unable to make PagesGroup array: %s", err)
	}
	if !reflect.DeepEqual(groups, expect) {
		t.Errorf("PagesGroup has unexpected groups. It should be %#v, got %#v", expect, groups)
	}
}

func TestGroupByParamCalledWithEmptyPages(t *testing.T) {
	var pages Pages
	groups, err := pages.GroupByParam("custom_param")
	if err != nil {
		t.Fatalf("Unable to make PagesGroup array: %s", err)
	}
	if groups != nil {
		t.Errorf("PagesGroup isn't empty. It should be %#v, got %#v", nil, groups)
	}
}

func TestGroupByParamCalledWithUnavailableParam(t *testing.T) {
	pages := preparePageGroupTestPages(t)
	_, err := pages.GroupByParam("unavailable_param")
	if err == nil {
		t.Errorf("GroupByParam should return an error but didn't")
	}
}

func TestGroupByDate(t *testing.T) {
	pages := preparePageGroupTestPages(t)
	expect := PagesGroup{
		{Key: "2012-04", Pages: Pages{pages[4], pages[2], pages[0]}},
		{Key: "2012-03", Pages: Pages{pages[3]}},
		{Key: "2012-01", Pages: Pages{pages[1]}},
	}

	groups, err := pages.GroupByDate("2006-01")
	if err != nil {
		t.Fatalf("Unable to make PagesGroup array: %s", err)
	}
	if !reflect.DeepEqual(groups, expect) {
		t.Errorf("PagesGroup has unexpected groups. It should be %#v, got %#v", expect, groups)
	}
}

func TestGroupByDateInReverseOrder(t *testing.T) {
	pages := preparePageGroupTestPages(t)
	expect := PagesGroup{
		{Key: "2012-01", Pages: Pages{pages[1]}},
		{Key: "2012-03", Pages: Pages{pages[3]}},
		{Key: "2012-04", Pages: Pages{pages[0], pages[2], pages[4]}},
	}

	groups, err := pages.GroupByDate("2006-01", "asc")
	if err != nil {
		t.Fatalf("Unable to make PagesGroup array: %s", err)
	}
	if !reflect.DeepEqual(groups, expect) {
		t.Errorf("PagesGroup has unexpected groups. It should be %#v, got %#v", expect, groups)
	}
}

func TestGroupByPublishDate(t *testing.T) {
	pages := preparePageGroupTestPages(t)
	expect := PagesGroup{
		{Key: "2012-04", Pages: Pages{pages[4], pages[2], pages[0]}},
		{Key: "2012-03", Pages: Pages{pages[3]}},
		{Key: "2012-01", Pages: Pages{pages[1]}},
	}

	groups, err := pages.GroupByPublishDate("2006-01")
	if err != nil {
		t.Fatalf("Unable to make PagesGroup array: %s", err)
	}
	if !reflect.DeepEqual(groups, expect) {
		t.Errorf("PagesGroup has unexpected groups. It should be %#v, got %#v", expect, groups)
	}
}

func TestGroupByPublishDateInReverseOrder(t *testing.T) {
	pages := preparePageGroupTestPages(t)
	expect := PagesGroup{
		{Key: "2012-01", Pages: Pages{pages[1]}},
		{Key: "2012-03", Pages: Pages{pages[3]}},
		{Key: "2012-04", Pages: Pages{pages[0], pages[2], pages[4]}},
	}

	groups, err := pages.GroupByDate("2006-01", "asc")
	if err != nil {
		t.Fatalf("Unable to make PagesGroup array: %s", err)
	}
	if !reflect.DeepEqual(groups, expect) {
		t.Errorf("PagesGroup has unexpected groups. It should be %#v, got %#v", expect, groups)
	}
}

func TestGroupByPublishDateWithEmptyPages(t *testing.T) {
	var pages Pages
	groups, err := pages.GroupByPublishDate("2006-01")
	if err != nil {
		t.Fatalf("Unable to make PagesGroup array: %s", err)
	}
	if groups != nil {
		t.Errorf("PagesGroup isn't empty. It should be %#v, got %#v", nil, groups)
	}
}

func TestGroupByParamDate(t *testing.T) {
	pages := preparePageGroupTestPages(t)
	expect := PagesGroup{
		{Key: "2012-04", Pages: Pages{pages[4], pages[2], pages[0]}},
		{Key: "2012-03", Pages: Pages{pages[3]}},
		{Key: "2012-01", Pages: Pages{pages[1]}},
	}

	groups, err := pages.GroupByParamDate("custom_date", "2006-01")
	if err != nil {
		t.Fatalf("Unable to make PagesGroup array: %s", err)
	}
	if !reflect.DeepEqual(groups, expect) {
		t.Errorf("PagesGroup has unexpected groups. It should be %#v, got %#v", expect, groups)
	}
}

func TestGroupByParamDateInReverseOrder(t *testing.T) {
	pages := preparePageGroupTestPages(t)
	expect := PagesGroup{
		{Key: "2012-01", Pages: Pages{pages[1]}},
		{Key: "2012-03", Pages: Pages{pages[3]}},
		{Key: "2012-04", Pages: Pages{pages[0], pages[2], pages[4]}},
	}

	groups, err := pages.GroupByParamDate("custom_date", "2006-01", "asc")
	if err != nil {
		t.Fatalf("Unable to make PagesGroup array: %s", err)
	}
	if !reflect.DeepEqual(groups, expect) {
		t.Errorf("PagesGroup has unexpected groups. It should be %#v, got %#v", expect, groups)
	}
}

func TestGroupByParamDateWithEmptyPages(t *testing.T) {
	var pages Pages
	groups, err := pages.GroupByParamDate("custom_date", "2006-01")
	if err != nil {
		t.Fatalf("Unable to make PagesGroup array: %s", err)
	}
	if groups != nil {
		t.Errorf("PagesGroup isn't empty. It should be %#v, got %#v", nil, groups)
	}
}