package redhat

import (
	"reflect"
	"testing"
)

func TestFileAnalyser_Output(t *testing.T) {
	type args struct {
		topLines int
	}

	tests := []struct {
		name         string
		fileAnalyser *FileAnalyser
		args         args
		want         []string
	}{
		{
			name: "should reverse and only return top 10 items, as well as transform to output style",
			fileAnalyser: &FileAnalyser{
				file: nil,
				dataRows: []dataRow{
					{
						word:  "and",
						count: 9,
					},
					{
						word:  "hello",
						count: 9,
					},
					{
						word:  "Go",
						count: 7,
					},
					{
						word:  "me",
						count: 7,
					},
					{
						word:  "the",
						count: 6,
					},
					{
						word:  "of",
						count: 6,
					},
					{
						word:  "shape",
						count: 5,
					},
					{
						word:  "libraries",
						count: 4,
					},
					{
						word:  "future",
						count: 3,
					},
					{
						word:  "Some",
						count: 2,
					},
					{
						word:  "Help",
						count: 1,
					},
				},
			},
			args: args{
				topLines: 10,
			},
			want: []string{
				"2 Some",
				"3 future",
				"4 libraries",
				"5 shape",
				"6 of",
				"6 the",
				"7 me",
				"7 Go",
				"9 hello",
				"9 and",
			},
		},
		{
			name: "should reverse and return all items when total items count is less than 10",
			fileAnalyser: &FileAnalyser{
				file: nil,
				dataRows: []dataRow{
					{
						word:  "the",
						count: 205,
					},
					{
						word:  "of",
						count: 16,
					},
					{
						word:  "shape",
						count: 5,
					},
					{
						word:  "libraries",
						count: 4,
					},
					{
						word:  "future",
						count: 3,
					},
					{
						word:  "Some",
						count: 2,
					},
					{
						word:  "Help",
						count: 1,
					},
				},
			},
			args: args{
				topLines: 10,
			},
			want: []string{
				"  1 Help",
				"  2 Some",
				"  3 future",
				"  4 libraries",
				"  5 shape",
				" 16 of",
				"205 the",
			},
		},
	}
	for _, tt := range tests {
		t.Run(tt.name, func(t *testing.T) {
			if got := tt.fileAnalyser.Output(tt.args.topLines); !reflect.DeepEqual(got, tt.want) {
				t.Errorf("FileAnalyser.Output() = %v, want %v", got, tt.want)
			}
		})
	}
}