package main

import (
	"reflect"
	"testing"

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

func Test_calcSyncRanges(t *testing.T) {
	type args struct {
		from    int64
		to      int64
		shardBy int64
	}
	tests := []struct {
		name string
		args args
		want []*syncRange
	}{
		{
			name: "one range",
			args: args{
				from:    0,
				to:      10,
				shardBy: 10,
			},
			want: []*syncRange{
				{
					from: 0,
					to:   10,
				},
			},
		},
		{
			name: "two ranges",
			args: args{
				from:    0,
				to:      20,
				shardBy: 10,
			},
			want: []*syncRange{
				{
					from: 0,
					to:   10,
				},
				{
					from: 11,
					to:   20,
				},
			},
		},
		{
			name: "three ranges",
			args: args{
				from:    0,
				to:      20,
				shardBy: 6,
			},
			want: []*syncRange{
				{
					from: 0,
					to:   6,
				},
				{
					from: 7,
					to:   12,
				},
				{
					from: 13,
					to:   18,
				},
				{
					from: 19,
					to:   20,
				},
			},
		},
		{
			name: "four ranges actual data",
			args: args{
				from:    1583798400000000000,
				to:      1583884800000000000,
				shardBy: 21600000000000,
			},
			want: []*syncRange{
				{
					from: 1583798400000000000,
					to:   1583820000000000000,
				},
				{
					from: 1583820000000000001,
					to:   1583841600000000000,
				},
				{
					from: 1583841600000000001,
					to:   1583863200000000000,
				},
				{
					from: 1583863200000000001,
					to:   1583884800000000000,
				},
			},
		},
	}
	for _, tt := range tests {
		t.Run(tt.name, func(t *testing.T) {
			if got := calcSyncRanges(tt.args.from, tt.args.to, tt.args.shardBy); !reflect.DeepEqual(got, tt.want) {
				assert.Equal(t, tt.want, got)
			}
		})
	}
}