package event

import (
	"testing"

	"github.com/samber/lo"
	. "github.com/smartystreets/goconvey/convey"
	cdssdk "gitlink.org.cn/cloudream/common/sdks/storage"
)

func Test_chooseSoManyNodes(t *testing.T) {
	testcases := []struct {
		title           string
		allNodes        []*NodeLoadInfo
		count           int
		expectedNodeIDs []cdssdk.NodeID
	}{
		{
			title: "节点数量充足",
			allNodes: []*NodeLoadInfo{
				{Node: cdssdk.Node{NodeID: cdssdk.NodeID(1)}},
				{Node: cdssdk.Node{NodeID: cdssdk.NodeID(2)}},
			},
			count:           2,
			expectedNodeIDs: []cdssdk.NodeID{1, 2},
		},
		{
			title: "节点数量超过",
			allNodes: []*NodeLoadInfo{
				{Node: cdssdk.Node{NodeID: cdssdk.NodeID(1)}},
				{Node: cdssdk.Node{NodeID: cdssdk.NodeID(2)}},
				{Node: cdssdk.Node{NodeID: cdssdk.NodeID(3)}},
			},
			count:           2,
			expectedNodeIDs: []cdssdk.NodeID{1, 2},
		},
		{
			title: "只有一个节点，节点数量不够",
			allNodes: []*NodeLoadInfo{
				{Node: cdssdk.Node{NodeID: cdssdk.NodeID(1)}},
			},
			count:           3,
			expectedNodeIDs: []cdssdk.NodeID{1, 1, 1},
		},
		{
			title: "多个同地区节点，节点数量不够",
			allNodes: []*NodeLoadInfo{
				{Node: cdssdk.Node{NodeID: cdssdk.NodeID(1)}},
				{Node: cdssdk.Node{NodeID: cdssdk.NodeID(2)}},
			},
			count:           5,
			expectedNodeIDs: []cdssdk.NodeID{1, 1, 1, 2, 2},
		},
		{
			title: "节点数量不够，且在不同地区",
			allNodes: []*NodeLoadInfo{
				{Node: cdssdk.Node{NodeID: cdssdk.NodeID(1), LocationID: cdssdk.LocationID(1)}},
				{Node: cdssdk.Node{NodeID: cdssdk.NodeID(2), LocationID: cdssdk.LocationID(2)}},
			},
			count:           5,
			expectedNodeIDs: []cdssdk.NodeID{1, 2, 1, 2, 1},
		},
	}

	for _, test := range testcases {
		Convey(test.title, t, func() {
			var t CheckPackageRedundancy
			chosenNodes := t.chooseSoManyNodes(test.count, test.allNodes)

			chosenNodeIDs := lo.Map(chosenNodes, func(item *NodeLoadInfo, idx int) cdssdk.NodeID { return item.Node.NodeID })

			So(chosenNodeIDs, ShouldResemble, test.expectedNodeIDs)
		})
	}
}