package router

import (
	"testing"
)

/*
Split into multiple package, need to be tested separately

	func TestSelectLeastLoad(t *testing.T) {
		settings := &StrategyLeastLoadConfig{
			HealthCheck: &HealthPingConfig{
				SamplingCount: 10,
			},
			Expected: 1,
			MaxRTT:   int64(time.Millisecond * time.Duration(800)),
		}
		strategy := NewLeastLoadStrategy(settings)
		// std 40
		strategy.PutResult("a", time.Millisecond*time.Duration(60))
		strategy.PutResult("a", time.Millisecond*time.Duration(140))
		strategy.PutResult("a", time.Millisecond*time.Duration(60))
		strategy.PutResult("a", time.Millisecond*time.Duration(140))
		// std 60
		strategy.PutResult("b", time.Millisecond*time.Duration(40))
		strategy.PutResult("b", time.Millisecond*time.Duration(160))
		strategy.PutResult("b", time.Millisecond*time.Duration(40))
		strategy.PutResult("b", time.Millisecond*time.Duration(160))
		// std 0, but >MaxRTT
		strategy.PutResult("c", time.Millisecond*time.Duration(1000))
		strategy.PutResult("c", time.Millisecond*time.Duration(1000))
		strategy.PutResult("c", time.Millisecond*time.Duration(1000))
		strategy.PutResult("c", time.Millisecond*time.Duration(1000))
		expected := "a"
		actual := strategy.SelectAndPick([]string{"a", "b", "c", "untested"})
		if actual != expected {
			t.Errorf("expected: %v, actual: %v", expected, actual)
		}
	}

	func TestSelectLeastLoadWithCost(t *testing.T) {
		settings := &StrategyLeastLoadConfig{
			HealthCheck: &HealthPingConfig{
				SamplingCount: 10,
			},
			Costs: []*StrategyWeight{
				{Match: "a", Value: 9},
			},
			Expected: 1,
		}
		strategy := NewLeastLoadStrategy(settings, nil)
		// std 40, std+c 120
		strategy.PutResult("a", time.Millisecond*time.Duration(60))
		strategy.PutResult("a", time.Millisecond*time.Duration(140))
		strategy.PutResult("a", time.Millisecond*time.Duration(60))
		strategy.PutResult("a", time.Millisecond*time.Duration(140))
		// std 60
		strategy.PutResult("b", time.Millisecond*time.Duration(40))
		strategy.PutResult("b", time.Millisecond*time.Duration(160))
		strategy.PutResult("b", time.Millisecond*time.Duration(40))
		strategy.PutResult("b", time.Millisecond*time.Duration(160))
		expected := "b"
		actual := strategy.SelectAndPick([]string{"a", "b", "untested"})
		if actual != expected {
			t.Errorf("expected: %v, actual: %v", expected, actual)
		}
	}
*/
func TestSelectLeastExpected(t *testing.T) {
	strategy := &LeastLoadStrategy{
		settings: &StrategyLeastLoadConfig{
			Baselines: nil,
			Expected:  3,
		},
	}
	nodes := []*node{
		{Tag: "a", RTTDeviationCost: 100},
		{Tag: "b", RTTDeviationCost: 200},
		{Tag: "c", RTTDeviationCost: 300},
		{Tag: "d", RTTDeviationCost: 350},
	}
	expected := 3
	ns := strategy.selectLeastLoad(nodes)
	if len(ns) != expected {
		t.Errorf("expected: %v, actual: %v", expected, len(ns))
	}
}

func TestSelectLeastExpected2(t *testing.T) {
	strategy := &LeastLoadStrategy{
		settings: &StrategyLeastLoadConfig{
			Baselines: nil,
			Expected:  3,
		},
	}
	nodes := []*node{
		{Tag: "a", RTTDeviationCost: 100},
		{Tag: "b", RTTDeviationCost: 200},
	}
	expected := 2
	ns := strategy.selectLeastLoad(nodes)
	if len(ns) != expected {
		t.Errorf("expected: %v, actual: %v", expected, len(ns))
	}
}

func TestSelectLeastExpectedAndBaselines(t *testing.T) {
	strategy := &LeastLoadStrategy{
		settings: &StrategyLeastLoadConfig{
			Baselines: []int64{200, 300, 400},
			Expected:  3,
		},
	}
	nodes := []*node{
		{Tag: "a", RTTDeviationCost: 100},
		{Tag: "b", RTTDeviationCost: 200},
		{Tag: "c", RTTDeviationCost: 250},
		{Tag: "d", RTTDeviationCost: 300},
		{Tag: "e", RTTDeviationCost: 310},
	}
	expected := 3
	ns := strategy.selectLeastLoad(nodes)
	if len(ns) != expected {
		t.Errorf("expected: %v, actual: %v", expected, len(ns))
	}
}

func TestSelectLeastExpectedAndBaselines2(t *testing.T) {
	strategy := &LeastLoadStrategy{
		settings: &StrategyLeastLoadConfig{
			Baselines: []int64{200, 300, 400},
			Expected:  3,
		},
	}
	nodes := []*node{
		{Tag: "a", RTTDeviationCost: 500},
		{Tag: "b", RTTDeviationCost: 600},
		{Tag: "c", RTTDeviationCost: 700},
		{Tag: "d", RTTDeviationCost: 800},
		{Tag: "e", RTTDeviationCost: 900},
	}
	expected := 3
	ns := strategy.selectLeastLoad(nodes)
	if len(ns) != expected {
		t.Errorf("expected: %v, actual: %v", expected, len(ns))
	}
}

func TestSelectLeastLoadBaselines(t *testing.T) {
	strategy := &LeastLoadStrategy{
		settings: &StrategyLeastLoadConfig{
			Baselines: []int64{200, 400, 600},
			Expected:  0,
		},
	}
	nodes := []*node{
		{Tag: "a", RTTDeviationCost: 100},
		{Tag: "b", RTTDeviationCost: 200},
		{Tag: "c", RTTDeviationCost: 300},
	}
	expected := 1
	ns := strategy.selectLeastLoad(nodes)
	if len(ns) != expected {
		t.Errorf("expected: %v, actual: %v", expected, len(ns))
	}
}

func TestSelectLeastLoadBaselinesNoQualified(t *testing.T) {
	strategy := &LeastLoadStrategy{
		settings: &StrategyLeastLoadConfig{
			Baselines: []int64{200, 400, 600},
			Expected:  0,
		},
	}
	nodes := []*node{
		{Tag: "a", RTTDeviationCost: 800},
		{Tag: "b", RTTDeviationCost: 1000},
	}
	expected := 0
	ns := strategy.selectLeastLoad(nodes)
	if len(ns) != expected {
		t.Errorf("expected: %v, actual: %v", expected, len(ns))
	}
}