package service

import "testing"

func TestRecommendMethodNoDevices(t *testing.T) {
	got := RecommendMethod(DetectionRecommendInput{})
	if len(got) != 0 {
		t.Errorf("无可用设备应返回空，实际 %+v", got)
	}
}

func TestRecommendMethodLowCost(t *testing.T) {
	got := RecommendMethod(DetectionRecommendInput{
		HasLamp: true, HasSers: true, HasQPCR: true,
		CostPreference: "low_cost",
	})
	if len(got) == 0 || got[0].Method != "lamp" {
		t.Errorf("低成本偏好应首选 LAMP，实际 %+v", got)
	}
}

func TestRecommendMethodFastest(t *testing.T) {
	got := RecommendMethod(DetectionRecommendInput{
		HasLamp: true, HasSers: true, HasQPCR: true,
		CostPreference: "fastest",
	})
	if len(got) == 0 || got[0].Method != "sers" {
		t.Errorf("最快偏好应首选 SERS，实际 %+v", got)
	}
}

func TestRecommendMethodUrgentNoSERS(t *testing.T) {
	got := RecommendMethod(DetectionRecommendInput{
		HasLamp: true, HasQPCR: true,
		Urgency: "urgent",
	})
	if len(got) == 0 || got[0].Method != "lamp" {
		t.Errorf("紧急且无 SERS 应首选 LAMP，实际 %+v", got)
	}
}

func TestRecommendMethodNoviceAvoidsQPCR(t *testing.T) {
	got := RecommendMethod(DetectionRecommendInput{
		HasLamp: true, HasSers: true, HasQPCR: true,
		OperatorLevel: "novice",
	})
	if len(got) == 0 {
		t.Fatal("应有推荐")
	}
	if got[len(got)-1].Method == "qpcr" {
		// qPCR 难度高，新手应排在最后（除非仅此可选）
	}
	// 至少 qPCR 不应排第一
	if got[0].Method == "qpcr" {
		t.Errorf("新手不应首选 qPCR，实际 %+v", got)
	}
}

func TestRecommendMethodOnlyHyperspectral(t *testing.T) {
	got := RecommendMethod(DetectionRecommendInput{HasHyperspectral: true})
	if len(got) != 1 || got[0].Method != "hyperspectral" {
		t.Errorf("仅有高光谱时应推荐且标注待验证，实际 %+v", got)
	}
}