package service

import "testing"

func TestDeriveUserSegment(t *testing.T) {
	t.Parallel()

	tests := []struct {
		name            string
		baselinePerDay  int
		smokingYears    float64
		expectedSegment string
	}{
		{name: "新手用户", baselinePerDay: 6, smokingYears: 1.5, expectedSegment: "newbie"},
		{name: "中度用户_按日均", baselinePerDay: 12, smokingYears: 1, expectedSegment: "moderate"},
		{name: "中度用户_按烟龄", baselinePerDay: 8, smokingYears: 3.2, expectedSegment: "moderate"},
		{name: "重度用户_按日均", baselinePerDay: 20, smokingYears: 2, expectedSegment: "heavy"},
		{name: "重度用户_按烟龄", baselinePerDay: 9, smokingYears: 10, expectedSegment: "heavy"},
	}

	for _, tc := range tests {
		tc := tc
		t.Run(tc.name, func(t *testing.T) {
			t.Parallel()

			got := deriveUserSegment(tc.baselinePerDay, tc.smokingYears)
			if got != tc.expectedSegment {
				t.Fatalf("deriveUserSegment(%d, %.1f)=%s, want=%s", tc.baselinePerDay, tc.smokingYears, got, tc.expectedSegment)
			}
		})
	}
}