package main

import (
	"os"
	"path/filepath"
	"testing"
)

func TestReadSensors(t *testing.T) {
	root := t.TempDir()
	write := func(path, content string) {
		t.Helper()
		p := filepath.Join(root, path)
		os.MkdirAll(filepath.Dir(p), 0o755)
		if err := os.WriteFile(p, []byte(content+"\n"), 0o644); err != nil {
			t.Fatal(err)
		}
	}
	write("thermal/thermal_zone0/type", "acpitz")
	write("thermal/thermal_zone0/temp", "47000")
	write("thermal/thermal_zone1/type", "x86_pkg_temp")
	write("thermal/thermal_zone1/temp", "61000")
	write("thermal/thermal_zone2/type", "broken")
	write("thermal/thermal_zone2/temp", "0")
	write("hwmon/hwmon3/name", "coretemp")
	write("hwmon/hwmon3/temp1_input", "62000")
	write("hwmon/hwmon3/temp1_label", "Package id 0")
	write("hwmon/hwmon3/temp2_input", "58500")
	write("hwmon/hwmon3/temp2_label", "Core 0")
	write("hwmon/hwmon4/name", "nvme")
	write("hwmon/hwmon4/temp1_input", "39000")
	write("hwmon/hwmon5/name", "nvme")
	write("hwmon/hwmon5/temp1_input", "41000")

	got := readSensors(filepath.Join(root, "thermal"), filepath.Join(root, "hwmon"))
	want := map[string]float64{
		"acpitz": 47, "x86_pkg_temp": 61, "coretemp Package id 0": 62, "coretemp Core 0": 58.5,
		"nvme temp1": 39, "nvme temp1 2": 41,
	}
	if len(got) != len(want) {
		t.Fatalf("sensors = %+v", got)
	}
	for _, s := range got {
		if v, ok := want[s.Label]; !ok || v != s.Temp || s.Key != s.Label {
			t.Errorf("unexpected %+v", s)
		}
	}
	if h := hottest(got); h != 62 {
		t.Errorf("hottest = %v", h)
	}
	if got := readSensors(filepath.Join(root, "none"), filepath.Join(root, "none")); len(got) != 0 || hottest(got) == hottest(got) {
		t.Errorf("no sensors: %+v (hottest should be NaN)", got)
	}
}