package sensor

import "testing"

func TestParsePower(t *testing.T) {
	for _, tt := range []struct {
		name    string
		payload string
		power   float64
		wantErr bool
	}{
		{"tasmota", `{"Time":"2026-10-12T12:00:00","ENERGY":{"Total":12.5,"Voltage":230,"Power":139.60}}`, 139.6, false},
		{"zero", `{"ENERGY":{"Power":0}}`, 0, false},
		{"threshold", `{"ENERGY":{"Power":3.00}}`, 3, false},
		{"missing energy", `{}`, 0, true},
		{"missing power", `{"ENERGY":{"Voltage":230}}`, 0, true},
		{"null energy", `{"ENERGY":null}`, 0, true},
		{"null power", `{"ENERGY":{"Power":null}}`, 0, true},
		{"string power", `{"ENERGY":{"Power":"139.60"}}`, 0, true},
		{"overflow", `{"ENERGY":{"Power":1e1000}}`, 0, true},
		{"invalid json", `{"ENERGY":`, 0, true},
		{"trailing json", `{"ENERGY":{"Power":1}} {}`, 0, true},
	} {
		t.Run(tt.name, func(t *testing.T) {
			got, err := ParsePower([]byte(tt.payload))
			if (err != nil) != tt.wantErr {
				t.Fatalf("ParsePower() error = %v; want error %v", err, tt.wantErr)
			}
			if !tt.wantErr && got != tt.power {
				t.Errorf("ParsePower() = %v; want %v", got, tt.power)
			}
		})
	}
}