package telemetry

import (
	"testing"
	"time"
)

func TestParseReading_Valid(t *testing.T) {
	receivedAt := time.Date(2026, 7, 26, 12, 0, 5, 0, time.UTC)
	raw := []byte(`{
		"device_id": "esp32-abc123",
		"zone_id": "growbox-1",
		"sensor_type": "temperature",
		"value": 24.5,
		"timestamp": "2026-07-26T12:00:00Z"
	}`)

	got, err := ParseReading(raw, receivedAt)
	if err != nil {
		t.Fatalf("unexpected error: %v", err)
	}

	want := Reading{
		DeviceID:   "esp32-abc123",
		ZoneID:     "growbox-1",
		SensorType: "temperature",
		Value:      24.5,
		RecordedAt: time.Date(2026, 7, 26, 12, 0, 0, 0, time.UTC),
		ReceivedAt: receivedAt,
	}
	if got != want {
		t.Fatalf("got %+v, want %+v", got, want)
	}
}

func TestParseReading_Invalid(t *testing.T) {
	receivedAt := time.Now()

	cases := map[string]string{
		"malformed json": `{not json`,
		"missing device_id": `{
			"zone_id": "growbox-1", "sensor_type": "temperature",
			"value": 1, "timestamp": "2026-07-26T12:00:00Z"
		}`,
		"missing zone_id": `{
			"device_id": "esp32-1", "sensor_type": "temperature",
			"value": 1, "timestamp": "2026-07-26T12:00:00Z"
		}`,
		"missing sensor_type": `{
			"device_id": "esp32-1", "zone_id": "growbox-1",
			"value": 1, "timestamp": "2026-07-26T12:00:00Z"
		}`,
		"missing timestamp": `{
			"device_id": "esp32-1", "zone_id": "growbox-1",
			"sensor_type": "temperature", "value": 1
		}`,
		"invalid timestamp format": `{
			"device_id": "esp32-1", "zone_id": "growbox-1",
			"sensor_type": "temperature", "value": 1, "timestamp": "not-a-date"
		}`,
		"value wrong type": `{
			"device_id": "esp32-1", "zone_id": "growbox-1",
			"sensor_type": "temperature", "value": "not-a-number", "timestamp": "2026-07-26T12:00:00Z"
		}`,
	}

	for name, raw := range cases {
		t.Run(name, func(t *testing.T) {
			if _, err := ParseReading([]byte(raw), receivedAt); err == nil {
				t.Fatalf("expected error, got nil")
			}
		})
	}
}