package androidsmsgateway_test

import (
	"crypto/hmac"
	"crypto/sha256"
	"encoding/hex"
	"encoding/json"
	"testing"
	"time"

	"github.com/therootcompany/golib/http/androidsmsgateway"
)

// mustTime parses an RFC3339Nano timestamp and panics on error.
func mustTime(s string) time.Time {
	t, err := time.Parse(time.RFC3339Nano, s)
	if err != nil {
		panic(err)
	}
	return t
}

// buildRaw marshals a Webhook JSON body from individual fields.
func buildRaw(t *testing.T, deviceID, event, id, webhookID string, payload any) []byte {
	t.Helper()
	rawPayload, err := json.Marshal(payload)
	if err != nil {
		t.Fatalf("marshal payload: %v", err)
	}
	w := struct {
		DeviceID  string          `json:"deviceId"`
		Event     string          `json:"event"`
		ID        string          `json:"id"`
		Payload   json.RawMessage `json:"payload"`
		WebhookID string          `json:"webhookId"`
	}{
		DeviceID:  deviceID,
		Event:     event,
		ID:        id,
		Payload:   rawPayload,
		WebhookID: webhookID,
	}
	b, err := json.Marshal(w)
	if err != nil {
		t.Fatalf("marshal webhook: %v", err)
	}
	return b
}

// decodeRaw unmarshals raw JSON into a Webhook then calls Decode.
func decodeRaw(t *testing.T, raw []byte) androidsmsgateway.WebhookEvent {
	t.Helper()
	var wh androidsmsgateway.Webhook
	if err := json.Unmarshal(raw, &wh); err != nil {
		t.Fatalf("unmarshal Webhook: %v", err)
	}
	ev, err := androidsmsgateway.Decode(&wh)
	if err != nil {
		t.Fatalf("Decode: %v", err)
	}
	return ev
}

func TestDecode_SMSReceived(t *testing.T) {
	raw := buildRaw(t,
		"ffffffffceb0b1db0000018e937c815b", "sms:received",
		"Ey6ECgOkVVFjz3CL48B8C", "LreFUt-Z3sSq0JufY9uWB",
		map[string]any{
			"messageId":   "abc123",
			"message":     "Android is always a sweet treat!",
			"phoneNumber": "6505551212",
			"simNumber":   1,
			"receivedAt":  "2024-06-22T15:46:11.000+07:00",
		},
	)
	ev := decodeRaw(t, raw)
	got, ok := ev.(*androidsmsgateway.WebhookReceived)
	if !ok {
		t.Fatalf("expected *WebhookReceived, got %T", ev)
	}
	if got.Event != "sms:received" {
		t.Errorf("Event = %q, want sms:received", got.Event)
	}
	if got.Payload.MessageID != "abc123" {
		t.Errorf("MessageID = %q, want abc123", got.Payload.MessageID)
	}
	if got.Payload.Message != "Android is always a sweet treat!" {
		t.Errorf("Message = %q", got.Payload.Message)
	}
	if got.Payload.PhoneNumber != "6505551212" {
		t.Errorf("PhoneNumber = %q, want 6505551212", got.Payload.PhoneNumber)
	}
	if got.Payload.SimNumber != 1 {
		t.Errorf("SimNumber = %d, want 1", got.Payload.SimNumber)
	}
	want := mustTime("2024-06-22T15:46:11.000+07:00")
	if !got.Payload.ReceivedAt.Equal(want) {
		t.Errorf("ReceivedAt = %v, want %v", got.Payload.ReceivedAt, want)
	}
}

func TestDecode_SMSSent(t *testing.T) {
	raw := buildRaw(t,
		"ffffffffceb0b1db0000018e937c815b", "sms:sent",
		"Ey6ECgOkVVFjz3CL48B8C", "LreFUt-Z3sSq0JufY9uWB",
		map[string]any{
			"messageId":   "msg-456",
			"phoneNumber": "+9998887777",
			"simNumber":   1,
			"partsCount":  1,
			"sentAt":      "2026-02-18T02:05:00.000+07:00",
		},
	)
	ev := decodeRaw(t, raw)
	got, ok := ev.(*androidsmsgateway.WebhookSent)
	if !ok {
		t.Fatalf("expected *WebhookSent, got %T", ev)
	}
	if got.Event != "sms:sent" {
		t.Errorf("Event = %q, want sms:sent", got.Event)
	}
	if got.Payload.MessageID != "msg-456" {
		t.Errorf("MessageID = %q, want msg-456", got.Payload.MessageID)
	}
	if got.Payload.PhoneNumber != "+9998887777" {
		t.Errorf("PhoneNumber = %q, want +9998887777", got.Payload.PhoneNumber)
	}
	if got.Payload.PartsCount != 1 {
		t.Errorf("PartsCount = %d, want 1", got.Payload.PartsCount)
	}
	want := mustTime("2026-02-18T02:05:00.000+07:00")
	if !got.Payload.SentAt.Equal(want) {
		t.Errorf("SentAt = %v, want %v", got.Payload.SentAt, want)
	}
}

func TestDecode_SMSDelivered(t *testing.T) {
	raw := buildRaw(t,
		"ffffffffceb0b1db0000018e937c815b", "sms:delivered",
		"Ey6ECgOkVVFjz3CL48B8C", "LreFUt-Z3sSq0JufY9uWB",
		map[string]any{
			"messageId":   "msg-789",
			"phoneNumber": "+9998887777",
			"deliveredAt": "2026-02-18T02:10:00.000+07:00",
		},
	)
	ev := decodeRaw(t, raw)
	got, ok := ev.(*androidsmsgateway.WebhookDelivered)
	if !ok {
		t.Fatalf("expected *WebhookDelivered, got %T", ev)
	}
	if got.Event != "sms:delivered" {
		t.Errorf("Event = %q, want sms:delivered", got.Event)
	}
	if got.Payload.MessageID != "msg-789" {
		t.Errorf("MessageID = %q, want msg-789", got.Payload.MessageID)
	}
	want := mustTime("2026-02-18T02:10:00.000+07:00")
	if !got.Payload.DeliveredAt.Equal(want) {
		t.Errorf("DeliveredAt = %v, want %v", got.Payload.DeliveredAt, want)
	}
}

func TestDecode_SystemPing(t *testing.T) {
	raw := buildRaw(t,
		"ffffffffceb0b1db00000192672f2204", "system:ping",
		"mjDoocQLCsOIDra_GthuI", "LreFUt-Z3sSq0JufY9uWB",
		map[string]any{
			"health": map[string]any{
				"checks": map[string]any{
					"messages:failed": map[string]any{
						"description": "Failed messages for last hour",
						"observedUnit": "messages", "observedValue": 0, "status": "pass",
					},
					"connection:status": map[string]any{
						"description": "Internet connection status",
						"observedUnit": "boolean", "observedValue": 1, "status": "pass",
					},
					"connection:transport": map[string]any{
						"description": "Network transport type",
						"observedUnit": "flags", "observedValue": 4, "status": "pass",
					},
					"connection:cellular": map[string]any{
						"description": "Cellular network type",
						"observedUnit": "index", "observedValue": 0, "status": "pass",
					},
					"battery:level": map[string]any{
						"description": "Battery level in percent",
						"observedUnit": "percent", "observedValue": 94, "status": "pass",
					},
					"battery:charging": map[string]any{
						"description": "Is the phone charging?",
						"observedUnit": "flags", "observedValue": 4, "status": "pass",
					},
				},
				"releaseId": 1,
				"status":    "pass",
				"version":   "1.0.0",
			},
		},
	)
	ev := decodeRaw(t, raw)
	got, ok := ev.(*androidsmsgateway.WebhookPing)
	if !ok {
		t.Fatalf("expected *WebhookPing, got %T", ev)
	}
	if got.Event != "system:ping" {
		t.Errorf("Event = %q, want system:ping", got.Event)
	}
	h := got.Payload.Health
	if h.Status != "pass" {
		t.Errorf("Health.Status = %q, want pass", h.Status)
	}
	if h.Version != "1.0.0" {
		t.Errorf("Health.Version = %q, want 1.0.0", h.Version)
	}
	if h.ReleaseID != 1 {
		t.Errorf("Health.ReleaseID = %d, want 1", h.ReleaseID)
	}
	c := h.Checks
	if c.BatteryLevel.ObservedValue != 94 {
		t.Errorf("BatteryLevel.ObservedValue = %v, want 94", c.BatteryLevel.ObservedValue)
	}
	if c.BatteryLevel.Status != "pass" {
		t.Errorf("BatteryLevel.Status = %q, want pass", c.BatteryLevel.Status)
	}
	if c.BatteryCharging.ObservedValue != 4 {
		t.Errorf("BatteryCharging.ObservedValue = %v, want 4", c.BatteryCharging.ObservedValue)
	}
	if c.ConnectionStatus.ObservedValue != 1 {
		t.Errorf("ConnectionStatus.ObservedValue = %v, want 1", c.ConnectionStatus.ObservedValue)
	}
	if c.ConnectionTransport.ObservedValue != 4 {
		t.Errorf("ConnectionTransport.ObservedValue = %v, want 4", c.ConnectionTransport.ObservedValue)
	}
	if c.ConnectionCellular.ObservedValue != 0 {
		t.Errorf("ConnectionCellular.ObservedValue = %v, want 0", c.ConnectionCellular.ObservedValue)
	}
	if c.MessagesFailed.ObservedValue != 0 {
		t.Errorf("MessagesFailed.ObservedValue = %v, want 0", c.MessagesFailed.ObservedValue)
	}
}

func TestDecode_UnknownEvent(t *testing.T) {
	raw := buildRaw(t, "dev1", "unknown:event", "id1", "wh1", map[string]any{})
	var wh androidsmsgateway.Webhook
	if err := json.Unmarshal(raw, &wh); err != nil {
		t.Fatalf("unmarshal: %v", err)
	}
	if _, err := androidsmsgateway.Decode(&wh); err == nil {
		t.Fatal("expected error for unknown event, got nil")
	}
}

func TestVerifySignature(t *testing.T) {
	const (
		secret    = "mysecretkey"
		payload   = `{"event":"sms:received"}`
		timestamp = "1700000000"
	)

	// Compute the expected signature.
	mac := hmac.New(sha256.New, []byte(secret))
	mac.Write([]byte(payload + timestamp))
	sig := hex.EncodeToString(mac.Sum(nil))

	if !androidsmsgateway.VerifySignature(secret, payload, timestamp, sig) {
		t.Error("VerifySignature returned false for valid signature")
	}
	if androidsmsgateway.VerifySignature(secret, payload, timestamp, "badsignature") {
		t.Error("VerifySignature returned true for invalid signature")
	}
	if androidsmsgateway.VerifySignature("wrongkey", payload, timestamp, sig) {
		t.Error("VerifySignature returned true for wrong key")
	}
}