package store

import (
	"context"
	"errors"
	"fmt"
	"path/filepath"
	"testing"
	"time"

	"yovision/sense/internal/device"
)

func TestDefaultVideoQuotaRejectsSeventeenthChannel(t *testing.T) {
	t.Parallel()
	store := openTestStore(t)
	ctx := context.Background()
	if err := store.EnsureSite(ctx, device.Site{TenantID: "tenant-a", ID: "site-a", Name: "Site A"}); err != nil {
		t.Fatal(err)
	}
	for index := 1; index <= device.DefaultVideoChannels; index++ {
		if err := store.CreateDevice(ctx, videoDevice(index, "tenant-a", "site-a")); err != nil {
			t.Fatalf("create channel %d: %v", index, err)
		}
	}
	err := store.CreateDevice(ctx, videoDevice(17, "tenant-a", "site-a"))
	var quotaError *device.QuotaExceededError
	if !errors.As(err, &quotaError) || quotaError.Limit != 16 {
		t.Fatalf("expected 16-channel quota error, got %v", err)
	}
}

func TestConfiguredMaximumAccepts128AndRejects129(t *testing.T) {
	t.Parallel()
	store := openTestStore(t)
	ctx := context.Background()
	if err := store.EnsureSite(ctx, device.Site{
		TenantID: "tenant-b", ID: "site-b", Name: "Site B", MaxVideoChannels: 128,
	}); err != nil {
		t.Fatal(err)
	}
	for index := 1; index <= 128; index++ {
		if err := store.CreateDevice(ctx, videoDevice(index, "tenant-b", "site-b")); err != nil {
			t.Fatalf("create channel %d: %v", index, err)
		}
	}
	err := store.CreateDevice(ctx, videoDevice(129, "tenant-b", "site-b"))
	var quotaError *device.QuotaExceededError
	if !errors.As(err, &quotaError) || quotaError.Limit != 128 {
		t.Fatalf("expected 128-channel quota error, got %v", err)
	}
}

func TestSiteRejectsCapacityAbove128(t *testing.T) {
	t.Parallel()
	store := openTestStore(t)
	err := store.EnsureSite(context.Background(), device.Site{
		TenantID: "tenant", ID: "site", Name: "Site", MaxVideoChannels: 129,
	})
	if err == nil {
		t.Fatal("expected capacity 129 to be rejected")
	}
}

func TestNonVideoDeviceDoesNotConsumeVideoQuota(t *testing.T) {
	t.Parallel()
	store := openTestStore(t)
	ctx := context.Background()
	if err := store.EnsureSite(ctx, device.Site{
		TenantID: "tenant", ID: "site", Name: "Site", MaxVideoChannels: 1,
	}); err != nil {
		t.Fatal(err)
	}
	radar := device.Device{
		ID: "radar-1", TenantID: "tenant", SiteID: "site", SerialNumber: "radar-1",
		Name: "Radar", Modality: device.ModalityRadar,
		Capabilities: []device.Capability{device.CapabilityTelemetry},
		DesiredState: device.DesiredEnabled, ActualState: device.ActualPending,
	}
	if err := store.CreateDevice(ctx, radar); err != nil {
		t.Fatal(err)
	}
	if err := store.CreateDevice(ctx, videoDevice(1, "tenant", "site")); err != nil {
		t.Fatalf("video channel should remain available: %v", err)
	}
}

func TestEnablingSeventeenthVideoDeviceIsRejected(t *testing.T) {
	t.Parallel()
	store := openTestStore(t)
	ctx := context.Background()
	if err := store.EnsureSite(ctx, device.Site{TenantID: "tenant-c", ID: "site-c", Name: "Site C"}); err != nil {
		t.Fatal(err)
	}
	for index := 1; index <= 17; index++ {
		value := videoDevice(index, "tenant-c", "site-c")
		if index == 17 {
			value.DesiredState = device.DesiredDisabled
		}
		if err := store.CreateDevice(ctx, value); err != nil {
			t.Fatalf("create device %d: %v", index, err)
		}
	}
	err := store.SetDesiredState(ctx, "camera-017", device.DesiredEnabled)
	var quotaError *device.QuotaExceededError
	if !errors.As(err, &quotaError) || quotaError.Limit != 16 {
		t.Fatalf("expected enable to enforce quota, got %v", err)
	}
	value, err := store.GetDevice(ctx, "camera-017")
	if err != nil {
		t.Fatal(err)
	}
	if value.DesiredState != device.DesiredDisabled {
		t.Fatal("failed enable must leave the existing desired state unchanged")
	}
}

func TestLowerQuotaDoesNotDisableExistingStreams(t *testing.T) {
	t.Parallel()
	store := openTestStore(t)
	ctx := context.Background()
	if err := store.EnsureSite(ctx, device.Site{
		TenantID: "tenant-d", ID: "site-d", Name: "Site D", MaxVideoChannels: 2,
	}); err != nil {
		t.Fatal(err)
	}
	for index := 1; index <= 2; index++ {
		if err := store.CreateDevice(ctx, videoDevice(index, "tenant-d", "site-d")); err != nil {
			t.Fatal(err)
		}
	}
	if err := store.EnsureSite(ctx, device.Site{
		TenantID: "tenant-d", ID: "site-d", Name: "Site D", MaxVideoChannels: 1,
	}); err != nil {
		t.Fatal(err)
	}
	for index := 1; index <= 2; index++ {
		value, err := store.GetDevice(ctx, fmt.Sprintf("camera-%03d", index))
		if err != nil {
			t.Fatal(err)
		}
		if value.DesiredState != device.DesiredEnabled {
			t.Fatalf("existing channel %d was disabled", index)
		}
	}
}

func TestConvergenceSnapshotAndRuntimeReconcileRequest(t *testing.T) {
	t.Parallel()
	store := openTestStore(t)
	ctx := context.Background()
	if err := store.EnsureSite(ctx, device.Site{TenantID: "tenant", ID: "site", Name: "Site"}); err != nil {
		t.Fatal(err)
	}
	if err := store.CreateDevice(ctx, videoDevice(1, "tenant", "site")); err != nil {
		t.Fatal(err)
	}
	now := time.Date(2026, 8, 7, 0, 0, 0, 0, time.UTC)
	if err := store.MarkReconciled(ctx, "camera-001", 1, now); err != nil {
		t.Fatal(err)
	}
	if err := store.UpdateActualState(ctx, "camera-001", device.ActualOnline, now); err != nil {
		t.Fatal(err)
	}
	snapshot, err := store.ConvergenceSnapshot(ctx)
	if err != nil {
		t.Fatal(err)
	}
	if snapshot.Total != 1 || snapshot.Unconverged != 0 {
		t.Fatalf("expected converged snapshot, got %+v", snapshot)
	}
	if err := store.RequestReconcile(ctx, "camera-001", now.Add(time.Second)); err != nil {
		t.Fatal(err)
	}
	snapshot, err = store.ConvergenceSnapshot(ctx)
	if err != nil {
		t.Fatal(err)
	}
	if snapshot.Unconverged != 1 || snapshot.Devices[0].ObservedGeneration != 0 {
		t.Fatalf("runtime loss must invalidate convergence: %+v", snapshot)
	}
}

func openTestStore(t *testing.T) *SQLite {
	t.Helper()
	dsn := "file:" + filepath.ToSlash(filepath.Join(t.TempDir(), "sense.db"))
	store, err := OpenSQLite(context.Background(), dsn)
	if err != nil {
		t.Fatal(err)
	}
	t.Cleanup(func() { _ = store.Close() })
	return store
}

func videoDevice(index int, tenantID, siteID string) device.Device {
	id := fmt.Sprintf("camera-%03d", index)
	return device.Device{
		ID: id, TenantID: tenantID, SiteID: siteID, SerialNumber: id, Name: id,
		Modality:     device.ModalityVideo,
		Capabilities: []device.Capability{device.CapabilityVideoCapture, device.CapabilitySpatialRule},
		DesiredState: device.DesiredEnabled, ActualState: device.ActualPending,
		EndpointRef: "onvif://" + id, CredentialRef: "secret://" + id,
		PathName: "sense/" + tenantID + "/" + siteID + "/" + id,
	}
}