// memPairingExchanger 的單元測試（DB-on FK 收尾，問題 #2）。
//
// 不帶 build tag：屬於預設 `go test ./...` 範圍（無需 Docker）。
// 驗證 in-memory exchanger 自建 device + 建 session token、且 session token 綁到該 device，
// 與 pairing_exchange_db_test.go 的 Postgres dbtest 對齊行為。
package api

import (
	"context"
	"testing"

	"github.com/stretchr/testify/assert"
	"github.com/stretchr/testify/require"

	"visiona-backend/internal/auth"
	"visiona-backend/internal/device"
)

func TestMemExchange_ProvisionCreatesDeviceAndSession(t *testing.T) {
	ctx := context.Background()
	devRepo := device.NewInMemoryRepository()
	sessions := auth.NewInMemorySessionTokenStore()
	exchanger := NewInMemoryPairingExchanger(devRepo, sessions)

	res, err := exchanger.Provision(ctx, "owner-1", "parent-hash", auth.SessionTokenTTL)
	require.NoError(t, err)
	require.NotEmpty(t, res.DeviceID)
	require.NotEmpty(t, res.SessionPlaintext)
	require.NotNil(t, res.SessionInfo)

	// device 自建、owner 對齊
	dev, err := devRepo.Get(ctx, res.DeviceID)
	require.NoError(t, err)
	assert.Equal(t, "owner-1", dev.OwnerUserID)
	assert.Equal(t, defaultPairedDeviceName, dev.Name)
	assert.Equal(t, defaultPairedDeviceType, dev.DeviceType)
	assert.NotNil(t, dev.PairedAt)

	// session token 綁到自建 device
	tok, err := sessions.Get(ctx, res.SessionPlaintext)
	require.NoError(t, err)
	assert.Equal(t, res.DeviceID, tok.DeviceID, "session token 應綁到自建 device")
	assert.Equal(t, "owner-1", tok.UserID)
	assert.Equal(t, "parent-hash", tok.ParentTokenHash)
}

func TestMemExchange_Provision_DistinctDevices(t *testing.T) {
	ctx := context.Background()
	exchanger := NewInMemoryPairingExchanger(
		device.NewInMemoryRepository(), auth.NewInMemorySessionTokenStore())

	res1, err := exchanger.Provision(ctx, "owner-1", "", auth.SessionTokenTTL)
	require.NoError(t, err)
	res2, err := exchanger.Provision(ctx, "owner-1", "", auth.SessionTokenTTL)
	require.NoError(t, err)

	assert.NotEqual(t, res1.DeviceID, res2.DeviceID)
	assert.NotEqual(t, res1.SessionPlaintext, res2.SessionPlaintext)
}