package main

import (
	"context"
	"log/slog"
	"time"

	"github.com/google/uuid"

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

// seedDemoData 在啟動時塞入示範資料，方便本機開發 / demo 不必跑完整 pairing。
//
// 觸發條件：VISIONA_SEED_DEMO_DATA=true
//
// 內容：
//   - 一個示範 device（KL520）
//   - 一個示範 model（YOLOv5 Face）
//   - 一個示範 pairing token（log 出來方便手動 copy）
//
// 注意：
//   - 失敗只 log warning，不阻擋啟動
//   - 重複呼叫會產生重複資料；本函式只該被呼叫一次（main 已保證）
//   - **不要**在生產環境啟用此 flag
func seedDemoData(
	devRepo device.Repository,
	mdlRepo model.Repository,
	pairings auth.PairingStore,
	userID string,
	log *slog.Logger,
) error {
	ctx, cancel := context.WithTimeout(context.Background(), 5*time.Second)
	defer cancel()

	now := time.Now().UTC()

	// 1. Demo device
	dev := &device.Device{
		ID:           "demo-device-" + uuid.NewString()[:8],
		OwnerUserID:  userID,
		Name:         "Demo KL520 (seeded)",
		DeviceType:   "kl520",
		SerialNumber: "DEMO-SN-001",
		RemoteStatus: device.RemoteStatusOffline,
		Status:       device.USBStatusUnknown,
		CreatedAt:    now,
		UpdatedAt:    now,
	}
	if err := devRepo.Save(ctx, dev); err != nil {
		log.Warn("seed: device save failed", "error", err)
	} else {
		log.Info("seed: demo device created", "id", dev.ID, "name", dev.Name)
	}

	// 2. Demo model
	mdl := &model.Model{
		ID:          "demo-model-" + uuid.NewString()[:8],
		OwnerUserID: userID,
		Name:        "YOLOv5 Face (seeded)",
		TargetChip:  "kl520",
		FileSize:    1024 * 1024, // 1 MB
		Source:      model.SourceUploaded,
		StorageKey:  "models/" + userID + "/demo.nef",
		CreatedAt:   now,
		UpdatedAt:   now,
		UploadedAt:  &now,
	}
	if err := mdlRepo.Save(ctx, mdl); err != nil {
		log.Warn("seed: model save failed", "error", err)
	} else {
		log.Info("seed: demo model created", "id", mdl.ID, "name", mdl.Name)
	}

	// 3. Demo pairing token（log plaintext 方便開發 — 雛形 demo 用，生產禁用）
	pt, _, err := pairings.Create(ctx, userID, 24*time.Hour)
	if err != nil {
		log.Warn("seed: pairing token create failed", "error", err)
	} else {
		log.Info("seed: demo pairing token created (use for local-tool tunnel)",
			"token", pt,
			"ttl", "24h")
	}

	return nil
}