package service

import (
	"database/sql"
	"fmt"
	"sort"
	"strings"
	"time"

	"cmautobuy/admin/model"
	"cmautobuy/admin/repository"
)

func normalizeShopeeIDs(ids []string) []string {
	seen := map[string]struct{}{}
	result := make([]string, 0, len(ids))
	for _, id := range ids {
		id = strings.TrimSpace(id)
		if id == "" {
			continue
		}
		if _, ok := seen[id]; ok {
			continue
		}
		seen[id] = struct{}{}
		result = append(result, id)
	}
	sort.Strings(result)
	return result
}

// DeleteShopeeProducts 由管理员把商品移入可恢复的删除状态。
func DeleteShopeeProducts(db *sql.DB, actor *model.User, ids []string) (int64, error) {
	if actor == nil || !actor.IsAdmin() {
		return 0, ErrAdminRequired
	}
	ids = normalizeShopeeIDs(ids)
	if len(ids) == 0 {
		return 0, invalidInput("没有勾选任何蝦皮商品")
	}
	tx, err := db.Begin()
	if err != nil {
		return 0, err
	}
	defer tx.Rollback()
	busy, err := repository.ShopeeProductsWithActiveTasks(tx, ids)
	if err != nil {
		return 0, err
	}
	if len(busy) > 0 {
		return 0, invalidInput(fmt.Sprintf("商品 %s 仍有进行中的采集或采购任务，不能删除", strings.Join(busy, "、")))
	}
	count, err := repository.SetShopeeProductsDeleted(tx, ids, actor.UserID, time.Now().UTC().Format(model.TimeLayout))
	if err != nil {
		return 0, err
	}
	return count, tx.Commit()
}

// RestoreShopeeProducts 由管理员恢复软删除商品，原 SKU 和 PDD 关联保持不变。
func RestoreShopeeProducts(db *sql.DB, actor *model.User, ids []string) (int64, error) {
	if actor == nil || !actor.IsAdmin() {
		return 0, ErrAdminRequired
	}
	ids = normalizeShopeeIDs(ids)
	if len(ids) == 0 {
		return 0, invalidInput("没有勾选任何蝦皮商品")
	}
	tx, err := db.Begin()
	if err != nil {
		return 0, err
	}
	defer tx.Rollback()
	count, err := repository.SetShopeeProductsDeleted(tx, ids, actor.UserID, "")
	if err != nil {
		return 0, err
	}
	return count, tx.Commit()
}