package service

import (
	"database/sql"
	"errors"
	"fmt"
	"strings"

	"cmautobuy/admin/repository"
)

// ErrPddAssociationReplaceRequired 表示当前蝦皮商品已经关联了另一个 PDD 商品。
var ErrPddAssociationReplaceRequired = errors.New("更换 PDD 商品需要明确确认")

// AssociateShopeePdd 把蝦皮商品关联到 PDD 商品档案。
// 解析、建档/复活和关联更新在同一事务内完成，任一步失败都不留下半成品。
func AssociateShopeePdd(db *sql.DB, shopeeGoodsID, rawURL string, confirmReplace bool) (string, error) {
	shopeeGoodsID = strings.TrimSpace(shopeeGoodsID)
	rawURL = strings.TrimSpace(rawURL)
	pddGoodsID, err := ParsePddGoodsID(rawURL)
	if err != nil {
		return "", err
	}

	tx, err := db.Begin()
	if err != nil {
		return "", fmt.Errorf("开始关联 PDD 商品事务失败: %w", err)
	}
	defer tx.Rollback()

	product, err := repository.GetShopeeProductByGoodsID(tx, shopeeGoodsID)
	if err != nil {
		return "", err
	}
	if product == nil {
		return "", fmt.Errorf("蝦皮商品 %s 不存在", shopeeGoodsID)
	}
	if product.PddGoodsID != "" && product.PddGoodsID != pddGoodsID && !confirmReplace {
		return "", fmt.Errorf("%w：当前是 %s，新链接解析为 %s",
			ErrPddAssociationReplaceRequired, product.PddGoodsID, pddGoodsID)
	}
	if _, err := repository.EnsurePddProduct(tx, pddGoodsID, rawURL); err != nil {
		return "", err
	}
	if err := repository.UpdateShopeePddLink(tx, shopeeGoodsID, pddGoodsID, rawURL); err != nil {
		return "", err
	}
	if err := tx.Commit(); err != nil {
		return "", fmt.Errorf("提交 PDD 商品关联失败: %w", err)
	}
	return pddGoodsID, nil
}

// CreateShopeePddCollectTask 按蝦皮商品当前关联创建采集任务，避免相信表单里的 PDD ID。
func CreateShopeePddCollectTask(db *sql.DB, shopeeGoodsID string) (CollectTaskResult, error) {
	product, err := repository.GetShopeeProductByGoodsID(db, strings.TrimSpace(shopeeGoodsID))
	if err != nil {
		return CollectTaskResult{}, err
	}
	if product == nil {
		return CollectTaskResult{}, fmt.Errorf("蝦皮商品不存在")
	}
	if product.PddGoodsID == "" {
		return CollectTaskResult{}, fmt.Errorf("请先关联 PDD 商品")
	}
	return CreatePddCollectTasks(db, []string{product.PddGoodsID})
}

// AssociateSybPdd 从顺运宝明细解析出可信的蝦皮商品，再复用统一关联逻辑。
func AssociateSybPdd(db *sql.DB, sybID, rawURL string, confirmReplace bool) (string, error) {
	context, err := repository.GetSybOrderContext(db, strings.TrimSpace(sybID))
	if err != nil {
		return "", err
	}
	if context == nil {
		return "", fmt.Errorf("顺运宝明细不存在")
	}
	if context.Order.ShopeeGoodsID == "" {
		return "", fmt.Errorf("顺运宝未提供蝦皮商品 ID")
	}
	if context.Order.SpecKey == "" {
		return "", fmt.Errorf("顺运宝未提供规格，不能进入采购流程")
	}
	return AssociateShopeePdd(db, context.Order.ShopeeGoodsID, rawURL, confirmReplace)
}

// CreateSybPddCollectTask 按顺运宝明细当前关联创建采集任务。
func CreateSybPddCollectTask(db *sql.DB, sybID string) (CollectTaskResult, error) {
	context, err := repository.GetSybOrderContext(db, strings.TrimSpace(sybID))
	if err != nil {
		return CollectTaskResult{}, err
	}
	if context == nil {
		return CollectTaskResult{}, fmt.Errorf("顺运宝明细不存在")
	}
	return CreateShopeePddCollectTask(db, context.Order.ShopeeGoodsID)
}