package repository

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

	"cmautobuy/admin/model"
)

// GetSpecMapping 读取某个蝦皮商品的顺运宝规格在指定 PDD 商品下的映射。
func GetSpecMapping(q Execer, shopeeGoodsID, specKey, pddGoodsID string) (*model.SpecMapping, error) {
	var m model.SpecMapping
	var mappedBy sql.NullString
	err := q.QueryRow(`
		SELECT shopee_goods_id, spec_key, pdd_goods_id, pdd_option_key,
		       pdd_options, spec_raw, mapped_at, mapped_by
		  FROM spec_mappings
		 WHERE shopee_goods_id = ? AND spec_key = ? AND pdd_goods_id = ?`,
		shopeeGoodsID, specKey, pddGoodsID).Scan(
		&m.ShopeeGoodsID, &m.SpecKey, &m.PddGoodsID, &m.PddOptionKey,
		&m.PddOptions, &m.SpecRaw, &m.MappedAt, &mappedBy)
	if errors.Is(err, sql.ErrNoRows) {
		return nil, nil
	}
	if err != nil {
		return nil, fmt.Errorf("查询规格映射失败: %w", err)
	}
	m.MappedBy = mappedBy.String
	return &m, nil
}

// UpsertSpecMapping 保存可复用规格映射，唯一键包含当前 PDD 商品。
func UpsertSpecMapping(q Execer, m model.SpecMapping) error {
	_, err := q.Exec(`
		INSERT INTO spec_mappings
		       (shopee_goods_id, spec_key, pdd_goods_id, pdd_option_key,
		        pdd_options, spec_raw, mapped_at, mapped_by)
		VALUES (?, ?, ?, ?, ?, ?, ?, ?)
		ON DUPLICATE KEY UPDATE
		       pdd_option_key = VALUES(pdd_option_key),
		       pdd_options = VALUES(pdd_options),
		       spec_raw = VALUES(spec_raw),
		       mapped_at = VALUES(mapped_at),
		       mapped_by = VALUES(mapped_by)`,
		m.ShopeeGoodsID, m.SpecKey, m.PddGoodsID, m.PddOptionKey,
		m.PddOptions, m.SpecRaw, m.MappedAt, nullableText(m.MappedBy))
	if err != nil {
		return fmt.Errorf("保存规格映射失败: %w", err)
	}
	return nil
}

func InsertSpecMappingDecision(q Execer, d model.SpecMappingDecision) error {
	_, err := q.Exec(`INSERT INTO spec_mapping_decisions
		(shopee_goods_id,spec_key,pdd_goods_id,rules_version,suggested_option_key,
		 chosen_option_key,accepted,decided_by,decided_at) VALUES (?,?,?,?,?,?,?,?,?)`,
		d.ShopeeGoodsID, d.SpecKey, d.PddGoodsID, d.RulesVersion, nullableText(d.SuggestedOptionKey),
		d.ChosenOptionKey, d.Accepted, nullableText(d.DecidedBy), d.DecidedAt)
	if err != nil {
		return fmt.Errorf("写入规格匹配决策审计失败: %w", err)
	}
	return nil
}