package repository

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

	"cmautobuy/admin/model"
)

// InnerCodeImportOutcome 说明幂等导入是新增还是更新。
type InnerCodeImportOutcome string

const (
	InnerCodeImportCreated InnerCodeImportOutcome = "created"
	InnerCodeImportUpdated InnerCodeImportOutcome = "updated"
)

// UpsertInnerCodeImportRow 按已确认业务键写入一行。
// 必须在事务中调用；先锁定业务键，避免另一个唯一键冲突时更新错行。
func UpsertInnerCodeImportRow(tx *sql.Tx, row model.InnerCodeImportRow, now string) (InnerCodeImportOutcome, error) {
	var id int64
	err := tx.QueryRow(`
		SELECT id FROM syb_inner_code_records
		 WHERE business_date=? AND order_number=? AND stall=? AND spec_key=?
		 FOR UPDATE`, row.BusinessDate, row.OrderNumber, row.Stall, row.SpecKey).Scan(&id)
	if err != nil && !errors.Is(err, sql.ErrNoRows) {
		return "", fmt.Errorf("锁定档口入库码业务键失败: %w", err)
	}
	if errors.Is(err, sql.ErrNoRows) {
		_, err = tx.Exec(`
			INSERT INTO syb_inner_code_records (
				business_date,source_row,print_sequence,order_number,shop_name,stall,
				spec_raw,spec_key,inner_code,source_duplicate_count,status,
				created_by_user_id,created_at,updated_at
			) VALUES (?,?,?,?,?,?,?,?,?,?,'pending',?,?,?)`,
			row.BusinessDate, row.SourceRow, nullablePositiveInt(row.PrintSequence), row.OrderNumber,
			nullableString(row.ShopName), row.Stall, row.SpecRaw, row.SpecKey, row.InnerCode,
			row.SourceDuplicateCount, row.CreatedByUserID, now, now)
		if err != nil {
			return "", fmt.Errorf("新增档口入库码记录失败: %w", err)
		}
		return InnerCodeImportCreated, nil
	}

	_, err = tx.Exec(`
		UPDATE syb_inner_code_records
		   SET source_row=?,print_sequence=?,shop_name=?,spec_raw=?,inner_code=?,
		       source_duplicate_count=?,
		       status=CASE WHEN status IN ('updated','already_filled','applying','needs_check')
		                   THEN status ELSE 'pending' END,
		       stock_id=CASE WHEN status IN ('updated','already_filled','applying','needs_check') THEN stock_id ELSE NULL END,
		       detail_id=CASE WHEN status IN ('updated','already_filled','applying','needs_check') THEN detail_id ELSE NULL END,
		       syb_spec=CASE WHEN status IN ('updated','already_filled','applying','needs_check') THEN syb_spec ELSE NULL END,
		       syb_sku=CASE WHEN status IN ('updated','already_filled','applying','needs_check') THEN syb_sku ELSE NULL END,
		       syb_variation_sku=CASE WHEN status IN ('updated','already_filled','applying','needs_check') THEN syb_variation_sku ELSE NULL END,
		       purchase_platform=CASE WHEN status IN ('updated','already_filled','applying','needs_check') THEN purchase_platform ELSE NULL END,
		       purchase_code=CASE WHEN status IN ('updated','already_filled','applying','needs_check') THEN purchase_code ELSE NULL END,
		       remote_inner_code=CASE WHEN status IN ('updated','already_filled','applying','needs_check') THEN remote_inner_code ELSE NULL END,
		       result_message=CASE WHEN status IN ('updated','already_filled','applying','needs_check') THEN result_message ELSE NULL END,
		       planned_at=CASE WHEN status IN ('updated','already_filled','applying','needs_check') THEN planned_at ELSE NULL END,
		       updated_at=?
		 WHERE id=?`,
		row.SourceRow, nullablePositiveInt(row.PrintSequence), nullableString(row.ShopName), row.SpecRaw,
		row.InnerCode, row.SourceDuplicateCount, now, id)
	if err != nil {
		return "", fmt.Errorf("更新档口入库码导入记录失败: %w", err)
	}
	return InnerCodeImportUpdated, nil
}

func nullablePositiveInt(value int) any {
	if value <= 0 {
		return nil
	}
	return value
}

func nullableString(value string) any {
	if value == "" {
		return nil
	}
	return value
}