package approval

import (
	"context"
	"strings"

	"gorm.io/gorm"

	"github.com/break/junhong_cmp_fiber/pkg/constants"
	"github.com/break/junhong_cmp_fiber/pkg/errors"
)

// ConfirmSubmissionFailed 在业务消费事务内锁定审批实例并确认其仍为“提交失败”，返回可对外展示的失败原因。
// 实例已不是提交失败（例如被恢复重放）时 ok 为 false，业务消费者应不改变业务单。
// 原因只返回固定白名单文案，禁止透传企微原文或内部错误。
func ConfirmSubmissionFailed(ctx context.Context, tx *gorm.DB, instanceID uint) (string, bool, error) {
	var row struct {
		Status    int    `gorm:"column:status"`
		LastError string `gorm:"column:last_error"`
	}
	result := tx.WithContext(ctx).Raw(
		`SELECT ai.status, COALESCE(wc.last_error, '') AS last_error
		   FROM tb_approval_instance ai
		   LEFT JOIN tb_wecom_approval_context wc ON wc.approval_instance_id = ai.id
		  WHERE ai.id = ? FOR UPDATE OF ai`, instanceID).Scan(&row)
	if result.Error != nil {
		return "", false, errors.Wrap(errors.CodeDatabaseError, result.Error, "锁定提交失败审批实例失败")
	}
	if result.RowsAffected == 0 {
		return "", false, errors.New(errors.CodeNotFound, "审批实例不存在")
	}
	if row.Status != constants.ApprovalStatusSubmissionFailed {
		return "", false, nil
	}
	return SubmissionFailureReason(row.LastError), true, nil
}

// SubmissionFailureReason 把企微提交失败原文转换为稳定白名单文案。
func SubmissionFailureReason(lastError string) string {
	if strings.TrimSpace(lastError) == "" {
		return constants.ApprovalSubmissionFailedStatusName
	}
	return constants.ApprovalSubmissionFailedReason
}