package pay

import (
	"context"
	"strings"

	"chatappgateway/internal/apperr"
	commonpb "gitea.haiyihy.com/hy/chatappcommon/proto"
)

// Client 定义支付服务 gRPC 客户端能力。
type Client interface {
	Pay(ctx context.Context, request *commonpb.PayRequest) (*commonpb.PayResponse, error)
}

// Request 描述客户端发起支付的请求。
type Request struct {
	OrderNo   string `json:"order_no"`
	UserID    string `json:"user_id"`
	Amount    string `json:"amount"`
	Currency  string `json:"currency"`
	PayMethod string `json:"pay_method"`
	Subject   string `json:"subject"`
}

// Service 负责支付请求校验和下游支付调用。
type Service struct {
	client Client
}

// New 创建支付查询服务。
func New(client Client) *Service {
	return &Service{client: client}
}

// Pay 校验支付请求并调用支付服务。
func (s *Service) Pay(ctx context.Context, request Request) (*commonpb.PayResponse, error) {
	normalized := Request{
		OrderNo:   strings.TrimSpace(request.OrderNo),
		UserID:    strings.TrimSpace(request.UserID),
		Amount:    strings.TrimSpace(request.Amount),
		Currency:  strings.TrimSpace(request.Currency),
		PayMethod: strings.TrimSpace(request.PayMethod),
		Subject:   strings.TrimSpace(request.Subject),
	}

	if normalized.OrderNo == "" {
		return nil, apperr.New(400, "bad_request", "order_no is required")
	}
	if normalized.UserID == "" {
		return nil, apperr.New(400, "bad_request", "user_id is required")
	}
	if normalized.Amount == "" {
		return nil, apperr.New(400, "bad_request", "amount is required")
	}

	return s.client.Pay(ctx, &commonpb.PayRequest{
		OrderNo:   normalized.OrderNo,
		UserId:    normalized.UserID,
		Amount:    normalized.Amount,
		Currency:  normalized.Currency,
		PayMethod: normalized.PayMethod,
		Subject:   normalized.Subject,
	})
}