package auth

import (
	"context"
	"strings"

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

// Client 定义用户服务 gRPC 客户端能力。
type Client interface {
	Register(ctx context.Context, request *commonpb.RegisterRequest) (*commonpb.RegisterResponse, error)
}

// Service 负责注册参数校验、字段归一化和下游调用。
type Service struct {
	client Client
}

// RegisterRequest 描述 HTTP 层的注册入参。
type RegisterRequest struct {
	Account     string `json:"account"`
	Password    string `json:"password"`
	CountryCode string `json:"country_code"`
	VerifyCode  string `json:"verify_code"`
	Nickname    string `json:"nickname"`
	DeviceID    string `json:"device_id"`
	Platform    string `json:"platform"`
	AppVersion  string `json:"app_version"`
}

// New 创建注册服务。
func New(client Client) *Service {
	return &Service{client: client}
}

// Register 校验客户端请求并转成 gRPC 请求。
func (s *Service) Register(ctx context.Context, request RegisterRequest) (*commonpb.RegisterResponse, error) {
	normalized, err := normalize(request)
	if err != nil {
		return nil, err
	}

	return s.client.Register(ctx, &commonpb.RegisterRequest{
		Account:     normalized.Account,
		Password:    normalized.Password,
		CountryCode: normalized.CountryCode,
		VerifyCode:  normalized.VerifyCode,
		Nickname:    normalized.Nickname,
		DeviceId:    normalized.DeviceID,
		Platform:    normalized.Platform,
		AppVersion:  normalized.AppVersion,
	})
}

func normalize(request RegisterRequest) (RegisterRequest, error) {
	normalized := RegisterRequest{
		Account:     strings.TrimSpace(request.Account),
		Password:    strings.TrimSpace(request.Password),
		CountryCode: strings.TrimSpace(request.CountryCode),
		VerifyCode:  strings.TrimSpace(request.VerifyCode),
		Nickname:    strings.TrimSpace(request.Nickname),
		DeviceID:    strings.TrimSpace(request.DeviceID),
		Platform:    strings.TrimSpace(request.Platform),
		AppVersion:  strings.TrimSpace(request.AppVersion),
	}

	if normalized.Account == "" {
		return RegisterRequest{}, apperr.New(400, "bad_request", "account is required")
	}
	if normalized.Password == "" {
		return RegisterRequest{}, apperr.New(400, "bad_request", "password is required")
	}
	if normalized.Nickname == "" {
		normalized.Nickname = normalized.Account
	}

	return normalized, nil
}