package logic

import (
	"context"
	"errors"

	"muyu-apiserver/model"
	"muyu-apiserver/rpc/system/internal/svc"
	"muyu-apiserver/rpc/system/pb"

	"github.com/zeromicro/go-zero/core/logx"
	"golang.org/x/crypto/bcrypt"
	"google.golang.org/grpc/codes"
	"google.golang.org/grpc/status"
)

type ChangePasswordLogic struct {
	ctx    context.Context
	svcCtx *svc.ServiceContext
	logx.Logger
}

func NewChangePasswordLogic(ctx context.Context, svcCtx *svc.ServiceContext) *ChangePasswordLogic {
	return &ChangePasswordLogic{
		ctx:    ctx,
		svcCtx: svcCtx,
		Logger: logx.WithContext(ctx),
	}
}

func (l *ChangePasswordLogic) ChangePassword(in *pb.ChangePasswordReq) (*pb.Empty, error) {
	user, err := l.svcCtx.UserModel.FindOneByUserId(l.ctx, in.UserId)
	if err != nil {
		if errors.Is(err, model.ErrNotFound) {
			return nil, status.Error(codes.NotFound, "user not found")
		}
		return nil, status.Error(codes.Internal, err.Error())
	}

	err = bcrypt.CompareHashAndPassword([]byte(user.Password), []byte(in.OldPassword))
	if err != nil {
		return nil, status.Error(codes.Unauthenticated, "incorrect old password")
	}

	hashedPw, err := bcrypt.GenerateFromPassword([]byte(in.NewPassword), bcrypt.DefaultCost)
	if err != nil {
		return nil, status.Error(codes.Internal, err.Error())
	}

	user.Password = string(hashedPw)
	err = l.svcCtx.UserModel.Update(l.ctx, user)
	if err != nil {
		return nil, status.Error(codes.Internal, err.Error())
	}

	return &pb.Empty{}, nil
}