%global __brp_check_rpaths %{nil}
%global __requires_exclude ^libmpi
%global packname  impermanentlosscalc
%global packver   0.1.0
%global rlibdir   /usr/local/lib/R/library

Name:             R-CRAN-%{packname}
Version:          0.1.0
Release:          1%{?dist}%{?buildtag}
Summary:          Calculate Impermanent Loss in Automated Market Maker (AMM) Liquidity Pools

License:          GPL-3
URL:              https://cran.r-project.org/package=%{packname}
Source0:          %{url}&version=%{packver}#/%{packname}_%{packver}.tar.gz


BuildRequires:    R-devel
Requires:         R-core
BuildArch:        noarch
BuildRequires:    R-CRAN-ggplot2 
Requires:         R-CRAN-ggplot2 

%description
Computes the key metrics for assessing the performance of a liquidity
provider (LP) position in a weighted multi-asset Automated Market Maker
(AMM) pool. Calculates the nominal and percentage impermanent loss (IL) by
comparing the portfolio value inside the pool (based on the weighted
geometric mean of price ratios) against the value of simply holding the
assets outside the pool (based on the weighted arithmetic mean). The
primary function, `impermanent_loss()`, incorporates the effect of earned
trading fees to provide the LP's net profit and loss relative to a holding
strategy, using a methodology derived from Tiruviluamala, N., Port, A.,
and Lewis, E. (2022) <doi:10.48550/arXiv.2203.11352>.

%prep
%setup -q -c -n %{packname}

# fix end of executable files
find -type f -executable -exec grep -Iq . {} \; -exec sed -i -e '$a\' {} \;
# prevent binary stripping
[ -d %{packname}/src ] && find %{packname}/src -type f -exec \
  sed -i 's@/usr/bin/strip@/usr/bin/true@g' {} \; || true
[ -d %{packname}/src ] && find %{packname}/src/Make* -type f -exec \
  sed -i 's@-g0@@g' {} \; || true
# don't allow local prefix in executable scripts
find -type f -executable -exec sed -Ei 's@#!( )*/usr/local/bin@#!/usr/bin@g' {} \;

%build

%install

mkdir -p %{buildroot}%{rlibdir}
%{_bindir}/R CMD INSTALL -l %{buildroot}%{rlibdir} %{packname}
test -d %{packname}/src && (cd %{packname}/src; rm -f *.o *.so)
rm -f %{buildroot}%{rlibdir}/R.css
# remove buildroot from installed files
find %{buildroot}%{rlibdir} -type f -exec sed -i "s@%{buildroot}@@g" {} \;

%files
%{rlibdir}/%{packname}