#!/bin/bash
# This script gets the test coverage for mlpack_test.
test_case="ALL"
gcov_loc=""
token=""
clean=true
current_log_file=`date +'%Y.%h.%d:%H:%M:%S-coverage.log'`
current_coverage_file=`date +'%Y.%h.%d:%H:%M:%S-coverage.info'`
max_cov_count=50000

# default directories
root_dir="../"

# Extract arguments.
for i in "$@"
do
case $i in
    -h|--help)
    echo "Usage: mlpack_coverage --help|-h"
    echo "       mlpack_coverage [-r=test_suite] [-g=gcov_tool_location]"
    echo "                       [--token=coveralls_token]"
    echo "Optional parameters:"
    echo "    -n|--no_test               Do not run test before coverage computation"
    echo "    -r|--run_test              Run tests with specific test suite"
    echo "       --no_clean              Do not remove existing gcda file"
    echo "    -g|--gcov_tool_location    Gcov location if not default"
    echo "    -t|--token                 Upload to coveralls with given token"
    echo "       --max_cov_count         Max line coverage count (default 50000)"
    echo "       --root_dir              Set the root directory from which gcov will be called. (default ../)"
    exit 0
    shift
    ;;
    -n|--no_test)
    test_case=""
    shift
    ;;
    -r=*|--run_test=*)
    test_case="${i#*=}"
    shift # past argument=value
    ;;
    --no_clean)
    clean=false
    shift
    ;;
    -g=*|--gcov_tool_location=*)
    gcov_loc="${i#*=}"
    shift # past argument=value
    ;;
    -t=*|--token=*)
    token="${i#*=}"
    shift # past argument=value
    ;;
    --max_cov_count)
    max_cov_count="${i#*=}"
    shift
    ;;
    --root_dir=*)
    root_dir="${i#*=}"
    shift
    ;;
    *)
            # unknown option
    ;;
esac
done

if [ "$clean" = true ]; then
  echo "Deleting existing coverage data..."
  find ./ -name "*.gcda" -type f -delete
fi

# Initial pass.
echo "Generating primary coverage report."
[[ -d ./coveragehistory/ ]] || mkdir coveragehistory
lcov -b . -c -i -d ./ -o .coverage.wtest.base > ./coveragehistory/$current_log_file

# Run the tests.
if [ "$test_case" = "ALL" ]; then
  echo "Running all the tests..."
  "@CMAKE_BINARY_DIR@"/bin/mlpack_test
elif ! [ "$test_case" = "" ]; then
  echo "Running test suite: $test_case"
  "@CMAKE_BINARY_DIR@"/bin/mlpack_test --run_test=$test_case
fi

# Generate coverage based on executed tests.
echo "Computing coverage..."
if [ "$gcov_loc" = "" ];
then lcov -b . -c -d ./ -o .coverage.wtest.run >> ./coveragehistory/$current_log_file
else
  lcov -b . -c -d ./ -o .coverage.wtest.run --gcov-tool=$gcov_loc >> ./coveragehistory/$current_log_file
fi

echo "Filtering coverage files..."
# Clear negative entries in coverage file
sed -E 's/-([0-9]+)/$max_cov_count/g' -i .coverage.wtest.run
# Merge coverage tracefiles.
lcov -a .coverage.wtest.base -a .coverage.wtest.run  -o .coverage.total >> ./coveragehistory/$current_log_file

# Filtering, extracting project files.
lcov -e .coverage.total "@CMAKE_CURRENT_SOURCE_DIR@/src/mlpack/*" -o .coverage.total.filtered >> ./coveragehistory/$current_log_file

# Filtering, removing test-files and main.cpp.
lcov -r .coverage.total.filtered "@CMAKE_CURRENT_SOURCE_DIR@/src/mlpack/*/*_main.cpp" -o .coverage.total.filtered >> ./coveragehistory/$current_log_file
lcov -r .coverage.total.filtered "@CMAKE_CURRENT_SOURCE_DIR@/src/mlpack/tests/*" -o .coverage.total.filtered >> ./coveragehistory/$current_log_file

# Remove untestable files.
lcov -r .coverage.total.filtered "@CMAKE_CURRENT_SOURCE_DIR@/src/mlpack/core/util/gitversion.hpp" -o .coverage.total.filtered >> ./coveragehistory/$current_log_file
lcov -r .coverage.total.filtered "@CMAKE_CURRENT_SOURCE_DIR@/src/mlpack/core/util/arma_config.hpp" -o .coverage.total.filtered >> ./coveragehistory/$current_log_file

# Extra:  Replace /build/ with /src/ to unify directories.
cat .coverage.total.filtered > .coverage.total

# Extra: Clear up previous data, create html folder.
if [[ -d ./coverage/ ]] ; then
    rm -rf ./coverage/*
else
    mkdir coverage
fi

# Step 9: Generate webpage.
genhtml -o ./coverage/ .coverage.total

# Extra: Preserve coverage file in coveragehistory folder.
coverage_file=$current_coverage_file
cp .coverage.total ./coveragehistory/$current_coverage_file

# Clean temporary coverage files.
#rm .coverage.*

# Upload the result to coveralls if token is provided.
if ! [ "$token" = "" ]; then
  cpp-coveralls -n -r $root_dir -b $root_dir -l ./coveragehistory/$current_coverage_file -t "$token" --max-cov-count $max_cov_count
fi