#!/bin/bash
set -e
#
# HEIF codec.
# Copyright (c) 2018 struktur AG, Joachim Bauch <bauch@struktur.de>
#
# This file is part of libheif.
#
# libheif is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# libheif is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with libheif.  If not, see <http://www.gnu.org/licenses/>.
#
ROOT="$( cd "$( dirname "${BASH_SOURCE[0]}" )" && pwd )"

# Assume running from ".git/hooks" folder.
CPPLINT="$ROOT/../../scripts/cpplint.py"
if [ ! -x "$CPPLINT" ]; then
    # Running from "scripts" folder.
    CPPLINT="$ROOT/cpplint.py"
fi

PYTHON=$(which python || true)
if [ -z "$PYTHON" ]; then
    PYTHON=$(which python3 || true)
fi

# Run cpplint against changed C/C++ files and check if all enums from the API
# are also updated in the Emscripten/Go files.
check_c_enums=
check_go_enums=
logged_python=
for file in `git diff-index --cached --name-only HEAD --diff-filter=ACMR| grep -E "\.cc$|\.h$|\.c$"` ; do
    if [ -z "$PYTHON" ]; then
        if [ -z "$logged_python" ]; then
            echo "WARNING: Could not find valid Python interpreter to run cpplint, skipping checks..."
            logged_python=1
        fi
    else
        "$PYTHON" "$CPPLINT" "$file"
    fi
    if [ "$file" = "libheif/heif.h" ] ; then
        check_c_enums=1
        check_go_enums=1
    fi
    if [ "$file" = "libheif/heif_emscripten.h" ] ; then
        check_c_enums=1
    fi
done

if [ "$check_c_enums" = "1" ]; then
    CHECK_EMSCRIPTEN="$ROOT/../../scripts/check-emscripten-enums.sh"
    if [ ! -x "$CHECK_EMSCRIPTEN" ]; then
        # Running from "scripts" folder.
        CHECK_EMSCRIPTEN="$ROOT/check-emscripten-enums.sh"
    fi
    "$CHECK_EMSCRIPTEN"
fi

# Check format of Go files
for file in `git diff-index --cached --name-only HEAD --diff-filter=ACMR| grep "\.go$"` ; do
    # nf is the temporary checkout. This makes sure we check against the
    # revision in the index (and not the checked out version).
    nf=`git checkout-index --temp ${file} | cut -f 1`
    newfile=`mktemp /tmp/${nf}.XXXXXX` || exit 1
    gofmt ${nf} > "${newfile}" 2>> /dev/null
    set +e
    diff -u -p --label "$file" "${nf}" --label "$file (formatted)" "${newfile}"
    r=$?
    set -e
    rm "${newfile}"
    rm "${nf}"
    if [ $r != 0 ] ; then
echo "================================================================================================="
echo " Code format error in: $file                                                                      "
echo "                                                                                                 "
echo " Please fix before committing. Don't forget to run git add before trying to commit again.        "
echo " If the whole file is to be committed, this should work (run from the top-level directory):      "
echo "                                                                                                 "
echo "   go fmt $file; git add $file; git commit"
echo "                                                                                                 "
echo "================================================================================================="
        exit 1
    fi
    if [ "$file" = "go/heif/heif.go" ] ; then
        check_go_enums=1
    fi
done

if [ "$check_go_enums" = "1" ]; then
    CHECK_GO="$ROOT/../../scripts/check-go-enums.sh"
    if [ ! -x "$CHECK_GO" ]; then
        # Running from "scripts" folder.
        CHECK_GO="$ROOT/check-go-enums.sh"
    fi
    "$CHECK_GO"
fi