#!/bin/bash

if [[ -z "${CIRCLE_PR_NUMBER// }" ]]; then
    echo "Skipping check for internal PRs"
    exit 0
fi

echo_headline () {
    printf '=%.0s' {1..70}
    printf "\n$1\n"
    printf '=%.0s' {1..70}
    echo
}

pr_patch_url="https://patch-diff.githubusercontent.com/raw/"
pr_patch_url+="${CIRCLE_PROJECT_USERNAME}/"
pr_patch_url+="${CIRCLE_PROJECT_REPONAME}/pull/"
pr_patch_url+="${CIRCLE_PR_NUMBER}.patch"

curl "${pr_patch_url}" --output /tmp/patch --silent
first_commit=$(echo $(head -n 1 /tmp/patch) | sed -n 's/From \([a-zA-Z0-9]\+\).*/\1/p')

if [[ -z "${first_commit// }" ]]; then
    echo "Can't fist commit commit"
    exit 1
else
    echo "First commit: ${first_commit}"
fi

git diff --name-only "${first_commit}^" HEAD > /tmp/changed_files
if [ $? -ne 0 ]; then
    echo "Git diff failed"
    exit 1
fi

echo_headline "Testing changed ORG files with spacefmt"
changed_f_as_args=()
while read p
do
    if [ -f "$p" ]; then
        if [ ${p: -4} == ".org" ]; then
            changed_f_as_args+=("${p}")
            echo "Checking $p file"
            ./core/tools/spacefmt/spacefmt -f "$p"
            if [ $? -ne 0 ]; then
                echo "spacefmt failed"
                exit 2
            fi
        fi
    fi
done </tmp/changed_files
git diff --color HEAD > spacefmt_result
if [[ -s spacefmt_result ]]; then
    echo_headline "PLEASE APPLY CHANGES BELOW:"
    cat spacefmt_result
    exit 1
fi

if [ ${#changed_f_as_args[@]} -ne 0 ]; then
    echo_headline "Testing with exporter"
    emacs --batch -l ./core/tools/export/run.el test $(printf "%s " "${changed_f_as_args[@]}")
    if [ $? -ne 0 ]; then
        echo "Documentation needs some fixing ;)"
        exit 1
    fi
fi

echo_headline "Testing for trailing and all sorts of broken white spaces"
git reset -q "${first_commit}^"
git add -N .
git diff --check --color > space_test_result
if [[ -s space_test_result ]]; then
    cat space_test_result
    exit 1
fi
echo "No bad spaces detected"
exit 0