#!/usr/bin/env bash


# Disallow pull requests to `fireice-uk/xmr-stak` branch `master`
#
# - merging from `dev` or `release-...` located within our reposetory is allowed
# - merging to `master` within a fork is allowed
# - pull request to `dev` are allowed from everywhere
#
# See: https://docs.travis-ci.com/user/environment-variables/
#      https://developer.github.com/v3/pulls/#get-a-single-pull-request
#
#
# return 0 = OK, else false
#

if [ "$TRAVIS" != "true" ] ; then
    echo "Not in travis, so I have nothing to do :)"
else
    xmrstak_slug="fireice-uk/xmr-stak"

    # check only pull requests to `master`
    if [ "$TRAVIS_EVENT_TYPE" == "pull_request" ] && [ "$TRAVIS_BRANCH" == "master" ] ; then
        # allow pull requests to forks
        if [ "$TRAVIS_REPO_SLUG" == "$xmrstak_slug" ] ; then
            echo "$TRAVIS_PULL_REQUEST_BRANCH" | grep -q "^dev$"
            comingFromDev=$?
            echo "$TRAVIS_PULL_REQUEST_BRANCH" | grep -q "^release-"
            comingFromRelease=$?
            # check origin
            if [[ "$TRAVIS_PULL_REQUEST_SLUG" != "$xmrstak_slug" || ( $comingFromDev -ne 0 && $comingFromRelease -ne 0 ) ]] ; then
                # the PR came from a fork owned by the first part of the slug
                pr_author=$(echo "$TRAVIS_PULL_REQUEST_SLUG" | awk -F "/" '{print $1}')
                pr_branch=$TRAVIS_PULL_REQUEST_BRANCH
                echo ""
                echo "Pull request opened to wrong branch!"
                echo ""
                echo "Pul requests need to go to our 'dev' branch but your pull-request from '"$TRAVIS_PULL_REQUEST_SLUG"' was"
                echo "sent to 'master' which is only updated by our maintainers for new stable releases."
                echo ""
                echo "Please re-open your pull-request against our 'dev' branch:"
                echo "  https://github.com/fireice-uk/xmr-stak/compare/dev...$pr_author:$pr_branch?expand=1"
                echo ""
                echo "For further information, please see:"
                echo "  https://github.com/fireice-uk/xmr-stak/blob/dev/CONTRIBUTING.md"
                exit 1
            fi
        fi
    fi
fi