#!/bin/bash

set -e
set -o pipefail

source "$STATE"

site_changes() {
    curl -s https://api.github.com/repos/weaveworks/weave/pulls/$1/files |
        jq -r '.[]|.status + " " + .filename' |
        grep -oP '^(added|modified|removed) site/.*(?=\.md$)'
}

format_comment() {
    if [ ! -d .git ] || ! BRANCH=$(git symbolic-ref --short HEAD) || [ -z "$BRANCH" ] ; then
        echo "Could not determine branch" >&2
        return 1
    fi

    echo "#### Documentation changes:"
    while read ACTION PAGE; do
        echo "$ACTION [${PAGE#site/}]($WP_DEV_URL/docs/net/${BRANCH#issues/}/${PAGE#site/}/)"
    done | sort
}

post_comment() {
    jq -s -R '. | tostring | { body: . }' |
        curl -s -d @- \
            -H "Authorization: Bearer $WP_GH_COMMENT_TOKEN" \
            -H 'Content-Type: application/json' \
            https://api.github.com/repos/weaveworks/weave/issues/$GH_PR/comments > /dev/null
}

cd $SRCDIR
bin/install-wordepress v1.0.0
bin/publish-site "$WP_DEV_URL" "$WP_DEV_USER" "$WP_DEV_PASSWORD"

if [ -n "$WP_GH_COMMENT_TOKEN" -a -n "$GH_PR" ] ; then
    echo ">>> Adding doc changelog to GitHub PR $GH_PR"
    if CHANGES=$(site_changes $GH_PR) && [ -n "$CHANGES" ] ; then
        echo "$CHANGES" | format_comment | post_comment
    fi
fi