#!/bin/sh

set -euo pipefail

if [ "${PLUGIN_DOMAIN:-null}" = null ]; then
    echo "No gitea domain provided";
    exit 1;
fi
if [ "${PLUGIN_APIKEY:-null}" = null ]; then
    echo "No api key provided";
    exit 2;
fi
if [ "${PLUGIN_SOURCE:-null}" = null ]; then
    echo "No source branch provided, falling back to branch that triggered ci";
    exit 3;
fi
if [ "${PLUGIN_TARGET:-null}" = null ]; then
    echo "No target branch provided";
    exit 4;
fi
if [ "${PLUGIN_TITLE:-null}" = null ]; then
    PLUGIN_TITLE="$PLUGIN_SOURCE -> $PLUGIN_TARGET";
fi

RES=$(curl --request POST \
    --url "https://$PLUGIN_DOMAIN/api/v1/repos/$DRONE_REPO/pulls" \
    --header "Content-Type: application/json" \
    --header "Authorization: token $PLUGIN_APIKEY" \
    -f \
    --data "{
        \"title\": \"$PLUGIN_TITLE\",
        \"body\": \"Automatic merge of $PLUGIN_SOURCE into $PLUGIN_TARGET\",
        \"base\": \"$PLUGIN_TARGET\",
        \"head\": \"$PLUGIN_SOURCE\"
}")
echo "PR created";

if [ "${PLUGIN_MERGE:-false}" = true ]; then
    if [ "${PLUGIN_DELETE_SOURCE:-null}" = null ]; then
        echo "Falling back to not deleting source";
        PLUGIN_DELETE_SOURCE=false;
    fi
    
    ID=$(echo $RES | jq '.number')
    curl --request POST \
    --url "https://$PLUGIN_DOMAIN/api/v1/repos/$DRONE_REPO/pulls/$ID/merge" \
    --header 'Content-Type: application/json' \
    --header "Authorization: token $PLUGIN_APIKEY" \
    -f \
    --data "{
          \"do\": \"merge\",
          \"delete_branch_after_merge\": $PLUGIN_DELETE_SOURCE
    }"
    echo "PR merged";
fi