#!/bin/sh
set -eu
dump=/dataset/dumps/neo4j.dump
test -f "$dump" || { echo 'Download the dataset first; dumps/neo4j.dump is missing.' >&2; exit 1; }
expected=$(awk '$2 == "dumps/neo4j.dump" {print $1}' /dataset/SHA256SUMS)
test -n "$expected" || { echo 'Dump checksum is missing.' >&2; exit 1; }
actual=$(sha256sum "$dump" | cut -d ' ' -f 1)
test "$actual" = "$expected" || { echo 'Dump checksum mismatch.' >&2; exit 1; }
if test -f /data/.icj-restored; then
    test "$(cat /data/.icj-restored)" = "$expected" || { echo 'This volume belongs to a different release. Use a new Compose project/volume.' >&2; exit 1; }
    echo 'Graph already restored.'
    exit 0
fi
if test -f /data/.icj-restoring; then
    test "$(cat /data/.icj-restoring)" = "$expected" || { echo 'Interrupted restore belongs to another release.' >&2; exit 1; }
else
    test ! -d /data/databases/neo4j || { echo 'Existing unrecognized database; refusing to replace it.' >&2; exit 1; }
    printf '%s\n' "$expected" > /data/.icj-restoring
fi
if test ! -f /data/.icj-loaded; then
    mkdir -p /data/.icj-stage
    printf 'server.directories.data=/data/.icj-stage\nserver.directories.transaction.logs.root=/data/.icj-stage/transactions\n' > /tmp/restore.conf
    neo4j-admin database load neo4j --from-path=/dataset/dumps --overwrite-destination=true --additional-config=/tmp/restore.conf
    touch /data/.icj-loaded
fi
mkdir -p /data/databases /data/transactions
for section in databases transactions; do
    if test -d "/data/.icj-stage/$section/neo4j"; then
        test ! -d "/data/$section/neo4j" || { echo 'Conflicting restore directories.' >&2; exit 1; }
        mv "/data/.icj-stage/$section/neo4j" "/data/$section/neo4j"
    fi
done
test -f /data/databases/neo4j/neostore
chown -R neo4j:neo4j /data
mv /data/.icj-restoring /data/.icj-restored
echo 'Graph restored and checksum verified.'