#!/usr/bin/env bash
set -euo pipefail
IFS=$'\n\t'
# Inspiration of script from: https://borgbackup.readthedocs.io/en/stable/quickstart.html#automating-backups

logInfo() { printf '%(%Y-%m-%d %H:%m:%S)T [INFO]: %s\n' -1 "$*" >&2; }

configurationFileLocation=$1

workDirPath=/root/backup_work_dir
logInfo "Creating working directory at: $workDirPath..."
mkdir -p "$workDirPath"

cleanup() {
    logInfo "Backup interrupted"
    # rm -f "$workDirPath" # TODO: Enable
    exit 2
}
trap 'cleanup' INT TERM

# region: ---------------------------------- DBBACKUPS ----------------------------------
createDatabaseBackup() {
    host=$1
    dbname=$2
    username=$3
    password=$4
    targetFolderPath=$5

    logInfo "Dumping database: $dbname to $targetFolderPath..."

    # Getting the correct version tools installed on the host proofed to be a very frustrating experience.
    # So instead we'll do the dumping on the container.
    postgresContainerName='postgres-postgres-1'
    containerDumpPath=/dump.sql

    logInfo "Dumping database $dbname on container: $postgresContainerName..."
    docker exec "$postgresContainerName" bash -c "(export PGPASSWORD='$password'; pg_dump $dbname \
        --file $containerDumpPath \
        --host $host \
        --username $username)"

    logInfo "Extracting the archive from the container..."
    docker cp "$postgresContainerName:$containerDumpPath" "$targetFolderPath/$dbname.sql" 2>/dev/null

    logInfo "Removing the file from the docker container..."
    docker exec "$postgresContainerName" rm "$containerDumpPath"
}

createAllDatabaseBackups() {
    nrOfConfigurations="$(yq '.database_backups | length' <"$configurationFileLocation")"
    logInfo "Backing up from $nrOfConfigurations database configurations..."

    postgresBackupDirectory="$workDirPath/postgres"
    mkdir -p "$postgresBackupDirectory"

    for ((i = 0 ; i < "$nrOfConfigurations" ; i++)); do
        dbConfiguration="$(yq ".database_backups[$i]" <"$configurationFileLocation")"
        host="$(echo "$dbConfiguration" | jq -r '.host')"
        dbname="$(echo "$dbConfiguration" | jq -r '.dbname')"
        username="$(echo "$dbConfiguration" | jq -r '.username')"
        password="$(echo "$dbConfiguration" | jq -r '.password')"
        targetFolderPath="$postgresBackupDirectory"

        createDatabaseBackup "$host" "$dbname" "$username" "$password" "$targetFolderPath"
    done
}
# endregion: ------------------------------- DBBACKUPS ----------------------------------

createAllDatabaseBackups