#!/usr/bin/env bash

# mysqldump.sh - create SQL dump of MariaDB/MySQL database.
# Copyright (c) 2022 ge <https://nixhacks.net/>
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program.  If not, see <https://www.gnu.org/licenses/>.

handler::mysqldump() {
    # Create SQL-dump at location __main_target_path using mysqldump(1)
    # Compression is optional.
    # Handle 'mysql' URI scheme.
    #
    # Usage: handler::mysqldump URI

    log "Run handler handler::mysqldump()"

    local uri
    local dst_path
    local compr_util
    local compr_cmd
    local file_ext

    uri="$1"
    # shellcheck disable=SC2154
    dst_path="$__main_target_path"

    parse_uri "$uri"

    [ -z "$port" ] && port=3306  # Set default MySQL port.

    # shellcheck disable=SC2154
    [ -n "$__verbose" ] && echo "Dumping database '${path##*/}'"\
        "owned by ${username}@${hostname} ..." | log -p

    # Select compression utility and set filename extension.
    if [ -n "$compression" ]; then
        set_compression "$compression"
        file_ext=".sql${file_ext}"
    else
        compr_util=
        file_ext='.sql'
    fi

    dump_name="${dst_path}/$(gen_backup_name "$file_ext")"

    [ -n "$__verbose" ] && echo "Dump: $dump_name"
    log "Dump: $dump_name"

    if [ -n "$compr_util" ]; then
        compr_cmd="$compr_util -c"  # e.g. gzip -c
    else
        compr_cmd="cat"
    fi

    mysqldump_opts="${mysqldump_opts:-}"

    # NOTE! mysqldump_opts and compr_cmd variables must be unquoted!
    # shellcheck disable=SC2086,SC2154
    try mysqldump $mysqldump_opts \
        --host="$hostname" \
        --port="$port" \
        "${path##*/}" \
        --user="$username" \
        --password="$password" |
        $compr_cmd > "$dump_name"

    if [ ! -s "$dump_name" ]; then
        err -e "Something went wrong: Dump size is 0 bytes. Removing $dump_name"
        rm "$dump_name"
    fi
}

# POSTGRESQL
#bk_dump_postgresql() {
#    # Do PostgreSQL dump.
#
#    bk_log "Dumping database '${path##*/}' owned by ${user}@${host} (PostgreSQL) ..."
#
#    dump_name="$entry_local"/"$(bk_get_name "$db_name" .psql.gz)"
#    [ "$port" ] || port=5432  # Set default PostgreSQL port.
#    export PGPASSWORD="$password"
#
#    pg_dump \
#        --host="$host" \
#        --port="$port" \
#        --dbname="${path##*/}" \
#        --username="$user" \
#        --no-password | gzip -c > "$dump_name" |& bk_log
#
#    unset PGPASSWORD
#
#    if [ -s "$dump_name" ]; then
#        bk_log "Dumping database '${path##*/}' owned by ${user}@${host} (PostgreSQL) [Done]"
#        bk_log "Dump saved as: $dump_name"
#        bk_upload_file "$dump_name"
#
#    else
#        rm "$dump_name"
#        bk_err "Something went wrong. Dump size is 0 bytes. Removing $dump_name"
#    fi
#}