#!/bin/bash
set -x

# ==========================================================
# CONFIGURATION
# ==========================================================
CONTAINER_NAME="MySQL"
DB_USER="root"
DB_PASS="Vlado9674+"

UNRAID_NAME="tower"
BASE_PATH="/mnt/user/MySQLBackup"

KEEP_DAYS=3

# Databases to back up
WHAT_TO_BACKUP=("fio" "torrents" "OrdinaceDropBoxBackup" "medevio" "kanboard" "medicus" "studie" "puzzle")

# ==========================================================
# START
# ==========================================================
echo "Starting scheduled backup for: ${WHAT_TO_BACKUP[*]}"
START_TS=$(date '+%Y-%m-%d %H:%M:%S')

for DB_NAME in "${WHAT_TO_BACKUP[@]}"; do
    echo "------------------------------------------"
    echo "Processing database: $DB_NAME"

    DATE=$(date +%Y-%m-%d_%H%M)
    FINAL_PATH="$BASE_PATH/$UNRAID_NAME/$DB_NAME/$DATE"
    mkdir -p "$FINAL_PATH"

    DUMP_FILE="$FINAL_PATH/$DB_NAME.sql.gz"
    ERR_FILE="$FINAL_PATH/$DB_NAME.err"

    # ======================================================
    # DUMP + GZIP
    # ======================================================
    docker exec "$CONTAINER_NAME" mysqldump \
        -u"$DB_USER" \
        -p"$DB_PASS" \
        --databases "$DB_NAME" \
        --single-transaction \
        --quick \
        --routines \
        --triggers \
        --events \
        --set-gtid-purged=OFF \
        --default-character-set=utf8mb4 \
        --max_allowed_packet=512M \
        2> "$ERR_FILE" \
        | gzip -1 > "$DUMP_FILE"

    EXIT_CODE=${PIPESTATUS[0]}

    # ======================================================
    # VALIDATION
    # ======================================================
    if [ $EXIT_CODE -eq 0 ] && [ -s "$DUMP_FILE" ] && [ ! -s "$ERR_FILE" ]; then
        echo "SUCCESS: $DB_NAME backed up successfully"
        echo "Dump size: $(du -h "$DUMP_FILE" | cut -f1)"
        rm -f "$ERR_FILE"
    else
        echo "ERROR: Backup failed for database: $DB_NAME"
        echo "Exit code: $EXIT_CODE"
        echo "Dump file:"
        ls -lh "$DUMP_FILE" 2>/dev/null || echo "  (not created)"
        echo "Error output:"
        [ -s "$ERR_FILE" ] && cat "$ERR_FILE" || echo "  (no stderr output)"
    fi

    # ======================================================
    # CLEANUP OLD BACKUPS
    # ======================================================
    echo "Cleaning up old backups for $DB_NAME..."
    find "$BASE_PATH/$UNRAID_NAME/$DB_NAME" \
        -mindepth 1 -maxdepth 1 -type d -mtime +$KEEP_DAYS \
        -exec rm -rf {} \;

done

echo "------------------------------------------"
echo "All backup tasks completed at $(date)"
echo "Started at: $START_TS"
set +x