#!/usr/bin/env bash
set -euo pipefail

# Script directory and backups directory setup
SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
BACKUP_DIR="${SCRIPT_DIR}/backups"
mkdir -p "${BACKUP_DIR}"

# Timestamp for archive name
TIMESTAMP="$(date +"%Y%m%d_%H%M%S")"
ZIP_FILENAME="konsole_backup_${TIMESTAMP}.zip"
ZIP_FILEPATH="${BACKUP_DIR}/${ZIP_FILENAME}"

# Temporary staging directory
TEMP_DIR="$(mktemp -d)"
trap 'rm -rf "${TEMP_DIR}"' EXIT

echo "=== Starting Konsole Configuration Backup ==="

# Define target paths relative to HOME
CONFIG_PATHS=(
    ".config/konsolerc"
    ".local/share/konsole"
    ".local/share/kxmlgui5/konsole"
    ".config/konsole.notifyrc"
    ".config/konsolesshconfig"
)

COPIED_COUNT=0

for rel_path in "${CONFIG_PATHS[@]}"; do
    src_path="${HOME}/${rel_path}"
    dest_path="${TEMP_DIR}/${rel_path}"

    if [ -e "${src_path}" ]; then
        mkdir -p "$(dirname "${dest_path}")"
        cp -a "${src_path}" "${dest_path}"
        echo " [+] Staged: ~/${rel_path}"
        COPIED_COUNT=$((COPIED_COUNT + 1))
    else
        echo " [-] Skipped (not found): ~/${rel_path}"
    fi
done

if [ "${COPIED_COUNT}" -eq 0 ]; then
    echo "Error: No Konsole configuration files found to backup."
    exit 1
fi

# Create zip file from staging area
echo "Creating backup archive: ${ZIP_FILENAME}..."
(
    cd "${TEMP_DIR}"
    zip -q -r "${ZIP_FILEPATH}" .
)

echo "Backup successfully saved to: ${ZIP_FILEPATH}"

# Retention Policy: keep at most 10 recent backup zip files
MAX_BACKUPS=10

mapfile -t BACKUP_FILES < <(find "${BACKUP_DIR}" -maxdepth 1 -name "konsole_backup_*.zip" | sort -r)

TOTAL_BACKUPS="${#BACKUP_FILES[@]}"
if [ "${TOTAL_BACKUPS}" -gt "${MAX_BACKUPS}" ]; then
    echo "Cleaning up older backups (keeping top ${MAX_BACKUPS})..."
    for (( i=MAX_BACKUPS; i<TOTAL_BACKUPS; i++ )); do
        file_to_remove="${BACKUP_FILES[$i]}"
        echo " Deleting old backup: $(basename "${file_to_remove}")"
        rm -f "${file_to_remove}"
    done
fi

echo "=== Backup Complete (${TOTAL_BACKUPS} backup(s) currently stored) ==="