#!/usr/bin/env bash

set -u

echo
echo "=============================================="
echo " Docker APT Repo HTTPS -> HTTP LXC Converter"
echo "=============================================="
echo

for CTID in $(pct list | awk 'NR>1 {print $1}'); do

    STATUS=$(pct status "$CTID" 2>/dev/null | awk '{print $2}')
    NAME=$(pct config "$CTID" 2>/dev/null | awk -F': ' '/^hostname:/ {print $2}')

    echo "----------------------------------------------"
    echo "Container: $CTID${NAME:+ ($NAME)}"
    echo "Status:    $STATUS"

    if [[ "$STATUS" != "running" ]]; then
        echo "SKIP: Container is not running."
        continue
    fi

    OS_ID=$(pct exec "$CTID" -- sh -c \
        '. /etc/os-release 2>/dev/null && echo "$ID"' \
        2>/dev/null || true)

    if [[ "$OS_ID" != "debian" ]]; then
        echo "SKIP: Not Debian."
        continue
    fi

    MATCHES=$(pct exec "$CTID" -- sh -c '
        grep -RIl \
            "https://download\.docker\.com" \
            /etc/apt/sources.list \
            /etc/apt/sources.list.d \
            2>/dev/null || true
    ')

    if [[ -z "$MATCHES" ]]; then
        echo "OK: No HTTPS Docker APT repo found."
        continue
    fi

    echo "Found Docker repo in:"

    while IFS= read -r FILE; do
        [[ -z "$FILE" ]] && continue

        echo "  $FILE"

        TIMESTAMP=$(date +%Y%m%d-%H%M%S)
        BASENAME=$(basename "$FILE")
        BACKUP_DIR="/root/apt-backups/docker"
        BACKUP="${BACKUP_DIR}/${BASENAME}.${TIMESTAMP}.bak"

        pct exec "$CTID" -- sh -c "
            mkdir -p '$BACKUP_DIR' &&
            cp '$FILE' '$BACKUP' &&
            sed -i \
                's|https://download\.docker\.com|http://download.docker.com|g' \
                '$FILE'
        "

        if [[ $? -eq 0 ]]; then
            echo "  CHANGED: https -> http"
            echo "  Backup:  $BACKUP"
        else
            echo "  ERROR: Failed to modify $FILE"
        fi

    done <<< "$MATCHES"

    echo
    echo "Current Docker repo entries:"

    pct exec "$CTID" -- sh -c '
        grep -RHn \
            "download\.docker\.com" \
            /etc/apt/sources.list \
            /etc/apt/sources.list.d \
            2>/dev/null || true
    '

    echo
done

echo "=============================================="
echo " Finished"
echo "=============================================="