#!/bin/bash

# Install a daily cron job to restart the docker-compose stack.
# Non-interactive; idempotent update of user's crontab.
# Usage:
#   INTERVAL="15 3 * * *" ./install_daily_restart_cron.sh
# Defaults to 03:15 daily if INTERVAL not provided.

set -euo pipefail

REPO_DIR="$(cd "$(dirname "$0")" && pwd)"
SCRIPT_PATH="$REPO_DIR/restart_containers.sh"
INTERVAL_CRON=${INTERVAL:-"15 3 * * *"}

if [ ! -x "$SCRIPT_PATH" ]; then
  echo "Making restart_containers.sh executable"
  chmod +x "$SCRIPT_PATH"
fi

if ! command -v crontab >/dev/null 2>&1; then
  echo "Error: crontab not found on this system."
  exit 1
fi

# Prefer docker compose; fallback to docker-compose is handled inside the script

# Compose file to use (default docker-compose.yml). Override via COMPOSE_FILE env
COMPOSE_FILE_PATH=${COMPOSE_FILE:-docker-compose.yml}

LOG_FILE="$REPO_DIR/logs/cron_restart.log"
mkdir -p "$(dirname "$LOG_FILE")"

# Build the cron line; ensure PATH for docker is available
CRON_LINE="$INTERVAL_CRON PATH=/usr/local/bin:/usr/bin:/bin /bin/bash -lc 'COMPOSE_FILE=$COMPOSE_FILE_PATH "$SCRIPT_PATH" >> "$LOG_FILE" 2>&1'"

# Install or update crontab entry
EXISTING_CRON="$(mktemp)"
trap 'rm -f "$EXISTING_CRON"' EXIT

crontab -l > "$EXISTING_CRON" 2>/dev/null || true

# Remove any previous lines referencing restart_containers.sh
grep -v "$SCRIPT_PATH" "$EXISTING_CRON" > "$EXISTING_CRON.cleaned" || true
mv "$EXISTING_CRON.cleaned" "$EXISTING_CRON"

echo "$CRON_LINE" >> "$EXISTING_CRON"
crontab "$EXISTING_CRON"

echo "Installed cron entry: $CRON_LINE"
echo "Logs will be written to: $LOG_FILE"