#!/bin/bash

# Load config from .env
SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
if [[ -f "$SCRIPT_DIR/.env" ]]; then
    source "$SCRIPT_DIR/.env"
else
    echo "[$(date)] Missing .env file in $SCRIPT_DIR"
    exit 1
fi

# Ensure backup directory exists
mkdir -p "$BACKUP_DIR"

# Generate timestamped filenames
TIMESTAMP=$(date +"%Y-%m-%d_%H-%M-%S")
OUTPUT_FILE="$BACKUP_DIR/backup_$TIMESTAMP.zip"
LOG_FILE="$BACKUP_DIR/backup_$TIMESTAMP.log"

# Logging helper
log() {
    echo "[$(date)] $1" | tee -a "$LOG_FILE"
}

# Uptime Kuma check-in (GET Request with only "status=up" and "msg=OK")
uptime_kuma_checkin() {
    if [[ -n "$UPTIME_KUMA_URL" && -n "$UPTIME_KUMA_API_KEY" ]]; then
        # Send GET request directly to Uptime Kuma with status=up and msg=OK
        curl -s "${UPTIME_KUMA_URL}/api/push/${UPTIME_KUMA_API_KEY}?status=up&msg=OK" > /dev/null
        log "✅ Uptime Kuma check-in sent."
    fi
}

# Gotify Error Notification
gotify_error_notify() {
    local summary="Errors detected in recent Lubelogger backup logs on $(hostname):\n$1"

    if [[ -n "$GOTIFY_PUSH_URL" && -n "$GOTIFY_PUSH_KEY" ]]; then
        # Send the Gotify notification with form data
        curl -s -X POST "${GOTIFY_PUSH_URL}/message?token=${GOTIFY_PUSH_KEY}" \
            -F "title=[${BACKUP_TAG}] Backup Errors on $(hostname)" \
            -F "message=$(echo -e "$summary" | head -c 1000)" \
            -F "priority=5" > /dev/null
        log "⚠️ Gotify error notification sent."
    fi
}


# Start backup
log "🔄 Starting Lubelogger backup job"

# Uptime Kuma Check-in: Inform that the backup process has started
uptime_kuma_checkin

response=$(curl -s -u "$USERNAME:$PASSWORD" --location "$BASE_URL/api/makebackup")

if [[ -z "$response" ]]; then
    log "❌ Error: Empty response from backup API"
    gotify_error_notify "Empty response from backup API."
    exit 1
fi

backup_url="${BASE_URL}${response//\"/}"

log "⬇️ Downloading backup from $backup_url"
curl -s -u "$USERNAME:$PASSWORD" --location "$backup_url" -o "$OUTPUT_FILE"

if [[ $? -eq 0 ]]; then
    log "✅ Backup saved to $OUTPUT_FILE"
else
    log "❌ Error: Failed to download backup"
    gotify_error_notify "Failed to download backup."
    exit 1
fi

# Cleanup old backups and logs
log "🧹 Cleaning up old backups/logs older than $RETENTION_DAYS days"
find "$BACKUP_DIR" \( -name "backup_*.zip" -o -name "backup_*.log" \) -type f -mtime +$RETENTION_DAYS -exec rm {} \;

# Error summary scanning
log "🔍 Scanning recent logs for errors"
ERRORS=""
while IFS= read -r logfile; do
    LOG_ERRORS=$(grep "Error" "$logfile")
    if [[ -n "$LOG_ERRORS" ]]; then
        ERRORS+="\n$(basename "$logfile"):\n$LOG_ERRORS\n"
    fi
done < <(find "$BACKUP_DIR" -name "backup_*.log" -type f -mtime -$RETENTION_DAYS)

if [[ -n "$ERRORS" ]]; then
    gotify_error_notify "$ERRORS"
fi

log "✅ Backup job finished"