#!/bin/bash
set -e

SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
source "$SCRIPT_DIR/../common.sh"

# Load config
load_master_conf

# Input directory
DIRECTORY="$1"
if [[ -z "$DIRECTORY" ]]; then
    echo "Usage: $0 <directory-to-sync> [--dry-run|-n] [VAR=value ...]"
    exit 1
fi
shift
parse_args "$@"

# Detect hosts & SSH key
detect_hosts

# Determine profile
DIR_CLEAN="${DIRECTORY%/}"
PROFILE_NAME=$(basename "$DIR_CLEAN" | tr '[:upper:]' '[:lower:]')
echo "Detected profile: $PROFILE_NAME"

# Apply profile defaults
MAX_RSYNC_PROCS=${PROFILE_MAX_PROCS[$PROFILE_NAME]:-$MAX_RSYNC_PROCS}
BW_LIMIT=${PROFILE_BW_LIMIT[$PROFILE_NAME]:-$BW_LIMIT}
CRITICAL_CONTAINER_NAMES=(${PROFILE_CRITICAL_CONTAINER_NAMES[$PROFILE_NAME]})
DELAYED_CONTAINERS=(${PROFILE_DELAYED_CONTAINERS[$PROFILE_NAME]})
CONTAINER_DELAY=${PROFILE_CONTAINER_DELAY[$PROFILE_NAME]:-$CONTAINER_DELAY}
RETRY_COUNT=${PROFILE_RETRY_COUNT[$PROFILE_NAME]:-$RETRY_COUNT}
SLEEP=${PROFILE_SLEEP[$PROFILE_NAME]:-$SLEEP}
EXCLUDE_DIRS=(${PROFILE_EXCLUDE_DIRS[$PROFILE_NAME]:-${EXCLUDE_DIRS[@]}})

# Validate
validate_int MAX_RSYNC_PROCS "$MAX_RSYNC_PROCS"
validate_int BW_LIMIT "$BW_LIMIT"
validate_int CONTAINER_DELAY "$CONTAINER_DELAY"
validate_int RETRY_COUNT "$RETRY_COUNT"
validate_int SLEEP "$SLEEP"

echo "Settings: MAX_RSYNC_PROCS=$MAX_RSYNC_PROCS, BW_LIMIT=$BW_LIMIT, CONTAINERS=${CRITICAL_CONTAINER_NAMES[*]}, EXCLUDES=${EXCLUDE_DIRS[*]}"

# Main rsync function
main() {
    echo "[$LOCAL_SERVER_NAME] Syncing $DIRECTORY → $REMOTE_SERVER:$DIRECTORY"

    # Retry server ping
    for i in $(seq 1 "$RETRY_COUNT"); do
        if timeout 5 ping -c1 "$REMOTE_SERVER" &>/dev/null; then break; fi
        echo "Remote $REMOTE_SERVER_NAME down, retrying in $SLEEP seconds..."
        sleep "$SLEEP"
    done
    timeout 5 ping -c1 "$REMOTE_SERVER" &>/dev/null || { echo "Remote $REMOTE_SERVER_NAME unreachable"; exit 1; }

    # Stop critical containers
    RUNNING_CONTAINERS=()
    for container in "${CRITICAL_CONTAINER_NAMES[@]}"; do
        STATUS=$(ssh -i "$SSH_KEY" root@"$REMOTE_SERVER" "docker inspect -f '{{.State.Running}}' $container" 2>/dev/null || echo "false")
        if [[ "$STATUS" == "true" ]]; then
            echo "Stopping $container"
            RUNNING_CONTAINERS+=("$container")
            [ "$DRY_RUN" = false ] && ssh -i "$SSH_KEY" root@"$REMOTE_SERVER" "docker stop $container"
        fi
    done

    # Rsync
    RSYNC_OPTS=(-av --info=progress2 --human-readable --bwlimit="$BW_LIMIT" --delete --inplace --no-whole-file)
    for pattern in "${EXCLUDE_DIRS[@]}"; do
        RSYNC_OPTS+=(--exclude="$pattern")
    done
    [ "$DRY_RUN" = true ] && RSYNC_OPTS+=("--dry-run")

    for attempt in $(seq 1 "$RETRY_COUNT"); do
        echo "Starting rsync attempt $attempt/$RETRY_COUNT..."
        if rsync "${RSYNC_OPTS[@]}" -e "ssh -i \"$SSH_KEY\" -T -o Compression=no -o IPQoS=throughput" "$DIRECTORY" "root@${REMOTE_SERVER}:$DIRECTORY"; then
            echo "Rsync completed successfully."
            break
        else
            echo "Rsync attempt $attempt failed."
            [ "$attempt" -lt "$RETRY_COUNT" ] && sleep "$SLEEP" || { echo "All attempts failed"; exit 1; }
        fi
    done

    # Restart containers
    for container in "${RUNNING_CONTAINERS[@]}"; do
        if [[ " ${DELAYED_CONTAINERS[*]} " == *" $container "* ]]; then
            [ "$DRY_RUN" = false ] && sleep "$CONTAINER_DELAY"
        fi
        [ "$DRY_RUN" = false ] && ssh -i "$SSH_KEY" root@"$REMOTE_SERVER" "docker start $container"
    done

    echo "[$LOCAL_SERVER_NAME] Sync complete."
}

main