#!/bin/bash
set -e

#-----------------------------------------------------------------------------------------------
#----------------- User Variables, Please adjust here in Master.conf as needed -----------------
#-----------------------------------------------------------------------------------------------
## This is the main Core Rsync script
#
# User variables can be adjusted in Master.conf
# Scripts now just contain runtime logic
#
# This allows for profiles and multiple things to use the core script
# Use arguments in unRAID User Plugin for directory
# Example: /mnt/user/appdata/unraid_scripts/Rsync/rsync.sh /mnt/user/appdata-test/Arrs/
#
# /mnt/user/appdata-test/Arrs/ is the argument
# If the last name /Arrs/ matches a profile in Master.conf, then profile defaults are used
# Otherwise, global configuration in Master.conf is used
#-----------------------------------------------------------------------------------------------
#----------------- User Variables, Please adjust here in Master.conf as needed -----------------
#-----------------------------------------------------------------------------------------------

SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
# Load configs & helpers
source "$SCRIPT_DIR/../Master.conf"
source "$SCRIPT_DIR/../common.sh"

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

# ----------------------------- Profile -----------------------------
PROFILE_NAME=$(basename "$DIRECTORY" | tr '[:upper:]' '[:lower:]')

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[@]}})

[[ "$ENABLE_LOGGING" == true ]] && echo "Detected profile: $PROFILE_NAME"
[[ "$ENABLE_LOGGING" == true ]] && echo "Settings: MAX_RSYNC_PROCS=$MAX_RSYNC_PROCS, BW_LIMIT=$BW_LIMIT, CONTAINERS=${CRITICAL_CONTAINER_NAMES[*]}, EXCLUDES=${EXCLUDE_DIRS[*]}"

# ----------------------------- Main Sync -----------------------------
wait_for_rsync() {
    for attempt in $(seq 1 "$RETRY_COUNT"); do
        RSYNC_COUNT=$(pgrep -fc "rsync.*root@${REMOTE_SERVER}" || true)
        if [ "$RSYNC_COUNT" -ge "$MAX_RSYNC_PROCS" ]; then
            [[ "$ENABLE_LOGGING" == true ]] && echo "[$LOCAL_SERVER_NAME] Waiting... ($RSYNC_COUNT active rsync processes)"
            sleep "$SLEEP"
        else
            return 0
        fi
    done
    echo "Too many rsync processes, exiting."
    exit 1
}

main() {
    [[ "$ENABLE_LOGGING" == true ]] && echo "[$LOCAL_SERVER_NAME] Syncing $DIRECTORY → $REMOTE_SERVER:$DIRECTORY"

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

    wait_for_rsync
    stop_containers
    get_rsync_opts

    for ex in "${EXCLUDE_DIRS[@]}"; do RSYNC_OPTS+=(--exclude="$ex"); 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 $attempt failed."
            if [ "$attempt" -lt "$RETRY_COUNT" ]; then
                echo "Retrying in $SLEEP seconds..."
                sleep "$SLEEP"
            else
                echo "All $RETRY_COUNT rsync attempts failed."
                start_containers
                exit 1
            fi
        fi
    done

    start_containers
    [[ "$ENABLE_LOGGING" == true ]] && echo "[$LOCAL_SERVER_NAME] Sync complete."
}

main