#!/bin/bash
set -e

#-----------------------------------------------------------------------------------------------
# --------------------------- Core Rsync Script for Unraid -------------------------------------
#-----------------------------------------------------------------------------------------------

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

# Load config
load_master_conf

# Detect hosts / SSH / Tailscale
detect_remote

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

# Parse CLI args
parse_args "$@"

#----------------------------------------------------------
# Profile Detection (FIXED)
#----------------------------------------------------------
DIR_CLEAN="${DIRECTORY%/}"
PROFILE_NAME=$(basename "$DIR_CLEAN" | tr '[:upper:]' '[:lower:]')

echo "Detected profile: $PROFILE_NAME"

# Debug (remove later if you want)
echo "DEBUG: DIRECTORY=$DIRECTORY"
echo "DEBUG: DIR_CLEAN=$DIR_CLEAN"
echo "DEBUG: PROFILE_NAME=$PROFILE_NAME"
echo "DEBUG: Available profiles: ${!PROFILE_MAX_PROCS[@]}"

#----------------------------------------------------------
# Apply profile overrides (SAFE)
#----------------------------------------------------------

# Scalars (safe fallback)
MAX_RSYNC_PROCS=${PROFILE_MAX_PROCS[$PROFILE_NAME]:-$MAX_RSYNC_PROCS}
BW_LIMIT=${PROFILE_BW_LIMIT[$PROFILE_NAME]:-$BW_LIMIT}
CONTAINER_DELAY=${PROFILE_CONTAINER_DELAY[$PROFILE_NAME]:-$CONTAINER_DELAY}
RETRY_COUNT=${PROFILE_RETRY_COUNT[$PROFILE_NAME]:-$RETRY_COUNT}
SLEEP=${PROFILE_SLEEP[$PROFILE_NAME]:-$SLEEP}

# Arrays (ONLY override if profile exists)
if [[ -n "${PROFILE_CRITICAL_CONTAINER_NAMES[$PROFILE_NAME]}" ]]; then
    IFS=' ' read -r -a CRITICAL_CONTAINER_NAMES <<< "${PROFILE_CRITICAL_CONTAINER_NAMES[$PROFILE_NAME]}"
fi

if [[ -n "${PROFILE_DELAYED_CONTAINERS[$PROFILE_NAME]}" ]]; then
    IFS=' ' read -r -a DELAYED_CONTAINERS <<< "${PROFILE_DELAYED_CONTAINERS[$PROFILE_NAME]}"
fi

if [[ -n "${PROFILE_EXCLUDE_DIRS[$PROFILE_NAME]}" ]]; then
    IFS=' ' read -r -a EXCLUDE_DIRS <<< "${PROFILE_EXCLUDE_DIRS[$PROFILE_NAME]}"
fi

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

#----------------------------------------------------------
# Dependency check
#----------------------------------------------------------
for cmd in rsync ssh ping timeout docker tailscale; do
    command -v "$cmd" >/dev/null 2>&1 || {
        echo "Error: Required command '$cmd' is not installed."
        exit 1
    }
done

trap 'echo "Script interrupted. Exiting."; exit 130' INT TERM

#----------------------------------------------------------
# Helper Functions
#----------------------------------------------------------

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
            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
}

check_server_online() {
    timeout 5 ping -c 1 "$REMOTE_SERVER" &>/dev/null
}

declare -a RUNNING_CONTAINERS=()

stop_containers() {
    echo "[$LOCAL_SERVER_NAME] Checking containers on ${REMOTE_SERVER_NAME}..."
    RUNNING_CONTAINERS=()

    for container in "${CRITICAL_CONTAINER_NAMES[@]}"; do
        [ -z "$container" ] && continue

        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")

            if [[ "$DRY_RUN" == true ]]; then
                echo "[DRY-RUN] Would stop container $container"
            else
                ssh -i "$SSH_KEY" root@"$REMOTE_SERVER" "docker stop $container"
            fi
        fi
    done
}

start_containers() {
    echo "[$LOCAL_SERVER_NAME] Restarting containers on ${REMOTE_SERVER_NAME}..."

    for container in "${RUNNING_CONTAINERS[@]}"; do
        if [[ " ${DELAYED_CONTAINERS[*]} " == *" $container "* ]]; then
            echo "Delaying start of $container by ${CONTAINER_DELAY}s..."
            [[ "$DRY_RUN" == false ]] && sleep "$CONTAINER_DELAY"
        fi

        if [[ "$DRY_RUN" == true ]]; then
            echo "[DRY-RUN] Would start container $container"
        else
            ssh -i "$SSH_KEY" root@"$REMOTE_SERVER" "docker start $container"
        fi
    done
}

#----------------------------------------------------------
# Main
#----------------------------------------------------------

main() {
    echo "[$LOCAL_SERVER_NAME] Syncing $DIRECTORY → $REMOTE_SERVER:$DIRECTORY"

    for i in $(seq 1 "$RETRY_COUNT"); do
        if check_server_online; then break; fi
        echo "Remote $REMOTE_SERVER_NAME down, retrying in $SLEEP seconds..."
        sleep "$SLEEP"
    done

    check_server_online || {
        echo "Remote $REMOTE_SERVER_NAME unreachable. Exiting."
        exit 1
    }

    wait_for_rsync
    stop_containers

    RSYNC_OPTS=(
        -av
        --info=progress2
        --human-readable
        --bwlimit="$BW_LIMIT"
        --delete
        --inplace
        --no-whole-file
    )

    for pattern in "${EXCLUDE_DIRS[@]}"; do
        [[ -n "$pattern" ]] && 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."

            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
    echo "[$LOCAL_SERVER_NAME] Sync complete."
}

main