#!/bin/bash
set -e

#-----------------------------------------------------------------------------------------------
# --------------------------- Core Rsync Script for Unraid -------------------------------------
#-----------------------------------------------------------------------------------------------
#----------------- User Variables, Please adjust in Master.conf as needed ----------------------
#-----------------------------------------------------------------------------------------------
#
# User variables can be adjusted in Master.conf
#
# Scripts now just contain runtime logic
#
# This new setup allows for profiles and arguments 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
#-----------------------------------------------------------------------------------------------
#---------------End Of User Variables, Please adjust in Master.conf as needed ------------------
#-----------------------------------------------------------------------------------------------

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

# Load config
load_master_conf

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

shift 1

# Parse args AFTER shifting
parse_args "$@"

# Detect hosts AFTER config + args
detect_hosts

# Determine profile
PROFILE_NAME=$(basename "$DIRECTORY" | 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[@]}})

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

#============================================================
# 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
}

stop_containers() {
    echo "[$LOCAL_SERVER_NAME] Checking containers on ${REMOTE_SERVER_NAME}..."
    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")
            [[ "$DRY_RUN" = true ]] || ssh -i "$SSH_KEY" root@"$REMOTE_SERVER" "docker stop $container"
        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 ${CONTAINER_DELAY}s..."
            sleep "$CONTAINER_DELAY"
        fi

        [[ "$DRY_RUN" = true ]] || ssh -i "$SSH_KEY" root@"$REMOTE_SERVER" "docker start $container"
    done
}

#============================================================
# Main Logic
#============================================================

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 "${EXCLUDE_DIRS[@]}"; do
        RSYNC_OPTS+=(--exclude="$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