#!/bin/bash
# -----------------------------------------------------------------------------------------------
# ----------------- UNRAID OPS COMMON LIBRARY (FINAL STABLE FRAMEWORK v1) -----------------------
# -----------------------------------------------------------------------------------------------

# ----------------------------- ICONS -----------------------------

ICON_INFO="ℹ️"
ICON_WARN="⚠️"
ICON_ERROR="❌"
ICON_SUCCESS="✅"
ICON_RUN="🚀"
ICON_STOP="🛑"
ICON_RETRY="🔁"
ICON_SYNC="🔄"
ICON_GEAR="⚙️"

# ----------------------------- OUTPUT -----------------------------

info() { echo "$ICON_INFO [INFO] $*"; }
warn() { echo "$ICON_WARN [WARN] $*"; }
error() { echo "$ICON_ERROR [ERROR] $*"; }
success() { echo "$ICON_SUCCESS [OK] $*"; }

log() {
    [[ "${ENABLE_LOGGING:-false}" == true ]] && echo "[LOG] $*"
}

# ----------------------------- ARG PARSER -----------------------------

parse_args() {
    ENABLE_LOGGING=${ENABLE_LOGGING:-false}
    DRY_RUN=${DRY_RUN:-false}
    SHOW_STATUS=${SHOW_STATUS:-false}

    CLEAN_ARGS=()

    for ARG in "$@"; do
        if [[ "$ARG" == *=* ]]; then
            VAR="${ARG%%=*}"
            VAL="${ARG#*=}"

            case "$VAR" in
                LOG)
                    [[ "$VAL" == "true" ]] && ENABLE_LOGGING=true
                    [[ "$VAL" == "false" ]] && ENABLE_LOGGING=false
                    ;;
                *)
                    if declare -p "$VAR" &>/dev/null; then
                        printf -v "$VAR" '%s' "$VAL"
                        log "Set $VAR=$VAL"
                    else
                        warn "Unknown variable: $VAR"
                    fi
                    ;;
            esac
        else
            case "$ARG" in
                --dry-run|-n) DRY_RUN=true ;;
                --log) ENABLE_LOGGING=true ;;
                --no-log) ENABLE_LOGGING=false ;;
                --status|--summary) SHOW_STATUS=true ;;
                --help|-h)
                    echo "Usage: script <dir> [--dry-run] [--log]"
                    exit 0
                    ;;
                *) CLEAN_ARGS+=("$ARG") ;;
            esac
        fi
    done

    PARSED_ARGS=("${CLEAN_ARGS[@]}")
}

# ----------------------------- VALIDATION -----------------------------

require_var() {
    [[ -z "${!1:-}" ]] && error "Missing required: $1" && exit 1
}

# ----------------------------- HOST DETECTION -----------------------------

detect_hosts() {
    LOCAL_HOSTNAME="$(hostname)"

    if [[ "$LOCAL_HOSTNAME" == "$HOST1" ]]; then
        LOCAL_SERVER_NAME="$HOST1"
        REMOTE_SERVER_NAME="$HOST2"
    elif [[ "$LOCAL_HOSTNAME" == "$HOST2" ]]; then
        LOCAL_SERVER_NAME="$HOST2"
        REMOTE_SERVER_NAME="$HOST1"
    else
        error "Unknown host: $LOCAL_HOSTNAME"
        exit 1
    fi

    declare -A SSH_KEYS
    SSH_KEYS["$HOST1|$HOST2"]="$HOST1_SSH_KEY"
    SSH_KEYS["$HOST2|$HOST1"]="$HOST2_SSH_KEY"

    SSH_KEY="${SSH_KEYS[$LOCAL_SERVER_NAME|$REMOTE_SERVER_NAME]}"

    [[ -z "$SSH_KEY" ]] && error "Missing SSH key mapping" && exit 1

    info "Host: $LOCAL_SERVER_NAME → $REMOTE_SERVER_NAME"
}

# ----------------------------- REMOTE -----------------------------

resolve_remote_ip() {
    log "Resolving remote IP..."
    REMOTE_SERVER=$(tailscale ip -4 "$REMOTE_SERVER_NAME" 2>/dev/null)

    [[ -z "$REMOTE_SERVER" ]] && error "Failed to resolve remote IP" && exit 1

    info "Remote IP: $REMOTE_SERVER"
}

# ----------------------------- CONTAINERS -----------------------------

RUNNING_CONTAINERS=()

stop_containers() {

    if [[ ${#CRITICAL_CONTAINER_NAMES[@]} -eq 0 ]]; then
        log "No containers defined to stop"
        return
    fi

    info "Stopping containers..."
    RUNNING_CONTAINERS=()

    for c in "${CRITICAL_CONTAINER_NAMES[@]}"; do

        log "Checking container: $c"

        STATUS=$(ssh -i "$SSH_KEY" root@"$REMOTE_SERVER" \
            "docker inspect -f '{{.State.Running}}' $c 2>/dev/null" || echo "false")

        if [[ "$STATUS" == "true" ]]; then
            warn "Stopping $c"
            RUNNING_CONTAINERS+=("$c")
            ssh -i "$SSH_KEY" root@"$REMOTE_SERVER" "docker stop $c"
        else
            log "$c already stopped"
        fi
    done
}

start_containers() {

    if [[ ${#RUNNING_CONTAINERS[@]} -eq 0 ]]; then
        log "No containers to restart"
        return
    fi

    info "Starting containers..."

    for c in "${RUNNING_CONTAINERS[@]}"; do
        info "Starting $c"
        ssh -i "$SSH_KEY" root@"$REMOTE_SERVER" "docker start $c"
    done
}

# ----------------------------- RSYNC LIMITER (FIXED FINAL) -----------------------------

wait_for_rsync() {
    : "${RETRY_COUNT:=5}"
    : "${MAX_RSYNC_PROCS:=2}"
    : "${SLEEP:=2}"

    for i in $(seq 1 "$RETRY_COUNT"); do

        # ONLY COUNT LOCAL INITIATED RSYNC COMMANDS
        COUNT=$(ps -eo pid,cmd | grep "[r]sync .*${REMOTE_SERVER:-}" | wc -l || true)

        # fallback if REMOTE_SERVER not set yet
        if [[ -z "$REMOTE_SERVER" ]]; then
            COUNT=$(pgrep -x rsync | wc -l || true)
        fi

        if [[ "$COUNT" -ge "$MAX_RSYNC_PROCS" ]]; then
            warn "Waiting rsync slot ($COUNT/$MAX_RSYNC_PROCS)"
            sleep "$SLEEP"
        else
            return 0
        fi
    done

    error "Too many rsync processes"
    exit 1
}

# ----------------------------- RSYNC OPTIONS -----------------------------

get_rsync_opts() {
    if [[ -n "${PROFILE_RSYNC_OPTS[$PROFILE_NAME]:-}" ]]; then
        read -r -a RSYNC_OPTS <<< "${PROFILE_RSYNC_OPTS[$PROFILE_NAME]}"
    else
        RSYNC_OPTS=("${DEFAULT_RSYNC_OPTS[@]}")
    fi
}

# ----------------------------- STATUS -----------------------------

show_status() {
    echo "===== STATUS ====="
    echo "Local:   $LOCAL_SERVER_NAME"
    echo "Remote:  $REMOTE_SERVER_NAME"
    echo "IP:      $REMOTE_SERVER"
    echo "Profile: $PROFILE_NAME"
    echo "DryRun:  $DRY_RUN"
    echo "Logging: $ENABLE_LOGGING"
    echo "=================="
}