#!/bin/bash
# -----------------------------------------------------------------------------------------------
# ----------------- UNRAID OPS COMMON LIBRARY (FINAL STABLE FRAMEWORK v2) -----------------------
# -----------------------------------------------------------------------------------------------

# ----------------------------- ICONS -----------------------------
ICON_INFO="ℹ️"
ICON_WARN="⚠️"
ICON_ERROR="❌"
ICON_SUCCESS="✅"
ICON_RUN="🚀"
ICON_STOP="🛑"
ICON_STOPPED="🟢"
ICON_SYNC="🔄"

# ----------------------------- LOGGING -----------------------------
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] $*"; }

# ----------------------------- LOAD MASTER CONFIG -----------------------------
# MUST be defined before calling engine
# Example:
# source /boot/config/master.conf
if [[ -n "${MASTER_CONF_PATH:-}" ]]; then
    source "$MASTER_CONF_PATH"
fi

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

    CLEAN_ARGS=()

    for ARG in "$@"; do
        case "$ARG" in
            --dry-run|-n) DRY_RUN=true ;;
            --log) ENABLE_LOGGING=true ;;
            --no-log) ENABLE_LOGGING=false ;;
            --status) SHOW_STATUS=true ;;
            *) CLEAN_ARGS+=("$ARG") ;;
        esac
    done

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

# ----------------------------- 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 -----------------------------
resolve_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() {
    [[ ${#CRITICAL_CONTAINER_NAMES[@]} -eq 0 ]] && return

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

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

        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")

            if ssh -i "$SSH_KEY" root@"$REMOTE_SERVER" "docker stop $c" >/dev/null; then
                success "$c stopped"
            else
                error "Failed to stop $c"
            fi
        else
            echo "$ICON_STOPPED $c already stopped"
        fi
    done
}

start_containers() {
    [[ ${#RUNNING_CONTAINERS[@]} -eq 0 ]] && return

    info "Starting containers..."

    for c in "${RUNNING_CONTAINERS[@]}"; do
        info "Starting $c"

        if ssh -i "$SSH_KEY" root@"$REMOTE_SERVER" "docker start $c" >/dev/null; then
            success "$c started"
        else
            error "Failed to start $c"
        fi
    done
}

# ----------------------------- RSYNC LIMITER -----------------------------
wait_for_rsync() {
    : "${RETRY_COUNT:=5}"
    : "${MAX_RSYNC_PROCS:=2}"
    : "${SLEEP:=2}"

    for _ in $(seq 1 "$RETRY_COUNT"); do
        COUNT=$(pgrep -x rsync | wc -l || true)

        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
}

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

DEFAULT_RSYNC_OPTS=(
    --archive
    --delete
    --partial
    --compress
    --info=progress2
    --stats
)

# -----------------------------------------------------------------------------------------------
# ----------------------------- PROFILE HANDLING (FROM MASTER.CONF) ------------------------------
# -----------------------------------------------------------------------------------------------

get_rsync_opts() {

    RSYNC_OPTS=("${DEFAULT_RSYNC_OPTS[@]}")

    # Ensure profile map exists
    if [[ -z "${PROFILE_BW_LIMIT[*]}" ]]; then
        warn "PROFILE_BW_LIMIT missing from Master.conf - using unlimited"
        declare -A PROFILE_BW_LIMIT
    fi

    BW_LIMIT="${PROFILE_BW_LIMIT[$PROFILE_NAME]:-0}"

    if [[ "$BW_LIMIT" -gt 0 ]]; then
        RSYNC_OPTS+=(--bwlimit="$BW_LIMIT")
        log "bwlimit=${BW_LIMIT}KB/s applied (profile: $PROFILE_NAME)"
    else
        log "bwlimit unlimited (profile: $PROFILE_NAME)"
    fi

    if [[ "${ENABLE_PROGRESS:-false}" == true ]]; then
        log "Progress mode enabled"
    fi
}

# ----------------------------- RSYNC EXECUTION (FIXED OUTPUT) -----------------------------
run_rsync() {

    wait_for_rsync
    get_rsync_opts

    echo "🚀 Running rsync..."

    # IMPORTANT FIX:
    # - no --quiet
    # - no output suppression
    # - direct execution for real-time streaming

    rsync "${RSYNC_OPTS[@]}" \
        "$SRC/" \
        "root@$REMOTE_SERVER:$DEST/"
}

# ----------------------------- STATUS -----------------------------
show_status() {
    echo "===== SYNC STATUS ====="
    echo "Local:    $LOCAL_SERVER_NAME"
    echo "Remote:   $REMOTE_SERVER_NAME"
    echo "IP:       $REMOTE_SERVER"
    echo "Profile:  $PROFILE_NAME"
    echo "Progress: ${ENABLE_PROGRESS:-false}"
    echo "======================="
}