#!/bin/bash
# services/meshcentral.sh — Self-hosted remote device management server (MeshCentral).
# Part of the modular post-install system (sourced by setup.sh).
#
# Can also be run standalone on any machine:
#   sudo bash meshcentral.sh
# (Docker must already be installed when run standalone)
#
# Ported from ubuntu-post-install-24.04-crowdsec.sh (# ---- MESHCENTRAL SERVER ----).
# Own ~/docker/meshcentral/ with a standalone docker-compose.yml + .env.
# HTTPS on port 4430, agent listener on 4433. First visit: create admin account.

# ── Standalone bootstrap ──────────────────────────────────────────────────────
# Detected when the script is executed directly rather than sourced by setup.sh.
# Sets up helpers and globals, then defers execution until after the function
# definition at the bottom of this file.
if [[ "${BASH_SOURCE[0]}" == "${0}" ]]; then
    [[ "$(id -u)" == "0" ]] || { echo "Run with sudo: sudo bash $0"; exit 1; }

    _SELF_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
    _COMMON="$_SELF_DIR/../lib/common.sh"

    if [[ -f "$_COMMON" ]]; then
        # Full repo present — use the real helpers (picks up ~/docker/.config too)
        # shellcheck source=../lib/common.sh
        source "$_COMMON"
    else
        # One-off copy — inline minimal stubs so the script works without the repo
        log_info()    { echo -e "\033[0;34m[INFO]\033[0m $*"; }
        log_success() { echo -e "\033[0;32m[OK]\033[0m $*"; }
        log_warning() { echo -e "\033[1;33m[WARN]\033[0m $*"; }
        log_error()   { echo -e "\033[0;31m[ERROR]\033[0m $*" >&2; }

        require_docker() {
            command -v docker &>/dev/null || {
                log_error "Docker not found. Install it first:"
                log_error "  curl -fsSL https://get.docker.com | sudo sh"
                return 1
            }
            docker compose version &>/dev/null || {
                log_error "Docker Compose plugin missing:"
                log_error "  sudo apt-get install -y docker-compose-plugin"
                return 1
            }
        }

        ensure_docker_dir_ownership() {
            chown -R "$ACTUAL_USER:$ACTUAL_USER" "$@" 2>/dev/null || true
        }

        port_in_use() {
            local _port="$1" _proto="${2:-tcp}"
            local _flag="-tlnH"
            [ "$_proto" = "udp" ] && _flag="-ulnH"
            ss "$_flag" "sport = :${_port}" 2>/dev/null | grep -q .
        }

        find_free_port() {
            local _varname="$1" _port="$2" _proto="${3:-tcp}"
            while port_in_use "$_port" "$_proto"; do
                _port=$((_port + 1))
            done
            eval "$_varname='$_port'"
        }

        # Match common.sh's eval-based pattern so local vars in install_* are set correctly
        prompt_text() {
            local _q="$1" _def="$2" _var="$3" _r
            [[ "${UNATTENDED:-false}" == "true" ]] && { eval "$_var='$_def'"; return; }
            read -r -p "  $_q " _r
            eval "$_var='${_r:-$_def}'"
        }

        prompt_yn() {
            local _q="$1" _def="$2" _var="$3" _r
            [[ "${UNATTENDED:-false}" == "true" ]] && { eval "$_var='$_def'"; return; }
            read -r -p "  $_q " _r
            eval "$_var='${_r:-$_def}'"
        }

        configure_caddy_for_service() {
            local _name="$1" _upstream="$2" _subdomain="$3" _extra="${4:-}"
            local _caddy_dir="$DOCKER_DIR/caddy"
            local _caddyfile="$_caddy_dir/Caddyfile"
            local _display_port="${_upstream##*:}"

            # Determine mode: local Caddy, remote Caddy, or none
            local _mode="none"
            [[ -d "$_caddy_dir" ]] && _mode="local"
            [[ -n "${CADDY_REMOTE_HOST:-}" ]] && [[ "$_mode" != "local" ]] && _mode="remote"
            [[ "$_mode" == "none" ]] && {
                log_info "Access $_name directly on port $_display_port."
                return 0
            }

            echo ""
            local _do_caddy=""
            if [[ "$_mode" == "remote" ]]; then
                log_info "Remote Caddy configured (${CADDY_REMOTE_HOST})."
                log_info "A snippet file will be saved to ~/docker/caddy-snippets/."
            fi
            read -r -p "  Configure Caddy reverse proxy for $_name? [y/N]: " _do_caddy
            [[ "${_do_caddy,,}" == "y" ]] || {
                log_info "Skipping — access at: http://localhost:$_display_port"
                return 0
            }

            # Domain prompt — pre-fill from SITE_DOMAIN when available
            local _default_domain=""
            if [[ -n "${SITE_DOMAIN:-}" ]] && [[ "$SITE_DOMAIN" != "example.com" ]]; then
                _default_domain="${_subdomain}.${SITE_DOMAIN}"
                log_info "Default: $_default_domain"
            fi
            local _domain=""
            read -r -p "  Domain [${_default_domain:-required}]: " _domain
            _domain="${_domain:-$_default_domain}"
            [[ -n "$_domain" ]] || { log_warning "No domain entered — skipping Caddy."; return 0; }

            # Build upstream — remote Caddy uses host IP:port, not container name
            local _block_upstream="$_upstream"
            if [[ "$_mode" == "remote" ]]; then
                _block_upstream="${CADDY_REMOTE_HOST}:${_display_port}"
            fi

            local _site_block
            _site_block="$(cat << CBLOCK

# $_name
${_domain} {
    reverse_proxy ${_block_upstream}

    header {
        Strict-Transport-Security "max-age=31536000; includeSubDomains; preload"
        X-Content-Type-Options "nosniff"
        X-Frame-Options "SAMEORIGIN"
        Referrer-Policy "strict-origin-when-cross-origin"
    }

    log {
        output file /var/log/caddy/${_domain}.log
        format json
    }
${_extra}
}
CBLOCK
)"

            if [[ "$_mode" == "local" ]]; then
                if [[ -f "$_caddyfile" ]]; then
                    local _bk="$_caddy_dir/Caddyfile.backup.$(date +%Y%m%d-%H%M%S)"
                    cp "$_caddyfile" "$_bk"
                    log_info "Backed up Caddyfile to $(basename "$_bk")"
                else
                    touch "$_caddyfile"
                fi

                if grep -q "^${_domain}" "$_caddyfile" 2>/dev/null; then
                    log_warning "$_domain already in Caddyfile"
                    local _ow=""
                    read -r -p "  Overwrite? [y/N]: " _ow
                    [[ "${_ow,,}" == "y" ]] || { log_info "Keeping existing entry."; return 0; }
                    sed -i "/^${_domain}/,/^}/d" "$_caddyfile"
                fi

                printf '%s\n' "$_site_block" >> "$_caddyfile"
                log_success "Added $_domain to Caddyfile"
                docker exec caddy caddy fmt --overwrite /etc/caddy/Caddyfile 2>/dev/null || true
                if docker exec caddy caddy reload --config /etc/caddy/Caddyfile 2>/dev/null; then
                    log_success "$_name accessible at: https://$_domain"
                else
                    log_warning "Reload failed — check: docker logs caddy"
                    log_info "Manual reload: docker exec caddy caddy reload --config /etc/caddy/Caddyfile"
                fi
            else
                local _snippet_dir="$DOCKER_DIR/caddy-snippets"
                local _snippet_file="$_snippet_dir/${_subdomain}.caddy"
                mkdir -p "$_snippet_dir"
                printf '%s\n' "$_site_block" > "$_snippet_file"
                chown "$ACTUAL_USER:$ACTUAL_USER" "$_snippet_file" 2>/dev/null || true
                log_success "Snippet saved: $_snippet_file"
                log_info "Copy to Caddy machine:"
                log_info "  scp $_snippet_file caddy-host:~/caddy-snippets/"
                log_info "  rsync -av $_snippet_dir/ caddy-host:~/caddy-snippets/  (all at once)"
            fi
        }
        write_readme() {
            local _dir="$1"; shift
            mkdir -p "$_dir"
            cat > "$_dir/README.md"
        }
    fi

    # Globals — ACTUAL_USER/ACTUAL_HOME must come before DOCKER_DIR
    # ($HOME under sudo is /root, not the real user's home)
    ACTUAL_USER="${ACTUAL_USER:-${SUDO_USER:-$USER}}"
    ACTUAL_HOME="$(getent passwd "$ACTUAL_USER" 2>/dev/null | cut -d: -f6 || echo "${HOME:-/root}")"
    DOCKER_DIR="${DOCKER_DIR:-$ACTUAL_HOME/docker}"
    DRY_RUN="${DRY_RUN:-false}"
    UNATTENDED="${UNATTENDED:-false}"
    SITE_TZ="${SITE_TZ:-$(cat /etc/timezone 2>/dev/null || echo UTC)}"
    SITE_DOMAIN="${SITE_DOMAIN:-example.com}"
    SITE_CADDY_NET="${SITE_CADDY_NET:-caddy_net}"

    register_service() { :; }   # no-op — no wizard to register into
    _RUN_STANDALONE=1
fi
# ─────────────────────────────────────────────────────────────────────────────

register_service meshcentral utilities "Self-hosted remote device management server (MeshCentral)" 4430

install_meshcentral() {
    require_docker || return 1

    # ── Instance selection ───────────────────────────────────────────────────
    # First instance keeps the plain "meshcentral" name/paths/ports exactly as
    # before (zero behavior change for anyone with a single instance). Only
    # asking to add a second one introduces suffixed naming — same pattern as
    # services/mattermost.sh and services/wordpress.sh. Two ports (web + agent)
    # move together so they stay easy to reason about instance-to-instance.
    local MC_DIR="$DOCKER_DIR/meshcentral"
    local INSTANCE_SUFFIX="" CONTAINER="meshcentral"
    local WEB_PORT="4430" AGENT_PORT="4433"

    if [ "$DRY_RUN" = true ]; then
        echo "[DRY-RUN] MeshCentral would:"
        echo "  - Offer to add a new, separate instance if one already exists"
        echo "  - Create \$DOCKER_DIR/meshcentral(-<name>) with docker-compose.yml + .env (data/ files/ backups/)"
        echo "  - Prompt for hostname (domain or IP for agent connections)"
        echo "  - Expose port 4430 (HTTPS web) and 4433 (agent), auto-scanned for additional instances"
        echo "  - Offer a Caddy reverse proxy and to start the container"
        return 0
    fi

    if [ -d "$MC_DIR" ]; then
        echo ""
        echo "  MeshCentral is already installed at $MC_DIR."
        echo "    1) Manage that install (update / full reinstall / cancel)"
        echo "    2) Add a NEW, separate MeshCentral instance alongside it (its own"
        echo "       server, devices, and ports — full isolation)"
        echo ""
        local _TOP_CHOICE=""
        prompt_text "  Choice [1/2]:" "1" _TOP_CHOICE
        if [ "$_TOP_CHOICE" = "2" ]; then
            local _suffix=""
            while true; do
                prompt_text "  Short name for the new instance (letters/numbers/hyphens, e.g. 'clients'):" "" _suffix
                _suffix="$(echo "$_suffix" | tr -cs 'a-zA-Z0-9-' '-' | sed 's/^-*//;s/-*$//')"
                if [ -z "$_suffix" ]; then
                    log_warning "Name can't be empty."; continue
                fi
                if [ -d "$DOCKER_DIR/meshcentral-$_suffix" ]; then
                    log_warning "meshcentral-$_suffix already exists — pick another name."; continue
                fi
                break
            done
            INSTANCE_SUFFIX="$_suffix"
            MC_DIR="$DOCKER_DIR/meshcentral-$_suffix"
            CONTAINER="meshcentral-$_suffix"
            log_info "New instance: $MC_DIR"
        fi
    fi

    # Scan for free ports unconditionally, moving both together — not just
    # when adding an explicit additional instance. A plain first install can
    # just as easily collide with an unrelated service that already claimed
    # one of these default ports — see CLAUDE.md's "Port collision
    # avoidance" section.
    while port_in_use "$WEB_PORT" || port_in_use "$AGENT_PORT"; do
        WEB_PORT=$((WEB_PORT + 1))
        AGENT_PORT=$((AGENT_PORT + 1))
    done

    local MC_HOSTNAME=""
    prompt_text "MeshCentral hostname (domain or IP) [localhost]:" "localhost" MC_HOSTNAME
    MC_HOSTNAME="${MC_HOSTNAME:-localhost}"

    mkdir -p "$MC_DIR"
    ensure_docker_dir_ownership "$MC_DIR"
    cd "$MC_DIR" || return 1

    # Mirrors configure_caddy_for_service's own mode resolution (lib/common.sh):
    # explicit CADDY_MODE from the site config wins, then a local ~/docker/caddy,
    # then the legacy CADDY_REMOTE_HOST var. Only "local" joins caddy_net — a
    # remote Caddy box can't resolve container names on this host's bridge
    # network anyway; it reaches this service via the host's published port.
    local _CADDY_MODE="${CADDY_MODE:-none}"
    [ "$_CADDY_MODE" = "none" ] && [ -d "$DOCKER_DIR/caddy" ] && _CADDY_MODE="local"
    [ "$_CADDY_MODE" = "none" ] && [ -n "${CADDY_REMOTE_HOST:-}" ] && _CADDY_MODE="remote"

    local _CADDY_NET_BLOCK=""
    local _CADDY_NET_SECTION=""
    if [ "$_CADDY_MODE" = "local" ]; then
        _CADDY_NET_BLOCK="    networks:
      - caddy_net
"
        _CADDY_NET_SECTION="
networks:
  caddy_net:
    external: true
    name: ${SITE_CADDY_NET:-caddy_net}
"
    fi

    cat > docker-compose.yml << MC_COMPOSE
name: $CONTAINER

services:
  meshcentral:
    image: ghcr.io/ylianst/meshcentral:latest
    container_name: $CONTAINER
    hostname: $CONTAINER
    restart: unless-stopped
    environment:
      - NODE_ENV=production
      - HOSTNAME=\${MC_HOSTNAME:-localhost}
      - REVERSE_PROXY=\${MC_REVERSE_PROXY:-false}
      - REVERSE_PROXY_TLS_PORT=\${MC_TLS_PORT:-443}
      - IFRAME=false
      - ALLOW_NEW_ACCOUNTS=true
      - WEBRTC=true
    volumes:
      - ./data:/opt/meshcentral/meshcentral-data
      - ./files:/opt/meshcentral/meshcentral-files
      - ./backups:/opt/meshcentral/meshcentral-backups
    ports:
      - "${WEB_PORT}:443"
      - "${AGENT_PORT}:4433"
${_CADDY_NET_BLOCK}${_CADDY_NET_SECTION}
MC_COMPOSE

    cat > .env << MC_ENV
MC_HOSTNAME=$MC_HOSTNAME
MC_REVERSE_PROXY=false
MC_TLS_PORT=443
CADDY_NET=$SITE_CADDY_NET
MC_ENV

    mkdir -p data files backups
    chown -R "$ACTUAL_USER:$ACTUAL_USER" "$MC_DIR"
    log_success "MeshCentral${INSTANCE_SUFFIX:+ ($INSTANCE_SUFFIX)} configured at $MC_DIR (web port $WEB_PORT, agent port $AGENT_PORT)"

    configure_caddy_for_service "MeshCentral${INSTANCE_SUFFIX:+ ($INSTANCE_SUFFIX)}" "${CONTAINER}:443" "mesh${INSTANCE_SUFFIX:+-$INSTANCE_SUFFIX}"

    write_readme "$MC_DIR" << MD
# MeshCentral${INSTANCE_SUFFIX:+ — $INSTANCE_SUFFIX}

Self-hosted remote device management — remotely access, manage, and monitor
all your computers from a single web interface. Install agents on each device.
$( [ -n "$INSTANCE_SUFFIX" ] && echo "
This is a separate, fully isolated instance (own server, own devices, own
ports) — not shared devices with another MeshCentral instance.")

- Web UI: https://localhost:${WEB_PORT}  (self-signed cert on first launch)
- Agent listener: port ${AGENT_PORT} (devices connect here — forward this port if remote)
- Hostname: \`$MC_HOSTNAME\` (update \`MC_HOSTNAME\` in .env if it changes)
- App data: \`data/\`, \`files/\`, \`backups/\`

## Manage
\`\`\`bash
cd $MC_DIR
docker compose up -d      # start
docker compose down       # stop
docker compose logs -f    # logs
docker compose pull && docker compose up -d   # update
\`\`\`

## First launch
1. Open https://localhost:${WEB_PORT} (accept the self-signed cert warning)
2. Create your admin account
3. Go to "My Devices" → "+ Add Device" → download the agent for each OS
4. Install the agent on every computer you want to manage

## Remote access
For devices outside your LAN to connect:
- Forward **TCP port ${AGENT_PORT}** on your router to this server
- Set \`MC_HOSTNAME\` in \`.env\` to your public domain/IP, then restart

## Docs
https://meshcentral.com/docs/
MD

    local START_MC=""
    prompt_yn "Start MeshCentral${INSTANCE_SUFFIX:+ ($INSTANCE_SUFFIX)} now? (y/n):" "y" START_MC
    if [ "$START_MC" = "y" ] || [ "$START_MC" = "Y" ]; then
        docker compose up -d && log_success "MeshCentral${INSTANCE_SUFFIX:+ ($INSTANCE_SUFFIX)} started" || log_warning "Failed to start — check: docker compose logs"
    fi

    echo ""
    echo "  Access at:  https://localhost:${WEB_PORT}  (accept self-signed cert)"
    echo "  First visit: create your admin account"
    echo ""
}

# Run immediately when executed directly (deferred until after function definition)
[[ "${_RUN_STANDALONE:-0}" == 1 ]] && install_meshcentral