/**
 * HarborForge Plugin for OpenClaw
 *
 * Provides monitor-related tools and exposes OpenClaw metadata
 * for the HarborForge Monitor bridge (via monitor_port).
 *
 * Sidecar architecture has been removed. Telemetry data is now
 * served directly by the plugin when Monitor queries via the
 * local monitor_port communication path.
 */
import { hostname, freemem, totalmem, uptime, loadavg, platform } from 'os';
import { getLivePluginConfig, type HarborForgeMonitorConfig } from './core/live-config';
import { MonitorBridgeClient, type OpenClawMeta } from './core/monitor-bridge';

interface PluginAPI {
  logger: {
    info: (...args: any[]) => void;
    error: (...args: any[]) => void;
    debug: (...args: any[]) => void;
    warn: (...args: any[]) => void;
  };
  version?: string;
  config?: Record<string, unknown>;
  pluginConfig?: Record<string, unknown>;
  on: (event: string, handler: () => void) => void;
  registerTool: (factory: (ctx: any) => any) => void;
}

export default {
  id: 'harbor-forge',
  name: 'HarborForge',
  register(api: PluginAPI) {
    const logger = api.logger || {
      info: (...args: any[]) => console.log('[HarborForge]', ...args),
      error: (...args: any[]) => console.error('[HarborForge]', ...args),
      debug: (...args: any[]) => console.debug('[HarborForge]', ...args),
      warn: (...args: any[]) => console.warn('[HarborForge]', ...args),
    };

    const baseConfig: HarborForgeMonitorConfig = {
      enabled: true,
      backendUrl: 'https://monitor.hangman-lab.top',
      identifier: '',
      reportIntervalSec: 30,
      httpFallbackIntervalSec: 60,
      logLevel: 'info',
      ...(api.pluginConfig || {}),
    };

    function resolveConfig() {
      return getLivePluginConfig(api, baseConfig);
    }

    /**
     * Get the monitor bridge client if monitor_port is configured.
     * Legacy alias monitorPort is still accepted.
     */
    function getBridgeClient(): MonitorBridgeClient | null {
      const live = resolveConfig() as any;
      const port = live.monitor_port ?? live.monitorPort;
      if (!port || port <= 0) return null;
      return new MonitorBridgeClient(port);
    }

    /**
     * Collect current system telemetry snapshot.
     * This data is exposed to the Monitor bridge when it queries the plugin.
     */
    function collectTelemetry() {
      const live = resolveConfig();
      const load = loadavg();
      return {
        identifier: live.identifier || hostname(),
        platform: platform(),
        hostname: hostname(),
        uptime: uptime(),
        memory: {
          total: totalmem(),
          free: freemem(),
          used: totalmem() - freemem(),
          usagePercent: ((totalmem() - freemem()) / totalmem()) * 100,
        },
        load: {
          avg1: load[0],
          avg5: load[1],
          avg15: load[2],
        },
        openclaw: {
          version: api.version || 'unknown',
          pluginVersion: '0.2.0',
        },
        timestamp: new Date().toISOString(),
      };
    }

    // Periodic metadata push interval handle
    let metaPushInterval: ReturnType<typeof setInterval> | null = null;

    /**
     * Push OpenClaw metadata to the Monitor bridge.
     * This enriches Monitor heartbeats with OpenClaw version/plugin/agent info.
     * Failures are non-fatal — Monitor continues to work without this data.
     */
    async function pushMetaToMonitor() {
      const bridgeClient = getBridgeClient();
      if (!bridgeClient) return;

      const meta: OpenClawMeta = {
        version: api.version || 'unknown',
        plugin_version: '0.2.0',
        agents: [], // TODO: populate from api agent list when available
      };

      const ok = await bridgeClient.pushOpenClawMeta(meta);
      if (ok) {
        logger.debug('pushed OpenClaw metadata to Monitor bridge');
      } else {
        logger.debug('Monitor bridge unreachable for metadata push (non-fatal)');
      }
    }

    api.on('gateway_start', () => {
      logger.info('HarborForge plugin active');

      // Push metadata to Monitor bridge on startup and periodically.
      // Interval aligns with typical Monitor heartbeat cycle (30s).
      // If Monitor bridge is unreachable, pushes silently fail.
      const live = resolveConfig();
      const intervalSec = live.reportIntervalSec || 30;

      // Initial push (delayed 2s to let Monitor bridge start)
      setTimeout(() => pushMetaToMonitor(), 2000);

      metaPushInterval = setInterval(
        () => pushMetaToMonitor(),
        intervalSec * 1000,
      );
    });

    api.on('gateway_stop', () => {
      logger.info('HarborForge plugin stopping');
      if (metaPushInterval) {
        clearInterval(metaPushInterval);
        metaPushInterval = null;
      }
    });

    // Tool: plugin status
    api.registerTool(() => ({
      name: 'harborforge_status',
      description: 'Get HarborForge plugin status and current telemetry snapshot',
      parameters: {
        type: 'object',
        properties: {},
      },
      async execute() {
        const live = resolveConfig();
        const bridgeClient = getBridgeClient();
        let monitorBridge = null;

        if (bridgeClient) {
          const health = await bridgeClient.health();
          monitorBridge = health
            ? { connected: true, ...health }
            : { connected: false, error: 'Monitor bridge unreachable' };
        }

        return {
          enabled: live.enabled !== false,
          config: {
            backendUrl: live.backendUrl,
            identifier: live.identifier || hostname(),
            monitorPort: (live as any).monitor_port ?? (live as any).monitorPort ?? null,
            reportIntervalSec: live.reportIntervalSec,
            hasApiKey: Boolean(live.apiKey),
          },
          monitorBridge,
          telemetry: collectTelemetry(),
        };
      },
    }));

    // Tool: telemetry snapshot (for Monitor bridge queries)
    api.registerTool(() => ({
      name: 'harborforge_telemetry',
      description: 'Get current system telemetry data for HarborForge Monitor',
      parameters: {
        type: 'object',
        properties: {},
      },
      async execute() {
        return collectTelemetry();
      },
    }));

    // Tool: query Monitor bridge for host hardware telemetry
    api.registerTool(() => ({
      name: 'harborforge_monitor_telemetry',
      description: 'Query HarborForge Monitor bridge for host hardware telemetry (CPU, memory, disk, etc.)',
      parameters: {
        type: 'object',
        properties: {},
      },
      async execute() {
        const bridgeClient = getBridgeClient();
        if (!bridgeClient) {
          return {
            error: 'Monitor bridge not configured (monitor_port not set or 0)',
          };
        }

        const data = await bridgeClient.telemetry();
        if (!data) {
          return {
            error: 'Monitor bridge unreachable',
          };
        }

        return data;
      },
    }));

    logger.info('HarborForge plugin registered (id: harbor-forge)');
  },
};