/**
 * HarborForge Plugin for OpenClaw
 *
 * Provides monitor-related tools and exposes OpenClaw metadata
 * for the HarborForge Monitor bridge (via monitor_port).
 *
 * Also integrates with HarborForge Calendar system to wake agents
 * for scheduled tasks (PLG-CAL-002, PLG-CAL-004).
 *
 * 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 'node:os';
import { definePluginEntry } from 'openclaw/plugin-sdk/plugin-entry';
import { MultiAgentScheduleCache } from './calendar/schedule-cache.js';
import { MultiAgentSchedulerHandle } from './calendar/multi-agent-handle.js';
import { getPluginConfig } from './core/config.js';
import { MonitorBridgeClient, type OpenClawMeta } from './core/monitor-bridge.js';
import type { OpenClawAgentInfo } from './core/openclaw-agents.js';
import { registerGatewayStartHook } from './hooks/gateway-start.js';
import { registerGatewayStopHook } from './hooks/gateway-stop.js';
import {
  createCalendarBridgeClient,
  CalendarScheduler,
} from './calendar/index.js';

interface PluginAPI {
  logger: {
    info: (...args: any[]) => void;
    error: (...args: any[]) => void;
    debug: (...args: any[]) => void;
    warn: (...args: any[]) => void;
  };
  version?: string;
  runtime?: {
    version?: string;
    config?: {
      loadConfig?: () => any;
    };
  };
  config?: Record<string, unknown>;
  pluginConfig?: Record<string, unknown>;
  on: (event: string, handler: () => void) => void;
  registerTool: (factory: (ctx: any) => any) => void;
  /** Spawn a sub-agent with task context (OpenClaw 2.1+) */
  spawn?: (options: {
    agentId?: string;
    task: string;
    model?: string;
    timeoutSeconds?: number;
  }) => Promise<{ sessionId: string; status: string }>;
  /** Get current agent status */
  getAgentStatus?: () => Promise<{ status: string } | null>;
}

function register(api: PluginAPI): void {
    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),
    };

    function resolveConfig() {
      return getPluginConfig(api);
    }

    /** Resolve agent ID from env, config, or fallback. */
    function resolveAgentId(): string {
      if (process.env.AGENT_ID) return process.env.AGENT_ID;
      const cfg = api.runtime?.config?.loadConfig?.();
      return cfg?.agents?.list?.[0]?.id ?? cfg?.agents?.defaults?.id ?? 'unknown';
    }

    /**
     * Get the monitor bridge client if monitor_port is configured.
     */
    function getBridgeClient(): MonitorBridgeClient | null {
      const live = resolveConfig();
      const port = live.monitor_port;
      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.runtime?.version || api.version || 'unknown',
          pluginVersion: '0.3.2', // Bumped for PLG-CAL-004
        },
        timestamp: new Date().toISOString(),
      };
    }

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

    // Calendar scheduler instance.
    //
    // In multi-agent sync mode (the only path today) this is a
    // {@link MultiAgentSchedulerHandle}. The legacy `CalendarScheduler` type
    // is retained in the union for compatibility with the typed-only single-
    // agent path that may be reintroduced later.
    let calendarScheduler: MultiAgentSchedulerHandle | CalendarScheduler | 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;

      let agentNames: string[] = [];
      try {
        const cfg = api.runtime?.config?.loadConfig?.();
        const agentsList = cfg?.agents?.list;
        if (Array.isArray(agentsList)) {
          agentNames = agentsList
            .map((a: any) => typeof a === 'string' ? a : a?.name)
            .filter(Boolean);
        }
      } catch { /* non-fatal */ }

      const meta: OpenClawMeta = {
        version: api.runtime?.version || api.version || 'unknown',
        plugin_version: '0.3.2',
        agents: agentNames.map(name => ({ name })),
      };

      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)');
      }
    }

    /**
     * Get current agent status from OpenClaw.
     * Falls back to querying backend if OpenClaw API unavailable.
     */
    async function getAgentStatus(): Promise<'idle' | 'on_call' | 'busy' | 'exhausted' | 'offline' | null> {
      // Try OpenClaw API first (if available)
      if (api.getAgentStatus) {
        try {
          const status = await api.getAgentStatus();
          if (status?.status) {
            return status.status as 'idle' | 'on_call' | 'busy' | 'exhausted' | 'offline';
          }
        } catch (err) {
          logger.debug('Failed to get agent status from OpenClaw API:', err);
        }
      }

      // Fallback: query backend for agent status
      const live = resolveConfig();
      const agentId = resolveAgentId();
      try {
        const response = await fetch(`${live.backendUrl}/calendar/agent/status?agent_id=${agentId}`, {
          headers: {
            'X-Agent-ID': agentId,
            'X-Claw-Identifier': live.identifier || hostname(),
          },
        });
        if (response.ok) {
          const data = await response.json();
          return data.status;
        }
      } catch (err) {
        logger.debug('Failed to get agent status from backend:', err);
      }

      return null;
    }

    /**
     * Wake agent via dispatchInboundMessage — same mechanism used by Discord plugin.
     * Direct in-process call, no WebSocket or CLI needed.
     */
    async function wakeAgent(
      agentId: string,
      dueSlots?: Array<{
        id?: number | null;
        virtual_id?: string | null;
        event_data?: any;
        scheduled_at?: string;
        priority?: number;
        slot_type?: string;
        [k: string]: unknown;
      }>
    ): Promise<boolean> {
      logger.info(`Waking agent ${agentId}: has due slots`);

      const sessionKey = `agent:${agentId}:hf-wakeup`;

      try {
        const sdkPath = 'openclaw/plugin-sdk/reply-runtime';
        const { dispatchInboundMessageWithDispatcher } = await import(
          /* webpackIgnore: true */ sdkPath
        );

        // api.config first (current public API). Fall back to deprecated
        // runtime.config.loadConfig() for older host versions. Both should
        // contain agents.list / channels for dispatch routing.
        const cfg = (api as any).config ?? api.runtime?.config?.loadConfig?.();
        if (!cfg) {
          logger.error('Cannot load OpenClaw config for dispatch');
          return false;
        }

        // Inline the highest-priority due slot's context so the agent does
        // not need a second round-trip to harborforge_calendar_status. The
        // agent can read event_data.task_code / task_title etc. directly.
        let slotBlock = '';
        const top = dueSlots && dueSlots.length ? dueSlots[0] : undefined;
        if (top) {
          slotBlock = `\n\nMatching slot:\n\`\`\`json\n${JSON.stringify(
            {
              slot_id: top.id ?? null,
              virtual_id: top.virtual_id ?? null,
              scheduled_at: top.scheduled_at ?? null,
              priority: top.priority ?? null,
              slot_type: top.slot_type ?? null,
              event_data: top.event_data ?? null,
            },
            null,
            2
          )}\n\`\`\``;
        }

        const wakeupMessage =
          `You have due slots. Follow the \`hf-wakeup\` workflow of skill ` +
          `\`hf-hangman-lab\` to proceed. Only reply \`WAKEUP_OK\` in this ` +
          `session.${slotBlock}`;

        const result = await dispatchInboundMessageWithDispatcher({
          ctx: {
            Body: wakeupMessage,
            SessionKey: sessionKey,
            From: 'harborforge-calendar',
            Provider: 'harborforge',
          },
          cfg,
          dispatcherOptions: {
            deliver: async (payload: any) => {
              const text = (payload.text || '').trim();
              logger.info(`Agent ${agentId} wakeup reply: ${text.slice(0, 100)}`);
            },
          },
        });

        logger.info(`Agent ${agentId} dispatched: ${result?.status || 'ok'}`);
        return true;

      } catch (err: any) {
        const msg = err?.message || err?.code || String(err);
        const stack = err?.stack?.split('\n').slice(0, 3).join(' | ') || '';
        logger.error(`Failed to dispatch agent for slot: ${msg} ${stack}`);
        return false;
      }
    }

    // (trackSessionCompletion removed — legacy single-agent poll loop that
    //  called calendarScheduler.completeCurrentSlot. The multi-agent path
    //  closes slots via the harborforge_calendar_complete tool, driven by
    //  the agent itself, not by a timer.)

    /**
     * Initialize and start the calendar scheduler.
     */
    function startCalendarScheduler(): void {
      const live = resolveConfig();

      // Create bridge client (claw-instance level, not per-agent)
      const calendarBridge = createCalendarBridgeClient(
        api,
        live.backendUrl || 'https://monitor.hangman-lab.top',
        'unused' // agentId no longer needed at bridge level
      );

      // Multi-agent sync + check loop
      const scheduleCache = new MultiAgentScheduleCache();

      const SYNC_INTERVAL_MS = 300_000; // 5 min
      const CHECK_INTERVAL_MS = 30_000; // 30 sec

      // Sync: pull all agent schedules from backend
      async function runSync() {
        try {
          const result = await calendarBridge.syncSchedules();
          if (result) {
            scheduleCache.sync(result.date, result.schedules);
            const status = scheduleCache.getStatus();
            logger.info(`Schedule synced: ${status.agentCount} agents, ${status.totalSlots} slots`);
          }
        } catch (err) {
          logger.warn(`Schedule sync failed: ${String(err)}`);
        }
      }

      // Track wakes already dispatched for a slot in the current sync
      // window — the simplified inline scheduler does not PATCH slot
      // status server-side, so without dedupe the check loop re-wakes
      // the same slot every 30s. Set is cleared by runSync (fresh wake
      // budget per sync).
      const wakedSlotKeys = new Set<string>();

      // Check: find agents with due slots and wake them
      async function runCheck() {
        const now = new Date();
        const agentsWithDue = scheduleCache.getAgentsWithDueSlots(now);

        for (const { agentId, slots } of agentsWithDue) {
          // Filter out slots we've already woken this sync window
          const fresh = slots.filter((s) => {
            const key = `${agentId}::${s.id ?? s.virtual_id ?? s.scheduled_at}`;
            if (wakedSlotKeys.has(key)) return false;
            return true;
          });
          if (fresh.length === 0) continue;

          // Check if agent is busy (best effort; backend may 405 the GET
          // — treat unknown as not-busy so wakeup still fires)
          let status: string | null = null;
          try {
            status = await calendarBridge.getAgentStatus(agentId);
          } catch {
            status = null;
          }
          if (status === 'busy' || status === 'offline' || status === 'exhausted') {
            continue;
          }

          // Wake the agent with the slot context inlined
          const ok = await wakeAgent(agentId, fresh);
          if (ok) {
            // Top slot is the one inlined in the wakeup message; record it as
            // the agent's "current" so harborforge_calendar_complete/abort/…
            // can resolve a slot without an explicit param.
            const top = fresh[0];
            if (top && calendarScheduler instanceof MultiAgentSchedulerHandle) {
              calendarScheduler.recordWoken(agentId, top);
            }
            for (const s of fresh) {
              const key = `${agentId}::${s.id ?? s.virtual_id ?? s.scheduled_at}`;
              wakedSlotKeys.add(key);
            }
          }
        }
      }

      // Initial sync (also resets the wake-dedupe window)
      const runSyncReset = async () => {
        wakedSlotKeys.clear();
        await runSync();
      };
      runSyncReset();

      // Start intervals
      const syncHandle = setInterval(runSyncReset, SYNC_INTERVAL_MS);
      const checkHandle = setInterval(runCheck, CHECK_INTERVAL_MS);

      // Install the multi-agent handle so calendar tools resolve per-caller.
      calendarScheduler = new MultiAgentSchedulerHandle({
        bridge: calendarBridge,
        cache: scheduleCache,
        syncHandle,
        checkHandle,
        logger,
      });

      logger.info('Calendar scheduler started (multi-agent sync mode)');
    }

    /**
     * Stop the calendar scheduler.
     */
    function stopCalendarScheduler(): void {
      if (calendarScheduler) {
        calendarScheduler.stop();
        calendarScheduler = null;
        logger.info('Calendar scheduler stopped');
      }
    }

    registerGatewayStartHook(api, {
      logger,
      pushMetaToMonitor,
      startCalendarScheduler,
      setMetaPushInterval(handle) {
        metaPushInterval = handle;
      },
    });

    registerGatewayStopHook(api, {
      logger,
      getMetaPushInterval() {
        return metaPushInterval;
      },
      clearMetaPushInterval() {
        metaPushInterval = null;
      },
      stopCalendarScheduler,
    });

    // Tool: plugin status
    api.registerTool((ctx) => ({
      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' };
        }

        // Get calendar scheduler status. In multi-agent mode `currentSlot`
        // depends on the caller, so look it up via ctx.agentId.
        const callerAgentId = ctx?.agentId ?? resolveAgentId();
        const calendarStatus = calendarScheduler
          ? calendarScheduler instanceof MultiAgentSchedulerHandle
            ? {
                running: calendarScheduler.isRunning(),
                processing: calendarScheduler.isProcessing(),
                mode: 'multi-agent',
                callerAgentId,
                currentSlot: calendarScheduler.resolveCurrentSlot(callerAgentId),
                isRestartPending: calendarScheduler.isRestartPending(),
              }
            : {
                running: calendarScheduler.isRunning(),
                processing: calendarScheduler.isProcessing(),
                mode: 'single-agent',
                currentSlot: calendarScheduler.getCurrentSlot(),
                isRestartPending: calendarScheduler.isRestartPending(),
              }
          : null;

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

    // Tool: calendar slot management
    api.registerTool((ctx) => ({
      name: 'harborforge_calendar_status',
      description: 'Get current calendar scheduler status and pending slots',
      parameters: {
        type: 'object',
        properties: {},
      },
      async execute() {
        if (!calendarScheduler) {
          return { error: 'Calendar scheduler not running' };
        }
        const callerAgentId = ctx?.agentId ?? resolveAgentId();
        if (calendarScheduler instanceof MultiAgentSchedulerHandle) {
          return {
            running: calendarScheduler.isRunning(),
            processing: calendarScheduler.isProcessing(),
            mode: 'multi-agent',
            callerAgentId,
            currentSlot: calendarScheduler.resolveCurrentSlot(callerAgentId),
            agentSlots: calendarScheduler.cachedSlotsFor(callerAgentId),
            state: calendarScheduler.getState(),
            isRestartPending: calendarScheduler.isRestartPending(),
            stateFilePath: calendarScheduler.getStateFilePath(),
          };
        }
        return {
          running: calendarScheduler.isRunning(),
          processing: calendarScheduler.isProcessing(),
          mode: 'single-agent',
          currentSlot: calendarScheduler.getCurrentSlot(),
          state: calendarScheduler.getState(),
          isRestartPending: calendarScheduler.isRestartPending(),
          stateFilePath: calendarScheduler.getStateFilePath(),
        };
      },
    }));

    // Tool: complete current slot (for agent to report completion)
    api.registerTool((ctx) => ({
      name: 'harborforge_calendar_complete',
      description: 'Complete the current calendar slot with actual duration',
      parameters: {
        type: 'object',
        properties: {
          actualDurationMinutes: {
            type: 'number',
            description: 'Actual time spent on the task in minutes',
          },
        },
        required: ['actualDurationMinutes'],
      },
      async execute(params: { actualDurationMinutes: number }) {
        if (!calendarScheduler) {
          return { error: 'Calendar scheduler not running' };
        }
        if (calendarScheduler instanceof MultiAgentSchedulerHandle) {
          const agentId = ctx?.agentId ?? resolveAgentId();
          const res = await calendarScheduler.completeSlot(agentId, params.actualDurationMinutes);
          return res.ok
            ? { success: true, message: 'Slot completed', slot: res.slot }
            : { error: res.error };
        }
        await calendarScheduler.completeCurrentSlot(params.actualDurationMinutes);
        return { success: true, message: 'Slot completed' };
      },
    }));

    // Tool: abort current slot (for agent to report failure)
    api.registerTool((ctx) => ({
      name: 'harborforge_calendar_abort',
      description: 'Abort the current calendar slot',
      parameters: {
        type: 'object',
        properties: {
          reason: {
            type: 'string',
            description: 'Reason for aborting',
          },
        },
      },
      async execute(params: { reason?: string }) {
        if (!calendarScheduler) {
          return { error: 'Calendar scheduler not running' };
        }
        if (calendarScheduler instanceof MultiAgentSchedulerHandle) {
          const agentId = ctx?.agentId ?? resolveAgentId();
          const res = await calendarScheduler.abortSlot(agentId, params.reason);
          return res.ok
            ? { success: true, message: 'Slot aborted', slot: res.slot }
            : { error: res.error };
        }
        await calendarScheduler.abortCurrentSlot(params.reason);
        return { success: true, message: 'Slot aborted' };
      },
    }));

    // Tool: pause current slot
    api.registerTool((ctx) => ({
      name: 'harborforge_calendar_pause',
      description: 'Pause the current calendar slot',
      parameters: {
        type: 'object',
        properties: {},
      },
      async execute() {
        if (!calendarScheduler) {
          return { error: 'Calendar scheduler not running' };
        }
        if (calendarScheduler instanceof MultiAgentSchedulerHandle) {
          const agentId = ctx?.agentId ?? resolveAgentId();
          const res = await calendarScheduler.pauseSlot(agentId);
          return res.ok
            ? { success: true, message: 'Slot paused', slot: res.slot }
            : { error: res.error };
        }
        await calendarScheduler.pauseCurrentSlot();
        return { success: true, message: 'Slot paused' };
      },
    }));

    // Tool: resume current slot
    api.registerTool((ctx) => ({
      name: 'harborforge_calendar_resume',
      description: 'Resume the paused calendar slot',
      parameters: {
        type: 'object',
        properties: {},
      },
      async execute() {
        if (!calendarScheduler) {
          return { error: 'Calendar scheduler not running' };
        }
        if (calendarScheduler instanceof MultiAgentSchedulerHandle) {
          const agentId = ctx?.agentId ?? resolveAgentId();
          const res = await calendarScheduler.resumeSlot(agentId);
          return res.ok
            ? { success: true, message: 'Slot resumed', slot: res.slot }
            : { error: res.error };
        }
        await calendarScheduler.resumeCurrentSlot();
        return { success: true, message: 'Slot resumed' };
      },
    }));

    // Tool: check ScheduledGatewayRestart status
    api.registerTool(() => ({
      name: 'harborforge_restart_status',
      description: 'Check if a gateway restart is pending (PLG-CAL-004)',
      parameters: {
        type: 'object',
        properties: {},
      },
      async execute() {
        if (!calendarScheduler) {
          return { error: 'Calendar scheduler not running' };
        }

        const isPending = calendarScheduler.isRestartPending();
        const stateFilePath = calendarScheduler.getStateFilePath();

        return {
          isRestartPending: isPending,
          stateFilePath: stateFilePath,
          message: isPending
            ? 'A gateway restart has been scheduled. The scheduler has been paused.'
            : 'No gateway restart is pending.',
        };
      },
    }));

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

// HarborForge's local PluginAPI is broader than the standard OpenClawPluginApi
// (it surfaces optional `version`/`runtime`/`spawn` accessors that older
// OpenClaw builds exposed). The cast at the definePluginEntry boundary
// acknowledges that gap — the runtime api object is whatever the gateway
// passes us, and each access is guarded with optional chaining / fallbacks.
export default definePluginEntry({
  id: 'harbor-forge',
  name: 'HarborForge',
  description: 'HarborForge plugin for OpenClaw - project management, monitoring, and CLI integration',
  register: register as (api: any) => void,
});