/**
 * NanoClaw — main entry point.
 *
 * Thin orchestrator: init DB, run migrations, start channel adapters,
 * start delivery polls, start sweep, handle shutdown.
 */
import path from 'path';

import { DATA_DIR } from './config.js';
import { initDb } from './db/connection.js';
import { runMigrations } from './db/migrations/index.js';
import { getMessagingGroupsByChannel, getMessagingGroupAgents } from './db/messaging-groups.js';
import { ensureContainerRuntimeRunning, cleanupOrphans } from './container-runtime.js';
import { startActiveDeliveryPoll, startSweepDeliveryPoll, setDeliveryAdapter, stopDeliveryPolls } from './delivery.js';
import { startHostSweep, stopHostSweep } from './host-sweep.js';
import {
  ONECLI_ACTION,
  resolveOneCLIApproval,
  startOneCLIApprovalHandler,
  stopOneCLIApprovalHandler,
} from './onecli-approvals.js';
import { routeInbound } from './router.js';
import {
  getPendingQuestion,
  deletePendingQuestion,
  getPendingApproval,
  deletePendingApproval,
  getSession,
} from './db/sessions.js';
import { getAgentGroup } from './db/agent-groups.js';
import { updateContainerConfig } from './container-config.js';
import { writeSessionMessage } from './session-manager.js';
import { wakeContainer, buildAgentGroupImage, killContainer } from './container-runner.js';
import { log } from './log.js';

// Channel barrel — each enabled channel self-registers on import.
// Channel skills uncomment lines in channels/index.ts to enable them.
import './channels/index.js';

import type { ChannelAdapter, ChannelSetup, ConversationConfig } from './channels/adapter.js';
import { initChannelAdapters, teardownChannelAdapters, getChannelAdapter } from './channels/channel-registry.js';

async function main(): Promise<void> {
  log.info('NanoClaw starting');

  // 1. Init central DB
  const dbPath = path.join(DATA_DIR, 'v2.db');
  const db = initDb(dbPath);
  runMigrations(db);
  log.info('Central DB ready', { path: dbPath });

  // 2. Container runtime
  ensureContainerRuntimeRunning();
  cleanupOrphans();

  // 3. Channel adapters
  await initChannelAdapters((adapter: ChannelAdapter): ChannelSetup => {
    const conversations = buildConversationConfigs(adapter.channelType);
    return {
      conversations,
      onInbound(platformId, threadId, message) {
        routeInbound({
          channelType: adapter.channelType,
          platformId,
          threadId,
          message: {
            id: message.id,
            kind: message.kind,
            content: JSON.stringify(message.content),
            timestamp: message.timestamp,
          },
        }).catch((err) => {
          log.error('Failed to route inbound message', { channelType: adapter.channelType, err });
        });
      },
      onMetadata(platformId, name, isGroup) {
        log.info('Channel metadata discovered', {
          channelType: adapter.channelType,
          platformId,
          name,
          isGroup,
        });
      },
      onAction(questionId, selectedOption, userId) {
        handleQuestionResponse(questionId, selectedOption, userId).catch((err) => {
          log.error('Failed to handle question response', { questionId, err });
        });
      },
    };
  });

  // 4. Delivery adapter bridge — dispatches to channel adapters
  const deliveryAdapter = {
    async deliver(
      channelType: string,
      platformId: string,
      threadId: string | null,
      kind: string,
      content: string,
      files?: import('./channels/adapter.js').OutboundFile[],
    ): Promise<string | undefined> {
      const adapter = getChannelAdapter(channelType);
      if (!adapter) {
        log.warn('No adapter for channel type', { channelType });
        return;
      }
      return adapter.deliver(platformId, threadId, { kind, content: JSON.parse(content), files });
    },
    async setTyping(channelType: string, platformId: string, threadId: string | null): Promise<void> {
      const adapter = getChannelAdapter(channelType);
      await adapter?.setTyping?.(platformId, threadId);
    },
  };
  setDeliveryAdapter(deliveryAdapter);

  // 5. Start delivery polls
  startActiveDeliveryPoll();
  startSweepDeliveryPoll();
  log.info('Delivery polls started');

  // 6. Start host sweep
  startHostSweep();
  log.info('Host sweep started');

  // 7. Start OneCLI manual-approval handler
  startOneCLIApprovalHandler(deliveryAdapter);

  log.info('NanoClaw running');
}

/** Build ConversationConfig[] for a channel type from the central DB. */
function buildConversationConfigs(channelType: string): ConversationConfig[] {
  const groups = getMessagingGroupsByChannel(channelType);
  const configs: ConversationConfig[] = [];

  for (const mg of groups) {
    const agents = getMessagingGroupAgents(mg.id);
    for (const agent of agents) {
      const triggerRules = agent.trigger_rules ? JSON.parse(agent.trigger_rules) : null;
      configs.push({
        platformId: mg.platform_id,
        agentGroupId: agent.agent_group_id,
        triggerPattern: triggerRules?.pattern,
        requiresTrigger: triggerRules?.requiresTrigger ?? false,
        sessionMode: agent.session_mode,
      });
    }
  }

  return configs;
}

/** Handle a user's response to an ask_user_question card or an approval card. */
async function handleQuestionResponse(questionId: string, selectedOption: string, userId: string): Promise<void> {
  // OneCLI credential approvals — resolved via in-memory Promise, not session DB
  if (resolveOneCLIApproval(questionId, selectedOption)) {
    return;
  }

  // Check if this is a pending approval (install_packages, request_rebuild)
  const approval = getPendingApproval(questionId);
  if (approval) {
    if (approval.action === ONECLI_ACTION) {
      // Row exists but the in-memory resolver is gone (timer fired or process
      // was in a weird state). Nothing to do — just drop the row.
      deletePendingApproval(questionId);
      return;
    }
    await handleApprovalResponse(approval, selectedOption, userId);
    return;
  }

  const pq = getPendingQuestion(questionId);
  if (!pq) {
    log.warn('Pending question not found (may have expired)', { questionId });
    return;
  }

  const session = getSession(pq.session_id);
  if (!session) {
    log.warn('Session not found for pending question', { questionId, sessionId: pq.session_id });
    deletePendingQuestion(questionId);
    return;
  }

  // Write the response to the session DB as a system message
  writeSessionMessage(session.agent_group_id, session.id, {
    id: `qr-${questionId}-${Date.now()}`,
    kind: 'system',
    timestamp: new Date().toISOString(),
    platformId: pq.platform_id,
    channelType: pq.channel_type,
    threadId: pq.thread_id,
    content: JSON.stringify({
      type: 'question_response',
      questionId,
      selectedOption,
      userId,
    }),
  });

  deletePendingQuestion(questionId);
  log.info('Question response routed', { questionId, selectedOption, sessionId: session.id });

  // Wake the container so the MCP tool's poll picks up the response
  await wakeContainer(session);
}

/**
 * Handle an admin's response to an approval card.
 * Fire-and-forget model: the agent doesn't poll for this — we write a chat
 * notification to its session DB, and optionally kill the container so the
 * next wake picks up new config/images.
 */
async function handleApprovalResponse(
  approval: import('./types.js').PendingApproval,
  selectedOption: string,
  userId: string,
): Promise<void> {
  if (!approval.session_id) {
    deletePendingApproval(approval.approval_id);
    return;
  }
  const session = getSession(approval.session_id);
  if (!session) {
    deletePendingApproval(approval.approval_id);
    return;
  }

  const notify = (text: string): void => {
    writeSessionMessage(session.agent_group_id, session.id, {
      id: `appr-note-${Date.now()}-${Math.random().toString(36).slice(2, 8)}`,
      kind: 'chat',
      timestamp: new Date().toISOString(),
      platformId: session.agent_group_id,
      channelType: 'agent',
      threadId: null,
      content: JSON.stringify({ text, sender: 'system', senderId: 'system' }),
    });
  };

  if (selectedOption !== 'approve') {
    notify(`Your ${approval.action} request was rejected by admin.`);
    log.info('Approval rejected', { approvalId: approval.approval_id, action: approval.action, userId });
    deletePendingApproval(approval.approval_id);
    await wakeContainer(session);
    return;
  }

  const payload = JSON.parse(approval.payload);

  if (approval.action === 'install_packages') {
    const agentGroup = getAgentGroup(session.agent_group_id);
    if (!agentGroup) {
      notify('install_packages approved but agent group missing.');
      return;
    }
    updateContainerConfig(agentGroup.folder, (cfg) => {
      if (payload.apt) cfg.packages.apt.push(...(payload.apt as string[]));
      if (payload.npm) cfg.packages.npm.push(...(payload.npm as string[]));
    });

    const pkgs = [...(payload.apt || []), ...(payload.npm || [])].join(', ');
    log.info('Package install approved', { approvalId: approval.approval_id, userId });
    try {
      await buildAgentGroupImage(session.agent_group_id);
      killContainer(session.id, 'rebuild applied');
      // Schedule a follow-up prompt a few seconds after kill so the host sweep
      // respawns the container on the new image and the agent verifies + reports.
      writeSessionMessage(session.agent_group_id, session.id, {
        id: `appr-note-${Date.now()}-${Math.random().toString(36).slice(2, 8)}`,
        kind: 'chat',
        timestamp: new Date().toISOString(),
        platformId: session.agent_group_id,
        channelType: 'agent',
        threadId: null,
        content: JSON.stringify({
          text: `Packages installed (${pkgs}) and container rebuilt. Verify the new packages are available (e.g. run them or check versions) and report the result to the user.`,
          sender: 'system',
          senderId: 'system',
        }),
        processAfter: new Date(Date.now() + 5000)
          .toISOString()
          .replace('T', ' ')
          .replace(/\.\d+Z$/, ''),
      });
      log.info('Container rebuild completed (bundled with install)', { approvalId: approval.approval_id });
    } catch (e) {
      notify(
        `Packages added to config (${pkgs}) but rebuild failed: ${e instanceof Error ? e.message : String(e)}. Call request_rebuild to retry.`,
      );
      log.error('Bundled rebuild failed after install approval', { approvalId: approval.approval_id, err: e });
    }
  } else if (approval.action === 'request_rebuild') {
    try {
      await buildAgentGroupImage(session.agent_group_id);
      // Kill the container so the next wake uses the new image
      killContainer(session.id, 'rebuild applied');
      notify('Container image rebuilt. Your container will restart with the new image on the next message.');
      log.info('Container rebuild approved and completed', { approvalId: approval.approval_id, userId });
    } catch (e) {
      notify(`Rebuild failed: ${e instanceof Error ? e.message : String(e)}`);
      log.error('Container rebuild failed', { approvalId: approval.approval_id, err: e });
    }
  } else if (approval.action === 'add_mcp_server') {
    const agentGroup = getAgentGroup(session.agent_group_id);
    if (!agentGroup) {
      notify('add_mcp_server approved but agent group missing.');
      return;
    }
    updateContainerConfig(agentGroup.folder, (cfg) => {
      cfg.mcpServers[payload.name as string] = {
        command: payload.command as string,
        args: (payload.args as string[]) || [],
        env: (payload.env as Record<string, string>) || {},
      };
    });

    // Kill the container so next wake loads the new MCP server config
    killContainer(session.id, 'mcp server added');
    notify(`MCP server "${payload.name}" added. Your container will restart with it on the next message.`);
    log.info('MCP server add approved', { approvalId: approval.approval_id, userId });
  }

  deletePendingApproval(approval.approval_id);
  await wakeContainer(session);
}

/** Graceful shutdown. */
async function shutdown(signal: string): Promise<void> {
  log.info('Shutdown signal received', { signal });
  stopOneCLIApprovalHandler();
  stopDeliveryPolls();
  stopHostSweep();
  await teardownChannelAdapters();
  process.exit(0);
}

process.on('SIGTERM', () => shutdown('SIGTERM'));
process.on('SIGINT', () => shutdown('SIGINT'));

main().catch((err) => {
  log.fatal('Startup failed', { err });
  process.exit(1);
});