#!/usr/bin/env node
// Claude Desktop — Bridge via Claude Agent SDK
//
// Nutzt @anthropic-ai/claude-agent-sdk (query-Funktion)
// OAuth-Auth funktioniert automatisch (Claude Max Abo)
// Kein CLI-Spawn, kein Overhead — direkte SDK-Aufrufe

import { query } from '@anthropic-ai/claude-agent-sdk';
import { createInterface } from 'node:readline';
import { randomUUID } from 'node:crypto';

// Prozess am Leben halten
const keepAlive = setInterval(() => {}, 60000);
process.stdin.resume();

// ============ State ============

let activeAbort = null;
let currentAgentId = null;
let currentModel = process.env.CLAUDE_MODEL || 'opus';

// Verfügbare Modelle
const AVAILABLE_MODELS = [
  { id: 'haiku', name: 'Claude Haiku', description: 'Schnell & günstig' },
  { id: 'sonnet', name: 'Claude Sonnet', description: 'Ausgewogen' },
  { id: 'opus', name: 'Claude Opus', description: 'Leistungsstark' },
];

// ============ Kommunikation mit Tauri ============

function sendToTauri(msg) {
  process.stdout.write(JSON.stringify(msg) + '\n');
}

function sendEvent(event, payload = {}) {
  sendToTauri({ type: 'event', event, payload });
}

function sendResponse(id, result) {
  sendToTauri({ type: 'response', id, result });
}

function sendError(id, error) {
  sendToTauri({ type: 'response', id, error });
}

// ============ Claude Agent SDK ============

async function sendMessage(message, requestId, model = null) {
  // Modell für diese Anfrage (Parameter > State > Default)
  const useModel = model || currentModel;

  currentAgentId = randomUUID();
  activeAbort = new AbortController();

  sendEvent('agent-started', {
    id: currentAgentId,
    type: 'Main',
    task: message.substring(0, 100),
    model: useModel,
  });

  sendResponse(requestId, { agentId: currentAgentId, status: 'gestartet', model: useModel });

  const startTime = Date.now();
  let fullText = '';
  let usedModel = useModel;

  try {
    const conversation = query({
      prompt: message,
      options: {
        model: useModel,
        maxTurns: 25,
        abortController: activeAbort,
      },
    });

    for await (const event of conversation) {
      switch (event.type) {
        case 'assistant':
          // Text aus der Nachricht extrahieren
          if (event.message?.content) {
            for (const block of event.message.content) {
              if (block.type === 'text' && block.text) {
                fullText += block.text;
                sendEvent('text', { text: block.text });
              }
            }
          }
          if (event.message?.model) {
            usedModel = event.message.model;
          }
          break;

        case 'tool_use':
          sendEvent('tool-start', {
            id: event.tool_use_id || randomUUID(),
            tool: event.name || 'unknown',
            input: event.input || {},
          });
          break;

        case 'tool_result':
          sendEvent('tool-end', {
            id: event.tool_use_id || '',
            success: !event.is_error,
          });
          break;

        case 'result':
          // Endergebnis
          sendEvent('result', {
            text: fullText,
            cost: event.total_cost_usd || 0,
            tokens: {
              input: event.usage?.input_tokens || 0,
              output: event.usage?.output_tokens || 0,
            },
            session_id: event.session_id || '',
            duration_ms: Date.now() - startTime,
            model: usedModel,
          });
          break;

        default:
          // Andere Events still ignorieren
          break;
      }
    }
  } catch (err) {
    if (err.name === 'AbortError') {
      // Abgebrochen — kein Fehler
    } else {
      sendEvent('text', { text: `\n\n**Fehler:** ${err.message || err}` });
    }
  } finally {
    sendEvent('agent-stopped', { id: currentAgentId, code: 0 });
    sendEvent('all-stopped');
    currentAgentId = null;
    activeAbort = null;
  }
}

// ============ Befehle von Tauri ============

function handleCommand(msg) {
  switch (msg.command) {
    case 'message':
      if (!msg.message) {
        sendError(msg.id, 'Keine Nachricht angegeben');
        return;
      }
      // Modell kann pro Anfrage überschrieben werden
      sendMessage(msg.message, msg.id, msg.model);
      break;

    case 'stop':
      if (activeAbort) {
        activeAbort.abort();
      }
      sendResponse(msg.id, { status: 'gestoppt' });
      break;

    case 'set-model':
      if (!msg.model) {
        sendError(msg.id, 'Kein Modell angegeben');
        return;
      }
      const validModels = AVAILABLE_MODELS.map(m => m.id);
      if (!validModels.includes(msg.model)) {
        sendError(msg.id, `Ungültiges Modell: ${msg.model}. Verfügbar: ${validModels.join(', ')}`);
        return;
      }
      currentModel = msg.model;
      sendResponse(msg.id, { model: currentModel, status: 'Modell geändert' });
      sendEvent('model-changed', { model: currentModel });
      break;

    case 'get-models':
      sendResponse(msg.id, {
        current: currentModel,
        available: AVAILABLE_MODELS,
      });
      break;

    case 'status':
      sendResponse(msg.id, {
        model: currentModel,
        isProcessing: !!currentAgentId,
        availableModels: AVAILABLE_MODELS,
      });
      break;

    case 'ping':
      sendResponse(msg.id, { pong: true });
      break;

    default:
      sendError(msg.id, `Unbekannter Befehl: ${msg.command}`);
  }
}

// ============ Main ============

const rl = createInterface({ input: process.stdin });
rl.on('line', (line) => {
  if (!line.trim()) return;
  try {
    handleCommand(JSON.parse(line));
  } catch (err) {
    process.stderr.write(`Ungültige Eingabe: ${err.message}\n`);
  }
});

rl.on('close', () => {
  process.stderr.write('stdin geschlossen\n');
});

process.on('SIGTERM', () => { clearInterval(keepAlive); process.exit(0); });
process.on('SIGINT', () => { clearInterval(keepAlive); process.exit(0); });

// Bereit
sendEvent('ready', { version: '1.1.0', pid: process.pid, model: currentModel, availableModels: AVAILABLE_MODELS });