import fs from 'node:fs';
import path from 'node:path';
import {
  decryptBin,
  listInterfaces,
  parseWorldXml,
  startCapture,
  WORLD_BIN_SUBPATH,
  type AlbionOrder,
} from '@albion/shared';
import { ServerClient } from './api.js';
import { loadConfig, saveConfig, configPath, type AgentConfig } from './config.js';

/**
 * Albion companion agent — runs on the gaming PC. It reads game-local data that
 * a deployed server can't see and pushes it to the server:
 *   - world map (one-shot, from the game's world.bin)
 *   - live market orders (passive capture while you play)
 * Read-only. No memory reading, no injection, no automation.
 *
 * Usage:
 *   npm run agent -- interfaces      list capture interfaces
 *   npm run agent -- world           parse + upload the world map, then exit
 *   npm run agent -- run             upload world map, then stream market orders (default)
 *   npm run agent -- init            write a starter config file
 */

function resolveWorldBin(gamePath: string): string | null {
  const direct = path.join(gamePath, WORLD_BIN_SUBPATH);
  if (fs.existsSync(direct)) return direct;
  if (gamePath.endsWith('world.bin') && fs.existsSync(gamePath)) return gamePath;
  return null;
}

async function uploadWorld(client: ServerClient, cfg: AgentConfig): Promise<void> {
  const binPath = resolveWorldBin(cfg.gamePath);
  if (!binPath) {
    console.error(`world.bin not found under "${cfg.gamePath}". Set gamePath in ${configPath()}.`);
    return;
  }
  const xml = decryptBin(fs.readFileSync(binPath)).toString('utf8');
  const world = parseWorldXml(xml);
  const res = await client.sendWorld(world);
  console.log(`Uploaded world map: ${res.zones} zones, ${res.connections} connections.`);
}

function streamOrders(client: ServerClient, cfg: AgentConfig): void {
  let buffer: AlbionOrder[] = [];
  let packets = 0;
  let sent = 0;

  const capture = startCapture(
    {
      onPacket: () => {
        packets++;
      },
      onOrders: (orders) => {
        buffer.push(...orders);
      },
      onError: (message) => console.error('capture:', message),
    },
    cfg.interfaces,
  );

  if ('error' in capture) {
    console.error(capture.error);
    process.exit(1);
  }

  const flush = async () => {
    if (buffer.length === 0) return;
    const batch = buffer;
    buffer = [];
    try {
      const res = await client.sendOrders(batch);
      sent += res.pricesStored ?? 0;
      console.log(`[${new Date().toLocaleTimeString()}] sent ${batch.length} orders (${res.pricesStored} prices) · ${packets} packets seen · ${sent} prices total`);
    } catch (e) {
      buffer.unshift(...batch); // retry next tick
      console.error('upload failed (will retry):', e instanceof Error ? e.message : e);
    }
  };

  const timer = setInterval(() => void flush(), Math.max(5, cfg.orderFlushSeconds) * 1000);
  timer.unref?.();

  console.log('Capturing market orders — open a marketplace in game to record prices. Ctrl+C to stop.');
  const shutdown = () => {
    clearInterval(timer);
    capture.stop();
    void flush().finally(() => process.exit(0));
  };
  process.on('SIGINT', shutdown);
  process.on('SIGTERM', shutdown);
}

async function main(): Promise<void> {
  const command = process.argv[2] ?? 'run';
  const cfg = loadConfig();

  if (command === 'init') {
    saveConfig(cfg);
    console.log(`Wrote config to ${configPath()}. Edit serverUrl, apiKey and gamePath, then run: npm run agent`);
    return;
  }

  if (command === 'interfaces') {
    const ifaces = listInterfaces();
    if (ifaces.length === 0) {
      console.error('No interfaces found. Is Wireshark/tshark installed?');
      return;
    }
    for (const i of ifaces) console.log(`${i.id}\t${i.name}`);
    console.log('\nAdd the ids you want to "interfaces" in your config, or leave empty for all.');
    return;
  }

  const client = new ServerClient(cfg);
  console.log(`Server: ${cfg.serverUrl}`);
  try {
    await client.ping();
    console.log('Server reachable.');
  } catch (e) {
    console.error(`Cannot reach server at ${cfg.serverUrl}:`, e instanceof Error ? e.message : e);
    process.exit(1);
  }

  if (command === 'world') {
    await uploadWorld(client, cfg);
    return;
  }

  if (command === 'run') {
    await uploadWorld(client, cfg).catch((e) => console.error('world upload failed:', e instanceof Error ? e.message : e));
    streamOrders(client, cfg);
    return;
  }

  console.error(`Unknown command: ${command}. Use: init | interfaces | world | run`);
  process.exit(1);
}

void main();