#!/usr/bin/env tsx
/**
 * Golf Soak Harness — entry point.
 *
 * Usage:
 *   TEST_URL=http://localhost:8000 \
 *   SOAK_INVITE_CODE=SOAKTEST \
 *     bun run soak -- --scenario=populate --rooms=1 --accounts=2 \
 *       --cpus-per-room=0 --games-per-room=1 --holes=1 --watch=none
 */

import * as path from 'path';
import { spawn } from 'child_process';
import { parseArgs, mergeConfig, CliArgs } from './config';
import { createLogger } from './core/logger';
import { SessionPool } from './core/session-pool';
import { RoomCoordinator } from './core/room-coordinator';
import { DashboardServer } from './dashboard/server';
import { Screencaster } from './core/screencaster';
import { getScenario, listScenarios } from './scenarios';
import type { DashboardReporter, ScenarioContext, Session } from './core/types';

function noopDashboard(): DashboardReporter {
  return {
    update: () => {},
    log: () => {},
    incrementMetric: () => {},
  };
}

function printScenarioList(): void {
  console.log('Available scenarios:');
  for (const s of listScenarios()) {
    console.log(`  ${s.name.padEnd(12)} ${s.description}`);
    console.log(
      `    needs: accounts=${s.needs.accounts}, rooms=${s.needs.rooms ?? 1}, cpus=${s.needs.cpusPerRoom ?? 0}`,
    );
  }
}

async function main(): Promise<void> {
  const cli: CliArgs = parseArgs(process.argv.slice(2));

  if (cli.listOnly) {
    printScenarioList();
    return;
  }

  if (!cli.scenario) {
    console.error('Error: --scenario=<name> is required. Use --list to see scenarios.');
    process.exit(2);
  }

  const scenario = getScenario(cli.scenario);
  if (!scenario) {
    console.error(`Error: unknown scenario "${cli.scenario}". Use --list to see scenarios.`);
    process.exit(2);
  }

  const runId =
    cli.runId ?? `${cli.scenario}-${new Date().toISOString().replace(/[:.]/g, '-')}`;
  const targetUrl = cli.target ?? process.env.TEST_URL ?? 'http://localhost:8000';
  const inviteCode = process.env.SOAK_INVITE_CODE ?? 'SOAKTEST';
  const watch = cli.watch ?? 'dashboard';

  const logger = createLogger({ runId });
  logger.info('run_start', {
    scenario: scenario.name,
    targetUrl,
    watch,
    cli,
  });

  // Resolve final config: scenarioDefaults → env → CLI (later wins)
  const config = mergeConfig(
    cli as Record<string, unknown>,
    process.env,
    scenario.defaultConfig,
  );

  // Ensure core knobs exist, falling back to scenario.needs
  const accounts = Number(config.accounts ?? scenario.needs.accounts);
  const rooms = Number(config.rooms ?? scenario.needs.rooms ?? 1);
  const cpusPerRoom = Number(config.cpusPerRoom ?? scenario.needs.cpusPerRoom ?? 0);
  if (accounts % rooms !== 0) {
    console.error(
      `Error: --accounts=${accounts} does not divide evenly into --rooms=${rooms}`,
    );
    process.exit(2);
  }
  config.accounts = accounts;
  config.rooms = rooms;
  config.cpusPerRoom = cpusPerRoom;

  if (cli.dryRun) {
    logger.info('dry_run', { config });
    console.log('Dry run OK. Resolved config:');
    console.log(JSON.stringify(config, null, 2));
    return;
  }

  // Build dependencies
  const credFile = path.resolve(__dirname, '.env.stresstest');
  const headedHostCount = watch === 'tiled' ? rooms : 0;
  const pool = new SessionPool({
    targetUrl,
    inviteCode,
    credFile,
    logger,
    headedHostCount,
  });
  const coordinator = new RoomCoordinator();
  const screencaster = new Screencaster(logger);

  const abortController = new AbortController();

  const onSignal = (sig: string) => {
    logger.warn('signal_received', { signal: sig });
    abortController.abort();
  };
  process.on('SIGINT', () => onSignal('SIGINT'));
  process.on('SIGTERM', () => onSignal('SIGTERM'));

  let dashboardServer: DashboardServer | null = null;
  let dashboard: DashboardReporter = noopDashboard();
  let exitCode = 0;
  try {
    const sessions = await pool.acquire(accounts);
    logger.info('sessions_acquired', { count: sessions.length });

    // Build a session lookup for click-to-watch
    const sessionsByKey = new Map<string, Session>();
    for (const s of sessions) sessionsByKey.set(s.key, s);

    // Dashboard with screencaster handlers now that sessions exist
    if (watch === 'dashboard') {
      const port = Number(config.dashboardPort ?? 7777);
      dashboardServer = new DashboardServer(port, logger, {
        onStartStream: (key) => {
          const session = sessionsByKey.get(key);
          if (!session) {
            logger.warn('stream_start_unknown_session', { sessionKey: key });
            return;
          }
          screencaster
            .start(key, session.page, (jpegBase64) => {
              dashboardServer!.broadcast({ type: 'frame', sessionKey: key, jpegBase64 });
            })
            .catch((err) =>
              logger.error('screencast_start_failed', {
                sessionKey: key,
                error: err instanceof Error ? err.message : String(err),
              }),
            );
        },
        onStopStream: (key) => {
          screencaster.stop(key).catch(() => {
            // best-effort — errors already logged inside Screencaster
          });
        },
        onDisconnect: () => {
          screencaster.stopAll().catch(() => {});
        },
      });
      await dashboardServer.start();
      dashboard = dashboardServer.reporter();
      const url = `http://localhost:${port}`;
      console.log(`Dashboard: ${url}`);
      try {
        const opener =
          process.platform === 'darwin'
            ? 'open'
            : process.platform === 'win32'
              ? 'start'
              : 'xdg-open';
        spawn(opener, [url], { stdio: 'ignore', detached: true }).unref();
      } catch {
        // If auto-open fails, the URL is already printed.
      }
    }

    const ctx: ScenarioContext = {
      config,
      sessions,
      coordinator,
      dashboard,
      logger,
      signal: abortController.signal,
      heartbeat: () => {
        // Task 26 wires per-room watchdogs. No-op until then.
      },
    };

    const result = await scenario.run(ctx);
    logger.info('run_complete', {
      gamesCompleted: result.gamesCompleted,
      errors: result.errors.length,
      durationMs: result.durationMs,
    });
    console.log(`Games completed: ${result.gamesCompleted}`);
    console.log(`Errors:          ${result.errors.length}`);
    console.log(`Duration:        ${(result.durationMs / 1000).toFixed(1)}s`);
    if (result.errors.length > 0) {
      console.log('Errors:');
      for (const e of result.errors) {
        console.log(`  ${e.room}: ${e.reason}${e.detail ? ' — ' + e.detail : ''}`);
      }
      exitCode = 1;
    }
  } catch (err) {
    logger.error('run_failed', {
      error: err instanceof Error ? err.message : String(err),
      stack: err instanceof Error ? err.stack : undefined,
    });
    exitCode = 1;
  } finally {
    await screencaster.stopAll();
    await pool.release();
    if (dashboardServer) {
      await dashboardServer.stop();
    }
  }

  if (abortController.signal.aborted && exitCode === 0) exitCode = 2;
  process.exit(exitCode);
}

main().catch((err) => {
  console.error(err);
  process.exit(1);
});