#!/usr/bin/env bun
import minimist from "minimist";
import os from "os";
import path from "path";

import compose from "./src/compose";
import generateDockerfile from "./src/docker-file";
import frp from "./src/frp";
import { generateEnvTypes } from "./src/generate/env.generate";
import checkPort from "./src/port";
import route from "./src/route";

import { version } from '../package.json' assert { type: 'json' };
import appCreate from "./src/app-create";


interface CheckPortResult {
  port: number;
  open: boolean;
}

// Default constants (12-Factor App)
const DEFAULTS = {
  ENV_FILE: ".env",
  ENV_OUT: "types/env.d.ts",
  PORT_START: 3000,
  PORT_END: 4000,
  HOST: "127.0.0.1",
};

// CLI Help
const HELP_TEXT = `
g3n [command] [options]

Commands:
  env          Generate env.d.ts from .env file
  scan-port    Scan port range (default 3000-4000)
  route        Generate routes.ts from AppRoutes.tsx
  compose      Generate compose.yml from name
  docker-file  Generate Dockerfile
  frp          Show frp proxy list
  app-create   Generate app with Elysia and React

Options:
  --env    Path ke file .env (default: .env)
  --out    Path file output (default: types/env.d.ts)
  --start  Port awal scan (default: 3000)
  --end    Port akhir scan (default: 4000)
  --host   Host/IP target (default: 127.0.0.1)

Examples:
  g3n env --env .env.local --out src/types/env.d.ts
  g3n scan-port --start 7700 --end 7800 --host 127.0.0.1
  g3n route
  g3n compose <name>
  g3n docker-file
  g3n frp
  g3n app-create <name>

Version: ${version}
`;

const g3nConf = path.join(os.homedir(), ".g3n.conf");

if (!(await Bun.file(g3nConf).exists())) {
  const conf = `
  # CODE
  CODE_TOKEN=

  # FRP
  FRP_HOST=
  FRP_USER=
  FRP_SECRET=
  `
  Bun.write(g3nConf, conf);
  console.log(`✅ G3N config created at ${g3nConf}`);
}


// Parse CLI arguments
const args = minimist(process.argv.slice(2));

/**
 * Main CLI handler
 */
async function main(): Promise<void> {
  const [command, name] = args._;

  switch (command) {
    case "env":
      handleEnv();
      break;

    case "scan-port":
      await handleScanPort();
      break;

    case "route":
      route();
      break;

    case "compose":
      handleCompose(name);
      break;

    case "docker-file":
      generateDockerfile();
      break;
    case "frp":
      frp().catch((err) => {
        console.error("❌ Error:", err);
        process.exit(1);
      });
      break;
    case "app-create":
      if (!name) {
        console.error("❌ App name is required");
        return;
      }
      appCreate({ appName: name });
      break;

    default:
      console.error(HELP_TEXT);
      break;
  }
}

/**
 * Handle "env" command
 */
function handleEnv(): void {
  const envFile = args.env || DEFAULTS.ENV_FILE;
  const output = args.out || DEFAULTS.ENV_OUT;

  generateEnvTypes({
    envFilePath: envFile,
    outputDir: path.dirname(output),
    outputFileName: path.basename(output),
  });

  console.log(`✅ Env types generated at ${output}`);
}

/**
 * Handle "scan-port" command
 */
async function handleScanPort(): Promise<void> {
  const start = Number(args.start) || DEFAULTS.PORT_START;
  const end = Number(args.end) || DEFAULTS.PORT_END;
  const host = args.host || DEFAULTS.HOST;

  console.log(`🔍 Scanning ports ${start}-${end} on host ${host}...`);

  const ports = Array.from({ length: end - start + 1 }, (_, i) => start + i);

  const results: CheckPortResult[] = await Promise.all(
    ports.map((port) => checkPort(port, host))
  );

  const openPorts = results.filter((r) => r.open);
  openPorts.forEach((r) => console.log(`✅ Port ${r.port} is open`));

  console.log("✅ Scan completed");
}

/**
 * Handle "compose" command
 */
function handleCompose(name?: string): void {
  if (!name) {
    console.error("❌ Compose name is required");
    return;
  }

  if (!args.env) {
    console.error("❌ Compose env (staging/prod) is required");
    return;
  }

  if (args.env !== "staging" && args.env !== "prod") {
    console.error("❌ Compose env (staging/prod) is required");
    return;
  }

  if (!args.port) {
    console.error("❌ Compose port is required");
    return;
  }

  if(args.port.length !== 2) {
    console.error("❌ Compose port must be 2 digits");
    return;
  }

  compose(name, args.env, Number(args.port));
  console.log(`✅ Compose file generated for ${name}`);
}

// Execute CLI
main().catch((err) => {
  console.error("❌ Unexpected error:", err);
  process.exit(1);
});