import * as path from 'path';
import * as plugins from '../plugins.js';
import { CargoConfig } from '../mod_cargo/index.js';
import { CargoRunner } from '../mod_cargo/index.js';
import { FsHelpers } from '../mod_fs/index.js';

export class TsRustCli {
  private cli: plugins.smartcli.Smartcli;
  private cwd: string;

  constructor(cwd: string = process.cwd()) {
    this.cwd = cwd;
    this.cli = new plugins.smartcli.Smartcli();
    this.registerCommands();
  }

  private registerCommands(): void {
    this.registerStandardCommand();
    this.registerCleanCommand();
  }

  private registerStandardCommand(): void {
    this.cli.standardCommand().subscribe(async (argvArg) => {
      const startTime = Date.now();

      // Check cargo is installed
      const runner = new CargoRunner(this.cwd); // temporary, just for version check
      if (!(await runner.checkCargoInstalled())) {
        console.error('Error: cargo is not installed or not in PATH.');
        console.error('Install Rust via https://rustup.rs/');
        process.exit(1);
      }

      const cargoVersion = await runner.getCargoVersion();
      console.log(`Using ${cargoVersion}`);

      // Detect rust directory
      const rustDir = await this.detectRustDir();
      if (!rustDir) {
        console.error('Error: No rust/ or ts_rust/ directory found with a Cargo.toml.');
        process.exit(1);
      }

      console.log(`Found Rust project at: ${path.relative(this.cwd, rustDir) || '.'}`);

      // Parse Cargo.toml
      const cargoConfig = new CargoConfig(rustDir);
      const workspaceInfo = await cargoConfig.parse();

      if (workspaceInfo.isWorkspace) {
        console.log('Detected Cargo workspace');
      }

      if (workspaceInfo.binTargets.length === 0) {
        console.error('Error: No binary targets found in Cargo.toml.');
        process.exit(1);
      }

      console.log(`Binary targets: ${workspaceInfo.binTargets.join(', ')}`);

      // Build
      const isDebug = !!(argvArg as any).debug;
      const shouldClean = !!(argvArg as any).clean;
      const cargoRunner = new CargoRunner(rustDir);
      const buildResult = await cargoRunner.build({ debug: isDebug, clean: shouldClean });

      if (!buildResult.success) {
        console.error(`Build failed with exit code ${buildResult.exitCode}`);
        process.exit(1);
      }

      // Copy binaries to dist_rust/
      const profile = isDebug ? 'debug' : 'release';
      const targetDir = path.join(rustDir, 'target', profile);
      const distDir = path.join(this.cwd, 'dist_rust');

      await FsHelpers.ensureEmptyDir(distDir);

      for (const binName of workspaceInfo.binTargets) {
        const srcBinary = path.join(targetDir, binName);
        const destBinary = path.join(distDir, binName);

        if (!(await FsHelpers.fileExists(srcBinary))) {
          console.warn(`Warning: Expected binary not found: ${srcBinary}`);
          continue;
        }

        await FsHelpers.copyFile(srcBinary, destBinary);
        await FsHelpers.makeExecutable(destBinary);

        const size = await FsHelpers.getFileSize(destBinary);
        console.log(`Copied ${binName} (${FsHelpers.formatFileSize(size)}) -> dist_rust/${binName}`);
      }

      const elapsed = ((Date.now() - startTime) / 1000).toFixed(1);
      console.log(`Done in ${elapsed}s`);
    });
  }

  private registerCleanCommand(): void {
    this.cli.addCommand('clean').subscribe(async (_argvArg) => {
      // Clean cargo build
      const rustDir = await this.detectRustDir();
      if (rustDir) {
        console.log('Running cargo clean...');
        const runner = new CargoRunner(rustDir);
        await runner.clean();
        console.log('Cargo clean complete.');
      }

      // Remove dist_rust/
      const distDir = path.join(this.cwd, 'dist_rust');
      if (await FsHelpers.directoryExists(distDir)) {
        await FsHelpers.removeDirectory(distDir);
        console.log('Removed dist_rust/');
      }

      console.log('Clean complete.');
    });
  }

  private async detectRustDir(): Promise<string | null> {
    // Check rust/ first
    const rustDir = path.join(this.cwd, 'rust');
    if (await FsHelpers.fileExists(path.join(rustDir, 'Cargo.toml'))) {
      return rustDir;
    }

    // Fallback to ts_rust/
    const tsRustDir = path.join(this.cwd, 'ts_rust');
    if (await FsHelpers.fileExists(path.join(tsRustDir, 'Cargo.toml'))) {
      return tsRustDir;
    }

    return null;
  }

  public run(): void {
    this.cli.startParse();
  }
}

export const runCli = async (): Promise<void> => {
  const cli = new TsRustCli();
  cli.run();
};