/**
 * CLI Executor for Obsidian commands
 * Constitutional Principle IV: Defensive Programming
 * Uses spawn for better streaming and timeout control
 */

import { spawn } from 'child_process';
import { CLICommand, CLIResult } from '../utils/types.js';
import { logger } from '../utils/logger.js';
import { getCommandTimeout } from '../config/timeouts.js';

/**
 * Execute an Obsidian CLI command with timeout
 */
export async function executeCommand(cmd: CLICommand): Promise<CLIResult> {
  const timeout = cmd.timeout || getCommandTimeout(cmd.command);
  logger.debug('Executing CLI command', {
    command: cmd.command,
    argCount: cmd.args.length,
    timeout,
  });

  return new Promise((resolve) => {
    const child = spawn(cmd.command, cmd.args, {
      cwd: cmd.cwd || process.cwd(),
      shell: true,
    });

    let stdout = '';
    let stderr = '';
    let timedOut = false;

    // Set timeout
    const timeoutId = setTimeout(() => {
      timedOut = true;
      child.kill('SIGTERM');
      logger.warn('CLI command timed out', {
        command: cmd.command,
        timeout,
      });
    }, timeout);

    // Collect stdout
    child.stdout?.on('data', (data) => {
      stdout += data.toString();
    });

    // Collect stderr
    child.stderr?.on('data', (data) => {
      stderr += data.toString();
    });

    // Handle completion
    child.on('close', (code) => {
      clearTimeout(timeoutId);

      const result: CLIResult = {
        stdout: stdout.trim(),
        stderr: stderr.trim(),
        exitCode: code || 0,
        timedOut,
      };

      if (result.exitCode === 0) {
        logger.debug('CLI command succeeded', {
          command: cmd.command,
          outputLength: result.stdout.length,
        });
      } else {
        logger.warn('CLI command failed', {
          command: cmd.command,
          exitCode: result.exitCode,
          timedOut: result.timedOut,
        });
      }

      resolve(result);
    });

    // Handle spawn errors
    child.on('error', (error) => {
      clearTimeout(timeoutId);
      logger.error('CLI command spawn error', { error: error.message });

      resolve({
        stdout: '',
        stderr: error.message,
        exitCode: 1,
        timedOut: false,
      });
    });
  });
}

/**
 * Execute Obsidian CLI command with vault context
 */
export async function executeObsidianCommand(
  subcommand: string,
  args: string[] = [],
  options?: { timeout?: number }
): Promise<CLIResult> {
  const vaultName = process.env.OBSIDIAN_VAULT;

  if (!vaultName) {
    throw new Error('OBSIDIAN_VAULT environment variable not set');
  }

  // Build full command: obsidian <subcommand> --vault <vault_name> <args>
  const fullArgs = [subcommand, '--vault', vaultName, ...args];

  return executeCommand({
    command: '/Applications/Obsidian.app/Contents/MacOS/obsidian',
    args: fullArgs,
    timeout: options?.timeout,
  });
}