import { describe, expect, test } from 'bun:test'
import { Command } from '@commander-js/extra-typings'

// Test Commander.js option parsing independently from main.tsx initialization.
// main.tsx has heavy bootstrap dependencies; we test the CLI argument parsing
// patterns it uses to ensure correct behavior.

function createTestProgram(): Command {
  const program = new Command()
  program
    .name('claude-code')
    .description('CLI test')
    .exitOverride() // prevent process.exit during tests
    .configureOutput({ writeErr: () => {}, writeOut: () => {} })
    .option('-p, --print', 'pipe mode')
    .option('--resume', 'resume session')
    .option('-v, --verbose', 'verbose output')
    .option('--model <model>', 'model to use')
    .option('--system-prompt <prompt>', 'system prompt')
    .option('--allowedTools <tools...>', 'allowed tools')
    .option('--max-turns <n>', 'max conversation turns', parseInt)
    .version('1.0.0', '-V, --version', 'display version')
  return program
}

describe('CLI arguments: option parsing', () => {
  test('no flags returns empty opts', () => {
    const program = createTestProgram()
    program.parse(['node', 'test'])
    expect(program.opts()).toEqual({})
  })

  test('-p sets print flag', () => {
    const program = createTestProgram()
    program.parse(['node', 'test', '-p'])
    expect(program.opts().print).toBe(true)
  })

  test('--print is equivalent to -p', () => {
    const program = createTestProgram()
    program.parse(['node', 'test', '--print'])
    expect(program.opts().print).toBe(true)
  })

  test('--resume sets resume flag', () => {
    const program = createTestProgram()
    program.parse(['node', 'test', '--resume'])
    expect(program.opts().resume).toBe(true)
  })

  test('-v sets verbose flag', () => {
    const program = createTestProgram()
    program.parse(['node', 'test', '-v'])
    expect(program.opts().verbose).toBe(true)
  })

  test('--model captures string value', () => {
    const program = createTestProgram()
    program.parse(['node', 'test', '--model', 'claude-opus-4-6'])
    expect(program.opts().model).toBe('claude-opus-4-6')
  })

  test('--system-prompt captures string value', () => {
    const program = createTestProgram()
    program.parse(['node', 'test', '--system-prompt', 'Be concise'])
    expect(program.opts().systemPrompt).toBe('Be concise')
  })

  test('--max-turns parses integer value', () => {
    const program = createTestProgram()
    program.parse(['node', 'test', '--max-turns', '10'])
    expect(program.opts().maxTurns).toBe(10)
  })

  test('multiple flags can be combined', () => {
    const program = createTestProgram()
    program.parse(['node', 'test', '-p', '-v', '--model', 'opus'])
    expect(program.opts().print).toBe(true)
    expect(program.opts().verbose).toBe(true)
    expect(program.opts().model).toBe('opus')
  })

  test('--version throws Commander.CommandError with exit code 0', () => {
    const program = createTestProgram()
    let error: any
    try {
      program.parse(['node', 'test', '--version'])
    } catch (e) {
      error = e
    }
    expect(error).toBeDefined()
    expect(error.code).toBe('commander.version')
    expect(error.exitCode).toBe(0)
  })

  test('unknown flags throw CommanderError', () => {
    const program = createTestProgram()
    expect(() => program.parse(['node', 'test', '--nonexistent'])).toThrow()
  })
})