/**
 * DoctorCommand - Diagnostic and repair command
 * DD §17. doctor [--fix|--bundle].
 *
 * @module packages/cli/src/commands/doctor
 */

import { loadConfig } from '../bootstrap/loadConfig.js'
import { DoctorService } from '@aircoding/runtime'
import { createInterface } from 'readline'

async function ask_user(prompt: string): Promise<boolean> {
  const rl = createInterface({ input: process.stdin, output: process.stdout })
  return new Promise((resolve) => {
    rl.question(prompt, (answer) => {
      rl.close()
      resolve(answer.toLowerCase().startsWith('y'))
    })
  })
}

export async function doctorCommand(options: { fix?: boolean; bundle?: boolean; scope?: string }): Promise<void> {
  const config = loadConfig()
  const project_root = config.project_root || process.cwd()
  const doctor = new DoctorService(project_root)

  console.log('Running diagnostics...\n')

  const report = await doctor.run_diagnostics(options.scope as any || 'all')

  // Group checks by category for clean output
  const categories = new Map<string, Array<typeof report.checks[0]>>()
  for (const check of report.checks) {
    const cat = categories.get(check.category) || []
    cat.push(check)
    categories.set(check.category, cat)
  }

  for (const [category, checks] of categories) {
    console.log(`  [${category}]`)
    for (const check of checks) {
      const icon = check.passed ? '✅' : '❌'
      const fixHint = check.fixable ? ` → fix: ${check.fix || 'manual'}` : ''
      console.log(`    ${icon} ${check.name}: ${check.message}${fixHint}`)
    }
  }

  console.log(`\nBootstrap: ${report.bootstrap_passed ? '✅ PASS' : '❌ FAIL'}`)
  console.log(`All checks: ${report.all_passed ? '✅ PASS' : '❌ FAIL'}`)
  console.log(`Fixable:   ${report.fixable_count} issues`)

  if (options.fix) {
    const fixable = report.checks.filter(c => !c.passed && c.fixable)
    if (fixable.length === 0) {
      console.log('\nNothing to fix.')
      return
    }

    console.log(`\n${fixable.length} fixable issue(s) found:`)
    for (const check of fixable) {
      console.log(`  - ${check.name}: ${check.fix || 'manual fix required'}`)
    }

    // Permissioned fix mode: ask user before each fix (§6.12)
    const approved = await ask_user(`\nApply these fixes? This may install system packages. [y/N] `)
    if (!approved) {
      console.log('Fix cancelled.')
      return
    }

    console.log('\nApplying fixes...')
    for (const check of fixable) {
      const result = await doctor.fix(check.name)
      const icon = result.ok ? '✅' : '❌'
      console.log(`  ${icon} ${check.name}: ${result.message}`)
    }

    // Re-run diagnostics to show updated state
    console.log('\nRe-running diagnostics...\n')
    const updated = await doctor.run_diagnostics(options.scope as any || 'all')
    for (const check of updated.checks.filter(c => !c.passed)) {
      console.log(`  ❌ ${check.name}: ${check.message}`)
    }
    if (updated.all_passed) {
      console.log('  ✅ All checks passed after fix!')
    }
    console.log(`\nUpdated: ${updated.all_passed ? '✅ PASS' : '❌ FAIL'}`)
  }

  if (options.bundle) {
    console.log('\nBundle feature not yet implemented (P8)')
  }
}