import { useEffect, useCallback } from 'react'

interface ShortcutConfig {
  key: string
  ctrl?: boolean
  shift?: boolean
  alt?: boolean
  handler: () => void
  enabled?: boolean
}

export function useKeyboardShortcuts(shortcuts: ShortcutConfig[]) {
  const handleKeyDown = useCallback(
    (e: KeyboardEvent) => {
      // Don't trigger shortcuts when typing in inputs
      const target = e.target as HTMLElement
      if (
        target.tagName === 'INPUT' ||
        target.tagName === 'TEXTAREA' ||
        target.isContentEditable
      ) {
        return
      }

      for (const shortcut of shortcuts) {
        if (shortcut.enabled === false) continue

        const keyMatch = e.key === shortcut.key || e.key === shortcut.key.toLowerCase()
        const ctrlMatch = !!shortcut.ctrl === (e.ctrlKey || e.metaKey)
        const shiftMatch = !!shortcut.shift === e.shiftKey
        const altMatch = !!shortcut.alt === e.altKey

        if (keyMatch && ctrlMatch && shiftMatch && altMatch) {
          e.preventDefault()
          shortcut.handler()
          return
        }
      }
    },
    [shortcuts]
  )

  useEffect(() => {
    document.addEventListener('keydown', handleKeyDown)
    return () => document.removeEventListener('keydown', handleKeyDown)
  }, [handleKeyDown])
}

// Convenience hook for tree navigation specifically
export interface TreeNavigationShortcutsConfig {
  onSelectOption: (index: number) => void
  onGoBack: () => void
  onContinue: () => void
  optionCount: number
  canGoBack: boolean
  canContinue: boolean
}

export function useTreeNavigationShortcuts({
  onSelectOption,
  onGoBack,
  onContinue,
  optionCount,
  canGoBack,
  canContinue,
}: TreeNavigationShortcutsConfig) {
  const shortcuts: ShortcutConfig[] = [
    // Number keys 1-9 for options
    ...Array.from({ length: Math.min(optionCount, 9) }, (_, i) => ({
      key: String(i + 1),
      handler: () => onSelectOption(i),
    })),
    // Escape to go back
    {
      key: 'Escape',
      handler: onGoBack,
      enabled: canGoBack,
    },
    // Enter to continue (for action nodes)
    {
      key: 'Enter',
      handler: onContinue,
      enabled: canContinue,
    },
    // Tab to focus notes
    {
      key: 'Tab',
      handler: () => {
        document.getElementById('session-notes')?.focus()
      },
    },
  ]

  useKeyboardShortcuts(shortcuts)
}

export default useKeyboardShortcuts