/**
 * Modal 组件
 * 
 * 统一的弹窗组件，遵循三层架构设计
 * 支持多种尺寸（small、medium、large、xlarge、fullscreen）
 * 支持ESC键关闭、点击遮罩关闭、键盘导航
 * 完整的ARIA标签支持，确保可访问性
 * 
 * @created 2025-11-22
 * @component
 */

'use client'

import { useEffect, useRef, ReactNode, CSSProperties, useState } from 'react'
import { createPortal } from 'react-dom'
import { useThemeStyles, cn } from '@/lib/ui-styles'

export type ModalSize = 'xs' | 'small' | 'medium' | 'large' | 'xlarge' | 'xxlarge' | 'fullscreen'

const MODAL_BORDER_RADIUS = 32

const sizeStyleMap: Record<ModalSize, CSSProperties> = {
  xs: { width: 'min(90vw, 20rem)', maxWidth: '20rem' },
  small: { width: 'min(92vw, 24rem)', maxWidth: '24rem' },
  medium: { width: 'min(94vw, 32rem)', maxWidth: '32rem' },
  large: { width: 'min(95vw, 40rem)', maxWidth: '40rem' },
  xlarge: { width: 'min(96vw, 60rem)', maxWidth: '60rem' },
  xxlarge: { width: 'min(98vw, 80rem)', maxWidth: '80rem' },
  fullscreen: {
    width: '100vw',
    height: '100vh',
    maxWidth: '100vw',
    maxHeight: '100vh',
  },
}

interface ModalProps {
  isOpen: boolean
  onClose: () => void
  title?: string
  children: ReactNode
  size?: ModalSize
  showCloseButton?: boolean
  closeOnOverlayClick?: boolean
  closeOnEscape?: boolean
  footer?: ReactNode
  className?: string
  containerClassName?: string
  containerStyle?: CSSProperties
  contentClassName?: string
  bodyClassName?: string
  bodyStyle?: CSSProperties
}

export default function Modal({
  isOpen,
  onClose,
  title,
  children,
  size = 'medium',
  showCloseButton = true,
  closeOnOverlayClick = true,
  closeOnEscape = true,
  footer,
  className = '',
  containerClassName = '',
  containerStyle,
  contentClassName = '',
  bodyClassName = '',
  bodyStyle,
}: ModalProps) {
  const [isMounted, setIsMounted] = useState(false)
  const styles = useThemeStyles()
  const modalRef = useRef<HTMLDivElement>(null)
  const shouldCloseRef = useRef(false)

  // ESC键关闭
  useEffect(() => {
    if (!isOpen || !closeOnEscape) return

    const handleEscape = (e: KeyboardEvent) => {
      if (e.key === 'Escape') {
        onClose()
      }
    }

    document.addEventListener('keydown', handleEscape)
    return () => document.removeEventListener('keydown', handleEscape)
  }, [isOpen, closeOnEscape, onClose])

  // 阻止body滚动
  useEffect(() => {
    if (isOpen) {
      document.body.style.overflow = 'hidden'
    } else {
      document.body.style.overflow = ''
    }
    return () => {
      document.body.style.overflow = ''
    }
  }, [isOpen])

  useEffect(() => {
    setIsMounted(true)
  }, [])

  if (!isOpen) return null

  const handleOverlayMouseDown = (e: React.MouseEvent<HTMLDivElement>) => {
    shouldCloseRef.current = closeOnOverlayClick && e.target === e.currentTarget
  }

  const handleOverlayMouseUp = (e: React.MouseEvent<HTMLDivElement>) => {
    if (shouldCloseRef.current && e.target === e.currentTarget) {
      onClose()
    }
    shouldCloseRef.current = false
  }

  const sizeClass = styles.modalStyles.sizes[size]
  const sizeInlineStyle = sizeStyleMap[size] || sizeStyleMap.medium
  const isCustomContent = !title && !showCloseButton && !footer
  const containerInlineStyle: CSSProperties = {
    ...sizeInlineStyle,
    borderRadius: MODAL_BORDER_RADIUS,
    ...(isCustomContent && { maxHeight: '92vh' }),
    ...(containerStyle || {}),
  }

  const contentInlineStyle: CSSProperties = {
    borderRadius: MODAL_BORDER_RADIUS,
  }

  const modalMarkup = (
    <div
      className={`${styles.modalStyles.overlay} ${className}`}
      onMouseDown={handleOverlayMouseDown}
      onMouseUp={handleOverlayMouseUp}
      role="dialog"
      aria-modal="true"
      aria-labelledby={title ? 'modal-title' : undefined}
    >
      <div
        ref={modalRef}
        className={cn(styles.modalStyles.container, sizeClass, containerClassName)}
        style={containerInlineStyle}
        onClick={(e) => e.stopPropagation()}
      >
        <div className={cn(styles.modalStyles.content, contentClassName)} style={contentInlineStyle}>
          {(title || showCloseButton) && (
            <div className={styles.modalStyles.header}>
              {title && (
                <h3 id="modal-title" className={styles.modalStyles.title}>
                  {title}
                </h3>
              )}
              {showCloseButton && (
                <button
                  type="button"
                  onClick={onClose}
                  className={styles.modalStyles.closeButton}
                  aria-label="关闭"
                >
                  <svg
                    className="w-5 h-5"
                    fill="none"
                    stroke="currentColor"
                    viewBox="0 0 24 24"
                  >
                    <path
                      strokeLinecap="round"
                      strokeLinejoin="round"
                      strokeWidth={2}
                      d="M6 18L18 6M6 6l12 12"
                    />
                  </svg>
                </button>
              )}
            </div>
          )}

          {title || showCloseButton || footer ? (
            <>
              <div className={cn(styles.modalStyles.body, bodyClassName)} style={bodyStyle}>
                {children}
              </div>
              {footer && <div className={styles.modalStyles.footer}>{footer}</div>}
            </>
          ) : (
            children
          )}
        </div>
      </div>
    </div>
  )

  if (!isMounted) {
    return null
  }

  return createPortal(modalMarkup, document.body)
}