import React, { CSSProperties } from 'react';
import { useNode, UserComponent } from '@craftjs/core';
import { cssPropsToString } from '../../utils/style-helpers';
import { CtaButton, normalizeCtas, ctaInlineStyle, ctasToHtml } from './_cta-helpers';
import { escapeHtml, escapeAttr, safeUrl, cssValue } from '../../utils/escape';

interface HeroProps {
  heading?: string;
  subtitle?: string;
  /** New dynamic CTAs. When set (length > 0), legacy primary/secondary fields are ignored. */
  ctas?: CtaButton[];
  /** Legacy — kept for backwards compatibility with saved projects. */
  buttonText?: string;
  buttonHref?: string;
  secondaryButtonText?: string;
  secondaryButtonHref?: string;
  bgType?: 'color' | 'gradient' | 'image' | 'video';
  bgColor?: string;
  bgGradientFrom?: string;
  bgGradientTo?: string;
  bgGradientAngle?: number;
  bgImage?: string;
  bgVideo?: string;
  overlayColor?: string;
  overlayOpacity?: number;
  textColor?: string;
  buttonBgColor?: string;
  buttonTextColor?: string;
  minHeight?: string;
  verticalAlign?: 'top' | 'center' | 'bottom';
  textAlign?: 'left' | 'center' | 'right';
  anchorId?: string;
  style?: CSSProperties;
}

// Helper: build the background CSS value
function buildBackground(props: HeroProps): string {
  switch (props.bgType) {
    case 'gradient':
      return `linear-gradient(${props.bgGradientAngle || 135}deg, ${props.bgGradientFrom || '#667eea'}, ${props.bgGradientTo || '#764ba2'})`;
    case 'image':
      return props.bgImage ? `url('${props.bgImage}') center/cover no-repeat` : '#1e293b';
    case 'color':
    default:
      return props.bgColor || '#1e293b';
  }
}

export const HeroSimple: UserComponent<HeroProps> = ({
  heading = 'Build Something Amazing',
  subtitle = 'Create beautiful websites without writing a single line of code.',
  ctas,
  buttonText,
  buttonHref,
  secondaryButtonText,
  secondaryButtonHref,
  bgType = 'color',
  bgColor = '#1e293b',
  bgGradientFrom = '#667eea',
  bgGradientTo = '#764ba2',
  bgGradientAngle = 135,
  bgImage = '',
  bgVideo = '',
  overlayColor = '#000000',
  overlayOpacity = 0,
  textColor = '#ffffff',
  buttonBgColor = '#3b82f6',
  buttonTextColor = '#ffffff',
  minHeight = '500px',
  verticalAlign = 'center',
  textAlign = 'center',
  anchorId,
  style = {},
}) => {
  const { connectors: { connect, drag } } = useNode();

  const bg = buildBackground({
    bgType, bgColor, bgGradientFrom, bgGradientTo, bgGradientAngle, bgImage,
  } as HeroProps);

  const justifyMap = { top: 'flex-start', center: 'center', bottom: 'flex-end' };

  const effectiveCtas = normalizeCtas({ ctas, buttonText, buttonHref, secondaryButtonText, secondaryButtonHref });
  const ctaDefaults = {
    primaryBg: buttonBgColor,
    primaryText: buttonTextColor,
    outlineText: textColor,
  };

  return (
    <section
      ref={(ref: HTMLElement | null): void => { if (ref) connect(drag(ref)); }}
      id={anchorId || undefined}
      style={{
        ...style,
        background: bgType !== 'image' ? bg : undefined,
        backgroundImage: bgType === 'image' && bgImage ? `url('${bgImage}')` : undefined,
        backgroundSize: bgType === 'image' ? 'cover' : undefined,
        backgroundPosition: bgType === 'image' ? 'center' : undefined,
        minHeight: minHeight === '100vh' ? '100vh' : minHeight,
        display: 'flex',
        alignItems: justifyMap[verticalAlign] || 'center',
        justifyContent: 'center',
        position: 'relative',
        overflow: 'hidden',
        padding: '60px 20px',
      }}
    >
      {/* Video background */}
      {bgType === 'video' && bgVideo && (
        <video
          src={bgVideo}
          autoPlay muted loop playsInline
          style={{
            position: 'absolute', top: 0, left: 0, width: '100%', height: '100%',
            objectFit: 'cover', zIndex: 0,
          }}
        />
      )}

      {/* Overlay (renders AFTER video so it sits on top) */}
      {overlayOpacity > 0 && (
        <div style={{
          position: 'absolute', top: 0, left: 0, right: 0, bottom: 0,
          backgroundColor: overlayColor,
          opacity: overlayOpacity / 100,
          zIndex: 1,
        }} />
      )}

      {/* Content */}
      <div style={{
        maxWidth: '800px',
        width: '100%',
        position: 'relative',
        zIndex: 2,
        textAlign: textAlign as any,
      }}>
        <h1 style={{
          fontSize: '48px', fontWeight: '700', color: textColor,
          marginBottom: '16px', lineHeight: '1.2',
        }}>
          {heading}
        </h1>
        <p style={{
          fontSize: '20px', color: textColor,
          opacity: 0.85, marginBottom: '32px', lineHeight: '1.6',
          whiteSpace: 'pre-line',
        }}>
          {subtitle}
        </p>
        <div style={{ display: 'flex', gap: '12px', justifyContent: textAlign === 'center' ? 'center' : textAlign === 'right' ? 'flex-end' : 'flex-start', flexWrap: 'wrap' }}>
          {effectiveCtas.map((cta, i) => (
            <a key={i} href={cta.href || '#'} onClick={(e) => e.preventDefault()}
              style={ctaInlineStyle(cta, ctaDefaults)}>
              {cta.text}
            </a>
          ))}
        </div>
      </div>
    </section>
  );
};

/* ---------- Craft config ---------- */

HeroSimple.craft = {
  displayName: 'Hero',
  props: {
    heading: 'Build Something Amazing',
    subtitle: 'Create beautiful websites without writing a single line of code.',
    ctas: [
      { text: 'Get Started', href: '#', variant: 'primary' },
    ] as CtaButton[],
    bgType: 'color',
    bgColor: '#1e293b',
    bgGradientFrom: '#667eea',
    bgGradientTo: '#764ba2',
    bgGradientAngle: 135,
    bgImage: '',
    bgVideo: '',
    overlayColor: '#000000',
    overlayOpacity: 0,
    textColor: '#ffffff',
    buttonBgColor: '#3b82f6',
    buttonTextColor: '#ffffff',
    minHeight: '500px',
    verticalAlign: 'center',
    textAlign: 'center',
    anchorId: '',
    style: {},
  },
  rules: {
    canDrag: () => true,
    canMoveIn: () => false,
    canMoveOut: () => true,
  },
};

/* ---------- HTML export ---------- */

(HeroSimple as any).toHtml = (props: HeroProps, _childrenHtml: string) => {
  const bg = buildBackground(props);
  const justifyMap: Record<string, string> = { top: 'flex-start', center: 'center', bottom: 'flex-end' };

  const sectionStyle = cssPropsToString({
    background: props.bgType !== 'image' ? bg : undefined,
    backgroundImage: props.bgType === 'image' && props.bgImage ? `url('${props.bgImage}')` : undefined,
    backgroundSize: props.bgType === 'image' ? 'cover' : undefined,
    backgroundPosition: props.bgType === 'image' ? 'center' : undefined,
    minHeight: props.minHeight || '500px',
    display: 'flex',
    alignItems: justifyMap[props.verticalAlign || 'center'],
    justifyContent: 'center',
    position: 'relative',
    overflow: 'hidden',
    padding: '60px 20px',
    ...props.style,
  });

  let overlayHtml = '';
  if ((props.overlayOpacity || 0) > 0) {
    const overlayColor = cssValue(props.overlayColor) || '#000';
    overlayHtml = `<div style="position:absolute;top:0;left:0;right:0;bottom:0;background-color:${overlayColor};opacity:${(props.overlayOpacity || 0) / 100};z-index:1"></div>`;
  }

  let videoHtml = '';
  if (props.bgType === 'video' && props.bgVideo) {
    videoHtml = `<video src="${escapeAttr(safeUrl(props.bgVideo))}" autoplay muted loop playsinline style="position:absolute;top:0;left:0;width:100%;height:100%;object-fit:cover;z-index:0"></video>`;
  }

  // Allowlisted -- `textAlign` is declared as a 'left'|'center'|'right' union
  // but arrives unchecked via AI update_props / deserialized state; it is
  // interpolated raw into the content div's style attribute below, so any
  // other value must collapse to a known-safe default rather than being
  // echoed into the markup.
  const ALLOWED_TEXT_ALIGN = ['left', 'center', 'right'];
  const textAlign = ALLOWED_TEXT_ALIGN.includes(props.textAlign as string) ? (props.textAlign as string) : 'center';
  const justifyBtn = textAlign === 'center' ? 'center' : textAlign === 'right' ? 'flex-end' : 'flex-start';

  const ctas = normalizeCtas(props);
  const buttonsHtml = ctasToHtml(ctas, {
    primaryBg: props.buttonBgColor || '#3b82f6',
    primaryText: props.buttonTextColor || '#fff',
    outlineText: props.textColor || '#fff',
  });

  const idAttr = props.anchorId ? ` id="${escapeAttr(props.anchorId)}"` : '';
  const heroTextColor = cssValue(props.textColor) || '#fff';
  return {
    html: `<section${idAttr} style="${sectionStyle}">
${videoHtml}${overlayHtml}
<div style="max-width:800px;width:100%;position:relative;z-index:2;text-align:${textAlign}">
  <h1 style="font-size:48px;font-weight:700;color:${heroTextColor};margin-bottom:16px;line-height:1.2">${escapeHtml(props.heading || '')}</h1>
  <p style="font-size:20px;color:${heroTextColor};opacity:0.85;margin-bottom:32px;line-height:1.6;white-space:pre-line">${escapeHtml(props.subtitle || '')}</p>
  <div style="display:flex;gap:12px;justify-content:${justifyBtn};flex-wrap:wrap">${buttonsHtml}</div>
</div>
</section>`,
  };
};
