import React, { CSSProperties } from 'react';
import { useNode, UserComponent } from '@craftjs/core';
import { cssPropsToString } from '../../utils/style-helpers';
import { AnchorIdField } from '../../ui/AnchorIdField';

interface FeatureItem {
  title: string;
  description: string;
  icon: string;
  mediaType?: 'icon' | 'image';   // default behaves as 'icon' when undefined
  image?: string;
  imageAlt?: string;
  buttonText?: string;
  buttonUrl?: string;
}

/* ---------- Image upload helper (same as Navbar/ImageBlock) ---------- */

async function uploadToWhp(file: File): Promise<string | null> {
  const cfg = (window as any).WHP_CONFIG;
  if (!cfg) return URL.createObjectURL(file);
  const formData = new FormData();
  formData.append('file', file);
  try {
    const resp = await fetch(`${cfg.apiUrl}?action=upload_asset&site_id=${cfg.siteId}`, {
      method: 'POST',
      headers: { 'X-CSRF-Token': cfg.csrfToken },
      body: formData,
    });
    const data = await resp.json();
    if (data.success && data.url) return data.url;
    return null;
  } catch { return null; }
}

interface FeaturesGridProps {
  features?: FeatureItem[];
  style?: CSSProperties;
  anchorId?: string;
}

const defaultFeatures: FeatureItem[] = [
  { title: 'Fast & Reliable', description: 'Built for performance with optimized loading and rock-solid uptime.', icon: '⚡' },
  { title: 'Easy to Use', description: 'Intuitive drag-and-drop interface that anyone can master in minutes.', icon: '✨' },
  { title: 'Fully Responsive', description: 'Looks great on every device, from phones to ultrawide monitors.', icon: '📱' },
];

export const FeaturesGrid: UserComponent<FeaturesGridProps> = ({
  features = defaultFeatures,
  style = {},
  anchorId,
}) => {
  const {
    connectors: { connect, drag },
    selected,
  } = useNode((node) => ({
    selected: node.events.selected,
  }));

  return (
    <section
      ref={(ref: HTMLElement | null): void => { if (ref) connect(drag(ref)); }}
      id={anchorId || undefined}
      style={{
        padding: '80px 20px',
        backgroundColor: '#ffffff',
        outline: selected ? '2px solid #3b82f6' : 'none',
        ...style,
      }}
    >
      <div style={{ maxWidth: '1100px', margin: '0 auto', display: 'grid', gridTemplateColumns: 'repeat(3, 1fr)', gap: '32px' }}>
        {(Array.isArray(features) ? features : []).map((feat, i) => (
          <div
            key={i}
            style={{
              textAlign: 'center',
              padding: '32px 24px',
              borderRadius: '12px',
              backgroundColor: '#f8fafc',
              border: '1px solid #e2e8f0',
            }}
          >
            {feat.mediaType === 'image' && feat.image ? (
              <img
                src={feat.image}
                alt={feat.imageAlt || feat.title || ''}
                style={{ maxWidth: '100%', height: 'auto', marginBottom: '16px', borderRadius: '8px' }}
              />
            ) : (
              <div style={{ fontSize: '36px', marginBottom: '16px' }}>{feat.icon}</div>
            )}
            <h3 style={{ fontSize: '20px', fontWeight: '600', color: '#18181b', marginBottom: '8px' }}>{feat.title}</h3>
            <p style={{ fontSize: '14px', color: '#64748b', lineHeight: '1.6' }}>{feat.description}</p>
            {feat.buttonText ? (
              <a
                href={feat.buttonUrl || '#'}
                onClick={(e) => e.preventDefault()}
                style={{ display: 'inline-block', marginTop: '16px', padding: '10px 24px', background: '#3b82f6', color: '#fff', borderRadius: '8px', textDecoration: 'none', fontSize: '14px', fontWeight: 600 }}
              >
                {feat.buttonText}
              </a>
            ) : null}
          </div>
        ))}
      </div>
    </section>
  );
};

/* ---------- Settings panel ---------- */

const FeaturesGridSettings: React.FC = () => {
  const { actions: { setProp }, props } = useNode((node) => ({
    props: node.data.props as FeaturesGridProps,
  }));

  const features = props.features || defaultFeatures;

  const inputStyle: CSSProperties = {
    width: '100%', padding: '3px 6px', background: '#27272a', color: '#e4e4e7',
    border: '1px solid #3f3f46', borderRadius: 4, fontSize: 11,
  };

  const updateFeature = (index: number, field: keyof FeatureItem, value: string) => {
    setProp((p: FeaturesGridProps) => {
      const updated = [...(p.features || defaultFeatures)];
      updated[index] = { ...updated[index], [field]: value };
      p.features = updated;
    });
  };

  const handleImageUpload = async (index: number, file: File) => {
    const url = await uploadToWhp(file);
    if (url) updateFeature(index, 'image', url);
  };

  const addFeature = () => {
    setProp((p: FeaturesGridProps) => {
      p.features = [...(p.features || defaultFeatures), { title: 'New Feature', description: 'Describe this feature.', icon: '🔧' }];
    });
  };

  const removeFeature = (index: number) => {
    setProp((p: FeaturesGridProps) => {
      const updated = [...(p.features || defaultFeatures)];
      updated.splice(index, 1);
      p.features = updated;
    });
  };

  const bgPresets = ['#ffffff', '#f8fafc', '#f1f5f9', '#18181b', '#0f172a'];

  return (
    <div style={{ padding: '12px', display: 'flex', flexDirection: 'column', gap: '14px' }}>
      <AnchorIdField />
      <div>
        <label style={{ fontSize: 11, color: '#a1a1aa', display: 'block', marginBottom: 6 }}>Background</label>
        <div style={{ display: 'flex', gap: 4, flexWrap: 'wrap' }}>
          {bgPresets.map((c) => (
            <button
              key={c}
              onClick={() => setProp((p: FeaturesGridProps) => { p.style = { ...p.style, backgroundColor: c }; })}
              style={{
                width: 24, height: 24, borderRadius: 4, border: '1px solid #3f3f46',
                backgroundColor: c, cursor: 'pointer',
                outline: props.style?.backgroundColor === c ? '2px solid #3b82f6' : 'none',
                outlineOffset: 1,
              }}
            />
          ))}
        </div>
      </div>

      <div>
        <label style={{ fontSize: 11, color: '#a1a1aa', display: 'block', marginBottom: 6 }}>Features</label>
        <div style={{ display: 'flex', flexDirection: 'column', gap: 8 }}>
          {(Array.isArray(features) ? features : []).map((feat, i) => (
            <div key={i} style={{ background: '#1e1e22', borderRadius: 6, padding: 8, display: 'flex', flexDirection: 'column', gap: 4 }}>
              <div style={{ display: 'flex', gap: 4 }}>
                <input type="text" value={feat.icon} onChange={(e) => updateFeature(i, 'icon', e.target.value)} placeholder="Icon" style={{ ...inputStyle, width: 40, flex: 'none', textAlign: 'center' }} />
                <input type="text" value={feat.title} onChange={(e) => updateFeature(i, 'title', e.target.value)} placeholder="Title" style={{ ...inputStyle, flex: 1 }} />
                <button
                  onClick={() => removeFeature(i)}
                  style={{ padding: '2px 6px', fontSize: 11, background: '#ef4444', color: '#fff', border: 'none', borderRadius: 4, cursor: 'pointer' }}
                >
                  X
                </button>
              </div>
              <textarea
                value={feat.description}
                onChange={(e) => updateFeature(i, 'description', e.target.value)}
                placeholder="Description"
                rows={2}
                style={{ ...inputStyle, resize: 'vertical' }}
              />

              {/* Icon / Image toggle */}
              <div style={{ display: 'flex', gap: 4 }}>
                {(['icon', 'image'] as const).map((mt) => {
                  const active = (feat.mediaType || 'icon') === mt;
                  return (
                    <button
                      key={mt}
                      onClick={() => updateFeature(i, 'mediaType', mt)}
                      style={{
                        flex: 1, padding: '3px 6px', fontSize: 11, cursor: 'pointer',
                        background: active ? '#3b82f6' : '#27272a',
                        color: active ? '#fff' : '#e4e4e7',
                        border: '1px solid #3f3f46', borderRadius: 4,
                      }}
                    >
                      {mt === 'icon' ? 'Icon' : 'Image'}
                    </button>
                  );
                })}
              </div>

              {(feat.mediaType || 'icon') === 'image' ? (
                <>
                  <div style={{ display: 'flex', gap: 4 }}>
                    <label
                      style={{ padding: '3px 6px', fontSize: 11, cursor: 'pointer', background: '#27272a', color: '#e4e4e7', border: '1px solid #3f3f46', borderRadius: 4, flex: 'none', whiteSpace: 'nowrap' }}
                    >
                      Upload
                      <input
                        type="file"
                        accept="image/*"
                        style={{ display: 'none' }}
                        onChange={(e) => { const f = e.target.files?.[0]; if (f) void handleImageUpload(i, f); }}
                      />
                    </label>
                    <input type="text" value={feat.image || ''} onChange={(e) => updateFeature(i, 'image', e.target.value)} placeholder="Image URL" style={{ ...inputStyle, flex: 1 }} />
                  </div>
                  <input type="text" value={feat.imageAlt || ''} onChange={(e) => updateFeature(i, 'imageAlt', e.target.value)} placeholder="Alt text (optional)" style={inputStyle} />
                </>
              ) : null}

              {/* Button (optional) */}
              <label style={{ fontSize: 11, color: '#a1a1aa', display: 'block', marginTop: 2 }}>Button (optional)</label>
              <input type="text" value={feat.buttonText || ''} onChange={(e) => updateFeature(i, 'buttonText', e.target.value)} placeholder="Button text" style={inputStyle} />
              <input type="text" value={feat.buttonUrl || ''} onChange={(e) => updateFeature(i, 'buttonUrl', e.target.value)} placeholder="https://... or /page" style={inputStyle} />
            </div>
          ))}
        </div>
        <button
          onClick={addFeature}
          style={{ marginTop: 6, width: '100%', padding: '6px', fontSize: 11, background: '#27272a', color: '#e4e4e7', border: '1px solid #3f3f46', borderRadius: 4, cursor: 'pointer' }}
        >
          + Add Feature
        </button>
      </div>
    </div>
  );
};

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

FeaturesGrid.craft = {
  displayName: 'Features Grid',
  props: {
    features: defaultFeatures,
    style: { backgroundColor: '#ffffff' },
    anchorId: '',
  },
  rules: {
    canDrag: () => true,
    canMoveIn: () => false,
    canMoveOut: () => true,
  },
  related: {
    settings: FeaturesGridSettings,
  },
};

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

(FeaturesGrid as any).toHtml = (props: FeaturesGridProps, _childrenHtml: string) => {
  const esc = (s: any) => String(s ?? "").replace(/</g, '&lt;').replace(/>/g, '&gt;').replace(/"/g, '&quot;');
  const sectionStyle = cssPropsToString({
    padding: '80px 20px',
    ...props.style,
  });
  const idAttr = props.anchorId ? ` id="${esc(props.anchorId)}"` : '';
  const cards = (props.features || defaultFeatures).map((feat) => {
    const media = feat.mediaType === 'image' && feat.image
      ? `<img src="${esc(feat.image)}" alt="${esc(feat.imageAlt || feat.title || '')}" style="max-width:100%;height:auto;margin-bottom:16px;border-radius:8px">`
      : `<div style="font-size:36px;margin-bottom:16px">${esc(feat.icon)}</div>`;
    const button = feat.buttonText
      ? `\n      <a href="${esc(feat.buttonUrl || '#')}" style="display:inline-block;margin-top:16px;padding:10px 24px;background:#3b82f6;color:#fff;border-radius:8px;text-decoration:none;font-size:14px;font-weight:600">${esc(feat.buttonText)}</a>`
      : '';
    return `<div style="text-align:center;padding:32px 24px;border-radius:12px;background-color:#f8fafc;border:1px solid #e2e8f0">
      ${media}
      <h3 style="font-size:20px;font-weight:600;color:#18181b;margin-bottom:8px">${esc(feat.title)}</h3>
      <p style="font-size:14px;color:#64748b;line-height:1.6">${esc(feat.description)}</p>${button}
    </div>`;
  }).join('\n    ');

  return {
    html: `<section${idAttr}${sectionStyle ? ` style="${sectionStyle}"` : ''}>
  <div style="max-width:1100px;margin:0 auto;display:grid;grid-template-columns:repeat(3,1fr);gap:32px">
    ${cards}
  </div>
</section>`,
  };
};