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

interface AccordionItem {
  title: string;
  content: string;
  isOpen?: boolean;
}

interface AccordionProps {
  items?: AccordionItem[];
  style?: CSSProperties;
  headerBg?: string;
  headerColor?: string;
  contentBg?: string;
  borderColor?: string;
  anchorId?: string;
}

const defaultItems: AccordionItem[] = [
  { title: 'What is this product?', content: 'Our product is a powerful yet easy-to-use tool designed to help you build beautiful websites without writing a single line of code.', isOpen: true },
  { title: 'How do I get started?', content: 'Simply sign up for a free account, choose a template, and start customizing. Our drag-and-drop editor makes it easy to create professional pages in minutes.', isOpen: false },
  { title: 'Is there a free plan?', content: 'Yes! We offer a generous free tier that includes all core features. Upgrade anytime to unlock advanced capabilities like custom domains and analytics.', isOpen: false },
];

export const Accordion: UserComponent<AccordionProps> = ({
  items = defaultItems,
  style = {},
  headerBg = '#f8fafc',
  headerColor = '#18181b',
  contentBg = '#ffffff',
  borderColor = '#e2e8f0',
  anchorId,
}) => {
  const {
    connectors: { connect, drag },
    selected,
  } = useNode((node) => ({
    selected: node.events.selected,
  }));

  const [openIndexes, setOpenIndexes] = useState<Set<number>>(() => {
    const initial = new Set<number>();
    items.forEach((item, i) => { if (item.isOpen) initial.add(i); });
    return initial;
  });

  const toggle = (index: number) => {
    setOpenIndexes((prev) => {
      const next = new Set(prev);
      if (next.has(index)) next.delete(index);
      else next.add(index);
      return next;
    });
  };

  return (
    <section
      ref={(ref: HTMLElement | null): void => { if (ref) connect(drag(ref)); }}
      id={anchorId || undefined}
      style={{
        padding: '60px 20px',
        backgroundColor: '#ffffff',
        outline: selected ? '2px solid #3b82f6' : 'none',
        ...style,
      }}
    >
      <div style={{ maxWidth: '800px', margin: '0 auto', display: 'flex', flexDirection: 'column', gap: '0px' }}>
        {items.map((item, i) => {
          const isOpen = openIndexes.has(i);
          return (
            <div
              key={i}
              style={{
                border: `1px solid ${borderColor}`,
                borderBottom: i === items.length - 1 ? `1px solid ${borderColor}` : 'none',
                ...(i === 0 ? { borderTopLeftRadius: '8px', borderTopRightRadius: '8px' } : {}),
                ...(i === items.length - 1 ? { borderBottomLeftRadius: '8px', borderBottomRightRadius: '8px', borderBottom: `1px solid ${borderColor}` } : {}),
              }}
            >
              <div
                onClick={() => toggle(i)}
                style={{
                  padding: '16px 20px',
                  backgroundColor: headerBg,
                  color: headerColor,
                  cursor: 'pointer',
                  display: 'flex',
                  justifyContent: 'space-between',
                  alignItems: 'center',
                  fontWeight: '600',
                  fontSize: '16px',
                  userSelect: 'none',
                  ...(i === 0 ? { borderTopLeftRadius: '7px', borderTopRightRadius: '7px' } : {}),
                  ...(i === items.length - 1 && !isOpen ? { borderBottomLeftRadius: '7px', borderBottomRightRadius: '7px' } : {}),
                }}
              >
                <span>{item.title}</span>
                <span style={{ fontSize: '12px', transition: 'transform 0.2s', transform: isOpen ? 'rotate(180deg)' : 'rotate(0deg)' }}>&#9660;</span>
              </div>
              {isOpen && (
                <div
                  style={{
                    padding: '16px 20px',
                    backgroundColor: contentBg,
                    color: '#4b5563',
                    fontSize: '14px',
                    lineHeight: '1.6',
                    borderTop: `1px solid ${borderColor}`,
                    ...(i === items.length - 1 ? { borderBottomLeftRadius: '7px', borderBottomRightRadius: '7px' } : {}),
                  }}
                >
                  {item.content}
                </div>
              )}
            </div>
          );
        })}
      </div>
    </section>
  );
};

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

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

  const items = props.items || defaultItems;

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

  const labelStyle: CSSProperties = { fontSize: 11, color: '#a1a1aa', display: 'block', marginBottom: 6 };

  const updateItem = (index: number, field: keyof AccordionItem, value: string | boolean) => {
    setProp((p: AccordionProps) => {
      const updated = [...(p.items || defaultItems)];
      updated[index] = { ...updated[index], [field]: value };
      p.items = updated;
    });
  };

  const addItem = () => {
    setProp((p: AccordionProps) => {
      p.items = [...(p.items || defaultItems), { title: 'New Question', content: 'Answer goes here.', isOpen: false }];
    });
  };

  const removeItem = (index: number) => {
    setProp((p: AccordionProps) => {
      const updated = [...(p.items || defaultItems)];
      updated.splice(index, 1);
      p.items = updated;
    });
  };

  const colorSwatches = ['#f8fafc', '#f1f5f9', '#e2e8f0', '#ffffff', '#18181b', '#1e293b', '#3b82f6', '#8b5cf6'];

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

      <div>
        <label style={labelStyle}>Header Text Color</label>
        <div style={{ display: 'flex', gap: 4, flexWrap: 'wrap' }}>
          {['#18181b', '#1f2937', '#374151', '#ffffff', '#e2e8f0', '#3b82f6'].map((c) => (
            <button
              key={c}
              onClick={() => setProp((p: AccordionProps) => { p.headerColor = c; })}
              style={{
                width: 24, height: 24, borderRadius: 4, border: '1px solid #3f3f46',
                backgroundColor: c, cursor: 'pointer',
                outline: props.headerColor === c ? '2px solid #3b82f6' : 'none',
                outlineOffset: 1,
              }}
            />
          ))}
        </div>
      </div>

      <div>
        <label style={labelStyle}>Content Background</label>
        <div style={{ display: 'flex', gap: 4, flexWrap: 'wrap' }}>
          {['#ffffff', '#f8fafc', '#f1f5f9', '#18181b', '#1e293b'].map((c) => (
            <button
              key={c}
              onClick={() => setProp((p: AccordionProps) => { p.contentBg = c; })}
              style={{
                width: 24, height: 24, borderRadius: 4, border: '1px solid #3f3f46',
                backgroundColor: c, cursor: 'pointer',
                outline: props.contentBg === c ? '2px solid #3b82f6' : 'none',
                outlineOffset: 1,
              }}
            />
          ))}
        </div>
      </div>

      <div>
        <label style={labelStyle}>Border Color</label>
        <div style={{ display: 'flex', gap: 4, flexWrap: 'wrap' }}>
          {['#e2e8f0', '#cbd5e1', '#d1d5db', '#3f3f46', '#52525b'].map((c) => (
            <button
              key={c}
              onClick={() => setProp((p: AccordionProps) => { p.borderColor = c; })}
              style={{
                width: 24, height: 24, borderRadius: 4, border: '1px solid #3f3f46',
                backgroundColor: c, cursor: 'pointer',
                outline: props.borderColor === c ? '2px solid #3b82f6' : 'none',
                outlineOffset: 1,
              }}
            />
          ))}
        </div>
      </div>

      <div>
        <label style={labelStyle}>Items</label>
        <div style={{ display: 'flex', flexDirection: 'column', gap: 8 }}>
          {items.map((item, 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={item.title} onChange={(e) => updateItem(i, 'title', e.target.value)} placeholder="Title" style={{ ...inputStyle, flex: 1 }} />
                <button
                  onClick={() => removeItem(i)}
                  style={{ padding: '2px 6px', fontSize: 11, background: '#ef4444', color: '#fff', border: 'none', borderRadius: 4, cursor: 'pointer' }}
                >
                  X
                </button>
              </div>
              <textarea
                value={item.content}
                onChange={(e) => updateItem(i, 'content', e.target.value)}
                placeholder="Content"
                rows={2}
                style={{ ...inputStyle, resize: 'vertical' }}
              />
            </div>
          ))}
        </div>
        <button
          onClick={addItem}
          style={{ marginTop: 6, width: '100%', padding: '6px', fontSize: 11, background: '#27272a', color: '#e4e4e7', border: '1px solid #3f3f46', borderRadius: 4, cursor: 'pointer' }}
        >
          + Add Item
        </button>
      </div>
    </div>
  );
};

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

Accordion.craft = {
  displayName: 'Accordion',
  props: {
    items: defaultItems,
    style: { backgroundColor: '#ffffff' },
    headerBg: '#f8fafc',
    headerColor: '#18181b',
    contentBg: '#ffffff',
    borderColor: '#e2e8f0',
    anchorId: '',
  },
  rules: {
    canDrag: () => true,
    canMoveIn: () => false,
    canMoveOut: () => true,
  },
  related: {
    settings: AccordionSettings,
  },
};

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

(Accordion as any).toHtml = (props: AccordionProps, _childrenHtml: string) => {
  const esc = (s: any) => String(s ?? "").replace(/</g, '&lt;').replace(/>/g, '&gt;').replace(/"/g, '&quot;');
  const sectionStyle = cssPropsToString({
    padding: '60px 20px',
    ...props.style,
  });
  const idAttr = props.anchorId ? ` id="${esc(props.anchorId)}"` : '';
  const headerBg = props.headerBg || '#f8fafc';
  const headerColor = props.headerColor || '#18181b';
  const contentBg = props.contentBg || '#ffffff';
  const borderColor = props.borderColor || '#e2e8f0';
  const items = props.items || defaultItems;

  const panels = items.map((item, i) => {
    const openAttr = item.isOpen ? ' open' : '';
    const topRadius = i === 0 ? 'border-top-left-radius:8px;border-top-right-radius:8px;' : '';
    const bottomRadius = i === items.length - 1 ? 'border-bottom-left-radius:8px;border-bottom-right-radius:8px;' : '';
    const borderBottom = i === items.length - 1 ? `border:1px solid ${borderColor};` : `border:1px solid ${borderColor};border-bottom:none;`;
    return `<details${openAttr} style="${borderBottom}${topRadius}${bottomRadius}">
      <summary style="padding:16px 20px;background-color:${headerBg};color:${headerColor};cursor:pointer;font-weight:600;font-size:16px;list-style:none;display:flex;justify-content:space-between;align-items:center">
        ${esc(item.title)}
      </summary>
      <div style="padding:16px 20px;background-color:${contentBg};color:#4b5563;font-size:14px;line-height:1.6;border-top:1px solid ${borderColor}">
        ${esc(item.content)}
      </div>
    </details>`;
  }).join('\n    ');

  return {
    html: `<section${idAttr}${sectionStyle ? ` style="${sectionStyle}"` : ''}>
  <div style="max-width:800px;margin:0 auto;display:flex;flex-direction:column">
    ${panels}
  </div>
  <style>details summary::-webkit-details-marker{display:none}details summary::marker{display:none}</style>
</section>`,
  };
};