import React, { CSSProperties, useCallback, useRef, useEffect } from 'react';
import { useNode, UserComponent } from '@craftjs/core';
import { cssPropsToString } from '../../utils/style-helpers';
import { SettingsTabs } from '../../ui/SettingsTabs';
import { TypographyControl } from '../../ui/TypographyControl';
import { AdvancedTab } from '../../ui/AdvancedTab';

type HeadingLevel = 'h1' | 'h2' | 'h3' | 'h4' | 'h5' | 'h6';

interface HeadingProps {
  text?: string;
  level?: HeadingLevel;
  style?: CSSProperties;
  cssId?: string;
  cssClass?: string;
  hideOnDesktop?: boolean;
  hideOnTablet?: boolean;
  hideOnMobile?: boolean;
  animation?: string;
  animationDelay?: string;
}

export const Heading: UserComponent<HeadingProps> = ({
  text = 'Heading',
  level = 'h2',
  style = {},
}) => {
  const {
    connectors: { connect, drag },
    selected,
    actions: { setProp },
  } = useNode((node) => ({
    selected: node.events.selected,
  }));

  const elRef = useRef<HTMLElement | null>(null);
  const editedTextRef = useRef<string | null>(null);

  const commitText = useCallback(() => {
    if (elRef.current) {
      const newText = elRef.current.innerText;
      editedTextRef.current = newText;
      setProp((p: HeadingProps) => { p.text = newText; });
    }
  }, [setProp]);

  // Commit on blur
  const handleBlur = useCallback(() => { commitText(); }, [commitText]);

  // Also commit on deselect via effect
  useEffect(() => {
    if (!selected && editedTextRef.current !== null) {
      setProp((p: HeadingProps) => { p.text = editedTextRef.current!; });
      editedTextRef.current = null;
    }
  }, [selected, setProp]);

  // Set DOM text on mount and when text prop changes externally (not during editing)
  useEffect(() => {
    if (elRef.current && !selected && editedTextRef.current === null) {
      elRef.current.innerText = text || '';
    }
  }, [text, selected]);

  return React.createElement(level, {
    ref: (ref: HTMLElement | null): void => {
      elRef.current = ref;
      if (ref) connect(drag(ref));
    },
    contentEditable: selected,
    suppressContentEditableWarning: true,
    onBlur: handleBlur,
    onInput: () => {
      // Track that we have unsaved edits
      if (elRef.current) {
        editedTextRef.current = elRef.current.innerText;
      }
    },
    style: { outline: 'none', cursor: selected ? 'text' : 'pointer', minHeight: '1em', ...style },
  });
};

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

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

  const levels: HeadingLevel[] = ['h1', 'h2', 'h3', 'h4', 'h5', 'h6'];

  return (
    <SettingsTabs
      general={
        <div style={{ display: 'flex', flexDirection: 'column', gap: 14 }}>
          <div>
            <label style={{ fontSize: 11, fontWeight: 600, color: '#a1a1aa', display: 'block', marginBottom: 6, textTransform: 'uppercase', letterSpacing: '0.3px' }}>Heading Level</label>
            <div style={{ display: 'flex', gap: 4 }}>
              {levels.map((l) => (
                <button
                  key={l}
                  onClick={() => setProp((p: HeadingProps) => { p.level = l; })}
                  style={{
                    flex: 1, padding: '4px 0', borderRadius: 4, border: '1px solid #3f3f46', cursor: 'pointer',
                    background: props.level === l ? '#3b82f6' : '#27272a', color: props.level === l ? '#fff' : '#a1a1aa',
                    fontSize: 12, fontWeight: 600,
                  }}
                >{l.toUpperCase()}</button>
              ))}
            </div>
          </div>
          <div>
            <label style={{ fontSize: 11, fontWeight: 600, color: '#a1a1aa', display: 'block', marginBottom: 6, textTransform: 'uppercase', letterSpacing: '0.3px' }}>Text</label>
            <input
              type="text"
              value={props.text || ''}
              onChange={(e) => setProp((p: HeadingProps) => { p.text = e.target.value; })}
              style={{ width: '100%', padding: '6px 8px', background: '#27272a', color: '#e4e4e7', border: '1px solid #3f3f46', borderRadius: 4, fontSize: 13 }}
            />
          </div>
        </div>
      }
      style={
        <TypographyControl
          style={props.style || {}}
          onChange={(updates) => setProp((p: HeadingProps) => { p.style = { ...p.style, ...updates }; })}
        />
      }
      advanced={
        <AdvancedTab
          style={props.style || {}}
          onStyleChange={(updates) => setProp((p: HeadingProps) => { p.style = { ...p.style, ...updates }; })}
          cssId={props.cssId || ''}
          onCssIdChange={(id) => setProp((p: HeadingProps) => { p.cssId = id; })}
          cssClass={props.cssClass || ''}
          onCssClassChange={(cls) => setProp((p: HeadingProps) => { p.cssClass = cls; })}
          hideOnDesktop={props.hideOnDesktop}
          onHideOnDesktopChange={(v) => setProp((p: HeadingProps) => { p.hideOnDesktop = v; })}
          hideOnTablet={props.hideOnTablet}
          onHideOnTabletChange={(v) => setProp((p: HeadingProps) => { p.hideOnTablet = v; })}
          hideOnMobile={props.hideOnMobile}
          onHideOnMobileChange={(v) => setProp((p: HeadingProps) => { p.hideOnMobile = v; })}
          animation={props.animation}
          onAnimationChange={(v) => setProp((p: HeadingProps) => { p.animation = v; })}
          animationDelay={props.animationDelay}
          onAnimationDelayChange={(v) => setProp((p: HeadingProps) => { p.animationDelay = v; })}
        />
      }
    />
  );
};

Heading.craft = {
  displayName: 'Heading',
  props: {
    text: 'Your Heading',
    level: 'h2' as HeadingLevel,
    style: {
      fontSize: '36px',
      fontWeight: '700',
      fontFamily: 'Inter, sans-serif',
      color: '#1f2937',
      marginBottom: '16px',
    },
  },
  rules: {
    canDrag: () => true,
    canMoveIn: () => false,
    canMoveOut: () => true,
  },
  related: {
    settings: HeadingSettings,
  },
};

(Heading as any).toHtml = (props: HeadingProps, _childrenHtml: string) => {
  const tag = props.level || 'h2';
  const safeText = (props.text || '').replace(/</g, '&lt;').replace(/>/g, '&gt;');
  const styleStr = cssPropsToString(props.style);
  return { html: `<${tag}${styleStr ? ` style="${styleStr}"` : ''}>${safeText}</${tag}>` };
};
