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

interface TabItem {
  label: string;
  content: string;
}

interface TabsProps {
  tabs?: TabItem[];
  style?: CSSProperties;
  activeTabBg?: string;
  activeTabColor?: string;
  inactiveTabBg?: string;
  inactiveTabColor?: string;
  contentBg?: string;
  anchorId?: string;
}

const defaultTabs: TabItem[] = [
  { label: 'Overview', content: 'Welcome to our platform. We provide the tools you need to build, launch, and grow your online presence. Our intuitive interface makes it simple to get started in minutes.' },
  { label: 'Features', content: 'Drag-and-drop editor, responsive templates, custom domains, analytics dashboard, SEO tools, and integrations with your favorite services. Everything you need in one place.' },
  { label: 'Support', content: 'Our dedicated support team is available 24/7 to help you with any questions. Access our knowledge base, community forums, or reach out directly via live chat or email.' },
];

export const Tabs: UserComponent<TabsProps> = ({
  tabs = defaultTabs,
  style = {},
  activeTabBg = '#3b82f6',
  activeTabColor = '#ffffff',
  inactiveTabBg = '#f1f5f9',
  inactiveTabColor = '#64748b',
  contentBg = '#ffffff',
  anchorId,
}) => {
  const {
    connectors: { connect, drag },
    selected,
  } = useNode((node) => ({
    selected: node.events.selected,
  }));

  const [activeIndex, setActiveIndex] = useState(0);

  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' }}>
        {/* Tab buttons */}
        <div style={{ display: 'flex', gap: '2px', borderBottom: '2px solid #e2e8f0' }}>
          {tabs.map((tab, i) => (
            <button
              key={i}
              onClick={() => setActiveIndex(i)}
              style={{
                padding: '12px 24px',
                fontSize: '14px',
                fontWeight: '600',
                border: 'none',
                borderTopLeftRadius: '8px',
                borderTopRightRadius: '8px',
                cursor: 'pointer',
                backgroundColor: i === activeIndex ? activeTabBg : inactiveTabBg,
                color: i === activeIndex ? activeTabColor : inactiveTabColor,
                transition: 'background-color 0.2s, color 0.2s',
              }}
            >
              {tab.label}
            </button>
          ))}
        </div>
        {/* Content panel */}
        <div
          style={{
            padding: '24px',
            backgroundColor: contentBg,
            border: '1px solid #e2e8f0',
            borderTop: 'none',
            borderBottomLeftRadius: '8px',
            borderBottomRightRadius: '8px',
            fontSize: '14px',
            lineHeight: '1.7',
            color: '#4b5563',
            minHeight: '100px',
          }}
        >
          {tabs[activeIndex]?.content || ''}
        </div>
      </div>
    </section>
  );
};

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

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

  const tabs = props.tabs || defaultTabs;

  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 updateTab = (index: number, field: keyof TabItem, value: string) => {
    setProp((p: TabsProps) => {
      const updated = [...(p.tabs || defaultTabs)];
      updated[index] = { ...updated[index], [field]: value };
      p.tabs = updated;
    });
  };

  const addTab = () => {
    setProp((p: TabsProps) => {
      p.tabs = [...(p.tabs || defaultTabs), { label: 'New Tab', content: 'Tab content goes here.' }];
    });
  };

  const removeTab = (index: number) => {
    setProp((p: TabsProps) => {
      const updated = [...(p.tabs || defaultTabs)];
      updated.splice(index, 1);
      p.tabs = updated;
    });
  };

  const colorSwatches = ['#3b82f6', '#8b5cf6', '#10b981', '#f59e0b', '#ef4444', '#18181b', '#ffffff', '#f1f5f9'];

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

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

      <div>
        <label style={labelStyle}>Inactive Tab Background</label>
        <div style={{ display: 'flex', gap: 4, flexWrap: 'wrap' }}>
          {['#f1f5f9', '#e2e8f0', '#f8fafc', '#ffffff', '#27272a', '#18181b'].map((c) => (
            <button
              key={c}
              onClick={() => setProp((p: TabsProps) => { p.inactiveTabBg = c; })}
              style={{
                width: 24, height: 24, borderRadius: 4, border: '1px solid #3f3f46',
                backgroundColor: c, cursor: 'pointer',
                outline: props.inactiveTabBg === c ? '2px solid #3b82f6' : 'none',
                outlineOffset: 1,
              }}
            />
          ))}
        </div>
      </div>

      <div>
        <label style={labelStyle}>Inactive Tab Text Color</label>
        <div style={{ display: 'flex', gap: 4, flexWrap: 'wrap' }}>
          {['#64748b', '#94a3b8', '#18181b', '#ffffff'].map((c) => (
            <button
              key={c}
              onClick={() => setProp((p: TabsProps) => { p.inactiveTabColor = c; })}
              style={{
                width: 24, height: 24, borderRadius: 4, border: '1px solid #3f3f46',
                backgroundColor: c, cursor: 'pointer',
                outline: props.inactiveTabColor === 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: TabsProps) => { 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}>Tabs</label>
        <div style={{ display: 'flex', flexDirection: 'column', gap: 8 }}>
          {tabs.map((tab, 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={tab.label} onChange={(e) => updateTab(i, 'label', e.target.value)} placeholder="Label" style={{ ...inputStyle, flex: 1 }} />
                <button
                  onClick={() => removeTab(i)}
                  style={{ padding: '2px 6px', fontSize: 11, background: '#ef4444', color: '#fff', border: 'none', borderRadius: 4, cursor: 'pointer' }}
                >
                  X
                </button>
              </div>
              <textarea
                value={tab.content}
                onChange={(e) => updateTab(i, 'content', e.target.value)}
                placeholder="Content"
                rows={2}
                style={{ ...inputStyle, resize: 'vertical' }}
              />
            </div>
          ))}
        </div>
        <button
          onClick={addTab}
          style={{ marginTop: 6, width: '100%', padding: '6px', fontSize: 11, background: '#27272a', color: '#e4e4e7', border: '1px solid #3f3f46', borderRadius: 4, cursor: 'pointer' }}
        >
          + Add Tab
        </button>
      </div>
    </div>
  );
};

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

Tabs.craft = {
  displayName: 'Tabs',
  props: {
    tabs: defaultTabs,
    style: { backgroundColor: '#ffffff' },
    activeTabBg: '#3b82f6',
    activeTabColor: '#ffffff',
    inactiveTabBg: '#f1f5f9',
    inactiveTabColor: '#64748b',
    contentBg: '#ffffff',
    anchorId: '',
  },
  rules: {
    canDrag: () => true,
    canMoveIn: () => false,
    canMoveOut: () => true,
  },
  related: {
    settings: TabsSettings,
  },
};

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

(Tabs as any).toHtml = (props: TabsProps, _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 tabs = props.tabs || defaultTabs;
  const activeTabBg = props.activeTabBg || '#3b82f6';
  const activeTabColor = props.activeTabColor || '#ffffff';
  const inactiveTabBg = props.inactiveTabBg || '#f1f5f9';
  const inactiveTabColor = props.inactiveTabColor || '#64748b';
  const contentBg = props.contentBg || '#ffffff';

  const tabId = 'tabs_' + Math.random().toString(36).slice(2, 8);

  const tabButtons = tabs.map((tab, i) => {
    const isActive = i === 0;
    return `<button onclick="${tabId}_switch(${i})" id="${tabId}_btn_${i}" style="padding:12px 24px;font-size:14px;font-weight:600;border:none;border-top-left-radius:8px;border-top-right-radius:8px;cursor:pointer;background-color:${isActive ? activeTabBg : inactiveTabBg};color:${isActive ? activeTabColor : inactiveTabColor}">${esc(tab.label)}</button>`;
  }).join('\n      ');

  const tabPanels = tabs.map((tab, i) => {
    return `<div id="${tabId}_panel_${i}" style="padding:24px;background-color:${contentBg};border:1px solid #e2e8f0;border-top:none;border-bottom-left-radius:8px;border-bottom-right-radius:8px;font-size:14px;line-height:1.7;color:#4b5563;min-height:100px;${i !== 0 ? 'display:none' : ''}">${esc(tab.content)}</div>`;
  }).join('\n    ');

  const switchScript = `<script>
function ${tabId}_switch(idx){
  var total=${tabs.length};
  for(var i=0;i<total;i++){
    document.getElementById('${tabId}_panel_'+i).style.display=i===idx?'':'none';
    var btn=document.getElementById('${tabId}_btn_'+i);
    btn.style.backgroundColor=i===idx?'${activeTabBg}':'${inactiveTabBg}';
    btn.style.color=i===idx?'${activeTabColor}':'${inactiveTabColor}';
  }
}
</script>`;

  return {
    html: `<section${idAttr}${sectionStyle ? ` style="${sectionStyle}"` : ''}>
  <div style="max-width:800px;margin:0 auto">
    <div style="display:flex;gap:2px;border-bottom:2px solid #e2e8f0">
      ${tabButtons}
    </div>
    ${tabPanels}
  </div>
  ${switchScript}
</section>`,
  };
};
