import React from 'react';
import { usePluginToolbarStore, type ToolbarItem } from '@/store/pluginToolbarStore';

function ToolbarButton({ item }: { item: ToolbarItem }) {
  return (
    <button
      onClick={item.onClick}
      disabled={item.disabled}
      className={`
        inline-flex items-center gap-1.5 px-2 py-1 rounded text-xs font-medium
        transition-colors duration-100
        ${item.active ? 'bg-primary-100 text-primary-700' : 'text-secondary-600 hover:bg-secondary-100 hover:text-secondary-900'}
        ${item.disabled ? 'opacity-40 cursor-not-allowed' : 'cursor-pointer'}
      `}
      title={item.label}
    >
      {item.icon && <span className="w-4 h-4 flex-shrink-0">{item.icon}</span>}
      {!item.iconOnly && <span className="hidden sm:inline">{item.label}</span>}
    </button>
  );
}

function ToolbarSearch({ item }: { item: ToolbarItem }) {
  const [expanded, setExpanded] = React.useState(false);
  const [value, setValue] = React.useState('');
  const inputRef = React.useRef<HTMLInputElement>(null);

  const handleToggle = () => {
    if (expanded) {
      // Collapse: clear and close
      setValue('');
      item.onSearch?.('');
      setExpanded(false);
    } else {
      setExpanded(true);
      setTimeout(() => inputRef.current?.focus(), 50);
    }
  };

  const handleChange = (e: React.ChangeEvent<HTMLInputElement>) => {
    setValue(e.target.value);
    item.onSearch?.(e.target.value);
  };

  if (!expanded) {
    return (
      <button
        onClick={handleToggle}
        title={item.label || 'Suchen'}
        aria-label={item.label || 'Suchen'}
        className="inline-flex items-center justify-center p-1.5 rounded text-secondary-600 hover:bg-secondary-100 hover:text-secondary-900 transition-colors cursor-pointer flex-shrink-0"
      >
        <svg className="w-4 h-4" fill="none" stroke="currentColor" strokeWidth={2} viewBox="0 0 24 24">
          <circle cx="11" cy="11" r="7" />
          <line x1="21" y1="21" x2="16.65" y2="16.65" />
        </svg>
      </button>
    );
  }

  return (
    <div className="flex items-center flex-shrink-0">
      <input
        ref={inputRef}
        type="text"
        value={value}
        placeholder={item.searchPlaceholder || 'Suchen...'}
        onChange={handleChange}
        onBlur={() => { if (!value) { setExpanded(false); } }}
        className="w-28 sm:w-40 px-2 py-1 text-xs border border-secondary-200 rounded
          focus:outline-none focus:border-primary-400 focus:ring-1 focus:ring-primary-300
          placeholder:text-secondary-400"
      />
      <button
        onClick={handleToggle}
        className="ml-1 p-1 rounded hover:bg-secondary-100 text-secondary-400 hover:text-secondary-600 transition-colors"
        aria-label="Suche schließen"
      >
        <svg className="w-3.5 h-3.5" fill="none" stroke="currentColor" strokeWidth={2} viewBox="0 0 24 24">
          <line x1="18" y1="6" x2="6" y2="18" />
          <line x1="6" y1="6" x2="18" y2="18" />
        </svg>
      </button>
    </div>
  );
}

function ToolbarDropdown({ item }: { item: ToolbarItem }) {
  const [open, setOpen] = React.useState(false);
  const ref = React.useRef<HTMLDivElement>(null);
  const menuRef = React.useRef<HTMLDivElement>(null);
  const [menuPos, setMenuPos] = React.useState({ top: 0, left: 0 });

  React.useEffect(() => {
    if (!open) return;
    const handler = (e: MouseEvent) => {
      const target = e.target as Node;
      if (ref.current?.contains(target) || menuRef.current?.contains(target)) return;
      setOpen(false);
    };
    document.addEventListener('mousedown', handler);
    return () => document.removeEventListener('mousedown', handler);
  }, [open]);

  const handleToggle = () => {
    if (!open && ref.current) {
      const rect = ref.current.getBoundingClientRect();
      setMenuPos({ top: rect.bottom + 4, left: rect.left });
    }
    setOpen(!open);
  };

  const activeOption = item.menuOptions?.find((o) => o.active);
  let lastSection: string | undefined = undefined;

  return (
    <>
      <div ref={ref} className="relative flex-shrink-0">
        <button
          onClick={handleToggle}
          title={item.label}
          aria-label={item.label}
          className={`
            inline-flex items-center gap-1.5 px-2 py-1 rounded text-xs font-medium
            transition-colors duration-100 cursor-pointer
            ${open || activeOption ? 'bg-primary-100 text-primary-700' : 'text-secondary-600 hover:bg-secondary-100 hover:text-secondary-900'}
          `}
        >
          {item.icon && <span className="w-4 h-4 flex-shrink-0">{item.icon}</span>}
          {!item.iconOnly && <span className="hidden sm:inline">{activeOption?.label || item.label}</span>}
          <svg className={`w-3 h-3 transition-transform ${open ? 'rotate-180' : ''}`} fill="none" stroke="currentColor" strokeWidth={2} viewBox="0 0 24 24">
            <polyline points="6 9 12 15 18 9" />
          </svg>
        </button>
      </div>
      {open && (
        <div
          ref={menuRef}
          className="fixed bg-white border border-secondary-200 rounded-lg shadow-lg py-1"
          style={{
            top: menuPos.top,
            left: menuPos.left,
            minWidth: item.menuWidth || '180px',
            zIndex: 3000,
          }}
        >
          {item.menuOptions?.map((opt) => {
            const showSection = opt.section && opt.section !== lastSection;
            if (showSection) lastSection = opt.section;
            return (
              <React.Fragment key={opt.value}>
                {showSection && (
                  <div className="px-3 pt-2 pb-1 text-[10px] font-semibold uppercase tracking-wide text-secondary-400">
                    {opt.section}
                  </div>
                )}
                {opt.separator && <div className="my-1 border-t border-secondary-100" />}
                <button
                  onClick={() => {
                    opt.onClick();
                    setOpen(false);
                  }}
                  disabled={opt.disabled}
                  className={`
                    w-full flex items-center gap-2 px-3 py-1.5 text-xs text-left transition-colors
                    ${opt.active ? 'bg-primary-50 text-primary-700 font-medium' : 'text-secondary-700 hover:bg-secondary-100'}
                    ${opt.disabled ? 'opacity-40 cursor-not-allowed' : 'cursor-pointer'}
                  `}
                >
                  {opt.icon && <span className="w-4 h-4 flex-shrink-0">{opt.icon}</span>}
                  <span className="flex-1">{opt.label}</span>
                  {opt.active && (
                    <svg className="w-3.5 h-3.5 text-primary-600" fill="none" stroke="currentColor" strokeWidth={2.5} viewBox="0 0 24 24">
                      <polyline points="20 6 9 17 4 12" />
                    </svg>
                  )}
                </button>
              </React.Fragment>
            );
          })}
        </div>
      )}
    </>
  );
}

function ToolbarSelect({ item }: { item: ToolbarItem }) {
  return (
    <select
      value={item.selectValue || ''}
      onChange={(e) => item.onSelect?.(e.target.value)}
      className="px-1.5 sm:px-2 py-1 text-xs border border-secondary-200 rounded
        focus:outline-none focus:border-primary-400 focus:ring-1 focus:ring-primary-300
        bg-white cursor-pointer flex-shrink-0 max-w-[120px] sm:max-w-none"
    >
      {item.selectOptions?.map((opt) => (
        <option key={opt.value} value={opt.value}>{opt.label}</option>
      ))}
    </select>
  );
}

export function PluginToolbar() {
  const { items, activePlugin } = usePluginToolbarStore();
  const visibleItems = items.filter((i) => i.plugin === activePlugin);

  if (visibleItems.length === 0) return null;

  // Group items by group field
  const groups: Record<string, ToolbarItem[]> = {};
  for (const item of visibleItems) {
    const g = item.group || 'default';
    if (!groups[g]) groups[g] = [];
    groups[g].push(item);
  }
  const groupNames = Object.keys(groups);
  const rightGroupNames = groupNames.filter((g) => g.startsWith('zz-right'));
  const leftGroupNames = groupNames.filter((g) => !g.startsWith('zz-right'));

  const renderGroup = (groupName: string, gi: number) => (
    <React.Fragment key={groupName}>
      {gi > 0 && <div className="w-px h-5 bg-secondary-200 mx-1" />}
      <div className="flex items-center gap-1">
        {groups[groupName].map((item) => {
          if (item.type === 'search') return <ToolbarSearch key={item.id} item={item} />;
          if (item.type === 'select') return <ToolbarSelect key={item.id} item={item} />;
          if (item.type === 'dropdown') return <ToolbarDropdown key={item.id} item={item} />;
          if (item.type === 'custom' && item.customComponent) return <React.Fragment key={item.id}>{item.customComponent}</React.Fragment>;
          return <ToolbarButton key={item.id} item={item} />;
        })}
      </div>
    </React.Fragment>
  );

  return (
    <div
      className="flex items-center gap-1 px-2 sm:px-3 py-1.5 bg-white border-b border-secondary-200 min-h-[43px] overflow-visible relative z-30"
      data-testid="plugin-toolbar"
    >
      {leftGroupNames.map((groupName, gi) => renderGroup(groupName, gi))}
      {rightGroupNames.length > 0 && <div className="flex-1" />}
      {rightGroupNames.map((groupName, gi) => renderGroup(groupName, gi))}
    </div>
  );
}