import { useEffect, useRef } from 'react';

interface ExpandedPromptEditorProps {
  promptInput: string;
  onPromptChange: (value: string) => void;
  onSubmit: (e: React.FormEvent) => void;
  onClose: () => void;
  disabled: boolean;
  placeholder: string;
  isProcessing: boolean;
  isAborting: boolean;
  onCancel: () => void;
}

export default function ExpandedPromptEditor({
  promptInput,
  onPromptChange,
  onSubmit,
  onClose,
  disabled,
  placeholder,
  isProcessing,
  isAborting,
  onCancel,
}: ExpandedPromptEditorProps) {
  const textareaRef = useRef<HTMLTextAreaElement>(null);

  // Auto-focus the textarea on mount
  useEffect(() => {
    textareaRef.current?.focus();
  }, []);

  const handleKeyDown = (e: React.KeyboardEvent) => {
    // Escape closes the editor
    if (e.key === 'Escape') {
      e.preventDefault();
      onClose();
      return;
    }

    // Ctrl+Enter or Cmd+Enter submits the prompt
    if (e.key === 'Enter' && (e.ctrlKey || e.metaKey)) {
      e.preventDefault();
      if (!disabled && promptInput.trim()) {
        onSubmit(e);
      }
      return;
    }

    // Regular Enter inserts a newline (default textarea behavior)
    // No special handling needed — this is the key difference from the simple prompt bar
  };

  const handleSubmitClick = (e: React.FormEvent) => {
    e.preventDefault();
    if (!disabled && promptInput.trim()) {
      onSubmit(e);
    }
  };

  return (
    <div className="flex-1 flex overflow-hidden">
      {/* Left Sidebar — Tools */}
      <div className="w-48 border-r border-border-subtle bg-bg-secondary flex flex-col shrink-0">
        {/* Sidebar Header */}
        <div className="flex items-center justify-between px-4 py-2 bg-bg-tertiary border-b border-border-subtle shrink-0">
          <span className="text-xs font-medium text-text-secondary uppercase tracking-wider">Tools</span>
        </div>
        {/* Sidebar Content — Placeholder for future tools */}
        <div className="flex-1 overflow-y-auto p-4 space-y-3">
          <div className="text-text-muted text-xs space-y-4">
            <div>
              <div className="flex items-center gap-2 mb-1">
                <svg className="w-3.5 h-3.5 text-text-muted" fill="none" viewBox="0 0 24 24" stroke="currentColor">
                  <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={2} d="M7 8h10M7 12h4m1 8l-4-4H5a2 2 0 01-2-2V6a2 2 0 012-2h14a2 2 0 012 2v8a2 2 0 01-2 2h-3l-4 4z" />
                </svg>
                <span className="text-text-secondary font-medium">Snippets</span>
              </div>
              <p className="pl-5.5 text-text-muted text-[11px] leading-relaxed">
                Quick text snippets for common prompt patterns
              </p>
            </div>
            <div>
              <div className="flex items-center gap-2 mb-1">
                <svg className="w-3.5 h-3.5 text-text-muted" fill="none" viewBox="0 0 24 24" stroke="currentColor">
                  <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={2} d="M19 11H5m14 0a2 2 0 012 2v6a2 2 0 01-2 2H5a2 2 0 01-2-2v-6a2 2 0 012-2m14 0V9a2 2 0 00-2-2M5 11V9a2 2 0 012-2m0 0V5a2 2 0 012-2h6a2 2 0 012 2v2M7 7h10" />
                </svg>
                <span className="text-text-secondary font-medium">Prompt Library</span>
              </div>
              <p className="pl-5.5 text-text-muted text-[11px] leading-relaxed">
                Saved and shared prompt templates
              </p>
            </div>
          </div>
          <div className="pt-4 border-t border-border-subtle">
            <p className="text-text-muted text-[11px] leading-relaxed">
              More tools coming soon...
            </p>
          </div>
        </div>
      </div>

      {/* Main Editor Area */}
      <div className="flex-1 flex flex-col min-w-0">
        {/* Header Bar */}
        <div className="flex items-center justify-between px-4 py-2 bg-bg-tertiary border-b border-border-subtle shrink-0">
          <span className="text-sm font-medium text-text-secondary">Prompt Editor</span>
          <div className="flex items-center gap-2">
            {isProcessing ? (
              <button
                type="button"
                onClick={onCancel}
                disabled={isAborting}
                className="px-4 py-1.5 bg-red-600 text-white rounded hover:bg-red-700 transition-colors disabled:opacity-50 disabled:cursor-not-allowed text-sm"
              >
                {isAborting ? 'Aborting...' : 'Cancel'}
              </button>
            ) : (
              <button
                type="button"
                onClick={handleSubmitClick}
                disabled={disabled || !promptInput.trim()}
                className="px-4 py-1.5 bg-brand text-white rounded hover:bg-brand/80 transition-colors disabled:opacity-50 disabled:cursor-not-allowed text-sm"
              >
                Submit
              </button>
            )}
            <button
              type="button"
              onClick={onClose}
              className="p-1.5 text-text-muted hover:text-text-primary hover:bg-bg-secondary rounded transition-colors"
              title="Close expanded editor (Esc)"
            >
              <svg className="w-4 h-4" fill="none" viewBox="0 0 24 24" stroke="currentColor">
                <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={2} d="M6 18L18 6M6 6l12 12" />
              </svg>
            </button>
          </div>
        </div>

        {/* Textarea */}
        <div className="flex-1 min-h-0 p-4">
          <textarea
            ref={textareaRef}
            value={promptInput}
            onChange={(e) => onPromptChange(e.target.value)}
            onKeyDown={handleKeyDown}
            placeholder={placeholder}
            disabled={disabled}
            className="w-full h-full px-4 py-3 bg-bg-primary border border-border-default rounded font-mono text-sm text-text-primary leading-relaxed focus:border-brand focus:outline-none resize-none disabled:opacity-50"
          />
        </div>

        {/* Footer — Keyboard Shortcuts */}
        <div className="px-4 py-2 text-xs text-text-muted border-t border-border-subtle shrink-0 flex items-center justify-between">
          <span>Esc to close · Ctrl+Enter to send</span>
          <span className="font-mono">{promptInput.length} chars</span>
        </div>
      </div>
    </div>
  );
}