import React, { useState, useEffect, useCallback } from 'react';

const FONT_SIZE_STORAGE_KEY = 'prompt-editor-font-size';
const DEFAULT_FONT_SIZE = 14;
const MIN_FONT_SIZE = 10;
const MAX_FONT_SIZE = 24;
const FONT_SIZE_OPTIONS = [10, 12, 14, 16, 18, 20, 24];

interface PromptEditorModalProps {
  isOpen: boolean;
  initialPrompt: string;
  onSubmit: (prompt: string) => void;
  onClose: () => void;
}

export const PromptEditorModal: React.FC<PromptEditorModalProps> = ({
  isOpen,
  initialPrompt,
  onSubmit,
  onClose,
}) => {
  const [prompt, setPrompt] = useState(initialPrompt);
  const [showConfirmation, setShowConfirmation] = useState(false);
  const [fontSize, setFontSize] = useState(() => {
    // Load font size from localStorage on mount
    if (typeof window !== 'undefined') {
      const saved = localStorage.getItem(FONT_SIZE_STORAGE_KEY);
      if (saved) {
        const parsed = parseInt(saved, 10);
        if (!isNaN(parsed) && parsed >= MIN_FONT_SIZE && parsed <= MAX_FONT_SIZE) {
          return parsed;
        }
      }
    }
    return DEFAULT_FONT_SIZE;
  });

  // Update local state when initial prompt changes
  useEffect(() => {
    setPrompt(initialPrompt);
  }, [initialPrompt]);

  // Save font size to localStorage when it changes
  useEffect(() => {
    if (typeof window !== 'undefined') {
      localStorage.setItem(FONT_SIZE_STORAGE_KEY, fontSize.toString());
    }
  }, [fontSize]);

  // Track unsaved changes
  const hasUnsavedChanges = prompt !== initialPrompt;

  // Handle close attempt - show confirmation if there are unsaved changes
  const handleAttemptClose = useCallback(() => {
    if (hasUnsavedChanges) {
      setShowConfirmation(true);
    } else {
      onClose();
    }
  }, [hasUnsavedChanges, onClose]);

  // Handle Escape key to close
  useEffect(() => {
    const handleKeyDown = (e: KeyboardEvent) => {
      if (e.key === 'Escape') {
        handleAttemptClose();
      }
    };

    if (isOpen) {
      window.addEventListener('keydown', handleKeyDown);
    }

    return () => {
      window.removeEventListener('keydown', handleKeyDown);
    };
  }, [isOpen, handleAttemptClose]);

  const handleSubmit = useCallback(() => {
    onSubmit(prompt);
    onClose();
  }, [prompt, onSubmit, onClose]);

  const handleFontSizeChange = useCallback((e: React.ChangeEvent<HTMLSelectElement>) => {
    setFontSize(parseInt(e.target.value, 10));
  }, []);

  const handleBackdropClick = useCallback(
    (e: React.MouseEvent<HTMLDivElement>) => {
      // Only close if clicking the backdrop itself, not the dialog content
      if (e.target === e.currentTarget) {
        handleAttemptClose();
      }
    },
    [handleAttemptClose]
  );

  const handleDismissConfirmation = useCallback(() => {
    setShowConfirmation(false);
  }, []);

  const handleConfirmationBackdropClick = useCallback(
    (e: React.MouseEvent<HTMLDivElement>) => {
      // Only dismiss if clicking the backdrop itself, not the confirmation dialog
      if (e.target === e.currentTarget) {
        handleDismissConfirmation();
      }
    },
    [handleDismissConfirmation]
  );

  if (!isOpen) return null;

  return (
    <div
      className="fixed inset-0 z-[100] flex items-center justify-center bg-black/50"
      onClick={handleBackdropClick}
    >
      <div className="relative bg-neutral-800 border border-neutral-700 rounded-lg shadow-2xl w-full max-w-3xl h-[85vh] flex flex-col mx-4">
        {/* Header */}
        <div className="px-6 pt-6 pb-4">
          <h2 className="text-xl font-semibold text-neutral-100">
            Edit Prompt
          </h2>
        </div>

        {/* Box containing toolbar and textarea */}
        <div className="mx-6 flex-1 flex flex-col border border-neutral-700 rounded bg-neutral-900/30 overflow-hidden mb-4">
          {/* Toolbar - header of the box */}
          <div className="h-12 bg-neutral-900 border-b border-neutral-700 flex items-center px-4 gap-3 shrink-0">
            {/* Font Size Control */}
            <select
              value={fontSize}
              onChange={handleFontSizeChange}
              className="text-sm py-1 px-2 border border-neutral-700 rounded bg-neutral-900/50 focus:outline-none focus:ring-1 focus:ring-neutral-600 text-neutral-300"
            >
              {FONT_SIZE_OPTIONS.map((size) => (
                <option key={size} value={size}>
                  {size}px
                </option>
              ))}
            </select>
          </div>

          {/* Textarea */}
          <textarea
            value={prompt}
            onChange={(e) => setPrompt(e.target.value)}
            placeholder="Describe what to generate..."
            className="nodrag nopan nowheel flex-1 w-full p-6 leading-relaxed text-neutral-100 bg-transparent border-0 resize-none focus:outline-none placeholder:text-neutral-500"
            style={{ fontSize: `${fontSize}px` }}
            autoFocus
          />
        </div>

        {/* Footer with buttons */}
        <div className="flex justify-end gap-3 px-6 pb-6">
          <button
            onClick={handleAttemptClose}
            className="px-4 py-2 text-sm font-medium text-neutral-300 bg-neutral-700 hover:bg-neutral-600 rounded transition-colors focus:outline-none focus:ring-1 focus:ring-neutral-500"
          >
            Cancel
          </button>
          <button
            onClick={handleSubmit}
            className="px-4 py-2 text-sm font-medium text-white bg-blue-600 hover:bg-blue-500 rounded transition-colors focus:outline-none focus:ring-1 focus:ring-blue-400"
          >
            Submit
          </button>
        </div>

        {/* Confirmation overlay */}
        {showConfirmation && (
          <div
            className="absolute inset-0 flex items-center justify-center bg-black/60 rounded-lg"
            onClick={handleConfirmationBackdropClick}
          >
            <div className="relative bg-neutral-800 border border-neutral-600 rounded-lg p-6 mx-4 max-w-sm shadow-xl">
              {/* Close button */}
              <button
                onClick={handleDismissConfirmation}
                className="absolute top-3 right-3 text-neutral-400 hover:text-neutral-200 transition-colors focus:outline-none"
                aria-label="Close"
              >
                <svg
                  className="w-5 h-5"
                  fill="none"
                  stroke="currentColor"
                  viewBox="0 0 24 24"
                >
                  <path
                    strokeLinecap="round"
                    strokeLinejoin="round"
                    strokeWidth={2}
                    d="M6 18L18 6M6 6l12 12"
                  />
                </svg>
              </button>

              <p className="text-neutral-100 text-center mb-6">
                You have unsaved changes
              </p>
              <div className="flex justify-center gap-3">
                <button
                  onClick={onClose}
                  className="px-4 py-2 text-sm font-medium text-neutral-300 bg-neutral-700 hover:bg-neutral-600 rounded transition-colors focus:outline-none focus:ring-1 focus:ring-neutral-500"
                >
                  Discard
                </button>
                <button
                  onClick={handleSubmit}
                  className="px-4 py-2 text-sm font-medium text-white bg-blue-600 hover:bg-blue-500 rounded transition-colors focus:outline-none focus:ring-1 focus:ring-blue-400"
                >
                  Submit
                </button>
              </div>
            </div>
          </div>
        )}
      </div>
    </div>
  );
};