File Upload

'use client';

import { useState } from 'react';
import { useFileUpload } from '@/components/ui/file-upload';
import { Alert, AlertContent, AlertDescription, AlertIcon, AlertTitle } from '@/components/ui/alert-1';
import { Button } from '@/components/ui/button-1';
import { ImageIcon, TriangleAlert, Upload, XIcon, ZoomInIcon } from 'lucide-react';
import { cn } from '@/lib/utils';

/**
 * Throttles a function to limit its execution to once every specified duration.
 *
 * @param func - The function to throttle.
 * @param limit - The minimum delay in milliseconds between calls.
 * @returns A throttled version of the provided function.
 */
export const throttle = (func: (...args: unknown[]) => void, limit: number): ((...args: unknown[]) => void) => {
  let lastFunc: ReturnType<typeof setTimeout> | null = null;
  let lastRan: number | null = null;

  return function (this: unknown, ...args: unknown[]) {
    if (lastRan === null) {
      func.apply(this, args);
      lastRan = Date.now();
    } else {
      if (lastFunc !== null) {
        clearTimeout(lastFunc);
      }
      lastFunc = setTimeout(
        () => {
          if (Date.now() - (lastRan as number) >= limit) {
            func.apply(this, args);
            lastRan = Date.now();
          }
        },
        limit - (Date.now() - (lastRan as number)),
      );
    }
  };
};

/**
 * Debounces a function to delay its execution until after a specified delay.
 *
 * @param func - The function to debounce.
 * @param wait - The delay in milliseconds.
 * @returns A debounced version of the provided function.
 */
export function debounce<T extends (...args: unknown[]) => unknown>(
  func: T,
  wait: number,
): (...args: Parameters<T>) => void {
  let timeout: NodeJS.Timeout | null = null;

  return function (...args: Parameters<T>): void {
    if (timeout) {
      clearTimeout(timeout);
    }

    timeout = setTimeout(() => {
      func(...args);
    }, wait);
  };
}

/**
 * Generates a unique identifier using the current timestamp and a random number.
 *
 * @returns A string representing the unique ID.
 */
export function uid(): string {
  return (Date.now() + Math.floor(Math.random() * 1000)).toString();
}

/**
 * Extracts initials from a given name.
 *
 * @param name - The full name to extract initials from.
 * @param count - The number of initials to return. Defaults to all initials.
 * @returns A string of initials from the name.
 */
export const getInitials = (name: string | null | undefined, count?: number): string => {
  if (!name || typeof name !== 'string') {
    return '';
  }

  const initials = name
    .split(' ')
    .filter(Boolean)
    .map((part) => part[0].toUpperCase());

  return count && count > 0 ? initials.slice(0, count).join('') : initials.join('');
};

/**
 * Formats a date as a readable string in "Month Day, Year" format.
 *
 * @param input - A date string or timestamp to format.
 * @returns A string formatted as "Month Day, Year".
 */
export function formatDate(input: Date | string | number): string {
  const date = new Date(input);
  return date.toLocaleDateString('en-US', {
    month: 'long',
    day: 'numeric',
    year: 'numeric',
  });
}

/**
 * Formats a date and time as a readable string in "Month Day, Year, Hour:Minute AM/PM" format.
 *
 * @param input - A date string or timestamp to format.
 * @returns A string formatted as "Month Day, Year, Hour:Minute AM/PM".
 */
export function formatDateTime(input: Date | string | number): string {
  const date = new Date(input);
  return date.toLocaleString('en-US', {
    month: 'long',
    day: 'numeric',
    year: 'numeric',
    hour: 'numeric',
    minute: 'numeric',
    hour12: true,
  });
}

/**
 * Formats a number as a currency string.
 *
 * @param amount - The numeric value to format as currency.
 * @param currency - The currency code (e.g., "USD", "EUR"). Defaults to "USD".
 * @param locale - The locale for formatting (e.g., "en-US"). Defaults to "en-US".
 * @returns A string formatted as currency.
 */
export function formatCurrency(amount: number, currency: string = 'USD', locale: string = 'en-US'): string {
  return new Intl.NumberFormat(locale, {
    style: 'currency',
    currency,
  }).format(amount);
}

/**
 * Constructs an absolute URL based on the base application URL.
 *
 * @param path - The relative path to append to the base URL.
 * @returns A string representing the absolute URL.
 */
export function absoluteUrl(path: string): string {
  return `${process.env.NEXT_PUBLIC_APP_URL}${path}`;
}

/**
 * Constructs an absolute URL for media assets.
 *
 * @param path - The relative path to the media asset (e.g., "/media/avatars/1.png").
 * @returns A string representing the absolute URL to the media asset.
 */
export function toAbsoluteUrl(path: string): string {
  // Remove leading slash if present to avoid double slashes
  const cleanPath = path.startsWith('/') ? path.slice(1) : path;
  return `/${cleanPath}`;
}

/**
	Retrieves a list of supported time zones with their labels and values.
	This function fetches the available time zones from the environment,
	formats their offsets (e.g., "GMT+2"), and returns them in a sorted array.
*/
export const getTimeZones = (): { label: string; value: string }[] => {
  // Fetch supported timezones
  const timezones = Intl.supportedValuesOf('timeZone');

  return timezones
    .map((timezone) => {
      const formatter = new Intl.DateTimeFormat('en', {
        timeZone: timezone,
        timeZoneName: 'shortOffset',
      });
      const parts = formatter.formatToParts(new Date());
      const offset = parts.find((part) => part.type === 'timeZoneName')?.value || '';
      const formattedOffset = offset === 'GMT' ? 'GMT+0' : offset;

      return {
        value: timezone,
        label: `(${formattedOffset}) ${timezone.replace(/_/g, ' ')}`,
        numericOffset: parseInt(formattedOffset.replace('GMT', '').replace('+', '') || '0'),
      };
    })
    .sort((a, b) => a.numericOffset - b.numericOffset);
};

/**
 * Generates a URL-friendly slug from a given title.
 * @param title - The title to convert into a slug (e.g., "Write a Proposal")
 * @returns A slug string (e.g., "write-a-proposal")
 */
export function getSlug(title: string): string {
  // Return empty string for invalid input
  if (!title || typeof title !== 'string') {
    return '';
  }

  return title
    .toLowerCase() // Convert to lowercase for consistency
    .trim() // Remove leading/trailing whitespace
    .normalize('NFD') // Normalize unicode (e.g., "é" -> "e")
    .replace(/[\u0300-\u036f]/g, '') // Remove diacritics
    .replace(/[^a-z0-9\s-]/g, '') // Remove special characters except spaces/hyphens
    .replaceAll(/\s+/g, '-') // Replace spaces with single hyphen
    .replace(/-+/g, '-') // Collapse multiple hyphens
    .replace(/^-|-$/g, ''); // Remove leading/trailing hyphens
}

function formatBytes(bytes: number): string {
  const sizes = ['Bytes', 'KB', 'MB', 'GB'];
  if (bytes === 0) return '0 Byte';
  const i = Math.floor(Math.log(bytes) / Math.log(1024));
  return `${parseFloat((bytes / Math.pow(1024, i)).toFixed(2))} ${sizes[i]}`;
}

export function useCopyToClipboard() {
  const [copied, setCopied] = useState(false);

  const copy = async (text: string) => {
    if (!navigator?.clipboard) return false;

    try {
      await navigator.clipboard.writeText(text);
      setCopied(true);
      setTimeout(() => setCopied(false), 2000);
      return true;
    } catch (error) {
      console.error('Failed to copy:', error);
      setCopied(false);
      return false;
    }
  };

  return { copy, copied };
}


interface GalleryUploadProps {
  maxFiles?: number;
  maxSize?: number;
  accept?: string;
  multiple?: boolean;
  className?: string;
  onFilesChange?: (files: FileWithPreview[]) => void;
}

export default function GalleryUpload({
  maxFiles = 10,
  maxSize = 5 * 1024 * 1024, // 5MB
  accept = 'image/*',
  multiple = true,
  className,
  onFilesChange,
}: GalleryUploadProps) {
  const [selectedImage, setSelectedImage] = useState<string | null>(null);

  // Create default images using FileMetadata type
  const defaultImages: FileMetadata[] = [
    {
      id: 'default-1',
      name: 'avatar-1.png',
      size: 44608,
      type: 'image/png',
      url: 'https://cdn.21st.dev/assets/mirror/11/11d956f8b1bf14c55157948c614aab760383cc7685163ed43e25609c7c050266.jpg',
    },

    {
      id: 'default-2',
      name: 'avatar-2.png',
      size: 42144,
      type: 'image/png',
      url: 'https://cdn.21st.dev/assets/mirror/35/3560ff7cbc9e86c333fccefe248e3ea5cdade4e46f6b2fc85d84755896cb2e5a.jpg',
    },
  ];

  const [
    { files, isDragging, errors },
    {
      removeFile,
      clearFiles,
      handleDragEnter,
      handleDragLeave,
      handleDragOver,
      handleDrop,
      openFileDialog,
      getInputProps,
    },
  ] = useFileUpload({
    maxFiles,
    maxSize,
    accept,
    multiple,
    initialFiles: defaultImages,
    onFilesChange,
  });

  const isImage = (file: File | FileMetadata) => {
    const type = file instanceof File ? file.type : file.type;
    return type.startsWith('image/');
  };

  return (
    <div className="flex flex-col gap-5 p-10 w-full mx-auto h-screen justify-center items-center">
      <div className={cn('w-full max-w-4xl', className)}>
        {/* Upload Area */}
        <div
          className={cn(
            'relative rounded-lg border border-dashed p-8 text-center transition-colors',
            isDragging ? 'border-primary bg-primary/5' : 'border-muted-foreground/25 hover:border-muted-foreground/50',
          )}
          onDragEnter={handleDragEnter}
          onDragLeave={handleDragLeave}
          onDragOver={handleDragOver}
          onDrop={handleDrop}
        >
          <input {...getInputProps()} className="sr-only" />

          <div className="flex flex-col items-center gap-4">
            <div
              className={cn(
                'flex h-16 w-16 items-center justify-center rounded-full',
                isDragging ? 'bg-primary/10' : 'bg-muted',
              )}
            >
              <ImageIcon className={cn('h-5 w-5', isDragging ? 'text-primary' : 'text-muted-foreground')} />
            </div>

            <div className="space-y-2">
              <h3 className="text-lg font-semibold">Upload images to gallery</h3>
              <p className="text-sm text-muted-foreground">Drag and drop images here or click to browse</p>
              <p className="text-xs text-muted-foreground">
                PNG, JPG, GIF up to {formatBytes(maxSize)} each (max {maxFiles} files)
              </p>
            </div>

            <Button onClick={openFileDialog}>
              <Upload className="h-4 w-4" />
              Select images
            </Button>
          </div>
        </div>

        {/* Gallery Stats */}
        {files.length > 0 && (
          <div className="mt-6 flex items-center justify-between">
            <div className="flex items-center gap-4">
              <h4 className="text-sm font-medium">
                Gallery ({files.length}/{maxFiles})
              </h4>
              <div className="text-xs text-muted-foreground">
                Total: {formatBytes(files.reduce((acc, file) => acc + file.file.size, 0))}
              </div>
            </div>
            <Button onClick={clearFiles} variant="outline" size="sm">
              Clear all
            </Button>
          </div>
        )}

        {/* Image Grid */}
        {files.length > 0 && (
          <div className="mt-4 grid grid-cols-2 gap-4 sm:grid-cols-3 md:grid-cols-4">
            {files.map((fileItem) => (
              <div key={fileItem.id} className="group relative aspect-square">
                {isImage(fileItem.file) && fileItem.preview ? (
                  <img
                    src={fileItem.preview}
                    alt={fileItem.file.name}
                    className="h-full w-full rounded-lg border object-cover transition-transform group-hover:scale-105"
                  />
                ) : (
                  <div className="flex h-full w-full items-center justify-center rounded-lg border bg-muted">
                    <ImageIcon className="h-8 w-8 text-muted-foreground" />
                  </div>
                )}

                {/* Overlay */}
                <div className="absolute inset-0 flex items-center justify-center gap-2 rounded-lg bg-black/50 opacity-0 transition-opacity group-hover:opacity-100">
                  {/* View Button */}
                  {fileItem.preview && (
                    <Button
                      onClick={() => setSelectedImage(fileItem.preview!)}
                      variant="secondary"
                      size="icon"
                      className="size-7"
                    >
                      <ZoomInIcon className="opacity-100/80" />
                    </Button>
                  )}

                  {/* Remove Button */}
                  <Button onClick={() => removeFile(fileItem.id)} variant="secondary" size="icon" className="size-7">
                    <XIcon className="opacity-100/80" />
                  </Button>
                </div>

                {/* File Info */}
                <div className="absolute bottom-0 left-0 right-0 rounded-b-lg bg-black/70 p-2 text-white opacity-0 transition-opacity group-hover:opacity-100">
                  <p className="truncate text-xs font-medium">{fileItem.file.name}</p>
                  <p className="text-xs text-gray-300">{formatBytes(fileItem.file.size)}</p>
                </div>
              </div>
            ))}
          </div>
        )}

        {/* Error Messages */}
        {errors.length > 0 && (
          <Alert variant="destructive" appearance="light" className="mt-5">
            <AlertIcon>
              <TriangleAlert />
            </AlertIcon>
            <AlertContent>
              <AlertTitle>File upload error(s)</AlertTitle>
              <AlertDescription>
                {errors.map((error, index) => (
                  <p key={index} className="last:mb-0">
                    {error}
                  </p>
                ))}
              </AlertDescription>
            </AlertContent>
          </Alert>
        )}

        {/* Image Preview Modal */}
        {selectedImage && (
          <div
            className="fixed inset-0 z-50 flex items-center justify-center bg-black/80 backdrop-blur-sm transition-all duration-300 p-4"
            onClick={() => setSelectedImage(null)}
          >
            <div className="relative max-h-full max-w-full">
              <img
                src={selectedImage}
                alt="Preview"
                className="max-h-full max-w-full rounded-lg object-contain"
                onClick={(e) => e.stopPropagation()}
              />
              <Button
                onClick={() => setSelectedImage(null)}
                variant="secondary"
                size="icon"
                className="absolute end-2 top-2 size-7 p-0"
              >
                <XIcon className="h-4 w-4" />
              </Button>
            </div>
          </div>
        )}
      </div>
    </div>
  );
}