'use client';

import { useEffect, useState } from 'react';
import Link from 'next/link';
import {
  CloudUpload,
  Download,
  FileArchiveIcon,
  FileSpreadsheetIcon,
  FileTextIcon,
  HeadphonesIcon,
  ImageIcon,
  RefreshCwIcon,
  Trash2,
  TriangleAlert,
  Upload,
  VideoIcon,
} from 'lucide-react';
import { toAbsoluteUrl } from '@/lib/helpers';
import { cn } from '@/lib/utils';
import { formatBytes, useFileUpload } from '@/hooks/use-file-upload';
import {
  Alert,
  AlertContent,
  AlertDescription,
  AlertIcon,
  AlertTitle,
} from '@/components/ui/alert';
import { Badge } from '@/components/ui/badge';
import { Button } from '@/components/ui/button';
import { Card, CardContent, CardHeader, CardTitle } from '@/components/ui/card';
import {
  Table,
  TableBody,
  TableCell,
  TableHead,
  TableHeader,
  TableRow,
} from '@/components/ui/table';

export function CompanyDocuments({
  maxFiles = 10,
  maxSize = 50 * 1024 * 1024, // 50MB
  accept = '*',
  multiple = true,
  onFilesChange,
  simulateUpload = true,
}) {
  // Create default files using FileMetadata type
  const defaultFiles = [
    {
      id: 'default-doc-1',
      name: 'document.pdf',
      size: 529254,
      type: 'application/pdf',
      url: toAbsoluteUrl('/media/files/document.pdf'),
    },
    {
      id: 'default-doc-2',
      name: 'intro.zip',
      size: 252846,
      type: 'application/zip',
      url: toAbsoluteUrl('/media/files/intro.zip'),
    },
    {
      id: 'default-doc-3',
      name: 'conclusion.xlsx',
      size: 353126,
      type: 'application/vnd.openxmlformats-officedocument.spreadsheetml.sheet',
      url: toAbsoluteUrl('/media/files/conclusion.xlsx'),
    },
    {
      id: 'default-doc-4',
      name: 'package.json',
      size: 697,
      type: 'application/json',
      url: toAbsoluteUrl('/media/files/package.json'),
    },
  ];

  // Convert default files to FileUploadItem format
  const defaultUploadFiles = defaultFiles.map((file) => ({
    id: file.id,
    file: {
      name: file.name,
      size: file.size,
      type: file.type,
    },
    preview: file.url,
    progress: 100,
    status: 'completed',
  }));

  const [uploadFiles, setUploadFiles] = useState(defaultUploadFiles);

  const [
    { isDragging, errors },
    {
      removeFile,
      clearFiles,
      handleDragEnter,
      handleDragLeave,
      handleDragOver,
      handleDrop,
      openFileDialog,
      getInputProps,
    },
  ] = useFileUpload({
    maxFiles,
    maxSize,
    accept,
    multiple,
    initialFiles: defaultFiles,
    onFilesChange: (newFiles) => {
      // Convert to upload items when files change, preserving existing status
      const newUploadFiles = newFiles.map((file) => {
        // Check if this file already exists in uploadFiles
        const existingFile = uploadFiles.find(
          (existing) => existing.id === file.id,
        );

        if (existingFile) {
          // Preserve existing file status and progress
          return {
            ...existingFile,
            ...file, // Update any changed properties from the file
          };
        } else {
          // New file - set to uploading
          return {
            ...file,
            progress: 0,
            status: 'uploading',
          };
        }
      });
      setUploadFiles(newUploadFiles);
      onFilesChange?.(newFiles);
    },
  });

  // Simulate upload progress
  useEffect(() => {
    if (!simulateUpload) return;

    const interval = setInterval(() => {
      setUploadFiles((prev) =>
        prev.map((file) => {
          if (file.status !== 'uploading') return file;

          const increment = Math.random() * 15 + 5; // 5-20% increment
          const newProgress = Math.min(file.progress + increment, 100);

          if (newProgress >= 100) {
            // Randomly decide if upload succeeds or fails
            const shouldFail = Math.random() < 0.1; // 10% chance to fail
            return {
              ...file,
              progress: 100,
              status: shouldFail ? 'error' : 'completed',
              error: shouldFail
                ? 'Upload failed. Please try again.'
                : undefined,
            };
          }

          return { ...file, progress: newProgress };
        }),
      );
    }, 500);

    return () => clearInterval(interval);
  }, [simulateUpload]);

  const removeUploadFile = (fileId) => {
    setUploadFiles((prev) => prev.filter((file) => file.id !== fileId));
    removeFile(fileId);
  };

  const retryUpload = (fileId) => {
    setUploadFiles((prev) =>
      prev.map((file) =>
        file.id === fileId
          ? { ...file, progress: 0, status: 'uploading', error: undefined }
          : file,
      ),
    );
  };

  const getFileIcon = (file) => {
    const type = file instanceof File ? file.type : file.type;
    if (type.startsWith('image/')) return <ImageIcon className="size-4" />;
    if (type.startsWith('video/')) return <VideoIcon className="size-4" />;
    if (type.startsWith('audio/')) return <HeadphonesIcon className="size-4" />;
    if (type.includes('pdf')) return <FileTextIcon className="size-4" />;
    if (type.includes('word') || type.includes('doc'))
      return <FileTextIcon className="size-4" />;
    if (type.includes('excel') || type.includes('sheet'))
      return <FileSpreadsheetIcon className="size-4" />;
    if (type.includes('zip') || type.includes('rar'))
      return <FileArchiveIcon className="size-4" />;
    return <FileTextIcon className="size-4" />;
  };

  const getFileTypeLabel = (file) => {
    const type = file instanceof File ? file.type : file.type;
    if (type.startsWith('image/')) return 'Image';
    if (type.startsWith('video/')) return 'Video';
    if (type.startsWith('audio/')) return 'Audio';
    if (type.includes('pdf')) return 'PDF';
    if (type.includes('word') || type.includes('doc')) return 'Word';
    if (type.includes('excel') || type.includes('sheet')) return 'Excel';
    if (type.includes('zip') || type.includes('rar')) return 'Archive';
    if (type.includes('json')) return 'JSON';
    if (type.includes('text')) return 'Text';
    return 'File';
  };

  return (
    <Card>
      <CardHeader className="gap-2" id="settings_set_goal">
        <CardTitle>Company Documents</CardTitle>
      </CardHeader>
      <CardContent className="space-y-5">
        {/* Upload Area */}
        <div
          className={cn(
            'relative rounded-lg border border-dashed p-6 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-12 w-12 items-center justify-center rounded-full bg-muted transition-colors',
                isDragging
                  ? 'border-primary bg-primary/10'
                  : 'border-muted-foreground/25',
              )}
            >
              <Upload className="h-5 w-5 text-muted-foreground" />
            </div>

            <div className="space-y-2">
              <p className="text-sm font-medium">
                Drop files here or{' '}
                <button
                  type="button"
                  onClick={openFileDialog}
                  className="cursor-pointer text-primary underline-offset-4 hover:underline"
                >
                  browse files
                </button>
              </p>
              <p className="text-xs text-muted-foreground">
                Maximum file size: {formatBytes(maxSize)} • Maximum files:{' '}
                {maxFiles}
              </p>
            </div>
          </div>
        </div>

        {/* Files Table */}
        {uploadFiles.length > 0 && (
          <div className="space-y-4">
            <div className="flex items-center justify-between">
              <h3 className="text-sm font-medium">
                Files ({uploadFiles.length})
              </h3>
              <div className="flex gap-2">
                <Button onClick={openFileDialog} variant="outline" size="sm">
                  <CloudUpload />
                  Add files
                </Button>
                <Button onClick={clearFiles} variant="outline" size="sm">
                  <Trash2 />
                  Remove all
                </Button>
              </div>
            </div>

            <div className="kt-scrollable-x-auto rounded-lg border">
              <Table>
                <TableHeader>
                  <TableRow className="text-xs">
                    <TableHead className="h-9">Name</TableHead>
                    <TableHead className="h-9">Type</TableHead>
                    <TableHead className="h-9">Size</TableHead>
                    <TableHead className="h-9 w-[100px] text-end">
                      Actions
                    </TableHead>
                  </TableRow>
                </TableHeader>
                <TableBody>
                  {uploadFiles.map((fileItem) => (
                    <TableRow key={fileItem.id}>
                      <TableCell className="py-2 ps-1.5">
                        <div className="flex items-center gap-1 truncate">
                          <div
                            className={cn(
                              'size-8 shrink-0 relative flex items-center justify-center text-muted-foreground/80',
                            )}
                          >
                            {fileItem.status === 'uploading' ? (
                              <div className="relative">
                                {/* Circular progress background */}
                                <svg
                                  className="size-8 -rotate-90"
                                  viewBox="0 0 32 32"
                                >
                                  <circle
                                    cx="16"
                                    cy="16"
                                    r="14"
                                    fill="none"
                                    stroke="currentColor"
                                    strokeWidth="2"
                                    className="text-muted-foreground/20"
                                  />

                                  {/* Progress circle */}
                                  <circle
                                    cx="16"
                                    cy="16"
                                    r="14"
                                    fill="none"
                                    stroke="currentColor"
                                    strokeWidth="2"
                                    strokeDasharray={`${2 * Math.PI * 14}`}
                                    strokeDashoffset={`${2 * Math.PI * 14 * (1 - fileItem.progress / 100)}`}
                                    className="text-primary transition-all duration-300"
                                    strokeLinecap="round"
                                  />
                                </svg>
                                {/* File icon in center */}
                                <div className="absolute inset-0 flex items-center justify-center">
                                  {getFileIcon(fileItem.file)}
                                </div>
                              </div>
                            ) : (
                              <div className="not-[]:size-8 flex items-center justify-center">
                                {getFileIcon(fileItem.file)}
                              </div>
                            )}
                          </div>
                          <p className="flex items-center gap-1 truncate text-sm font-medium">
                            {fileItem.file.name}
                            {fileItem.status === 'error' && (
                              <Badge
                                variant="destructive"
                                size="sm"
                                appearance="light"
                              >
                                Error
                              </Badge>
                            )}
                          </p>
                        </div>
                      </TableCell>
                      <TableCell className="py-2">
                        <Badge variant="secondary" className="text-xs">
                          {getFileTypeLabel(fileItem.file)}
                        </Badge>
                      </TableCell>
                      <TableCell className="py-2 text-sm text-muted-foreground">
                        {formatBytes(fileItem.file.size)}
                      </TableCell>
                      <TableCell className="py-2 pe-1">
                        <div className="flex items-center gap-1">
                          {fileItem.preview && (
                            <Button
                              variant="dim"
                              size="icon"
                              className="size-8"
                              asChild
                            >
                              <Link href={fileItem.preview} target="_blank">
                                <Download className="size-3.5" />
                              </Link>
                            </Button>
                          )}
                          {fileItem.status === 'error' ? (
                            <Button
                              onClick={() => retryUpload(fileItem.id)}
                              variant="dim"
                              size="icon"
                              className="size-8 text-destructive/80 hover:text-destructive"
                            >
                              <RefreshCwIcon className="size-3.5" />
                            </Button>
                          ) : (
                            <Button
                              onClick={() => removeUploadFile(fileItem.id)}
                              variant="dim"
                              size="icon"
                              className="size-8"
                            >
                              <Trash2 className="size-3.5" />
                            </Button>
                          )}
                        </div>
                      </TableCell>
                    </TableRow>
                  ))}
                </TableBody>
              </Table>
            </div>
          </div>
        )}

        {/* Error Messages */}
        {errors.length > 0 && (
          <Alert variant="destructive" appearance="light">
            <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>
        )}
      </CardContent>
    </Card>
  );
}