'use client';

import {
  FileUpload,
  FileUploadDropzone,
  FileUploadItem,
  FileUploadItemDelete,
  FileUploadItemMetadata,
  FileUploadItemPreview,
  FileUploadItemProgress,
  FileUploadList,
  FileUploadTrigger,
  type FileUploadProps,
} from '@/components/file-upload';
import { Button } from '@/components/ui/button';
import { Textarea } from '@/components/ui/textarea';
import { cn } from '@/lib/utils';
import { t } from 'i18next';
import { CircleStop, Paperclip, Send, Upload, X } from 'lucide-react';
import * as React from 'react';
import { useCallback, useEffect, useState } from 'react';
import { toast } from 'sonner';
import { AudioButton } from '../ui/audio-button';

interface NextMessageInputProps {
  disabled: boolean;
  value: string;
  sendDisabled: boolean;
  sendLoading: boolean;
  conversationId: string;
  uploadMethod?: string;
  isShared?: boolean;
  showUploadIcon?: boolean;
  isUploading?: boolean;
  onPressEnter({ enableThinking }: { enableThinking: boolean }): void;
  onInputChange: React.ChangeEventHandler<HTMLTextAreaElement>;
  createConversationBeforeUploadDocument?(message: string): Promise<any>;
  stopOutputMessage?(): void;
  onUpload?: NonNullable<FileUploadProps['onUpload']>;
  removeFile?(file: File): void;
  showReasoning?: boolean;
}

export type NextMessageInputOnPressEnterParameter = Parameters<
  NextMessageInputProps['onPressEnter']
>;

export function NextMessageInput({
  isUploading = false,
  value,
  sendDisabled,
  sendLoading,
  disabled,
  showUploadIcon = true,
  onUpload,
  onInputChange,
  stopOutputMessage,
  onPressEnter,
  removeFile,
  showReasoning = false,
}: NextMessageInputProps) {
  const [files, setFiles] = React.useState<File[]>([]);
  const [audioInputValue, setAudioInputValue] = React.useState<string | null>(
    null,
  );

  const [enableThinking, setEnableThinking] = useState(false);

  const handleThinkingToggle = useCallback(() => {
    setEnableThinking((prev) => !prev);
  }, []);

  useEffect(() => {
    if (audioInputValue !== null) {
      onInputChange({
        target: { value: audioInputValue },
      } as React.ChangeEvent<HTMLTextAreaElement>);

      setTimeout(() => {
        onPressEnter({ enableThinking });
        setAudioInputValue(null);
      }, 0);
    }
  }, [audioInputValue, onInputChange, onPressEnter, enableThinking]);

  const onFileReject = React.useCallback((file: File, message: string) => {
    toast(message, {
      description: `"${file.name.length > 20 ? `${file.name.slice(0, 20)}...` : file.name}" has been rejected`,
    });
  }, []);

  const submit = React.useCallback(() => {
    if (isUploading) return;
    onPressEnter({ enableThinking });
    setFiles([]);
  }, [isUploading, onPressEnter, enableThinking]);

  const handleKeyDown = (e: React.KeyboardEvent<HTMLTextAreaElement>) => {
    if (e.key === 'Enter' && !e.shiftKey) {
      e.preventDefault();
      submit();
    }
  };

  const onSubmit = React.useCallback(
    (event: React.FormEvent<HTMLFormElement>) => {
      event.preventDefault();
      submit();
    },
    [submit],
  );

  const handleRemoveFile = React.useCallback(
    (file: File) => () => {
      removeFile?.(file);
    },
    [removeFile],
  );

  return (
    <FileUpload
      value={files}
      onValueChange={setFiles}
      onUpload={onUpload}
      onFileReject={onFileReject}
      className="relative w-full items-center "
      disabled={isUploading || disabled}
    >
      <FileUploadDropzone
        tabIndex={-1}
        // Prevents the dropzone from triggering on click
        onClick={(event) => event.preventDefault()}
        className="absolute top-0 left-0 z-0 flex size-full items-center justify-center rounded-none border-none bg-background/50 p-0 opacity-0 backdrop-blur transition-opacity duration-200 ease-out data-[dragging]:z-10 data-[dragging]:opacity-100"
      >
        <div className="flex flex-col items-center gap-1 text-center">
          <div className="flex items-center justify-center rounded-full border p-2.5">
            <Upload className="size-6 text-muted-foreground" />
          </div>
          <p className="font-medium text-sm">Drag & drop files here</p>
          <p className="text-muted-foreground text-xs">
            Upload max 5 files each up to 5MB
          </p>
        </div>
      </FileUploadDropzone>
      <form
        onSubmit={onSubmit}
        className="relative flex w-full flex-col gap-2.5 rounded-md border border-input px-3 py-2 outline-none focus-within:ring-1 focus-within:ring-ring/50"
      >
        <FileUploadList
          orientation="horizontal"
          className="overflow-x-auto px-0 py-1"
        >
          {files.map((file, index) => (
            <FileUploadItem key={index} value={file} className="max-w-52 p-1.5">
              <FileUploadItemPreview className="size-8 [&>svg]:size-5">
                <FileUploadItemProgress variant="fill" />
              </FileUploadItemPreview>
              <FileUploadItemMetadata size="sm" />
              <FileUploadItemDelete asChild>
                <Button
                  variant="secondary"
                  size="icon"
                  className="-top-1 -right-1 absolute size-4 shrink-0 cursor-pointer rounded-full"
                  onClick={handleRemoveFile(file)}
                >
                  <X className="size-2.5" />
                </Button>
              </FileUploadItemDelete>
            </FileUploadItem>
          ))}
        </FileUploadList>
        <Textarea
          value={value}
          onChange={onInputChange}
          placeholder={t('chat.messagePlaceholder')}
          className="field-sizing-content min-h-10 w-full resize-none border-0 bg-transparent p-0 shadow-none focus-visible:ring-0 dark:bg-transparent"
          disabled={isUploading || disabled || sendLoading}
          onKeyDown={handleKeyDown}
        />
        <div className={cn('flex items-center justify-between gap-1.5')}>
          <div className="flex items-center gap-3">
            {showUploadIcon && (
              <FileUploadTrigger asChild>
                <Button
                  type="button"
                  size="icon"
                  variant="ghost"
                  className="size-7 rounded-sm"
                  disabled={isUploading || sendLoading}
                >
                  <Paperclip className="size-3.5" />
                  <span className="sr-only">Attach file</span>
                </Button>
              </FileUploadTrigger>
            )}
            {showReasoning && (
              <Button
                type="button"
                variant="ghost"
                className={cn(
                  'rounded-sm h-7 focus-visible:bg-none! hover:bg-none!',
                  {
                    'bg-accent-primary text-white': enableThinking,
                  },
                )}
                onClick={handleThinkingToggle}
              >
                <span>Thinking</span>
              </Button>
            )}
          </div>
          {sendLoading ? (
            <Button onClick={stopOutputMessage} className="size-5 rounded-sm">
              <CircleStop />
            </Button>
          ) : (
            <div className="flex items-center gap-3">
              <AudioButton
                onOk={(value) => {
                  setAudioInputValue(value);
                }}
              />
              <Button
                className="size-5 rounded-sm"
                disabled={
                  sendDisabled || isUploading || sendLoading || !value.trim()
                }
              >
                <Send />
                <span className="sr-only">Send message</span>
              </Button>
            </div>
          )}
        </div>
      </form>
    </FileUpload>
  );
}