// * Packages
import { usePage } from "@inertiajs/react";
import { FileCheck, RefreshCwIcon, Trash, UploadIcon, EyeIcon } from "lucide-react";
import { ReactNode, useCallback, useEffect, useState } from "react";
import { ErrorCode, FileWithPath, useDropzone } from "react-dropzone";
// * Components shadcn
import { Button } from "@/components/ui/button";
import { Label } from "@/components/ui/label";
// * Other
import BtnOptionnalLinkWithTooltip from "@/back/Components/BtnOptionnalLinkWithTooltip";
import InputError from "@/back/Components/InputError";
import str from "@/hooks/use-string";
import { useToast } from "@/hooks/use-toast";
import useTrans from "@/hooks/use-translations";
import { cn, GetTranslation } from "@/lib/utils";
import { AppEnv } from "@/types/global";

export enum InputFileMimeType {
  JPG = "image/jpeg",
  PNG = "image/png",
  GIF = "image/gif",
  PDF = "application/pdf",
  SVG = "image/svg+xml",
  WEBP = "image/webp",
  DOC = "application/msword",
  DOCX = "application/vnd.openxmlformats-officedocument.wordprocessingml.document",
  XLS = "application/vnd.ms-excel",
  XLSX = "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet",
}

export const MimeTypeExtensions: Record<InputFileMimeType, string[]> = {
  [InputFileMimeType.JPG]: [".jpg", ".jpeg"],
  [InputFileMimeType.PNG]: [".png"],
  [InputFileMimeType.GIF]: [".gif"],
  [InputFileMimeType.PDF]: [".pdf"],
  [InputFileMimeType.SVG]: [".svg"],
  [InputFileMimeType.WEBP]: [".webp"],
  [InputFileMimeType.DOC]: [".doc"],
  [InputFileMimeType.DOCX]: [".docx"],
  [InputFileMimeType.XLS]: [".xls"],
  [InputFileMimeType.XLSX]: [".xlsx"],
};

type FileWithPreview = FileWithPath & {
  preview: string;
  dbPath?: string;
};

type FileValidation = {
  maxFileSize?: string | null;
  acceptedMimeTypes: InputFileMimeType[];
};

type SimpleInputFileProps = FileValidation & {
  name: string;
  value?: string | File | (string | File)[] | null;
  originalData?: string | string[];
  onRefreshFile?: () => void;
  label?: ReactNode | string;
  required?: boolean;
  multiple?: boolean;
  hasRefreshBtn?: boolean;
  parentErrors?: Record<string, string> | null;
  setData: (name: string, value: File | string | (File | string)[] | null) => void;
  hasFile?: (hasFile: boolean) => void;
};

export default function SimpleInputFile(props: Readonly<SimpleInputFileProps>) {
  const {
    value,
    setData,
    originalData,
    name = "defaultName",
    onRefreshFile,
    label = "defaultLabel",
    required = false,
    multiple = false,
    maxFileSize,
    acceptedMimeTypes,
    hasRefreshBtn = true,
    hasFile,
    parentErrors,
  } = props;
  const { toast } = useToast();
  const { errors } = usePage().props;
  const { url } = usePage().props.appEnv as AppEnv;
  const [accept, setAccept] = useState<Record<string, Array<string>>>({});
  const [extensions, setExtensions] = useState<string>("");
  const [selectedFiles, setSelectedFiles] = useState<FileWithPreview[]>([]);

  const isRefreshDisabled = multiple
    ? (Array.isArray(value) && value.every(v => typeof v === "string"))
    : (value != null && typeof value === "string");

  const localErrors = parentErrors ?? errors;

  const localMaxFileSize = maxFileSize
    ? Number.parseInt(maxFileSize, 10) * 1024
    : 50000;

  const getFileNameFromPath = useCallback((path?: string | null): string | null => {
    if (!path || typeof path !== "string") return null;
    const cleanPath = path.replace(/\/+$/, "");
    const segments = cleanPath.split("/");
    const last = segments.at(-1) || "";
    return last || null;
  }, []);

  const transValueIntoFile = useCallback((localData: string | undefined | null) => {
    if (localData) {
      const currentFileName = getFileNameFromPath(localData);
      return {
        preview: `${url}/${localData}`,
        name: currentFileName ?? "",
        dbPath: localData,
      } as FileWithPreview;
    }
    return null;
  }, [getFileNameFromPath, url]);

  const resolveFile = useCallback((v: string | File, prev: FileWithPreview[]): FileWithPreview | null => {
    if (v instanceof File) {
      const existing = prev.find((f) => f === v);
      if (existing) return existing;

      return Object.assign(v, {
        preview: URL.createObjectURL(v),
      }) as FileWithPreview;
    }

    const existingPath = prev.find((f) => f.dbPath === v);
    if (existingPath) return existingPath;

    return transValueIntoFile(v);
  }, [transValueIntoFile]);

  useEffect(() => {
    let vals: (string | File)[] = [];
    if (Array.isArray(value)) {
      vals = value;
    } else if (value) {
      vals = [value];
    }

    setSelectedFiles((prev) => {
      const newSelected = vals.map((v) => resolveFile(v, prev));
      return newSelected.filter((item): item is FileWithPreview => Boolean(item));
    });
  }, [value, resolveFile]);

  useEffect(() => {
    return () => {
      selectedFiles.forEach(f => {
        if (f.preview?.startsWith("blob:")) {
          URL.revokeObjectURL(f.preview);
        }
      });
    };
  }, []);

  const formatFileSize = (bytes: number): string => {
    if (bytes === 0) return "0 Bytes";
    const k = 1024;
    const sizes = ["Bytes", "KB", "MB", "GB"];
    const i = Math.floor(Math.log(bytes) / Math.log(k));
    const currentSize = sizes[i];
    const currentBytes = Number.parseFloat((bytes / k ** i).toFixed(2));
    return `${currentBytes} ${currentSize}`;
  };

  const transSelectFileZone = useTrans("uwil-backend::back.image_cropper.select_file_zone");
  const transValidationAllFormats = str(
    useTrans("uwil-backend::back.image_cropper.validation.all_formats"),
  ).ucFirst().value();
  const transCancel = useTrans("uwil-backend::back.cancel");
  const transPreview = useTrans("uwil-backend::back.preview");
  const transRulesWeight = useTrans("uwil-backend::back.image_cropper.validation.rules_weight", {
    params: { size: formatFileSize(localMaxFileSize).toString() },
  });
  const transRefresh = useTrans("uwil-backend::back.image_cropper.refresh_original");

  const getTransValidationAllowedFormats = (targetExtensions: string) => {
    return str(
      GetTranslation("uwil-backend::back.image_cropper.validation.allowed_formats", {
        params: { formats: targetExtensions },
      }),
    ).ucFirst().value();
  };

  const buildDropzoneAccept = useCallback(() => {
    const currentAccept: Record<string, string[]> = {};
    const exts: string[] = [];

    acceptedMimeTypes.forEach((mime) => {
      const mimeExts = MimeTypeExtensions[mime];
      if (mimeExts) {
        currentAccept[mime] = mimeExts;
        exts.push(...mimeExts.map(e => e.replace(".", "")));
      }
    });

    setExtensions(Array.from(new Set(exts)).join(", "));
    setAccept(currentAccept);
  }, [acceptedMimeTypes]);

  useEffect(() => {
    buildDropzoneAccept();
  }, [buildDropzoneAccept]);

  useEffect(() => {
    hasFile?.(selectedFiles.length > 0);
  }, [selectedFiles.length, hasFile]);

  const dropErrorMessages = {
    noFile: str(useTrans("uwil-backend::back.image_cropper.toast.no_file")).ucFirst().value(),
    tooLarge: str(useTrans("uwil-backend::back.image_cropper.toast.too_big", {
      params: { maxSize: formatFileSize(localMaxFileSize) },
    })).ucFirst().value(),
    forbidden: str(useTrans("uwil-backend::back.image_cropper.toast.forbidden_file")).ucFirst().value(),
    tooMany: str(useTrans("uwil-backend::back.image_cropper.toast.too_many")).ucFirst().value(),
    default: str(useTrans("uwil-backend::back.image_cropper.toast.defaultError")).ucFirst().value(),
  };

  const onDrop = useCallback(
    (acceptedFiles: FileWithPath[]) => {
      if (!acceptedFiles.length) {
        toast({ title: "Oups !", description: dropErrorMessages.noFile });
        return;
      }

      const newFiles = acceptedFiles.map(file => Object.assign(file, {
        preview: URL.createObjectURL(file),
      }) as FileWithPreview);

      if (multiple) {
        const nextFiles = [...selectedFiles, ...newFiles];
        setSelectedFiles(nextFiles);
        setData(name, nextFiles.map(f => f.dbPath || (f as File)));
      } else {
        setSelectedFiles([newFiles[0]]);
        setData(name, newFiles[0]);
      }
    },
    [multiple, selectedFiles, localMaxFileSize, formatFileSize, name, setData],
  );

  const { getRootProps, getInputProps } = useDropzone({
    onDrop,
    accept,
    multiple,
    maxSize: localMaxFileSize,
    onDropRejected: (fileRejections) => {
      const rejection = fileRejections[0];
      const rejectionCode = rejection?.errors?.[0]?.code;
      if (rejectionCode === ErrorCode.FileTooLarge) {
        toast({ title: "Oups !", description: `${dropErrorMessages.tooLarge} (${formatFileSize(rejection.file.size)}).` });
      } else if (rejectionCode === ErrorCode.FileInvalidType) {
        toast({ title: "Oups !", description: dropErrorMessages.forbidden });
      } else if (rejectionCode === ErrorCode.TooManyFiles) {
        toast({ title: "Oups !", description: dropErrorMessages.tooMany });
      } else {
        toast({ title: "Oups !", description: dropErrorMessages.default });
      }
    },
  });

  function onButtonClickSingleFile(index: number): React.MouseEventHandler<HTMLButtonElement> {
    return (_: React.MouseEvent<HTMLButtonElement>): void  => {
      const newFiles = selectedFiles.filter((_, i) => i !== index);
      setSelectedFiles(newFiles);
      if (multiple) {
        setData(name, newFiles.length > 0 ? newFiles.map(f => f.dbPath || (f as File)) : []);
      } else {
        setData(name, null);
      }
    }
  }

    function onButtonClickMultipleFiles(originalData: string | string[]): React.MouseEventHandler<HTMLButtonElement> {
    return (_: React.MouseEvent<HTMLButtonElement>):void => {
      const orig = Array.isArray(originalData) ? originalData : [originalData];
      const files = orig.map(transValueIntoFile).filter(v => v !== null);
      setSelectedFiles(files);
      setData(name, multiple ? orig : originalData);
      if (onRefreshFile) {
        onRefreshFile();
      }
    }
  }

  return (
    <div className="flex flex-col gap-1.5 w-full">
      <div className="w-full flex gap-1 items-end">
        <div className="w-full">
          <Label htmlFor={name}>
            {label}
            {required && " *"}
          </Label>
          {selectedFiles.length > 0 ? (
            <div className="relative mt-1.5 flex flex-col gap-2">
              {selectedFiles.map((file, index) => (
                <div key={file.name + index} className="relative">
                  <div className="text-sm flex justify-center border border-dashed rounded-md overflow-hidden whitespace-normal [&_svg]:!size-auto [&_svg]:!shrink text-muted-foreground w-full h-16 bg-background/50">
                    <div className="flex flex-row justify-center items-center gap-2 px-4 text-center">
                      <FileCheck className="w-6 h-6 text-primary" />
                      <small className="max-w-[90%] truncate block text-muted-foreground">{file.name}</small>
                    </div>
                  </div>
                  <div className="absolute top-1/2 right-2 -translate-y-1/2 flex items-center gap-1">
                    {file.preview && (
                      <BtnOptionnalLinkWithTooltip
                        link={file.preview}
                        externalLink={true}
                        variant="secondary"
                        content={<EyeIcon className="w-4 h-4 m-auto" />}
                        tooltipContent={str(transPreview !== "uwil-backend::back.preview" ? transPreview : "Aperçu").ucFirst().value()}
                      />
                    )}
                    <BtnOptionnalLinkWithTooltip
                      variant="destructive"
                      content={<Trash className="w-4 h-4 m-auto" />}
                      onClick={onButtonClickSingleFile(index)}
                      tooltipContent={str(transCancel).ucFirst().value()}
                    />
                  </div>
                </div>
              ))}

              {multiple && (
                <Button
                  variant="ghost"
                  type="button"
                  className={cn(
                    "flex mt-1.5 border border-dashed rounded-md overflow-hidden whitespace-normal [&_svg]:!pointer-events-auto [&_svg]:!size-auto [&_svg]:!shrink text-muted-foreground w-full h-24 hover:bg-accent/50",
                  )}
                  {...getRootProps()}
                >
                  <input name={name} {...getInputProps()} />
                  <div className="flex flex-col justify-center items-center gap-2">
                    <UploadIcon className="w-6 h-6 mb-1 opacity-70" />
                    <p className="text-center break-normal w-full mt-1 font-medium text-xs">
                      {transSelectFileZone}
                    </p>
                  </div>
                </Button>
              )}
            </div>
          ) : (
            <Button
              variant="ghost"
              type="button"
              className={cn(
                "flex mt-1.5 border border-dashed rounded-md overflow-hidden whitespace-normal [&_svg]:!pointer-events-auto [&_svg]:!size-auto [&_svg]:!shrink text-muted-foreground w-full h-36 hover:bg-accent/50",
                { "border-destructive": localErrors[name] },
              )}
              {...getRootProps()}
            >
              <input name={name} {...getInputProps()} />
              <div className="flex flex-col justify-center items-center gap-2">
                <UploadIcon className="w-6 h-6 mb-1 opacity-70" />
                <p className="text-center break-normal w-full mt-1 font-medium">
                  {transSelectFileZone}
                </p>
                <small className="text-center opacity-70">
                  {extensions ? getTransValidationAllowedFormats(extensions) : transValidationAllFormats}
                  . {str(transRulesWeight).ucFirst().value()}
                </small>
              </div>
            </Button>
          )}
        </div>

        {hasRefreshBtn && originalData && (
          <BtnOptionnalLinkWithTooltip
            disabled={isRefreshDisabled}
            className="h-36 mt-1.5"
            variant="secondary"
            onClick={onButtonClickMultipleFiles(originalData)}
            content={<RefreshCwIcon />}
            tooltipContent={str(transRefresh).ucFirst().value()}
          />
        )}
      </div>
      <InputError message={localErrors[name]} />
    </div>
  );
}