diplom-frontend/app/components/ui/icon-upload-field.tsx

import { ImagePlus, RotateCcw, XCircle } from "lucide-react";
import React, { useCallback } from "react";
import type { ControllerRenderProps, FieldError } from "react-hook-form";
import { Button } from "./button";

// Props for our custom field component
interface IconUploadFieldProps {
    field: ControllerRenderProps<any, string>; // field.value can be File | string (URL) | null | undefined
    error?: FieldError;
    accept?: string;
    previewContainerClassName?: string;
    defaultPreview?: string; // Visual fallback URL if field.value is initially undefined
    formDefaultValue?: string | null | undefined; // The actual RHF default value for this field
}

export function IconUploadField({
    field,
    error,
    accept = "image/*",
    previewContainerClassName = "w-24 h-24 rounded-full",
    defaultPreview,
    formDefaultValue, // New prop
}: IconUploadFieldProps) {
    const [previewUrl, setPreviewUrl] = React.useState<string | null>(null);
    const fileInputRef = React.useRef<HTMLInputElement>(null);

    React.useEffect(() => {
        let objectUrlToRevoke: string | null = null;

        if (field.value instanceof File) {
            objectUrlToRevoke = URL.createObjectURL(field.value);
            setPreviewUrl(objectUrlToRevoke);
        } else if (typeof field.value === "string" && field.value) {
            setPreviewUrl(field.value);
        } else if (field.value === null) {
            setPreviewUrl(null);
        } else if (field.value === undefined && defaultPreview) {
            // Show visual default prop if field value is undefined
            setPreviewUrl(defaultPreview);
        } else {
            setPreviewUrl(null);
        }

        return () => {
            if (objectUrlToRevoke) {
                URL.revokeObjectURL(objectUrlToRevoke);
            }
        };
    }, [field.value, defaultPreview]);

    const handleFileChange = (event: React.ChangeEvent<HTMLInputElement>) => {
        const file = event.target.files?.[0];
        field.onChange(file || undefined);
        if (event.target) {
            event.target.value = "";
        }
    };

    const handleRemoveImage = useCallback(
        (e: React.MouseEvent<HTMLButtonElement>) => {
            e.preventDefault();
            field.onChange(null); // Set RHF value to null
            if (fileInputRef.current) {
                fileInputRef.current.value = ""; // Clear the native file input
            }
        },
        [field],
    );

    const handleResetToDefault = useCallback(
        (e: React.MouseEvent<HTMLButtonElement>) => {
            e.preventDefault();
            // The button's visibility logic ensures formDefaultValue is relevant.
            // This will set RHF value to string (URL), null, or undefined, as per formDefaultValue.
            field.onChange(undefined);

            if (fileInputRef.current) {
                fileInputRef.current.value = ""; // Clear the native file input
            }
        },
        [field, formDefaultValue],
    );

    const triggerFileInput = useCallback(() => {
        fileInputRef.current?.click();
    }, []);

    // Visibility for the "Remove" button: show if there's a File or a URL string in field.value
    const showRemoveButton =
        (!!field.value && (field.value instanceof File || typeof field.value === "string")) ||
        (formDefaultValue && field.value === undefined);

    // Visibility for the "Reset to Default" button
    const canReset = typeof formDefaultValue !== "undefined"; // Was a formDefaultValue prop provided?
    // Is current value different from the formDefaultValue?
    // (A File object is always different from a URL string/null/undefined default)
    const isDifferentFromDefault =
        (field.value instanceof File || (field.value !== formDefaultValue && field.value !== undefined)) &&
        formDefaultValue;
    const showResetButton = canReset && isDifferentFromDefault;

    return (
        <div className="flex items-center space-x-4">
            <div
                ref={field.ref}
                className={`relative ${previewContainerClassName} border-2 ${
                    error ? "border-destructive" : "border-dashed border-muted-foreground"
                } flex items-center justify-center cursor-pointer hover:border-primary transition-colors overflow-hidden`}
                onClick={triggerFileInput}
                onKeyDown={(e) => {
                    if (e.key === "Enter" || e.key === " ") {
                        e.preventDefault();
                        triggerFileInput();
                    }
                }}
                role="button"
                tabIndex={0}
                aria-label={previewUrl ? "Change icon" : "Upload icon"}
                aria-invalid={!!error}
                aria-describedby={error ? `${field.name}-error` : undefined}
            >
                {previewUrl ? (
                    <img src={previewUrl} alt="Icon preview" className="w-full h-full object-cover" />
                ) : (
                    <ImagePlus className={`w-10 h-10 ${error ? "text-destructive" : "text-muted-foreground"}`} />
                )}
                <input
                    type="file"
                    ref={fileInputRef}
                    className="hidden"
                    accept={accept}
                    onChange={handleFileChange}
                    onBlur={field.onBlur}
                    name={field.name}
                />
            </div>

            <div className="flex flex-col space-y-2">
                {/* Optional: A separate button to trigger file input, if needed. */}
                {/* <Button type="button" variant="outline" size="sm" onClick={triggerFileInput}>
                    {previewUrl ? "Change Icon" : "Upload Icon"}
                </Button> */}

                {showRemoveButton && (
                    <Button type="button" variant="destructive" size="sm" onClick={handleRemoveImage}>
                        <XCircle className="mr-2 h-4 w-4" />
                        Remove
                    </Button>
                )}

                {showResetButton && (
                    <Button
                        type="button"
                        variant="outline" // Choose a suitable variant
                        size="sm"
                        onClick={handleResetToDefault}
                    >
                        <RotateCcw className="mr-2 h-4 w-4" />
                        Reset to Default
                    </Button>
                )}
            </div>
        </div>
    );
}