'use client';

import * as storage from '@/lib/storage/storage.external';
import { StorageProvider } from '@/lib/storage/storage.interface';
import { wrap } from '@/utils/types/results';
import { z } from 'zod';

export const FileUploadResp = z.object({
    signedUrl: z.string(),
    key: z.string(),
});
export type FileUploadResp = z.infer<StorageProvider>;

async function hashFile(file: File): Promise<string> {
    const buffer = await file.arrayBuffer();
    const hashBuffer = await crypto.subtle.digest('SHA-256', buffer);
    const hex = Array.from(new Uint8Array(hashBuffer))
        .map((b) => b.toString(16).padStart(2, '0'))
        .join('');
    const ext = file.name.split('.').pop();
    return ext ? `${hex}.${ext}` : hex;
}

export const uploadFile = wrap(async (file: File) => {
    const fileKey = await hashFile(file);

    const existsResult = await storage.checkExists(fileKey);
    if (existsResult) {
        const presignedUrl = await storage.getSignedUrl(fileKey);
        if (!presignedUrl.ok) {
            throw new Error('Failed to retrieve file URL');
        }
        return { signedUrl: presignedUrl.value, key: fileKey };
    }

    const result = await storage.getPutUrl(fileKey, file.type);
    if (!result.ok) {
        throw new Error('File upload failed');
    }

    const response = await fetch(result.value, {
        method: 'PUT',
        headers: { 'Content-Type': file.type },
        body: file,
    });

    if (!response.ok) {
        throw new Error('Failed to upload file');
    }

    const presignedUrl = await storage.getSignedUrl(fileKey);
    if (!presignedUrl.ok) {
        throw new Error('Failed to retrieve file URL');
    }
    return { signedUrl: presignedUrl.value, key: fileKey };
});