"use server"

import { writeFile, mkdir } from "fs/promises"
import { join } from "path"
import { v4 as uuidv4 } from "uuid"

export async function uploadImage(data: FormData) {
    const file: File | null = data.get("file") as unknown as File

    if (!file) {
        throw new Error("No file uploaded")
    }

    const bytes = await file.arrayBuffer()
    const buffer = Buffer.from(bytes)

    // Validate mime type (basic check)
    if (!file.type.startsWith("image/")) {
        throw new Error("Only images are allowed")
    }

    // Create uploads directory if it doesn't exist
    // We organize by generic uploads folder for now, or per plan?
    // Let's optimize for simplicity: /public/uploads/YYYY/MM

    const now = new Date()
    const year = now.getFullYear()
    const month = String(now.getMonth() + 1).padStart(2, '0')
    const params = data.get("planId") ? String(data.get("planId")) : "misc"

    // Use /uploads/planId/ to keep it somewhat organized or cleanup-able
    const relativeDir = join("uploads", params)
    const uploadDir = join(process.cwd(), "public", relativeDir)

    try {
        await mkdir(uploadDir, { recursive: true })
    } catch (e) {
        // ignore if exists
    }

    // Generate filename
    const ext = file.name.split('.').pop() || "jpg"
    const filename = `${uuidv4()}.${ext}`
    const filepath = join(uploadDir, filename)

    await writeFile(filepath, buffer)

    // Return the public URL
    return `/${relativeDir}/${filename}`
}