import { Elysia, t } from "elysia";
import { join } from "path";
import { mkdir } from "fs/promises";

export const uploadRoute = new Elysia({ prefix: "/upload" })
  .post("/", async ({ body, set }) => {
    const { file } = body as { file: File };
    
    if (!file) {
      set.status = 400;
      return { error: "No file uploaded" };
    }

    // Validate file type
    if (!file.type.startsWith("image/")) {
      set.status = 400;
      return { error: "Only image files are allowed" };
    }

    console.log(`[Upload] Processing: ${file.name} (${(file.size / 1024).toFixed(2)} KB, ${file.type})`);

    // Generate unique filename
    const ext = file.name.split(".").pop();
    const filename = `${crypto.randomUUID()}.${ext}`;
    const uploadDir = join(process.cwd(), "public", "uploads");
    const filePath = join(uploadDir, filename);

    try {
      // Ensure directory exists
      await mkdir(uploadDir, { recursive: true });
      
      // Write file using Bun.write
      await Bun.write(filePath, await file.arrayBuffer());
      
      const APP_URL = process.env.APP_URL || "http://localhost:3000";
      const publicUrl = `${APP_URL}/uploads/${filename}`;
      
      console.log(`[Upload] Success: ${filename} -> ${publicUrl}`);

      return { 
        success: true, 
        url: publicUrl,
        filename 
      };
    } catch (err) {
      console.error("[Upload] Error:", err);
      set.status = 500;
      return { error: "Failed to save file" };
    }
  }, {
    body: t.Object({
      file: t.File({
        maxSize: '5m',
        type: ['image/jpeg', 'image/png', 'image/webp', 'image/gif']
      })
    }),
    detail: {
      summary: "Upload product image",
      tags: ["upload"]
    }
  });