// ── Upload: Voice Message ────────────────────────────────────────────────────
// POST /api/upload/voice  — Upload a voice note audio file
//
// Auth: authenticated
// Accepts multipart/form-data with an "audio" file field and "duration" field.
// Saves the file to public/uploads/voice/ with a UUID filename.
// Returns the public URL path and duration for use in chat messages.

import { NextRequest, NextResponse } from "next/server"
import { getSessionUser } from "@/lib/auth"
import { writeFile } from "node:fs/promises"
import { join } from "node:path"
import crypto from "node:crypto"

// ── POST ─────────────────────────────────────────────────────────────────────

export async function POST(request: NextRequest) {
  try {
    const user = await getSessionUser()
    if (!user) return NextResponse.json({ error: "Unauthorized" }, { status: 401 })

    const formData = await request.formData()
    const file = formData.get("audio") as File | null
    if (!file) return NextResponse.json({ error: "No audio file" }, { status: 400 })

    const duration = parseFloat(formData.get("duration")?.toString() || "0")

    // Always use .webm extension (normalize from whatever the client sends)
    const ext = file.name.endsWith(".webm") ? "webm" : "webm"
    const filename = `${crypto.randomUUID()}.${ext}`
    const buffer = Buffer.from(await file.arrayBuffer())
    const savePath = join(process.cwd(), "public", "uploads", "voice", filename)
    await writeFile(savePath, buffer)

    return NextResponse.json({ url: `/uploads/voice/${filename}`, duration })
  } catch (error) {
    console.error("Voice upload error:", error)
    return NextResponse.json({ error: "Upload failed" }, { status: 500 })
  }
}