import { NextRequest, NextResponse } from "next/server"
import { auth } from "@/lib/auth"
import { db } from "@/lib/db"
import bcrypt from "bcryptjs"

export async function POST(req: NextRequest) {
  try {
    const session = await auth()
    if (!session?.user?.id) {
      return NextResponse.json({ error: "Unauthorized" }, { status: 401 })
    }

    const { currentPassword, newPassword } = await req.json()

    if (!currentPassword || !newPassword) {
      return NextResponse.json({ error: "Both fields are required" }, { status: 400 })
    }

    if (newPassword.length < 6) {
      return NextResponse.json({ error: "New password must be at least 6 characters" }, { status: 400 })
    }

    const user = await db.user.findUnique({
      where: { id: session.user.id },
      select: { id: true, password: true },
    })

    if (!user) {
      return NextResponse.json({ error: "User not found" }, { status: 404 })
    }

    const isValid = await bcrypt.compare(currentPassword, user.password)
    if (!isValid) {
      return NextResponse.json({ error: "Current password is incorrect" }, { status: 400 })
    }

    const hashed = await bcrypt.hash(newPassword, 12)
    await db.user.update({
      where: { id: user.id },
      data: { password: hashed },
    })

    return NextResponse.json({ success: true })
  } catch (err) {
    return NextResponse.json(
      { error: err instanceof Error ? err.message : "Unknown error" },
      { status: 500 }
    )
  }
}