import { NextRequest, NextResponse } from "next/server"
import { getServerSession } from "next-auth/next"
import bcrypt from "bcryptjs"
import dbConnect from "@/lib/mongodb"
import User from "@/model/User"
import { authOptions } from "@/lib/auth"
import { updatePasswordSchema } from "@/lib/validation"

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

    const body = await request.json()
    
    const result = updatePasswordSchema.safeParse(body)
    
    if (!result.success) {
      return NextResponse.json(
        { error: "Validation failed", details: result.error.errors },
        { status: 400 }
      )
    }

    const { currentPassword, newPassword } = result.data

    await dbConnect()

    // Get user with current password
    const user = await User.findById(session.user.id)
    
    if (!user) {
      return NextResponse.json(
        { error: "User not found" },
        { status: 404 }
      )
    }

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

    // Hash new password
    const hashedNewPassword = await bcrypt.hash(newPassword, 12)

    // Update password
    await User.findByIdAndUpdate(
      session.user.id,
      { password: hashedNewPassword }
    )

    return NextResponse.json({
      message: "Password updated successfully"
    })

  } catch (error) {
    console.error("Password update error:", error)
    
    return NextResponse.json(
      { error: "Internal server error" },
      { status: 500 }
    )
  }
}