import { NextResponse } from "next/server";
import { ObjectId } from "mongodb";
import { getCollection } from "@/lib/mongodb";
import bcrypt from "bcryptjs";

// GET - Get a single user
export async function GET(
  request: Request,
  { params }: { params: Promise<{ id: string }> }
) {
  try {
    const { id } = await params;

    if (!id || !ObjectId.isValid(id)) {
      return NextResponse.json({ error: "Invalid user ID" }, { status: 400 });
    }

    const usersCollection = await getCollection<any>("users");
    const user = await usersCollection.findOne({ _id: new ObjectId(id) });

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

    return NextResponse.json({
      ...user,
      _id: user._id.toString(),
      password: undefined,
    });
  } catch (error) {
    console.error("Error fetching user:", error);
    return NextResponse.json(
      {
        error: "Failed to fetch user",
        details: error instanceof Error ? error.message : "Unknown error",
      },
      { status: 500 }
    );
  }
}

// PATCH - Update a user
export async function PATCH(
  request: Request,
  { params }: { params: Promise<{ id: string }> }
) {
  try {
    const { id } = await params;

    if (!id || !ObjectId.isValid(id)) {
      return NextResponse.json({ error: "Invalid user ID" }, { status: 400 });
    }

    const body = await request.json();
    const usersCollection = await getCollection<any>("users");

    const existingUser = await usersCollection.findOne({ _id: new ObjectId(id) });
    if (!existingUser) {
      return NextResponse.json({ error: "User not found" }, { status: 404 });
    }

    const updateData: any = {
      updatedAt: new Date().toISOString(),
    };

    if (body.name !== undefined) updateData.name = body.name;
    if (body.email !== undefined) updateData.email = body.email;
    if (body.role !== undefined) updateData.role = body.role;
    if (body.status !== undefined) updateData.status = body.status;
    if (body.phone !== undefined) updateData.phone = body.phone;
    if (body.address !== undefined) updateData.address = body.address;
    if (body.password !== undefined && body.password.trim() !== "") {
      updateData.password = await bcrypt.hash(body.password, 10);
    }

    const result = await usersCollection.updateOne(
      { _id: new ObjectId(id) },
      { $set: updateData }
    );

    if (result.matchedCount === 0) {
      return NextResponse.json({ error: "User not found" }, { status: 404 });
    }

    const updatedUser = await usersCollection.findOne({ _id: new ObjectId(id) });

    return NextResponse.json({
      success: true,
      message: "User updated successfully",
      user: {
        ...updatedUser,
        _id: updatedUser._id.toString(),
        password: undefined,
      },
    });
  } catch (error) {
    console.error("Error updating user:", error);
    return NextResponse.json(
      {
        error: "Failed to update user",
        details: error instanceof Error ? error.message : "Unknown error",
      },
      { status: 500 }
    );
  }
}

// DELETE - Delete a user
export async function DELETE(
  request: Request,
  { params }: { params: Promise<{ id: string }> }
) {
  try {
    const { id } = await params;

    if (!id || !ObjectId.isValid(id)) {
      return NextResponse.json({ error: "Invalid user ID" }, { status: 400 });
    }

    const usersCollection = await getCollection<any>("users");

    const existingUser = await usersCollection.findOne({ _id: new ObjectId(id) });
    if (!existingUser) {
      return NextResponse.json({ error: "User not found" }, { status: 404 });
    }

    const result = await usersCollection.deleteOne({ _id: new ObjectId(id) });

    if (result.deletedCount === 0) {
      return NextResponse.json({ error: "Failed to delete user" }, { status: 500 });
    }

    return NextResponse.json({
      success: true,
      message: "User deleted successfully",
    });
  } catch (error) {
    console.error("Error deleting user:", error);
    return NextResponse.json(
      {
        error: "Failed to delete user",
        details: error instanceof Error ? error.message : "Unknown error",
      },
      { status: 500 }
    );
  }
}