import { getToken } from "next-auth/jwt";
import { queryOne, run } from "@/lib/db";

export async function POST(request) {
  try {
    const token = await getToken({
      req: request,
      secret:
        process.env.NEXTAUTH_SECRET ||
        "your-fallback-secret-should-be-at-least-32-chars",
    });

    if (!token) {
      return Response.json({ error: "Unauthorized" }, { status: 401 });
    }

    const userId = token.id;

    const { name } = await request.json();

    if (!name || !name.trim()) {
      return Response.json({ error: "Team name is required" }, { status: 400 });
    }

    const code = generateTeamCode();

    await run(`
      CREATE TABLE IF NOT EXISTS teams (
        id INTEGER PRIMARY KEY AUTOINCREMENT,
        name TEXT NOT NULL,
        code TEXT UNIQUE NOT NULL,
        created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP
      )
    `);

    const existingTeam = await queryOne("SELECT id FROM teams WHERE name = ?", [
      name,
    ]);

    if (existingTeam) {
      return Response.json(
        { error: "Team name already exists" },
        { status: 409 }
      );
    }

    const result = await run("INSERT INTO teams (name, code) VALUES (?, ?)", [
      name,
      code,
    ]);

    const teamId = result.lastID;
    if (!teamId) {
      throw new Error("Failed to create team - no ID returned");
    }

    await run("UPDATE users SET team_id = ? WHERE id = ?", [teamId, userId]);

    return Response.json({
      success: true,
      teamId,
      message: "Team created successfully",
    });
  } catch (error) {
    console.error("Error creating team:", error);
    return Response.json(
      { error: "Failed to create team: " + error.message },
      { status: 500 }
    );
  }
}

function generateTeamCode() {
  const characters = "ABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789";
  let result = "";
  for (let i = 0; i < 6; i++) {
    result += characters.charAt(Math.floor(Math.random() * characters.length));
  }
  return result;
}