import { NextResponse } from "next/server";
import { createAdminClient, hasAdminClient } from "@/lib/supabase/admin";
import { formatSignupError } from "@/lib/supabase/auth-errors";
import type { PortalRole } from "@/lib/auth/roles";

type Body = {
  email?: string;
  password?: string;
  displayName?: string;
  portalRole?: PortalRole;
};

function parsePortalRole(value: unknown): PortalRole {
  return value === "league_master" ? "league_master" : "manager";
}

export async function POST(request: Request) {
  if (!hasAdminClient()) {
    return NextResponse.json(
      {
        success: false,
        error:
          "Server signup is not configured. Add SUPABASE_SERVICE_ROLE_KEY to .env.local or use client signup.",
        useClient: true,
      },
      { status: 503 }
    );
  }

  let body: Body;
  try {
    body = await request.json();
  } catch {
    return NextResponse.json(
      { success: false, error: "Invalid JSON body" },
      { status: 400 }
    );
  }

  const email = body.email?.trim().toLowerCase();
  const password = body.password;
  const displayName = body.displayName?.trim() || email?.split("@")[0] || "User";
  const portalRole = parsePortalRole(body.portalRole);

  if (!email || !password) {
    return NextResponse.json(
      { success: false, error: "Email and password are required" },
      { status: 400 }
    );
  }
  if (password.length < 6) {
    return NextResponse.json(
      { success: false, error: "Password must be at least 6 characters" },
      { status: 400 }
    );
  }

  const autoConfirm =
    process.env.SUPABASE_AUTO_CONFIRM_EMAIL === "true" ||
    process.env.NODE_ENV === "development";

  try {
    const admin = createAdminClient();

    const { data: created, error: createError } =
      await admin.auth.admin.createUser({
        email,
        password,
        email_confirm: autoConfirm,
        user_metadata: {
          display_name: displayName,
          portal_role: portalRole,
        },
      });

    if (createError) {
      const message = formatSignupError(createError.message);
      const status = createError.status === 422 ? 422 : 500;
      return NextResponse.json({ success: false, error: message }, { status });
    }

    const userId = created.user?.id;
    if (!userId) {
      return NextResponse.json(
        { success: false, error: "User was not created" },
        { status: 500 }
      );
    }

    const { error: profileError } = await admin.from("profiles").upsert(
      {
        id: userId,
        display_name: displayName,
        portal_role: portalRole,
      },
      { onConflict: "id" }
    );

    if (profileError) {
      return NextResponse.json(
        {
          success: false,
          error: formatSignupError(
            profileError.message.includes("portal_role")
              ? "Database error saving new user"
              : profileError.message
          ),
        },
        { status: 500 }
      );
    }

    return NextResponse.json({
      success: true,
      userId,
      needsEmailConfirmation: !autoConfirm,
      portalRole,
    });
  } catch (e) {
    const message = e instanceof Error ? e.message : "Signup failed";
    return NextResponse.json(
      { success: false, error: formatSignupError(message) },
      { status: 500 }
    );
  }
}