import { NextRequest, NextResponse } from 'next/server';
import { z } from 'zod';
import { prisma } from '@/lib/db';
import { hashPassword, signToken, setSessionCookie } from '@/lib/auth';
import { provisionGHLForUser } from '@/lib/ghl';
import { adminTaggingService } from '@/lib/ghl';
import { Role } from '@/types';

const signupSchema = z.object({
  email: z.string().email(),
  password: z.string().min(8),
  firstName: z.string().min(1),
  lastName: z.string().min(1),
});

export async function POST(request: NextRequest) {
  try {
    const body = await request.json();
    const validated = signupSchema.parse(body);

    // Check if user already exists
    const existingUser = await prisma.user.findUnique({
      where: { email: validated.email },
    });

    if (existingUser) {
      return NextResponse.json(
        { error: 'User with this email already exists' },
        { status: 409 }
      );
    }

    // Hash password
    const passwordHash = await hashPassword(validated.password);

    // Create user
    const user = await prisma.user.create({
      data: {
        email: validated.email,
        passwordHash,
        firstName: validated.firstName,
        lastName: validated.lastName,
        role: Role.USER,
      },
    });

    // Create initial setup status
    await prisma.setupStatus.create({
      data: { userId: user.id },
    });

    // Provision GHL sub-account (async, don't block signup)
    provisionGHLForUser({
      userId: user.id,
      email: user.email,
      firstName: validated.firstName,
      lastName: validated.lastName,
    }).catch(err => console.error('GHL provisioning failed:', err));

    // Generate token
    const token = signToken({
      userId: user.id,
      email: user.email,
      role: user.role as Role,
    });

    // Set session cookie
    await setSessionCookie(token);

    return NextResponse.json({
      success: true,
      user: {
        id: user.id,
        email: user.email,
        firstName: user.firstName,
        lastName: user.lastName,
        role: user.role,
      },
      token,
    }, { status: 201 });
  } catch (error) {
    if (error instanceof z.ZodError) {
      return NextResponse.json(
        { error: 'Validation failed', details: error.issues },
        { status: 400 }
      );
    }
    console.error('Signup error:', error);
    return NextResponse.json(
      { error: 'Internal server error' },
      { status: 500 }
    );
  }
}