import type { CompanyStatus } from "@prisma/client";
import { type NextRequest, NextResponse } from "next/server";
import {
  getAuthenticatedPlatformUser,
  hasPlatformAccess,
} from "@/lib/auth/server";
import { prisma } from "@/lib/prisma";

// GET /api/platform/companies - List all companies
export async function GET(request: NextRequest) {
  try {
    const { user } = await getAuthenticatedPlatformUser();

    if (!user) {
      return NextResponse.json(
        { error: "Platform access required" },
        { status: 401 }
      );
    }

    const { searchParams } = new URL(request.url);
    const status = searchParams.get("status") as CompanyStatus | null;
    const search = searchParams.get("search");
    const page = Number.parseInt(searchParams.get("page") || "1");
    const limit = Number.parseInt(searchParams.get("limit") || "20");
    const offset = (page - 1) * limit;

    const where: {
      status?: CompanyStatus;
      name?: {
        contains: string;
        mode: "insensitive";
      };
    } = {};
    if (status) where.status = status;
    if (search) {
      where.name = {
        contains: search,
        mode: "insensitive",
      };
    }

    const [companies, total] = await Promise.all([
      prisma.company.findMany({
        where,
        select: {
          id: true,
          name: true,
          status: true,
          createdAt: true,
          updatedAt: true,
          maxUsers: true,
          _count: {
            select: {
              sessions: true,
              imports: true,
              users: true,
            },
          },
        },
        orderBy: { createdAt: "desc" },
        skip: offset,
        take: limit,
      }),
      prisma.company.count({ where }),
    ]);

    return NextResponse.json({
      companies,
      pagination: {
        page,
        limit,
        total,
        pages: Math.ceil(total / limit),
      },
    });
  } catch (error) {
    console.error("Platform companies list error:", error);
    return NextResponse.json(
      { error: "Internal server error" },
      { status: 500 }
    );
  }
}

// POST /api/platform/companies - Create new company
export async function POST(request: NextRequest) {
  try {
    const { user } = await getAuthenticatedPlatformUser();

    if (!user || !hasPlatformAccess(user.role, "PLATFORM_ADMIN")) {
      return NextResponse.json(
        { error: "Admin access required" },
        { status: 403 }
      );
    }

    const body = await request.json();
    const {
      name,
      csvUrl,
      csvUsername,
      csvPassword,
      adminEmail,
      adminName,
      maxUsers = 10,
      status = "TRIAL",
    } = body;

    if (!name || !csvUrl) {
      return NextResponse.json(
        { error: "Name and CSV URL required" },
        { status: 400 }
      );
    }

    if (!adminEmail || !adminName) {
      return NextResponse.json(
        { error: "Admin email and name required" },
        { status: 400 }
      );
    }

    // Create company and admin user placeholder in a transaction
    const result = await prisma.$transaction(async (tx) => {
      // Create the company
      const company = await tx.company.create({
        data: {
          name,
          csvUrl,
          csvUsername: csvUsername || null,
          csvPassword: csvPassword || null,
          maxUsers,
          status,
        },
      });

      // Create the admin user placeholder (they'll complete signup via Neon Auth)
      const adminUser = await tx.user.create({
        data: {
          email: adminEmail,
          name: adminName,
          role: "ADMIN",
          companyId: company.id,
          invitedBy: user.email,
          invitedAt: new Date(),
        },
      });

      return { company, adminUser };
    });

    return NextResponse.json(
      {
        company: result.company,
        adminUser: {
          email: result.adminUser.email,
          name: result.adminUser.name,
          role: result.adminUser.role,
        },
        // User should sign up via /auth/sign-up with this email
        signupUrl: "/auth/sign-up",
      },
      { status: 201 }
    );
  } catch (error) {
    console.error("Platform company creation error:", error);
    return NextResponse.json(
      { error: "Internal server error" },
      { status: 500 }
    );
  }
}