import type { CompanyStatus } from "@prisma/client";
import { type NextRequest, NextResponse } from "next/server";
import { getServerSession } from "next-auth";
import { platformAuthOptions } from "../../../../lib/platform-auth";
import { prisma } from "../../../../lib/prisma";
import { extractClientIP } from "../../../../lib/rateLimiter";
import {
  AuditOutcome,
  createAuditMetadata,
  securityAuditLogger,
} from "../../../../lib/securityAuditLogger";

// GET /api/platform/companies - List all companies
export async function GET(request: NextRequest) {
  let session: any = null;

  try {
    session = await getServerSession(platformAuthOptions);
    const ip = extractClientIP(request);
    const userAgent = request.headers.get("user-agent") || undefined;

    if (!session?.user?.isPlatformUser) {
      await securityAuditLogger.logPlatformAdmin(
        "platform_companies_unauthorized_access",
        AuditOutcome.BLOCKED,
        {
          ipAddress: ip,
          userAgent,
          metadata: createAuditMetadata({
            error: "no_platform_session",
          }),
        },
        "Unauthorized attempt to access platform companies list"
      );

      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 }),
    ]);

    // Log successful platform companies access
    await securityAuditLogger.logPlatformAdmin(
      "platform_companies_list_accessed",
      AuditOutcome.SUCCESS,
      {
        platformUserId: session.user.id,
        ipAddress: ip,
        userAgent,
        metadata: createAuditMetadata({
          companiesReturned: companies.length,
          totalCompanies: total,
          filters: { status, search },
          pagination: { page, limit },
        }),
      },
      "Platform companies list accessed"
    );

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

    await securityAuditLogger.logPlatformAdmin(
      "platform_companies_list_error",
      AuditOutcome.FAILURE,
      {
        platformUserId: session?.user?.id,
        ipAddress: extractClientIP(request),
        userAgent: request.headers.get("user-agent") || undefined,
        metadata: createAuditMetadata({
          error: "server_error",
        }),
      },
      `Server error in platform companies list: ${error}`
    );

    return NextResponse.json(
      { error: "Internal server error" },
      { status: 500 }
    );
  }
}

// POST /api/platform/companies - Create new company
export async function POST(request: NextRequest) {
  let session: any = null;

  try {
    session = await getServerSession(platformAuthOptions);
    const ip = extractClientIP(request);
    const userAgent = request.headers.get("user-agent") || undefined;

    if (
      !session?.user?.isPlatformUser ||
      session.user.platformRole === "SUPPORT"
    ) {
      await securityAuditLogger.logPlatformAdmin(
        "platform_company_create_unauthorized",
        AuditOutcome.BLOCKED,
        {
          platformUserId: session?.user?.id,
          ipAddress: ip,
          userAgent,
          metadata: createAuditMetadata({
            error: "insufficient_permissions",
            requiredRole: "ADMIN",
            currentRole: session?.user?.platformRole,
          }),
        },
        "Unauthorized attempt to create platform company"
      );

      return NextResponse.json(
        { error: "Admin access required" },
        { status: 403 }
      );
    }

    const body = await request.json();
    const {
      name,
      csvUrl,
      csvUsername,
      csvPassword,
      adminEmail,
      adminName,
      adminPassword,
      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 }
      );
    }

    // Generate password if not provided
    const finalAdminPassword =
      adminPassword || `Temp${Math.random().toString(36).slice(2, 8)}!`;

    // Hash the admin password
    const bcrypt = await import("bcryptjs");
    const hashedPassword = await bcrypt.hash(finalAdminPassword, 12);

    // Create company and admin user 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
      const adminUser = await tx.user.create({
        data: {
          email: adminEmail,
          password: hashedPassword,
          name: adminName,
          role: "ADMIN",
          companyId: company.id,
          invitedBy: session.user.email || "platform",
          invitedAt: new Date(),
        },
      });

      return {
        company,
        adminUser,
        generatedPassword: adminPassword ? null : finalAdminPassword,
      };
    });

    // Log successful company creation
    await securityAuditLogger.logCompanyManagement(
      "platform_company_created",
      AuditOutcome.SUCCESS,
      {
        platformUserId: session.user.id,
        companyId: result.company.id,
        ipAddress: ip,
        userAgent,
        metadata: createAuditMetadata({
          companyName: result.company.name,
          companyStatus: result.company.status,
          adminUserEmail: "[REDACTED]",
          adminUserName: result.adminUser.name,
          maxUsers: result.company.maxUsers,
          hasGeneratedPassword: !!result.generatedPassword,
        }),
      },
      "Platform company created successfully"
    );

    return NextResponse.json(
      {
        company: result.company,
        adminUser: {
          email: result.adminUser.email,
          name: result.adminUser.name,
          role: result.adminUser.role,
        },
        generatedPassword: result.generatedPassword,
      },
      { status: 201 }
    );
  } catch (error) {
    console.error("Platform company creation error:", error);

    await securityAuditLogger.logCompanyManagement(
      "platform_company_create_error",
      AuditOutcome.FAILURE,
      {
        platformUserId: session?.user?.id,
        ipAddress: extractClientIP(request),
        userAgent: request.headers.get("user-agent") || undefined,
        metadata: createAuditMetadata({
          error: "server_error",
        }),
      },
      `Server error in platform company creation: ${error}`
    );

    return NextResponse.json(
      { error: "Internal server error" },
      { status: 500 }
    );
  }
}