<?php

namespace App\Http\Controllers\Admin;

use App\Http\Controllers\Controller;
use App\Models\User;
use App\Models\EmployerProfile;
use App\Models\Sponsor;
use Illuminate\Http\Request;
use Inertia\Inertia;
use Illuminate\Support\Facades\DB;

class EmployerController extends Controller
{
    /**
     * List all employers (role = 'employer') with filters, search, and sorting.
     */
    public function index(Request $request)
    {
        $query = User::where('role', 'employer')->with(['employerProfile', 'sponsor']);

        // Search
        if ($request->filled('search')) {
            $search = $request->input('search');
            $query->where(function($q) use ($search) {
                $q->where('name', 'like', "%{$search}%")
                  ->orWhere('email', 'like', "%{$search}%")
                  ->orWhereHas('employerProfile', function($qp) use ($search) {
                      $qp->where('company_name', 'like', "%{$search}%")
                         ->orWhere('phone', 'like', "%{$search}%");
                  });
            });
        }

        // Status filter (on sponsor status)
        if ($request->filled('status') && $request->input('status') !== 'All') {
            $status = strtolower($request->input('status'));
            $query->whereHas('sponsor', function($qs) use ($status) {
                $qs->where('status', $status);
            });
        }

        // Location filter
        if ($request->filled('location') && $request->input('location') !== 'All') {
            $location = $request->input('location');
            $query->whereHas('employerProfile', function($qp) use ($location) {
                $qp->where('country', $location);
            });
        }

        // Sorting
        $sortField = $request->input('sort_field', 'created_at');
        $sortOrder = $request->input('sort_order', 'desc');
        if (in_array($sortField, ['name', 'email', 'created_at'])) {
            $query->orderBy($sortField, $sortOrder);
        } else {
            $query->orderBy('created_at', 'desc');
        }

        $employers = $query->paginate(10)->withQueryString();

        // Transform results to format status correctly from sponsor
        $employers->getCollection()->transform(function($emp) {
            $emp->status = $emp->sponsor ? $emp->sponsor->status : 'active';
            return $emp;
        });

        return Inertia::render('Admin/Employers/Index', [
            'employers' => $employers,
            'sponsors' => $employers,
            'filters' => $request->only(['search', 'status', 'location', 'sort_field', 'sort_order'])
        ]);
    }

    /**
     * Export employers as CSV.
     */
    public function export(Request $request)
    {
        $query = User::where('role', 'employer')->with(['employerProfile', 'sponsor']);

        // Search
        if ($request->filled('search')) {
            $search = $request->input('search');
            $query->where(function($q) use ($search) {
                $q->where('name', 'like', "%{$search}%")
                  ->orWhere('email', 'like', "%{$search}%")
                  ->orWhereHas('employerProfile', function($qp) use ($search) {
                      $qp->where('company_name', 'like', "%{$search}%")
                         ->orWhere('phone', 'like', "%{$search}%");
                  });
            });
        }

        // Status filter
        if ($request->filled('status') && $request->input('status') !== 'All') {
            $status = strtolower($request->input('status'));
            $query->whereHas('sponsor', function($qs) use ($status) {
                $qs->where('status', $status);
            });
        }

        $employers = $query->get();

        $headers = [
            "Content-type"        => "text/csv",
            "Content-Disposition" => "attachment; filename=employers_export_" . date('Ymd_His') . ".csv",
            "Pragma"              => "no-cache",
            "Cache-Control"       => "must-revalidate, post-check=0, pre-check=0",
            "Expires"             => "0"
        ];

        $columns = ['ID', 'Name', 'Email', 'Company Name', 'Phone', 'Country', 'Status', 'Subscription Status', 'Created At'];

        $callback = function() use ($employers, $columns) {
            $file = fopen('php://output', 'w');
            fputcsv($file, $columns);

            foreach ($employers as $emp) {
                fputcsv($file, [
                    $emp->id,
                    $emp->name,
                    $emp->email,
                    $emp->employerProfile->company_name ?? 'N/A',
                    $emp->employerProfile->phone ?? 'N/A',
                    $emp->employerProfile->country ?? 'N/A',
                    $emp->sponsor ? $emp->sponsor->status : 'active',
                    $emp->subscription_status ?? 'none',
                    $emp->created_at ? $emp->created_at->toDateTimeString() : 'N/A',
                ]);
            }

            fclose($file);
        };

        return response()->stream($callback, 200, $headers);
    }

    /**
     * Verify / approve employer profile.
     */
    public function verify($id)
    {
        $user = User::where('role', 'employer')->findOrFail($id);
        if ($user->employerProfile) {
            $user->employerProfile->update([
                'verification_status' => 'approved'
            ]);
        }
        
        $sponsor = Sponsor::where('email', $user->email)->first();
        if ($sponsor) {
            $sponsor->update([
                'is_verified' => true,
                'status' => 'active'
            ]);
        }

        return back()->with('success', "Employer '{$user->name}' profile verified and activated successfully.");
    }

    /**
     * Suspend an employer.
     */
    public function suspend($id)
    {
        $user = User::where('role', 'employer')->findOrFail($id);
        
        $sponsor = Sponsor::where('email', $user->email)->first();
        if ($sponsor) {
            $sponsor->update(['status' => 'suspended']);
        }

        return back()->with('success', "Employer '{$user->name}' suspended successfully.");
    }

    /**
     * Activate a suspended/inactive employer.
     */
    public function activate($id)
    {
        $user = User::where('role', 'employer')->findOrFail($id);
        
        $sponsor = Sponsor::where('email', $user->email)->first();
        if ($sponsor) {
            $sponsor->update(['status' => 'active']);
        }

        return back()->with('success', "Employer '{$user->name}' activated successfully.");
    }

    /**
     * Delete an employer.
     */
    public function delete($id)
    {
        $user = User::where('role', 'employer')->findOrFail($id);
        $name = $user->name;
        
        $sponsor = Sponsor::where('email', $user->email)->first();
        if ($sponsor) {
            $sponsor->delete();
        }

        if ($user->employerProfile) {
            $user->employerProfile->delete();
        }
        $user->delete();

        return back()->with('success', "Employer '{$name}' deleted successfully.");
    }

    /**
     * Update an employer's fields.
     */
    public function update(Request $request, $id)
    {
        $user = User::where('role', 'employer')->findOrFail($id);
        $validated = $request->validate([
            'name' => 'required|string|max:255',
            'email' => 'required|email|unique:users,email,' . $user->id,
            'company_name' => 'nullable|string|max:255',
            'phone' => 'nullable|string',
            'country' => 'nullable|string',
            'subscription_status' => 'nullable|string',
        ]);

        $user->update([
            'name' => $validated['name'],
            'email' => $validated['email'],
            'subscription_status' => $validated['subscription_status'] ?? $user->subscription_status,
        ]);

        if ($user->employerProfile) {
            $user->employerProfile->update([
                'company_name' => $validated['company_name'] ?? $user->employerProfile->company_name,
                'phone' => $validated['phone'] ?? $user->employerProfile->phone,
                'country' => $validated['country'] ?? $user->employerProfile->country,
            ]);
        } else {
            EmployerProfile::create([
                'user_id' => $user->id,
                'company_name' => $validated['company_name'],
                'phone' => $validated['phone'],
                'country' => $validated['country'],
            ]);
        }

        $sponsor = Sponsor::where('email', $user->email)->first();
        if ($sponsor) {
            $sponsor->update([
                'full_name' => $validated['name'],
                'email' => $validated['email'],
                'mobile' => $validated['phone'] ?? $sponsor->mobile,
                'organization_name' => $validated['company_name'] ?? $sponsor->organization_name,
                'city' => $validated['country'] ?? $sponsor->city,
            ]);
        }

        return back()->with('success', "Employer details saved successfully.");
    }
}