<?php

namespace App\Http\Controllers;

use App\Mail\PaymentApprovedByCashierMail;
use App\Mail\PaymentApprovedByAccountantMail;
use App\Mail\PaymentFullyApprovedMail;
use App\Mail\PaymentRejectedMail;
use App\Models\MembershipPayment;
use App\Models\User;
use App\Support\AuditLogger;
use Illuminate\Http\Request;
use Illuminate\Support\Facades\Auth;
use Illuminate\Support\Facades\Mail;
use Illuminate\Support\Facades\Storage;

class PaymentVerificationController extends Controller
{
    /**
     * Show payment verification dashboard
     */
    public function index(Request $request)
    {
        $user = Auth::user();
        $tab = $request->query('tab', 'all');

        // Base query with relationships
        $query = MembershipPayment::with(['member', 'submittedBy', 'verifiedByCashier', 'verifiedByAccountant', 'verifiedByChair', 'rejectedBy'])
            ->latest();

        // Filter by tab
        if ($tab === 'cashier' && $user->can('verify_payments_cashier')) {
            $query->where('status', MembershipPayment::STATUS_PENDING);
        } elseif ($tab === 'accountant' && $user->can('verify_payments_accountant')) {
            $query->where('status', MembershipPayment::STATUS_APPROVED_CASHIER);
        } elseif ($tab === 'chair' && $user->can('verify_payments_chair')) {
            $query->where('status', MembershipPayment::STATUS_APPROVED_ACCOUNTANT);
        } elseif ($tab === 'rejected') {
            $query->where('status', MembershipPayment::STATUS_REJECTED);
        } elseif ($tab === 'approved') {
            $query->where('status', MembershipPayment::STATUS_APPROVED_CHAIR);
        }

        // Filter by search
        if ($search = $request->query('search')) {
            $query->whereHas('member', function ($q) use ($search) {
                $q->where('full_name', 'like', "%{$search}%")
                  ->orWhere('email', 'like', "%{$search}%");
            })->orWhere('reference', 'like', "%{$search}%");
        }

        $payments = $query->paginate(20)->withQueryString();

        // Get counts for tabs
        $counts = [
            'pending' => MembershipPayment::where('status', MembershipPayment::STATUS_PENDING)->count(),
            'cashier_approved' => MembershipPayment::where('status', MembershipPayment::STATUS_APPROVED_CASHIER)->count(),
            'accountant_approved' => MembershipPayment::where('status', MembershipPayment::STATUS_APPROVED_ACCOUNTANT)->count(),
            'approved' => MembershipPayment::where('status', MembershipPayment::STATUS_APPROVED_CHAIR)->count(),
            'rejected' => MembershipPayment::where('status', MembershipPayment::STATUS_REJECTED)->count(),
        ];

        return view('admin.payment-verifications.index', compact('payments', 'tab', 'counts'));
    }

    /**
     * Show verification form for a payment
     */
    public function show(MembershipPayment $payment)
    {
        $payment->load(['member', 'submittedBy', 'verifiedByCashier', 'verifiedByAccountant', 'verifiedByChair', 'rejectedBy']);

        return view('admin.payment-verifications.show', compact('payment'));
    }

    /**
     * Approve payment (cashier tier)
     */
    public function approveByCashier(Request $request, MembershipPayment $payment)
    {
        if (!Auth::user()->can('verify_payments_cashier')) {
            abort(403, 'You do not have permission to verify payments as cashier.');
        }

        if (!$payment->canBeApprovedByCashier()) {
            return back()->with('error', __('This payment cannot be approved at this stage.'));
        }

        $validated = $request->validate([
            'notes' => ['nullable', 'string', 'max:1000'],
            'disability_action' => ['nullable', 'in:approve,reject'],
            'disability_rejection_reason' => ['required_if:disability_action,reject', 'nullable', 'string', 'max:500'],
        ]);

        // Handle disability certificate verification if applicable
        $member = $payment->member;
        if ($member && $member->hasDisabilityCertificate() && $member->isDisabilityPending()) {
            if ($validated['disability_action'] === 'approve') {
                $member->approveDisabilityCertificate(Auth::user());
            } elseif ($validated['disability_action'] === 'reject') {
                $member->rejectDisabilityCertificate(Auth::user(), $validated['disability_rejection_reason']);
            }
        }

        $payment->update([
            'status' => MembershipPayment::STATUS_APPROVED_CASHIER,
            'verified_by_cashier_id' => Auth::id(),
            'cashier_verified_at' => now(),
            'notes' => $validated['notes'] ?? $payment->notes,
        ]);

        AuditLogger::log('payment.approved_by_cashier', $payment, [
            'member_id' => $payment->member_id,
            'amount' => $payment->amount,
            'verified_by' => Auth::id(),
        ]);

        // Send notification to member
        Mail::to($payment->member->email)->queue(new PaymentApprovedByCashierMail($payment));

        // Send notification to accountants
        $accountants = User::permission('verify_payments_accountant')->get();
        foreach ($accountants as $accountant) {
            Mail::to($accountant->email)->queue(new PaymentApprovedByCashierMail($payment));
        }

        return redirect()->route('admin.payment-verifications.index')
            ->with('status', __('Payment approved by cashier. Forwarded to accountant for review.'));
    }

    /**
     * Approve payment (accountant tier)
     */
    public function approveByAccountant(Request $request, MembershipPayment $payment)
    {
        if (!Auth::user()->can('verify_payments_accountant')) {
            abort(403, 'You do not have permission to verify payments as accountant.');
        }

        if (!$payment->canBeApprovedByAccountant()) {
            return back()->with('error', __('This payment cannot be approved at this stage.'));
        }

        $validated = $request->validate([
            'notes' => ['nullable', 'string', 'max:1000'],
        ]);

        $payment->update([
            'status' => MembershipPayment::STATUS_APPROVED_ACCOUNTANT,
            'verified_by_accountant_id' => Auth::id(),
            'accountant_verified_at' => now(),
            'notes' => $validated['notes'] ?? $payment->notes,
        ]);

        AuditLogger::log('payment.approved_by_accountant', $payment, [
            'member_id' => $payment->member_id,
            'amount' => $payment->amount,
            'verified_by' => Auth::id(),
        ]);

        // Send notification to member
        Mail::to($payment->member->email)->queue(new PaymentApprovedByAccountantMail($payment));

        // Send notification to chairs
        $chairs = User::permission('verify_payments_chair')->get();
        foreach ($chairs as $chair) {
            Mail::to($chair->email)->queue(new PaymentApprovedByAccountantMail($payment));
        }

        return redirect()->route('admin.payment-verifications.index')
            ->with('status', __('Payment approved by accountant. Forwarded to chair for final approval.'));
    }

    /**
     * Approve payment (chair tier - final approval)
     */
    public function approveByChair(Request $request, MembershipPayment $payment)
    {
        if (!Auth::user()->can('verify_payments_chair')) {
            abort(403, 'You do not have permission to verify payments as chair.');
        }

        if (!$payment->canBeApprovedByChair()) {
            return back()->with('error', __('This payment cannot be approved at this stage.'));
        }

        $validated = $request->validate([
            'notes' => ['nullable', 'string', 'max:1000'],
        ]);

        $payment->update([
            'status' => MembershipPayment::STATUS_APPROVED_CHAIR,
            'verified_by_chair_id' => Auth::id(),
            'chair_verified_at' => now(),
            'notes' => $validated['notes'] ?? $payment->notes,
        ]);

        // Activate member on final approval
        if ($payment->member) {
            $payment->member->update([
                'membership_status' => \App\Models\Member::STATUS_ACTIVE,
                'membership_started_at' => now(),
                'membership_expires_at' => now()->addYear(),
            ]);
        }

        AuditLogger::log('payment.approved_by_chair', $payment, [
            'member_id' => $payment->member_id,
            'amount' => $payment->amount,
            'verified_by' => Auth::id(),
        ]);

        // Send notification to member and admins
        Mail::to($payment->member->email)->queue(new PaymentFullyApprovedMail($payment));
        Mail::to($payment->member->email)->queue(new \App\Mail\MembershipActivatedMail($payment->member));

        // Notify membership managers
        $managers = User::permission('activate_memberships')->get();
        foreach ($managers as $manager) {
            Mail::to($manager->email)->queue(new PaymentFullyApprovedMail($payment));
        }

        return redirect()->route('admin.payment-verifications.index')
            ->with('status', __('Payment fully approved! Member can now be activated by membership manager.'));
    }

    /**
     * Reject payment
     */
    public function reject(Request $request, MembershipPayment $payment)
    {
        $user = Auth::user();

        // Check if user has any verification permission
        if (!$user->can('verify_payments_cashier')
            && !$user->can('verify_payments_accountant')
            && !$user->can('verify_payments_chair')) {
            abort(403, 'You do not have permission to reject payments.');
        }

        if ($payment->isFullyApproved()) {
            return back()->with('error', __('Cannot reject a fully approved payment.'));
        }

        $validated = $request->validate([
            'rejection_reason' => ['required', 'string', 'max:1000'],
        ]);

        $payment->update([
            'status' => MembershipPayment::STATUS_REJECTED,
            'rejected_by_user_id' => Auth::id(),
            'rejected_at' => now(),
            'rejection_reason' => $validated['rejection_reason'],
        ]);

        AuditLogger::log('payment.rejected', $payment, [
            'member_id' => $payment->member_id,
            'amount' => $payment->amount,
            'rejected_by' => Auth::id(),
            'reason' => $validated['rejection_reason'],
        ]);

        // Send notification to member
        Mail::to($payment->member->email)->queue(new PaymentRejectedMail($payment));

        return redirect()->route('admin.payment-verifications.index')
            ->with('status', __('Payment rejected. Member has been notified.'));
    }

    /**
     * Download payment receipt
     */
    public function downloadReceipt(MembershipPayment $payment)
    {
        if (!$payment->receipt_path || !Storage::exists($payment->receipt_path)) {
            abort(404, 'Receipt file not found.');
        }

        $fileName = 'payment_receipt_' . $payment->member->full_name . '_' . $payment->paid_at->format('Ymd') . '.' . pathinfo($payment->receipt_path, PATHINFO_EXTENSION);

        return Storage::download($payment->receipt_path, $fileName);
    }
}