<?php

namespace App\Http\Controllers;

use App\Models\Member;
use App\Support\AuditLogger;
use Spatie\Permission\Models\Role;
use Symfony\Component\HttpFoundation\StreamedResponse;
use Illuminate\Http\Request;
use Illuminate\Support\Facades\Artisan;

class AdminMemberController extends Controller
{
    public function index(Request $request)
    {
        $query = Member::query()->with('user');

        // Text search (name, email, phone, national ID)
        if ($search = $request->string('search')->toString()) {
            $query->where(function ($q) use ($search) {
                $q->where('full_name', 'like', "%{$search}%")
                    ->orWhere('email', 'like', "%{$search}%")
                    ->orWhere('phone', 'like', "%{$search}%");

                // Search by national ID hash if provided
                if (!empty($search)) {
                    $q->orWhere('national_id_hash', hash('sha256', $search));
                }
            });
        }

        // Membership status filter
        if ($status = $request->string('status')->toString()) {
            if ($status === 'active') {
                $query->whereDate('membership_expires_at', '>=', now()->toDateString());
            } elseif ($status === 'expired') {
                $query->where(function ($q) {
                    $q->whereNull('membership_expires_at')
                        ->orWhereDate('membership_expires_at', '<', now()->toDateString());
                });
            } elseif ($status === 'expiring_soon') {
                $query->whereBetween('membership_expires_at', [
                    now()->toDateString(),
                    now()->addDays(30)->toDateString()
                ]);
            }
        }

        // Date range filters
        if ($startedFrom = $request->string('started_from')->toString()) {
            $query->whereDate('membership_started_at', '>=', $startedFrom);
        }
        if ($startedTo = $request->string('started_to')->toString()) {
            $query->whereDate('membership_started_at', '<=', $startedTo);
        }

        // Payment status filter
        if ($paymentStatus = $request->string('payment_status')->toString()) {
            if ($paymentStatus === 'has_payments') {
                $query->whereHas('payments');
            } elseif ($paymentStatus === 'no_payments') {
                $query->whereDoesntHave('payments');
            }
        }

        $members = $query->orderBy('full_name')->paginate(15)->withQueryString();

        return view('admin.members.index', [
            'members' => $members,
            'filters' => $request->only(['search', 'status', 'started_from', 'started_to', 'payment_status']),
        ]);
    }

    public function show(Member $member)
    {
        $member->load('user.roles', 'payments');

        $roles = Role::orderBy('name')->get();

        return view('admin.members.show', [
            'member' => $member,
            'roles' => $roles,
        ]);
    }

    public function create()
    {
        return view('admin.members.create');
    }

    public function store(Request $request)
    {
        $validated = $request->validate([
            'full_name' => ['required', 'string', 'max:255'],
            'email' => ['required', 'email', 'max:255', 'unique:users,email'],
            'national_id' => ['nullable', 'string', 'max:50'],
            'phone' => ['nullable', 'string', 'max:50'],
            'address_line_1' => ['nullable', 'string', 'max:255'],
            'address_line_2' => ['nullable', 'string', 'max:255'],
            'city' => ['nullable', 'string', 'max:120'],
            'postal_code' => ['nullable', 'string', 'max:20'],
            'emergency_contact_name' => ['nullable', 'string', 'max:255'],
            'emergency_contact_phone' => ['nullable', 'string', 'max:50'],
            'membership_started_at' => ['nullable', 'date'],
            'membership_expires_at' => ['nullable', 'date', 'after_or_equal:membership_started_at'],
        ]);

        // Create user account
        $user = \App\Models\User::create([
            'name' => $validated['full_name'],
            'email' => $validated['email'],
            'password' => \Illuminate\Support\Str::random(32),
        ]);

        // Create member record
        $member = Member::create(array_merge($validated, [
            'user_id' => $user->id,
        ]));

        // Send activation email
        $token = \Illuminate\Support\Facades\Password::createToken($user);
        \Illuminate\Support\Facades\Mail::to($user)->queue(new \App\Mail\MemberActivationMail($user, $token));

        // Log the action
        AuditLogger::log('member.created', $member, $validated);
        AuditLogger::log('user.activation_link_sent', $user, ['email' => $user->email]);

        return redirect()
            ->route('admin.members.show', $member)
            ->with('status', __('Member created successfully. Activation email has been sent.'));
    }

    public function edit(Member $member)
    {
        return view('admin.members.edit', [
            'member' => $member,
        ]);
    }

    public function update(Request $request, Member $member)
    {
        $validated = $request->validate([
            'full_name' => ['required', 'string', 'max:255'],
            'email' => ['required', 'email', 'max:255'],
            'national_id' => ['nullable', 'string', 'max:50'],
            'phone' => ['nullable', 'string', 'max:50'],
            'address_line_1' => ['nullable', 'string', 'max:255'],
            'address_line_2' => ['nullable', 'string', 'max:255'],
            'city' => ['nullable', 'string', 'max:120'],
            'postal_code' => ['nullable', 'string', 'max:20'],
            'emergency_contact_name' => ['nullable', 'string', 'max:255'],
            'emergency_contact_phone' => ['nullable', 'string', 'max:50'],
            'membership_started_at' => ['nullable', 'date'],
            'membership_expires_at' => ['nullable', 'date', 'after_or_equal:membership_started_at'],
        ]);

        $member->update($validated);
        AuditLogger::log('member.updated', $member, $validated);

        return redirect()
            ->route('admin.members.show', $member)
            ->with('status', __('Member updated successfully.'));
    }

    public function importForm()
    {
        return view('admin.members.import');
    }

    public function import(Request $request)
    {
        $validated = $request->validate([
            'file' => ['required', 'file', 'mimes:csv,txt'],
        ]);

        $path = $validated['file']->store('imports');
        $fullPath = storage_path('app/'.$path);

        Artisan::call('members:import', ['path' => $fullPath]);

        $output = Artisan::output();

        AuditLogger::log('members.imported', null, [
            'path' => $fullPath,
            'output' => $output,
        ]);

        return redirect()
            ->route('admin.members.index')
            ->with('status', __('Import completed.')."\n".$output);
    }

    public function updateRoles(Request $request, Member $member)
    {
        $user = $member->user;

        if (! $user) {
            abort(400, 'Member is not linked to a user.');
        }

        $validated = $request->validate([
            'roles' => ['nullable', 'array'],
            'roles.*' => ['exists:roles,name'],
        ]);

        $roleNames = $validated['roles'] ?? [];
        $user->syncRoles($roleNames);

        AuditLogger::log('member.roles_updated', $member, ['roles' => $roleNames]);

        return redirect()->route('admin.members.show', $member)->with('status', __('Roles updated.'));
    }

    /**
     * Show membership activation form
     */
    public function showActivate(Member $member)
    {
        // Check if user has permission
        if (!auth()->user()->can('activate_memberships') && !auth()->user()->hasRole('admin')) {
            abort(403, 'You do not have permission to activate memberships.');
        }

        // Check if member has fully approved payment
        $approvedPayment = $member->payments()
            ->where('status', \App\Models\MembershipPayment::STATUS_APPROVED_CHAIR)
            ->latest()
            ->first();

        if (!$approvedPayment && !auth()->user()->hasRole('admin')) {
            return redirect()->route('admin.members.show', $member)
                ->with('error', __('Member must have an approved payment before activation.'));
        }

        return view('admin.members.activate', compact('member', 'approvedPayment'));
    }

    /**
     * Activate membership
     */
    public function activate(Request $request, Member $member)
    {
        // Check if user has permission
        if (!auth()->user()->can('activate_memberships') && !auth()->user()->hasRole('admin')) {
            abort(403, 'You do not have permission to activate memberships.');
        }

        $validated = $request->validate([
            'membership_started_at' => ['required', 'date'],
            'membership_expires_at' => ['required', 'date', 'after:membership_started_at'],
            'membership_type' => ['required', 'in:regular,honorary,lifetime,student'],
        ]);

        // Update member
        $member->update([
            'membership_started_at' => $validated['membership_started_at'],
            'membership_expires_at' => $validated['membership_expires_at'],
            'membership_type' => $validated['membership_type'],
            'membership_status' => Member::STATUS_ACTIVE,
        ]);

        AuditLogger::log('member.activated', $member, [
            'started_at' => $validated['membership_started_at'],
            'expires_at' => $validated['membership_expires_at'],
            'type' => $validated['membership_type'],
            'activated_by' => auth()->id(),
        ]);

        // Send activation confirmation email
        \Illuminate\Support\Facades\Mail::to($member->email)
            ->queue(new \App\Mail\MembershipActivatedMail($member));

        return redirect()->route('admin.members.show', $member)
            ->with('status', __('Membership activated successfully! Member has been notified.'));
    }

    public function export(Request $request): StreamedResponse
    {
        $query = Member::query()->with('user');

        if ($search = $request->string('search')->toString()) {
            $query->where(function ($q) use ($search) {
                $q->where('full_name', 'like', "%{$search}%")
                    ->orWhere('email', 'like', "%{$search}%");
            });
        }

        if ($status = $request->string('status')->toString()) {
            if ($status === 'active') {
                $query->whereDate('membership_expires_at', '>=', now()->toDateString());
            } elseif ($status === 'expired') {
                $query->where(function ($q) {
                    $q->whereNull('membership_expires_at')
                        ->orWhereDate('membership_expires_at', '<', now()->toDateString());
                });
            }
        }

        $headers = [
            'ID',
            'Full Name',
            'Email',
            'Phone',
            'Address Line 1',
            'Address Line 2',
            'City',
            'Postal Code',
            'Emergency Contact Name',
            'Emergency Contact Phone',
            'Membership Start',
            'Membership Expiry',
        ];

        $response = new StreamedResponse(function () use ($query, $headers) {
            $handle = fopen('php://output', 'w');
            fputcsv($handle, $headers);

            $query->chunk(500, function ($members) use ($handle) {
                foreach ($members as $member) {
                    fputcsv($handle, [
                        $member->id,
                        $member->full_name,
                        $member->email,
                        $member->phone,
                        $member->address_line_1,
                        $member->address_line_2,
                        $member->city,
                        $member->postal_code,
                        $member->emergency_contact_name,
                        $member->emergency_contact_phone,
                        optional($member->membership_started_at)->toDateString(),
                        optional($member->membership_expires_at)->toDateString(),
                    ]);
                }
            });

            fclose($handle);
        });

        $filename = 'members-export-'.now()->format('Ymd_His').'.csv';

        $response->headers->set('Content-Type', 'text/csv');
        $response->headers->set('Content-Disposition', "attachment; filename=\"{$filename}\"");

        return $response;
    }

    public function batchDestroy(Request $request)
    {
        $validated = $request->validate([
            'ids' => ['required', 'array'],
            'ids.*' => ['exists:members,id'],
        ]);

        $count = Member::whereIn('id', $validated['ids'])->delete();

        AuditLogger::log('members.batch_deleted', null, ['ids' => $validated['ids'], 'count' => $count]);

        return back()->with('status', __(':count members deleted successfully.', ['count' => $count]));
    }

    public function batchUpdateStatus(Request $request)
    {
        $validated = $request->validate([
            'ids' => ['required', 'array'],
            'ids.*' => ['exists:members,id'],
            'status' => ['required', 'in:pending,active,expired,suspended'],
        ]);

        $count = Member::whereIn('id', $validated['ids'])->update(['membership_status' => $validated['status']]);

        AuditLogger::log('members.batch_status_updated', null, [
            'ids' => $validated['ids'],
            'status' => $validated['status'],
            'count' => $count
        ]);

        return back()->with('status', __(':count members updated successfully.', ['count' => $count]));
    }

    /**
     * View member's disability certificate
     */
    public function viewDisabilityCertificate(Member $member)
    {
        if (!$member->disability_certificate_path) {
            abort(404, '找不到身心障礙手冊');
        }

        if (!\Illuminate\Support\Facades\Storage::disk('private')->exists($member->disability_certificate_path)) {
            abort(404, '檔案不存在');
        }

        return \Illuminate\Support\Facades\Storage::disk('private')->response($member->disability_certificate_path);
    }
}