<?php

namespace App\Http\Controllers\Employer;

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

class PaymentController extends Controller
{
    private function resolveCurrentUser(): ?User
    {
        // Prefer Laravel's built-in auth (most reliable)
        if (auth()->check()) {
            return auth()->user();
        }

        // Fallback: session-based user (registration auto-login flow)
        $sess = session('user');
        $sessId = is_array($sess) ? ($sess['id'] ?? null) : ($sess->id ?? null);

        return $sessId ? User::find($sessId) : null;
    }

    public function index(Request $request)
    {
        $user = $this->resolveCurrentUser();

        if (!$user) {
            return redirect()->route('employer.login');
        }

        // Payments are stored in the subscriptions table during registration
        $subscriptions = DB::table('subscriptions')
            ->where('user_id', $user->id)
            ->latest('id')
            ->get();

        $payments = $subscriptions->map(function ($sub) {
            $planLabel = ucfirst($sub->plan_id) . ' Sponsor Pass Subscription';
            $date      = \Carbon\Carbon::parse($sub->starts_at ?? $sub->created_at);

            return [
                'id'          => $sub->id,
                'amount'      => (float) $sub->amount_aed,
                'currency'    => 'AED',
                'description' => $planLabel,
                'status'      => $sub->status === 'active' ? 'success' : $sub->status,
                'date'        => $date->format('M d, Y'),
                'time'        => $date->format('h:i A'),
                'invoice_no'  => 'INV-' . str_pad($sub->id, 6, '0', STR_PAD_LEFT),
                'transaction_id' => $sub->paytabs_transaction_id,
                'expires_at'  => $sub->expires_at ? \Carbon\Carbon::parse($sub->expires_at)->format('M d, Y') : null,
            ];
        })->toArray();

        // Latest active subscription for the summary cards
        $activeSub   = $subscriptions->where('status', 'active')->first();
        $expiresAt   = $activeSub && $activeSub->expires_at
                        ? \Carbon\Carbon::parse($activeSub->expires_at)->format('M d, Y')
                        : null;
        $currentPlan = $activeSub
                        ? ucfirst($activeSub->plan_id) . ' Sponsor Pass'
                        : null;
        $subStatus   = ucfirst($user->subscription_status ?? 'none');

        return Inertia::render('Employer/PaymentHistory', [
            'payments'           => $payments,
            'currentPlan'        => $currentPlan,
            'expiresAt'          => $expiresAt,
            'subscriptionStatus' => $subStatus,
        ]);
    }

    public function purchase(Request $request)
    {
        $user = $this->resolveCurrentUser();
        if (!$user) {
            return response()->json(['error' => 'Unauthorized'], 401);
        }

        $request->validate([
            'plan_id' => 'required|string',
        ]);

        $planId = $request->plan_id;
        $plan = \App\Models\Plan::find($planId);
        if (!$plan) {
            return response()->json(['error' => 'Plan not found'], 404);
        }

        // Check if there is any active or pending subscription for the user to determine start time
        $lastSub = \App\Models\Subscription::where('user_id', $user->id)
            ->whereIn('status', ['active', 'pending'])
            ->orderBy('expires_at', 'desc')
            ->first();

        $durationDays = strtolower($plan->duration) === 'yearly' ? 365 : 30;

        if ($lastSub) {
            // Queue it to start when the current subscription expires
            $startsAt = \Carbon\Carbon::parse($lastSub->expires_at);
            $expiresAt = $startsAt->copy()->addDays($durationDays);
            $status = 'pending';
        } else {
            // Activate immediately
            $startsAt = now();
            $expiresAt = now()->addDays($durationDays);
            $status = 'active';
        }

        // Store subscription in DB
        $sub = \App\Models\Subscription::create([
            'user_id' => $user->id,
            'plan_id' => $plan->id,
            'amount_aed' => $plan->price,
            'starts_at' => $startsAt,
            'expires_at' => $expiresAt,
            'paytabs_transaction_id' => 'PT-' . strtoupper(uniqid()),
            'status' => $status
        ]);

        // If active, sync user subscription fields
        if ($status === 'active') {
            $user->subscription_status = 'active';
            $user->subscription_expires_at = $expiresAt;
            $user->save();
        }

        // Build complete dynamic subscription/invoice history list
        $invoices = \App\Models\Subscription::leftJoin('plans', 'subscriptions.plan_id', '=', 'plans.id')
            ->where('subscriptions.user_id', $user->id)
            ->orderBy('subscriptions.created_at', 'desc')
            ->select('subscriptions.*', 'plans.name as plan_name')
            ->get()
            ->map(function($s) {
                $planLabel = $s->plan_name ?: (ucfirst($s->plan_id) . ' Pass');
                $subStatus = strtolower($s->status);
                if ($subStatus !== 'active' && $subStatus !== 'pending' && $subStatus !== 'expired') {
                    $subStatus = 'expired';
                }
                return [
                    'id' => 'INV-' . date('Y', strtotime($s->created_at)) . '-' . str_pad($s->id, 3, '0', STR_PAD_LEFT),
                    'plan_name' => $planLabel,
                    'purchase_date' => date('M d, Y', strtotime($s->created_at)),
                    'activation_date' => $s->starts_at ? date('M d, Y', strtotime($s->starts_at)) : 'N/A',
                    'expiry_date' => $s->expires_at ? date('M d, Y', strtotime($s->expires_at)) : 'N/A',
                    'amount' => round($s->amount_aed) . ' AED',
                    'payment_status' => 'Paid',
                    'status' => ucfirst($subStatus),
                ];
            })->toArray();

        return response()->json([
            'success' => true,
            'message' => 'Subscription purchased successfully!',
            'invoices' => $invoices,
            'currentPlan' => $status === 'active' ? $plan->name : null,
            'expiresAt' => $status === 'active' ? date('Y-m-d', strtotime($expiresAt)) : null,
        ]);
    }
}