<?php

namespace App\Http\Controllers\Qms;

use App\Http\Controllers\Controller;
use App\Http\Controllers\Qms\Concerns\ScopesToAccount;
use App\Models\Organization;
use App\Services\Billing\BillingClient;
use App\Services\Qms\PlanService;
use App\Services\Qms\QmsPermissions;
use Illuminate\Http\RedirectResponse;
use Illuminate\Http\Request;
use Illuminate\Support\Carbon;
use Illuminate\View\View;

class ProController extends Controller
{
    use ScopesToAccount;

    public function index(Request $request, PlanService $plans): View
    {
        $organization = $this->organization($request);
        $canManage = app(QmsPermissions::class)->can($this->member($request), 'settings.manage');
        $settings = $organization->settings ?? [];
        $expiresAt = ! empty($settings['plan_expires_at'])
            ? Carbon::parse($settings['plan_expires_at'])
            : null;
        $planKey = $plans->planKey($organization);
        $branchCount = $plans->activeBranchCount($organization);
        $proPrice = $plans->proPriceMinor($organization);
        $enterprisePrice = $plans->enterprisePriceMinor($organization);
        $billedBranches = (int) ($settings['pro_billed_branches']
            ?? $settings['enterprise_billed_branches']
            ?? $branchCount);

        return view('qms.pro.index', [
            'organization' => $organization,
            'planKey' => $planKey,
            'isPro' => $planKey === 'pro',
            'isEnterprise' => $planKey === 'enterprise',
            'hasPaidPlan' => $plans->hasPaidPlan($organization),
            'canManage' => $canManage,
            'proPricePerBranchMinor' => $plans->proPricePerBranchMinor(),
            'proPriceMinor' => $proPrice,
            'enterprisePricePerBranchMinor' => $plans->enterprisePricePerBranchMinor(),
            'enterprisePriceMinor' => $enterprisePrice,
            'branchCount' => $branchCount,
            'canSubscribeEnterprise' => $plans->canSubscribeEnterprise($organization),
            'enterpriseMinBranches' => (int) config('qms.enterprise.min_branches', 2),
            'prepaidMonths' => (array) config('qms.prepaid_months', [6, 12, 24]),
            'currency' => (string) config('billing.currency', 'GHS'),
            'planExpiresAt' => $expiresAt,
            'proBilledBranches' => (int) ($settings['pro_billed_branches'] ?? $branchCount),
            'enterpriseBilledBranches' => (int) ($settings['enterprise_billed_branches'] ?? $branchCount),
            'billedBranches' => $billedBranches,
            'salesUrl' => ladill_platform_url('contact-sales'),
        ]);
    }

    public function subscribe(Request $request, PlanService $plans, BillingClient $billing): RedirectResponse
    {
        $this->authorizeAbility($request, 'settings.manage');
        $organization = $this->organization($request);

        if ($plans->hasPaidPlan($organization)) {
            return redirect()->route('qms.pro.index')
                ->with('success', 'Your organization already has an active paid plan.');
        }

        return $this->chargeMonthlyWallet(
            $organization,
            $billing,
            $plans->proPriceMinor($organization),
            'pro',
            'queue_pro',
            'queue-pro-'.$organization->id.'-'.now()->format('Y-m-d-His'),
            'Ladill Queue Pro — monthly subscription',
            'Welcome to Queue Pro — active for one month.',
            $plans->activeBranchCount($organization),
        );
    }

    public function subscribeEnterprise(Request $request, PlanService $plans, BillingClient $billing): RedirectResponse
    {
        $this->authorizeAbility($request, 'settings.manage');
        $organization = $this->organization($request);

        if ($plans->hasPaidPlan($organization)) {
            return redirect()->route('qms.pro.index')
                ->with('success', 'Your organization already has an active paid plan.');
        }

        if (! $plans->canSubscribeEnterprise($organization)) {
            $min = (int) config('qms.enterprise.min_branches', 2);

            return redirect()->route('qms.pro.index')
                ->with('error', "Enterprise billing requires at least {$min} active branches. Add another branch or choose Pro for a single site.");
        }

        return $this->chargeMonthlyWallet(
            $organization,
            $billing,
            $plans->enterprisePriceMinor($organization),
            'enterprise',
            'queue_enterprise',
            'queue-enterprise-'.$organization->id.'-'.now()->format('Y-m-d-His'),
            'Ladill Queue Enterprise — monthly subscription',
            'Welcome to Queue Enterprise — active for one month.',
            $plans->activeBranchCount($organization),
        );
    }

    public function subscribePrepaid(Request $request, PlanService $plans, BillingClient $billing): RedirectResponse
    {
        $this->authorizeAbility($request, 'settings.manage');
        $validated = $request->validate([
            'plan' => ['required', 'in:pro,enterprise'],
            'months' => ['required', 'integer', 'in:6,12,24'],
        ]);

        $organization = $this->organization($request);
        if ($plans->hasPaidPlan($organization)) {
            return redirect()->route('qms.pro.index')
                ->with('success', 'Your organization already has an active paid plan.');
        }

        $plan = $validated['plan'];
        $months = (int) $validated['months'];

        if ($plan === 'enterprise' && ! $plans->canSubscribeEnterprise($organization)) {
            $min = (int) config('qms.enterprise.min_branches', 2);

            return redirect()->route('qms.pro.index')
                ->with('error', "Enterprise billing requires at least {$min} active branches.");
        }

        $monthlyMinor = $plan === 'enterprise'
            ? $plans->enterprisePriceMinor($organization)
            : $plans->proPriceMinor($organization);
        $amountMinor = $monthlyMinor * $months;
        $branches = $plans->activeBranchCount($organization);

        $metadata = [
            'organization_id' => $organization->id,
            'billed_branches' => $branches,
        ];
        if ($plan === 'enterprise') {
            $metadata['enterprise_billed_branches'] = $branches;
        } else {
            $metadata['pro_billed_branches'] = $branches;
        }

        try {
            $checkout = $billing->initiatePlanCheckout(
                $organization->owner_ref,
                $plan,
                $months,
                $amountMinor,
                route('qms.pro.paystack.callback'),
                $metadata,
            );
        } catch (\Throwable) {
            return redirect()->route('qms.pro.index')
                ->with('error', 'Could not start Paystack checkout. Please try again.');
        }

        $url = trim((string) ($checkout['checkout_url'] ?? ''));
        if ($url === '') {
            return redirect()->route('qms.pro.index')
                ->with('error', 'Paystack did not return a checkout URL.');
        }

        return redirect()->away($url);
    }

    public function paystackCallback(Request $request, BillingClient $billing, PlanService $plans): RedirectResponse
    {
        $reference = (string) $request->query('reference', '');
        if ($reference === '') {
            return redirect()->route('qms.pro.index')->with('error', 'Missing payment reference.');
        }

        try {
            $result = $billing->verifyPlanCheckout($reference);
        } catch (\Throwable) {
            return redirect()->route('qms.pro.index')
                ->with('error', 'Could not verify payment. Contact support with reference: '.$reference);
        }

        if (! ($result['paid'] ?? false)) {
            return redirect()->route('qms.pro.index')
                ->with('error', 'Payment was not completed.');
        }

        $metadata = (array) ($result['metadata'] ?? []);
        $organization = Organization::query()->find((int) ($metadata['organization_id'] ?? 0));
        if (! $organization) {
            return redirect()->route('qms.pro.index')
                ->with('error', 'Organization not found for this payment.');
        }

        $this->authorizeAbility($request, 'settings.manage');
        if ($this->organization($request)->id !== $organization->id) {
            abort(403);
        }

        $plan = (string) ($result['plan'] ?? 'pro');
        $months = (int) ($result['months'] ?? 0);
        $branches = isset($metadata['billed_branches'])
            ? (int) $metadata['billed_branches']
            : (isset($metadata['pro_billed_branches'])
                ? (int) $metadata['pro_billed_branches']
                : (isset($metadata['enterprise_billed_branches'])
                    ? (int) $metadata['enterprise_billed_branches']
                    : null));

        $this->activatePrepaidPlan($organization, $plan, $months, $branches);

        $label = $plan === 'enterprise' ? 'Queue Enterprise' : 'Queue Pro';

        return redirect()->route('qms.pro.index')
            ->with('success', "{$label} is active for {$months} months.");
    }

    private function chargeMonthlyWallet(
        Organization $organization,
        BillingClient $billing,
        int $priceMinor,
        string $plan,
        string $billingSource,
        string $reference,
        string $description,
        string $successMessage,
        ?int $billedBranches = null,
    ): RedirectResponse {
        try {
            if (! $billing->canAfford($organization->owner_ref, $priceMinor)) {
                return redirect()->route('qms.pro.index')
                    ->with('error', 'Insufficient wallet balance. Top up your Ladill wallet to upgrade.');
            }

            $charged = $billing->debit(
                $organization->owner_ref,
                $priceMinor,
                $billingSource,
                $reference,
                $description,
            );
        } catch (\Throwable) {
            return redirect()->route('qms.pro.index')
                ->with('error', 'Could not process upgrade. Please try again.');
        }

        if (! $charged) {
            return redirect()->route('qms.pro.index')
                ->with('error', 'Insufficient wallet balance. Top up your Ladill wallet to upgrade.');
        }

        $settings = $organization->settings ?? [];
        $settings['plan'] = $plan;
        $settings['auto_renew'] = true;
        $settings['billing_method'] = 'wallet_monthly';
        $settings['plan_expires_at'] = now()
            ->addDays((int) config('qms.pro.period_days', 30))
            ->toIso8601String();
        $this->applyBilledBranches($settings, $plan, $billedBranches);
        unset($settings['plan_renewal_error']);
        $organization->update(['settings' => $settings]);

        return redirect()->route('qms.pro.index')->with('success', $successMessage);
    }

    private function activatePrepaidPlan(
        Organization $organization,
        string $plan,
        int $months,
        ?int $billedBranches = null,
    ): void {
        $settings = $organization->settings ?? [];
        $settings['plan'] = $plan;
        $settings['auto_renew'] = false;
        $settings['billing_method'] = 'paystack_prepaid';
        $settings['plan_expires_at'] = now()->addMonths($months)->toIso8601String();
        $this->applyBilledBranches($settings, $plan, $billedBranches);
        unset($settings['plan_renewal_error']);
        $organization->update(['settings' => $settings]);
    }

    /**
     * @param  array<string, mixed>  $settings
     */
    private function applyBilledBranches(array &$settings, string $plan, ?int $billedBranches): void
    {
        if ($billedBranches === null) {
            return;
        }

        if ($plan === 'enterprise') {
            $settings['enterprise_billed_branches'] = $billedBranches;
            unset($settings['pro_billed_branches']);
        } else {
            $settings['pro_billed_branches'] = $billedBranches;
            unset($settings['enterprise_billed_branches']);
        }
    }
}