<?php

declare(strict_types=1);

namespace App\Http\Controllers\Admin;

use App\Http\Controllers\Controller;
use App\Services\EarlyGrowth\ActivityLayer;
use App\Services\EarlyGrowth\AdaptiveTimeWindow;
use App\Services\EarlyGrowth\EarlyGrowth;
use Illuminate\Http\JsonResponse;
use Illuminate\Http\RedirectResponse;
use Illuminate\Http\Request;
use Illuminate\Support\Facades\Cache;
use Illuminate\View\View;

/**
 * EarlyGrowthAdminController  (§14)
 *
 * Admin panel for the Early-Stage Growth System.
 * All toggles are ENV-driven; updating .env requires a deploy.
 * This panel provides a read-only status view plus a cache-flush action.
 *
 * Future v2: wire to a `settings` DB table so admins can toggle without
 * a deploy.  The EarlyGrowth::enabled() contract already supports this.
 */
final class EarlyGrowthAdminController extends Controller
{
    public function __construct(
        private readonly AdaptiveTimeWindow $timeWindow,
        private readonly ActivityLayer      $activityLayer,
    ) {}

    /**
     * GET /admin/early-growth
     * Status dashboard: shows current config, live stats, toggle instructions.
     */
    public function index(): View
    {
        $uploadsPerDay = $this->timeWindow->getUploadsPerDay();

        return view('admin.early-growth.index', [
            'status'         => EarlyGrowth::status(),
            'mode'           => EarlyGrowth::mode(),
            'uploads_per_day' => $uploadsPerDay,
            'window_days'    => $this->timeWindow->getTrendingWindowDays(30),
            'activity'       => $this->activityLayer->getSignals(),
            'cache_keys' => [
                'egs.uploads_per_day',
                'egs.auto_disable_check',
                'egs.spotlight.*',
                'egs.curated.*',
                'egs.grid_filler.*',
                'egs.activity_signals',
                'homepage.fresh.*',
                'discover.trending.*',
                'discover.rising.*',
            ],
            'env_toggles' => [
                ['key' => 'NOVA_EARLY_GROWTH_ENABLED', 'current' => env('NOVA_EARLY_GROWTH_ENABLED', 'false')],
                ['key' => 'NOVA_EARLY_GROWTH_MODE',    'current' => env('NOVA_EARLY_GROWTH_MODE', 'off')],
                ['key' => 'NOVA_EGS_ADAPTIVE_WINDOW',  'current' => env('NOVA_EGS_ADAPTIVE_WINDOW', 'true')],
                ['key' => 'NOVA_EGS_GRID_FILLER',      'current' => env('NOVA_EGS_GRID_FILLER', 'true')],
                ['key' => 'NOVA_EGS_SPOTLIGHT',        'current' => env('NOVA_EGS_SPOTLIGHT', 'true')],
                ['key' => 'NOVA_EGS_ACTIVITY_LAYER',   'current' => env('NOVA_EGS_ACTIVITY_LAYER', 'false')],
            ],
        ]);
    }

    /**
     * DELETE /admin/early-growth/cache
     * Flush all EGS-related cache keys so new config changes take effect immediately.
     */
    public function flushCache(Request $request): RedirectResponse
    {
        $keys = [
            'egs.uploads_per_day',
            'egs.auto_disable_check',
            'egs.activity_signals',
        ];

        // Flush the EGS daily spotlight caches for today
        $today = now()->format('Y-m-d');
        foreach ([6, 12, 18, 24] as $n) {
            Cache::forget("egs.spotlight.{$today}.{$n}");
            Cache::forget("egs.curated.{$today}.{$n}.7");
        }

        // Flush fresh/trending homepage sections
        foreach ([6, 8, 10, 12] as $limit) {
            foreach (['off', 'light', 'aggressive'] as $mode) {
                Cache::forget("homepage.fresh.{$limit}.egs-{$mode}");
                Cache::forget("homepage.fresh.{$limit}.std");
            }
            Cache::forget("homepage.trending.{$limit}");
            Cache::forget("homepage.rising.{$limit}");
        }

        // Flush key keys
        foreach ($keys as $key) {
            Cache::forget($key);
        }

        return redirect()->route('admin.early-growth.index')
            ->with('success', 'Early Growth System cache flushed. Changes will take effect on next page load.');
    }

    /**
     * GET /admin/early-growth/status  (JSON — for monitoring/healthcheck)
     */
    public function status(): JsonResponse
    {
        return response()->json([
            'egs'             => EarlyGrowth::status(),
            'uploads_per_day' => $this->timeWindow->getUploadsPerDay(),
            'window_days'     => $this->timeWindow->getTrendingWindowDays(30),
        ]);
    }
}