<?php

namespace Dashboard\Unifi\Http\Controllers;

use App\Models\DashboardApp;
use App\Models\Group;
use App\Models\NavItem;
use App\Models\User;
use Dashboard\Unifi\Models\UnifiPageGrant;
use Illuminate\Http\Request;
use Illuminate\Routing\Controller;
use Illuminate\Support\Facades\DB;

/**
 * Super-admin-only endpoints for managing per-page access on unifi
 * pages. Pages here = nav_items where app_id = unifi's DashboardApp row.
 */
class UnifiPagesAccessController extends Controller
{
    public function index()
    {
        $app = DashboardApp::where('slug', 'unifi')->first();
        if (! $app) {
            return response()->json(['pages' => [], 'users' => [], 'groups' => []]);
        }

        $pages = NavItem::where('app_id', $app->id)
            ->where('is_folder', false)
            ->whereNotNull('route_name')
            ->orderBy('sort_order')
            ->get(['id', 'label', 'route_name']);

        $grants = UnifiPageGrant::whereIn('nav_item_id', $pages->pluck('id'))
            ->get()
            ->groupBy('nav_item_id');

        // Only return users that ALREADY have grants. The full users list
        // can be enormous (thousands of rows); the operator adds more via
        // the searchUsers endpoint as needed.
        $grantedUserIds = $grants->flatten(1)->where('grantee_type', 'user')->pluck('grantee_id')->unique();
        $users = User::whereIn('id', $grantedUserIds)->orderBy('name')->get(['id', 'name', 'email']);

        // Groups: always include super-admin groups (locked-on across all
        // pages) plus any group with at least one grant. Other groups are
        // added via searchGroups.
        $grantedGroupIds = $grants->flatten(1)->where('grantee_type', 'group')->pluck('grantee_id')->unique();
        $groups = Group::where(function ($q) use ($grantedGroupIds) {
            $q->where('is_super', true)
              ->orWhereIn('id', $grantedGroupIds);
        })->orderBy('name')->get(['id', 'name', 'is_super']);

        return response()->json([
            'pages' => $pages->map(fn ($p) => [
                'id'         => $p->id,
                'label'      => $p->label,
                'route_name' => $p->route_name,
                'user_ids'   => $grants->get($p->id, collect())->where('grantee_type', 'user')->pluck('grantee_id')->all(),
                'group_ids'  => $grants->get($p->id, collect())->where('grantee_type', 'group')->pluck('grantee_id')->all(),
            ])->values(),
            'users'  => $users,
            'groups' => $groups,
        ]);
    }

    /**
     * Typeahead-style search for users to add to the access matrix.
     * Returns up to 20 matches against name or email. Empty query returns
     * an empty array — caller must enter at least 2 chars.
     */
    public function searchUsers(Request $request)
    {
        $q = trim((string) $request->query('q', ''));
        if (strlen($q) < 2) {
            return response()->json(['users' => []]);
        }

        $users = User::where(function ($w) use ($q) {
            $w->where('name',  'like', '%' . $q . '%')
              ->orWhere('email', 'like', '%' . $q . '%');
        })
            ->orderBy('name')
            ->limit(20)
            ->get(['id', 'name', 'email']);

        return response()->json(['users' => $users]);
    }

    /**
     * Typeahead-style search for groups to add to the access matrix.
     * Excludes super-admin groups (they're already in the matrix and
     * locked-on across every page).
     */
    public function searchGroups(Request $request)
    {
        $q = trim((string) $request->query('q', ''));
        if (strlen($q) < 2) {
            return response()->json(['groups' => []]);
        }

        $groups = Group::where('name', 'like', '%' . $q . '%')
            ->where(function ($w) { $w->where('is_super', false)->orWhereNull('is_super'); })
            ->orderBy('name')
            ->limit(20)
            ->get(['id', 'name', 'is_super']);

        return response()->json(['groups' => $groups]);
    }

    public function update(Request $request, NavItem $navItem)
    {
        $app = DashboardApp::where('slug', 'unifi')->first();
        if (! $app || $navItem->app_id !== $app->id) {
            return response()->json(['error' => 'Not a unifi page.'], 422);
        }

        $data = $request->validate([
            'user_ids'    => 'present|array',
            'user_ids.*'  => 'integer|exists:users,id',
            'group_ids'   => 'present|array',
            'group_ids.*' => 'integer|exists:groups,id',
        ]);

        $grantedBy = $request->user()?->id;

        DB::transaction(function () use ($navItem, $data, $grantedBy) {
            UnifiPageGrant::where('nav_item_id', $navItem->id)->delete();

            $rows = [];
            $now  = now();
            foreach ($data['user_ids']  as $uid) {
                $rows[] = ['nav_item_id' => $navItem->id, 'grantee_type' => 'user',  'grantee_id' => $uid, 'granted_by_user_id' => $grantedBy, 'created_at' => $now, 'updated_at' => $now];
            }
            foreach ($data['group_ids'] as $gid) {
                $rows[] = ['nav_item_id' => $navItem->id, 'grantee_type' => 'group', 'grantee_id' => $gid, 'granted_by_user_id' => $grantedBy, 'created_at' => $now, 'updated_at' => $now];
            }
            if ($rows) UnifiPageGrant::insert($rows);
        });

        return response()->json(['ok' => true]);
    }
}