<?php

namespace App\Http\Controllers\Admin;

use App\Http\Controllers\Controller;
use App\Http\Requests\Admin\StoreKnowledgeItemRequest;
use App\Jobs\ReindexKnowledgeItemJob;
use App\Models\Category;
use App\Models\KnowledgeItem;
use App\Services\KnowledgeBase\AuditService;
use App\Services\KnowledgeBase\IngestionService;
use Illuminate\Http\RedirectResponse;
use Illuminate\Http\Request;
use Illuminate\View\View;
use RuntimeException;

class KnowledgeItemController extends Controller
{
    public function __construct(
        private readonly AuditService $auditService,
        private readonly IngestionService $ingestionService,
    ) {}

    public function index(Request $request): View
    {
        $query = KnowledgeItem::with('category')
            ->withTrashed();

        if ($request->filled('category_id')) {
            $query->where('category_id', $request->category_id);
        }

        if ($request->filled('item_type')) {
            $query->where('item_type', $request->item_type);
        }

        if ($request->filled('search')) {
            $query->where(function ($q) use ($request) {
                $q->where('title', 'like', '%' . $request->search . '%')
                  ->orWhere('content', 'like', '%' . $request->search . '%');
            });
        }

        $items      = $query->latest()->paginate(20)->withQueryString();
        $categories = Category::active()->ordered()->get();
        $typeLabels = KnowledgeItem::typeLabels();

        return view('admin.knowledge-items.index', compact('items', 'categories', 'typeLabels'));
    }

    public function create(Request $request): View
    {
        $categories   = Category::active()->ordered()->get();
        $typeLabels   = KnowledgeItem::typeLabels();
        $prefillData  = $request->only(['category_id', 'item_type', 'title', 'content']);
        // prefillData berguna bila convert dari feedback

        return view('admin.knowledge-items.create', compact('categories', 'typeLabels', 'prefillData'));
    }

    public function store(StoreKnowledgeItemRequest $request): RedirectResponse
    {
        $data = $request->validated();
        $data['created_by'] = auth()->id();
        $data['updated_by'] = auth()->id();

        $item = KnowledgeItem::create($data);

        $this->auditService->knowledgeItemCreated($item);

        // Embed secara async
        ReindexKnowledgeItemJob::dispatch($item->id);

        return redirect()
            ->route('admin.knowledge-items.show', $item)
            ->with('success', "Knowledge item '{$item->title}' berjaya dicipta dan sedang di-embed.");
    }

    public function show(KnowledgeItem $knowledgeItem): View
    {
        $knowledgeItem->load('category', 'creator');

        return view('admin.knowledge-items.show', compact('knowledgeItem'));
    }

    public function edit(KnowledgeItem $knowledgeItem): View
    {
        $categories = Category::active()->ordered()->get();
        $typeLabels = KnowledgeItem::typeLabels();

        return view('admin.knowledge-items.edit', compact('knowledgeItem', 'categories', 'typeLabels'));
    }

    public function update(StoreKnowledgeItemRequest $request, KnowledgeItem $knowledgeItem): RedirectResponse
    {
        $oldValues = $knowledgeItem->only(['title', 'content', 'is_active']);

        $data = $request->validated();
        $data['updated_by'] = auth()->id();

        $knowledgeItem->update($data);

        $this->auditService->knowledgeItemUpdated($knowledgeItem, $oldValues);

        // Re-embed kerana kandungan mungkin berubah
        ReindexKnowledgeItemJob::dispatch($knowledgeItem->id);

        return redirect()
            ->route('admin.knowledge-items.show', $knowledgeItem)
            ->with('success', 'Knowledge item berjaya dikemaskini dan sedang di-embed semula.');
    }

    public function toggleStatus(KnowledgeItem $knowledgeItem): RedirectResponse
    {
        $newStatus = !$knowledgeItem->is_active;

        $knowledgeItem->update(['is_active' => $newStatus]);

        if (!$newStatus && $knowledgeItem->qdrant_point_id) {
            $this->ingestionService->deactivateKnowledgeItemInQdrant($knowledgeItem);
            $this->auditService->knowledgeItemDeactivated($knowledgeItem);
        } elseif ($newStatus) {
            // Reactivate — update payload Qdrant
            ReindexKnowledgeItemJob::dispatch($knowledgeItem->id);
        }

        $status = $newStatus ? 'diaktifkan' : 'dinyahaktifkan';

        return back()->with('success', "Item '{$knowledgeItem->title}' telah {$status}.");
    }

    public function reindex(KnowledgeItem $knowledgeItem): RedirectResponse
    {
        ReindexKnowledgeItemJob::dispatch($knowledgeItem->id);

        return back()->with('success', 'Re-embed telah dimulakan.');
    }

    public function destroy(KnowledgeItem $knowledgeItem): RedirectResponse
    {
        // Deactivate dalam Qdrant dulu
        if ($knowledgeItem->qdrant_point_id) {
            $this->ingestionService->deactivateKnowledgeItemInQdrant($knowledgeItem);
        }

        $knowledgeItem->delete(); // SoftDelete

        return redirect()
            ->route('admin.knowledge-items.index')
            ->with('success', 'Knowledge item telah dipadam.');
    }
}