<?php

namespace Modules\Content\Http\Controllers;

use App\Http\Controllers\Controller;
use Illuminate\Http\RedirectResponse;
use Illuminate\Http\Request;
use Illuminate\Support\Facades\DB;
use Illuminate\Support\Str;
use Illuminate\Validation\Rule;
use Illuminate\View\View;
use Modules\Content\Models\ContentDocument;
use Modules\Content\Models\ContentType;

final class ContentDocumentController extends Controller
{
    public function index(Request $request): View
    {
        $documents = ContentDocument::query()
            ->with('type')
            ->withCount('placements')
            ->when($request->string('type')->isNotEmpty(), fn ($query) => $query->whereHas('type', fn ($type) => $type->where('key', $request->string('type')->toString())))
            ->when($request->string('status')->isNotEmpty(), fn ($query) => $query->where('status', $request->string('status')->toString()))
            ->when($request->string('search')->isNotEmpty(), fn ($query) => $query->where('title', 'like', '%'.$request->string('search')->toString().'%'))
            ->orderBy('title')
            ->paginate(30)
            ->withQueryString();

        return view('content::admin.index', [
            'documents' => $documents,
            'types' => ContentType::query()->where('is_active', true)->orderBy('name')->get(),
        ]);
    }

    public function create(Request $request): View
    {
        $types = ContentType::query()->where('is_active', true)->orderBy('name')->get();
        $selectedType = $types->firstWhere('id', (int) $request->integer('type')) ?? $types->first();

        return view('content::admin.form', [
            'document' => new ContentDocument(['status' => 'draft', 'data' => []]),
            'types' => $types,
            'selectedType' => $selectedType,
        ]);
    }

    public function store(Request $request): RedirectResponse
    {
        $validated = $this->validateDocument($request);
        $type = ContentType::query()->where('is_active', true)->findOrFail($validated['content_type_id']);

        $document = ContentDocument::query()->create([
            'content_type_id' => $type->id,
            'title' => $validated['title'],
            'slug' => $this->uniqueSlug($validated['slug'] ?: $validated['title']),
            'status' => $validated['status'],
            'published_at' => $validated['status'] === 'published' ? ($validated['published_at'] ?? now()) : null,
            'expires_at' => $validated['expires_at'] ?? null,
            'data' => json_decode($validated['data_json'], true, 512, JSON_THROW_ON_ERROR),
            'created_by' => $request->user()?->id,
            'updated_by' => $request->user()?->id,
        ]);

        return redirect()->route('content.documents.edit', $document)->with('status', 'Content document created.');
    }

    public function edit(ContentDocument $document): View
    {
        $document->load('type', 'placements');

        return view('content::admin.form', [
            'document' => $document,
            'types' => ContentType::query()->where('is_active', true)->orderBy('name')->get(),
            'selectedType' => $document->type,
        ]);
    }

    public function update(Request $request, ContentDocument $document): RedirectResponse
    {
        $validated = $this->validateDocument($request, $document);

        $document->update([
            'content_type_id' => $validated['content_type_id'],
            'title' => $validated['title'],
            'slug' => $this->uniqueSlug($validated['slug'] ?: $validated['title'], $document),
            'status' => $validated['status'],
            'published_at' => $validated['status'] === 'published' ? ($validated['published_at'] ?? $document->published_at ?? now()) : null,
            'expires_at' => $validated['expires_at'] ?? null,
            'data' => json_decode($validated['data_json'], true, 512, JSON_THROW_ON_ERROR),
            'updated_by' => $request->user()?->id,
        ]);

        return back()->with('status', 'Content document updated.');
    }

    public function duplicate(Request $request, ContentDocument $document): RedirectResponse
    {
        $copy = $document->replicate(['slug', 'status', 'published_at', 'created_by', 'updated_by']);
        $copy->title = $document->title.' copy';
        $copy->slug = $this->uniqueSlug($copy->title);
        $copy->status = 'draft';
        $copy->published_at = null;
        $copy->created_by = $request->user()?->id;
        $copy->updated_by = $request->user()?->id;
        $copy->save();

        return redirect()->route('content.documents.edit', $copy)->with('status', 'Independent draft copy created.');
    }

    public function destroy(ContentDocument $document): RedirectResponse
    {
        if ($document->placements()->exists()) {
            return back()->withErrors(['document' => 'Remove this document from every page before deleting it.']);
        }

        $document->delete();

        return redirect()->route('content.index')->with('status', 'Content document deleted.');
    }

    private function validateDocument(Request $request, ?ContentDocument $document = null): array
    {
        return $request->validate([
            'content_type_id' => ['required', 'integer', Rule::exists('content_types', 'id')->where('is_active', true)],
            'title' => ['required', 'string', 'max:255'],
            'slug' => ['nullable', 'string', 'max:255'],
            'status' => ['required', Rule::in(['draft', 'published'])],
            'published_at' => ['nullable', 'date'],
            'expires_at' => ['nullable', 'date', 'after:published_at'],
            'data_json' => ['required', 'json'],
        ]);
    }

    private function uniqueSlug(string $value, ?ContentDocument $except = null): string
    {
        $base = Str::slug($value) ?: 'content-document';
        $slug = $base;
        $suffix = 2;

        while (ContentDocument::withTrashed()->where('slug', $slug)->when($except, fn ($query) => $query->whereKeyNot($except->getKey()))->exists()) {
            $slug = $base.'-'.$suffix++;
        }

        return $slug;
    }
}