<?php

namespace App\Http\Controllers\Admin;

use App\Http\Controllers\Admin\Concerns\ScopedToTenant;
use App\Http\Controllers\Controller;
use App\Models\AuditLog;
use App\Models\DirectoryUser;
use App\Models\Template;
use App\Models\TemplateVersion;
use App\Signature\SignatureBuilder;
use App\Signature\TemplateRenderer;
use App\Signature\TemplateSanitizer;
use App\Signature\VariableMap;
use Illuminate\Http\JsonResponse;
use Illuminate\Http\RedirectResponse;
use Illuminate\Http\Request;
use Illuminate\Support\Facades\DB;
use Illuminate\View\View;

/**
 * Templates : les éditeurs modifient un brouillon, les administrateurs le publient.
 * L'API ne sert que le contenu publié (html_full / html_short).
 */
class TemplateController extends Controller
{
    use ScopedToTenant;

    public function __construct(private readonly TemplateSanitizer $sanitizer) {}

    public function index(): View
    {
        $templates = Template::where('tenant_id', $this->tenantId())
            ->withCount('assignments')
            ->orderByDesc('is_default')->orderBy('name')
            ->get();

        return view('admin.templates.index', compact('templates'));
    }

    public function create(): View
    {
        return view('admin.templates.edit', [
            'template' => new Template([
                'draft_html_full' => file_get_contents(database_path('seeders/templates/agents-full.html')),
                'draft_html_short' => file_get_contents(database_path('seeders/templates/agents-short.html')),
            ]),
            'versions' => collect(),
            'variables' => VariableMap::FIELDS,
            'previewAgent' => $this->defaultPreviewAgent(),
        ]);
    }

    public function store(Request $request): RedirectResponse
    {
        $data = $this->validated($request);
        $template = Template::create($data + ['tenant_id' => $this->tenantId()]);
        AuditLog::record('admin', $this->actor(), 'template.create', $template, ['name' => $template->name]);

        return redirect()->route('admin.templates.edit', $template)->with('status', 'Template créé (brouillon non publié).');
    }

    public function edit(Template $template): View
    {
        $this->ensureTenant($template);

        return view('admin.templates.edit', [
            'template' => $template,
            'versions' => $template->versions()->with('publisher:id,name')->orderByDesc('version')->limit(20)->get(),
            'variables' => VariableMap::FIELDS,
            'previewAgent' => $this->defaultPreviewAgent(),
        ]);
    }

    public function update(Request $request, Template $template): RedirectResponse
    {
        $this->ensureTenant($template);
        $data = $this->validated($request);
        $template->fill($data);
        $changed = array_keys($template->getDirty());
        $template->save();
        AuditLog::record('admin', $this->actor(), 'template.update', $template, ['fields' => $changed]);

        return back()->with('status', 'Brouillon enregistré.');
    }

    /** Aperçu du brouillon en cours de saisie (non enregistré) sur un agent réel. */
    public function preview(Request $request, SignatureBuilder $builder): JsonResponse
    {
        $data = $request->validate([
            'html' => ['nullable', 'string', 'max:100000'],
            'variant' => ['required', 'in:full,short'],
            'agent_id' => ['nullable', 'integer'],
        ]);

        $agent = isset($data['agent_id'])
            ? DirectoryUser::where('tenant_id', $this->tenantId())->find($data['agent_id'])
            : $this->defaultPreviewAgent();
        abort_unless($agent, 422, 'Aucun agent pour l\'aperçu.');

        $html = $this->sanitizer->clean((string) ($data['html'] ?? ''));

        return response()->json([
            'html' => $builder->preview($agent, $html, $data['variant']),
            'agent' => $agent->display_name.' — '.$agent->mail,
            'variables' => (new TemplateRenderer)->variables($html),
        ]);
    }

    public function publish(Template $template): RedirectResponse
    {
        $this->ensureTenant($template);
        abort_if(blank($template->draft_html_full) && blank($template->html_full), 422, 'Le template complet est vide.');

        $template->publish(auth()->user());
        AuditLog::record('admin', $this->actor(), 'template.publish', $template, ['version' => $template->published_version]);

        return back()->with('status', "Version {$template->published_version} publiée : elle est servie immédiatement par l'add-in.");
    }

    /** Recharge une version publiée dans le brouillon (il faut republier ensuite). */
    public function restore(Template $template, TemplateVersion $version): RedirectResponse
    {
        $this->ensureTenant($template);
        abort_unless($version->template_id === $template->id, 404);

        $template->update(['draft_html_full' => $version->html_full, 'draft_html_short' => $version->html_short]);
        AuditLog::record('admin', $this->actor(), 'template.restore', $template, ['version' => $version->version]);

        return back()->with('status', "Version {$version->version} rechargée dans le brouillon. Publiez pour l'appliquer.");
    }

    public function makeDefault(Template $template): RedirectResponse
    {
        $this->ensureTenant($template);
        abort_if(blank($template->html_full), 422, 'Publiez le template avant d\'en faire le template par défaut.');

        DB::transaction(function () use ($template) {
            Template::where('tenant_id', $this->tenantId())->update(['is_default' => false]);
            $template->update(['is_default' => true]);
        });
        AuditLog::record('admin', $this->actor(), 'template.default', $template);

        return back()->with('status', "« {$template->name} » est maintenant le template par défaut.");
    }

    public function destroy(Template $template): RedirectResponse
    {
        $this->ensureTenant($template);
        abort_if($template->is_default, 422, 'Le template par défaut ne peut pas être supprimé.');

        AuditLog::record('admin', $this->actor(), 'template.delete', $template, ['name' => $template->name]);
        $template->delete(); // les affectations sont supprimées en cascade

        return redirect()->route('admin.templates.index')->with('status', 'Template supprimé.');
    }

    private function validated(Request $request): array
    {
        $data = $request->validate([
            'name' => ['required', 'string', 'max:120'],
            'description' => ['nullable', 'string', 'max:500'],
            'draft_html_full' => ['required', 'string', 'max:100000'],
            'draft_html_short' => ['nullable', 'string', 'max:100000'],
        ]);
        $data['draft_html_full'] = $this->sanitizer->clean($data['draft_html_full']);
        $data['draft_html_short'] = isset($data['draft_html_short']) ? $this->sanitizer->clean($data['draft_html_short']) : null;

        return $data;
    }

    /** Agent utilisé par défaut pour l'aperçu : l'administrateur lui-même. */
    private function defaultPreviewAgent(): ?DirectoryUser
    {
        $user = auth()->user();

        return DirectoryUser::where('tenant_id', $user->tenant_id)->where('entra_oid', $user->entra_oid)->first()
            ?? DirectoryUser::where('tenant_id', $user->tenant_id)->orderBy('display_name')->first();
    }
}