<?php

namespace App\Http\Controllers;

use App\Models\Contact;
use App\Models\ContactGroup;
use Illuminate\Contracts\View\View;
use Illuminate\Http\RedirectResponse;
use Illuminate\Http\Request;
use Illuminate\Support\Str;
use Illuminate\Validation\Rule;

class ContactGroupController extends Controller
{
    public function store(Request $request): RedirectResponse
    {
        $validated = $request->validate([
            'name' => ['required', 'string', 'max:255', Rule::unique('contact_groups', 'name')->whereNull('deleted_at')],
            'description' => ['nullable', 'string'],
        ]);

        ContactGroup::query()->create([
            'source' => 'local',
            'name' => $validated['name'],
            'slug' => $this->uniqueSlug($validated['name']),
            'description' => $validated['description'] ?? null,
            'is_favorite' => $request->boolean('is_favorite'),
        ]);

        return redirect()
            ->route('contacts.index')
            ->with('status', 'Groupe cree.');
    }

    public function edit(ContactGroup $contactGroup): View
    {
        $this->ensureLocalGroup($contactGroup);

        return view('contact-groups.edit', [
            'group' => $contactGroup->load('contacts')->loadCount('contacts'),
            'contacts' => Contact::query()
                ->with('phoneNumbers')
                ->orderBy('last_name')
                ->orderBy('first_name')
                ->get(),
            'selectedContactIds' => $contactGroup->contacts->pluck('id')->all(),
        ]);
    }

    public function update(Request $request, ContactGroup $contactGroup): RedirectResponse
    {
        $this->ensureLocalGroup($contactGroup);

        $validated = $request->validate([
            'name' => [
                'required',
                'string',
                'max:255',
                Rule::unique('contact_groups', 'name')->ignore($contactGroup)->whereNull('deleted_at'),
            ],
            'description' => ['nullable', 'string'],
            'contact_ids' => ['array'],
            'contact_ids.*' => [Rule::exists('contacts', 'id')->whereNull('deleted_at')],
        ]);

        $contactGroup->update([
            'name' => $validated['name'],
            'slug' => $this->uniqueSlug($validated['name'], $contactGroup),
            'description' => $validated['description'] ?? null,
            'is_favorite' => $request->boolean('is_favorite'),
        ]);

        if ($request->has('members_submitted')) {
            $contactGroup->contacts()->sync($validated['contact_ids'] ?? []);
        }

        return redirect()
            ->route('contacts.index', ['group' => $contactGroup->id])
            ->with('status', 'Groupe modifie.');
    }

    public function destroy(ContactGroup $contactGroup): RedirectResponse
    {
        $this->ensureLocalGroup($contactGroup);

        $contactGroup->contacts()->detach();
        $contactGroup->delete();

        return redirect()
            ->route('contacts.index')
            ->with('status', 'Groupe supprime.');
    }

    private function uniqueSlug(string $name, ?ContactGroup $ignore = null): string
    {
        $baseSlug = Str::slug($name);
        $baseSlug = $baseSlug === '' ? 'groupe' : $baseSlug;
        $slug = $baseSlug;
        $index = 2;

        while (ContactGroup::query()
            ->where('slug', $slug)
            ->when($ignore, fn ($query) => $query->whereKeyNot($ignore->id))
            ->exists()
        ) {
            $slug = $baseSlug.'-'.$index;
            $index++;
        }

        return $slug;
    }

    private function ensureLocalGroup(ContactGroup $contactGroup): void
    {
        abort_if($contactGroup->source !== 'local', 403, 'Les groupes importes ne sont pas modifiables localement.');
    }
}