<?php

namespace App\Livewire\Admin;

use App\Models\MailTemplate;
use App\Services\Mail\MailTemplateRenderer;
use Livewire\Attributes\Layout;
use Livewire\Attributes\Validate;
use Livewire\Component;

/**
 * The answers an operator gives over and over, written once.
 *
 * Most customer questions are the same five questions, and typing the answer
 * again every time is how two customers get told two different things about the
 * same subject.
 *
 * A template is not sent from here and never sent by itself: it is inserted into
 * the compose field on a customer's page, placeholders already filled from that
 * customer's record, and the last two sentences are still the operator's to
 * write. What goes out is what they saw and edited.
 *
 * Creating happens in the form on this page — R20 exempts a create form that IS
 * the page. Editing happens in a modal (Admin\EditMailTemplate), because a
 * textarea growing inside a table row is the row-height jump R20 exists to stop.
 */
#[Layout('layouts.admin')]
class MailTemplates extends Component
{
    #[Validate('required|string|max:255')]
    public string $name = '';

    #[Validate('required|string|max:255')]
    public string $subject = '';

    #[Validate('required|string|max:5000')]
    public string $body = '';

    public function mount(): void
    {
        $this->authorize('customers.manage');
    }

    public function create(): void
    {
        $this->authorize('customers.manage');

        $data = $this->validate();

        MailTemplate::create([
            'name' => trim($data['name']),
            'subject' => trim($data['subject']),
            'body' => $data['body'],
            // At the end of the list, where a new one belongs until somebody
            // decides otherwise.
            'sort' => (int) MailTemplate::query()->max('sort') + 10,
            'active' => true,
        ]);

        $this->reset(['name', 'subject', 'body']);
        $this->dispatch('notify', message: __('templates.created'));
    }

    /**
     * Retire one, or bring it back.
     *
     * Not deleted: an answer that is no longer given is still the answer
     * somebody was given last year, and the register of sent mail refers to it.
     */
    public function toggleActive(string $uuid): void
    {
        $this->authorize('customers.manage');

        $template = MailTemplate::query()->where('uuid', $uuid)->first();

        if ($template !== null) {
            $template->update(['active' => ! $template->active]);
        }
    }

    /** Move one up or down the list an operator picks from. */
    public function move(string $uuid, int $by): void
    {
        $this->authorize('customers.manage');

        $template = MailTemplate::query()->where('uuid', $uuid)->first();

        if ($template !== null) {
            $template->update(['sort' => max(0, $template->sort + $by)]);
        }
    }

    public function render()
    {
        $this->authorize('customers.manage');

        return view('livewire.admin.mail-templates', [
            'templates' => MailTemplate::query()->orderBy('sort')->orderBy('name')->get(),
            // The list IS the documentation: a token added to the renderer
            // appears here without anybody remembering to write it down twice.
            'placeholders' => MailTemplateRenderer::PLACEHOLDERS,
        ]);
    }
}