<?php

namespace App\Services;

use App\Jobs\SendEmailTemplateJob;
use App\Models\Activity;
use App\Models\Client;
use App\Models\ClientCase;
use App\Models\Contract;
use App\Models\Decision;
use App\Models\Email;
use App\Models\EmailLog;
use App\Models\EmailLogStatus;
use App\Models\EmailTemplate;

class AutoMailDispatcher
{
    public function __construct(public EmailTemplateRenderer $renderer) {}

    /**
     * Attempt to queue an auto mail for the given activity based on its decision/template.
     * Returns array with either ['queued' => true, 'log_id' => int] or ['skipped' => 'reason'].
     */
    public function maybeQueue(Activity $activity, bool $sendFlag = true): array
    {
        $decision = $activity->decision;
        if (! $sendFlag || ! $decision || ! $decision->auto_mail || ! $decision->email_template_id) {
            return ['skipped' => 'disabled'];
        }

        /** @var EmailTemplate|null $template */
        $template = EmailTemplate::query()->find($decision->email_template_id);
        if (! $template || ! $template->active) {
            return ['skipped' => 'no-template'];
        }

        // Resolve context
        $clientCase = $activity->clientCase; /** @var ClientCase|null $clientCase */
        $contract = $activity->contract; /** @var Contract|null $contract */
        $client = $clientCase?->client; /** @var Client|null $client */
        $person = $clientCase?->person; /** @var \App\Models\Person\Person|null $person */

        // Validate required entity types from template
        $required = (array) ($template->entity_types ?? []);
        if (in_array('client', $required, true) && ! $client) {
            return ['skipped' => 'missing-client'];
        }
        if (in_array('client_case', $required, true) && ! $clientCase) {
            return ['skipped' => 'missing-client-case'];
        }
        if (in_array('contract', $required, true) && ! $contract) {
            return ['skipped' => 'missing-contract'];
        }
        if (in_array('person', $required, true) && ! $person) {
            return ['skipped' => 'missing-person'];
        }

        // Resolve eligible recipients: client's person emails with receive_auto_mails = true
        $recipients = [];
        if ($client && $client->person) {
            $recipients = Email::query()
                ->where('person_id', $client->person->id)
                ->where('is_active', true)
                ->where('receive_auto_mails', true)
                ->pluck('value')
                ->map(fn ($v) => strtolower(trim((string) $v)))
                ->filter(fn ($v) => filter_var($v, FILTER_VALIDATE_EMAIL))
                ->unique()
                ->values()
                ->all();
        }
        if (empty($recipients)) {
            return ['skipped' => 'no-recipients'];
        }

        // Ensure related names are available without extra queries
        $activity->loadMissing(['action', 'decision']);

        // Render content
        $rendered = $this->renderer->render([
            'subject' => (string) $template->subject_template,
            'html' => (string) $template->html_template,
            'text' => (string) $template->text_template,
        ], [
            'client' => $client,
            'client_case' => $clientCase,
            'contract' => $contract,
            'person' => $person,
            'activity' => $activity,
            'extra' => [],
        ]);

        // Create the log and body
        $log = new EmailLog;
        $log->fill([
            'uuid' => (string) \Str::uuid(),
            'template_id' => $template->id,
            'to_email' => (string) ($recipients[0] ?? ''),
            'to_recipients' => $recipients,
            'subject' => (string) ($rendered['subject'] ?? $template->subject_template ?? ''),
            'body_html_hash' => $rendered['html'] ? hash('sha256', $rendered['html']) : null,
            'body_text_preview' => isset($rendered['text']) ? mb_strimwidth((string) $rendered['text'], 0, 4096) : null,
            'embed_mode' => 'base64',
            'status' => EmailLogStatus::Queued,
            'queued_at' => now(),
            'client_id' => $client?->id,
            'client_case_id' => $clientCase?->id,
            'contract_id' => $contract?->id,
        ]);
        $log->save();

        $log->body()->create([
            'body_html' => (string) ($rendered['html'] ?? ''),
            'body_text' => (string) ($rendered['text'] ?? ''),
            'inline_css' => true,
        ]);

        dispatch(new SendEmailTemplateJob($log->id));

        return ['queued' => true, 'log_id' => $log->id];
    }
}