<?php

declare(strict_types=1);

namespace App\Services;

use App\Enums\EmailLogStatus;
use App\Enums\EmailTemplateType;
use App\Jobs\SendTransactionalEmail;
use App\Mail\TransactionalMail;
use App\Models\EmailLog;
use App\Models\Organisation;
use App\Models\OrganisationEmailSettings;
use App\Models\OrganisationEmailTemplate;

final class EmailService
{
    /**
     * Queue a transactional email.
     * This is the central entry point for sending all emails in Crewli.
     */
    public function send(
        EmailTemplateType $type,
        string $recipientEmail,
        string $recipientName,
        array $variables = [],
        ?string $actionUrl = null,
        ?Organisation $organisation = null,
        ?string $eventId = null,
        ?string $personId = null,
        ?string $userId = null,
        ?string $triggeredByUserId = null,
    ): EmailLog {
        $template = $this->resolveTemplate($type, $organisation);
        $template = $this->substituteVariables($template, $variables);
        $branding = $this->resolveBranding($organisation);

        $emailLog = EmailLog::create([
            'organisation_id' => $organisation?->id,
            'event_id' => $eventId,
            'person_id' => $personId,
            'user_id' => $userId,
            'recipient_email' => $recipientEmail,
            'recipient_name' => $recipientName,
            'mailable_class' => TransactionalMail::class,
            'template_type' => $type->value,
            'subject' => $template['subject'],
            'status' => EmailLogStatus::QUEUED->value,
            'queued_at' => now(),
            'triggered_by_user_id' => $triggeredByUserId,
        ]);

        SendTransactionalEmail::dispatch(
            emailLogId: $emailLog->id,
            type: $type,
            recipientEmail: $recipientEmail,
            recipientName: $recipientName,
            template: $template,
            branding: $branding,
            actionUrl: $actionUrl,
        );

        return $emailLog;
    }

    /**
     * Resolve template: org override or system defaults.
     *
     * @return array{subject: string, heading: string|null, body_text: string, button_text: string|null, is_custom: bool}
     */
    public function resolveTemplate(EmailTemplateType $type, ?Organisation $organisation = null): array
    {
        if ($organisation) {
            $override = OrganisationEmailTemplate::where('organisation_id', $organisation->id)
                ->where('type', $type->value)
                ->first();

            if ($override) {
                return [
                    'subject' => $override->subject,
                    'heading' => $override->heading,
                    'body_text' => $override->body_text,
                    'button_text' => $override->button_text,
                    'is_custom' => true,
                ];
            }
        }

        $defaults = $type->defaults();
        $defaults['is_custom'] = false;

        return $defaults;
    }

    /**
     * Resolve organisation branding or system defaults.
     *
     * @return array{logo_url: string|null, primary_color: string, secondary_color: string, footer_text: string, reply_to_email: string|null, reply_to_name: string|null}
     */
    public function resolveBranding(?Organisation $organisation = null): array
    {
        $defaults = [
            'logo_url' => null,
            'primary_color' => '#6366F1',
            'secondary_color' => '#4F46E5',
            'footer_text' => '© ' . date('Y') . ' Crewli',
            'reply_to_email' => null,
            'reply_to_name' => null,
        ];

        if (! $organisation) {
            return $defaults;
        }

        $settings = OrganisationEmailSettings::where('organisation_id', $organisation->id)->first();

        if (! $settings) {
            $defaults['footer_text'] = '© ' . date('Y') . ' ' . $organisation->name;

            return $defaults;
        }

        return [
            'logo_url' => $settings->logo_url ?? $defaults['logo_url'],
            'primary_color' => $settings->primary_color ?? $defaults['primary_color'],
            'secondary_color' => $settings->secondary_color ?? $defaults['secondary_color'],
            'footer_text' => $settings->footer_text ?? ('© ' . date('Y') . ' ' . $organisation->name),
            'reply_to_email' => $settings->reply_to_email,
            'reply_to_name' => $settings->reply_to_name,
        ];
    }

    /**
     * Get all template types with their current content for an organisation.
     *
     * @return list<array{type: string, label: string, is_custom: bool, subject: string, heading: string|null, body_text: string, button_text: string|null, defaults: array}>
     */
    public function getAllTemplates(?Organisation $organisation = null): array
    {
        $result = [];

        foreach (EmailTemplateType::cases() as $type) {
            $template = $this->resolveTemplate($type, $organisation);
            $template['type'] = $type->value;
            $template['label'] = $type->label();
            $template['defaults'] = $type->defaults();
            $result[] = $template;
        }

        return $result;
    }

    /**
     * Substitute {variable} placeholders in template text.
     */
    private function substituteVariables(array $template, array $variables): array
    {
        foreach ($template as $key => $value) {
            if (is_string($value)) {
                foreach ($variables as $var => $replacement) {
                    $value = str_replace('{' . $var . '}', (string) $replacement, $value);
                }
                $template[$key] = $value;
            }
        }

        return $template;
    }
}