<?php

namespace App\Services;

use App\Models\Client;
use App\Models\ClientCase;
use App\Models\Contract;
use App\Models\Person\Person;

class EmailTemplateRenderer
{
    /**
     * Render subject and bodies using a simple {{ key }} replacement.
     * Supported entities: client, person, client_case, contract
     *
     * @param  array{subject:string, html?:string|null, text?:string|null}  $template
     * @param  array{client?:Client, person?:Person, client_case?:ClientCase, contract?:Contract, extra?:array}  $ctx
     * @return array{subject:string, html?:string, text?:string}
     */
    public function render(array $template, array $ctx): array
    {
        $map = $this->buildMap($ctx);
        $replacer = static function (?string $input) use ($map): ?string {
            if ($input === null) {
                return null;
            }

            return preg_replace_callback('/{{\s*([a-zA-Z0-9_.]+)\s*}}/', function ($m) use ($map) {
                $key = $m[1];

                return (string) data_get($map, $key, '');
            }, $input);
        };

        return [
            'subject' => $replacer($template['subject']) ?? '',
            'html' => $replacer($template['html'] ?? null) ?? null,
            'text' => $replacer($template['text'] ?? null) ?? null,
        ];
    }

    /**
     * @param  array{client?:Client, person?:Person, client_case?:ClientCase, contract?:Contract, extra?:array}  $ctx
     */
    protected function buildMap(array $ctx): array
    {
        $out = [];
        if (isset($ctx['client'])) {
            $c = $ctx['client'];
            $out['client'] = [
                'id' => data_get($c, 'id'),
                'uuid' => data_get($c, 'uuid'),
            ];
        }
        if (isset($ctx['person'])) {
            $p = $ctx['person'];
            $out['person'] = [
                'first_name' => data_get($p, 'first_name'),
                'last_name' => data_get($p, 'last_name'),
                'full_name' => trim((data_get($p, 'first_name', '')).' '.(data_get($p, 'last_name', ''))),
                'email' => data_get($p, 'email'),
                'phone' => data_get($p, 'phone'),
            ];
        }
        if (isset($ctx['client_case'])) {
            $c = $ctx['client_case'];
            $out['case'] = [
                'id' => data_get($c, 'id'),
                'uuid' => data_get($c, 'uuid'),
                'reference' => data_get($c, 'reference'),
            ];
        }
        if (isset($ctx['contract'])) {
            $co = $ctx['contract'];
            $out['contract'] = [
                'id' => data_get($co, 'id'),
                'uuid' => data_get($co, 'uuid'),
                'reference' => data_get($co, 'reference'),
                'amount' => data_get($co, 'amount'),
            ];
            $meta = data_get($co, 'meta');
            if (is_array($meta)) {
                $out['contract']['meta'] = $meta;
            }
        }
        if (! empty($ctx['extra']) && is_array($ctx['extra'])) {
            $out['extra'] = $ctx['extra'];
        }

        return $out;
    }
}