<?php

namespace App\Services;

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

class EmailTemplateRenderer
{
    /**
     * Render subject and bodies using a simple {{ key }} replacement.
     * Supported entities: client, person, client_case, contract, activity
     *
     * @param  array{subject:string, html?:string|null, text?:string|null}  $template
     * @param  array{client?:Client, person?:Person, client_case?:ClientCase, contract?:Contract, activity?:Activity, 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, activity?:Activity, extra?:array}  $ctx
     */
    protected function buildMap(array $ctx): array
    {
        $formatDateEu = static function ($value): string {
            if ($value === null || $value === '') {
                return '';
            }
            try {
                if ($value instanceof \DateTimeInterface) {
                    return Carbon::instance($value)->format('d.m.Y');
                }

                // Accept common formats (Y-m-d, Y-m-d H:i:s, etc.)
                return Carbon::parse((string) $value)->format('d.m.Y');
            } catch (\Throwable $e) {
                return (string) $value;
            }
        };

        $formatMoneyEu = static function ($value): string {
            if ($value === null || $value === '') {
                return '';
            }
            $num = null;
            if (is_numeric($value)) {
                $num = (float) $value;
            } elseif (is_string($value)) {
                // Try to normalize string numbers like "1,234.56" or "1.234,56"
                $normalized = str_replace([' ', '\u{00A0}'], '', $value);
                $normalized = str_replace(['.', ','], ['.', '.'], $normalized);
                $num = is_numeric($normalized) ? (float) $normalized : null;
            }
            if ($num === null) {
                return (string) $value;
            }

            return number_format($num, 2, ',', '.').' €';
        };

        $out = [];
        if (isset($ctx['client'])) {
            $c = $ctx['client'];
            $out['client'] = [
                'id' => data_get($c, 'id'),
                'uuid' => data_get($c, 'uuid'),
                // Expose nested person for {{ client.person.full_name }} etc.
                'person' => [
                    'first_name' => data_get($c, 'person.first_name'),
                    'last_name' => data_get($c, 'person.last_name'),
                    'full_name' => (function ($c) {
                        $fn = (string) data_get($c, 'person.first_name', '');
                        $ln = (string) data_get($c, 'person.last_name', '');
                        $stored = data_get($c, 'person.full_name');

                        return (string) ($stored ?: trim(trim($fn.' '.$ln)));
                    })($c),
                    'email' => data_get($c, 'person.email'),
                    'phone' => data_get($c, 'person.phone'),
                ],
            ];
        }
        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'),
                // Expose nested person for {{ case.person.full_name }}; prefer direct relation, fallback to client.person
                'person' => [
                    'first_name' => data_get($c, 'person.first_name') ?? data_get($c, 'client.person.first_name'),
                    'last_name' => data_get($c, 'person.last_name') ?? data_get($c, 'client.person.last_name'),
                    'full_name' => (function ($c) {
                        $stored = data_get($c, 'person.full_name') ?? data_get($c, 'client.person.full_name');
                        if ($stored) {
                            return (string) $stored;
                        }
                        $fn = (string) (data_get($c, 'person.first_name') ?? data_get($c, 'client.person.first_name') ?? '');
                        $ln = (string) (data_get($c, 'person.last_name') ?? data_get($c, 'client.person.last_name') ?? '');

                        return trim(trim($fn.' '.$ln));
                    })($c),
                    'email' => data_get($c, 'person.email') ?? data_get($c, 'client.person.email'),
                    'phone' => data_get($c, 'person.phone') ?? data_get($c, 'client.person.phone'),
                ],
            ];
        }
        if (isset($ctx['contract'])) {
            $co = $ctx['contract'];
            $out['contract'] = [
                'id' => data_get($co, 'id'),
                'uuid' => data_get($co, 'uuid'),
                'reference' => data_get($co, 'reference'),
                // Format amounts in EU style for emails
                'amount' => $formatMoneyEu(data_get($co, 'amount')),
            ];
            $meta = data_get($co, 'meta');
            if (is_array($meta)) {
                $out['contract']['meta'] = $meta;
            }
        }
        if (isset($ctx['activity'])) {
            $a = $ctx['activity'];
            $out['activity'] = [
                'id' => data_get($a, 'id'),
                'note' => data_get($a, 'note'),
                // EU formatted date and amount by default in emails
                'due_date' => $formatDateEu(data_get($a, 'due_date')),
                'amount' => $formatMoneyEu(data_get($a, 'amount')),
                'action' => [
                    'name' => data_get($a, 'action.name'),
                ],
                'decision' => [
                    'name' => data_get($a, 'decision.name'),
                ],
            ];
        }
        if (! empty($ctx['extra']) && is_array($ctx['extra'])) {
            $out['extra'] = $ctx['extra'];
        }

        return $out;
    }
}