<?php

namespace Modules\Api\Http\Requests;

use App\Http\Requests\Request;
use Illuminate\Contracts\Validation\Validator;
use Illuminate\Http\Exceptions\HttpResponseException;
use Modules\Tickets\Service\TicketFieldSettingsService;

class UpdateTicketApiRequest extends Request
{
    public function authorize(): bool
    {
        return true;
    }

    public function rules(): array
    {
        $user = auth()->user();
        if (!$user) {
            return [];
        }

        $svc = app(TicketFieldSettingsService::class);

        // Built-in field rules — wrap any 'required' with 'sometimes' for partial updates
        $rules = [];
        $baseRules = $svc->getValidationRules($user);
        unset($baseRules['custom_data']);
        foreach ($baseRules as $key => $rule) {
            $ruleArr = is_string($rule) ? explode('|', $rule) : (array) $rule;
            if (($idx = array_search('required', $ruleArr)) !== false) {
                array_splice($ruleArr, $idx, 1);
                array_unshift($ruleArr, 'sometimes');
            }
            $rules[$key] = $ruleArr;
        }

        // Flat rules for visible custom fields (all optional on update)
        foreach ($svc->getEffectiveFields($user) as $field) {
            if (!($field['is_custom'] ?? false) || !($field['visible'] ?? false)) {
                continue;
            }
            $rule = ['sometimes', 'nullable'];
            $type = $field['type'] ?? 'text';
            if ($type === 'number')       { $rule[] = 'numeric'; }
            elseif ($type === 'email')    { $rule[] = 'email'; }
            elseif ($type === 'date')     { $rule[] = 'date'; }
            elseif ($type === 'datetime') { $rule[] = 'date'; }
            elseif (is_int($field['max_length'] ?? null)) {
                $rule[] = 'string';
                $rule[] = 'max:' . $field['max_length'];
            }
            $rules[$field['key']] = $rule;
        }

        // Relation constraints
        $relations = [
            'ticket_status_id'   => 'tickets_dict_status',
            'ticket_priority_id' => 'tickets_dict_priority',
            'ticket_severity_id' => 'tickets_dict_severity',
            'ticket_category_id' => 'tickets_dict_category',
            'contact_id'         => 'contacts',
            'account_id'         => 'accounts',
            'lead_id'            => 'leads',
            'parent_id'          => 'tickets',
            'ticket_owner_id'    => 'users',
        ];
        foreach ($relations as $field => $table) {
            $rules[$field] = ['sometimes', 'nullable', 'integer', "exists:{$table},id"];
        }

        return $rules;
    }

    protected function failedValidation(Validator $validator): void
    {
        throw new HttpResponseException(response()->json([
            'status'  => false,
            'errors'  => $validator->errors(),
            'message' => 'Validation failed',
        ], 422));
    }
}