<?php
declare(strict_types=1);

require_once dirname(dirname(__DIR__)) . '/bootstrap.php';

function task_cert_admin_task_form_action(): array
{
    $auth = TaskCertAuthContext::fromGlobals();
    if (!$auth->hasPermission('r-task-cert-admin')) {
        return [
            'error' => 'Keine Berechtigung für die Aufgaben-Administration.',
        ];
    }

    $taskId = TaskCertRequest::queryInt('id', 0);
    $services = task_cert_services();

    $task = null;
    $rules = [
        'methods' => [],
        'target_rules' => [],
        'target_overrides' => [],
        'reminder_policy' => [
            'base_mode' => 'due_date',
            'first_escalation_days' => 0,
            'step_days' => 7,
            'max_level' => 3,
            'active' => 1,
        ],
    ];

    if ($taskId > 0) {
        $task = $services['taskDefinitionService']->getTaskDetail($taskId);
        if ($task === null) {
            return [
                'error' => 'Aufgabe nicht gefunden.',
            ];
        }

        $rules = $task['rules'] ?? $rules;
    }

    $methodConfig = task_cert_normalize_method_config($rules['methods'] ?? []);
    $targetSelection = task_cert_normalize_target_selection($rules['target_rules'] ?? [], $rules['target_overrides'] ?? []);
    $targetSelection['responsible_contact_ids'] = is_array($rules['responsible_contact_ids'] ?? null)
        ? array_values(array_unique(array_map('intval', $rules['responsible_contact_ids'])))
        : [];

    $languageId = (int) ($GLOBALS['language']['id'] ?? 1);
    $lookupService = $services['lookupService'] ?? null;
    $lookup = ($lookupService instanceof TaskLookupService)
        ? $lookupService->getAdminFormLookups($languageId)
        : [
            'task_categories' => [],
            'mandants' => [],
            'departments' => [],
            'roles' => [],
            'contacts' => [],
            'knowledge_posts' => [],
        ];

    $taskCategoryId = (int) (($task['task_category_id'] ?? 0));
    if ($taskCategoryId > 0) {
        $taskCategories = is_array($lookup['task_categories'] ?? null) ? $lookup['task_categories'] : [];
        $hasSelectedCategory = false;
        foreach ($taskCategories as $category) {
            if ((int) ($category['id'] ?? 0) === $taskCategoryId) {
                $hasSelectedCategory = true;
                break;
            }
        }

        if (!$hasSelectedCategory) {
            $taskCategories[] = [
                'id' => $taskCategoryId,
                'name' => 'Kategorie #' . $taskCategoryId . ' (nicht gefunden)',
                'slug' => '',
                'sort_order' => 999999,
                'active' => 0,
            ];
        }

        $lookup['task_categories'] = $taskCategories;
    }

    return [
        'error' => null,
        'task' => $task,
        'rules' => $rules,
        'method_config' => $methodConfig,
        'target_selection' => $targetSelection,
        'lookup' => $lookup,
        'csrf_token' => TaskCertCsrf::token(),
    ];
}

function task_cert_normalize_method_config(array $methods): array
{
    $types = TaskCertConstants::METHOD_TYPES;
    $enabled = array_fill_keys($types, 0);

    $config = [
        'enabled' => $enabled,
        'knowledge_post_ids' => [],
        'form_fields' => [],
        'quiz_questions' => [],
    ];

    foreach ($methods as $method) {
        $type = (string) ($method['method_type'] ?? '');
        if (!array_key_exists($type, $config['enabled'])) {
            continue;
        }

        $config['enabled'][$type] = ((int) ($method['active'] ?? 1) === 1) ? 1 : 0;

        if ($type === 'knowledge_read') {
            foreach (($method['knowledge_posts'] ?? []) as $post) {
                $postId = (int) ($post['knowledge_post_id'] ?? 0);
                if ($postId > 0) {
                    $config['knowledge_post_ids'][] = $postId;
                }
            }
        }

        if ($type === 'form_submit') {
            $fields = is_array($method['form_fields'] ?? null) ? $method['form_fields'] : [];
            foreach ($fields as $field) {
                $options = [];
                foreach ((array) ($field['options'] ?? []) as $option) {
                    if (is_array($option)) {
                        $value = trim((string) ($option['value'] ?? $option['label'] ?? ''));
                        if ($value !== '') {
                            $options[] = $value;
                        }
                    } else {
                        $value = trim((string) $option);
                        if ($value !== '') {
                            $options[] = $value;
                        }
                    }
                }

                $config['form_fields'][] = [
                    'field_key' => (string) ($field['field_key'] ?? ''),
                    'label' => (string) ($field['label'] ?? ''),
                    'field_type' => (string) ($field['field_type'] ?? 'text'),
                    'is_required' => (int) ($field['is_required'] ?? 0),
                    'placeholder' => (string) ($field['placeholder'] ?? ''),
                    'prefill_column' => (string) ($field['prefill_column'] ?? ''),
                    'options_text' => implode(', ', $options),
                ];
            }
        }

        if ($type === 'quiz') {
            foreach ((array) ($method['quiz_questions'] ?? []) as $question) {
                $normalizedQuestion = [
                    'question_text' => (string) ($question['question_text'] ?? ''),
                    'option_a' => '',
                    'option_b' => '',
                    'option_c' => '',
                    'option_d' => '',
                    'correct_option' => 'a',
                ];

                $options = array_values((array) ($question['options'] ?? []));
                $letters = ['a', 'b', 'c', 'd'];

                foreach ($letters as $index => $letter) {
                    if (!isset($options[$index])) {
                        continue;
                    }

                    $option = $options[$index];
                    $normalizedQuestion['option_' . $letter] = (string) ($option['option_text'] ?? '');

                    if ((int) ($option['is_correct'] ?? 0) === 1) {
                        $normalizedQuestion['correct_option'] = $letter;
                    }
                }

                $config['quiz_questions'][] = $normalizedQuestion;
            }
        }
    }

    $config['knowledge_post_ids'] = array_values(array_unique(array_map('intval', $config['knowledge_post_ids'])));

    return $config;
}

function task_cert_normalize_target_selection(array $targetRules, array $targetOverrides): array
{
    $selection = [
        'mandant_ids' => [],
        'department_ids' => [],
        'role_ids' => [],
        'einricht_ids' => [],
        'fachbereich_ids' => [],
        'override_include_contact_ids' => [],
        'override_exclude_contact_ids' => [],
        'override_include_reason' => '',
        'override_exclude_reason' => '',
    ];

    foreach ($targetRules as $rule) {
        $mandantId = (int) ($rule['main_mandant_id'] ?? 0);
        $departmentId = (int) ($rule['main_department_id'] ?? 0);
        $roleId = (int) ($rule['main_role_id'] ?? 0);
        $einrichtId = (int) ($rule['main_einricht_id'] ?? 0);
        $fachbereichId = (int) ($rule['main_bereich_id'] ?? 0);

        if ($mandantId > 0) {
            $selection['mandant_ids'][] = $mandantId;
        }

        if ($departmentId > 0) {
            $selection['department_ids'][] = $departmentId;
        }

        if ($roleId > 0) {
            $selection['role_ids'][] = $roleId;
        }

        if ($einrichtId > 0) {
            $selection['einricht_ids'][] = $einrichtId;
        }

        if ($fachbereichId > 0) {
            $selection['fachbereich_ids'][] = $fachbereichId;
        }
    }

    foreach ($targetOverrides as $override) {
        $contactId = (int) ($override['main_contact_id'] ?? 0);
        if ($contactId <= 0) {
            continue;
        }

        $type = (string) ($override['override_type'] ?? '');
        if ($type === 'include') {
            $selection['override_include_contact_ids'][] = $contactId;
            if ($selection['override_include_reason'] === '') {
                $selection['override_include_reason'] = (string) ($override['reason'] ?? '');
            }
        }

        if ($type === 'exclude') {
            $selection['override_exclude_contact_ids'][] = $contactId;
            if ($selection['override_exclude_reason'] === '') {
                $selection['override_exclude_reason'] = (string) ($override['reason'] ?? '');
            }
        }
    }

    $arrayKeys = [
        'mandant_ids',
        'department_ids',
        'role_ids',
        'einricht_ids',
        'fachbereich_ids',
        'override_include_contact_ids',
        'override_exclude_contact_ids',
    ];

    foreach ($arrayKeys as $key) {
        $values = is_array($selection[$key] ?? null) ? $selection[$key] : [];
        $selection[$key] = array_values(array_unique(array_map('intval', $values)));
    }

    return $selection;
}