<?php

/**
 * FormBootstrap — shared bootstrap logic for TFE form pages.
 *
 * Provides factory methods and helper closures used by add, edit, and partage
 * form scripts, eliminating copy-pasted preamble across the three entry points.
 *
 * Each public static method returns an associative array of variables to be
 * extracted in the caller's scope.
 */
class FormBootstrap
{
    // ── Asset arrays (identical for all admin form pages) ────────────────────

    public static function adminAssetArrays(): array
    {
        return [
            'extraCss'      => ['/assets/dist/form.min.css'],
            'extraCssAdmin' => [],
            'extraJs'        => [
                '/assets/js/vendor/filepond.min.js',
                '/assets/js/vendor/filepond-plugin-file-validate-type.min.js',
                '/assets/js/vendor/filepond-plugin-file-validate-size.min.js',
                '/assets/js/vendor/filepond-plugin-image-preview.min.js',
                '/assets/js/vendor/filepond-plugin-image-exif-orientation.min.js',
                '/assets/dist/form.min.js',
            ],
        ];
    }

    // ── Helpers ───────────────────────────────────────────────────────────────

    /**
     * Build an `old()` callable for admin forms (add/edit).
     *
     * Returns `htmlspecialchars`-escaped string values, or the raw array for
     * array-typed keys. Uses the $formData array from the caller's scope
     * (which may be $_SESSION['form_data'] with an edit-data overlay).
     */
    public static function adminOld(array &$formData): callable
    {
        return function (string $key, string $default = '') use (&$formData): string|array {
            if (!isset($formData[$key])) {
                return $default;
            }
            if (is_array($formData[$key])) {
                return $formData[$key];
            }
            return htmlspecialchars((string)$formData[$key]);
        };
    }

    /**
     * Build an `old()` callable for share/partage forms.
     *
     * Returns raw values (no escaping) — callers must apply htmlspecialchars()
     * when rendering. Supports colon-delimited keys (e.g. "key:0").
     */
    public static function shareOld(array &$formData): callable
    {
        return function (string $key, string $default = '') use (&$formData) {
            $parts = explode(':', $key);
            $value = $formData;
            foreach ($parts as $part) {
                if (is_array($value) && array_key_exists($part, $value)) {
                    $value = $value[$part];
                } else {
                    return $default;
                }
            }
            return $value;
        };
    }

    // ── Common form variables ─────────────────────────────────────────────────

    /**
     * Return the standard variable set needed by form partials for an admin
     * add/edit page. Returns an array suitable for extract().
     *
     * @param string $mode              'add' | 'edit'
     * @param string $formAction        URL string
     * @param string $hiddenFields      Raw HTML for hidden inputs
     * @param array  $formData          Merged form data for repopulation
     * @param array  $siteSettings      from getAllSettings()
     * @param array  $helpBlocks        from getAllFormHelpBlocks()
     * @param array  $options           Overrides for individual keys (juryPromoteur, etc.)
     */
    public static function adminFormVariables(
        string $mode,
        string $formAction,
        string $hiddenFields,
        array  &$formData,
        array  $siteSettings,
        array  $helpBlocks,
        array  $options = []
    ): array {
        $helpFn = function (string $key) use ($helpBlocks): string {
            return empty($helpBlocks[$key]['enabled']) ? '' : ($helpBlocks[$key]['content'] ?? '');
        };

        $autofocusField = App::consumeAutofocus();

        // Controls
        $showContact    = false;
        $showBackoffice = ($mode === 'add' || $mode === 'edit');

        // Licence / access toggles: admin always enables all three
        $libreEnabled        = true;
        $interneEnabled      = true;
        $interditEnabled     = true;
        $generalitiesHtml    = $helpFn('fieldset_generalites');
        $defaultAccessTypeId = $options['defaultAccessTypeId'] ?? 2;

        // ── Autosave draft wiring (add / edit only) ─────────────────────┐
        $autosaveUrl = '/admin/actions/draft.php';
        $formExtraAttrs = '';
        $showAutosaveStatus = false;
        $extraHidden = '';
        if ($mode === 'add') {
            // Reuse draft token from session so drafts survive page reloads
            if (empty($_SESSION['admin_draft_add_token'])) {
                $_SESSION['admin_draft_add_token'] = bin2hex(random_bytes(8));
            }
            $draftToken = $_SESSION['admin_draft_add_token'];
            $draftKey = 'admin_draft_' . $draftToken;
            $extraHidden = '<input type="hidden" name="draft_token" value="' . $draftToken . '">';
            // Hydrate from any previous session (survives accidental navigations)
            $draft = $_SESSION[$draftKey] ?? [];
            $formData = array_merge($draft, $formData);
            $showAutosaveStatus = true;
        } elseif ($mode === 'edit') {
            $thesisId = (int)($options['thesisId'] ?? 0);
            if ($thesisId > 0) {
                $draftKey = 'admin_draft_edit_' . $thesisId;
                $extraHidden = '<input type="hidden" name="thesis_id" value="' . $thesisId . '">';
                $draft = $_SESSION[$draftKey] ?? [];
                $formData = array_merge($draft, $formData);
                $showAutosaveStatus = true;
            }
        }
        // NOTE: Do NOT set hx-post on the <form> element.
        // It would intercept the native form submit and POST to draft.php
        // instead of the actual form action (formulaire.php / edit.php).
        // Autosave is handled by the hidden probe <div> with its own hx-post.
        $formExtraAttrs = ''; // intentionally always empty

        return array_merge([
            // Base
            'mode'             => $mode,
            'formAction'       => $formAction,
            'hiddenFields'     => $hiddenFields . $extraHidden,
            'errorFieldName'   => $autofocusField,
            'synopsisExtra'    => $options['synopsisExtra'] ?? '',
            'formExtraAttrs'   => $formExtraAttrs,
            'showAutosaveStatus' => $showAutosaveStatus,
            'autosaveUrl'      => $autosaveUrl,

            // Helpers
            'helpFn'           => $helpFn,
            'helpBlocks'       => $helpBlocks,
            'oldFn'            => self::adminOld($formData),
            'withAutofocusFn'  => function (string $field, array $attrs = []) use ($autofocusField): array {
                if ($autofocusField === $field) {
                    $attrs['autofocus'] = true;
                }
                return $attrs;
            },

            // Jury
            'juryPromoteur'         => null,
            'juryPromoteurs'        => [],
            'juryPromoteurUlb'       => null,
            'juryPromoteursUlb'      => [],
            'lecteursInternes'       => [],
            'lecteursExternes'       => [],
            'showPromoteurUlb'       => true,
            'promoteurUlbConditional' => false,

            // Licence / access
            'libreEnabled'           => $libreEnabled,
            'interneEnabled'         => $interneEnabled,
            'interditEnabled'        => $interditEnabled,
            'generalitiesHtml'       => $generalitiesHtml,
            'defaultAccessTypeId'    => $defaultAccessTypeId,

            // Optional sections
            'showContact'            => $showContact,
            'showBackoffice'         => $showBackoffice,
            'showCoverPreview'       => false,
            'showExistingFiles'      => false,
            'showEmailConfirmation'  => false,
            'showFlash'              => false,
            'showIntroHelp'          => false,

            // Files
            'filesMode'              => $options['filesMode'] ?? 'add',

            // Website
            'existingWebsiteUrl'     => $options['existingWebsiteUrl'] ?? '',
            'existingWebsiteLabel'   => $options['existingWebsiteLabel'] ?? '',
            'checkedFormatsForSiteWeb' => $options['checkedFormats'] ?? [],

            // Backoffice (empty for add, populated for edit by caller)
            'currentRaw'             => [],
            'contactInterne'          => null,
            'contactPublic'           => null,
            'currentContextNote'      => null,
            'currentContactVisible'   => null,


            // Files (edit mode)
            'currentCover'           => null,
            'currentFiles'           => [],
        ], $options);
    }
}