<?php
/*
 * prompts.php
 *
 * User/admin prompt administration page.
 *
 * Normal users:
 *   - manage personal prompts
 *   - copy global default prompts to their own prompts
 *
 * Admin users:
 *   - same as normal users
 *   - manage global default prompts
 */

require_once __DIR__ . '/private/auth.php';
require_once __DIR__ . '/private/header.php';
require_once __DIR__ . '/private/languagestore.php';
require_once __DIR__ . '/private/promptstore.php';
require_once __DIR__ . '/private/usersettings.php';
require_once __DIR__ . '/private/viewdata.php';

require_once __DIR__ . '/config/reporting.php';

$DB_FILE = __DIR__ . '/data/racket-sandbox.sqlite';

$auth = new RacketSandboxAuth($DB_FILE);
$user = $auth->requireLoginHtml();

$store = new PromptStore($DB_FILE);
$languageStore = new LanguageStore($DB_FILE);
$userSettings = new UserSettingsStore($DB_FILE);

$message = '';
$error = '';

function h($s)
{
    return htmlspecialchars((string)$s, ENT_QUOTES | ENT_SUBSTITUTE, 'UTF-8');
}

function t($key, $fallback = null, $values = array())
{
    global $languageStore, $language;

    return $languageStore->translateFormat($key, $language, $values, $fallback);
}

function post_value($name, $default = '')
{
    return $_POST[$name] ?? $default;
}

function get_value($name, $default = '')
{
    return $_GET[$name] ?? $default;
}

function fmt_time($ts)
{
    if ($ts === null) {
        return '-';
    }

    return date('Y-m-d H:i:s', (int)$ts);
}

function prompt_to_array($prompt)
{
    return array(
        'id' => $prompt->id(),
        'name' => $prompt->name(),
        'language' => $prompt->language(),
        'content' => $prompt->content(),
        'default_key' => $prompt->defaultKey(),
        'is_default' => $prompt->isDefault(),
        'created_at' => $prompt->createdAt(),
        'updated_at' => $prompt->updatedAt(),
    );
}

function version_to_array($version)
{
    return array(
        'id' => $version->id(),
        'prompt_id' => $version->promptId(),
        'version_no' => $version->versionNo(),
        'name' => $version->name(),
        'language' => $version->language(),
        'content' => $version->content(),
        'note' => $version->note(),
        'created_at' => $version->createdAt(),
    );
}

function resolve_user_language($userSettings, $userId, $allowedLanguages)
{
    $language = isset($_GET['lang'])
        ? (string)$_GET['lang']
        : (string)$userSettings->get($userId, 'language', 'en');

    if (!in_array($language, $allowedLanguages, true)) {
        $language = 'en';
    }

    $userSettings->set($userId, 'language', $language);

    return $language;
}

$language = resolve_user_language(
    $userSettings,
    $user->id(),
    $store->supportedLanguages()
);

seed_template_translations($languageStore, 'prompts.html');

$mode = get_value('mode', 'personal');

if ($mode !== 'personal' && $mode !== 'defaults') {
    $mode = 'personal';
}

if ($mode === 'defaults' && !$user->isAdmin()) {
    $mode = 'personal';
}

if ($_SERVER['REQUEST_METHOD'] === 'POST') {
    $action = post_value('action');

    try {
        /*
         * User actions.
         */
        if ($action === 'logout') {
            $auth->logout();
            header('Location: /login.php');
            exit;
        } elseif ($action === 'copy_all_defaults') {
            $language = post_value('language', 'en');
            $created = $store->copyAllDefaultsToUser($user->id(), $language);
            $message = 'Default prompts copied to your prompts: ' . $created;
            $mode = 'personal';
        } elseif ($action === 'copy_default') {
            $defaultId = (int)post_value('default_id');
            $store->copyDefaultPromptToUser($user->id(), $defaultId);
            $message = 'Default prompt copied to your prompts.';
            $mode = 'personal';
        } elseif ($action === 'create_prompt') {
            $language = post_value('language', 'en');

            $store->createPrompt(
                $user->id(),
                post_value('name'),
                $language,
                post_value('content')
            );

            $message = 'Prompt created.';
            $mode = 'personal';
        } elseif ($action === 'update_prompt') {
            $promptId = (int)post_value('prompt_id');
            $language = post_value('language', 'en');

            $store->updatePrompt(
                $user->id(),
                $promptId,
                post_value('name'),
                $language,
                post_value('content'),
                isset($_POST['create_version']),
                post_value('version_note')
            );

            $message = 'Prompt updated.';
            $mode = 'personal';
        } elseif ($action === 'create_version') {
            $promptId = (int)post_value('prompt_id');
            $store->createVersion($user->id(), $promptId, post_value('version_note'));
            $message = 'Version stored.';
            $mode = 'personal';
        } elseif ($action === 'restore_version') {
            $promptId = (int)post_value('prompt_id');
            $versionNo = (int)post_value('version_no');
            $store->restoreVersion($user->id(), $promptId, $versionNo);
            $message = 'Version restored.';
            $mode = 'personal';
        } elseif ($action === 'delete_version') {
            $promptId = (int)post_value('prompt_id');
            $versionNo = (int)post_value('version_no');
            $store->deleteVersion($user->id(), $promptId, $versionNo);
            $message = 'Version deleted.';
            $mode = 'personal';
        } elseif ($action === 'delete_prompt') {
            $promptId = (int)post_value('prompt_id');
            $store->deletePrompt($user->id(), $promptId);
            $message = 'Prompt deleted.';
            $mode = 'personal';
        }

        /*
         * Admin-only default prompt actions.
         */
        elseif ($action === 'create_default' ||
                $action === 'update_default' ||
                $action === 'create_default_version' ||
                $action === 'restore_default_version' ||
                $action === 'delete_default_version' ||
                $action === 'delete_default') {

            if (!$user->isAdmin()) {
                throw new Exception('Admin rights required.');
            }

            $mode = 'defaults';

            if ($action === 'create_default') {
                $language = post_value('language', 'en');

                $store->createDefaultPrompt(
                    post_value('default_key'),
                    post_value('name'),
                    $language,
                    post_value('content')
                );

                $message = 'Default prompt created.';
            } elseif ($action === 'update_default') {
                $defaultId = (int)post_value('default_id');
                $language = post_value('language', 'en');

                $store->updateDefaultPrompt(
                    $defaultId,
                    post_value('default_key'),
                    post_value('name'),
                    $language,
                    post_value('content'),
                    isset($_POST['create_version']),
                    post_value('version_note')
                );

                $message = 'Default prompt updated.';
            } elseif ($action === 'create_default_version') {
                $defaultId = (int)post_value('default_id');
                $store->createDefaultVersion($defaultId, post_value('version_note'));
                $message = 'Default prompt version stored.';
            } elseif ($action === 'restore_default_version') {
                $defaultId = (int)post_value('default_id');
                $versionNo = (int)post_value('version_no');
                $store->restoreDefaultVersion($defaultId, $versionNo);
                $message = 'Default prompt version restored.';
            } elseif ($action === 'delete_default_version') {
                $defaultId = (int)post_value('default_id');
                $versionNo = (int)post_value('version_no');
                $store->deleteDefaultVersion($defaultId, $versionNo);
                $message = 'Default prompt version deleted.';
            } elseif ($action === 'delete_default') {
                $defaultId = (int)post_value('default_id');
                $store->deleteDefaultPrompt($defaultId);
                $message = 'Default prompt deleted.';
            }
        } elseif ($action !== '') {
            throw new Exception(t('prompts.unknown_action', 'Unknown action: {{action}}', array('action' => $action)));
        }
    } catch (Throwable $e) {
        $error = $e->getMessage();
    }
}

$personalPrompts = $store->listPrompts($user->id(), $language);
$defaultPrompts = $store->listDefaultPrompts($language);

/*
 * Full prompt data for the modal editor.
 */
$allPersonalPrompts = $store->listPrompts($user->id(), null);
$allDefaultPrompts = $store->listDefaultPrompts(null);

$promptData = array(
    'personal' => array(),
    'default' => array(),
    'can_edit_defaults' => $user->isAdmin(),
);

foreach ($allPersonalPrompts as $p) {
    $promptData['personal'][$p->id()] = prompt_to_array($p);
    $promptData['personal'][$p->id()]['versions'] = array();

    foreach ($store->listVersions($user->id(), $p->id()) as $v) {
        $promptData['personal'][$p->id()]['versions'][] = version_to_array($v);
    }
}

foreach ($allDefaultPrompts as $p) {
    $promptData['default'][$p->id()] = prompt_to_array($p);
    $promptData['default'][$p->id()]['versions'] = array();

    if ($user->isAdmin()) {
        foreach ($store->listDefaultVersions($p->id()) as $v) {
            $promptData['default'][$p->id()]['versions'][] = version_to_array($v);
        }
    }
}

$headerLanguages = array();

foreach ($store->supportedLanguages() as $lang) {
    $headerLanguages[$lang] = $store->languageLabel($lang);
}

$headerNavItems = array(
    array(
        'label' => t('prompts.back', 'Back to Racket sandbox'),
        'url' => '/',
    ),
);

if ($user->isAdmin()) {
    $headerNavItems[] = array(
        'label' => t('app.user_management', 'User management'),
        'url' => '/users?lang=' . rawurlencode($language),
        'separator_before' => true,
    );
    $headerNavItems[] = array(
        'label' => t('app.configuration', 'Configuration'),
        'url' => '/admin-config?lang=' . rawurlencode($language),
        'separator_before' => true,
    );
}

$styleVersion = @filemtime(__DIR__ . '/css/styles.css') ?: time();
$promptEditorVersion = @filemtime(__DIR__ . '/js/prompt-editor.js') ?: time();

header('Content-Type: text/html; charset=utf-8');

$languageOptionsHtml = '';
$languageOptionsPlainHtml = '';

foreach ($store->supportedLanguages() as $lang) {
    $languageOptionsHtml .= RacketSandboxTemplate::renderFile('partials/select-option.html', array(
        'value' => $lang,
        'selected' => $lang === $language ? ' selected' : '',
        'label' => $store->languageLabel($lang),
    )) . "\n";

    $languageOptionsPlainHtml .= RacketSandboxTemplate::renderFile('partials/select-option.html', array(
        'value' => $lang,
        'selected' => '',
        'label' => $store->languageLabel($lang),
    )) . "\n";
}

$defaultAdminNoticeHtml = '';

if ($user->isAdmin()) {
    $defaultAdminNoticeHtml = RacketSandboxTemplate::renderFile('partials/prompt-admin-notice.html', array(
        'badge' => t('prompts.default_admin_badge', 'Admin default prompts'),
        'hint' => t('prompts.default_admin_hint', 'You are editing global default prompts. Users can copy these to their own prompts.'),
    ));
}

$defaultPromptsHtml = '';

foreach ($defaultPrompts as $default) {
    $adminDeleteHtml = '';

    if ($user->isAdmin()) {
        $adminDeleteHtml = RacketSandboxTemplate::renderFile('partials/prompt-default-delete.html', array(
            'language_url' => rawurlencode($language),
            'confirm_json' => json_encode(t('prompts.delete_default_confirm', 'Delete default prompt {{name}}?', array(
                'name' => $default->name(),
            )), JSON_HEX_TAG | JSON_HEX_AMP | JSON_HEX_APOS | JSON_HEX_QUOT),
            'name' => $default->name(),
            'id' => $default->id(),
            'delete_label' => t('prompts.delete', 'delete'),
        ));
    }

    $defaultPromptsHtml .= RacketSandboxTemplate::renderFile('partials/prompt-default-item.html', array(
        'language_url' => rawurlencode($language),
        'id' => $default->id(),
        'name' => $default->name(),
        'default_key' => $default->defaultKey(),
        'metadata' => t('prompts.default_metadata', '{{default_key}} · {{updated_at}}', array(
            'default_key' => '<code>' . h($default->defaultKey()) . '</code>',
            'updated_at' => fmt_time($default->updatedAt()),
        )),
        'copy_label' => t('prompts.copy', 'copy'),
        'admin_delete_html' => $adminDeleteHtml,
    )) . "\n";
}

$noDefaultsHtml = count($defaultPrompts) === 0
    ? RacketSandboxTemplate::renderFile('partials/paragraph.html', array(
        'class' => 'empty-state',
        'text' => t('prompts.no_defaults', 'No default prompts for this language yet.'),
    ))
    : '';

$createDefaultHtml = '';

if ($user->isAdmin()) {
    $createDefaultHtml = RacketSandboxTemplate::renderFile('partials/prompt-create-default.html', array(
        'language_url' => rawurlencode($language),
        'create_default_label' => t('prompts.create_default', 'Create default prompt'),
        'default_key_label' => t('prompts.default_key', 'Default key'),
        'name_label' => t('prompts.name', 'Name'),
        'language_label' => t('prompts.language', 'Language'),
        'language_options_html' => $languageOptionsHtml,
        'prompt_content_label' => t('prompts.prompt_content', 'Prompt content'),
    ));
}

$personalPromptsHtml = '';

foreach ($personalPrompts as $prompt) {
    $personalPromptsHtml .= RacketSandboxTemplate::renderFile('partials/prompt-personal-item.html', array(
        'language_url' => rawurlencode($language),
        'id' => $prompt->id(),
        'name' => $prompt->name(),
        'metadata' => t('prompts.personal_metadata', '{{language}} · {{updated_at}}', array(
            'language' => $store->languageLabel($prompt->language()),
            'updated_at' => fmt_time($prompt->updatedAt()),
        )),
        'confirm_json' => json_encode(t('prompts.delete_prompt_confirm', 'Delete prompt {{name}}?', array(
            'name' => $prompt->name(),
        )), JSON_HEX_TAG | JSON_HEX_AMP | JSON_HEX_APOS | JSON_HEX_QUOT),
        'delete_label' => t('prompts.delete', 'delete'),
    )) . "\n";
}

$noPersonalHtml = count($personalPrompts) === 0
    ? RacketSandboxTemplate::renderFile('partials/paragraph.html', array(
        'class' => 'empty-state',
        'text' => t('prompts.no_personal', 'No personal prompts yet for this language.'),
    ))
    : '';

$promptTextJson = json_encode(array(
    'prompt_not_found' => t('prompts.prompt_not_found', 'Prompt not found'),
    'no_previous_versions' => t('prompts.no_previous_versions', 'No previous versions stored.'),
    'no_lines_for_view' => t('prompts.no_lines_for_view', 'No lines for this view.'),
    'restore_version_confirm' => t('prompts.restore_version_confirm', 'Restore version'),
    'delete_version_confirm' => t('prompts.delete_version_confirm', 'Delete version'),
    'default_prompt_prefix' => t('prompts.default_prompt_prefix', 'Default prompt: '),
    'prompt_prefix' => t('prompts.prompt_prefix', 'Prompt: '),
    'created' => t('prompts.created', 'created'),
    'updated' => t('prompts.updated', 'updated'),
    'default_prompt' => t('prompts.default_prompt', 'default prompt'),
    'version' => t('prompts.version', 'version'),
    'showing_version' => t('prompts.showing_version', 'showing version'),
    'of' => t('prompts.of', 'of'),
    'old' => t('prompts.old', 'old'),
    'new' => t('prompts.new', 'new'),
), JSON_UNESCAPED_SLASHES | JSON_UNESCAPED_UNICODE);

$headerHtml = app_header_html(array(
    'title' => t('prompts.title', 'Prompt administration'),
    'nav_items' => $headerNavItems,
    'user' => $user,
    'admin_label' => t('app.admin', 'admin'),
    'language_label' => t('prompts.language', 'Language'),
    'language' => $language,
    'languages' => $headerLanguages,
    'language_action' => '/prompts',
    'language_hidden' => array('mode' => $mode),
    'logout_action' => '/prompts?lang=' . rawurlencode($language) . '&mode=' . rawurlencode($mode),
    'logout_label' => t('app.logout', 'Logout'),
    'message' => $message,
    'error' => $error,
));

echo RacketSandboxTemplate::renderFile('prompts.html', array(
    'language' => $language,
    'language_url' => rawurlencode($language),
    'mode_url' => rawurlencode($mode),
    'title' => t('prompts.title', 'Prompt administration'),
    'style_version' => $styleVersion,
    'prompt_editor_version' => $promptEditorVersion,
    'header_html' => $headerHtml,
    'defaults_tab_active_class' => $mode === 'defaults' ? 'active' : '',
    'defaults_tab_selected' => $mode === 'defaults' ? 'true' : 'false',
    'personal_tab_active_class' => $mode !== 'defaults' ? 'active' : '',
    'personal_tab_selected' => $mode !== 'defaults' ? 'true' : 'false',
    'available_defaults_label' => t('prompts.available_defaults', 'Available default prompts'),
    'your_prompts_label' => t('prompts.your_prompts', 'Your prompts'),
    'default_admin_notice_html' => $defaultAdminNoticeHtml,
    'copy_all_label' => t('prompts.copy_all', 'Copy all'),
    'default_prompts_html' => $defaultPromptsHtml,
    'no_defaults_html' => $noDefaultsHtml,
    'create_default_html' => $createDefaultHtml,
    'personal_prompts_html' => $personalPromptsHtml,
    'no_personal_html' => $noPersonalHtml,
    'create_personal_label' => t('prompts.create_personal', 'Create personal prompt'),
    'name_label' => t('prompts.name', 'Name'),
    'language_label' => t('prompts.language', 'Language'),
    'language_options_html' => $languageOptionsHtml,
    'language_options_plain_html' => $languageOptionsPlainHtml,
    'prompt_content_label' => t('prompts.prompt_content', 'Prompt content'),
    'select_prompt_label' => t('prompts.select_prompt', 'Select a prompt on the left to view it.'),
    'prompt_label' => t('prompts.prompt', 'Prompt'),
    'edit_label' => t('prompts.edit', 'Edit'),
    'back_label' => t('prompts.back', 'Back to Racket sandbox'),
    'close_label' => t('prompts.close', 'Close'),
    'newer_previous_label' => t('prompts.newer_previous', 'newer previous version'),
    'older_previous_label' => t('prompts.older_previous', 'older previous version'),
    'diff_view_label' => t('prompts.diff_view', 'Diff view:'),
    'diff_plain_label' => t('prompts.diff_plain', 'text, no diff'),
    'diff_all_label' => t('prompts.diff_all', 'all diff'),
    'diff_same_label' => t('prompts.diff_same', 'unchanged only'),
    'diff_added_label' => t('prompts.diff_added', 'additions only'),
    'diff_deleted_label' => t('prompts.diff_deleted', 'deletions only'),
    'diff_changed_label' => t('prompts.diff_changed', 'changes only'),
    'default_key_label' => t('prompts.default_key', 'Default key'),
    'previous_version_label' => t('prompts.previous_version', 'Previous version'),
    'store_version_label' => t('prompts.store_version', 'store this edit as a new version'),
    'version_note_label' => t('prompts.version_note', 'Version note:'),
    'save_label' => t('prompts.save', 'Save'),
    'store_snapshot_label' => t('prompts.store_snapshot', 'Store snapshot'),
    'restore_version_label' => t('prompts.restore_version', 'Restore selected version'),
    'delete_version_label' => t('prompts.delete_version', 'Delete selected version'),
    'prompt_data_json' => json_encode($promptData, JSON_UNESCAPED_SLASHES | JSON_UNESCAPED_UNICODE),
    'prompt_text_json' => $promptTextJson,
));