<?php

namespace Kanboard\Plugin\OrganonTweaks\Helper;

use Kanboard\Core\Base;
use Kanboard\Model\CustomFilterModel;

/**
 * Per-board helper for OrganonTweaks.
 *
 * Resolves the 3-state "emphasize due date" setting for the CURRENT board (read from the route
 * project_id, which the router populates for pretty URLs before the layout renders):
 *   per-board 'on' -> on, 'off' -> off, 'default'/absent -> follow the LIVE global default.
 *
 * The stored values are the non-falsy strings 'on'/'off' (not '1'/'0'): Kanboard's
 * MetadataModel::get() uses `?:`, and PHP treats the string "0" as falsy, so a stored "0" would
 * come back as the 'default' fallback and "Always off" would never be honored.
 *
 * Also maintains a shared "Show all tasks" custom filter (an empty query) on every board, so there
 * is always a one-click way to clear the board filter and reveal open + closed tasks.
 */
class OrganonProjectHelper extends Base
{
    const EMPHASIZE_KEY = 'organon_tweaks_emphasize_duedate';
    const EMPHASIZE_DEFAULT_KEY = 'organon_tweaks_emphasize_duedate_default';

    const SHOW_ALL_FILTER_KEY = 'organon_tweaks_show_all_filter';

    // The plugin RESERVES this custom-filter name: a fixed (non-translated) string so the dedup is
    // stable across locales. A user's own filter with this name is absorbed into the canonical form.
    const SHOW_ALL_FILTER_NAME = 'Show all tasks';

    /**
     * Should the current board emphasize the due date? Board pages only (project_id in the route).
     *
     * @return bool
     */
    public function isEmphasizeDueDate()
    {
        $project_id = $this->request->getIntegerParam('project_id');

        if ($project_id <= 0) {
            return false;
        }

        $value = $this->projectMetadataModel->get($project_id, self::EMPHASIZE_KEY, 'default');

        if ($value === 'on') {
            return true;
        }

        if ($value === 'off') {
            return false;
        }

        // 'default' (or absent) -> follow the live global default.
        return (int) $this->configModel->get(self::EMPHASIZE_DEFAULT_KEY, 0) === 1;
    }

    /**
     * Ensure the board has exactly one canonical "Show all tasks" filter (empty query, shared).
     * Idempotent: create it when absent, force a same-named one back to the canonical form (reserved
     * name), and drop any duplicates. Called lazily on every project-header render, so it covers old
     * and new boards alike. No-op without a real project and a real owner (custom_filters.user_id has
     * a FK to users, so a system id like 0 would fail the insert).
     *
     * @param int $project_id
     */
    public function ensureShowAllFilter($project_id)
    {
        $project_id = (int) $project_id;
        $user_id = (int) $this->userSession->getId();

        if ($project_id <= 0 || $user_id <= 0) {
            return;
        }

        $existing = $this->db->table(CustomFilterModel::TABLE)
            ->eq('project_id', $project_id)
            ->eq('name', self::SHOW_ALL_FILTER_NAME)
            ->findAll();

        if (empty($existing)) {
            $this->db->table(CustomFilterModel::TABLE)->insert(array(
                'filter' => '',
                'project_id' => $project_id,
                'user_id' => $user_id,
                'name' => self::SHOW_ALL_FILTER_NAME,
                'is_shared' => 1,
                'append' => 0,
            ));
            return;
        }

        // Reserved name: keep one, force it to the canonical empty + shared form, drop the rest.
        $keep = array_shift($existing);

        if ($keep['filter'] !== '' || (int) $keep['is_shared'] !== 1) {
            $this->db->table(CustomFilterModel::TABLE)
                ->eq('id', $keep['id'])
                ->update(array('filter' => '', 'is_shared' => 1));
        }

        foreach ($existing as $duplicate) {
            $this->db->table(CustomFilterModel::TABLE)->eq('id', $duplicate['id'])->remove();
        }
    }

    /**
     * Toggle turned ON: eagerly (re)create the "Show all tasks" filter on every existing board.
     * ensureShowAllFilter() keeps covering boards created afterwards.
     */
    public function addShowAllFilterToAllProjects()
    {
        foreach ($this->projectModel->getAll() as $project) {
            $this->ensureShowAllFilter((int) $project['id']);
        }
    }

    /**
     * Toggle turned OFF: remove every "Show all tasks" filter across all boards (reserved name).
     */
    public function removeAllShowAllFilters()
    {
        $this->db->table(CustomFilterModel::TABLE)
            ->eq('name', self::SHOW_ALL_FILTER_NAME)
            ->remove();
    }
}