<?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 shared, reserved-name custom filters on every board (v1.5 "Show all tasks", v1.6
 * "Due this month" / "Around this month"), each group gated by its own config toggle.
 */
class OrganonProjectHelper extends Base
{
    const EMPHASIZE_KEY = 'organon_tweaks_emphasize_duedate';
    const EMPHASIZE_DEFAULT_KEY = 'organon_tweaks_emphasize_duedate_default';

    // Config toggles for the auto-managed custom-filter groups.
    const SHOW_ALL_FILTER_KEY = 'organon_tweaks_show_all_filter';
    const MONTH_FILTERS_KEY = 'organon_tweaks_month_filters';
    const RECURRING_FILTERS_KEY = 'organon_tweaks_recurring_filters';

    // Reserved custom-filter groups: each row is [name, query, append]. The NAME is reserved by the
    // plugin (fixed, non-translated strings so dedup is stable across locales); a user's own filter
    // with a reserved name is absorbed into the canonical form. "Show all tasks" is a REPLACE filter
    // (append 0) so it clears; the rest are APPEND (1) so clicks stack (distinct attributes AND).
    const GROUP_SHOW_ALL = array(
        array('Show all tasks', '', 0),
    );
    const GROUP_MONTH = array(
        array('Due this month', 'duemonth:this', 1),
        array('Around this month', 'aroundmonth:this', 1),
    );
    const GROUP_RECURRING = array(
        array('All recurring', 'recurring:anyall', 1),
        array('Event recurring', 'recurring:evtall', 1),
        array('Calendar recurring', 'recurring:calall', 1),
        array('Recurring templates', 'recurring:anyori', 1),
        array('Recurring duplicates', 'recurring:anydup', 1),
    );

    /**
     * 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 one canonical reserved custom filter on a board (shared). Idempotent: create when
     * absent, force a same-named one back to the canonical form (query + shared + append) since the
     * name is reserved, and drop duplicates. 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
     * @param string $name
     * @param string $query
     * @param int    $append
     */
    public function ensureReservedFilter($project_id, $name, $query, $append)
    {
        $project_id = (int) $project_id;
        $user_id = (int) $this->userSession->getId();

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

        $append = $append ? 1 : 0;

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

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

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

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

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

    /**
     * Ensure every ENABLED group's filters on a board. Called lazily on each project-header render,
     * so it covers old and new boards alike.
     *
     * @param int $project_id
     */
    public function ensureBoardFilters($project_id)
    {
        if ((int) $this->configModel->get(self::SHOW_ALL_FILTER_KEY, 1) === 1) {
            $this->ensureGroup($project_id, self::GROUP_SHOW_ALL);
        }

        if ((int) $this->configModel->get(self::MONTH_FILTERS_KEY, 1) === 1) {
            $this->ensureGroup($project_id, self::GROUP_MONTH);
        }

        if ((int) $this->configModel->get(self::RECURRING_FILTERS_KEY, 1) === 1) {
            $this->ensureGroup($project_id, self::GROUP_RECURRING);
        }
    }

    private function ensureGroup($project_id, array $rows)
    {
        foreach ($rows as $row) {
            $this->ensureReservedFilter($project_id, $row[0], $row[1], $row[2]);
        }
    }

    /**
     * Toggle turned ON: eagerly (re)create a group's filters on every existing board.
     * ensureBoardFilters() keeps covering boards created afterwards.
     *
     * @param array $rows
     */
    public function addGroupToAllProjects(array $rows)
    {
        foreach ($this->projectModel->getAll() as $project) {
            $this->ensureGroup((int) $project['id'], $rows);
        }
    }

    /**
     * Toggle turned OFF: remove a group's filters across all boards (by their reserved names).
     *
     * @param array $rows
     */
    public function removeGroup(array $rows)
    {
        $names = array();

        foreach ($rows as $row) {
            $names[] = $row[0];
        }

        $this->db->table(CustomFilterModel::TABLE)->in('name', $names)->remove();
    }
}