<?php

namespace Kanboard\Plugin\OrganonTweaks\Helper;

use Kanboard\Core\Base;
use Kanboard\Model\SubtaskModel;

/**
 * Done/Todo badge helper.
 *
 * "Done" has a single source of truth PER MODE (no drift with native Close/Open):
 *   - close-mode on  ("check done also closes tasks"): Done == the task is CLOSED (is_active == 0).
 *     The badge reads the task's own is_active, so however a task is closed/reopened (badge, native
 *     sidebar, bulk, API) the badge always matches. No metadata is stored in this mode.
 *   - close-mode off (marker only): Done == the task metadata DONE_KEY == 'on', independent of the
 *     open/closed status. Stored as the non-falsy string 'on' (never '0'/'1'): MetadataModel::get()
 *     uses `?:` and PHP treats "0" as falsy, so a stored "0" would read back as the default.
 *
 * Templates cannot read models directly, so the board/task-view badge templates call isDone() here,
 * passing the task array (which carries both id and is_active) so the close-mode read needs no query.
 */
class OrganonDoneHelper extends Base
{
    const DONE_KEY = 'organon_done';
    const CLOSES_KEY = 'organon_tweaks_done_closes_task';
    const AUTOSUB_KEY = 'organon_tweaks_done_autosubtasks';
    const ALLDONE_KEY = 'organon_subtasks_alldone';

    /**
     * Is this task Done? (mode-aware: closed status in close-mode, else the metadata marker)
     *
     * @param  array $task  a task array carrying 'id' and 'is_active'
     * @return bool
     */
    public function isDone(array $task)
    {
        if ($this->closesTask()) {
            return isset($task['is_active']) && (int) $task['is_active'] === 0;
        }

        return $this->taskMetadataModel->get((int) $task['id'], self::DONE_KEY, '') === 'on';
    }

    /**
     * Should toggling Done also close (and reopen) the task? Global setting, default off.
     *
     * @return bool
     */
    public function closesTask()
    {
        return (int) $this->configModel->get(self::CLOSES_KEY, 0) === 1;
    }

    /**
     * Mark a task Done in the current mode. Idempotent -- a no-op if it is already Done. Close-mode
     * closes the task; marker-mode sets the DONE_KEY metadata.
     *
     * @param int $task_id
     */
    public function markDone($task_id)
    {
        $task = $this->taskFinderModel->getById((int) $task_id);

        if (empty($task) || $this->isDone($task)) {
            return;
        }

        if ($this->closesTask()) {
            $this->taskStatusModel->close((int) $task_id);
        } else {
            $this->taskMetadataModel->save((int) $task_id, array(self::DONE_KEY => 'on'));
        }
    }

    /**
     * Recompute whether the task's subtasks are ALL done and, only on the up-transition
     * (was-not-all-done -> now-all-done), auto-mark the task Done. The last-seen all-done state is kept
     * in ALLDONE_KEY ('on'/'off') to detect that edge -- so a manual unmark is honored (nothing
     * re-fires) and title edits / refreshes never re-mark. Never auto-unmarks.
     *
     * @param int $task_id
     * @param int $exclude_id  a subtask id to exclude from the counts (the row being deleted --
     *                         EVENT_DELETE fires BEFORE the row is removed, so it still counts)
     */
    public function syncSubtasksDone($task_id, $exclude_id = 0)
    {
        $task_id = (int) $task_id;
        $exclude_id = (int) $exclude_id;

        $totalQuery = $this->db->table(SubtaskModel::TABLE)->eq('task_id', $task_id);
        $doneQuery = $this->db->table(SubtaskModel::TABLE)->eq('task_id', $task_id)->eq('status', SubtaskModel::STATUS_DONE);

        if ($exclude_id > 0) {
            $totalQuery->neq('id', $exclude_id);
            $doneQuery->neq('id', $exclude_id);
        }

        $total = $totalQuery->count();
        $done = $doneQuery->count();
        $allDone = $total > 0 && $done === $total;
        $prev = $this->taskMetadataModel->get($task_id, self::ALLDONE_KEY, 'off') === 'on';

        // Save the new state BEFORE marking: in close-mode markDone() -> close() -> closeAll() re-fires
        // subtask events into this method; with the marker already 'on', that re-entry sees no
        // transition and is a no-op (no loop).
        $this->taskMetadataModel->save($task_id, array(self::ALLDONE_KEY => $allDone ? 'on' : 'off'));

        if ($allDone && ! $prev) {
            $this->markDone($task_id);
        }
    }
}