<?php
namespace Base\Task;

/**
 * 任务处理
 * @author elf<360197197@qq.com>
 */
class Task
{
    public static $types = [
        'market-shift' => '\Base\Task\MarketShiftTask',
    ];

    public $type;
    public $tasks;

    public function __construct($type = null)
    {
        $this->type = $type;
    }

    public function run($count = 1)
    {
        $map = ['status' => 0];
        if ($this->type !== null) {
            $map['type'] = $this->type;
        }
        $this->tasks = M('tasks', 'tab_')->where($map)->limit($count)->select();
        if (count($this->tasks) == 0) {
            throw new \Exception('暂无任务');
        }

        $this->updateTasks(['status' => 1, 'start_time' => time()]);

        foreach ($this->tasks as $task) {
            $class = $this->getTypeClass($task);
            if (is_null($class) || !class_exists($class)) {
                $this->updateTask($task, ['status' => 3, 'end_time' => time(), 'result' => '任务处理类不存在']);
                continue;
            }
            try {
                $params = json_decode($task['params'], true);
                $obj = new $class($params);
                $obj->run();
                $this->updateTask($task, ['status' => 2, 'end_time' => time(), 'result' => '处理成功']);
            } catch (\Exception $e) {
                $this->updateTask($task, ['status' => 3, 'end_time' => time(), 'result' => $e->getMessage()]);
            }
        }
    }

    public function getTypeClass($task)
    {
        if (!isset(self::$types[$task['type']])) {
            return null;
        }
        return self::$types[$task['type']];
    }

    private function updateTask($task, $data)
    {
        M('tasks', 'tab_')->where(['id' => $task['id']])->save($data);
    }

    private function updateTasks($data)
    {
        $ids = array_column($this->tasks, 'id');
        M('tasks', 'tab_')->where(['id' => ['in', $ids]])->save($data);
    }

    public static function add($type, $params = [])
    {
        if (!isset(self::$types[$type])) {
            return false;
        }
        $record = [
            'type' => $type,
            'params' => json_encode($params),
            'created_time' => time()
        ];
        return M('tasks', 'tab_')->add($record);
    }
}