<?php

namespace Bluesquare\Pilot\Entity;

abstract class Metric extends Widget
{
    /**
     * @var bool|int $cache Cache duration (in seconds) or FALSE to disable caching
     */
    protected $cache = false;

    protected $data = null;

    abstract public function compute($entry = null);

    public function handle($data)
    {
        $this->data = $data;

        $cache_key = 'pilot-metric-'.$this->slug.'-'.json_encode($data);

        if ($this->cache !== false && cache()->has($cache_key)) {
            $computed = cache()->get($cache_key);
        }
        else {
            $computed = $this->compute(
                $data['entry'] ?? null
            );

            if ($this->cache !== false) {
                cache()->put($cache_key, $computed, $this->cache);
            }
        }

        return $this->output($computed);
    }

    public function output($data)
    {
        return [
            'json' => [
                'metric' => $data
            ]
        ];
    }

    protected function resolveFilter($filters)
    {
        $filter = collect($filters)->firstWhere('value', $this->data['filter'] ?? null) ?? collect($filters)->first();

        $computed = is_array($filter) ? $filter['callback']() : [];

        return [
            'filter' => $filter['value'],
            'filters' => collect($filters)->map(function ($filter) {
                return [
                    'label' => $filter['label'],
                    'value' => $filter['value'],
                ];
            })->values()->all(),
            ...$computed
        ];
    }

    public function filter(string $label, $value, callable $callback)
    {
        return ['label' => $label, 'value' => $value, 'callback' => $callback];
    }

    public function filters(array $filters)
    {
        return $this->resolveFilter($filters);
    }

    public function progress($current, $target)
    {
        return [
            'type' => 'progress',
            'value' => $current,
            'target' => $target,
        ];
    }

    public function trend(array $values)
    {
        return [
            'type' => 'trend',
            'values' => $values,
        ];
    }

    public function partition(array $values)
    {
        return [
            'type' => 'partition',
            'values' => $values,
        ];
    }

    public function value($value, $previous = null)
    {
        return [
            'type' => 'value',
            'value' => $value,
            'previous' => $previous,
        ];
    }

    public function monitor(bool $available)
    {
        return [
            'type' => 'monitor',
            'value' => $available,
        ];
    }
}