<?php
use Carbon\Carbon;
use Watson\Validating\ValidatingTrait;
use \Illuminate\Database\Eloquent\Model as Eloquent;
/**
 * Class Bill
 */
class Bill extends Eloquent
{

    use ValidatingTrait;
    protected $rules
        = [
            'user_id'     => 'required|exists:users,id',
            'name'        => 'required|between:1,255|min:1',
            'match'       => 'required',
            'amount_max'  => 'required|between:0,65536',
            'amount_min'  => 'required|between:0,65536',
            'date'        => 'required|date',
            'active'      => 'between:0,1',
            'automatch'   => 'between:0,1',
            'repeat_freq' => 'required|in:daily,weekly,monthly,quarterly,half-year,yearly',
            'skip'        => 'required|between:0,31',];
    protected $fillable = ['user_id', 'name', 'match', 'amount_min', 'amount_max', 'date', 'repeat_freq', 'skip', 'active', 'automatch'];
    /**
     * @return array
     */
    public function getDates()
    {
        return ['created_at', 'updated_at', 'date'];
    }

    /**
     * TODO remove this method in favour of something in the FireflyIII libraries.
     *
     * @return null
     */
    public function lastFoundMatch()
    {
        $last = $this->transactionjournals()->orderBy('date', 'DESC')->first();
        if ($last) {
            return $last->date;
        }

        return null;
    }

    /**
     * @return \Illuminate\Database\Eloquent\Relations\HasMany
     */
    public function transactionjournals()
    {
        return $this->hasMany('TransactionJournal');
    }


    /**
     * TODO remove this method in favour of something in the FireflyIII libraries.
     *
     * Find the next expected match based on the set journals and the date stuff from the bill.
     */
    public function nextExpectedMatch()
    {

        /*
         * The date Firefly tries to find. If this stays null, it's "unknown".
         */
        $finalDate = null;
        if ($this->active == 0) {
            return $finalDate;
        }

        /*
         * $today is the start of the next period, to make sure FF3 won't miss anything
         * when the current period has a transaction journal.
         */
        $today = DateKit::addPeriod(new Carbon, $this->repeat_freq, 0);

        /*
         * FF3 loops from the $start of the bill, and to make sure
         * $skip works, it adds one (for modulo).
         */
        $skip  = $this->skip + 1;
        $start = DateKit::startOfPeriod(new Carbon, $this->repeat_freq);
        /*
         * go back exactly one month/week/etc because FF3 does not care about 'next'
         * bills if they're too far into the past.
         */

        $counter = 0;
        while ($start <= $today) {
            if (($counter % $skip) == 0) {
                // do something.
                $end          = DateKit::endOfPeriod(clone $start, $this->repeat_freq);
                $journalCount = $this->transactionjournals()->before($end)->after($start)->count();
                if ($journalCount == 0) {
                    $finalDate = clone $start;
                    break;
                }
            }

            // add period for next round!
            $start = DateKit::addPeriod($start, $this->repeat_freq, 0);
            $counter++;
        }

        return $finalDate;
    }

    /**
     * @return \Illuminate\Database\Eloquent\Relations\BelongsTo
     */
    public function user()
    {
        return $this->belongsTo('User');
    }
}