<?php

namespace App;

use Illuminate\Database\Eloquent\Model;
use Carbon\Carbon;

use App\MemberState;
use App\PersonTarget;

class Person extends Model
{
    /**************************************************************************
     * MEMBER STATE FUNCTIONS                                                 *
     **************************************************************************/

    /*
     * Return true, if the person is active member, return false otherwise.
     *
     * @return boolean
     */
    public function isMember()
    {
        $latest = $this->memberStates->last();
        if (is_null($latest)) {
            return false;
        } else {
            return is_null($latest['leaving_date']);
        }
    }

    /*
     * Returns true, if the person was active member at some time in the past.
     * Note, that this function also returns true, if the person is still an
     * active member.
     *
     * @return boolean
     */
    public function wasMember()
    {
        return !($this->memberStates->isEmpty());
    }

    /*
     * Return a collection of all persons which are active members.
     *
     * @return Illuminate\Database\Eloquent\Collection
     */
    public static function active()
    {
        return Person::whereHas('memberStates', function($memberState) {
            $memberState->where('leaving_date', '=', null);
        })->get();
    }

    /*
     * Return the last date since when the person is an active member.
     *
     * @return Carbon\Carbon
     */
    public function activeSince()
    {
        $latest = $this->memberStates
                       ->orderBy('joining_date', 'desc')
                       ->first();

        return Carbon::parse($latest['joining_date']);
    }

    /*
     * Returns the active time of the person until now in years.
     *
     * @return float
     */
    public function activeTime()
    {
        $activeTimes = $this->memberStates;

        $diff = 0;

        foreach ($activeTimes as $period) {
            $start = Carbon::parse($period['joining_date']);
            $end = is_null($period['leaving_date']) ?
                   Carbon::now() :
                   Carbon::parse($period['leaving_date']);

            $diffYears = Carbon::parse($start)->diffInYears($end);
            $diffDays = Carbon::parse($start)->diffInDays($end);

            $diff += $diffYears + $diffDays / 365 - $diffYears;
        }

        return $diff;
    }

    /*
     * Get all member state records associated with a person.
     *
     * @return Illuminate\Database\Eloquent\Relations\HasMany
     */
    public function memberStates()
    {
        return $this->hasMany('\App\MemberState')->orderBy('joining_date');
    }

    /**************************************************************************
     * PERSON TARGET FUNCTIONS                                                *
     **************************************************************************/

    /*
     * Get all targets associated with a person.
     *
     * @return Illuminate\Database\Eloquent\Relations\HasMany
     */
    public function targets()
    {
        return $this->hasMany('\App\PersonTarget')->orderBy('date');
    }

    /*
     * Get all actuals associated with a person.
     *
     * @return Illuminate\Database\Eloquent\Relations\HasManyThrough
     */
    public function actuals()
    {
        return $this->hasManyThrough('\App\SubBooking', '\App\PersonTarget');
    }

    /*
     * Get the full name of the person.
     *
     * @return string
     */
    public function fullName()
    {
        if ($this->title == 'Firma') {
            return $this->name_or_company;
        } else {
            return $this->surname . ' ' . $this->name_or_company;
        }
    }
}