<?php
/**
 * Invoice Ninja (https://invoiceninja.com).
 *
 * @link https://github.com/invoiceninja/invoiceninja source repository
 *
 * @copyright Copyright (c) 2020. Invoice Ninja LLC (https://invoiceninja.com)
 *
 * @license https://opensource.org/licenses/AAL
 */

namespace App\Models;

use App\Helpers\Invoice\InvoiceSum;
use App\Helpers\Invoice\InvoiceSumInclusive;
use App\Models\Filterable;
use App\Models\RecurringInvoiceInvitation;
use App\Services\Recurring\RecurringService;
use App\Utils\Traits\MakesDates;
use App\Utils\Traits\MakesHash;
use App\Utils\Traits\Recurring\HasRecurrence;
use Illuminate\Database\Eloquent\Model;
use Illuminate\Database\Eloquent\SoftDeletes;
use Illuminate\Support\Carbon;

/**
 * Class for Recurring Invoices.
 */
class RecurringInvoice extends BaseModel
{
    use MakesHash;
    use SoftDeletes;
    use Filterable;
    use MakesDates;
    use HasRecurrence;

    /**
     * Invoice Statuses.
     */
    const STATUS_DRAFT = 1;
    const STATUS_ACTIVE = 2;
    const STATUS_PAUSED = 3;
    const STATUS_COMPLETED = 4;
    const STATUS_PENDING = -1;

    /**
     * Recurring intervals //todo MAP WHEN WE MIGRATE.
     */

    /* Make sure we support overflow!!!!!!!!!!
    $start = Carbon::today();
    $subscription = Carbon::parse('2017-12-31');

    foreach (range(1, 12) as $month) {
        $day = $start->addMonthNoOverflow()->thisDayOrLast($subscription->day);

        echo "You will be billed on {$day} in month {$month}\n";
    }
     */

    const FREQUENCY_DAILY = 1;
    const FREQUENCY_WEEKLY = 2;
    const FREQUENCY_TWO_WEEKS = 3;
    const FREQUENCY_FOUR_WEEKS = 4;
    const FREQUENCY_MONTHLY = 5;
    const FREQUENCY_TWO_MONTHS = 6;
    const FREQUENCY_THREE_MONTHS = 7;
    const FREQUENCY_FOUR_MONTHS = 8;
    const FREQUENCY_SIX_MONTHS = 9;
    const FREQUENCY_ANNUALLY = 10;
    const FREQUENCY_TWO_YEARS = 11;
    const FREQUENCY_THREE_YEARS = 12;

    const RECURS_INDEFINITELY = -1;

    protected $fillable = [
        'client_id',
        'number',
        'discount',
        'is_amount_discount',
        'po_number',
        'date',
        'due_date',
        'due_date_days',
        'line_items',
        'settings',
        'footer',
        'public_notes',
        'private_notes',
        'terms',
        'tax_name1',
        'tax_name2',
        'tax_name3',
        'tax_rate1',
        'tax_rate2',
        'tax_rate3',
        'custom_value1',
        'custom_value2',
        'custom_value3',
        'custom_value4',
        'amount',
        'partial',
        'frequency_id',
        'next_send_date',
        'remaining_cycles',
        'auto_bill',
        'auto_bill_enabled',
    ];

    protected $casts = [
        'settings' => 'object',
        'line_items' => 'object',
        'backup' => 'object',
        'updated_at' => 'timestamp',
        'created_at' => 'timestamp',
        'deleted_at' => 'timestamp',
    ];

    protected $appends = [
        'hashed_id',
        'status',
    ];

    protected $touches = [];

    public function getEntityType()
    {
        return self::class;
    }

    public function getDateAttribute($value)
    {
        if (! empty($value)) {
            return (new Carbon($value))->format('Y-m-d');
        }

        return $value;
    }

    public function getDueDateAttribute($value)
    {
        if (! empty($value)) {
            return (new Carbon($value))->format('Y-m-d');
        }

        return $value;
    }

    public function getPartialDueDateAttribute($value)
    {
        if (! empty($value)) {
            return (new Carbon($value))->format('Y-m-d');
        }

        return $value;
    }

    public function company()
    {
        return $this->belongsTo(Company::class);
    }

    public function client()
    {
        return $this->belongsTo(Client::class)->withTrashed();
    }

    public function user()
    {
        return $this->belongsTo(User::class)->withTrashed();
    }

    public function assigned_user()
    {
        return $this->belongsTo(User::class, 'assigned_user_id', 'id')->withTrashed();
    }

    public function invoices()
    {
        return $this->hasMany(Invoice::class, 'id', 'recurring_id')->withTrashed();
    }

    public function invitations()
    {
        return $this->hasMany(RecurringInvoiceInvitation::class);
    }

    public function documents()
    {
        return $this->morphMany(Document::class, 'documentable');
    }
    
    public function getStatusAttribute()
    {
        if ($this->status_id == self::STATUS_ACTIVE && Carbon::parse($this->next_send_date)->isFuture()) 
            return self::STATUS_PENDING;
        else 
            return $this->status_id;
    }

    public function nextSendDate() :?Carbon
    {
        switch ($this->frequency_id) {
            case self::FREQUENCY_WEEKLY:
                return Carbon::parse($this->next_send_date)->addWeek();
            case self::FREQUENCY_TWO_WEEKS:
                return Carbon::parse($this->next_send_date)->addWeeks(2);
            case self::FREQUENCY_FOUR_WEEKS:
                return Carbon::parse($this->next_send_date)->addWeeks(4);
            case self::FREQUENCY_MONTHLY:
                return Carbon::parse($this->next_send_date)->addMonthNoOverflow();
            case self::FREQUENCY_TWO_MONTHS:
                return Carbon::parse($this->next_send_date)->addMonthsNoOverflow(2);
            case self::FREQUENCY_THREE_MONTHS:
                return Carbon::parse($this->next_send_date)->addMonthsNoOverflow(3);
            case self::FREQUENCY_FOUR_MONTHS:
                return Carbon::parse($this->next_send_date)->addMonthsNoOverflow(4);
            case self::FREQUENCY_SIX_MONTHS:
                return Carbon::parse($this->next_send_date)->addMonthsNoOverflow(6);
            case self::FREQUENCY_ANNUALLY:
                return Carbon::parse($this->next_send_date)->addYear();
            case self::FREQUENCY_TWO_YEARS:
                return Carbon::parse($this->next_send_date)->addYears(2);
            case self::FREQUENCY_THREE_YEARS:
                return Carbon::parse($this->next_send_date)->addYears(3);
            default:
                return null;
        }
    }

    public function nextDateByFrequency($date)
    {

        switch ($this->frequency_id) {
            case self::FREQUENCY_WEEKLY:
                return Carbon::parse($date)->addWeek();
            case self::FREQUENCY_TWO_WEEKS:
                return Carbon::parse($date)->addWeeks(2);
            case self::FREQUENCY_FOUR_WEEKS:
                return Carbon::parse($date)->addWeeks(4);
            case self::FREQUENCY_MONTHLY:
                return Carbon::parse($date)->addMonthNoOverflow();
            case self::FREQUENCY_TWO_MONTHS:
                return Carbon::parse($date)->addMonthsNoOverflow(2);
            case self::FREQUENCY_THREE_MONTHS:
                return Carbon::parse($date)->addMonthsNoOverflow(3);
            case self::FREQUENCY_FOUR_MONTHS:
                return Carbon::parse($date)->addMonthsNoOverflow(4);
            case self::FREQUENCY_SIX_MONTHS:
                return Carbon::parse($date)->addMonthsNoOverflow(6);
            case self::FREQUENCY_ANNUALLY:
                return Carbon::parse($date)->addYear();
            case self::FREQUENCY_TWO_YEARS:
                return Carbon::parse($date)->addYears(2);
            case self::FREQUENCY_THREE_YEARS:
                return Carbon::parse($date)->addYears(3);
            default:
                return null;
        }

    }

    public function remainingCycles() : int
    {
        if ($this->remaining_cycles == 0) {
            return 0;
        } 
        else if($this->remaining_cycles == -1) {
            return -1;
        }
        else {
            return $this->remaining_cycles - 1;
        }
    }

    public function setCompleted() :  void
    {
        $this->status_id = self::STATUS_COMPLETED;
        $this->next_send_date = null;
        $this->remaining_cycles = 0;
        $this->save();
    }

    public static function badgeForStatus(int $status)
    {
        switch ($status) {
            case self::STATUS_DRAFT:
                return '<h4><span class="badge badge-light">'.ctrans('texts.draft').'</span></h4>';
                break;
            case self::STATUS_PENDING:
                return '<h4><span class="badge badge-primary">'.ctrans('texts.pending').'</span></h4>';
                break;
            case self::STATUS_ACTIVE:
                return '<h4><span class="badge badge-primary">'.ctrans('texts.active').'</span></h4>';
                break;
            case self::STATUS_COMPLETED:
                return '<h4><span class="badge badge-success">'.ctrans('texts.status_completed').'</span></h4>';
                break;
            case self::STATUS_PAUSED:
                return '<h4><span class="badge badge-danger">'.ctrans('texts.paused').'</span></h4>';
                break;
            default:
                // code...
                break;
        }
    }

    public static function frequencyForKey(int $frequency_id) :string
    {
        switch ($frequency_id) {
            case self::FREQUENCY_WEEKLY:
                return ctrans('texts.freq_weekly');
                break;
            case self::FREQUENCY_TWO_WEEKS:
                return ctrans('texts.freq_two_weeks');
                break;
            case self::FREQUENCY_FOUR_WEEKS:
                return ctrans('texts.freq_four_weeks');
                break;
            case self::FREQUENCY_MONTHLY:
                return ctrans('texts.freq_monthly');
                break;
            case self::FREQUENCY_TWO_MONTHS:
                return ctrans('texts.freq_two_months');
                break;
            case self::FREQUENCY_THREE_MONTHS:
                return ctrans('texts.freq_three_months');
                break;
            case self::FREQUENCY_FOUR_MONTHS:
                return ctrans('texts.freq_four_months');
                break;
            case self::FREQUENCY_SIX_MONTHS:
                return ctrans('texts.freq_six_months');
                break;
            case self::FREQUENCY_ANNUALLY:
                return ctrans('texts.freq_annually');
                break;
            case self::FREQUENCY_TWO_YEARS:
                return ctrans('texts.freq_two_years');
                break;
            default:
                // code...
                break;
        }
    }

    public function calc()
    {
        $invoice_calc = null;

        if ($this->uses_inclusive_taxes) {
            $invoice_calc = new InvoiceSumInclusive($this);
        } else {
            $invoice_calc = new InvoiceSum($this);
        }

        return $invoice_calc->build();
    }

    /* 
     * Important to note when playing with carbon dates - in order 
     * not to modify the original instance, always use a `->copy()`
     * 
     */
    public function recurringDates()
    {

        /* Return early if nothing to send back! */        
        if( $this->status_id == self::STATUS_COMPLETED ||
            $this->status_id == self::STATUS_DRAFT ||
            $this->status_id == self::STATUS_PAUSED ||
            $this->remaining_cycles == 0 ||
            !$this->next_send_date) {

            return [];
        }

        /* Endless - lets send 10 back*/
        $iterations = $this->remaining_cycles;

        if($this->remaining_cycles == -1) 
            $iterations = 10;
            
        $next_send_date = Carbon::parse($this->next_send_date)->copy();

        $data = [];

        for($x=0; $x<$iterations; $x++)
        {
            // we don't add the days... we calc the day of the month!!
            $next_due_date = $this->calculateDueDate($next_send_date->copy()->format('Y-m-d'));

            $next_send_date = Carbon::parse($next_send_date);
            $next_due_date = Carbon::parse($next_due_date);

            $data[] = [
                'send_date' => $next_send_date->format('Y-m-d'), 
                'due_date' => $next_due_date->format('Y-m-d'),
            ];

            $next_send_date = $this->nextDateByFrequency($next_send_date->format('Y-m-d'));        

        }

        /*If no due date is set - unset the due_date value */
        if(!$this->due_date_days || $this->due_date_days == 0){
            
            foreach($data as $key => $value)
                $data[$key]['due_date'] = '';

        }

        return $data;
    
    }


    public function calculateDueDate($date) 
    {

        switch ($this->due_date_days) {
            case 'terms':
                return $this->calculateDateFromTerms($date);
                break;
            default:
                return $this->setDayOfMonth($date, $this->due_date_days);
                break;
        }
    }

    /**
     * Calculates a date based on the client payment terms.
     * 
     * @param  Carbon $date A given date
     * @return NULL|Carbon  The date
     */
    public function calculateDateFromTerms($date) 
    {
        $new_date = Carbon::parse($date);

        $client_payment_terms = $this->client->getSetting('payment_terms');

        if($client_payment_terms == '')//no due date! return null;
            return null;

        return $new_date->addDays($client_payment_terms); //add the number of days in the payment terms to the date
    }

    /**
     * Service entry points.
     */
    public function service() :RecurringService
    {
        return new RecurringService($this);
    }

}