investbrain/app/Models/Dividend.php

<?php

namespace App\Models;

use App\Models\Holding;
use App\Models\MarketData;
use App\Models\Transaction;
use Illuminate\Support\Str;
use Illuminate\Support\Carbon;
use Illuminate\Database\Eloquent\Model;
use App\Interfaces\MarketData\MarketDataInterface;
use Illuminate\Database\Eloquent\Concerns\HasUuids;
use Illuminate\Database\Eloquent\Factories\HasFactory;

class Dividend extends Model
{
    use HasFactory;
    use HasUuids;

    protected $fillable = [
        'symbol',
        'date',
        'dividend_amount',
    ];

    protected $hidden = [];

    protected $casts = [
        'date' => 'datetime',
        'last_date' => 'datetime',
    ];

    public function marketData() {
        return $this->belongsTo(MarketData::class, 'symbol', 'symbol');
    }

    public function holdings() {
        return $this->hasMany(Holding::class, 'symbol', 'symbol');
    }

    public function transactions() {
        return $this->hasMany(Transaction::class, 'symbol', 'symbol');
    }

    public function scopeSymbol($query, $symbol)
    {
        return $query->where('dividends.symbol', $symbol);
    }

    /**
     * Grab new dividend data
     *
     * @param string $symbol
     * @return void
     */
    public static function refreshDividendData(string $symbol) 
    {
        $dividends_meta = self::where(['symbol' => $symbol])
            ->selectRaw('COUNT(symbol) as total_dividends')
            ->selectRaw('MAX(date) as last_date')
            ->get()
            ->first();

        // assume we need to populate ALL dividend data
        $start_date = new \DateTime('@0');
        $end_date = now();

        // nope, refresh forward looking only
        if ( $dividends_meta->total_dividends ) {

            $start_date = $dividends_meta->last_date->addHours(48);
        }

        // get some data
        if ($dividend_data = collect() && $start_date && $end_date) {
            $dividend_data = app(MarketDataInterface::class)->dividends($symbol, $start_date, $end_date);
        }

        // ah, we found some dividends...
        if ($dividend_data->isNotEmpty()) {
            // create mass insert
            foreach ($dividend_data as $index => $dividend){
                $dividend_data[$index] = [...$dividend, ...['id' => Str::uuid()->toString(), 'updated_at' => now(), 'created_at' => now()]];
            }

            // insert records
            (new self)->insert($dividend_data->toArray());

            // sync to holdings
            self::syncHoldings($symbol);

            // get market data
            $market_data = MarketData::firstOrNew(['symbol' => $symbol]);

            // re-invest dividends
            self::reinvestDividends($dividend_data, $market_data);

            // sync last dividend amount to market data table
            $market_data->last_dividend_amount = $dividend_data->sortByDesc('date')->first()['dividend_amount'];
            $market_data->save();
        }

        return $dividend_data;
    }

    public static function syncHoldings(string $symbol): void
    {
        // group by holdings
        $dividends = self::select(['holdings.portfolio_id', 'dividends.date', 'dividends.symbol', 'dividends.dividend_amount'])
                        ->selectRaw('
                            (COALESCE(CASE WHEN transactions.transaction_type = "BUY" 
                                AND date(transactions.date) <= date(dividends.date) 
                                THEN transactions.quantity ELSE 0 END, 0)
                            - COALESCE(CASE WHEN transactions.transaction_type = "SELL" 
                                AND date(transactions.date) <= date(dividends.date) 
                                THEN transactions.quantity ELSE 0 END, 0))
                            * dividends.dividend_amount
                                AS total_received
                        ')
                        ->join('transactions', 'transactions.symbol', '=', 'dividends.symbol')
                        ->join('holdings', 'transactions.portfolio_id', '=', 'holdings.portfolio_id')
                        ->where('dividends.symbol', $symbol)
                        ->groupBy('holdings.portfolio_id', 'dividends.date', 'dividends.symbol', 'dividends.dividend_amount', 'total_received')
                        ->havingRaw('total_received > 0')
                        ->get();

        // iterate through holdings and update 
        Holding::where(['symbol' => $symbol])
                ->get()
                ->each(function ($holding) use ($dividends) {
                    $holding->update([
                        'dividends_earned' => $dividends->where('portfolio_id', $holding->portfolio_id)
                                                        ->sum('total_received')
                    ]);
                });
    }

    public static function reinvestDividends(iterable $dividend_data, MarketData $market_data): void
    {
        // re-invest dividends
        Holding::where([
            'symbol' => $market_data->symbol,
            'reinvest_dividends' => true,
        ])
        ->get()
        ->each(function($holding) use ($dividend_data, $market_data) {

            foreach($dividend_data as $dividend) {

                Transaction::create([
                    'date' => $dividend['date'],
                    'portfolio_id' => $holding->portfolio_id,
                    'symbol' => $holding->symbol,
                    'transaction_type' => "BUY",
                    'reinvested_dividend' => true,
                    'cost_basis' => 0,
                    'quantity' => ($dividend['dividend_amount'] * $holding->qtyOwned(Carbon::parse($dividend['date']))) / $market_data->market_value,
                ]);
            }
        });
    }
}