<?php

namespace App\Models;

use App\Models\AiChat;
use Carbon\CarbonPeriod;
use Illuminate\Support\Arr;
use Illuminate\Support\Carbon;
use Illuminate\Support\Facades\DB;
use Illuminate\Database\Eloquent\Model;
use App\Interfaces\MarketData\MarketDataInterface;
use Illuminate\Database\Eloquent\Concerns\HasUuids;
use Illuminate\Database\Eloquent\Factories\HasFactory;

class Portfolio extends Model
{
    use HasFactory;
    use HasUuids;

    protected $fillable = [
        'title',
        'notes',
        'wishlist',
    ];

    public static ?string $owner_id = null;

    protected static function boot()
    {
        parent::boot();
        
        static::saved(function ($portfolio) {

            self::ensurePortfolioHasOwner($portfolio);
        });
    }

    protected $hidden = [];

    protected $casts = [
        'wishlist' => 'boolean'
    ];

    protected $with = ['users', 'transactions'];

    public function users()
    {
        return $this->belongsToMany(User::class)->withPivot(['owner', 'full_access', 'invite_accepted_at']);
    }

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

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

    public function daily_change()
    {
        return $this->hasMany(DailyChange::class);
    }

    /**
     * Related chats for portfolio
     *
     * @return void
     */
    public function chats()
    {
        return $this->morphMany(AiChat::class, 'chatable')->where('user_id', auth()->user()->id);
    }

    public function scopeMyPortfolios() 
    {
        return $this->whereHas('users', function ($query) {
            $query->where('user_id', auth()->user()->id);
        });
    }

    public function scopeFullAccess($query, $user_id = null) 
    {
        return $query->whereHas('users', function ($query) use ($user_id) {
            $query->where('user_id', $user_id ?? auth()->user()->id)
                  ->where(function ($query) {
                      $query->where('full_access', true)
                            ->orWhere('owner', true);
                  });
        });
    }

    public function scopeWithoutWishlists() 
    {
        return $this->where(['wishlist' => false]);
    }

    public function setOwnerIdAttribute($value)
    {
        // enable queued jobs to create portfolios with owners
        if (!auth()->user()?->id && !$this->owner_id) {
            static::$owner_id = $value;
        }
    }

    public function getOwnerIdAttribute()
    {
        return $this->owner?->id;
    }

    public function getOwnerAttribute()
    {
        if (!$this->relationLoaded('user')) {
            
            $this->load('users');
        }

        return $this->users->where('pivot.owner', true)->first();
    }

    public static function ensurePortfolioHasOwner(self $portfolio) 
    {
        // make sure we don't remove owner access
        if (!$portfolio->owner_id) {
            $owner[static::$owner_id ?? auth()->user()->id] = ['owner' => true];

            // save
            $portfolio->users()->sync($owner);
        }
    }

    public function syncDailyChanges(): void
    {
        $holdings = $this->holdings()
                ->join('transactions', function($join) {
                    $join->on('transactions.symbol', '=', 'holdings.symbol')
                         ->where('transactions.portfolio_id', '=', $this->id); 
                })
                ->select('holdings.symbol', 'holdings.portfolio_id', DB::raw('min(transactions.date) as first_transaction_date')) // get first transaction date
                ->groupBy(['holdings.symbol', 'holdings.portfolio_id']) 
                ->get();

        $dividends = Dividend::whereIn('symbol', $holdings->pluck('symbol'))->get();
        
        $total_performance = [];

        $holdings->each(function($holding) use (&$total_performance, $dividends) {

            $period = CarbonPeriod::create(
                $holding->first_transaction_date, 
                now()->isBefore(Carbon::parse(config('investbrain.daily_change_time_of_day'))) 
                    ? now()->subDay() 
                    : now()
            );

            $holding->setRelation('dividends', $dividends->where('symbol', $holding->symbol));

            $daily_performance = $holding->dailyPerformance($holding->first_transaction_date, now());
            $dividends = $holding->dividends->keyBy(function ($dividend, $key) {
                return $dividend['date']->format('Y-m-d');
            });
            $all_history = app(MarketDataInterface::class)->history($holding->symbol, $holding->first_transaction_date, now());

            $dividends_earned = 0;
            $holding_performance = [];

            foreach($period as $date) {
                $date = $date->format('Y-m-d');

                $close = $this->getMostRecentCloseData($all_history, $date);
                
                $total_market_value = $daily_performance->get($date)->owned * $close;
                $dividends_earned += $daily_performance->get($date)->owned * ($dividends->get($date)?->dividend_amount ?? 0);

                if (Carbon::parse($date)->isWeekday()) {
                    $holding_performance[$date] = [
                        'date' => $date,
                        'portfolio_id' => $this->id,
                        'total_market_value' => $total_market_value, 
                        'total_cost_basis' => $daily_performance->get($date)->cost_basis,
                        'total_gain' => $total_market_value - $daily_performance->get($date)->cost_basis,
                        'realized_gains' => $daily_performance->get($date)->realized_gains,
                        'total_dividends_earned' => $dividends_earned
                    ];
                }
            }

            foreach ($holding_performance as $date => $performance) {
                if (Arr::get($total_performance, $date) == null) {
                    
                    $total_performance[$date] = $performance;

                } else {

                    $total_performance[$date]['total_market_value'] += $performance['total_market_value'];
                    $total_performance[$date]['total_cost_basis'] += $performance['total_cost_basis'];
                    $total_performance[$date]['total_gain'] += $performance['total_gain'];
                    $total_performance[$date]['realized_gains'] += $performance['realized_gains'];
                    $total_performance[$date]['total_dividends_earned'] += $performance['total_dividends_earned'];
                }
            }
        });

        if (!empty($total_performance)) {
            DB::transaction(function () use ($total_performance) {
                
                $this->daily_change()->upsert(
                    $total_performance,
                    ['date', 'portfolio_id'],
                    [
                        'total_market_value',
                        'total_cost_basis',
                        'total_gain',
                        'realized_gains',
                        'total_dividends_earned'
                    ]
                );
            });
        }
    }

    protected function getMostRecentCloseData($history, $date, $i = 0, $max_attempts = 5)
    {
        $close = Arr::get($history, "$date.close", 0);

        if (!$close && $i < $max_attempts) {

            $i++;
    
            $date = Carbon::parse($date)->subDay()->format('Y-m-d');

            return $this->getMostRecentCloseData($history, $date, $i);
        }

        return $close;
    }

    public function getFormattedHoldings()
    {
        $formattedHoldings = '';
        foreach($this->holdings as $holding) {
            $formattedHoldings .= " * Holding of ".$holding->market_data->name." (".$holding->symbol.")" 
                                    ."; with ". ($holding->quantity > 0 ? $holding->quantity : 'ZERO') . " shares"
                                    ."; avg cost basis ". $holding->average_cost_basis
                                    ."; curr market value ". $holding->market_data->market_value 
                                    ."; unrealized gains ". $holding->market_gain_dollars 
                                    ."; realized gains ". $holding->realized_gain_dollars
                                    ."; dividends earned ". $holding->dividends_earned
                                    ."\n\n";
        }
        return $formattedHoldings;
    }
}